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RepaintManager.java
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1998-02-26
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/*
* @(#)RepaintManager.java 1.19 98/01/30
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
/**
* @version 1.19 01/30/98
* @author Arnaud Weber
*/
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.applet.*;
public class RepaintManager {
Hashtable dirtyComponents;
boolean doubleBufferingEnabled = true;
Image doubleBuffer;
Dimension doubleBufferMaxSize;
Vector invalidComponents;
Timer flushTimer;
boolean actionPending;
RepaintListener repaintListener = new RepaintListener(this);
private static final Object repaintManagerKey = RepaintManager.class;
/** Return the RepaintManager for the calling thread.
* This method will maintain one RepaintManager per
* thread group.
*/
public static RepaintManager currentManager(JComponent comp) {
RepaintManager result = (RepaintManager)
SwingUtilities.appContextGet(repaintManagerKey);
if(result == null) {
result = new RepaintManager();
SwingUtilities.appContextPut(repaintManagerKey, result);
}
return result;
}
/** Set the RepaintManager that should be used for the calling
* thread. <b>aRepaintManager</b> will become the current RepaintManager
* for the calling thread's thread group.
*/
public static void setCurrentManager(RepaintManager aRepaintManager) {
if (aRepaintManager != null) {
SwingUtilities.appContextPut(repaintManagerKey, aRepaintManager);
} else {
SwingUtilities.appContextRemove(repaintManagerKey);
}
}
/** Create a new RepaintManager instance. You rarely call this constructor.
* directly. To get the default RepaintManager, use
* RepaintManager.currentManager(JComponent) (normally "this").
*/
public RepaintManager() {
dirtyComponents = new Hashtable();
doubleBufferMaxSize = Toolkit.getDefaultToolkit().getScreenSize();
}
void setupTimer() {
if(flushTimer == null) {
flushTimer = new Timer(0,repaintListener);
flushTimer.setRepeats(false);
flushTimer.setCoalesce(true);
}
if(flushTimer.isRunning())
flushTimer.stop();
flushTimer.start();
//System.out.println("**** timer started *****" + TimerQueue.sharedInstance());
}
/* Add a component in the list of component with an invalid layout
*/
public synchronized void addInvalidComponent(JComponent component) {
Component validateRoot = null;
for(Component c = component; c != null; c = c.getParent()) {
if (c instanceof CellRendererPane) {
return;
}
if ((c instanceof JComponent) && (((JComponent)c).isValidateRoot())) {
validateRoot = c;
}
}
if(validateRoot != null) {
Component ic;
int i,c;
if(invalidComponents == null) {
invalidComponents = new Vector();
}
for(i=0,c=invalidComponents.size();i<c;i++) {
ic = (Component) invalidComponents.elementAt(i);
if(ic == validateRoot)
return;
}
invalidComponents.addElement(validateRoot);
if(!actionPending) {
actionPending = true;
setupTimer();
}
}
}
/** Remove an invalid component **/
public synchronized void removeInvalidComponent(JComponent component) {
if(invalidComponents != null) {
int index = invalidComponents.indexOf(component);
if(index != -1) {
invalidComponents.removeElementAt(index);
}
}
}
/** Add a component in the list of component that should be refreshed.
* If aComponent already has some dirty region, the rectangle <b>(x,y,w,h)</b> will be
* added to the region that should be redrawn.
*/
public synchronized void addDirtyRegion(JComponent aComponent,int x,int y,int w,int h) {
Rectangle r = null;
if(w <= 0 || h <= 0)
return;
if(!aComponent.isShowing()) {
return;
}
if(dirtyComponents == null)
dirtyComponents = new Hashtable();
else
r = (Rectangle) dirtyComponents.get(aComponent);
if(r == null) {
r = new Rectangle(x,y,w,h);
dirtyComponents.put(aComponent,r);
} else
SwingUtilities.computeUnion(x,y,w,h,r);
if(!actionPending) {
actionPending = true;
setupTimer();
}
}
/** Return the current dirty region for a component.
