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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.awt.Component

All known Subclasses:   java.awt.TextComponent,  java.awt.Canvas,  java.awt.Choice,  java.awt.Scrollbar,  java.awt.Button,  java.awt.Label,  java.awt.Container,  java.awt.Checkbox,  java.awt.List,
Component
abstract public class Component implements ImageObserver,MenuContainer,Serializable(Code)
A component is an object having a graphical representation that can be displayed on the screen and that can interact with the user. Examples of components are the buttons, checkboxes, and scrollbars of a typical graphical user interface.

The Component class is the abstract superclass of the nonmenu-related Abstract Window Toolkit components. Class Component can also be extended directly to create a lightweight component. A lightweight component is a component that is not associated with a native opaque window.

Serialization

It is important to note that only AWT listeners which conform to the Serializable protocol will be saved when the object is stored. If an AWT object has listeners that aren't marked serializable, they will be dropped at writeObject time. Developers will need, as always, to consider the implications of making an object serializable. One situation to watch out for is this:
 import java.awt.*;
 import java.awt.event.*;
 import java.io.Serializable;
 class MyApp implements ActionListener, Serializable
 {
 BigObjectThatShouldNotBeSerializedWithAButton bigOne;
 Button aButton = new Button();
 MyApp()
 {
 // Oops, now aButton has a listener with a reference
 // to bigOne!
 aButton.addActionListener(this);
 }
 public void actionPerformed(ActionEvent e)
 {
 System.out.println("Hello There");
 }
 }
 
In this example, serializing aButton by itself will cause MyApp and everything it refers to to be serialized as well. The problem is that the listener is serializable by coincidence, not by design. To separate the decisions about MyApp and the ActionListener being serializable one can use a nested class, as in the following example:
 import java.awt.*;
 import java.awt.event.*;
 import java.io.Serializable;
 class MyApp java.io.Serializable
 {
 BigObjectThatShouldNotBeSerializedWithAButton bigOne;
 Button aButton = new Button();
 static class MyActionListener implements ActionListener
 {
 public void actionPerformed(ActionEvent e)
 {
 System.out.println("Hello There");
 }
 }
 MyApp()
 {
 aButton.addActionListener(new MyActionListener());
 }
 }
 

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.

For details on the focus subsystem, see How to Use the Focus Subsystem, a section in The Java Tutorial, and the Focus Specification for more information.
version:
   1.442, 06/25/07
author:
   Arthur van Hoff
author:
   Sami Shaio


Inner Class :static class AWTTreeLock
Inner Class :public enum BaselineResizeBehavior
Inner Class :protected class FlipBufferStrategy extends BufferStrategy
Inner Class :protected class BltBufferStrategy extends BufferStrategy
Inner Class :final class NativeInLightFixer implements ComponentListener,ContainerListener
Inner Class :abstract protected class AccessibleAWTComponent extends AccessibleContext implements Serializable,AccessibleComponent

Field Summary
final public static  floatBOTTOM_ALIGNMENT
     Ease-of-use constant for getAlignmentY.
final public static  floatCENTER_ALIGNMENT
     Ease-of-use constant for getAlignmentY and getAlignmentX.
final public static  floatLEFT_ALIGNMENT
     Ease-of-use constant for getAlignmentX.
final static  ObjectLOCK
     The locking object for AWT component-tree and layout operations.
final public static  floatRIGHT_ALIGNMENT
     Ease-of-use constant for getAlignmentX.
final public static  floatTOP_ALIGNMENT
     Ease-of-use constant for getAlignmentY().
 AccessibleContextaccessibleContext
    
final static  StringactionListenerK
    
final static  StringadjustmentListenerK
    
transient  AppContextappContext
     The AppContext of the component.
 Colorbackground
     The background color for this component.
transient  BufferStrategybufferStrategy
     A reference to a BufferStrategy object used to manipulate the buffers on this component.
transient  ComponentListenercomponentListener
    
final static  StringcomponentListenerK
    
transient  ComponentOrientationcomponentOrientation
     The orientation for this component.
final static  StringcontainerListenerK
    
 Cursorcursor
     The cursor displayed when pointer is over this component.
 DropTargetdropTarget
     The DropTarget associated with this component.
 booleanenabled
     True when the object is enabled.
transient  EventQueueItem[]eventCache
    
 longeventMask
     The eventMask is ONLY set by subclasses via enableEvents.
transient  FocusListenerfocusListener
    
final static  StringfocusListenerK
    
 Set[]focusTraversalKeys
     The focus traversal keys.
 Fontfont
     The font used by this component.
 Colorforeground
     The foreground color for this component.
transient  GraphicsConfigurationgraphicsConfig
     A reference to a GraphicsConfiguration object used to describe the characteristics of a graphics destination.
 intheight
     The height of the component.
transient  HierarchyBoundsListenerhierarchyBoundsListener
    
final static  StringhierarchyBoundsListenerK
    
transient  HierarchyListenerhierarchyListener
    
final static  StringhierarchyListenerK
    
 booleanignoreRepaint
     True when the object should ignore all repaint events.
static  intincRate
    
transient  InputMethodListenerinputMethodListener
    
final static  StringinputMethodListenerK
    
static  booleanisInc
     Static properties for incremental drawing.
 booleanisPacked
    
final static  StringitemListenerK
    
transient  KeyListenerkeyListener
    
final static  StringkeyListenerK
    
 Localelocale
     The locale for the component.
 DimensionmaxSize
    
 booleanmaxSizeSet
     Whether or not setMaximumSize has been invoked with a non-null value.
 DimensionminSize
     Minimum size.
 booleanminSizeSet
     Whether or not setMinimumSize has been invoked with a non-null value.
transient  MouseListenermouseListener
    
final static  StringmouseListenerK
    
transient  MouseMotionListenermouseMotionListener
    
final static  StringmouseMotionListenerK
    
transient  MouseWheelListenermouseWheelListener
    
final static  StringmouseWheelListenerK
    
transient  NativeInLightFixernativeInLightFixer
    
 booleannewEventsOnly
     newEventsOnly will be true if the event is one of the event types enabled for the component. It will then allow for normal processing to continue.
final static  StringownedWindowK
    
transient  Containerparent
     The parent of the object.
transient  ComponentPeerpeer
     The peer of the component.
 FontpeerFont
     The font which the peer is currently using.
 Vectorpopups
    
 DimensionprefSize
     Preferred size.
 booleanprefSizeSet
     Whether or not setPreferredSize has been invoked with a non-null value.
final static  StringtextListenerK
    
volatile  booleanvalid
     True when the object is valid.
 booleanvisible
     True when the object is visible.
 intwidth
     The width of the component.
transient  RuntimeExceptionwindowClosingException
    
final static  StringwindowFocusListenerK
    
final static  StringwindowListenerK
    
final static  StringwindowStateListenerK
    
 intx
     The x position of the component in the parent's coordinate system.
 inty
     The y position of the component in the parent's coordinate system.

Constructor Summary
protected  Component()
     Constructs a new component.

Method Summary
public  booleanaction(Event evt, Object what)
    
public  voidadd(PopupMenu popup)
     Adds the specified popup menu to the component.
public synchronized  voidaddComponentListener(ComponentListener l)
     Adds the specified component listener to receive component events from this component.
public synchronized  voidaddFocusListener(FocusListener l)
     Adds the specified focus listener to receive focus events from this component when this component gains input focus.
public  voidaddHierarchyBoundsListener(HierarchyBoundsListener l)
     Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes.
public  voidaddHierarchyListener(HierarchyListener l)
     Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes.
public synchronized  voidaddInputMethodListener(InputMethodListener l)
     Adds the specified input method listener to receive input method events from this component.
public synchronized  voidaddKeyListener(KeyListener l)
     Adds the specified key listener to receive key events from this component.
public synchronized  voidaddMouseListener(MouseListener l)
     Adds the specified mouse listener to receive mouse events from this component.
public synchronized  voidaddMouseMotionListener(MouseMotionListener l)
     Adds the specified mouse motion listener to receive mouse motion events from this component.
public synchronized  voidaddMouseWheelListener(MouseWheelListener l)
     Adds the specified mouse wheel listener to receive mouse wheel events from this component.
public  voidaddNotify()
     Makes this Component displayable by connecting it to a native screen resource.
public synchronized  voidaddPropertyChangeListener(PropertyChangeListener listener)
     Adds a PropertyChangeListener to the listener list.
public synchronized  voidaddPropertyChangeListener(String propertyName, PropertyChangeListener listener)
     Adds a PropertyChangeListener to the listener list for a specific property.
 voidadjustListeningChildrenOnParent(long mask, int num)
    
public  voidapplyComponentOrientation(ComponentOrientation orientation)
     Sets the ComponentOrientation property of this component and all components contained within it.
public  booleanareFocusTraversalKeysSet(int id)
     Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Component.
 booleanareInputMethodsEnabled()
    
 voidautoProcessMouseWheel(MouseWheelEvent e)
    
public  Rectanglebounds()
    
final  booleancanBeFocusOwner()
    
 voidcheckGD(String stringID)
     Checks that this component's GraphicsDevice idString matches the string argument.
public  intcheckImage(Image image, ImageObserver observer)
     Returns the status of the construction of a screen representation of the specified image.

This method does not cause the image to begin loading.

public  intcheckImage(Image image, int width, int height, ImageObserver observer)
     Returns the status of the construction of a screen representation of the specified image.

This method does not cause the image to begin loading.

 booleancheckWindowClosingException()
    
 voidclearCurrentFocusCycleRootOnHide()
    
 voidclearMostRecentFocusOwnerOnHide()
    
protected  AWTEventcoalesceEvents(AWTEvent existingEvent, AWTEvent newEvent)
     Potentially coalesce an event being posted with an existing event.
 StringconstructComponentName()
     Constructs a name for this component.
public  booleancontains(int x, int y)
     Checks whether this component "contains" the specified point, where x and y are defined to be relative to the coordinate system of this component.
public  booleancontains(Point p)
     Checks whether this component "contains" the specified point, where the point's x and y coordinates are defined to be relative to the coordinate system of this component.
 booleancontainsFocus()
    
 intcountHierarchyMembers()
    
 voidcreateBufferStrategy(int numBuffers)
     Creates a new strategy for multi-buffering on this component. Multi-buffering is useful for rendering performance.
 voidcreateBufferStrategy(int numBuffers, BufferCapabilities caps)
     Creates a new strategy for multi-buffering on this component with the required buffer capabilities.
 intcreateHierarchyEvents(int id, Component changed, Container changedParent, long changeFlags, boolean enabledOnToolkit)
    
public  ImagecreateImage(ImageProducer producer)
     Creates an image from the specified image producer.
public  ImagecreateImage(int width, int height)
     Creates an off-screen drawable image to be used for double buffering.
Parameters:
  width - the specified width
Parameters:
  height - the specified height an off-screen drawable image, which can be used for doublebuffering.
public  VolatileImagecreateVolatileImage(int width, int height)
     Creates a volatile off-screen drawable image to be used for double buffering.
Parameters:
  width - the specified width.
Parameters:
  height - the specified height.
public  VolatileImagecreateVolatileImage(int width, int height, ImageCapabilities caps)
     Creates a volatile off-screen drawable image, with the given capabilities.
public  voiddeliverEvent(Event e)
    
public  voiddisable()
    
final protected  voiddisableEvents(long eventsToDisable)
     Disables the events defined by the specified event mask parameter from being delivered to this component.
final public  voiddispatchEvent(AWTEvent e)
     Dispatches an event to this component or one of its sub components.
 voiddispatchEventImpl(AWTEvent e)
    
 booleandispatchMouseWheelToAncestor(MouseWheelEvent e)
    
public  voiddoLayout()
     Prompts the layout manager to lay out this component.
public  voidenable()
    
public  voidenable(boolean b)
    
final protected  voidenableEvents(long eventsToEnable)
     Enables the events defined by the specified event mask parameter to be delivered to this component.
public  voidenableInputMethods(boolean enable)
     Enables or disables input method support for this component.
 booleaneventEnabled(AWTEvent e)
    
 booleaneventTypeEnabled(int type)
    
 ComponentfindUnderMouseInWindow(PointerInfo pi)
     Assuming that mouse location is stored in PointerInfo passed to this method, it finds a Component that is in the same Window as this Component and is located under the mouse pointer.
protected  voidfirePropertyChange(String propertyName, Object oldValue, Object newValue)
     Support for reporting bound property changes for Object properties.
protected  voidfirePropertyChange(String propertyName, boolean oldValue, boolean newValue)
     Support for reporting bound property changes for boolean properties.
protected  voidfirePropertyChange(String propertyName, int oldValue, int newValue)
     Support for reporting bound property changes for integer properties.
public  voidfirePropertyChange(String propertyName, byte oldValue, byte newValue)
     Reports a bound property change.
public  voidfirePropertyChange(String propertyName, char oldValue, char newValue)
     Reports a bound property change.
public  voidfirePropertyChange(String propertyName, short oldValue, short newValue)
     Reports a bound property change.
public  voidfirePropertyChange(String propertyName, long oldValue, long newValue)
     Reports a bound property change.
public  voidfirePropertyChange(String propertyName, float oldValue, float newValue)
     Reports a bound property change.
public  voidfirePropertyChange(String propertyName, double oldValue, double newValue)
     Reports a bound property change.
public  AccessibleContextgetAccessibleContext()
     Gets the AccessibleContext associated with this Component. The method implemented by this base class returns null.
 intgetAccessibleIndexInParent()
     Gets the index of this object in its accessible parent.
 AccessibleStateSetgetAccessibleStateSet()
     Gets the current state set of this object.
public  floatgetAlignmentX()
     Returns the alignment along the x axis.
public  floatgetAlignmentY()
     Returns the alignment along the y axis.
 ImagegetBackBuffer()
     the back buffer currently used by this component's BufferStrategy.
public  ColorgetBackground()
     Gets the background color of this component.
public  intgetBaseline(int width, int height)
     Returns the baseline.
public  BaselineResizeBehaviorgetBaselineResizeBehavior()
     Returns an enum indicating how the baseline of the component changes as the size changes.
public  RectanglegetBounds()
     Gets the bounds of this component in the form of a Rectangle object.
public  RectanglegetBounds(Rectangle rv)
     Stores the bounds of this component into "return value" rv and return rv.
 intgetBoundsOp()
    
 BufferStrategygetBufferStrategy()
    
public  ColorModelgetColorModel()
     Gets the instance of ColorModel used to display the component on the output device.
public  ComponentgetComponentAt(int x, int y)
     Determines if this component or one of its immediate subcomponents contains the (xy) location, and if so, returns the containing component.
public  ComponentgetComponentAt(Point p)
     Returns the component or subcomponent that contains the specified point.
public synchronized  ComponentListener[]getComponentListeners()
     Returns an array of all the component listeners registered on this component.
public  ComponentOrientationgetComponentOrientation()
     Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component.
 WindowgetContainingWindow()
     Returns the Window ancestor of the component.
static  WindowgetContainingWindow(Component comp)
     Returns the Window ancestor of the component comp.
public  CursorgetCursor()
     Gets the cursor set in the component.
final  CursorgetCursor_NoClientCode()
    
public synchronized  DropTargetgetDropTarget()
     Gets the DropTarget associated with this Component.
public  ContainergetFocusCycleRootAncestor()
     Returns the Container which is the focus cycle root of this Component's focus traversal cycle.
public synchronized  FocusListener[]getFocusListeners()
     Returns an array of all the focus listeners registered on this component.
public  Set<AWTKeyStroke>getFocusTraversalKeys(int id)
     Returns the Set of focus traversal keys for a given traversal operation for this Component.
public  booleangetFocusTraversalKeysEnabled()
     Returns whether focus traversal keys are enabled for this Component. Components for which focus traversal keys are disabled receive key events for focus traversal keys.
final  SetgetFocusTraversalKeys_NoIDCheck(int id)
    
public  FontgetFont()
     Gets the font of this component.
public  FontMetricsgetFontMetrics(Font font)
     Gets the font metrics for the specified font. Warning: Since Font metrics are affected by the java.awt.font.FontRenderContext FontRenderContext and this method does not provide one, it can return only metrics for the default render context which may not match that used when rendering on the Component if Graphics2D functionality is being used.
final  FontgetFont_NoClientCode()
    
public  ColorgetForeground()
     Gets the foreground color of this component.
public  GraphicsgetGraphics()
     Creates a graphics context for this component.
public  GraphicsConfigurationgetGraphicsConfiguration()
     Gets the GraphicsConfiguration associated with this Component.
final  GraphicsConfigurationgetGraphicsConfiguration_NoClientCode()
    
final  GraphicsgetGraphics_NoClientCode()
    
public  intgetHeight()
     Returns the current height of this component.
public synchronized  HierarchyBoundsListener[]getHierarchyBoundsListeners()
     Returns an array of all the hierarchy bounds listeners registered on this component.
public synchronized  HierarchyListener[]getHierarchyListeners()
     Returns an array of all the hierarchy listeners registered on this component.
public  booleangetIgnoreRepaint()
    
public  InputContextgetInputContext()
     Gets the input context used by this component for handling the communication with input methods when text is entered in this component.
public synchronized  InputMethodListener[]getInputMethodListeners()
     Returns an array of all the input method listeners registered on this component.
public  InputMethodRequestsgetInputMethodRequests()
     Gets the input method request handler which supports requests from input methods for this component.
public synchronized  KeyListener[]getKeyListeners()
     Returns an array of all the key listeners registered on this component.
public  T[]getListeners(Class<T> listenerType)
     Returns an array of all the objects currently registered as FooListeners upon this Component.
public  LocalegetLocale()
     Gets the locale of this component.
public  PointgetLocation()
     Gets the location of this component in the form of a point specifying the component's top-left corner. The location will be relative to the parent's coordinate space.

