static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
}
/**
* Tries to find GraphicsConfiguration that contains the mouse cursor position. Can return null.
*/
private GraphicsConfiguration getCurrentGraphicsConfiguration(Point popupLocation) {
GraphicsConfiguration gc = null;
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] gd = ge.getScreenDevices();
for (int i = 0; i < gd.length; i++) {
if (gd[i].getType() == GraphicsDevice.TYPE_RASTER_SCREEN) {
GraphicsConfiguration dgc = gd[i].getDefaultConfiguration();
if (dgc.getBounds().contains(popupLocation)) {
gc = dgc;
break;
}
}
}
// If not found and we have invoker, ask invoker about his gc
if (gc == null && getInvoker() != null) {
gc = getInvoker().getGraphicsConfiguration();
}
return gc;
}
/**
* Returns an point which has been adjusted to take into account of the desktop bounds, taskbar
* and multi-monitor configuration.
*
* <p>This adustment may be cancelled by invoking the application with
* -Djavax.swing.adjustPopupLocationToFit=false
*/
Point adjustPopupLocationToFitScreen(int xPosition, int yPosition) {
Point popupLocation = new Point(xPosition, yPosition);
if (popupPostionFixDisabled == true || GraphicsEnvironment.isHeadless()) {
return popupLocation;
}
// Get screen bounds
Rectangle scrBounds;
GraphicsConfiguration gc = getCurrentGraphicsConfiguration(popupLocation);
Toolkit toolkit = Toolkit.getDefaultToolkit();
if (gc != null) {
// If we have GraphicsConfiguration use it to get screen bounds
scrBounds = gc.getBounds();
} else {
// If we don't have GraphicsConfiguration use primary screen
scrBounds = new Rectangle(toolkit.getScreenSize());
}
// Calculate the screen size that popup should fit
Dimension popupSize = JPopupMenu.this.getPreferredSize();
long popupRightX = (long) popupLocation.x + (long) popupSize.width;
long popupBottomY = (long) popupLocation.y + (long) popupSize.height;
int scrWidth = scrBounds.width;
int scrHeight = scrBounds.height;
if (!canPopupOverlapTaskBar()) {
// Insets include the task bar. Take them into account.
Insets scrInsets = toolkit.getScreenInsets(gc);
scrBounds.x += scrInsets.left;
scrBounds.y += scrInsets.top;
scrWidth -= scrInsets.left + scrInsets.right;
scrHeight -= scrInsets.top + scrInsets.bottom;
}
int scrRightX = scrBounds.x + scrWidth;
int scrBottomY = scrBounds.y + scrHeight;
// Ensure that popup menu fits the screen
if (popupRightX > (long) scrRightX) {
popupLocation.x = scrRightX - popupSize.width;
if (popupLocation.x < scrBounds.x) {
popupLocation.x = scrBounds.x;
}
}
if (popupBottomY > (long) scrBottomY) {
popupLocation.y = scrBottomY - popupSize.height;
if (popupLocation.y < scrBounds.y) {
popupLocation.y = scrBounds.y;
}
}
return popupLocation;
}
/**
* Reads the <code>ObjectInputStream</code> and if it isn't <code>null</code> adds a listener to
* receive action events fired by the button. Unrecognized keys or values will be ignored.
*
* @param s the <code>ObjectInputStream</code> to read
* @exception HeadlessException if <code>GraphicsEnvironment.isHeadless</code> returns <code>true
* </code>
* @serial
* @see #removeActionListener(ActionListener)
* @see #addActionListener(ActionListener)
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #writeObject(ObjectOutputStream)
*/
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException, HeadlessException {
GraphicsEnvironment.checkHeadless();
s.defaultReadObject();
Object keyOrNull;
while (null != (keyOrNull = s.readObject())) {
String key = ((String) keyOrNull).intern();
if (actionListenerK == key) addActionListener((ActionListener) (s.readObject()));
else // skip value for unrecognized key
s.readObject();
}
}
/**
* Constructs a button with the specified label.
*
* @param label a string label for the button, or <code>null</code> for no label
* @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public Button(String label) throws HeadlessException {
GraphicsEnvironment.checkHeadless();
this.label = label;
}