| /* QtRepaintThread.java -- Repaint thread implementation |
| Copyright (C) 2005 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.qt; |
| |
| /** |
| * This class does repainting of Component back-buffers. It is undesirable to |
| * do this directly from the paint callback in QtComponentPeer, because that |
| * is executed from the main thread. Thus, if a call is made at the same time |
| * which requires execution by the main thread, and this is sharing a lock with |
| * paint(), then a deadlock will occur, which must be avoided. In general, |
| * the main Qt thread should avoid calling into java code as far as possible. |
| * |
| */ |
| public class QtRepaintThread extends Thread |
| { |
| static class RepaintComponent |
| { |
| public QtComponentPeer curr; |
| public RepaintComponent next; |
| public boolean paintAll; |
| public int x, y, w, h; |
| |
| public RepaintComponent(QtComponentPeer p) |
| { |
| curr = p; |
| next = null; |
| paintAll = true; |
| } |
| |
| public RepaintComponent(QtComponentPeer p, int x, int y, int w, int h) |
| { |
| this(p); |
| paintAll = false; |
| this.x = x; |
| this.y = y; |
| this.w = w; |
| this.h = h; |
| } |
| } |
| |
| RepaintComponent component; |
| boolean busy; |
| |
| public QtRepaintThread() |
| { |
| component = null; |
| } |
| |
| public void run() |
| { |
| while( true ) |
| { |
| try |
| { |
| busy = false; |
| // Wait for a repaint |
| sleep(100); |
| busy = true; |
| } |
| catch (InterruptedException ie) |
| { |
| while( component != null ) |
| { |
| try |
| { |
| if( component.paintAll ) |
| { |
| // update the back-buffer. |
| component.curr.paintBackBuffer(); |
| component.curr.QtUpdate(); // trigger a native repaint event |
| } |
| else |
| { |
| component.curr.paintBackBuffer(component.x, component.y, |
| component.w, component.h); |
| component.curr.QtUpdateArea(component.x, component.y, |
| component.w, component.h); |
| } |
| } |
| catch (InterruptedException e) |
| { |
| } |
| component = component.next; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Enqueue a component for repainting. |
| */ |
| public synchronized void queueComponent(QtComponentPeer p) |
| { |
| if( component == null ) |
| component = new RepaintComponent(p); |
| else |
| { |
| RepaintComponent r = component; |
| while( r.next != null ) r = r.next; |
| r.next = new RepaintComponent(p); |
| } |
| interrupt(); |
| } |
| |
| /** |
| * Enqueue a component for repainting. |
| */ |
| public synchronized void queueComponent(QtComponentPeer p, int x, int y, |
| int w, int h) |
| { |
| if( component == null ) |
| component = new RepaintComponent(p, x, y, w, h); |
| else |
| { |
| RepaintComponent r = component; |
| while( r.next != null ) r = r.next; |
| r.next = new RepaintComponent(p, x, y, w, h); |
| } |
| interrupt(); |
| } |
| } |