Due to the asynchronous nature of native event handling, this method can return outdated values (for instance, after several calls of setLocation() in rapid succession).

public  PointgetLocation(Point rv)
     Stores the x,y origin of this component into "return value" rv and return rv.
public  PointgetLocationOnScreen()
     Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space.
final  PointgetLocationOnScreen_NoTreeLock()
    
public  DimensiongetMaximumSize()
     Gets the maximum size of this component.
public  DimensiongetMinimumSize()
     Gets the mininimum size of this component.
public synchronized  MouseListener[]getMouseListeners()
     Returns an array of all the mouse listeners registered on this component.
public synchronized  MouseMotionListener[]getMouseMotionListeners()
     Returns an array of all the mouse motion listeners registered on this component.
public  PointgetMousePosition()
     Returns the position of the mouse pointer in this Component's coordinate space if the Component is directly under the mouse pointer, otherwise returns null. If the Component is not showing on the screen, this method returns null even if the mouse pointer is above the area where the Component would be displayed. If the Component is partially or fully obscured by other Components or native windows, this method returns a non-null value only if the mouse pointer is located above the unobscured part of the Component.

For Containers it returns a non-null value if the mouse is above the Container itself or above any of its descendants. Use Container.getMousePosition(boolean) if you need to exclude children.

Sometimes the exact mouse coordinates are not important, and the only thing that matters is whether a specific Component is under the mouse pointer.

public synchronized  MouseWheelListener[]getMouseWheelListeners()
     Returns an array of all the mouse wheel listeners registered on this component.
public  StringgetName()
     Gets the name of the component.
 ContainergetNativeContainer()
    
public  ContainergetParent()
     Gets the parent of this component.
final  ContainergetParent_NoClientCode()
    
public  ComponentPeergetPeer()
    
public  DimensiongetPreferredSize()
     Gets the preferred size of this component.
public synchronized  PropertyChangeListener[]getPropertyChangeListeners()
     Returns an array of all the property change listeners registered on this component.
public synchronized  PropertyChangeListener[]getPropertyChangeListeners(String propertyName)
     Returns an array of all the listeners which have been associated with the named property.
public  DimensiongetSize()
     Returns the size of this component in the form of a Dimension object.
public  DimensiongetSize(Dimension rv)
     Stores the width/height of this component into "return value" rv and return rv.
public  ToolkitgetToolkit()
     Gets the toolkit of this component.
final  ToolkitgetToolkitImpl()
    
 ContainergetTraversalRoot()
    
final public  ObjectgetTreeLock()
     Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations.
public  intgetWidth()
     Returns the current width of this component.
public  intgetX()
     Returns the current x coordinate of the components origin.
public  intgetY()
     Returns the current y coordinate of the components origin.
public  booleangotFocus(Event evt, Object what)
    
public  booleanhandleEvent(Event evt)
    
public  booleanhasFocus()
     Returns true if this Component is the focus owner.
public  voidhide()
    
public  booleanimageUpdate(Image img, int infoflags, int x, int y, int w, int h)
     Repaints the component when the image has changed. This imageUpdate method of an ImageObserver is called when more information about an image which had been previously requested using an asynchronous routine such as the drawImage method of Graphics becomes available. See the definition of imageUpdate for more information on this method and its arguments.

The imageUpdate method of Component incrementally draws an image on the component as more of the bits of the image are available.

If the system property awt.image.incrementaldraw is missing or has the value true, the image is incrementally drawn.

 voidinitializeFocusTraversalKeys()
    
public  booleaninside(int x, int y)
    
public  voidinvalidate()
     Invalidates this component.
public  booleanisBackgroundSet()
     Returns whether the background color has been explicitly set for this Component.
final  booleanisCoalescingEnabled()
     Indicates whether coalesceEvents may do something.
public  booleanisCursorSet()
     Returns whether the cursor has been explicitly set for this Component.
public  booleanisDisplayable()
     Determines whether this component is displayable.
public  booleanisDoubleBuffered()
     Returns true if this component is painted to an offscreen image ("buffer") that's copied to the screen later.
public  booleanisEnabled()
     Determines whether this component is enabled.
final  booleanisEnabledImpl()
    
public  booleanisFocusCycleRoot(Container container)
     Returns whether the specified Container is the focus cycle root of this Component's focus traversal cycle.
public  booleanisFocusOwner()
     Returns true if this Component is the focus owner.
public  booleanisFocusTraversable()
     Returns whether this Component can become the focus owner.
final  booleanisFocusTraversableOverridden()
    
public  booleanisFocusable()
     Returns whether this Component can be focused.
public  booleanisFontSet()
     Returns whether the font has been explicitly set for this Component.
public  booleanisForegroundSet()
     Returns whether the foreground color has been explicitly set for this Component.
static  booleanisInstanceOf(Object obj, String className)
     Checks that the given object is instance of the given class.
Parameters:
  obj - Object to be checked
Parameters:
  className - The name of the class.
public  booleanisLightweight()
     A lightweight component doesn't have a native toolkit peer.
public  booleanisMaximumSizeSet()
     Returns true if the maximum size has been set to a non-null value otherwise returns false.
public  booleanisMinimumSizeSet()
     Returns whether or not setMinimumSize has been invoked with a non-null value.
public  booleanisOpaque()
     Returns true if this component is completely opaque, returns false by default.

An opaque component paints every pixel within its rectangular region.

public  booleanisPreferredSizeSet()
     Returns true if the preferred size has been set to a non-null value otherwise returns false.
 booleanisRecursivelyVisible()
     Determines whether this component will be displayed on the screen.
 booleanisSameOrAncestorOf(Component comp, boolean allowChildren)
     Overridden in Container.
public  booleanisShowing()
     Determines whether this component is showing on screen.
public  booleanisValid()
     Determines whether this component is valid.
public  booleanisVisible()
     Determines whether this component should be visible when its parent is visible.
final  booleanisVisible_NoClientCode()
    
public  booleankeyDown(Event evt, int key)
    
public  booleankeyUp(Event evt, int key)
    
public  voidlayout()
    
 voidlightweightPaint(Graphics g)
     Simulates the peer callbacks into java.awt for painting of lightweight Components.
 voidlightweightPrint(Graphics g)
     Simulates the peer callbacks into java.awt for printing of lightweight Components.
public  voidlist()
     Prints a listing of this component to the standard system output stream System.out.
public  voidlist(PrintStream out)
     Prints a listing of this component to the specified output stream.
public  voidlist(PrintStream out, int indent)
     Prints out a list, starting at the specified indentation, to the specified print stream.
public  voidlist(PrintWriter out)
     Prints a listing to the specified print writer.
public  voidlist(PrintWriter out, int indent)
     Prints out a list, starting at the specified indentation, to the specified print writer.
public  Componentlocate(int x, int y)
    
public  Pointlocation()
    
public  booleanlostFocus(Event evt, Object what)
    
public  DimensionminimumSize()
    
public  booleanmouseDown(Event evt, int x, int y)
    
public  booleanmouseDrag(Event evt, int x, int y)
    
public  booleanmouseEnter(Event evt, int x, int y)
    
public  booleanmouseExit(Event evt, int x, int y)
    
public  booleanmouseMove(Event evt, int x, int y)
    
public  booleanmouseUp(Event evt, int x, int y)
    
public  voidmove(int x, int y)
    
public  voidnextFocus()
    
 intnumListening(long mask)
    
public  voidpaint(Graphics g)
     Paints this component.
public  voidpaintAll(Graphics g)
     Paints this component and all of its subcomponents.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component.

 voidpaintHeavyweightComponents(Graphics g)
     Paints all the heavyweight subcomponents.
protected  StringparamString()
     Returns a string representing the state of this component.
 PointpointRelativeToComponent(Point absolute)
     Translates absolute coordinates into coordinates in the coordinate space of this component.
public  booleanpostEvent(Event e)
    
static  booleanpostNextFocusHelper(Component toFocus, CausedFocusEvent.Cause cause)
    
 booleanpostsOldMouseEvents()
    
final  ComponentpreNextFocusHelper()
    
public  DimensionpreferredSize()
    
public  booleanprepareImage(Image image, ImageObserver observer)
     Prepares an image for rendering on this component.
public  booleanprepareImage(Image image, int width, int height, ImageObserver observer)
     Prepares an image for rendering on this component at the specified width and height.
public  voidprint(Graphics g)
     Prints this component.
public  voidprintAll(Graphics g)
     Prints this component and all of its subcomponents.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component.

 voidprintHeavyweightComponents(Graphics g)
     Prints all the heavyweight subcomponents.
protected  voidprocessComponentEvent(ComponentEvent e)
     Processes component events occurring on this component by dispatching them to any registered ComponentListener objects.

This method is not called unless component events are enabled for this component.

protected  voidprocessEvent(AWTEvent e)
     Processes events occurring on this component.
protected  voidprocessFocusEvent(FocusEvent e)
     Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.

This method is not called unless focus events are enabled for this component.

protected  voidprocessHierarchyBoundsEvent(HierarchyEvent e)
     Processes hierarchy bounds events occurring on this component by dispatching them to any registered HierarchyBoundsListener objects.

This method is not called unless hierarchy bounds events are enabled for this component.

protected  voidprocessHierarchyEvent(HierarchyEvent e)
     Processes hierarchy events occurring on this component by dispatching them to any registered HierarchyListener objects.

This method is not called unless hierarchy events are enabled for this component.

protected  voidprocessInputMethodEvent(InputMethodEvent e)
     Processes input method events occurring on this component by dispatching them to any registered InputMethodListener objects.

This method is not called unless input method events are enabled for this component.

protected  voidprocessKeyEvent(KeyEvent e)
     Processes key events occurring on this component by dispatching them to any registered KeyListener objects.

This method is not called unless key events are enabled for this component.

protected  voidprocessMouseEvent(MouseEvent e)
     Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects.

This method is not called unless mouse events are enabled for this component.

protected  voidprocessMouseMotionEvent(MouseEvent e)
     Processes mouse motion events occurring on this component by dispatching them to any registered MouseMotionListener objects.

This method is not called unless mouse motion events are enabled for this component.

protected  voidprocessMouseWheelEvent(MouseWheelEvent e)
     Processes mouse wheel events occurring on this component by dispatching them to any registered MouseWheelListener objects.

This method is not called unless mouse wheel events are enabled for this component.

public  voidremove(MenuComponent popup)
     Removes the specified popup menu from the component.
public synchronized  voidremoveComponentListener(ComponentListener l)
     Removes the specified component listener so that it no longer receives component events from this component.
public synchronized  voidremoveFocusListener(FocusListener l)
     Removes the specified focus listener so that it no longer receives focus events from this component.
public  voidremoveHierarchyBoundsListener(HierarchyBoundsListener l)
     Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component.
public  voidremoveHierarchyListener(HierarchyListener l)
     Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component.
public synchronized  voidremoveInputMethodListener(InputMethodListener l)
     Removes the specified input method listener so that it no longer receives input method events from this component.
public synchronized  voidremoveKeyListener(KeyListener l)
     Removes the specified key listener so that it no longer receives key events from this component.
public synchronized  voidremoveMouseListener(MouseListener l)
     Removes the specified mouse listener so that it no longer receives mouse events from this component.
public synchronized  voidremoveMouseMotionListener(MouseMotionListener l)
     Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component.
public synchronized  voidremoveMouseWheelListener(MouseWheelListener l)
     Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component.
public  voidremoveNotify()
     Makes this Component undisplayable by destroying it native screen resource.
public synchronized  voidremovePropertyChangeListener(PropertyChangeListener listener)
     Removes a PropertyChangeListener from the listener list.
public synchronized  voidremovePropertyChangeListener(String propertyName, PropertyChangeListener listener)
     Removes a PropertyChangeListener from the listener list for a specific property.
public  voidrepaint()
     Repaints this component.

If this component is a lightweight component, this method causes a call to this component's paint method as soon as possible.

public  voidrepaint(long tm)
     Repaints the component.
public  voidrepaint(int x, int y, int width, int height)
     Repaints the specified rectangle of this component.

If this component is a lightweight component, this method causes a call to this component's paint method as soon as possible.

public  voidrepaint(long tm, int x, int y, int width, int height)
     Repaints the specified rectangle of this component within tm milliseconds.
public  voidrequestFocus()
     Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.
 voidrequestFocus(CausedFocusEvent.Cause cause)
    
protected  booleanrequestFocus(boolean temporary)
     Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.
 booleanrequestFocus(boolean temporary, CausedFocusEvent.Cause cause)
    
final  booleanrequestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed)
    
final  booleanrequestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed, CausedFocusEvent.Cause cause)
    
public  booleanrequestFocusInWindow()
     Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.
 booleanrequestFocusInWindow(CausedFocusEvent.Cause cause)
    
protected  booleanrequestFocusInWindow(boolean temporary)
     Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.
 booleanrequestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause)
    
 voidresetGC()
     Resets this Component's GraphicsConfiguration back to a default value.
public  voidreshape(int x, int y, int width, int height)
    
public  voidresize(int width, int height)
    
public  voidresize(Dimension d)
    
public  voidsetBackground(Color c)
     Sets the background color of this component.
public  voidsetBounds(int x, int y, int width, int height)
     Moves and resizes this component.
public  voidsetBounds(Rectangle r)
     Moves and resizes this component to conform to the new bounding rectangle r.
 voidsetBoundsOp(int op)
    
public  voidsetComponentOrientation(ComponentOrientation o)
     Sets the language-sensitive orientation that is to be used to order the elements or text within this component.
public  voidsetCursor(Cursor cursor)
     Sets the cursor image to the specified cursor.
public synchronized  voidsetDropTarget(DropTarget dt)
     Associate a DropTarget with this component.
public  voidsetEnabled(boolean b)
     Enables or disables this component, depending on the value of the parameter b.
public  voidsetFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes)
     Sets the focus traversal keys for a given traversal operation for this Component.

