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| java.lang.Object
 java.awt.Component
java.awt.Canvas
| Canvas | | public class Canvas extends Component implements Accessible(Code) | | A Canvas component represents a blank rectangular
area of the screen onto which the application can draw or from
which the application can trap input events from the user.
An application must subclass the Canvas class in
order to get useful functionality such as creating a custom
component. The paint method must be overridden
in order to perform custom graphics on the canvas.
version:
1.48 06/05/07
author:
Sami Shaio
since:
JDK1.0 |
| Inner Class :protected class AccessibleAWTCanvas extends AccessibleAWTComponent | |
| Constructor Summary | |
| public | Canvas()
Constructs a new Canvas. | | public | Canvas(GraphicsConfiguration config)
Constructs a new Canvas given a GraphicsConfiguration object. |
| Canvas | | public Canvas()(Code) | | Constructs a new Canvas.
|
| constructComponentName | | String constructComponentName()(Code) | | Construct a name for this component. Called by getName() when the
name is null.
|
| createBufferStrategy | | public 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: Canvas.isDisplayable
See Also: Canvas.getBufferStrategy
since:
1.4 |
| createBufferStrategy | | public 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, the existing buffer strategy for this component is discarded.
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: Canvas.getBufferStrategy
since:
1.4 |
| getAccessibleContext | | public AccessibleContext getAccessibleContext()(Code) | | Gets the AccessibleContext associated with this Canvas.
For canvases, the AccessibleContext takes the form of an
AccessibleAWTCanvas.
A new AccessibleAWTCanvas instance is created if necessary.
an AccessibleAWTCanvas that serves as the AccessibleContext of this Canvas
since:
1.3 |
| getBufferStrategy | | public BufferStrategy getBufferStrategy()(Code) | | Returns the BufferStrategy used by this component. This
method will return null if a BufferStrategy has not yet
been created or has been disposed.
the buffer strategy used by this component
See Also: Canvas.createBufferStrategy
since:
1.4 |
| paint | | public void paint(Graphics g)(Code) | | Paints this canvas.
Most applications that subclass Canvas should
override this method in order to perform some useful operation
(typically, custom painting of the canvas).
The default operation is simply to clear the canvas.
Applications that override this method need not call
super.paint(g).
Parameters:
g - the specified Graphics context
See Also: Canvas.update(Graphics)
See Also: Component.paint(Graphics) |
| postsOldMouseEvents | | boolean postsOldMouseEvents()(Code) | | |
| update | | public void update(Graphics g)(Code) | | Updates this canvas.
This method is called in response to a call to repaint.
The canvas is first cleared by filling it with the background
color, and then completely redrawn by calling this canvas's
paint method.
Note: applications that override this method should either call
super.update(g) or incorporate the functionality described
above into their own code.
Parameters:
g - the specified Graphics context
See Also: Canvas.paint(Graphics)
See Also: Component.update(Graphics) |
| Methods inherited from java.awt.Component | public boolean action(Event evt, Object what)(Code)(Java Doc)
public void add(PopupMenu popup)(Code)(Java Doc)
public synchronized void addComponentListener(ComponentListener l)(Code)(Java Doc)
public synchronized void addFocusListener(FocusListener l)(Code)(Java Doc)
public void addHierarchyBoundsListener(HierarchyBoundsListener l)(Code)(Java Doc)
public void addHierarchyListener(HierarchyListener l)(Code)(Java Doc)
public synchronized void addInputMethodListener(InputMethodListener l)(Code)(Java Doc)
public synchronized void addKeyListener(KeyListener l)(Code)(Java Doc)
public synchronized void addMouseListener(MouseListener l)(Code)(Java Doc)
public synchronized void addMouseMotionListener(MouseMotionListener l)(Code)(Java Doc)
public synchronized void addMouseWheelListener(MouseWheelListener l)(Code)(Java Doc)
