Java Doc for Canvas.java in  » 6.0-JDK-Modules » j2me » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.awt.Component
      java.awt.Canvas

Canvas
public class Canvas extends Component (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:
   1.31, 08/19/02
author:
   Nicholas Allen
since:
   JDK1.0




Constructor Summary
public  Canvas()
     Constructs a new Canvas.

Method Summary
 StringconstructComponentName()
     Construct a name for this component.
 booleanisLightweightWhenDisplayable()
    
public  voidpaint(Graphics g)
     This method is called to repaint this canvas.
 booleanpostsOldMouseEvents()
    
public  voidupdate(Graphics g)
    


Constructor Detail
Canvas
public Canvas()(Code)
Constructs a new Canvas.




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



isLightweightWhenDisplayable
boolean isLightweightWhenDisplayable()(Code)



paint
public void paint(Graphics g)(Code)
This method is called to repaint this canvas. Most applications that subclass Canvas should override this method in order to perform some useful operation.

The paint method provided by Canvas redraws this canvas's rectangle in the background color.

The graphics context's origin (0, 0) is the top-left corner of this canvas. Its clipping region is the area of the context.
Parameters:
  g - the graphics context.
See Also:   java.awt.Graphics
since:
   JDK1.0




postsOldMouseEvents
boolean postsOldMouseEvents()(Code)



update
public void update(Graphics g)(Code)



Fields inherited from java.awt.Component
final public static float BOTTOM_ALIGNMENT(Code)(Java Doc)
final public static float CENTER_ALIGNMENT(Code)(Java Doc)
final public static float LEFT_ALIGNMENT(Code)(Java Doc)
final static Object LOCK(Code)(Java Doc)
final public static float RIGHT_ALIGNMENT(Code)(Java Doc)
final public static float TOP_ALIGNMENT(Code)(Java Doc)
final static String actionListenerK(Code)(Java Doc)
final static String adjustmentListenerK(Code)(Java Doc)
Color background(Code)(Java Doc)
transient ComponentListener componentListener(Code)(Java Doc)
final static String componentListenerK(Code)(Java Doc)
final static String containerListenerK(Code)(Java Doc)
Cursor cursor(Code)(Java Doc)
final static boolean defaultNewEventsOnly(Code)(Java Doc)
transient Component delegate(Code)(Java Doc)
transient Component delegateSource(Code)(Java Doc)
boolean enabled(Code)(Java Doc)
long eventMask(Code)(Java Doc)
transient FocusListener focusListener(Code)(Java Doc)
final static String focusListenerK(Code)(Java Doc)
Font font(Code)(Java Doc)
Color foreground(Code)(Java Doc)
int height(Code)(Java Doc)
static int incRate(Code)(Java Doc)
static boolean isInc(Code)(Java Doc)
final static String itemListenerK(Code)(Java Doc)
transient KeyListener keyListener(Code)(Java Doc)
final static String keyListenerK(Code)(Java Doc)
Locale locale(Code)(Java Doc)
Dimension minSize(Code)(Java Doc)
transient MouseListener mouseListener(Code)(Java Doc)
final static String mouseListenerK(Code)(Java Doc)
transient MouseMotionListener mouseMotionListener(Code)(Java Doc)
final static String mouseMotionListenerK(Code)(Java Doc)
boolean newEventsOnly(Code)(Java Doc)
transient Container parent(Code)(Java Doc)
Vector popups(Code)(Java Doc)
Dimension prefSize(Code)(Java Doc)
final static String textListenerK(Code)(Java Doc)
static Timer updateTimer(Code)(Java Doc)
boolean valid(Code)(Java Doc)
boolean visible(Code)(Java Doc)
int width(Code)(Java Doc)
transient RuntimeException windowClosingException(Code)(Java Doc)
final static String windowListenerK(Code)(Java Doc)
int x(Code)(Java Doc)
transient ComponentXWindow xwindow(Code)(Java Doc)
int y(Code)(Java Doc)

