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/* 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();

  }

}