- * embeddedComposite = new SWTAWTComposite(parent, SWT.NONE) {
- * protected JComponent createSwingComponent() {
- * scrollPane = new JScrollPane();
- * table = new JTable();
- * scrollPane.setViewportView(table);
- * return scrollPane;
- * }
- * };
- * // For asynchronous AWT UI population of the swing components:
- * embeddedComposite.populate();
- * // and optionally you can wait until the AWT UI population
- * // has finished:
- * embeddedComposite.waitUntilPopulated();
- *
- * // OR:
- *
- * // Do both things above in one call to block until the
- * // AWT UI population is complete:
- * embeddedComposite.syncPopulate();
- *
- * // Both methods assume all invocations are made from the SWT display thread.
- *
- * - * - * @author Tuukka Lehtonen - */ -public abstract class SWTAWTComponent extends Composite { - - private Frame frame; - - private Component awtComponent; - - private JApplet panel; - - private final AtomicBoolean populationStarted = new AtomicBoolean(false); - - private final AtomicBoolean populated = new AtomicBoolean(false); - - private final Semaphore populationSemaphore = new Semaphore(0); - - private static AWTEventListener awtListener = null; - - public SWTAWTComponent(Composite parent, int style) { - super(parent, style | SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.EMBEDDED); - } - - /** - * Create a global AWTEventListener for focus management. - * NOTE: There is really no need to dispose this once it's been initialized - * - */ - private synchronized void initAWTEventListener() { - if(awtListener == null) { - awtListener = new AWTEventListener() { - public void eventDispatched(AWTEvent e) { - if(e.getID() == MouseEvent.MOUSE_PRESSED) { - Object src = e.getSource(); - if(src instanceof Component) { - ((Component)src).requestFocus(); - } - } - }}; - // Execute in AWT thread.. - ThreadUtils.asyncExec(AWTThread.getThreadAccess(), new Runnable() { - @Override - public void run() { - Toolkit.getDefaultToolkit().addAWTEventListener(awtListener, AWTEvent.MOUSE_EVENT_MASK); - } - }); - } - } - - protected Container getContainer() { - return panel; - } - - public Component getAWTComponent() { - return awtComponent; - } - - @Override - public void dispose() { - if (!isDisposed()) { - frame.dispose(); - super.dispose(); - } - } - - /** - * This method must always be called from SWT thread. This prevents the - * possibility of deadlock (reported between AWT and SWT) by servicing SWT - * events while waiting for AWT initialization - */ - public void syncPopulate() { - populate(); - waitUntilPopulated(); - } - - /** - * This method will create an AWT {@link Frame} through {@link SWT_AWT} and - * schedule AWT canvas initialization into the AWT thread. The AWT thread initialization will release - */ - public void populate() { - if (!populationStarted.compareAndSet(false, true)) - throw new IllegalStateException(this + ".populate was invoked multiple times"); - - checkWidget(); - //ITask task = ThreadLogger.getInstance().begin("createFrame"); - createFrame(); - //task.finish(); - scheduleComponentCreation(); - } - - public void waitUntilPopulated() { - if (populated.get()) - return; - - try { - boolean done = false; - while (!done) { - done = populationSemaphore.tryAcquire(10, TimeUnit.MILLISECONDS); - while (!done && getDisplay().readAndDispatch()) { - /* - * Note: readAndDispatch can cause this to be disposed. - */ - if(isDisposed()) return; - done = populationSemaphore.tryAcquire(); - } - } - } catch (InterruptedException e) { - throw new Error("EmbeddedSwingComposite population interrupted for class " + this, e); - } - } - - private void createFrame() { - /* - * Set a Windows specific AWT property that prevents heavyweight - * components from erasing their background. Note that this is a global - * property and cannot be scoped. It might not be suitable for your - * application. - */ - System.setProperty("sun.awt.noerasebackground", "true"); - - if (frame==null) - frame = SWT_AWT.new_Frame(this); - - // This listener clears garbage during resizing, making it looker much cleaner - addControlListener(new CleanResizeListener()); - initAWTEventListener(); - } - - private void scheduleComponentCreation() { - // Create AWT/Swing components on the AWT thread. This is - // especially necessary to avoid an AWT leak bug (6411042). - ThreadUtils.asyncExec(AWTThread.getThreadAccess(), new Runnable() { - @Override - public void run() { - panel = new JApplet(); - panel.setLayout(new GridLayout(1,1,0,0)); - frame.add(panel); - try { - awtComponent = createSwingComponent(); - panel.add(awtComponent); - } finally { - // Needed to support #waitUntilPopulated - populated.set(true); - if (populationSemaphore != null) - populationSemaphore.release(); - } - } - }); - } - - protected abstract Component createSwingComponent(); - - private static class CleanResizeListener extends ControlAdapter { - private Rectangle oldRect = null; - - @Override - public void controlResized(ControlEvent e) { - assert e != null; - assert Display.getCurrent() != null; // On SWT event thread - - // Prevent garbage from Swing lags during resize. Fill exposed areas - // with background color. - Composite composite = (Composite) e.widget; - //Rectangle newRect = composite.getBounds(); - //newRect = composite.getDisplay().map(composite.getParent(), composite, newRect); - Rectangle newRect = composite.getClientArea(); - if (oldRect != null) { - int heightDelta = newRect.height - oldRect.height; - int widthDelta = newRect.width - oldRect.width; - if ((heightDelta > 0) || (widthDelta > 0)) { - GC gc = new GC(composite); - try { - gc.fillRectangle(newRect.x, oldRect.height, newRect.width, heightDelta); - gc.fillRectangle(oldRect.width, newRect.y, widthDelta, newRect.height); - } finally { - gc.dispose(); - } - } - } - oldRect = newRect; - } - } - -} +/******************************************************************************* + * Copyright (c) 2007, 2010 Association for Decentralized Information Management + * in Industry THTH ry. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * VTT Technical Research Centre of Finland - initial API and implementation + *******************************************************************************/ +package org.simantics.scenegraph.example; + +import java.awt.AWTEvent; +import java.awt.Component; +import java.awt.Container; +import java.awt.Frame; +import java.awt.GridLayout; +import java.awt.Toolkit; +import java.awt.event.AWTEventListener; +import java.awt.event.MouseEvent; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; + +import javax.swing.JApplet; + +import org.eclipse.swt.SWT; +import org.eclipse.swt.awt.SWT_AWT; +import org.eclipse.swt.events.ControlAdapter; +import org.eclipse.swt.events.ControlEvent; +import org.eclipse.swt.graphics.GC; +import org.eclipse.swt.graphics.Rectangle; +import org.eclipse.swt.widgets.Composite; +import org.eclipse.swt.widgets.Display; +import org.simantics.utils.threads.AWTThread; +import org.simantics.utils.threads.ThreadUtils; + + +/** + *
+ * embeddedComposite = new SWTAWTComposite(parent, SWT.NONE) {
+ * protected JComponent createSwingComponent() {
+ * scrollPane = new JScrollPane();
+ * table = new JTable();
+ * scrollPane.setViewportView(table);
+ * return scrollPane;
+ * }
+ * };
+ * // For asynchronous AWT UI population of the swing components:
+ * embeddedComposite.populate();
+ * // and optionally you can wait until the AWT UI population
+ * // has finished:
+ * embeddedComposite.waitUntilPopulated();
+ *
+ * // OR:
+ *
+ * // Do both things above in one call to block until the
+ * // AWT UI population is complete:
+ * embeddedComposite.syncPopulate();
+ *
+ * // Both methods assume all invocations are made from the SWT display thread.
