/*
* @(#)SwingPaintEventDispatcher.java 1.3 05/11/30
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.swing;
import java.awt.Component;
import java.awt.Container;
import java.awt.Rectangle;
import java.awt.event.PaintEvent;
import java.security.AccessController;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import sun.awt.event.IgnorePaintEvent;
import sun.security.action.GetBooleanAction;
import sun.security.action.GetPropertyAction;
/**
* Swing's PaintEventDispatcher. If the component specified by the PaintEvent
* is a top level Swing component (JFrame, JWindow, JDialog, JApplet), this
* will forward the request to the RepaintManager for eventual painting.
*
* @version 1.3, 11/30/05
*/
class SwingPaintEventDispatcher extends sun.awt.PaintEventDispatcher {
private static final boolean SHOW_FROM_DOUBLE_BUFFER;
private static final boolean ERASE_BACKGROUND;
static {
SHOW_FROM_DOUBLE_BUFFER = "true".equals(AccessController.doPrivileged(
new GetPropertyAction("swing.showFromDoubleBuffer", "true")));
ERASE_BACKGROUND = AccessController.doPrivileged(
new GetBooleanAction("swing.nativeErase"));
}
public PaintEvent createPaintEvent(Component component, int x, int y,
int w, int h) {
if (component instanceof RootPaneContainer) {
AppContext appContext = SunToolkit.targetToAppContext(component);
RepaintManager rm = RepaintManager.currentManager(appContext);
if (!SHOW_FROM_DOUBLE_BUFFER ||
!rm.show((Container)component, x, y, w, h)) {
rm.nativeAddDirtyRegion(appContext, (Container)component,
x, y, w, h);
}
// For backward compatibility generate an empty paint
// event. Not doing this broke parts of Netbeans.
return new IgnorePaintEvent(component, PaintEvent.PAINT,
new Rectangle(x, y, w, h));
}
else if (component instanceof SwingHeavyWeight) {
AppContext appContext = SunToolkit.targetToAppContext(component);
RepaintManager rm = RepaintManager.currentManager(appContext);
rm.nativeAddDirtyRegion(appContext, (Container)component,
x, y, w, h);
return new IgnorePaintEvent(component, PaintEvent.PAINT,
new Rectangle(x, y, w, h));
}
return super.createPaintEvent(component, x, y, w, h);
}
public boolean shouldDoNativeBackgroundErase(Component c) {
return ERASE_BACKGROUND || !(c instanceof RootPaneContainer);
}
public boolean queueSurfaceDataReplacing(Component c, Runnable r) {
if (c instanceof RootPaneContainer) {
AppContext appContext = SunToolkit.targetToAppContext(c);
RepaintManager.currentManager(appContext).
nativeQueueSurfaceDataRunnable(appContext, c, r);
return true;
}
return super.queueSurfaceDataReplacing(c, r);
}
}