gtkcomponentpeer.java

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/* GtkComponentPeer.java -- Implements ComponentPeer with GTK
   Copyright (C) 1998, 1999, 2002, 2004, 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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.gtk;

import java.awt.AWTEvent;
import java.awt.BufferCapabilities;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Insets;
import java.awt.ItemSelectable;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.FocusEvent;
import java.awt.event.ItemEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.PaintEvent;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.image.VolatileImage;
import java.awt.peer.ComponentPeer;

public class GtkComponentPeer extends GtkGenericPeer
  implements ComponentPeer
{
  Component awtComponent;

  Insets insets;

  boolean isInRepaint;

  /* this isEnabled differs from Component.isEnabled, in that it
     knows if a parent is disabled.  In that case Component.isEnabled 
     may return true, but our isEnabled will always return false */
  native boolean isEnabled ();
  static native boolean modalHasGrab();

  native int[] gtkWidgetGetForeground ();
  native int[] gtkWidgetGetBackground ();
  native void gtkWidgetGetDimensions (int[] dim);
  native void gtkWidgetGetPreferredDimensions (int[] dim);
  native void gtkWidgetGetLocationOnScreen (int[] point);
  native void gtkWidgetSetCursor (int type);
  native void gtkWidgetSetBackground (int red, int green, int blue);
  native void gtkWidgetSetForeground (int red, int green, int blue);
  native void gtkWidgetSetSensitive (boolean sensitive);
  native void gtkWidgetSetParent (ComponentPeer parent);
  native void gtkWidgetRequestFocus ();
  native void gtkWidgetDispatchKeyEvent (int id, long when, int mods,
                                         int keyCode, int keyLocation);

  native boolean isRealized ();

  void create ()
  {
    throw new RuntimeException ();
  }

  native void connectSignals ();

  protected GtkComponentPeer (Component awtComponent)
  {
    super (awtComponent);
    this.awtComponent = awtComponent;
    insets = new Insets (0, 0, 0, 0);

    create ();

    connectSignals ();

    if (awtComponent.getForeground () != null)
      setForeground (awtComponent.getForeground ());
    if (awtComponent.getBackground () != null)
      setBackground (awtComponent.getBackground ());
    if (awtComponent.getFont() != null)
      setFont(awtComponent.getFont());

    Component parent = awtComponent.getParent ();

    // Only set our parent on the GTK side if our parent on the AWT
    // side is not showing.  Otherwise the gtk peer will be shown
    // before we've had a chance to position and size it properly.
    if (awtComponent instanceof Window
        || (parent != null && ! parent.isShowing ()))
      setParentAndBounds ();
  }

  void setParentAndBounds ()
  {
    setParent ();

    setComponentBounds ();

    setVisibleAndEnabled ();
  }

  void setParent ()
  {
    ComponentPeer p;
    Component component = awtComponent;
    do
      {
        component = component.getParent ();
        p = component.getPeer ();
      }
    while (p instanceof java.awt.peer.LightweightPeer);

    if (p != null)
      gtkWidgetSetParent (p);
  }

  void beginNativeRepaint ()
  {
    isInRepaint = true;
  }

  void endNativeRepaint ()
  {
    isInRepaint = false;
  }

  /*
   * Set the bounds of this peer's AWT Component based on dimensions
   * returned by the native windowing system.  Most Components impose
   * their dimensions on the peers which is what the default
   * implementation does.  However some peers, like GtkFileDialogPeer,
   * need to pass their size back to the AWT Component.
   */
  void setComponentBounds ()
  {
    Rectangle bounds = awtComponent.getBounds ();

    if (bounds.x == 0 && bounds.y == 0
        && bounds.width == 0 && bounds.height == 0)
      return;

    setBounds (bounds.x, bounds.y, bounds.width, bounds.height);
  }

  void setVisibleAndEnabled ()
  {
    setVisible (awtComponent.isVisible ());
    setEnabled (awtComponent.isEnabled ());
  }

  public int checkImage (Image image, int width, int height, 
			 ImageObserver observer) 
  {
    GtkImage i = (GtkImage) image;
    return i.checkImage ();
  }

  public Image createImage (ImageProducer producer) 
  {
    GtkImage image = new GtkImage (producer, null);
    producer.startProduction (image);
    return image;
  }

  public Image createImage (int width, int height)
  {
    Graphics g;
    if (GtkToolkit.useGraphics2D ())
      {
        Graphics2D g2 = new GdkGraphics2D (width, height);
        g2.setBackground (getBackground ());
        g = g2;
      }
    else
      g = new GdkGraphics (width, height);

    g.setColor(getBackground());
    g.fillRect(0, 0, width, height);

    return new GtkOffScreenImage (null, g, width, height);
  }

  public void disable () 
  {
    setEnabled (false);
  }

  public void enable () 
  {
    setEnabled (true);
  }

  public ColorModel getColorModel () 
  {
    return ColorModel.getRGBdefault ();
  }

  public FontMetrics getFontMetrics (Font font)
  {
    return getToolkit().getFontMetrics(font);
  }

  public Graphics getGraphics ()
  {
    if (GtkToolkit.useGraphics2D ())
        return new GdkGraphics2D (this);
    else
        return new GdkGraphics (this);
  }

  public Point getLocationOnScreen () 
  { 
    int point[] = new int[2];
    gtkWidgetGetLocationOnScreen (point);
    return new Point (point[0], point[1]);
  }

  public Dimension getMinimumSize () 
  {
    return minimumSize ();
  }

  public Dimension getPreferredSize ()
  {
    return preferredSize ();
  }

  public Toolkit getToolkit ()
  {
    return Toolkit.getDefaultToolkit();
  }
  
  public void handleEvent (AWTEvent event)
  {
    int id = event.getID();
    KeyEvent ke = null;

    switch (id)
      {
      case PaintEvent.PAINT:
      case PaintEvent.UPDATE:
        {
          try 
            {
              Graphics g = getGraphics ();
          
              // Some peers like GtkFileDialogPeer are repainted by Gtk itself
              if (g == null)
                break;

              g.setClip (((PaintEvent) event).getUpdateRect());

              if (id == PaintEvent.PAINT)
                awtComponent.paint (g);
              else
                awtComponent.update (g);

              g.dispose ();
            }
          catch (InternalError e)
            {
              System.err.println (e);
            }
        }
        break;
      case KeyEvent.KEY_PRESSED:
        ke = (KeyEvent) event;
        gtkWidgetDispatchKeyEvent (ke.getID (), ke.getWhen (), ke.getModifiersEx (),
                                   ke.getKeyCode (), ke.getKeyLocation ());
        break;
      case KeyEvent.KEY_RELEASED:
        ke = (KeyEvent) event;
        gtkWidgetDispatchKeyEvent (ke.getID (), ke.getWhen (), ke.getModifiersEx (),