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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java b/libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java new file mode 100644 index 000000000..6861be8fc --- /dev/null +++ b/libjava/classpath/gnu/java/awt/peer/qt/QtRepaintThread.java @@ -0,0 +1,156 @@ +/* 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(); + } +} |