public void addNotify()(Code)(Java Doc)
public synchronized void addPropertyChangeListener(PropertyChangeListener listener)(Code)(Java Doc)
public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)(Java Doc)
void adjustListeningChildrenOnParent(long mask, int num)(Code)(Java Doc)
public void applyComponentOrientation(ComponentOrientation orientation)(Code)(Java Doc)
public boolean areFocusTraversalKeysSet(int id)(Code)(Java Doc)
boolean areInputMethodsEnabled()(Code)(Java Doc)
void autoProcessMouseWheel(MouseWheelEvent e)(Code)(Java Doc)
public Rectangle bounds()(Code)(Java Doc)
final boolean canBeFocusOwner()(Code)(Java Doc)
void checkGD(String stringID)(Code)(Java Doc)
public int checkImage(Image image, ImageObserver observer)(Code)(Java Doc)
public int checkImage(Image image, int width, int height, ImageObserver observer)(Code)(Java Doc)
boolean checkWindowClosingException()(Code)(Java Doc)
void clearCurrentFocusCycleRootOnHide()(Code)(Java Doc)
void clearMostRecentFocusOwnerOnHide()(Code)(Java Doc)
protected AWTEvent coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent)(Code)(Java Doc)
String constructComponentName()(Code)(Java Doc)
public boolean contains(int x, int y)(Code)(Java Doc)
public boolean contains(Point p)(Code)(Java Doc)
boolean containsFocus()(Code)(Java Doc)
int countHierarchyMembers()(Code)(Java Doc)
void createBufferStrategy(int numBuffers)(Code)(Java Doc)
void createBufferStrategy(int numBuffers, BufferCapabilities caps) throws AWTException(Code)(Java Doc)
int createHierarchyEvents(int id, Component changed, Container changedParent, long changeFlags, boolean enabledOnToolkit)(Code)(Java Doc)
public Image createImage(ImageProducer producer)(Code)(Java Doc)
public Image createImage(int width, int height)(Code)(Java Doc)
public VolatileImage createVolatileImage(int width, int height)(Code)(Java Doc)
public VolatileImage createVolatileImage(int width, int height, ImageCapabilities caps) throws AWTException(Code)(Java Doc)
public void deliverEvent(Event e)(Code)(Java Doc)
public void disable()(Code)(Java Doc)
final protected void disableEvents(long eventsToDisable)(Code)(Java Doc)
final public void dispatchEvent(AWTEvent e)(Code)(Java Doc)
void dispatchEventImpl(AWTEvent e)(Code)(Java Doc)
boolean dispatchMouseWheelToAncestor(MouseWheelEvent e)(Code)(Java Doc)
public void doLayout()(Code)(Java Doc)
public void enable()(Code)(Java Doc)
public void enable(boolean b)(Code)(Java Doc)
final protected void enableEvents(long eventsToEnable)(Code)(Java Doc)
public void enableInputMethods(boolean enable)(Code)(Java Doc)
boolean eventEnabled(AWTEvent e)(Code)(Java Doc)
boolean eventTypeEnabled(int type)(Code)(Java Doc)
Component findUnderMouseInWindow(PointerInfo pi)(Code)(Java Doc)
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue)(Code)(Java Doc)
protected void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)(Code)(Java Doc)
protected void firePropertyChange(String propertyName, int oldValue, int newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, byte oldValue, byte newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, char oldValue, char newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, short oldValue, short newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, long oldValue, long newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, float oldValue, float newValue)(Code)(Java Doc)
public void firePropertyChange(String propertyName, double oldValue, double newValue)(Code)(Java Doc)
public AccessibleContext getAccessibleContext()(Code)(Java Doc)
int getAccessibleIndexInParent()(Code)(Java Doc)
AccessibleStateSet getAccessibleStateSet()(Code)(Java Doc)
public float getAlignmentX()(Code)(Java Doc)
public float getAlignmentY()(Code)(Java Doc)
Image getBackBuffer()(Code)(Java Doc)
public Color getBackground()(Code)(Java Doc)
public int getBaseline(int width, int height)(Code)(Java Doc)
public BaselineResizeBehavior getBaselineResizeBehavior()(Code)(Java Doc)
public Rectangle getBounds()(Code)(Java Doc)
public Rectangle getBounds(Rectangle rv)(Code)(Java Doc)
int getBoundsOp()(Code)(Java Doc)
BufferStrategy getBufferStrategy()(Code)(Java Doc)