The default values for a Component's focus traversal keys are implementation-dependent.

public  voidsetFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)
     Sets whether focus traversal keys are enabled for this Component. Components for which focus traversal keys are disabled receive key events for focus traversal keys.
final  voidsetFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes)
    
public  voidsetFocusable(boolean focusable)
     Sets the focusable state of this Component to the specified value.
public  voidsetFont(Font f)
     Sets the font of this component.
public  voidsetForeground(Color c)
     Sets the foreground color of this component.
 voidsetGCFromPeer()
    
public  voidsetIgnoreRepaint(boolean ignoreRepaint)
     Sets whether or not paint messages received from the operating system should be ignored.
public  voidsetLocale(Locale l)
     Sets the locale of this component.
public  voidsetLocation(int x, int y)
     Moves this component to a new location.
public  voidsetLocation(Point p)
     Moves this component to a new location.
public  voidsetMaximumSize(Dimension maximumSize)
     Sets the maximum size of this component to a constant value.
public  voidsetMinimumSize(Dimension minimumSize)
     Sets the minimum size of this component to a constant value.
public  voidsetName(String name)
     Sets the name of the component to the specified string.
public  voidsetPreferredSize(Dimension preferredSize)
     Sets the preferred size of this component to a constant value.
static synchronized  voidsetRequestFocusController(RequestFocusController requestController)
    
public  voidsetSize(int width, int height)
     Resizes this component so that it has width width and height height.
public  voidsetSize(Dimension d)
     Resizes this component so that it has width d.width and height d.height.
public  voidsetVisible(boolean b)
     Shows or hides this component depending on the value of parameter b.
public  voidshow()
    
public  voidshow(boolean b)
    
public  Dimensionsize()
    
public  StringtoString()
     Returns a string representation of this component and its values.
public  voidtransferFocus()
     Transfers the focus to the next component, as though this Component were the focus owner.
public  voidtransferFocusBackward()
     Transfers the focus to the previous component, as though this Component were the focus owner.
public  voidtransferFocusUpCycle()
     Transfers the focus up one focus traversal cycle.
public  voidupdate(Graphics g)
     Updates this component.

If this component is not a lightweight component, the AWT calls the update method in response to a call to repaint.

final  voidupdateCursorImmediately()
     Updates the cursor.
public  voidvalidate()
     Ensures that this component has a valid layout.

Field Detail
BOTTOM_ALIGNMENT
final public static float BOTTOM_ALIGNMENT(Code)
Ease-of-use constant for getAlignmentY. Specifies an alignment to the bottom of the component.
See Also:   Component.getAlignmentY



CENTER_ALIGNMENT
final public static float CENTER_ALIGNMENT(Code)
Ease-of-use constant for getAlignmentY and getAlignmentX. Specifies an alignment to the center of the component
See Also:   Component.getAlignmentX
See Also:   Component.getAlignmentY



LEFT_ALIGNMENT
final public static float LEFT_ALIGNMENT(Code)
Ease-of-use constant for getAlignmentX. Specifies an alignment to the left side of the component.
See Also:   Component.getAlignmentX



LOCK
final static Object LOCK(Code)
The locking object for AWT component-tree and layout operations.
See Also:   Component.getTreeLock



RIGHT_ALIGNMENT
final public static float RIGHT_ALIGNMENT(Code)
Ease-of-use constant for getAlignmentX. Specifies an alignment to the right side of the component.
See Also:   Component.getAlignmentX



TOP_ALIGNMENT
final public static float TOP_ALIGNMENT(Code)
Ease-of-use constant for getAlignmentY(). Specifies an alignment to the top of the component.
See Also:   Component.getAlignmentY



accessibleContext
AccessibleContext accessibleContext(Code)



actionListenerK
final static String actionListenerK(Code)
Internal, constants for serialization



adjustmentListenerK
final static String adjustmentListenerK(Code)



appContext
transient AppContext appContext(Code)
The AppContext of the component. Applets/Plugin may change the AppContext.



background
Color background(Code)
The background color for this component. background can be null.
See Also:   Component.getBackground
See Also:   Component.setBackground



bufferStrategy
transient BufferStrategy bufferStrategy(Code)
A reference to a BufferStrategy object used to manipulate the buffers on this component.
since:
   1.4
See Also:   java.awt.image.BufferStrategy
See Also:   Component.getBufferStrategy()



componentListener
transient ComponentListener componentListener(Code)



componentListenerK
final static String componentListenerK(Code)



componentOrientation
transient ComponentOrientation componentOrientation(Code)
The orientation for this component.
See Also:   Component.getComponentOrientation
See Also:   Component.setComponentOrientation



containerListenerK
final static String containerListenerK(Code)



cursor
Cursor cursor(Code)
The cursor displayed when pointer is over this component. This value can be null.
See Also:   Component.getCursor
See Also:   Component.setCursor



dropTarget
DropTarget dropTarget(Code)
The DropTarget associated with this component.
since:
   1.2
See Also:   Component.setDropTarget
See Also:   Component.getDropTarget



enabled
boolean enabled(Code)
True when the object is enabled. An object that is not enabled does not interact with the user.
See Also:   Component.isEnabled
See Also:   Component.setEnabled



eventCache
transient EventQueueItem[] eventCache(Code)



eventMask
long eventMask(Code)
The eventMask is ONLY set by subclasses via enableEvents. The mask should NOT be set when listeners are registered so that we can distinguish the difference between when listeners request events and subclasses request them. One bit is used to indicate whether input methods are enabled; this bit is set by enableInputMethods and is on by default.
See Also:   Component.enableInputMethods
See Also:   AWTEvent



focusListener
transient FocusListener focusListener(Code)



focusListenerK
final static String focusListenerK(Code)



focusTraversalKeys
Set[] focusTraversalKeys(Code)
The focus traversal keys. These keys will generate focus traversal behavior for Components for which focus traversal keys are enabled. If a value of null is specified for a traversal key, this Component inherits that traversal key from its parent. If all ancestors of this Component have null specified for that traversal key, then the current KeyboardFocusManager's default traversal key is used.
See Also:   Component.setFocusTraversalKeys
See Also:   Component.getFocusTraversalKeys
since:
   1.4



font
Font font(Code)
The font used by this component. The font can be null.
See Also:   Component.getFont
See Also:   Component.setFont



foreground
Color foreground(Code)
The foreground color for this component. foreground can be null.
See Also:   Component.getForeground
See Also:   Component.setForeground



graphicsConfig
transient GraphicsConfiguration graphicsConfig(Code)
A reference to a GraphicsConfiguration object used to describe the characteristics of a graphics destination. This value can be null.
since:
   1.3
See Also:   GraphicsConfiguration
See Also:   Component.getGraphicsConfiguration



height
int height(Code)
The height of the component.
See Also:   Component.getSize



hierarchyBoundsListener
transient HierarchyBoundsListener hierarchyBoundsListener(Code)



hierarchyBoundsListenerK
final static String hierarchyBoundsListenerK(Code)



hierarchyListener
transient HierarchyListener hierarchyListener(Code)



hierarchyListenerK
final static String hierarchyListenerK(Code)



ignoreRepaint
boolean ignoreRepaint(Code)
True when the object should ignore all repaint events.
since:
   1.4
See Also:   Component.setIgnoreRepaint
See Also:   Component.getIgnoreRepaint



incRate
static int incRate(Code)



inputMethodListener
transient InputMethodListener inputMethodListener(Code)



inputMethodListenerK
final static String inputMethodListenerK(Code)



isInc
static boolean isInc(Code)
Static properties for incremental drawing.
See Also:   Component.imageUpdate



isPacked
boolean isPacked(Code)



itemListenerK
final static String itemListenerK(Code)



keyListener
transient KeyListener keyListener(Code)



keyListenerK
final static String keyListenerK(Code)



locale
Locale locale(Code)
The locale for the component.
See Also:   Component.getLocale
See Also:   Component.setLocale



maxSize
Dimension maxSize(Code)
Maximum size



maxSizeSet
boolean maxSizeSet(Code)
Whether or not setMaximumSize has been invoked with a non-null value.



minSize
Dimension minSize(Code)
Minimum size. (This field perhaps should have been transient).



minSizeSet
boolean minSizeSet(Code)
Whether or not setMinimumSize has been invoked with a non-null value.



mouseListener
transient MouseListener mouseListener(Code)



mouseListenerK
final static String mouseListenerK(Code)



mouseMotionListener
transient MouseMotionListener mouseMotionListener(Code)



mouseMotionListenerK
final static String mouseMotionListenerK(Code)



mouseWheelListener
transient MouseWheelListener mouseWheelListener(Code)



mouseWheelListenerK
final static String mouseWheelListenerK(Code)



nativeInLightFixer
transient NativeInLightFixer nativeInLightFixer(Code)



newEventsOnly
boolean newEventsOnly(Code)
newEventsOnly will be true if the event is one of the event types enabled for the component. It will then allow for normal processing to continue. If it is false the event is passed to the component's parent and up the ancestor tree until the event has been consumed.
See Also:   Component.dispatchEvent



ownedWindowK
final static String ownedWindowK(Code)



parent
transient Container parent(Code)
The parent of the object. It may be null for top-level components.
See Also:   Component.getParent



peer
transient ComponentPeer peer(Code)
The peer of the component. The peer implements the component's behavior. The peer is set when the Component is added to a container that also is a peer.
See Also:   Component.addNotify
See Also:   Component.removeNotify



peerFont
Font peerFont(Code)
The font which the peer is currently using. (null if no peer exists.)



popups
Vector popups(Code)

See Also:   Component.add



prefSize
Dimension prefSize(Code)
Preferred size. (This field perhaps should have been transient).



prefSizeSet
boolean prefSizeSet(Code)
Whether or not setPreferredSize has been invoked with a non-null value.



textListenerK
final static String textListenerK(Code)



valid
volatile boolean valid(Code)
True when the object is valid. An invalid object needs to be layed out. This flag is set to false when the object size is changed.
See Also:   Component.isValid
See Also:   Component.validate
See Also:   Component.invalidate



visible
boolean visible(Code)
True when the object is visible. An object that is not visible is not drawn on the screen.
See Also:   Component.isVisible
See Also:   Component.setVisible



width
int width(Code)
The width of the component.
See Also:   Component.getSize



windowClosingException
transient RuntimeException windowClosingException(Code)



windowFocusListenerK
final static String windowFocusListenerK(Code)



windowListenerK
final static String windowListenerK(Code)



windowStateListenerK
final static String windowStateListenerK(Code)



x
int x(Code)
The x position of the component in the parent's coordinate system.
See Also:   Component.getLocation



y
int y(Code)
The y position of the component in the parent's coordinate system.
See Also:   Component.getLocation




Constructor Detail
Component
protected Component()(Code)
Constructs a new component. Class Component can be extended directly to create a lightweight component that does not utilize an opaque native window. A lightweight component must be hosted by a native container somewhere higher up in the component tree (for example, by a Frame object).




Method Detail
action
public boolean action(Event evt, Object what)(Code)



add
public void add(PopupMenu popup)(Code)
Adds the specified popup menu to the component.
Parameters:
  popup - the popup menu to be added to the component.
See Also:   Component.remove(MenuComponent)
exception:
  NullPointerException - if popup is null
since:
   JDK1.1



addComponentListener
public synchronized void addComponentListener(ComponentListener l)(Code)
Adds the specified component listener to receive component events from this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the component listener
See Also:   java.awt.event.ComponentEvent
See Also:   java.awt.event.ComponentListener
See Also:   Component.removeComponentListener
See Also:   Component.getComponentListeners
since:
   JDK1.1




addFocusListener
public synchronized void addFocusListener(FocusListener l)(Code)
Adds the specified focus listener to receive focus events from this component when this component gains input focus. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the focus listener
See Also:   java.awt.event.FocusEvent
See Also:   java.awt.event.FocusListener
See Also:   Component.removeFocusListener
See Also:   Component.getFocusListeners
since:
   JDK1.1




addHierarchyBoundsListener
public void addHierarchyBoundsListener(HierarchyBoundsListener l)(Code)
Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the hierarchy bounds listener
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyBoundsListener
See Also:   Component.removeHierarchyBoundsListener
See Also:   Component.getHierarchyBoundsListeners
since:
   1.3




addHierarchyListener
public void addHierarchyListener(HierarchyListener l)(Code)
Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the hierarchy listener
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyListener
See Also:   Component.removeHierarchyListener
See Also:   Component.getHierarchyListeners
since:
   1.3




addInputMethodListener
public synchronized void addInputMethodListener(InputMethodListener l)(Code)
Adds the specified input method listener to receive input method events from this component. A component will only receive input method events from input methods if it also overrides getInputMethodRequests to return an InputMethodRequests instance. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the input method listener
See Also:   java.awt.event.InputMethodEvent
See Also:   java.awt.event.InputMethodListener
See Also:   Component.removeInputMethodListener
See Also:   Component.getInputMethodListeners
See Also:   Component.getInputMethodRequests
since:
   1.2




addKeyListener
public synchronized void addKeyListener(KeyListener l)(Code)
Adds the specified key listener to receive key events from this component. If l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the key listener.
See Also:   java.awt.event.KeyEvent
See Also:   java.awt.event.KeyListener
See Also:   Component.removeKeyListener
See Also:   Component.getKeyListeners
since:
   JDK1.1




addMouseListener
public synchronized void addMouseListener(MouseListener l)(Code)
Adds the specified mouse listener to receive mouse events from this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse listener
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseListener
See Also:   Component.removeMouseListener
See Also:   Component.getMouseListeners
since:
   JDK1.1




addMouseMotionListener
public synchronized void addMouseMotionListener(MouseMotionListener l)(Code)
Adds the specified mouse motion listener to receive mouse motion events from this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse motion listener
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseMotionListener
See Also:   Component.removeMouseMotionListener
See Also:   Component.getMouseMotionListeners
since:
   JDK1.1




addMouseWheelListener
public synchronized void addMouseWheelListener(MouseWheelListener l)(Code)
Adds the specified mouse wheel listener to receive mouse wheel events from this component. Containers also receive mouse wheel events from sub-components.

For information on how mouse wheel events are dispatched, see the class description for MouseWheelEvent .

If l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse wheel listener
See Also:   java.awt.event.MouseWheelEvent
See Also:   java.awt.event.MouseWheelListener
See Also:   Component.removeMouseWheelListener
See Also:   Component.getMouseWheelListeners
since:
   1.4




addNotify
public void addNotify()(Code)
Makes this Component displayable by connecting it to a native screen resource. This method is called internally by the toolkit and should not be called directly by programs.
See Also:   Component.isDisplayable
See Also:   Component.removeNotify
since:
   JDK1.0



addPropertyChangeListener
public synchronized void addPropertyChangeListener(PropertyChangeListener listener)(Code)
Adds a PropertyChangeListener to the listener list. The listener is registered for all bound properties of this class, including the following:
  • this Component's font ("font")
  • this Component's background color ("background")
  • this Component's foreground color ("foreground")
  • this Component's focusability ("focusable")
  • this Component's focus traversal keys enabled state ("focusTraversalKeysEnabled")
  • this Component's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
  • this Component's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
  • this Component's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
  • this Component's preferred size ("preferredSize")
  • this Component's minimum size ("minimumSize")
  • this Component's maximum size ("maximumSize")
  • this Component's name ("name")
Note that if this Component is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

If listener is null, no exception is thrown and no action is performed.
Parameters:
  listener - the property change listener to be added
See Also:   Component.removePropertyChangeListener
See Also:   Component.getPropertyChangeListeners
See Also:   Component.addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)




addPropertyChangeListener
public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)
Adds a PropertyChangeListener to the listener list for a specific property. The specified property may be user-defined, or one of the following:
  • this Component's font ("font")
  • this Component's background color ("background")
  • this Component's foreground color ("foreground")
  • this Component's focusability ("focusable")
  • this Component's focus traversal keys enabled state ("focusTraversalKeysEnabled")
  • this Component's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
  • this Component's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
  • this Component's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
Note that if this Component is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

If propertyName or listener is null, no exception is thrown and no action is taken.
Parameters:
  propertyName - one of the property names listed above
Parameters:
  listener - the property change listener to be added
See Also:   Component.removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
See Also:   Component.getPropertyChangeListeners(java.lang.String)
See Also:   Component.addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)




adjustListeningChildrenOnParent
void adjustListeningChildrenOnParent(long mask, int num)(Code)



applyComponentOrientation
public void applyComponentOrientation(ComponentOrientation orientation)(Code)
Sets the ComponentOrientation property of this component and all components contained within it.
Parameters:
  orientation - the new component orientation of this component andthe components contained within it.
exception:
  NullPointerException - if orientation is null.
See Also:   Component.setComponentOrientation
See Also:   Component.getComponentOrientation
since:
   1.4



areFocusTraversalKeysSet
public boolean areFocusTraversalKeysSet(int id)(Code)
Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Component. If this method returns false, this Component is inheriting the Set from an ancestor, or from the current KeyboardFocusManager.
Parameters:
  id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS true if the the Set of focus traversal keys for thegiven focus traversal operation has been explicitly defined forthis Component; false otherwise.
throws:
  IllegalArgumentException - if id is not one ofKeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
since:
   1.4



areInputMethodsEnabled
boolean areInputMethodsEnabled()(Code)



autoProcessMouseWheel
void autoProcessMouseWheel(MouseWheelEvent e)(Code)



bounds
public Rectangle bounds()(Code)



canBeFocusOwner
final boolean canBeFocusOwner()(Code)
Checks that this component meets the prerequesites to be focus owner: - it is enabled, visible, focusable - it's parents are all enabled and showing - top-level window is focusable - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts this component as focus owner
since:
   1.5



checkGD
void checkGD(String stringID)(Code)
Checks that this component's GraphicsDevice idString matches the string argument.



checkImage
public int checkImage(Image image, ImageObserver observer)(Code)
Returns the status of the construction of a screen representation of the specified image.