+ *
+ * + * + * @author Tuukka Lehtonen + */ +public abstract class SWTAWTComponent extends Composite { + + private Frame frame; + + private Component awtComponent; + + private JApplet panel; + + private final AtomicBoolean populationStarted = new AtomicBoolean(false); + + private final AtomicBoolean populated = new AtomicBoolean(false); + + private final Semaphore populationSemaphore = new Semaphore(0); + + private static AWTEventListener awtListener = null; + + public SWTAWTComponent(Composite parent, int style) { + super(parent, style | SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.EMBEDDED); + } + + /** + * Create a global AWTEventListener for focus management. + * NOTE: There is really no need to dispose this once it's been initialized + * + */ + private synchronized void initAWTEventListener() { + if(awtListener == null) { + awtListener = new AWTEventListener() { + public void eventDispatched(AWTEvent e) { + if(e.getID() == MouseEvent.MOUSE_PRESSED) { + Object src = e.getSource(); + if(src instanceof Component) { + ((Component)src).requestFocus(); + } + } + }}; + // Execute in AWT thread.. + ThreadUtils.asyncExec(AWTThread.getThreadAccess(), new Runnable() { + @Override + public void run() { + Toolkit.getDefaultToolkit().addAWTEventListener(awtListener, AWTEvent.MOUSE_EVENT_MASK); + } + }); + } + } + + protected Container getContainer() { + return panel; + } + + public Component getAWTComponent() { + return awtComponent; + } + + @Override + public void dispose() { + if (!isDisposed()) { + frame.dispose(); + super.dispose(); + } + } + + /** + * This method must always be called from SWT thread. This prevents the + * possibility of deadlock (reported between AWT and SWT) by servicing SWT + * events while waiting for AWT initialization + */ + public void syncPopulate() { + populate(); + waitUntilPopulated(); + } + + /** + * This method will create an AWT {@link Frame} through {@link SWT_AWT} and + * schedule AWT canvas initialization into the AWT thread. The AWT thread initialization will release + */ + public void populate() { + if (!populationStarted.compareAndSet(false, true)) + throw new IllegalStateException(this + ".populate was invoked multiple times"); + + checkWidget(); + //ITask task = ThreadLogger.getInstance().begin("createFrame"); + createFrame(); + //task.finish(); + scheduleComponentCreation(); + } + + public void waitUntilPopulated() { + if (populated.get()) + return; + + try { + boolean done = false; + while (!done) { + done = populationSemaphore.tryAcquire(10, TimeUnit.MILLISECONDS); + while (!done && getDisplay().readAndDispatch()) { + /* + * Note: readAndDispatch can cause this to be disposed. + */ + if(isDisposed()) return; + done = populationSemaphore.tryAcquire(); + } + } + } catch (InterruptedException e) { + throw new Error("EmbeddedSwingComposite population interrupted for class " + this, e); + } + } + + private void createFrame() { + /* + * Set a Windows specific AWT property that prevents heavyweight + * components from erasing their background. Note that this is a global + * property and cannot be scoped. It might not be suitable for your + * application. + */ + System.setProperty("sun.awt.noerasebackground", "true"); + + if (frame==null) + frame = SWT_AWT.new_Frame(this); + + // This listener clears garbage during resizing, making it looker much cleaner + addControlListener(new CleanResizeListener()); + initAWTEventListener(); + } + + private void scheduleComponentCreation() { + // Create AWT/Swing components on the AWT thread. This is + // especially necessary to avoid an AWT leak bug (6411042). + ThreadUtils.asyncExec(AWTThread.getThreadAccess(), new Runnable() { + @Override + public void run() { + panel = new JApplet(); + panel.setLayout(new GridLayout(1,1,0,0)); + frame.add(panel); + try { + awtComponent = createSwingComponent(); + panel.add(awtComponent); + } finally { + // Needed to support #waitUntilPopulated + populated.set(true); + if (populationSemaphore != null) + populationSemaphore.release(); + } + } + }); + } + + protected abstract Component createSwingComponent(); + + private static class CleanResizeListener extends ControlAdapter { + private Rectangle oldRect = null; + + @Override + public void controlResized(ControlEvent e) { + assert e != null; + assert Display.getCurrent() != null; // On SWT event thread + + // Prevent garbage from Swing lags during resize. Fill exposed areas + // with background color. + Composite composite = (Composite) e.widget; + //Rectangle newRect = composite.getBounds(); + //newRect = composite.getDisplay().map(composite.getParent(), composite, newRect); + Rectangle newRect = composite.getClientArea(); + if (oldRect != null) { + int heightDelta = newRect.height - oldRect.height; + int widthDelta = newRect.width - oldRect.width; + if ((heightDelta > 0) || (widthDelta > 0)) { + GC gc = new GC(composite); + try { + gc.fillRectangle(newRect.x, oldRect.height, newRect.width, heightDelta); + gc.fillRectangle(oldRect.width, newRect.y, widthDelta, newRect.height); + } finally { + gc.dispose(); + } + } + } + oldRect = newRect; + } + } + +}