public ColorModel getColorModel()(Code)(Java Doc)
public Component getComponentAt(int x, int y)(Code)(Java Doc)
public Component getComponentAt(Point p)(Code)(Java Doc)
public synchronized ComponentListener[] getComponentListeners()(Code)(Java Doc)
public ComponentOrientation getComponentOrientation()(Code)(Java Doc)
Window getContainingWindow()(Code)(Java Doc)
static Window getContainingWindow(Component comp)(Code)(Java Doc)
public Cursor getCursor()(Code)(Java Doc)
final Cursor getCursor_NoClientCode()(Code)(Java Doc)
public synchronized DropTarget getDropTarget()(Code)(Java Doc)
public Container getFocusCycleRootAncestor()(Code)(Java Doc)
public synchronized FocusListener[] getFocusListeners()(Code)(Java Doc)
public Set<AWTKeyStroke> getFocusTraversalKeys(int id)(Code)(Java Doc)
public boolean getFocusTraversalKeysEnabled()(Code)(Java Doc)
final Set getFocusTraversalKeys_NoIDCheck(int id)(Code)(Java Doc)
public Font getFont()(Code)(Java Doc)
public FontMetrics getFontMetrics(Font font)(Code)(Java Doc)
final Font getFont_NoClientCode()(Code)(Java Doc)
public Color getForeground()(Code)(Java Doc)
public Graphics getGraphics()(Code)(Java Doc)
public GraphicsConfiguration getGraphicsConfiguration()(Code)(Java Doc)
final GraphicsConfiguration getGraphicsConfiguration_NoClientCode()(Code)(Java Doc)
final Graphics getGraphics_NoClientCode()(Code)(Java Doc)
public int getHeight()(Code)(Java Doc)
public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners()(Code)(Java Doc)
public synchronized HierarchyListener[] getHierarchyListeners()(Code)(Java Doc)
public boolean getIgnoreRepaint()(Code)(Java Doc)
public InputContext getInputContext()(Code)(Java Doc)
public synchronized InputMethodListener[] getInputMethodListeners()(Code)(Java Doc)
public InputMethodRequests getInputMethodRequests()(Code)(Java Doc)
public synchronized KeyListener[] getKeyListeners()(Code)(Java Doc)
public T[] getListeners(Class<T> listenerType)(Code)(Java Doc)
public Locale getLocale()(Code)(Java Doc)
public Point getLocation()(Code)(Java Doc)
public Point getLocation(Point rv)(Code)(Java Doc)
public Point getLocationOnScreen()(Code)(Java Doc)
final Point getLocationOnScreen_NoTreeLock()(Code)(Java Doc)
public Dimension getMaximumSize()(Code)(Java Doc)
public Dimension getMinimumSize()(Code)(Java Doc)
public synchronized MouseListener[] getMouseListeners()(Code)(Java Doc)
public synchronized MouseMotionListener[] getMouseMotionListeners()(Code)(Java Doc)
public Point getMousePosition() throws HeadlessException(Code)(Java Doc)
public synchronized MouseWheelListener[] getMouseWheelListeners()(Code)(Java Doc)
public String getName()(Code)(Java Doc)
Container getNativeContainer()(Code)(Java Doc)
public Container getParent()(Code)(Java Doc)
final Container getParent_NoClientCode()(Code)(Java Doc)
public ComponentPeer getPeer()(Code)(Java Doc)
public Dimension getPreferredSize()(Code)(Java Doc)
public synchronized PropertyChangeListener[] getPropertyChangeListeners()(Code)(Java Doc)
public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)(Code)(Java Doc)
public Dimension getSize()(Code)(Java Doc)
public Dimension getSize(Dimension rv)(Code)(Java Doc)
public Toolkit getToolkit()(Code)(Java Doc)
final Toolkit getToolkitImpl()(Code)(Java Doc)
Container getTraversalRoot()(Code)(Java Doc)
final public Object getTreeLock()(Code)(Java Doc)
public int getWidth()(Code)(Java Doc)
public int getX()(Code)(Java Doc)
public int getY()(Code)(Java Doc)
public boolean gotFocus(Event evt, Object what)(Code)(Java Doc)
public boolean handleEvent(Event evt)(Code)(Java Doc)
public boolean hasFocus()(Code)(Java Doc)
public void hide()(Code)(Java Doc)
public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h)(Code)(Java Doc)
void initializeFocusTraversalKeys()(Code)(Java Doc)
public boolean inside(int x, int y)(Code)(Java Doc)
public void invalidate()(Code)(Java Doc)
public boolean isBackgroundSet()(Code)(Java Doc)
final boolean isCoalescingEnabled()(Code)(Java Doc)
public boolean isCursorSet()(Code)(Java Doc)
public boolean isDisplayable()(Code)(Java Doc)
public boolean isDoubleBuffered()(Code)(Java Doc)
