FileDocCategorySizeDatePackage
SwingPaintEventDispatcher.javaAPI DocJava SE 6 API3267Tue Jun 10 00:26:40 BST 2008javax.swing

SwingPaintEventDispatcher

public class SwingPaintEventDispatcher extends PaintEventDispatcher
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

Fields Summary
private static final boolean
SHOW_FROM_DOUBLE_BUFFER
private static final boolean
ERASE_BACKGROUND
Constructors Summary
Methods Summary
public java.awt.event.PaintEventcreatePaintEvent(java.awt.Component component, int x, int y, int w, int h)

        SHOW_FROM_DOUBLE_BUFFER = "true".equals(AccessController.doPrivileged(
              new GetPropertyAction("swing.showFromDoubleBuffer", "true")));
        ERASE_BACKGROUND = AccessController.doPrivileged(
                                 new GetBooleanAction("swing.nativeErase"));
    
        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 booleanqueueSurfaceDataReplacing(java.awt.Component c, java.lang.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);
public booleanshouldDoNativeBackgroundErase(java.awt.Component c)

        return ERASE_BACKGROUND || !(c instanceof RootPaneContainer);