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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: }