* Return an empty rectangle if the component is not
* dirty.
*/
public Rectangle getDirtyRegion(JComponent aComponent) {
Rectangle r = null;
synchronized(this) {
if(dirtyComponents != null)
r = (Rectangle)dirtyComponents.get(aComponent);
}
if(r == null)
return new Rectangle(0,0,0,0);
else
return new Rectangle(r);
}
/** Mark a component completely dirty. <b>aComponent</b> will be
* completely painted during the next paintDirtyRegions() call.
*/
public void markCompletelyDirty(JComponent aComponent) {
addDirtyRegion(aComponent,0,0,Integer.MAX_VALUE,Integer.MAX_VALUE);
}
/** Mark a component completely clean. <b>aComponent</b> will not
* get painted during the next paintDirtyRegions() call
*/
public void markCompletelyClean(JComponent aComponent) {
synchronized(this) {
if(dirtyComponents != null)
dirtyComponents.remove(aComponent);
}
}
/** Convenience that returns true if <b>aComponent</b> will be completely
* painted during the next paintDirtyRegions(). If computing dirty regions is
* expensive for your component, use this method and avoid computing dirty region
* if it return true.
*/
public boolean isCompletelyDirty(JComponent aComponent) {
Rectangle r;
r = getDirtyRegion(aComponent);
if(r.width == Integer.MAX_VALUE &&
r.height == Integer.MAX_VALUE)
return true;
else
return false;
}
public void repaintDirtyRegions() {
// System.out.println("**** action performed ***** " + invalidComponents);
synchronized(this) {
actionPending = false;
if(flushTimer != null)
flushTimer.stop();
}
validateInvalidComponents();
paintDirtyRegions();
}
/** Cause all invalide component to get validated **/
public void validateInvalidComponents() {
Vector ic;
int i,c;
synchronized(this) {
if(invalidComponents == null)
return;
ic = invalidComponents;
invalidComponents = null;
}
for(i=0,c=ic.size() ; i < c ; i++) {
((Component)ic.elementAt(i)).validate();
}
}
/** Cause all the known dirty regions to be painted
*/
public void paintDirtyRegions() {
int i, count;
Hashtable tmpDirtyComponents;
Vector roots;
JComponent dirtyComponent;
/** Get all the dirty components at once.
*/
synchronized(this) {
if(dirtyComponents == null) {
return;
}
tmpDirtyComponents = dirtyComponents;
dirtyComponents = null;
}
count = tmpDirtyComponents.size();
if (count == 0) {
// System.out.println("No dirty component");
return;
}
Rectangle rect;
Rectangle localBounds;
Enumeration keys;
roots = new Vector(count);
keys = tmpDirtyComponents.keys();
while(keys.hasMoreElements()) {
dirtyComponent = (JComponent) keys.nextElement();
collectDirtyComponents(tmpDirtyComponents,dirtyComponent, roots);
}
count = roots.size();
// System.out.println("roots size is " + count);
for(i=0 ; i < count ; i++) {
dirtyComponent = (JComponent) roots.elementAt(i);
rect = (Rectangle) tmpDirtyComponents.get(dirtyComponent);
// System.out.println("Should refresh :" + rect);
localBounds = dirtyComponent.getBounds();
localBounds.x = localBounds.y = 0;
rect = rect.intersection(localBounds);
//System.out.println("** paint of " + dirtyComponent + rect);
dirtyComponent.paintImmediately(rect.x,rect.y,rect.width,rect.height);
}
}
void collectDirtyComponents(Hashtable dirtyComponents,
JComponent dirtyComponent,
Vector roots) {
int dx, dy, rootDx, rootDy;
Component component, rootDirtyComponent,parent;
Rectangle tmp;
Rectangle cBounds;
boolean opaqueAncestorFound = false;
// Find the highest parent which is dirty. When we get out of this
// rootDx and rootDy will contain the translation from the
// rootDirtyComponent's coordinate system to the coordinates of the
// original dirty component. The tmp Rect is also used to compute the
// visible portion of the dirtyRect.