Methods inherited from java.awt.Component
public boolean action(Event evt, Object what)(Code)(Java Doc)
public synchronized 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 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 void addNotify()(Code)(Java Doc)
boolean areInputMethodsEnabled()(Code)(Java Doc)
public Rectangle bounds()(Code)(Java Doc)
final void checkEnableNewEventsOnly(Object listener)(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)
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)
public Image createImage(ImageProducer producer)(Code)(Java Doc)
public Image createImage(int width, int height)(Code)(Java Doc)
ComponentXWindow createXWindow()(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)
public void doLayout()(Code)(Java Doc)
public void enable()(Code)(Java Doc)
public void enable(boolean b)(Code)(Java Doc)
final protected synchronized void enableEvents(long eventsToEnable)(Code)(Java Doc)
boolean eventEnabled(AWTEvent e)(Code)(Java Doc)
Component findFocusDelegate(Container container)(Code)(Java Doc)
public float getAlignmentX()(Code)(Java Doc)
public float getAlignmentY()(Code)(Java Doc)
public Color getBackground()(Code)(Java Doc)
public Rectangle getBounds()(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 Cursor getCursor()(Code)(Java Doc)
Component getFocusDelegate()(Code)(Java Doc)
public Font getFont()(Code)(Java Doc)
Component getFontAndColorDelegate()(Code)(Java Doc)
public FontMetrics getFontMetrics(Font font)(Code)(Java Doc)
public Color getForeground()(Code)(Java Doc)
public Graphics getGraphics()(Code)(Java Doc)
InputContext getInputContext()(Code)(Java Doc)
public Locale getLocale()(Code)(Java Doc)
public Point getLocation()(Code)(Java Doc)
public Point getLocationOnScreen()(Code)(Java Doc)
public Dimension getMaximumSize()(Code)(Java Doc)
public Dimension getMinimumSize()(Code)(Java Doc)
public String getName()(Code)(Java Doc)
Container getNativeContainer()(Code)(Java Doc)
public Container getParent()(Code)(Java Doc)
public Dimension getPreferredSize()(Code)(Java Doc)
public Dimension getSize()(Code)(Java Doc)
public Toolkit getToolkit()(Code)(Java Doc)
final public Object getTreeLock()(Code)(Java Doc)
public boolean gotFocus(Event evt, Object what)(Code)(Java Doc)
public boolean handleEvent(Event evt)(Code)(Java Doc)
public void hide()(Code)(Java Doc)
public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h)(Code)(Java Doc)
public boolean inside(int x, int y)(Code)(Java Doc)
public void invalidate()(Code)(Java Doc)
static void invokeAndWait(Runnable runnable)(Code)(Java Doc)
public boolean isDisplayable()(Code)(Java Doc)
public boolean isEnabled()(Code)(Java Doc)
public boolean isFocusTraversable()(Code)(Java Doc)
public boolean isLightweight()(Code)(Java Doc)
boolean isLightweightWhenDisplayable()(Code)(Java Doc)
public boolean isOpaque()(Code)(Java Doc)
public boolean isShowing()(Code)(Java Doc)
public boolean isValid()(Code)(Java Doc)
public boolean isVisible()(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 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)
public void paint(Graphics g)(Code)(Java Doc)
public void paintAll(Graphics g)(Code)(Java Doc)
protected String paramString()(Code)(Java Doc)
public boolean postEvent(Event e)(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)
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 processKeyEvent(KeyEvent e)(Code)(Java Doc)
protected void processMouseEvent(MouseEvent e)(Code)(Java Doc)
protected void processMouseMotionEvent(MouseEvent e)(Code)(Java Doc)
public synchronized 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 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 void removeNotify()(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)
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)
public synchronized void setCursor(Cursor cursor)(Code)(Java Doc)
public void setEnabled(boolean b)(Code)(Java Doc)
public void setFont(Font f)(Code)(Java Doc)
public void setForeground(Color c)(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 setName(String name)(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 update(Graphics g)(Code)(Java Doc)
public void validate()(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(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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