This method does not cause the image to begin loading. An application must use the prepareImage method to force the loading of an image.

Information on the flags returned by this method can be found with the discussion of the ImageObserver interface.
Parameters:
  image - the Image object whose statusis being checked
Parameters:
  observer - the ImageObserverobject to be notified as the image is being prepared the bitwise inclusive OR ofImageObserver flags indicating whatinformation about the image is currently available
See Also:   Component.prepareImage(Image,int,int,java.awt.image.ImageObserver)
See Also:   Toolkit.checkImage(Imageintintjava.awt.image.ImageObserver)
See Also:   java.awt.image.ImageObserver
since:
   JDK1.0




checkImage
public int checkImage(Image image, int width, int height, ImageObserver observer)(Code)
Returns the status of the construction of a screen representation of the specified image.

This method does not cause the image to begin loading. An application must use the prepareImage method to force the loading of an image.

The checkImage method of Component calls its peer's checkImage method to calculate the flags. If this component does not yet have a peer, the component's toolkit's checkImage method is called instead.

Information on the flags returned by this method can be found with the discussion of the ImageObserver interface.
Parameters:
  image - the Image object whose statusis being checked
Parameters:
  width - the width of the scaled versionwhose status is to be checked
Parameters:
  height - the height of the scaled versionwhose status is to be checked
Parameters:
  observer - the ImageObserver objectto be notified as the image is being prepared the bitwise inclusive OR ofImageObserver flags indicating whatinformation about the image is currently available
See Also:   Component.prepareImage(Image,int,int,java.awt.image.ImageObserver)
See Also:   Toolkit.checkImage(Imageintintjava.awt.image.ImageObserver)
See Also:   java.awt.image.ImageObserver
since:
   JDK1.0




checkWindowClosingException
boolean checkWindowClosingException()(Code)



clearCurrentFocusCycleRootOnHide
void clearCurrentFocusCycleRootOnHide()(Code)



clearMostRecentFocusOwnerOnHide
void clearMostRecentFocusOwnerOnHide()(Code)



coalesceEvents
protected AWTEvent coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent)(Code)
Potentially coalesce an event being posted with an existing event. This method is called by EventQueue.postEvent if an event with the same ID as the event to be posted is found in the queue (both events must have this component as their source). This method either returns a coalesced event which replaces the existing event (and the new event is then discarded), or null to indicate that no combining should be done (add the second event to the end of the queue). Either event parameter may be modified and returned, as the other one is discarded unless null is returned.

This implementation of coalesceEvents coalesces two event types: mouse move (and drag) events, and paint (and update) events. For mouse move events the last event is always returned, causing intermediate moves to be discarded. For paint events, the new event is coalesced into a complex RepaintArea in the peer. The new AWTEvent is always returned.
Parameters:
  existingEvent - the event already on the EventQueue
Parameters:
  newEvent - the event being posted to the EventQueue a coalesced event, or null indicating that no coalescing was done




constructComponentName
String constructComponentName()(Code)
Constructs a name for this component. Called by getName when the name is null.



contains
public boolean contains(int x, int y)(Code)
Checks whether this component "contains" the specified point, where x and y are defined to be relative to the coordinate system of this component.
Parameters:
  x - the x coordinate of the point
Parameters:
  y - the y coordinate of the point
See Also:   Component.getComponentAt(int,int)
since:
   JDK1.1



contains
public boolean contains(Point p)(Code)
Checks whether this component "contains" the specified point, where the point's x and y coordinates are defined to be relative to the coordinate system of this component.
Parameters:
  p - the point
See Also:   Component.getComponentAt(Point)
since:
   JDK1.1



containsFocus
boolean containsFocus()(Code)



countHierarchyMembers
int countHierarchyMembers()(Code)



createBufferStrategy
void createBufferStrategy(int numBuffers)(Code)
Creates a new strategy for multi-buffering on this component. Multi-buffering is useful for rendering performance. This method attempts to create the best strategy available with the number of buffers supplied. It will always create a BufferStrategy with that number of buffers. A page-flipping strategy is attempted first, then a blitting strategy using accelerated buffers. Finally, an unaccelerated blitting strategy is used.

Each time this method is called, the existing buffer strategy for this component is discarded.
Parameters:
  numBuffers - number of buffers to create, including the front buffer
exception:
  IllegalArgumentException - if numBuffers is less than 1.
exception:
  IllegalStateException - if the component is not displayable
See Also:   Component.isDisplayable
See Also:   Window.getBufferStrategy
See Also:   Canvas.getBufferStrategy
since:
   1.4




createBufferStrategy
void createBufferStrategy(int numBuffers, BufferCapabilities caps) throws AWTException(Code)
Creates a new strategy for multi-buffering on this component with the required buffer capabilities. This is useful, for example, if only accelerated memory or page flipping is desired (as specified by the buffer capabilities).

Each time this method is called, dispose will be invoked on the existing BufferStrategy.
Parameters:
  numBuffers - number of buffers to create
Parameters:
  caps - the required capabilities for creating the buffer strategy;cannot be null
exception:
  AWTException - if the capabilities supplied could not besupported or met; this may happen, for example, if there is not enoughaccelerated memory currently available, or if page flipping is specifiedbut not possible.
exception:
  IllegalArgumentException - if numBuffers is less than 1, or ifcaps is null
See Also:   Window.getBufferStrategy
See Also:   Canvas.getBufferStrategy
since:
   1.4




createHierarchyEvents
int createHierarchyEvents(int id, Component changed, Container changedParent, long changeFlags, boolean enabledOnToolkit)(Code)



createImage
public Image createImage(ImageProducer producer)(Code)
Creates an image from the specified image producer.
Parameters:
  producer - the image producer the image produced
since:
   JDK1.0



createImage
public Image createImage(int width, int height)(Code)
Creates an off-screen drawable image to be used for double buffering.
Parameters:
  width - the specified width
Parameters:
  height - the specified height an off-screen drawable image, which can be used for doublebuffering. The return value may be null if thecomponent is not displayable. This will always happen ifGraphicsEnvironment.isHeadless() returnstrue.
See Also:   Component.isDisplayable
See Also:   GraphicsEnvironment.isHeadless
since:
   JDK1.0



createVolatileImage
public VolatileImage createVolatileImage(int width, int height)(Code)
Creates a volatile off-screen drawable image to be used for double buffering.
Parameters:
  width - the specified width.
Parameters:
  height - the specified height. an off-screen drawable image, which can be used for doublebuffering. The return value may be null if thecomponent is not displayable. This will always happen ifGraphicsEnvironment.isHeadless() returnstrue.
See Also:   java.awt.image.VolatileImage
See Also:   Component.isDisplayable
See Also:   GraphicsEnvironment.isHeadless
since:
   1.4



createVolatileImage
public VolatileImage createVolatileImage(int width, int height, ImageCapabilities caps) throws AWTException(Code)
Creates a volatile off-screen drawable image, with the given capabilities. The contents of this image may be lost at any time due to operating system issues, so the image must be managed via the VolatileImage interface.
Parameters:
  width - the specified width.
Parameters:
  height - the specified height.
Parameters:
  caps - the image capabilities
exception:
  AWTException - if an image with the specified capabilities cannotbe created a VolatileImage object, which can be usedto manage surface contents loss and capabilities.
See Also:   java.awt.image.VolatileImage
since:
   1.4



deliverEvent
public void deliverEvent(Event e)(Code)



disable
public void disable()(Code)



disableEvents
final protected void disableEvents(long eventsToDisable)(Code)
Disables the events defined by the specified event mask parameter from being delivered to this component.
Parameters:
  eventsToDisable - the event mask defining the event types
See Also:   Component.enableEvents
since:
   JDK1.1



dispatchEvent
final public void dispatchEvent(AWTEvent e)(Code)
Dispatches an event to this component or one of its sub components. Calls processEvent before returning for 1.1-style events which have been enabled for the Component.
Parameters:
  e - the event



dispatchEventImpl
void dispatchEventImpl(AWTEvent e)(Code)



dispatchMouseWheelToAncestor
boolean dispatchMouseWheelToAncestor(MouseWheelEvent e)(Code)



doLayout
public void doLayout()(Code)
Prompts the layout manager to lay out this component. This is usually called when the component (more specifically, container) is validated.
See Also:   Component.validate
See Also:   LayoutManager



enable
public void enable()(Code)



enable
public void enable(boolean b)(Code)



enableEvents
final protected void enableEvents(long eventsToEnable)(Code)
Enables the events defined by the specified event mask parameter to be delivered to this component.

Event types are automatically enabled when a listener for that event type is added to the component.

This method only needs to be invoked by subclasses of Component which desire to have the specified event types delivered to processEvent regardless of whether or not a listener is registered.
Parameters:
  eventsToEnable - the event mask defining the event types
See Also:   Component.processEvent
See Also:   Component.disableEvents
See Also:   AWTEvent
since:
   JDK1.1




enableInputMethods
public void enableInputMethods(boolean enable)(Code)
Enables or disables input method support for this component. If input method support is enabled and the component also processes key events, incoming events are offered to the current input method and will only be processed by the component or dispatched to its listeners if the input method does not consume them. By default, input method support is enabled.
Parameters:
  enable - true to enable, false to disable
See Also:   Component.processKeyEvent
since:
   1.2



eventEnabled
boolean eventEnabled(AWTEvent e)(Code)



eventTypeEnabled
boolean eventTypeEnabled(int type)(Code)



findUnderMouseInWindow
Component findUnderMouseInWindow(PointerInfo pi)(Code)
Assuming that mouse location is stored in PointerInfo passed to this method, it finds a Component that is in the same Window as this Component and is located under the mouse pointer. If no such Component exists, null is returned. NOTE: this method should be called under the protection of tree lock, as it is done in Component.getMousePosition() and Container.getMousePosition(boolean).



firePropertyChange
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue)(Code)
Support for reporting bound property changes for Object properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.
Parameters:
  propertyName - the property whose value has changed
Parameters:
  oldValue - the property's previous value
Parameters:
  newValue - the property's new value



firePropertyChange
protected void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)(Code)
Support for reporting bound property changes for boolean properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.
Parameters:
  propertyName - the property whose value has changed
Parameters:
  oldValue - the property's previous value
Parameters:
  newValue - the property's new value
since:
   1.4



firePropertyChange
protected void firePropertyChange(String propertyName, int oldValue, int newValue)(Code)
Support for reporting bound property changes for integer properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.
Parameters:
  propertyName - the property whose value has changed
Parameters:
  oldValue - the property's previous value
Parameters:
  newValue - the property's new value
since:
   1.4



firePropertyChange
public void firePropertyChange(String propertyName, byte oldValue, byte newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a byte)
Parameters:
  newValue - the new value of the property (as a byte)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



firePropertyChange
public void firePropertyChange(String propertyName, char oldValue, char newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a char)
Parameters:
  newValue - the new value of the property (as a char)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



firePropertyChange
public void firePropertyChange(String propertyName, short oldValue, short newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a short)
Parameters:
  newValue - the old value of the property (as a short)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



firePropertyChange
public void firePropertyChange(String propertyName, long oldValue, long newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a long)
Parameters:
  newValue - the new value of the property (as a long)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



firePropertyChange
public void firePropertyChange(String propertyName, float oldValue, float newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a float)
Parameters:
  newValue - the new value of the property (as a float)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



firePropertyChange
public void firePropertyChange(String propertyName, double oldValue, double newValue)(Code)
Reports a bound property change.
Parameters:
  propertyName - the programmatic name of the propertythat was changed
Parameters:
  oldValue - the old value of the property (as a double)
Parameters:
  newValue - the new value of the property (as a double)
See Also:   Component.firePropertyChange(java.lang.String,java.lang.Object,java.lang.Object)
since:
   1.5



getAccessibleContext
public AccessibleContext getAccessibleContext()(Code)
Gets the AccessibleContext associated with this Component. The method implemented by this base class returns null. Classes that extend Component should implement this method to return the AccessibleContext associated with the subclass. the AccessibleContext of thisComponent
since:
   1.3



getAccessibleIndexInParent
int getAccessibleIndexInParent()(Code)
Gets the index of this object in its accessible parent. If this object does not have an accessible parent, returns -1. the index of this object in its accessible parent



getAccessibleStateSet
AccessibleStateSet getAccessibleStateSet()(Code)
Gets the current state set of this object. an instance of AccessibleStateSetcontaining the current state set of the object
See Also:   AccessibleState



getAlignmentX
public float getAlignmentX()(Code)
Returns the alignment along the x axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.



getAlignmentY
public float getAlignmentY()(Code)
Returns the alignment along the y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.



getBackBuffer
Image getBackBuffer()(Code)
the back buffer currently used by this component's BufferStrategy. If there is no BufferStrategy or noback buffer, this method returns null.



getBackground
public Color getBackground()(Code)
Gets the background color of this component. this component's background color; if this component doesnot have a background color,the background color of its parent is returned
See Also:   Component.setBackground
since:
   JDK1.0



getBaseline
public int getBaseline(int width, int height)(Code)
Returns the baseline. The baseline is measured from the top of the component. This method is primarily meant for LayoutManagers to align components along their baseline. A return value less than 0 indicates this component does not have a reasonable baseline and that LayoutManagers should not align this component on its baseline.

The default implementation returns -1. Subclasses that support baseline should override appropriately. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and getBaselineResizeBehavior can be used to determine how the baseline changes with size.
Parameters:
  width - the width to get the baseline for
Parameters:
  height - the height to get the baseline for the baseline or < 0 indicating there is no reasonablebaseline
throws:
  IllegalArgumentException - if width or height is < 0
See Also:   Component.getBaselineResizeBehavior
See Also:   java.awt.FontMetrics
since:
   1.6




getBaselineResizeBehavior
public BaselineResizeBehavior getBaselineResizeBehavior()(Code)
Returns an enum indicating how the baseline of the component changes as the size changes. This method is primarily meant for layout managers and GUI builders.

The default implementation returns BaselineResizeBehavior.OTHER. Subclasses that have a baseline should override appropriately. Subclasses should never return null; if the baseline can not be calculated return BaselineResizeBehavior.OTHER. Callers should first ask for the baseline using getBaseline and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than BaselineResizeBehavior.OTHER even if getBaseline returns a value less than 0. an enum indicating how the baseline changes as the componentsize changes
See Also:   Component.getBaseline(int,int)
since:
   1.6




getBounds
public Rectangle getBounds()(Code)
Gets the bounds of this component in the form of a Rectangle object. The bounds specify this component's width, height, and location relative to its parent. a rectangle indicating this component's bounds
See Also:   Component.setBounds
See Also:   Component.getLocation
See Also:   Component.getSize



getBounds
public Rectangle getBounds(Rectangle rv)(Code)
Stores the bounds of this component into "return value" rv and return rv. If rv is null a new Rectangle is allocated. This version of getBounds is useful if the caller wants to avoid allocating a new Rectangle object on the heap.
Parameters:
  rv - the return value, modified to the components bounds rv



getBoundsOp
int getBoundsOp()(Code)
Should only be used in subclass getBounds to check that part of bounds is actualy changing



getBufferStrategy
BufferStrategy getBufferStrategy()(Code)
the buffer strategy used by this component
See Also:   Window.createBufferStrategy
See Also:   Canvas.createBufferStrategy
since:
   1.4



getColorModel
public ColorModel getColorModel()(Code)
Gets the instance of ColorModel used to display the component on the output device. the color model used by this component
See Also:   java.awt.image.ColorModel
See Also:   java.awt.peer.ComponentPeer.getColorModel
See Also:   Toolkit.getColorModel
since:
   JDK1.0



getComponentAt
public Component getComponentAt(int x, int y)(Code)
Determines if this component or one of its immediate subcomponents contains the (xy) location, and if so, returns the containing component. This method only looks one level deep. If the point (xy) is inside a subcomponent that itself has subcomponents, it does not go looking down the subcomponent tree.

