| /* 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; |
| } |
| |
| } |