component = rootDirtyComponent = dirtyComponent;
cBounds = dirtyComponent._bounds;
dx = rootDx = 0;
dy = rootDy = 0;
tmp = new Rectangle((Rectangle) dirtyComponents.get(dirtyComponent));
// System.out.println("Collect dirty component for bound " + tmp +
// "component bounds is " + cBounds);;
SwingUtilities.computeIntersection(0,0,cBounds.width,cBounds.height,tmp);
if (tmp.isEmpty()) {
// System.out.println("Empty 1");
return;
}
if(dirtyComponent.isOpaque())
opaqueAncestorFound = true;
for(;;) {
parent = component.getParent();
if(parent == null)
break;
if(!(parent instanceof JComponent))
break;
component = parent;
if(((JComponent)component).isOpaque())
opaqueAncestorFound = true;
dx += cBounds.x;
dy += cBounds.y;
tmp.setLocation(tmp.x + cBounds.x,
tmp.y + cBounds.y);
cBounds = ((JComponent)component)._bounds;
tmp = SwingUtilities.computeIntersection(0,0,cBounds.width,cBounds.height,tmp);
if (tmp.isEmpty()) {
// System.out.println("Empty 2");
return;
}
if (dirtyComponents.get(component) != null) {
rootDirtyComponent = component;
rootDx = dx;
rootDy = dy;
}
}
if (dirtyComponent != rootDirtyComponent) {
Rectangle r;
tmp.setLocation(tmp.x + rootDx - dx,
tmp.y + rootDy - dy);
r = (Rectangle)dirtyComponents.get(rootDirtyComponent);
SwingUtilities.computeUnion(tmp.x,tmp.y,tmp.width,tmp.height,r);
}
// If we haven't seen this root before, then we need to add it to the
// list of root dirty Views.
if (!roots.contains(rootDirtyComponent))
roots.addElement(rootDirtyComponent);
}
public synchronized String toString() {
StringBuffer sb = new StringBuffer();
if(dirtyComponents != null)
sb.append("" + dirtyComponents);
return sb.toString();
}
/** Return the offscreen buffer that should be used as a double buffer with the component <code>c</code>
* By default there is a double buffer per RepaintManager.
* The buffer might be smaller than <code>(proposedWidth,proposedHeight)</code>
* This happens when the maximum double buffer size as been set for the receiving
* repaint manager.
*/
public Image getOffscreenBuffer(Component c,int proposedWidth,int proposedHeight) {
Image result;
int width,height;
if(proposedWidth > doubleBufferMaxSize.width)
width = doubleBufferMaxSize.width;
else
width = proposedWidth;
if(proposedHeight > doubleBufferMaxSize.height)
height =doubleBufferMaxSize.height;
else
height = proposedHeight;
if(doubleBuffer != null) {
if(doubleBuffer.getWidth(null) < width ||
doubleBuffer.getHeight(null) < height)
doubleBuffer = null;
}
if(doubleBuffer == null) {
doubleBuffer = c.createImage(width,height);
// System.out.println("Creating offscreen buffer " + new Dimension(width,height));
}
return doubleBuffer;
}
/** Set the maximum double buffer size. **/
public void setDoubleBufferMaximumSize(Dimension d) {
doubleBufferMaxSize = d;
if(doubleBuffer != null) {
if(doubleBuffer.getWidth(null) > d.width ||
doubleBuffer.getHeight(null) > d.height)
doubleBuffer = null;
}
}
public Dimension getDoubleBufferMaximumSize() {
return doubleBufferMaxSize;
}
public void setDoubleBufferingEnabled(boolean aFlag) {
doubleBufferingEnabled = aFlag;
if(!doubleBufferingEnabled) {
doubleBuffer = null;
}
}
public boolean isDoubleBufferingEnabled() {
return doubleBufferingEnabled;
}
static class RepaintListener implements ActionListener {
RepaintManager manager;
public RepaintListener(RepaintManager rp) {
manager = rp;
}
public void actionPerformed(ActionEvent e) {
manager.repaintDirtyRegions();
}
}
}