The locate method of Component simply returns the component itself if the (xy) coordinate location is inside its bounding box, and null otherwise.
Parameters:
  x - the x coordinate
Parameters:
  y - the y coordinate the component or subcomponent that contains the(xy) location;null if the locationis outside this component
See Also:   Component.contains(int,int)
since:
   JDK1.0




getComponentAt
public Component getComponentAt(Point p)(Code)
Returns the component or subcomponent that contains the specified point.
Parameters:
  p - the point
See Also:   java.awt.Component.contains
since:
   JDK1.1



getComponentListeners
public synchronized ComponentListener[] getComponentListeners()(Code)
Returns an array of all the component listeners registered on this component. all of this comonent's ComponentListenersor an empty array if no componentlisteners are currently registered
See Also:   Component.addComponentListener
See Also:   Component.removeComponentListener
since:
   1.4



getComponentOrientation
public ComponentOrientation getComponentOrientation()(Code)
Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component. LayoutManager and Component subclasses that wish to respect orientation should call this method to get the component's orientation before performing layout or drawing.
See Also:   ComponentOrientation
author:
   Laura Werner, IBM



getContainingWindow
Window getContainingWindow()(Code)
Returns the Window ancestor of the component. Window ancestor of the component or component by itself if it is Window;null, if component is not a part of window hierarchy



getContainingWindow
static Window getContainingWindow(Component comp)(Code)
Returns the Window ancestor of the component comp. Window ancestor of the component or component by itself if it is Window;null, if component is not a part of window hierarchy



getCursor
public Cursor getCursor()(Code)
Gets the cursor set in the component. If the component does not have a cursor set, the cursor of its parent is returned. If no cursor is set in the entire hierarchy, Cursor.DEFAULT_CURSOR is returned.
See Also:   Component.setCursor
since:
   JDK1.1



getCursor_NoClientCode
final Cursor getCursor_NoClientCode()(Code)



getDropTarget
public synchronized DropTarget getDropTarget()(Code)
Gets the DropTarget associated with this Component.



getFocusCycleRootAncestor
public Container getFocusCycleRootAncestor()(Code)
Returns the Container which is the focus cycle root of this Component's focus traversal cycle. Each focus traversal cycle has only a single focus cycle root and each Component which is not a Container belongs to only a single focus traversal cycle. Containers which are focus cycle roots belong to two cycles: one rooted at the Container itself, and one rooted at the Container's nearest focus-cycle-root ancestor. For such Containers, this method will return the Container's nearest focus-cycle- root ancestor. this Component's nearest focus-cycle-root ancestor
See Also:   Container.isFocusCycleRoot
since:
   1.4



getFocusListeners
public synchronized FocusListener[] getFocusListeners()(Code)
Returns an array of all the focus listeners registered on this component. all of this component's FocusListenersor an empty array if no componentlisteners are currently registered
See Also:   Component.addFocusListener
See Also:   Component.removeFocusListener
since:
   1.4



getFocusTraversalKeys
public Set<AWTKeyStroke> getFocusTraversalKeys(int id)(Code)
Returns the Set of focus traversal keys for a given traversal operation for this Component. (See setFocusTraversalKeys for a full description of each key.)

If a Set of traversal keys has not been explicitly defined for this Component, then this Component's parent's Set is returned. If no Set has been explicitly defined for any of this Component's ancestors, then the current KeyboardFocusManager's default Set is returned.
Parameters:
  id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS the Set of AWTKeyStrokes for the specified operation. The Setwill be unmodifiable, and may be empty. null will never bereturned.
See Also:   Component.setFocusTraversalKeys
See Also:   KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS
See Also:   KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS
See Also:   KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
throws:
  IllegalArgumentException - if id is not one ofKeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
since:
   1.4




getFocusTraversalKeysEnabled
public boolean getFocusTraversalKeysEnabled()(Code)
Returns whether focus traversal keys are enabled for this Component. Components for which focus traversal keys are disabled receive key events for focus traversal keys. Components for which focus traversal keys are enabled do not see these events; instead, the events are automatically converted to traversal operations. whether focus traversal keys are enabled for this Component
See Also:   Component.setFocusTraversalKeysEnabled
See Also:   Component.setFocusTraversalKeys
See Also:   Component.getFocusTraversalKeys
since:
   1.4



getFocusTraversalKeys_NoIDCheck
final Set getFocusTraversalKeys_NoIDCheck(int id)(Code)



getFont
public Font getFont()(Code)
Gets the font of this component. this component's font; if a font has not been setfor this component, the font of its parent is returned
See Also:   Component.setFont
since:
   JDK1.0



getFontMetrics
public FontMetrics getFontMetrics(Font font)(Code)
Gets the font metrics for the specified font. Warning: Since Font metrics are affected by the java.awt.font.FontRenderContext FontRenderContext and this method does not provide one, it can return only metrics for the default render context which may not match that used when rendering on the Component if Graphics2D functionality is being used. Instead metrics can be obtained at rendering time by calling Graphics.getFontMetrics or text measurement APIs on the Font Font class.
Parameters:
  font - the font for which font metrics is to be obtained the font metrics for font
See Also:   Component.getFont
See Also:   Component.getPeer
See Also:   java.awt.peer.ComponentPeer.getFontMetrics(Font)
See Also:   Toolkit.getFontMetrics(Font)
since:
   JDK1.0



getFont_NoClientCode
final Font getFont_NoClientCode()(Code)



getForeground
public Color getForeground()(Code)
Gets the foreground color of this component. this component's foreground color; if this component doesnot have a foreground color, the foreground color of its parentis returned
See Also:   Component.setForeground
since:
   JDK1.0



getGraphics
public Graphics getGraphics()(Code)
Creates a graphics context for this component. This method will return null if this component is currently not displayable. a graphics context for this component, or nullif it has none
See Also:   Component.paint
since:
   JDK1.0



getGraphicsConfiguration
public GraphicsConfiguration getGraphicsConfiguration()(Code)
Gets the GraphicsConfiguration associated with this Component. If the Component has not been assigned a specific GraphicsConfiguration, the GraphicsConfiguration of the Component object's top-level container is returned. If the Component has been created, but not yet added to a Container, this method returns null. the GraphicsConfiguration used by thisComponent or null
since:
   1.3



getGraphicsConfiguration_NoClientCode
final GraphicsConfiguration getGraphicsConfiguration_NoClientCode()(Code)



getGraphics_NoClientCode
final Graphics getGraphics_NoClientCode()(Code)



getHeight
public int getHeight()(Code)
Returns the current height of this component. This method is preferable to writing component.getBounds().height, or component.getSize().height because it doesn't cause any heap allocations. the current height of this component
since:
   1.2



getHierarchyBoundsListeners
public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners()(Code)
Returns an array of all the hierarchy bounds listeners registered on this component. all of this component's HierarchyBoundsListenersor an empty array if no hierarchy boundslisteners are currently registered
See Also:   Component.addHierarchyBoundsListener
See Also:   Component.removeHierarchyBoundsListener
since:
   1.4



getHierarchyListeners
public synchronized HierarchyListener[] getHierarchyListeners()(Code)
Returns an array of all the hierarchy listeners registered on this component. all of this component's HierarchyListenersor an empty array if no hierarchylisteners are currently registered
See Also:   Component.addHierarchyListener
See Also:   Component.removeHierarchyListener
since:
   1.4



getIgnoreRepaint
public boolean getIgnoreRepaint()(Code)
whether or not paint messages received from the operating systemshould be ignored.
since:
   1.4
See Also:   Component.setIgnoreRepaint



getInputContext
public InputContext getInputContext()(Code)
Gets the input context used by this component for handling the communication with input methods when text is entered in this component. By default, the input context used for the parent component is returned. Components may override this to return a private input context. the input context used by this component;null if no context can be determined
since:
   1.2



getInputMethodListeners
public synchronized InputMethodListener[] getInputMethodListeners()(Code)
Returns an array of all the input method listeners registered on this component. all of this component's InputMethodListenersor an empty array if no input methodlisteners are currently registered
See Also:   Component.addInputMethodListener
See Also:   Component.removeInputMethodListener
since:
   1.4



getInputMethodRequests
public InputMethodRequests getInputMethodRequests()(Code)
Gets the input method request handler which supports requests from input methods for this component. A component that supports on-the-spot text input must override this method to return an InputMethodRequests instance. At the same time, it also has to handle input method events. the input method request handler for this component,null by default
See Also:   Component.addInputMethodListener
since:
   1.2



getKeyListeners
public synchronized KeyListener[] getKeyListeners()(Code)
Returns an array of all the key listeners registered on this component. all of this component's KeyListenersor an empty array if no keylisteners are currently registered
See Also:   Component.addKeyListener
See Also:   Component.removeKeyListener
since:
   1.4



getListeners
public T[] getListeners(Class<T> listenerType)(Code)
Returns an array of all the objects currently registered as FooListeners upon this Component. FooListeners are registered using the addFooListener method.

You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a Component c for its mouse listeners with the following code:

MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));
If no such listeners exist, this method returns an empty array.
Parameters:
  listenerType - the type of listeners requested; this parametershould specify an interface that descends fromjava.util.EventListener an array of all objects registered asFooListeners on this component,or an empty array if no such listeners have been added
exception:
  ClassCastException - if listenerTypedoesn't specify a class or interface that implementsjava.util.EventListener
See Also:   Component.getComponentListeners
See Also:   Component.getFocusListeners
See Also:   Component.getHierarchyListeners
See Also:   Component.getHierarchyBoundsListeners
See Also:   Component.getKeyListeners
See Also:   Component.getMouseListeners
See Also:   Component.getMouseMotionListeners
See Also:   Component.getMouseWheelListeners
See Also:   Component.getInputMethodListeners
See Also:   Component.getPropertyChangeListeners
since:
   1.3



getLocale
public Locale getLocale()(Code)
Gets the locale of this component. this component's locale; if this component does nothave a locale, the locale of its parent is returned
See Also:   Component.setLocale
exception:
  IllegalComponentStateException - if the Componentdoes not have its own locale and has not yet been added toa containment hierarchy such that the locale can be determinedfrom the containing parent
since:
   JDK1.1



getLocation
public Point getLocation()(Code)
Gets the location of this component in the form of a point specifying the component's top-left corner. The location will be relative to the parent's coordinate space.

Due to the asynchronous nature of native event handling, this method can return outdated values (for instance, after several calls of setLocation() in rapid succession). For this reason, the recommended method of obtaining a component's position is within java.awt.event.ComponentListener.componentMoved(), which is called after the operating system has finished moving the component.

an instance of Point representingthe top-left corner of the component's bounds inthe coordinate space of the component's parent
See Also:   Component.setLocation
See Also:   Component.getLocationOnScreen
since:
   JDK1.1



getLocation
public Point getLocation(Point rv)(Code)
Stores the x,y origin of this component into "return value" rv and return rv. If rv is null a new Point is allocated. This version of getLocation is useful if the caller wants to avoid allocating a new Point object on the heap.
Parameters:
  rv - the return value, modified to the components location rv



getLocationOnScreen
public Point getLocationOnScreen()(Code)
Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space. an instance of Point representingthe top-left corner of the component's bounds in thecoordinate space of the screen IllegalComponentStateException if thecomponent is not showing on the screen
See Also:   Component.setLocation
See Also:   Component.getLocation



getLocationOnScreen_NoTreeLock
final Point getLocationOnScreen_NoTreeLock()(Code)



getMaximumSize
public Dimension getMaximumSize()(Code)
Gets the maximum size of this component. a dimension object indicating this component's maximum size
See Also:   Component.getMinimumSize
See Also:   Component.getPreferredSize
See Also:   LayoutManager



getMinimumSize
public Dimension getMinimumSize()(Code)
Gets the mininimum size of this component. a dimension object indicating this component's minimum size
See Also:   Component.getPreferredSize
See Also:   LayoutManager



getMouseListeners
public synchronized MouseListener[] getMouseListeners()(Code)
Returns an array of all the mouse listeners registered on this component. all of this component's MouseListenersor an empty array if no mouselisteners are currently registered
See Also:   Component.addMouseListener
See Also:   Component.removeMouseListener
since:
   1.4



getMouseMotionListeners
public synchronized MouseMotionListener[] getMouseMotionListeners()(Code)
Returns an array of all the mouse motion listeners registered on this component. all of this component's MouseMotionListenersor an empty array if no mouse motionlisteners are currently registered
See Also:   Component.addMouseMotionListener
See Also:   Component.removeMouseMotionListener
since:
   1.4



getMousePosition
public Point getMousePosition() throws HeadlessException(Code)
Returns the position of the mouse pointer in this Component's coordinate space if the Component is directly under the mouse pointer, otherwise returns null. If the Component is not showing on the screen, this method returns null even if the mouse pointer is above the area where the Component would be displayed. If the Component is partially or fully obscured by other Components or native windows, this method returns a non-null value only if the mouse pointer is located above the unobscured part of the Component.

For Containers it returns a non-null value if the mouse is above the Container itself or above any of its descendants. Use Container.getMousePosition(boolean) if you need to exclude children.

