156 lines
4.3 KiB
Java
156 lines
4.3 KiB
Java
/* QtRepaintThread.java -- Repaint thread implementation
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.awt.peer.qt;
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/**
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* This class does repainting of Component back-buffers. It is undesirable to
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* do this directly from the paint callback in QtComponentPeer, because that
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* is executed from the main thread. Thus, if a call is made at the same time
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* which requires execution by the main thread, and this is sharing a lock with
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* paint(), then a deadlock will occur, which must be avoided. In general,
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* the main Qt thread should avoid calling into java code as far as possible.
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*
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*/
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public class QtRepaintThread extends Thread
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{
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static class RepaintComponent
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{
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public QtComponentPeer curr;
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public RepaintComponent next;
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public boolean paintAll;
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public int x, y, w, h;
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public RepaintComponent(QtComponentPeer p)
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{
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curr = p;
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next = null;
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paintAll = true;
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}
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public RepaintComponent(QtComponentPeer p, int x, int y, int w, int h)
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{
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this(p);
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paintAll = false;
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this.x = x;
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this.y = y;
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this.w = w;
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this.h = h;
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}
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}
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RepaintComponent component;
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boolean busy;
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public QtRepaintThread()
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{
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component = null;
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}
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public void run()
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{
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while( true )
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{
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try
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{
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busy = false;
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// Wait for a repaint
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sleep(100);
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busy = true;
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}
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catch (InterruptedException ie)
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{
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while( component != null )
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{
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try
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{
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if( component.paintAll )
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{
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// update the back-buffer.
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component.curr.paintBackBuffer();
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component.curr.QtUpdate(); // trigger a native repaint event
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}
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else
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{
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component.curr.paintBackBuffer(component.x, component.y,
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component.w, component.h);
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component.curr.QtUpdateArea(component.x, component.y,
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component.w, component.h);
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}
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}
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catch (InterruptedException e)
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{
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}
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component = component.next;
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}
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}
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}
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}
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/**
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* Enqueue a component for repainting.
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*/
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public synchronized void queueComponent(QtComponentPeer p)
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{
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if( component == null )
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component = new RepaintComponent(p);
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else
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{
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RepaintComponent r = component;
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while( r.next != null ) r = r.next;
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r.next = new RepaintComponent(p);
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}
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interrupt();
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}
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/**
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* Enqueue a component for repainting.
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*/
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public synchronized void queueComponent(QtComponentPeer p, int x, int y,
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int w, int h)
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{
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if( component == null )
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component = new RepaintComponent(p, x, y, w, h);
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else
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{
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RepaintComponent r = component;
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while( r.next != null ) r = r.next;
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r.next = new RepaintComponent(p, x, y, w, h);
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}
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interrupt();
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}
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}
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