Examples of ae.java.awt.Component

ae.java.awt.Component
, 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 ae.java.awt.*; import ae.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. @author Arthur van Hoff @author Sami Shaio

     *
     * @param   target Component to <code>paint</code> or <code>update</code>
     * @since   1.4
     */
    public void paint(Object target, boolean shouldClearRectBeforePaint) {
        Component comp = (Component)target;


        if (isEmpty()) {
            return;
        }


        if (!comp.isVisible()) {
            return;
        }


        RepaintArea ra = this.cloneAndReset();


        if (!subtract(ra.paintRects[VERTICAL], ra.paintRects[HORIZONTAL])) {
            subtract(ra.paintRects[HORIZONTAL], ra.paintRects[VERTICAL]);
        }


        if (ra.paintRects[HORIZONTAL] != null && ra.paintRects[VERTICAL] != null) {
            Rectangle paintRect = ra.paintRects[HORIZONTAL].union(ra.paintRects[VERTICAL]);
            int square = paintRect.width * paintRect.height;
            int benefit = square - ra.paintRects[HORIZONTAL].width
                * ra.paintRects[HORIZONTAL].height - ra.paintRects[VERTICAL].width
                * ra.paintRects[VERTICAL].height;
            // if benefit is comparable with bounding box
            if (MAX_BENEFIT_RATIO * benefit < square) {
                ra.paintRects[HORIZONTAL] = paintRect;
                ra.paintRects[VERTICAL] = null;
            }
        }
        for (int i = 0; i < paintRects.length; i++) {
            if (ra.paintRects[i] != null
                && !ra.paintRects[i].isEmpty())
            {
                // Should use separate Graphics for each paint() call,
                // since paint() can change Graphics state for next call.
                Graphics g = comp.getGraphics();
                if (g != null) {
                    try {
                        g.setClip(ra.paintRects[i]);
                        if (i == UPDATE) {
                            updateComponent(comp, g);

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   boolean useBelowTheSpotInput() {
        return belowTheSpotInputRequested && inputMethodSupportsBelowTheSpot;
    }


    private boolean haveActiveClient() {
        Component client = getClientComponent();
        return client != null
               && client.getInputMethodRequests() != null;
    }

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        }


        // Ignore focus events that relate to the InputMethodWindow of this context.
        // This is a workaround.  Should be removed after 4452384 is fixed.
        if (event instanceof FocusEvent) {
            Component opposite = ((FocusEvent)event).getOppositeComponent();
            if ((opposite != null) &&
                (getComponentWindow(opposite) instanceof InputMethodWindow) &&
                (opposite.getInputContext() == this)) {
                return;
            }
        }


        InputMethod inputMethod = getInputMethod();

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            inputMethod.notifyClientWindowChange(clientWindowLocation);
        }
    }


    private synchronized void addClientWindowListeners() {
        Component client = getClientComponent();
        if (client == null) {
            return;
        }
        Window window = getComponentWindow(client);
        if (window == null) {

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                AttributedCharacterIterator text, int committedCharacterCount,
                TextHitInfo caret, TextHitInfo visiblePosition) {
        // We need to record the client component as the source so
        // that we have correct information if we later have to break up this
        // event into key events.
        Component source;


        source = getClientComponent();
        if (source != null) {
            InputMethodEvent event = new InputMethodEvent(source,
                    id, text, committedCharacterCount, caret, visiblePosition);


            if (haveActiveClient() && !useBelowTheSpotInput()) {
                source.dispatchEvent(event);
            } else {
                getCompositionAreaHandler(true).processInputMethodEvent(event);
            }
        }
    }

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    public synchronized void setComponent(Component c) {
        if (component == c || component != null && component.equals(c))
            return;


        Component     old;
        ComponentPeer oldPeer = null;


        if ((old = component) != null) {
            clearAutoscroll();


            component = null;


            if (componentPeer != null) {
                oldPeer = componentPeer;
                removeNotify(componentPeer);
            }


            old.setDropTarget(null);


        }


        if ((component = c) != null) try {
            c.setDropTarget(this);
        } catch (Exception e) { // undo the change
            if (old != null) {
                old.setDropTarget(this);
                addNotify(oldPeer);
            }
        }
    }

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    /**
     * actual processing on EventQueue Thread
     */


    protected void processEnterMessage(SunDropTargetEvent event) {
        Component  c    = (Component)event.getSource();
        DropTarget dt   = c.getDropTarget();
        Point      hots = event.getPoint();


        local = getJVMLocalSourceTransferable();


        if (currentDTC != null) { // some wreckage from last time
            currentDTC.removeNotify();
            currentDTC = null;
        }


        if (c.isShowing() && dt != null && dt.isActive()) {
            currentDT  = dt;
            currentDTC = currentDT.getDropTargetContext();


            currentDTC.addNotify(this);

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    /**
     *
     */


    protected void processExitMessage(SunDropTargetEvent event) {
        Component         c   = (Component)event.getSource();
        DropTarget        dt  = c.getDropTarget();
        DropTargetContext dtc = null;


        if (dt == null) {
            currentDT = null;
            currentT  = null;

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     *
     */


    protected void processMotionMessage(SunDropTargetEvent event,
                                      boolean operationChanged) {
        Component         c    = (Component)event.getSource();
        Point             hots = event.getPoint();
        int               id   = event.getID();
        DropTarget        dt   = c.getDropTarget();
        DropTargetContext dtc  = null;


        if (c.isShowing() && (dt != null) && dt.isActive()) {
            if (currentDT != dt) {
                if (currentDTC != null) {
                    currentDTC.removeNotify();
                }

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    /**
     *
     */


    protected void processDropMessage(SunDropTargetEvent event) {
        Component  c    = (Component)event.getSource();
        Point      hots = event.getPoint();
        DropTarget dt   = c.getDropTarget();


        dropStatus   = STATUS_WAIT; // drop pending ACK
        dropComplete = false;


        if (c.isShowing() && dt != null && dt.isActive()) {
            DropTargetContext dtc = dt.getDropTargetContext();


            currentDT = dt;


            if (currentDTC != null) {

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Related Classes of ae.java.awt.Component

ae.java.awt.dnd.DropTarget

ae.java.awt.peer.ComponentPeer

ae.java.awt.peer.ContainerPeer

ae.sun.awt.AppContext

ae.sun.awt.dnd.SunDropTargetContextPeer

ae.sun.awt.im.InputContext

ae.sun.awt.im.InputMethodContext

ae.sun.awt.RepaintArea

ae.sun.java2d.pipe.hw.ExtendedBufferCapabilities

ae.sun.java2d.pipe.Region

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