public boolean isEnabled()(Code)(Java Doc)
final boolean isEnabledImpl()(Code)(Java Doc)
public boolean isFocusCycleRoot(Container container)(Code)(Java Doc)
public boolean isFocusOwner()(Code)(Java Doc)
public boolean isFocusTraversable()(Code)(Java Doc)
final boolean isFocusTraversableOverridden()(Code)(Java Doc)
public boolean isFocusable()(Code)(Java Doc)
public boolean isFontSet()(Code)(Java Doc)
public boolean isForegroundSet()(Code)(Java Doc)
static boolean isInstanceOf(Object obj, String className)(Code)(Java Doc)
public boolean isLightweight()(Code)(Java Doc)
public boolean isMaximumSizeSet()(Code)(Java Doc)
public boolean isMinimumSizeSet()(Code)(Java Doc)
public boolean isOpaque()(Code)(Java Doc)
public boolean isPreferredSizeSet()(Code)(Java Doc)
boolean isRecursivelyVisible()(Code)(Java Doc)
boolean isSameOrAncestorOf(Component comp, boolean allowChildren)(Code)(Java Doc)
public boolean isShowing()(Code)(Java Doc)
public boolean isValid()(Code)(Java Doc)
public boolean isVisible()(Code)(Java Doc)
final boolean isVisible_NoClientCode()(Code)(Java Doc)
public boolean keyDown(Event evt, int key)(Code)(Java Doc)
public boolean keyUp(Event evt, int key)(Code)(Java Doc)
public void layout()(Code)(Java Doc)
void lightweightPaint(Graphics g)(Code)(Java Doc)
void lightweightPrint(Graphics g)(Code)(Java Doc)
public void list()(Code)(Java Doc)
public void list(PrintStream out)(Code)(Java Doc)
public void list(PrintStream out, int indent)(Code)(Java Doc)
public void list(PrintWriter out)(Code)(Java Doc)
public void list(PrintWriter out, int indent)(Code)(Java Doc)
public Component locate(int x, int y)(Code)(Java Doc)
public Point location()(Code)(Java Doc)
public boolean lostFocus(Event evt, Object what)(Code)(Java Doc)
public Dimension minimumSize()(Code)(Java Doc)
public boolean mouseDown(Event evt, int x, int y)(Code)(Java Doc)
public boolean mouseDrag(Event evt, int x, int y)(Code)(Java Doc)
public boolean mouseEnter(Event evt, int x, int y)(Code)(Java Doc)
public boolean mouseExit(Event evt, int x, int y)(Code)(Java Doc)
public boolean mouseMove(Event evt, int x, int y)(Code)(Java Doc)
public boolean mouseUp(Event evt, int x, int y)(Code)(Java Doc)
public void move(int x, int y)(Code)(Java Doc)
public void nextFocus()(Code)(Java Doc)
int numListening(long mask)(Code)(Java Doc)
public void paint(Graphics g)(Code)(Java Doc)
public void paintAll(Graphics g)(Code)(Java Doc)
void paintHeavyweightComponents(Graphics g)(Code)(Java Doc)
protected String paramString()(Code)(Java Doc)
Point pointRelativeToComponent(Point absolute)(Code)(Java Doc)
public boolean postEvent(Event e)(Code)(Java Doc)
static boolean postNextFocusHelper(Component toFocus, CausedFocusEvent.Cause cause)(Code)(Java Doc)
boolean postsOldMouseEvents()(Code)(Java Doc)
final Component preNextFocusHelper()(Code)(Java Doc)
public Dimension preferredSize()(Code)(Java Doc)
public boolean prepareImage(Image image, ImageObserver observer)(Code)(Java Doc)
public boolean prepareImage(Image image, int width, int height, ImageObserver observer)(Code)(Java Doc)
public void print(Graphics g)(Code)(Java Doc)
public void printAll(Graphics g)(Code)(Java Doc)
void printHeavyweightComponents(Graphics g)(Code)(Java Doc)
protected void processComponentEvent(ComponentEvent e)(Code)(Java Doc)
protected void processEvent(AWTEvent e)(Code)(Java Doc)
protected void processFocusEvent(FocusEvent e)(Code)(Java Doc)
protected void processHierarchyBoundsEvent(HierarchyEvent e)(Code)(Java Doc)
protected void processHierarchyEvent(HierarchyEvent e)(Code)(Java Doc)
protected void processInputMethodEvent(InputMethodEvent e)(Code)(Java Doc)
protected void processKeyEvent(KeyEvent e)(Code)(Java Doc)
protected void processMouseEvent(MouseEvent e)(Code)(Java Doc)
protected void processMouseMotionEvent(MouseEvent e)(Code)(Java Doc)
protected void processMouseWheelEvent(MouseWheelEvent e)(Code)(Java Doc)
public void remove(MenuComponent popup)(Code)(Java Doc)
public synchronized void removeComponentListener(ComponentListener l)(Code)(Java Doc)
public synchronized void removeFocusListener(FocusListener l)(Code)(Java Doc)
