private static Frame getFrame(Component c) {
Component w = c;
while (!(w instanceof Frame) && (w != null)) {
w = w.getParent();
}
return (Frame) w;
}
/**
* Processes events on this button. If an event is an instance of <code>ActionEvent</code>, this
* method invokes the <code>processActionEvent</code> method. Otherwise, it invokes <code>
* processEvent</code> on the superclass.
*
* <p>Note that if the event parameter is <code>null</code> the behavior is unspecified and may
* result in an exception.
*
* @param e the event
* @see java.awt.event.ActionEvent
* @see java.awt.Button#processActionEvent
* @since JDK1.1
*/
protected void processEvent(AWTEvent e) {
if (e instanceof ActionEvent) {
processActionEvent((ActionEvent) e);
return;
}
super.processEvent(e);
}
/**
* Displays the popup menu at the position x,y in the coordinate space of the component invoker.
*
* @param invoker the component in whose space the popup menu is to appear
* @param x the x coordinate in invoker's coordinate space at which the popup menu is to be
* displayed
* @param y the y coordinate in invoker's coordinate space at which the popup menu is to be
* displayed
*/
public void show(Component invoker, int x, int y) {
if (DEBUG) {
System.out.println("in JPopupMenu.show ");
}
setInvoker(invoker);
Frame newFrame = getFrame(invoker);
if (newFrame != frame) {
// Use the invoker's frame so that events
// are propagated properly
if (newFrame != null) {
this.frame = newFrame;
if (popup != null) {
setVisible(false);
}
}
}
Point invokerOrigin;
if (invoker != null) {
invokerOrigin = invoker.getLocationOnScreen();
// To avoid integer overflow
long lx, ly;
lx = ((long) invokerOrigin.x) + ((long) x);
ly = ((long) invokerOrigin.y) + ((long) y);
if (lx > Integer.MAX_VALUE) lx = Integer.MAX_VALUE;
if (lx < Integer.MIN_VALUE) lx = Integer.MIN_VALUE;
if (ly > Integer.MAX_VALUE) ly = Integer.MAX_VALUE;
if (ly < Integer.MIN_VALUE) ly = Integer.MIN_VALUE;
setLocation((int) lx, (int) ly);
} else {
setLocation(x, y);
}
setVisible(true);
}
/**
* Overridden to enforce the position of the glass component as the zero child.
*
* @param comp the component to be enhanced
* @param constraints the constraints to be respected
* @param index the index
*/
protected void addImpl(Component comp, Object constraints, int index) {
super.addImpl(comp, constraints, index);
/// We are making sure the glassPane is on top.
if (glassPane != null && glassPane.getParent() == this && getComponent(0) != glassPane) {
add(glassPane, 0);
}
}
/**
* Sets a specified <code>Component</code> to be the glass pane for this root pane. The glass pane
* should normally be a lightweight, transparent component, because it will be made visible when
* ever the root pane needs to grab input events.
*
* <p>The new glass pane's visibility is changed to match that of the current glass pane. An
* implication of this is that care must be taken when you want to replace the glass pane and make
* it visible. Either of the following will work:
*
* <pre>
* root.setGlassPane(newGlassPane);
* newGlassPane.setVisible(true);
* </pre>
*
* or:
*
* <pre>
* root.getGlassPane().setVisible(true);
* root.setGlassPane(newGlassPane);
* </pre>
*
* @param glass the <code>Component</code> to use as the glass pane for this <code>JRootPane
* </code>
* @exception NullPointerException if the <code>glass</code> parameter is <code>null</code>
*/
public void setGlassPane(Component glass) {
if (glass == null) {
throw new NullPointerException("glassPane cannot be set to null.");
}
AWTAccessor.getComponentAccessor().setMixingCutoutShape(glass, new Rectangle());
boolean visible = false;
if (glassPane != null && glassPane.getParent() == this) {
this.remove(glassPane);
visible = glassPane.isVisible();
}
glass.setVisible(visible);
glassPane = glass;
this.add(glassPane, 0);
if (visible) {
repaint();
}
}
public synchronized void paintIcon(Component c, Graphics g, int x, int y) {
g.setColor(Color.white);
g.fillRect(0, 0, c.getWidth(), c.getHeight());
if (getImageObserver() == null) {
g.drawImage(
getImage(),
c.getWidth() / 2 - getIconWidth() / 2,
c.getHeight() / 2 - getIconHeight() / 2,
c);
} else {
g.drawImage(
getImage(),
c.getWidth() / 2 - getIconWidth() / 2,
c.getHeight() / 2 - getIconHeight() / 2,
getImageObserver());
}
}
/**
* The <code>glassPane</code> and <code>contentPane</code> have the same bounds, which means
* <code>JRootPane</code> does not tiles its children and this should return false. On the other
* hand, the <code>glassPane</code> is normally not visible, and so this can return true if the
* <code>glassPane</code> isn't visible. Therefore, the return value here depends upon the
* visibility of the <code>glassPane</code>.
*
* @return true if this component's children don't overlap
*/
public boolean isOptimizedDrawingEnabled() {
return !glassPane.isVisible();
}
/**
* Creates the peer of the button. The button's peer allows the application to change the look of
* the button without changing its functionality.
*
* @see java.awt.Toolkit#createButton(java.awt.Button)
* @see java.awt.Component#getToolkit()
*/
public void addNotify() {
synchronized (getTreeLock()) {
if (peer == null) peer = getToolkit().createButton(this);
super.addNotify();
}
}