Sometimes the exact mouse coordinates are not important, and the only thing that matters is whether a specific Component is under the mouse pointer. If the return value of this method is null, mouse pointer is not directly above the Component.
exception:
  HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:   Component.isShowing
See Also:   Container.getMousePosition mouse coordinates relative to this Component, or null
since:
   1.5




getMouseWheelListeners
public synchronized MouseWheelListener[] getMouseWheelListeners()(Code)
Returns an array of all the mouse wheel listeners registered on this component. all of this component's MouseWheelListenersor an empty array if no mouse wheellisteners are currently registered
See Also:   Component.addMouseWheelListener
See Also:   Component.removeMouseWheelListener
since:
   1.4



getName
public String getName()(Code)
Gets the name of the component. this component's name
See Also:   Component.setName
since:
   JDK1.1



getNativeContainer
Container getNativeContainer()(Code)



getParent
public Container getParent()(Code)
Gets the parent of this component. the parent container of this component
since:
   JDK1.0



getParent_NoClientCode
final Container getParent_NoClientCode()(Code)



getPeer
public ComponentPeer getPeer()(Code)



getPreferredSize
public Dimension getPreferredSize()(Code)
Gets the preferred size of this component. a dimension object indicating this component's preferred size
See Also:   Component.getMinimumSize
See Also:   LayoutManager



getPropertyChangeListeners
public synchronized PropertyChangeListener[] getPropertyChangeListeners()(Code)
Returns an array of all the property change listeners registered on this component. all of this component's PropertyChangeListenersor an empty array if no property changelisteners are currently registered
See Also:   Component.addPropertyChangeListener
See Also:   Component.removePropertyChangeListener
See Also:   Component.getPropertyChangeListeners(java.lang.String)
See Also:   java.beans.PropertyChangeSupport.getPropertyChangeListeners
since:
   1.4



getPropertyChangeListeners
public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)(Code)
Returns an array of all the listeners which have been associated with the named property. all of the PropertyChangeListeners associated withthe named property; if no such listeners have been added orif propertyName is null, an emptyarray is returned
See Also:   Component.addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
See Also:   Component.removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
See Also:   Component.getPropertyChangeListeners
since:
   1.4



getSize
public Dimension getSize()(Code)
Returns the size of this component in the form of a Dimension object. The height field of the Dimension object contains this component's height, and the width field of the Dimension object contains this component's width. a Dimension object that indicates thesize of this component
See Also:   Component.setSize
since:
   JDK1.1



getSize
public Dimension getSize(Dimension rv)(Code)
Stores the width/height of this component into "return value" rv and return rv. If rv is null a new Dimension object is allocated. This version of getSize is useful if the caller wants to avoid allocating a new Dimension object on the heap.
Parameters:
  rv - the return value, modified to the components size rv



getToolkit
public Toolkit getToolkit()(Code)
Gets the toolkit of this component. Note that the frame that contains a component controls which toolkit is used by that component. Therefore if the component is moved from one frame to another, the toolkit it uses may change. the toolkit of this component
since:
   JDK1.0



getToolkitImpl
final Toolkit getToolkitImpl()(Code)



getTraversalRoot
Container getTraversalRoot()(Code)



getTreeLock
final public Object getTreeLock()(Code)
Gets this component's locking object (the object that owns the thread sychronization monitor) for AWT component-tree and layout operations. this component's locking object



getWidth
public int getWidth()(Code)
Returns the current width of this component. This method is preferable to writing component.getBounds().width, or component.getSize().width because it doesn't cause any heap allocations. the current width of this component
since:
   1.2



getX
public int getX()(Code)
Returns the current x coordinate of the components origin. This method is preferable to writing component.getBounds().x, or component.getLocation().x because it doesn't cause any heap allocations. the current x coordinate of the components origin
since:
   1.2



getY
public int getY()(Code)
Returns the current y coordinate of the components origin. This method is preferable to writing component.getBounds().y, or component.getLocation().y because it doesn't cause any heap allocations. the current y coordinate of the components origin
since:
   1.2



gotFocus
public boolean gotFocus(Event evt, Object what)(Code)



handleEvent
public boolean handleEvent(Event evt)(Code)



hasFocus
public boolean hasFocus()(Code)
Returns true if this Component is the focus owner. This method is obsolete, and has been replaced by isFocusOwner(). true if this Component is the focus owner; false otherwise
since:
   1.2



hide
public void hide()(Code)



imageUpdate
public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h)(Code)
Repaints the component when the image has changed. This imageUpdate method of an ImageObserver is called when more information about an image which had been previously requested using an asynchronous routine such as the drawImage method of Graphics becomes available. See the definition of imageUpdate for more information on this method and its arguments.

The imageUpdate method of Component incrementally draws an image on the component as more of the bits of the image are available.

If the system property awt.image.incrementaldraw is missing or has the value true, the image is incrementally drawn. If the system property has any other value, then the image is not drawn until it has been completely loaded.

Also, if incremental drawing is in effect, the value of the system property awt.image.redrawrate is interpreted as an integer to give the maximum redraw rate, in milliseconds. If the system property is missing or cannot be interpreted as an integer, the redraw rate is once every 100ms.

The interpretation of the x, y, width, and height arguments depends on the value of the infoflags argument.
Parameters:
  img - the image being observed
Parameters:
  infoflags - see imageUpdate for more information
Parameters:
  x - the x coordinate
Parameters:
  y - the y coordinate
Parameters:
  w - the width
Parameters:
  h - the height false if the infoflags indicate that theimage is completely loaded; true otherwise.
See Also:   java.awt.image.ImageObserver
See Also:   Graphics.drawImage(ImageintintColorjava.awt.image.ImageObserver)
See Also:   Graphics.drawImage(Imageintintjava.awt.image.ImageObserver)
See Also:   Graphics.drawImage(ImageintintintintColorjava.awt.image.ImageObserver)
See Also:   Graphics.drawImage(Imageintintintintjava.awt.image.ImageObserver)
See Also:   java.awt.image.ImageObserver.imageUpdate(java.awt.Imageintintintintint)
since:
   JDK1.0




initializeFocusTraversalKeys
void initializeFocusTraversalKeys()(Code)



inside
public boolean inside(int x, int y)(Code)



invalidate
public void invalidate()(Code)
Invalidates this component. This component and all parents above it are marked as needing to be laid out. This method can be called often, so it needs to execute quickly.
See Also:   Component.validate
See Also:   Component.doLayout
See Also:   LayoutManager
since:
   JDK1.0



isBackgroundSet
public boolean isBackgroundSet()(Code)
Returns whether the background color has been explicitly set for this Component. If this method returns false, this Component is inheriting its background color from an ancestor. true if the background color has been explicitlyset for this Component; false otherwise.
since:
   1.4



isCoalescingEnabled
final boolean isCoalescingEnabled()(Code)
Indicates whether coalesceEvents may do something.



isCursorSet
public boolean isCursorSet()(Code)
Returns whether the cursor has been explicitly set for this Component. If this method returns false, this Component is inheriting its cursor from an ancestor. true if the cursor has been explicitly set for thisComponent; false otherwise.
since:
   1.4



isDisplayable
public boolean isDisplayable()(Code)
Determines whether this component is displayable. A component is displayable when it is connected to a native screen resource.

A component is made displayable either when it is added to a displayable containment hierarchy or when its containment hierarchy is made displayable. A containment hierarchy is made displayable when its ancestor window is either packed or made visible.

A component is made undisplayable either when it is removed from a displayable containment hierarchy or when its containment hierarchy is made undisplayable. A containment hierarchy is made undisplayable when its ancestor window is disposed. true if the component is displayable, false otherwise
See Also:   Container.add(Component)
See Also:   Window.pack
See Also:   Window.show
See Also:   Container.remove(Component)
See Also:   Window.dispose
since:
   1.2




isDoubleBuffered
public boolean isDoubleBuffered()(Code)
Returns true if this component is painted to an offscreen image ("buffer") that's copied to the screen later. Component subclasses that support double buffering should override this method to return true if double buffering is enabled. false by default



isEnabled
public boolean isEnabled()(Code)
Determines whether this component is enabled. An enabled component can respond to user input and generate events. Components are enabled initially by default. A component may be enabled or disabled by calling its setEnabled method. true if the component is enabled,false otherwise
See Also:   Component.setEnabled
since:
   JDK1.0



isEnabledImpl
final boolean isEnabledImpl()(Code)



isFocusCycleRoot
public boolean isFocusCycleRoot(Container container)(Code)
Returns whether the specified Container is the focus cycle root of this Component's focus traversal cycle. Each focus traversal cycle has only a single focus cycle root and each Component which is not a Container belongs to only a single focus traversal cycle.
Parameters:
  container - the Container to be tested true if the specified Container is a focus-cycle-root of this Component; false otherwise
See Also:   Container.isFocusCycleRoot
since:
   1.4



isFocusOwner
public boolean isFocusOwner()(Code)
Returns true if this Component is the focus owner. true if this Component is the focus owner; false otherwise
since:
   1.4



isFocusTraversable
public boolean isFocusTraversable()(Code)
Returns whether this Component can become the focus owner. true if this Component isfocusable; false otherwise
See Also:   Component.setFocusable
since:
   JDK1.1



isFocusTraversableOverridden
final boolean isFocusTraversableOverridden()(Code)



isFocusable
public boolean isFocusable()(Code)
Returns whether this Component can be focused. true if this Component is focusable;false otherwise.
See Also:   Component.setFocusable
since:
   1.4



isFontSet
public boolean isFontSet()(Code)
Returns whether the font has been explicitly set for this Component. If this method returns false, this Component is inheriting its font from an ancestor. true if the font has been explicitly set for thisComponent; false otherwise.
since:
   1.4



isForegroundSet
public boolean isForegroundSet()(Code)
Returns whether the foreground color has been explicitly set for this Component. If this method returns false, this Component is inheriting its foreground color from an ancestor. true if the foreground color has been explicitlyset for this Component; false otherwise.
since:
   1.4



isInstanceOf
static boolean isInstanceOf(Object obj, String className)(Code)
Checks that the given object is instance of the given class.
Parameters:
  obj - Object to be checked
Parameters:
  className - The name of the class. Must be fully-qualified class name. true, if this object is instanceof given class,false, otherwise, or if obj or className is null



isLightweight
public boolean isLightweight()(Code)
A lightweight component doesn't have a native toolkit peer. Subclasses of Component and Container, other than the ones defined in this package like Button or Scrollbar, are lightweight. All of the Swing components are lightweights.

This method will always return false if this component is not displayable because it is impossible to determine the weight of an undisplayable component. true if this component has a lightweight peer; false ifit has a native peer or no peer
See Also:   Component.isDisplayable
since:
   1.2




isMaximumSizeSet
public boolean isMaximumSizeSet()(Code)
Returns true if the maximum size has been set to a non-null value otherwise returns false. true if maximumSize is non-null,false otherwise
since:
   1.5



isMinimumSizeSet
public boolean isMinimumSizeSet()(Code)
Returns whether or not setMinimumSize has been invoked with a non-null value. true if setMinimumSize has been invoked with anon-null value.
since:
   1.5



isOpaque
public boolean isOpaque()(Code)
Returns true if this component is completely opaque, returns false by default.

An opaque component paints every pixel within its rectangular region. A non-opaque component paints only some of its pixels, allowing the pixels underneath it to "show through". A component that does not fully paint its pixels therefore provides a degree of transparency. Only lightweight components can be transparent.

Subclasses that guarantee to always completely paint their contents should override this method and return true. All of the "heavyweight" AWT components are opaque. true if this component is completely opaque
See Also:   Component.isLightweight
since:
   1.2




isPreferredSizeSet
public boolean isPreferredSizeSet()(Code)
Returns true if the preferred size has been set to a non-null value otherwise returns false. true if setPreferredSize has been invokedwith a non-null value.
since:
   1.5



isRecursivelyVisible
boolean isRecursivelyVisible()(Code)
Determines whether this component will be displayed on the screen. true if the component and all of its ancestorsuntil a toplevel window or null parent are visible,false otherwise



isSameOrAncestorOf
boolean isSameOrAncestorOf(Component comp, boolean allowChildren)(Code)
Overridden in Container. Must be called under TreeLock.



isShowing
public boolean isShowing()(Code)
Determines whether this component is showing on screen. This means that the component must be visible, and it must be in a container that is visible and showing.

Note: sometimes there is no way to detect whether the Component is actually visible to the user. This can happen when:

  • the component has been added to a visible ScrollPane but the Component is not currently in the scroll pane's view port.
  • the Component is obscured by another Component or Container .
true if the component is showing,false otherwise
See Also:   Component.setVisible
since:
   JDK1.0



isValid
public boolean isValid()(Code)
Determines whether this component is valid. A component is valid when it is correctly sized and positioned within its parent container and all its children are also valid. In order to account for peers' size requirements, components are invalidated before they are first shown on the screen. By the time the parent container is fully realized, all its components will be valid. true if the component is valid, falseotherwise
See Also:   Component.validate
See Also:   Component.invalidate
since:
   JDK1.0



isVisible
public boolean isVisible()(Code)
Determines whether this component should be visible when its parent is visible. Components are initially visible, with the exception of top level components such as Frame objects. true if the component is visible,false otherwise
See Also:   Component.setVisible
since:
   JDK1.0



isVisible_NoClientCode
final boolean isVisible_NoClientCode()(Code)



keyDown
public boolean keyDown(Event evt, int key)(Code)



keyUp
public boolean keyUp(Event evt, int key)(Code)



layout
public void layout()(Code)



lightweightPaint
void lightweightPaint(Graphics g)(Code)
Simulates the peer callbacks into java.awt for painting of lightweight Components.
Parameters:
  g - the graphics context to use for painting
See Also:   Component.paintAll



lightweightPrint
void lightweightPrint(Graphics g)(Code)
Simulates the peer callbacks into java.awt for printing of lightweight Components.
Parameters:
  g - the graphics context to use for printing
See Also:   Component.printAll



list
public void list()(Code)
Prints a listing of this component to the standard system output stream System.out.
See Also:   java.lang.System.out
since:
   JDK1.0



list
public void list(PrintStream out)(Code)
Prints a listing of this component to the specified output stream.
Parameters:
  out - a print stream
since:
   JDK1.0



list
public void list(PrintStream out, int indent)(Code)
Prints out a list, starting at the specified indentation, to the specified print stream.
Parameters:
  out - a print stream
Parameters:
  indent - number of spaces to indent
See Also:   java.io.PrintStream.println(java.lang.Object)
since:
   JDK1.0



list
public void list(PrintWriter out)(Code)
Prints a listing to the specified print writer.
Parameters:
  out - the print writer to print to
since:
   JDK1.1



list
public void list(PrintWriter out, int indent)(Code)
Prints out a list, starting at the specified indentation, to the specified print writer.
Parameters:
  out - the print writer to print to
Parameters:
  indent - the number of spaces to indent
See Also:   java.io.PrintStream.println(java.lang.Object)
since:
   JDK1.1



locate
public Component locate(int x, int y)(Code)



location
public Point location()(Code)



lostFocus
public boolean lostFocus(Event evt, Object what)(Code)



minimumSize
public Dimension minimumSize()(Code)



mouseDown
public boolean mouseDown(Event evt, int x, int y)(Code)



mouseDrag
public boolean mouseDrag(Event evt, int x, int y)(Code)



mouseEnter
public boolean mouseEnter(Event evt, int x, int y)(Code)



mouseExit
public boolean mouseExit(Event evt, int x, int y)(Code)



mouseMove
public boolean mouseMove(Event evt, int x, int y)(Code)



mouseUp
public boolean mouseUp(Event evt, int x, int y)(Code)



move
public void move(int x, int y)(Code)



nextFocus
public void nextFocus()(Code)



numListening
int numListening(long mask)(Code)



paint
public void paint(Graphics g)(Code)
Paints this component.

This method is called when the contents of the component should be painted; such as when the component is first being shown or is damaged and in need of repair. The clip rectangle in the Graphics parameter is set to the area which needs to be painted. Subclasses of Component that override this method need not call super.paint(g).

For performance reasons, Components with zero width or height aren't considered to need painting when they are first shown, and also aren't considered to need repair.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
Parameters:
  g - the graphics context to use for painting
See Also:   Component.update
since:
   JDK1.0




paintAll
public void paintAll(Graphics g)(Code)
Paints this component and all of its subcomponents.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component.
Parameters:
  g - the graphics context to use for painting
See Also:   Component.paint
since:
   JDK1.0




paintHeavyweightComponents
void paintHeavyweightComponents(Graphics g)(Code)
Paints all the heavyweight subcomponents.



paramString
protected String paramString()(Code)
Returns a string representing the state of this component. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null. a string representation of this component's state
since:
   JDK1.0



pointRelativeToComponent
Point pointRelativeToComponent(Point absolute)(Code)
Translates absolute coordinates into coordinates in the coordinate space of this component.



postEvent
public boolean postEvent(Event e)(Code)



postNextFocusHelper
static boolean postNextFocusHelper(Component toFocus, CausedFocusEvent.Cause cause)(Code)



postsOldMouseEvents
boolean postsOldMouseEvents()(Code)



preNextFocusHelper
final Component preNextFocusHelper()(Code)



preferredSize
public Dimension preferredSize()(Code)



prepareImage
public boolean prepareImage(Image image, ImageObserver observer)(Code)
Prepares an image for rendering on this component. The image data is downloaded asynchronously in another thread and the appropriate screen representation of the image is generated.
Parameters:
  image - the Image for which toprepare a screen representation
Parameters:
  observer - the ImageObserver objectto be notified as the image is being prepared true if the image has already been fullyprepared; false otherwise
since:
   JDK1.0



prepareImage
public boolean prepareImage(Image image, int width, int height, ImageObserver observer)(Code)
Prepares an image for rendering on this component at the specified width and height.

The image data is downloaded asynchronously in another thread, and an appropriately scaled screen representation of the image is generated.
Parameters:
  image - the instance of Imagefor which to prepare a screen representation
Parameters:
  width - the width of the desired screen representation
Parameters:
  height - the height of the desired screen representation
Parameters:
  observer - the ImageObserver objectto be notified as the image is being prepared true if the image has already been fully prepared; false otherwise
See Also:   java.awt.image.ImageObserver
since:
   JDK1.0




print
public void print(Graphics g)(Code)
Prints this component. Applications should override this method for components that must do special processing before being printed or should be printed differently than they are painted.

