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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Created by IntelliJ IDEA.
* User: max
* Date: Oct 30, 2006
* Time: 8:41:56 PM
*/
package com.intellij.ide;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.reference.SoftReference;
import com.intellij.util.ReflectionUtil;
import javax.swing.*;
import java.awt.*;
import java.awt.image.VolatileImage;
import java.lang.ref.WeakReference;
import java.util.Map;
/**
* see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6209673
*/
public class IdeRepaintManager extends RepaintManager {
private static final Logger LOG = Logger.getInstance("#com.intellij.ide.HackyRepaintManager");
private Map<GraphicsConfiguration, VolatileImage> myImagesMap;
WeakReference<JComponent> myLastComponent;
public Image getVolatileOffscreenBuffer(Component c, int proposedWidth, int proposedHeight) {
final Image buffer = super.getVolatileOffscreenBuffer(c, proposedWidth, proposedHeight);
clearLeakyImages(false); // DisplayChangedListener might be unavailable
return buffer;
}
// sync here is to avoid data race when two(!) AWT threads on startup try to compete for the single myImagesMap
private synchronized void clearLeakyImages(boolean force) {
if (myImagesMap == null) {
myImagesMap = ReflectionUtil.getField(RepaintManager.class, this, Map.class, "volatileMap");
}
if (force ||
myImagesMap.size() > 3 /*leave no more than 3 images (usually one per screen) if DisplayChangedListener is not available */
) {
//Force the RepaintManager to clear out all of the VolatileImage back-buffers that it has cached.
// See Sun bug 6209673.
Dimension size = getDoubleBufferMaximumSize();
setDoubleBufferMaximumSize(new Dimension(0, 0));
setDoubleBufferMaximumSize(size);
}
}
private class DisplayChangeHandler implements sun.awt.DisplayChangedListener, Runnable {
public void displayChanged() {
EventQueue.invokeLater( this );
}
public void paletteChanged() {
EventQueue.invokeLater( this );
}
public void run() {
clearLeakyImages(true);
}
}
// We must keep a strong reference to the DisplayChangedListener,
// since SunDisplayChanger keeps only a WeakReference to it.
private DisplayChangeHandler displayChangeHack;
{
try {
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
env.getScreenDevices(); // init
Class<?> aClass = Class.forName("sun.awt.DisplayChangedListener"); // might be absent
displayChangeHack = new DisplayChangeHandler();
if (aClass.isInstance(env)) { // Headless env does not implement sun.awt.DisplayChangedListener (and lacks addDisplayChangedListener)
env.getClass()
.getMethod("addDisplayChangedListener", new Class[]{aClass})
.invoke(env, displayChangeHack);
}
}
catch (Throwable t) {
if (!(t instanceof HeadlessException)) LOG.error("Cannot setup display change listener", t);
}
}
@Override
public void validateInvalidComponents() {
super.validateInvalidComponents();
}
@Override
public void addInvalidComponent(final JComponent invalidComponent) {
checkThreadViolations(invalidComponent);
super.addInvalidComponent(invalidComponent);
}
@Override
public void addDirtyRegion(final JComponent c, final int x, final int y, final int w, final int h) {
checkThreadViolations(c);
super.addDirtyRegion(c, x, y, w, h);
}
private void checkThreadViolations(JComponent c) {
if (!SwingUtilities.isEventDispatchThread() && c.isShowing()) {
boolean repaint = false;
boolean fromSwing = false;
boolean swingKnownNonAwtOperations = false;
final Exception exception = new Exception();
StackTraceElement[] stackTrace = exception.getStackTrace();
for (StackTraceElement st : stackTrace) {
String className = st.getClassName();
String methodName = st.getMethodName();
if (repaint && className.startsWith("javax.swing.")) {
fromSwing = true;
}
if (repaint && "imageUpdate".equals(methodName)) {
swingKnownNonAwtOperations = true;
}
if ("read".equals(methodName) && className.startsWith("javax.swing.JEditorPane") ||
"setCharacterAttributes".equals(methodName) && className.startsWith("javax.swing.text.DefaultStyledDocument")) {
swingKnownNonAwtOperations = true;
break;
}
if ("repaint".equals(methodName)) {
repaint = true;
fromSwing = false;
}
}
if (swingKnownNonAwtOperations) {
return;
}
if (repaint && !fromSwing) {
//no problems here, since repaint() is thread safe
return;
}
//ignore the last processed component
if (SoftReference.dereference(myLastComponent) == c) {
return;
}
myLastComponent = new WeakReference<JComponent>(c);
LOG.warn("Access to realized (ever shown) UI components should be done only from the AWT event dispatch thread," +
" revalidate(), invalidate() & repaint() is ok from any thread", exception);
}
}
}
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