public void removeHierarchyBoundsListener(HierarchyBoundsListener l)(Code)(Java Doc)
public void removeHierarchyListener(HierarchyListener l)(Code)(Java Doc)
public synchronized void removeInputMethodListener(InputMethodListener l)(Code)(Java Doc)
public synchronized void removeKeyListener(KeyListener l)(Code)(Java Doc)
public synchronized void removeMouseListener(MouseListener l)(Code)(Java Doc)
public synchronized void removeMouseMotionListener(MouseMotionListener l)(Code)(Java Doc)
public synchronized void removeMouseWheelListener(MouseWheelListener l)(Code)(Java Doc)
public void removeNotify()(Code)(Java Doc)
public synchronized void removePropertyChangeListener(PropertyChangeListener listener)(Code)(Java Doc)
public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)(Java Doc)
public void repaint()(Code)(Java Doc)
public void repaint(long tm)(Code)(Java Doc)
public void repaint(int x, int y, int width, int height)(Code)(Java Doc)
public void repaint(long tm, int x, int y, int width, int height)(Code)(Java Doc)
public void requestFocus()(Code)(Java Doc)
void requestFocus(CausedFocusEvent.Cause cause)(Code)(Java Doc)
protected boolean requestFocus(boolean temporary)(Code)(Java Doc)
boolean requestFocus(boolean temporary, CausedFocusEvent.Cause cause)(Code)(Java Doc)
final boolean requestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed)(Code)(Java Doc)
final boolean requestFocusHelper(boolean temporary, boolean focusedWindowChangeAllowed, CausedFocusEvent.Cause cause)(Code)(Java Doc)
public boolean requestFocusInWindow()(Code)(Java Doc)
boolean requestFocusInWindow(CausedFocusEvent.Cause cause)(Code)(Java Doc)
protected boolean requestFocusInWindow(boolean temporary)(Code)(Java Doc)
boolean requestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause)(Code)(Java Doc)
void resetGC()(Code)(Java Doc)
public void reshape(int x, int y, int width, int height)(Code)(Java Doc)
public void resize(int width, int height)(Code)(Java Doc)
public void resize(Dimension d)(Code)(Java Doc)
public void setBackground(Color c)(Code)(Java Doc)
public void setBounds(int x, int y, int width, int height)(Code)(Java Doc)
public void setBounds(Rectangle r)(Code)(Java Doc)
void setBoundsOp(int op)(Code)(Java Doc)
public void setComponentOrientation(ComponentOrientation o)(Code)(Java Doc)
public void setCursor(Cursor cursor)(Code)(Java Doc)
public synchronized void setDropTarget(DropTarget dt)(Code)(Java Doc)
public void setEnabled(boolean b)(Code)(Java Doc)
public void setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes)(Code)(Java Doc)
public void setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)(Code)(Java Doc)
final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes)(Code)(Java Doc)
public void setFocusable(boolean focusable)(Code)(Java Doc)
public void setFont(Font f)(Code)(Java Doc)
public void setForeground(Color c)(Code)(Java Doc)
void setGCFromPeer()(Code)(Java Doc)
public void setIgnoreRepaint(boolean ignoreRepaint)(Code)(Java Doc)
public void setLocale(Locale l)(Code)(Java Doc)
public void setLocation(int x, int y)(Code)(Java Doc)
public void setLocation(Point p)(Code)(Java Doc)
public void setMaximumSize(Dimension maximumSize)(Code)(Java Doc)
public void setMinimumSize(Dimension minimumSize)(Code)(Java Doc)
public void setName(String name)(Code)(Java Doc)
public void setPreferredSize(Dimension preferredSize)(Code)(Java Doc)
static synchronized void setRequestFocusController(RequestFocusController requestController)(Code)(Java Doc)
public void setSize(int width, int height)(Code)(Java Doc)
public void setSize(Dimension d)(Code)(Java Doc)
public void setVisible(boolean b)(Code)(Java Doc)
public void show()(Code)(Java Doc)
public void show(boolean b)(Code)(Java Doc)
public Dimension size()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public void transferFocus()(Code)(Java Doc)
public void transferFocusBackward()(Code)(Java Doc)
public void transferFocusUpCycle()(Code)(Java Doc)
public void update(Graphics g)(Code)(Java Doc)
final void updateCursorImmediately()(Code)(Java Doc)
public void validate()(Code)(Java Doc)
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