The default implementation of this method calls the paint method.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component.
Parameters:
  g - the graphics context to use for printing
See Also:   Component.paint(Graphics)
since:
   JDK1.0




printAll
public void printAll(Graphics g)(Code)
Prints this component and all of its subcomponents.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component.
Parameters:
  g - the graphics context to use for printing
See Also:   Component.print(Graphics)
since:
   JDK1.0




printHeavyweightComponents
void printHeavyweightComponents(Graphics g)(Code)
Prints all the heavyweight subcomponents.



processComponentEvent
protected void processComponentEvent(ComponentEvent e)(Code)
Processes component events occurring on this component by dispatching them to any registered ComponentListener objects.

This method is not called unless component events are enabled for this component. Component events are enabled when one of the following occurs:

  • A ComponentListener object is registered via addComponentListener.
  • Component events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the component event
See Also:   java.awt.event.ComponentEvent
See Also:   java.awt.event.ComponentListener
See Also:   Component.addComponentListener
See Also:   Component.enableEvents
since:
   JDK1.1




processEvent
protected void processEvent(AWTEvent e)(Code)
Processes events occurring on this component. By default this method calls the appropriate process<event type>Event method for the given class of event.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the event
See Also:   Component.processComponentEvent
See Also:   Component.processFocusEvent
See Also:   Component.processKeyEvent
See Also:   Component.processMouseEvent
See Also:   Component.processMouseMotionEvent
See Also:   Component.processInputMethodEvent
See Also:   Component.processHierarchyEvent
See Also:   Component.processMouseWheelEvent
since:
   JDK1.1




processFocusEvent
protected void processFocusEvent(FocusEvent e)(Code)
Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.

This method is not called unless focus events are enabled for this component. Focus events are enabled when one of the following occurs:

  • A FocusListener object is registered via addFocusListener.
  • Focus events are enabled via enableEvents.

If focus events are enabled for a Component, the current KeyboardFocusManager determines whether or not a focus event should be dispatched to registered FocusListener objects. If the events are to be dispatched, the KeyboardFocusManager calls the Component's dispatchEvent method, which results in a call to the Component's processFocusEvent method.

If focus events are enabled for a Component, calling the Component's dispatchEvent method with a FocusEvent as the argument will result in a call to the Component's processFocusEvent method regardless of the current KeyboardFocusManager.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the focus event
See Also:   java.awt.event.FocusEvent
See Also:   java.awt.event.FocusListener
See Also:   java.awt.KeyboardFocusManager
See Also:   Component.addFocusListener
See Also:   Component.enableEvents
See Also:   Component.dispatchEvent
since:
   JDK1.1




processHierarchyBoundsEvent
protected void processHierarchyBoundsEvent(HierarchyEvent e)(Code)
Processes hierarchy bounds events occurring on this component by dispatching them to any registered HierarchyBoundsListener objects.

This method is not called unless hierarchy bounds events are enabled for this component. Hierarchy bounds events are enabled when one of the following occurs:

  • An HierarchyBoundsListener object is registered via addHierarchyBoundsListener.
  • Hierarchy bounds events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the hierarchy event
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyBoundsListener
See Also:   Component.addHierarchyBoundsListener
See Also:   Component.enableEvents
since:
   1.3




processHierarchyEvent
protected void processHierarchyEvent(HierarchyEvent e)(Code)
Processes hierarchy events occurring on this component by dispatching them to any registered HierarchyListener objects.

This method is not called unless hierarchy events are enabled for this component. Hierarchy events are enabled when one of the following occurs:

  • An HierarchyListener object is registered via addHierarchyListener.
  • Hierarchy events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the hierarchy event
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyListener
See Also:   Component.addHierarchyListener
See Also:   Component.enableEvents
since:
   1.3




processInputMethodEvent
protected void processInputMethodEvent(InputMethodEvent e)(Code)
Processes input method events occurring on this component by dispatching them to any registered InputMethodListener objects.

This method is not called unless input method events are enabled for this component. Input method events are enabled when one of the following occurs:

  • An InputMethodListener object is registered via addInputMethodListener.
  • Input method events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the input method event
See Also:   java.awt.event.InputMethodEvent
See Also:   java.awt.event.InputMethodListener
See Also:   Component.addInputMethodListener
See Also:   Component.enableEvents
since:
   1.2




processKeyEvent
protected void processKeyEvent(KeyEvent e)(Code)
Processes key events occurring on this component by dispatching them to any registered KeyListener objects.

This method is not called unless key events are enabled for this component. Key events are enabled when one of the following occurs:

  • A KeyListener object is registered via addKeyListener.
  • Key events are enabled via enableEvents.

If key events are enabled for a Component, the current KeyboardFocusManager determines whether or not a key event should be dispatched to registered KeyListener objects. The DefaultKeyboardFocusManager will not dispatch key events to a Component that is not the focus owner or is not showing.

As of J2SE 1.4, KeyEvents are redirected to the focus owner. Please see the Focus Specification for further information.

Calling a Component's dispatchEvent method with a KeyEvent as the argument will result in a call to the Component's processKeyEvent method regardless of the current KeyboardFocusManager as long as the component is showing, focused, and enabled, and key events are enabled on it.

If the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the key event
See Also:   java.awt.event.KeyEvent
See Also:   java.awt.event.KeyListener
See Also:   java.awt.KeyboardFocusManager
See Also:   java.awt.DefaultKeyboardFocusManager
See Also:   Component.processEvent
See Also:   Component.dispatchEvent
See Also:   Component.addKeyListener
See Also:   Component.enableEvents
See Also:   Component.isShowing
since:
   JDK1.1




processMouseEvent
protected void processMouseEvent(MouseEvent e)(Code)
Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects.

This method is not called unless mouse events are enabled for this component. Mouse events are enabled when one of the following occurs:

  • A MouseListener object is registered via addMouseListener.
  • Mouse events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the mouse event
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseListener
See Also:   Component.addMouseListener
See Also:   Component.enableEvents
since:
   JDK1.1




processMouseMotionEvent
protected void processMouseMotionEvent(MouseEvent e)(Code)
Processes mouse motion events occurring on this component by dispatching them to any registered MouseMotionListener objects.

This method is not called unless mouse motion events are enabled for this component. Mouse motion events are enabled when one of the following occurs:

  • A MouseMotionListener object is registered via addMouseMotionListener.
  • Mouse motion events are enabled via enableEvents.

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the mouse motion event
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseMotionListener
See Also:   Component.addMouseMotionListener
See Also:   Component.enableEvents
since:
   JDK1.1




processMouseWheelEvent
protected void processMouseWheelEvent(MouseWheelEvent e)(Code)
Processes mouse wheel events occurring on this component by dispatching them to any registered MouseWheelListener objects.

This method is not called unless mouse wheel events are enabled for this component. Mouse wheel events are enabled when one of the following occurs:

  • A MouseWheelListener object is registered via addMouseWheelListener.
  • Mouse wheel events are enabled via enableEvents.

For information on how mouse wheel events are dispatched, see the class description for MouseWheelEvent .

Note that if the event parameter is null the behavior is unspecified and may result in an exception.
Parameters:
  e - the mouse wheel event
See Also:   java.awt.event.MouseWheelEvent
See Also:   java.awt.event.MouseWheelListener
See Also:   Component.addMouseWheelListener
See Also:   Component.enableEvents
since:
   1.4




remove
public void remove(MenuComponent popup)(Code)
Removes the specified popup menu from the component.
Parameters:
  popup - the popup menu to be removed
See Also:   Component.add(PopupMenu)
since:
   JDK1.1



removeComponentListener
public synchronized void removeComponentListener(ComponentListener l)(Code)
Removes the specified component listener so that it no longer receives component events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the component listener
See Also:   java.awt.event.ComponentEvent
See Also:   java.awt.event.ComponentListener
See Also:   Component.addComponentListener
See Also:   Component.getComponentListeners
since:
   JDK1.1




removeFocusListener
public synchronized void removeFocusListener(FocusListener l)(Code)
Removes the specified focus listener so that it no longer receives focus events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the focus listener
See Also:   java.awt.event.FocusEvent
See Also:   java.awt.event.FocusListener
See Also:   Component.addFocusListener
See Also:   Component.getFocusListeners
since:
   JDK1.1




removeHierarchyBoundsListener
public void removeHierarchyBoundsListener(HierarchyBoundsListener l)(Code)
Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the hierarchy bounds listener
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyBoundsListener
See Also:   Component.addHierarchyBoundsListener
See Also:   Component.getHierarchyBoundsListeners
since:
   1.3




removeHierarchyListener
public void removeHierarchyListener(HierarchyListener l)(Code)
Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the hierarchy listener
See Also:   java.awt.event.HierarchyEvent
See Also:   java.awt.event.HierarchyListener
See Also:   Component.addHierarchyListener
See Also:   Component.getHierarchyListeners
since:
   1.3




removeInputMethodListener
public synchronized void removeInputMethodListener(InputMethodListener l)(Code)
Removes the specified input method listener so that it no longer receives input method events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the input method listener
See Also:   java.awt.event.InputMethodEvent
See Also:   java.awt.event.InputMethodListener
See Also:   Component.addInputMethodListener
See Also:   Component.getInputMethodListeners
since:
   1.2




removeKeyListener
public synchronized void removeKeyListener(KeyListener l)(Code)
Removes the specified key listener so that it no longer receives key events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the key listener
See Also:   java.awt.event.KeyEvent
See Also:   java.awt.event.KeyListener
See Also:   Component.addKeyListener
See Also:   Component.getKeyListeners
since:
   JDK1.1




removeMouseListener
public synchronized void removeMouseListener(MouseListener l)(Code)
Removes the specified mouse listener so that it no longer receives mouse events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse listener
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseListener
See Also:   Component.addMouseListener
See Also:   Component.getMouseListeners
since:
   JDK1.1




removeMouseMotionListener
public synchronized void removeMouseMotionListener(MouseMotionListener l)(Code)
Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If listener l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse motion listener
See Also:   java.awt.event.MouseEvent
See Also:   java.awt.event.MouseMotionListener
See Also:   Component.addMouseMotionListener
See Also:   Component.getMouseMotionListeners
since:
   JDK1.1




removeMouseWheelListener
public synchronized void removeMouseWheelListener(MouseWheelListener l)(Code)
Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this component. If l is null, no exception is thrown and no action is performed.

Refer to AWT Threading Issues for details on AWT's threading model.
Parameters:
  l - the mouse wheel listener.
See Also:   java.awt.event.MouseWheelEvent
See Also:   java.awt.event.MouseWheelListener
See Also:   Component.addMouseWheelListener
See Also:   Component.getMouseWheelListeners
since:
   1.4




removeNotify
public void removeNotify()(Code)
Makes this Component undisplayable by destroying it native screen resource.

This method is called by the toolkit internally and should not be called directly by programs. Code overriding this method should call super.removeNotify as the first line of the overriding method.
See Also:   Component.isDisplayable
See Also:   Component.addNotify
since:
   JDK1.0




removePropertyChangeListener
public synchronized void removePropertyChangeListener(PropertyChangeListener listener)(Code)
Removes a PropertyChangeListener from the listener list. This method should be used to remove PropertyChangeListeners that were registered for all bound properties of this class.

If listener is null, no exception is thrown and no action is performed.
Parameters:
  listener - the PropertyChangeListener to be removed
See Also:   Component.addPropertyChangeListener
See Also:   Component.getPropertyChangeListeners
See Also:   Component.removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)




removePropertyChangeListener
public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)
Removes a PropertyChangeListener from the listener list for a specific property. This method should be used to remove PropertyChangeListeners that were registered for a specific bound property.

If propertyName or listener is null, no exception is thrown and no action is taken.
Parameters:
  propertyName - a valid property name
Parameters:
  listener - the PropertyChangeListener to be removed
See Also:   Component.addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
See Also:   Component.getPropertyChangeListeners(java.lang.String)
See Also:   Component.removePropertyChangeListener(java.beans.PropertyChangeListener)




repaint
public void repaint()(Code)
Repaints this component.

If this component is a lightweight component, this method causes a call to this component's paint method as soon as possible. Otherwise, this method causes a call to this component's update method as soon as possible.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
See Also:   Component.update(Graphics)
since:
   JDK1.0




repaint
public void repaint(long tm)(Code)
Repaints the component. If this component is a lightweight component, this results in a call to paint within tm milliseconds.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
Parameters:
  tm - maximum time in milliseconds before update
See Also:   Component.paint
See Also:   Component.update(Graphics)
since:
   JDK1.0




repaint
public void repaint(int x, int y, int width, int height)(Code)
Repaints the specified rectangle of this component.

If this component is a lightweight component, this method causes a call to this component's paint method as soon as possible. Otherwise, this method causes a call to this component's update method as soon as possible.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
Parameters:
  x - the x coordinate
Parameters:
  y - the y coordinate
Parameters:
  width - the width
Parameters:
  height - the height
See Also:   Component.update(Graphics)
since:
   JDK1.0




repaint
public void repaint(long tm, int x, int y, int width, int height)(Code)
Repaints the specified rectangle of this component within tm milliseconds.

If this component is a lightweight component, this method causes a call to this component's paint method. Otherwise, this method causes a call to this component's update method.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
Parameters:
  tm - maximum time in milliseconds before update
Parameters:
  x - the x coordinate
Parameters:
  y - the y coordinate
Parameters:
  width - the width
Parameters:
  height - the height
See Also:   Component.update(Graphics)
since:
   JDK1.0




requestFocus
public void requestFocus()(Code)
Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this Component is the focus owner until this Component receives a FOCUS_GAINED event. If this request is denied because this Component's top-level Window cannot become the focused Window, the request will be remembered and will be granted when the Window is later focused by the user.

This method cannot be used to set the focus owner to no Component at all. Use KeyboardFocusManager.clearGlobalFocusOwner() instead.

Because the focus behavior of this method is platform-dependent, developers are strongly encouraged to use requestFocusInWindow when possible.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.
See Also:   Component.requestFocusInWindow
See Also:   java.awt.event.FocusEvent
See Also:   Component.addFocusListener
See Also:   Component.isFocusable
See Also:   Component.isDisplayable
See Also:   KeyboardFocusManager.clearGlobalFocusOwner
since:
   JDK1.0




requestFocus
void requestFocus(CausedFocusEvent.Cause cause)(Code)



requestFocus
protected boolean requestFocus(boolean temporary)(Code)
Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event. If this request is denied because this component's top-level window cannot become the focused window, the request will be remembered and will be granted when the window is later focused by the user.

This method returns a boolean value. If false is returned, the request is guaranteed to fail. If true is returned, the request will succeed unless it is vetoed, or an extraordinary event, such as disposal of the component's peer, occurs before the request can be granted by the native windowing system. Again, while a return value of true indicates that the request is likely to succeed, developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no component at all. Use KeyboardFocusManager.clearGlobalFocusOwner instead.

Because the focus behavior of this method is platform-dependent, developers are strongly encouraged to use requestFocusInWindow when possible.

Every effort will be made to ensure that FocusEvents generated as a result of this request will have the specified temporary value. However, because specifying an arbitrary temporary state may not be implementable on all native windowing systems, correct behavior for this method can be guaranteed only for lightweight Components. This method is not intended for general use, but exists instead as a hook for lightweight component libraries, such as Swing.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.
Parameters:
  temporary - true if the focus change is temporary,such as when the window loses the focus; formore information on temporary focus changes see theFocus Specification false if the focus change request is guaranteed tofail; true if it is likely to succeed
See Also:   java.awt.event.FocusEvent
See Also:   Component.addFocusListener
See Also:   Component.isFocusable
See Also:   Component.isDisplayable
See Also:   KeyboardFocusManager.clearGlobalFocusOwner
since:
   1.4




requestFocus
boolean requestFocus(boolean temporary, CausedFocusEvent.Cause cause)(Code)



requestFocusHelper
final boolean requestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed)(Code)



requestFocusHelper
final boolean requestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed, CausedFocusEvent.Cause cause)(Code)



requestFocusInWindow
public boolean requestFocusInWindow()(Code)
Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this Component is the focus owner until this Component receives a FOCUS_GAINED event.

