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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/swing/SwingContainerPeer.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/swing/SwingContainerPeer.java | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/swing/SwingContainerPeer.java b/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/swing/SwingContainerPeer.java new file mode 100644 index 000000000..2d5d97ff1 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/awt/peer/swing/SwingContainerPeer.java @@ -0,0 +1,378 @@ +/* SwingContainerPeer.java -- A Swing based peer for AWT containers + Copyright (C) 2006, 2007 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.awt.peer.swing; + +import gnu.classpath.SystemProperties; + +import java.awt.Component; +import java.awt.Container; +import java.awt.Graphics; +import java.awt.Image; +import java.awt.Insets; +import java.awt.Rectangle; +import java.awt.event.KeyEvent; +import java.awt.event.MouseEvent; +import java.awt.peer.ComponentPeer; +import java.awt.peer.ContainerPeer; +import java.util.Iterator; +import java.util.LinkedList; + +/** + * A peer for Container to be used with the Swing based AWT peers. + * + * @author Roman Kennke (kennke@aicas.com) + */ +public class SwingContainerPeer + extends SwingComponentPeer + implements ContainerPeer +{ + + /** + * Stores all heavyweight descendents of the container. This is used + * in {@link #peerPaintChildren(Graphics)}. + */ + private LinkedList heavyweightDescendents; + + /** + * The backbuffer used for painting UPDATE events. + */ + private Image backbuffer; + + /** + * Creates a new SwingContainerPeer. + * + * @param awtCont + */ + public SwingContainerPeer(Container awtCont) + { + heavyweightDescendents = new LinkedList(); + } + + /** + * Registers a heavyweight descendent. This is then painted by + * {@link #peerPaintChildren(Graphics)}. + * + * @param comp the descendent to register + * + * @see #peerPaintChildren(Graphics) + * @see #removeHeavyweightDescendent(Component) + */ + protected synchronized void addHeavyweightDescendent(Component comp) + { + heavyweightDescendents.add(comp); + focusOwner = null; + } + + /** + * Unregisters a heavyweight descendent. + * + * @param comp the descendent to unregister + * + * @see #peerPaintChildren(Graphics) + * @see #addHeavyweightDescendent(Component) + */ + protected synchronized void removeHeavyweightDescendent(Component comp) + { + heavyweightDescendents.remove(comp); + focusOwner = null; + } + + /** + * Returns an array of all registered heavyweight descendents. + * + * @return all registered heavyweight descendents + */ + protected Component[] getHeavyweightDescendents() + { + Component[] heavyweights = new Component[heavyweightDescendents.size()]; + heavyweights = (Component[]) heavyweightDescendents.toArray(heavyweights); + return heavyweights; + } + + /** + * Returns the insets of the container. + * + * This is implemented to return the insets of the Swing container. + * + * @return the insets of the container + */ + public Insets insets() + { + Insets retVal; + if (swingComponent != null) + retVal = swingComponent.getJComponent().getInsets(); + else + retVal = new Insets(0, 0, 0, 0); + return retVal; + } + + /** + * Returns the insets of the container. + * + * This is implemented to return the insets of the Swing container. + * + * @return the insets of the container + */ + public Insets getInsets() + { + return insets(); + } + + /** + * Called before the validation of this containers begins. + */ + public void beginValidate() + { + // Nothing to do here. + } + + /** + * Called after the validation of this containers ended. + */ + public void endValidate() + { + // Nothing to do here. + } + + /** + * Called before the layout of this containers begins. + */ + public void beginLayout() + { + // Nothing to do here. + } + + /** + * Called after the layout of this containers ended. + */ + public void endLayout() + { + // Nothing to do here. + } + + /** + * Returns <code>false</code> unconditionally. This method is not used at + * the moment. + * + * @return <code>false</code> + */ + public boolean isPaintPending() + { + return false; + } + + /** + * Returns <code>false</code> unconditionally. This method is not used at + * the moment. + * + * @return <code>false</code> + */ + public boolean isRestackSupported() + { + return false; + } + + /** + * This method is not used at the moment. + */ + public void cancelPendingPaint(int x, int y, int width, int height) + { + // Nothing to do here. + } + + /** + * This method is not used at the moment. + */ + public void restack() + { + // Nothing to do here. + } + + /** + * Performs the super behaviour (call peerPaintComponent() and + * awtComponent.paint()), and forwards the paint request to the heavyweight + * descendents of the container. + */ + protected void peerPaint(Graphics g, boolean update) + { + if (isDoubleBuffering()) + { + int width = awtComponent.getWidth(); + int height = awtComponent.getHeight(); + if (backbuffer == null + || backbuffer.getWidth(awtComponent) < width + || backbuffer.getHeight(awtComponent) < height) + backbuffer = awtComponent.createImage(width, height); + Graphics g2 = backbuffer.getGraphics(); + Rectangle clip = g.getClipRect(); + try + { + g2.setClip(clip); + super.peerPaint(g2, update); + peerPaintChildren(g2); + } + finally + { + g2.dispose(); + } + g.drawImage(backbuffer, 0, 0, awtComponent); + } + else + { + super.peerPaint(g, update); + peerPaintChildren(g); + } + } + + /** + * Determines if we should do double buffering or not. + * + * @return if we should do double buffering or not + */ + private boolean isDoubleBuffering() + { + Object prop = + SystemProperties.getProperty("gnu.awt.swing.doublebuffering", "false"); + return prop.equals("true"); + } + + /** + * Paints any heavyweight child components. + * + * @param g the graphics to use for painting + */ + protected synchronized void peerPaintChildren(Graphics g) + { + // TODO: Is this the right painting order? + for (Iterator i = heavyweightDescendents.iterator(); i.hasNext();) + { + Component child = (Component) i.next(); + ComponentPeer peer = child.getPeer(); + + if (peer instanceof SwingComponentPeer && child.isVisible()) + { + // TODO: The translation here doesn't work for deeper + // nested children. Fix this! + Graphics g2 = g.create(child.getX(), child.getY(), + child.getWidth(), child.getHeight()); + try + { + // update() is only called for the topmost component if + // necessary, all other components only get paint() called. + ((SwingComponentPeer) peer).peerPaint(g2, false); + } + finally + { + g2.dispose(); + } + } + } + } + + /** + * Handles mouse events by dispatching it to the correct component. + * + * @param ev the mouse event + */ + protected void handleMouseEvent(MouseEvent ev) + { + Component comp = awtComponent.getComponentAt(ev.getPoint()); + if(comp == null) comp = awtComponent; + ComponentPeer peer = comp.getPeer(); + if (awtComponent != comp && !comp.isLightweight() && peer instanceof SwingComponentPeer) + { + ev.translatePoint(comp.getX(), comp.getY()); + ev.setSource(comp); + ((SwingComponentPeer) peer).handleMouseEvent(ev); + } + } + + /** + * Handles mouse events by dispatching it to the correct component. + * + * @param ev the mouse event + */ + protected void handleMouseMotionEvent(MouseEvent ev) + { + Component comp = awtComponent.getComponentAt(ev.getPoint()); + if (comp != null) + { + ComponentPeer peer = comp.getPeer(); + if (awtComponent != comp && !comp.isLightweight() && peer instanceof SwingComponentPeer) + { + ev.translatePoint(comp.getX(), comp.getY()); + ((SwingComponentPeer) peer).handleMouseMotionEvent(ev); + } + } + } + + /** + * Handles key events on the component. This is usually forwarded to the + * SwingComponent's processKeyEvent() method. + * + * @param e the key event + */ + protected void handleKeyEvent(KeyEvent e) + { + Component owner = getFocusOwner(); + if(owner != null) + owner.getPeer().handleEvent(e); + else + super.handleKeyEvent(e); + } + + private Component focusOwner = null; + + private Component getFocusOwner() + { + if(focusOwner == null) + { + for(Iterator iter=heavyweightDescendents.iterator(); iter.hasNext();) + { + Component child = (Component) iter.next(); + if(child.isFocusable()) + { + focusOwner = child; + break; + } + } + } + return focusOwner; + } + +} |