Source for gnu.java.awt.peer.gtk.GtkCanvasPeer

   1: /* GtkCanvasPeer.java
   2:    Copyright (C) 1998, 1999 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.java.awt.peer.gtk;
  40: 
  41: import java.awt.AWTEvent;
  42: import java.awt.Canvas;
  43: import java.awt.Dimension;
  44: import java.awt.Graphics;
  45: import java.awt.event.PaintEvent;
  46: import java.awt.peer.CanvasPeer;
  47: 
  48: public class GtkCanvasPeer extends GtkComponentPeer implements CanvasPeer
  49: {
  50:   native void create ();
  51: 
  52:   public GtkCanvasPeer (Canvas c)
  53:   {
  54:     super (c);
  55:   }
  56: 
  57:   public Graphics getGraphics ()
  58:   {
  59:     if (GtkToolkit.useGraphics2D ())
  60:       return new GdkGraphics2D (this);
  61:     else
  62:     return new GdkGraphics (this);
  63:   }
  64: 
  65:   public void handleEvent (AWTEvent event)
  66:   {
  67:     int id = event.getID();
  68:       
  69:     switch (id)
  70:       {
  71:       case PaintEvent.PAINT:
  72:       case PaintEvent.UPDATE:
  73:     {
  74:       try 
  75:         {
  76:           Graphics g = getGraphics ();
  77:           g.setClip (((PaintEvent)event).getUpdateRect());
  78:         
  79:           if (id == PaintEvent.PAINT)
  80:         awtComponent.paint (g);
  81:           else
  82:         awtComponent.update (g);
  83:           
  84:           g.dispose ();
  85:         } 
  86:       catch (InternalError e)
  87:         { 
  88:           System.err.println (e);
  89:         }
  90:     }
  91:     break;
  92:       }
  93:   }
  94: 
  95:   /* Preferred size for a drawing widget is always what the user requested */
  96:   public Dimension getPreferredSize ()
  97:   {
  98:     return awtComponent.getSize ();
  99:   }
 100: }