This method returns a boolean value. If false is returned, the request is guaranteed to fail. If true is returned, the request will succeed unless it is vetoed, or an extraordinary event, such as disposal of the Component's peer, occurs before the request can be granted by the native windowing system. Again, while a return value of true indicates that the request is likely to succeed, developers must never assume that this Component is the focus owner until this Component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no Component at all. Use KeyboardFocusManager.clearGlobalFocusOwner() instead.

The focus behavior of this method can be implemented uniformly across platforms, and thus developers are strongly encouraged to use this method over requestFocus when possible. Code which relies on requestFocus may exhibit different focus behavior on different platforms.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked. false if the focus change request is guaranteed tofail; true if it is likely to succeed
See Also:   Component.requestFocus
See Also:   java.awt.event.FocusEvent
See Also:   Component.addFocusListener
See Also:   Component.isFocusable
See Also:   Component.isDisplayable
See Also:   KeyboardFocusManager.clearGlobalFocusOwner
since:
   1.4




requestFocusInWindow
boolean requestFocusInWindow(CausedFocusEvent.Cause cause)(Code)



requestFocusInWindow
protected boolean requestFocusInWindow(boolean temporary)(Code)
Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window. This component must be displayable, focusable, visible and all of its ancestors (with the exception of the top-level Window) must be visible for the request to be granted. Every effort will be made to honor the request; however, in some cases it may be impossible to do so. Developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event.

This method returns a boolean value. If false is returned, the request is guaranteed to fail. If true is returned, the request will succeed unless it is vetoed, or an extraordinary event, such as disposal of the component's peer, occurs before the request can be granted by the native windowing system. Again, while a return value of true indicates that the request is likely to succeed, developers must never assume that this component is the focus owner until this component receives a FOCUS_GAINED event.

This method cannot be used to set the focus owner to no component at all. Use KeyboardFocusManager.clearGlobalFocusOwner instead.

The focus behavior of this method can be implemented uniformly across platforms, and thus developers are strongly encouraged to use this method over requestFocus when possible. Code which relies on requestFocus may exhibit different focus behavior on different platforms.

Every effort will be made to ensure that FocusEvents generated as a result of this request will have the specified temporary value. However, because specifying an arbitrary temporary state may not be implementable on all native windowing systems, correct behavior for this method can be guaranteed only for lightweight components. This method is not intended for general use, but exists instead as a hook for lightweight component libraries, such as Swing.

Note: Not all focus transfers result from invoking this method. As such, a component may receive focus without this or any of the other requestFocus methods of Component being invoked.
Parameters:
  temporary - true if the focus change is temporary,such as when the window loses the focus; formore information on temporary focus changes see theFocus Specification false if the focus change request is guaranteed tofail; true if it is likely to succeed
See Also:   Component.requestFocus
See Also:   java.awt.event.FocusEvent
See Also:   Component.addFocusListener
See Also:   Component.isFocusable
See Also:   Component.isDisplayable
See Also:   KeyboardFocusManager.clearGlobalFocusOwner
since:
   1.4




requestFocusInWindow
boolean requestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause)(Code)



resetGC
void resetGC()(Code)
Resets this Component's GraphicsConfiguration back to a default value. For most componenets, this is null. Called from the Toolkit thread, so NO CLIENT CODE.



reshape
public void reshape(int x, int y, int width, int height)(Code)



resize
public void resize(int width, int height)(Code)



resize
public void resize(Dimension d)(Code)



setBackground
public void setBackground(Color c)(Code)
Sets the background color of this component.

The background color affects each component differently and the parts of the component that are affected by the background color may differ between operating systems.
Parameters:
  c - the color to become this component's color;if this parameter is null, then thiscomponent will inherit the background color of its parent
See Also:   Component.getBackground
since:
   JDK1.0




setBounds
public void setBounds(int x, int y, int width, int height)(Code)
Moves and resizes this component. The new location of the top-left corner is specified by x and y, and the new size is specified by width and height.
Parameters:
  x - the new x-coordinate of this component
Parameters:
  y - the new y-coordinate of this component
Parameters:
  width - the new width of this component
Parameters:
  height - the new height of this component
See Also:   Component.getBounds
See Also:   Component.setLocation(int,int)
See Also:   Component.setLocation(Point)
See Also:   Component.setSize(int,int)
See Also:   Component.setSize(Dimension)
since:
   JDK1.1



setBounds
public void setBounds(Rectangle r)(Code)
Moves and resizes this component to conform to the new bounding rectangle r. This component's new position is specified by r.x and r.y, and its new size is specified by r.width and r.height
Parameters:
  r - the new bounding rectangle for this component
See Also:   Component.getBounds
See Also:   Component.setLocation(int,int)
See Also:   Component.setLocation(Point)
See Also:   Component.setSize(int,int)
See Also:   Component.setSize(Dimension)
since:
   JDK1.1



setBoundsOp
void setBoundsOp(int op)(Code)



setComponentOrientation
public void setComponentOrientation(ComponentOrientation o)(Code)
Sets the language-sensitive orientation that is to be used to order the elements or text within this component. Language-sensitive LayoutManager and Component subclasses will use this property to determine how to lay out and draw components.

At construction time, a component's orientation is set to ComponentOrientation.UNKNOWN, indicating that it has not been specified explicitly. The UNKNOWN orientation behaves the same as ComponentOrientation.LEFT_TO_RIGHT.

To set the orientation of a single component, use this method. To set the orientation of an entire component hierarchy, use Component.applyComponentOrientation applyComponentOrientation .
See Also:   ComponentOrientation
author:
   Laura Werner, IBM




setCursor
public void setCursor(Cursor cursor)(Code)
Sets the cursor image to the specified cursor. This cursor image is displayed when the contains method for this component returns true for the current cursor location, and this Component is visible, displayable, and enabled. Setting the cursor of a Container causes that cursor to be displayed within all of the container's subcomponents, except for those that have a non-null cursor.

The method may have no visual effect if the Java platform implementation and/or the native system do not support changing the mouse cursor shape.
Parameters:
  cursor - One of the constants defined by the Cursor class;if this parameter is nullthen this component will inheritthe cursor of its parent
See Also:   Component.isEnabled
See Also:   Component.isShowing
See Also:   Component.getCursor
See Also:   Component.contains
See Also:   Toolkit.createCustomCursor
See Also:   Cursor
since:
   JDK1.1




setDropTarget
public synchronized void setDropTarget(DropTarget dt)(Code)
Associate a DropTarget with this component. The Component will receive drops only if it is enabled.
See Also:   Component.isEnabled
Parameters:
  dt - The DropTarget



setEnabled
public void setEnabled(boolean b)(Code)
Enables or disables this component, depending on the value of the parameter b. An enabled component can respond to user input and generate events. Components are enabled initially by default.

Note: Disabling a lightweight component does not prevent it from receiving MouseEvents.

Note: Disabling a heavyweight container prevents all components in this container from receiving any input events. But disabling a lightweight container affects only this container.
Parameters:
  b - If true, this component is enabled; otherwise this component is disabled
See Also:   Component.isEnabled
See Also:   Component.isLightweight
since:
   JDK1.1




setFocusTraversalKeys
public void setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes)(Code)
Sets the focus traversal keys for a given traversal operation for this Component.

The default values for a Component's focus traversal keys are implementation-dependent. Sun recommends that all implementations for a particular native platform use the same default values. The recommendations for Windows and Unix are listed below. These recommendations are used in the Sun AWT implementations.
Identifier Meaning Default
KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS Normal forward keyboard traversal TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS Normal reverse keyboard traversal SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED
KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS Go up one focus traversal cycle none
To disable a traversal key, use an empty Set; Collections.EMPTY_SET is recommended.

Using the AWTKeyStroke API, client code can specify on which of two specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal operation will occur. Regardless of which KeyEvent is specified, however, all KeyEvents related to the focus traversal key, including the associated KEY_TYPED event, will be consumed, and will not be dispatched to any Component. It is a runtime error to specify a KEY_TYPED event as mapping to a focus traversal operation, or to map the same event to multiple default focus traversal operations.

If a value of null is specified for the Set, this Component inherits the Set from its parent. If all ancestors of this Component have null specified for the Set, then the current KeyboardFocusManager's default Set is used.
Parameters:
  id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
Parameters:
  keystrokes - the Set of AWTKeyStroke for the specified operation
See Also:   Component.getFocusTraversalKeys
See Also:   KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS
See Also:   KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS
See Also:   KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
throws:
  IllegalArgumentException - if id is not one ofKeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, orKeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokescontains null, or if any Object in keystrokes is not anAWTKeyStroke, or if any keystroke represents a KEY_TYPED event,or if any keystroke already maps to another focus traversaloperation for this Component
since:
   1.4




setFocusTraversalKeysEnabled
public void setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)(Code)
Sets whether focus traversal keys are enabled for this Component. Components for which focus traversal keys are disabled receive key events for focus traversal keys. Components for which focus traversal keys are enabled do not see these events; instead, the events are automatically converted to traversal operations.
Parameters:
  focusTraversalKeysEnabled - whether focus traversal keys areenabled for this Component
See Also:   Component.getFocusTraversalKeysEnabled
See Also:   Component.setFocusTraversalKeys
See Also:   Component.getFocusTraversalKeys
since:
   1.4



setFocusTraversalKeys_NoIDCheck
final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes)(Code)



setFocusable
public void setFocusable(boolean focusable)(Code)
Sets the focusable state of this Component to the specified value. This value overrides the Component's default focusability.
Parameters:
  focusable - indicates whether this Component is focusable
See Also:   Component.isFocusable
since:
   1.4



setFont
public void setFont(Font f)(Code)
Sets the font of this component.
Parameters:
  f - the font to become this component's font;if this parameter is null then thiscomponent will inherit the font of its parent
See Also:   Component.getFont
since:
   JDK1.0



setForeground
public void setForeground(Color c)(Code)
Sets the foreground color of this component.
Parameters:
  c - the color to become this component's foreground color; if this parameter is nullthen this component will inheritthe foreground color of its parent
See Also:   Component.getForeground
since:
   JDK1.0



setGCFromPeer
void setGCFromPeer()(Code)



setIgnoreRepaint
public void setIgnoreRepaint(boolean ignoreRepaint)(Code)
Sets whether or not paint messages received from the operating system should be ignored. This does not affect paint events generated in software by the AWT, unless they are an immediate response to an OS-level paint message.

This is useful, for example, if running under full-screen mode and better performance is desired, or if page-flipping is used as the buffer strategy.
since:
   1.4
See Also:   Component.getIgnoreRepaint
See Also:   Canvas.createBufferStrategy
See Also:   Window.createBufferStrategy
See Also:   java.awt.image.BufferStrategy
See Also:   GraphicsDevice.setFullScreenWindow




setLocale
public void setLocale(Locale l)(Code)
Sets the locale of this component. This is a bound property.
Parameters:
  l - the locale to become this component's locale
See Also:   Component.getLocale
since:
   JDK1.1



setLocation
public void setLocation(int x, int y)(Code)
Moves this component to a new location. The top-left corner of the new location is specified by the x and y parameters in the coordinate space of this component's parent.
Parameters:
  x - the x-coordinate of the new location's top-left corner in the parent's coordinate space
Parameters:
  y - the y-coordinate of the new location's top-left corner in the parent's coordinate space
See Also:   Component.getLocation
See Also:   Component.setBounds
since:
   JDK1.1



setLocation
public void setLocation(Point p)(Code)
Moves this component to a new location. The top-left corner of the new location is specified by point p. Point p is given in the parent's coordinate space.
Parameters:
  p - the point defining the top-left corner of the new location, given in the coordinate space of this component's parent
See Also:   Component.getLocation
See Also:   Component.setBounds
since:
   JDK1.1



setMaximumSize
public void setMaximumSize(Dimension maximumSize)(Code)
Sets the maximum size of this component to a constant value. Subsequent calls to getMaximumSize will always return this value. Setting the maximum size to null restores the default behavior.
Parameters:
  maximumSize - a Dimension containing the desired maximum allowable size
See Also:   Component.getMaximumSize
See Also:   Component.isMaximumSizeSet
since:
   1.5



setMinimumSize
public void setMinimumSize(Dimension minimumSize)(Code)
Sets the minimum size of this component to a constant value. Subsequent calls to getMinimumSize will always return this value. Setting the minimum size to null restores the default behavior.
Parameters:
  minimumSize - the new minimum size of this component
See Also:   Component.getMinimumSize
See Also:   Component.isMinimumSizeSet
since:
   1.5



setName
public void setName(String name)(Code)
Sets the name of the component to the specified string.
Parameters:
  name - the string that is to be this component's name
See Also:   Component.getName
since:
   JDK1.1



setPreferredSize
public void setPreferredSize(Dimension preferredSize)(Code)
Sets the preferred size of this component to a constant value. Subsequent calls to getPreferredSize will always return this value. Setting the preferred size to null restores the default behavior.
Parameters:
  preferredSize - The new preferred size, or null
See Also:   Component.getPreferredSize
See Also:   Component.isPreferredSizeSet
since:
   1.5



setRequestFocusController
static synchronized void setRequestFocusController(RequestFocusController requestController)(Code)



setSize
public void setSize(int width, int height)(Code)
Resizes this component so that it has width width and height height.
Parameters:
  width - the new width of this component in pixels
Parameters:
  height - the new height of this component in pixels
See Also:   Component.getSize
See Also:   Component.setBounds
since:
   JDK1.1



setSize
public void setSize(Dimension d)(Code)
Resizes this component so that it has width d.width and height d.height.
Parameters:
  d - the dimension specifying the new size of this component
See Also:   Component.setSize
See Also:   Component.setBounds
since:
   JDK1.1



setVisible
public void setVisible(boolean b)(Code)
Shows or hides this component depending on the value of parameter b.
Parameters:
  b - if true, shows this component;otherwise, hides this component
See Also:   Component.isVisible
since:
   JDK1.1



show
public void show()(Code)



show
public void show(boolean b)(Code)



size
public Dimension size()(Code)



toString
public String toString()(Code)
Returns a string representation of this component and its values. a string representation of this component
since:
   JDK1.0



transferFocus
public void transferFocus()(Code)
Transfers the focus to the next component, as though this Component were the focus owner.
See Also:   Component.requestFocus()
since:
   JDK1.1



transferFocusBackward
public void transferFocusBackward()(Code)
Transfers the focus to the previous component, as though this Component were the focus owner.
See Also:   Component.requestFocus()
since:
   1.4



transferFocusUpCycle
public void transferFocusUpCycle()(Code)
Transfers the focus up one focus traversal cycle. Typically, the focus owner is set to this Component's focus cycle root, and the current focus cycle root is set to the new focus owner's focus cycle root. If, however, this Component's focus cycle root is a Window, then the focus owner is set to the focus cycle root's default Component to focus, and the current focus cycle root is unchanged.
See Also:   Component.requestFocus()
See Also:   Container.isFocusCycleRoot
See Also:   Container.setFocusCycleRoot(boolean)
since:
   1.4



update
public void update(Graphics g)(Code)
Updates this component.

If this component is not a lightweight component, the AWT calls the update method in response to a call to repaint. You can assume that the background is not cleared.

The update method of Component calls this component's paint method to redraw this component. This method is commonly overridden by subclasses which need to do additional work in response to a call to repaint. Subclasses of Component that override this method should either call super.update(g), or call paint(g) directly from their update method.

The origin of the graphics context, its (00) coordinate point, is the top-left corner of this component. The clipping region of the graphics context is the bounding rectangle of this component.

Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
Parameters:
  g - the specified context to use for updating
See Also:   Component.paint
See Also:   Component.repaint()
since:
   JDK1.0




updateCursorImmediately
final void updateCursorImmediately()(Code)
Updates the cursor. May not be invoked from the native message pump.



validate
public void validate()(Code)
Ensures that this component has a valid layout. This method is primarily intended to operate on instances of Container.
See Also:   Component.invalidate
See Also:   Component.doLayout()
See Also:   LayoutManager
See Also:   Container.validate
since:
   JDK1.0



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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