Source for gnu.java.awt.dnd.peer.gtk.GtkDragSourceContextPeer

   1: /* GtkDragSourceContextPeer.java --
   2:    Copyright (C) 2006 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.dnd.peer.gtk;
  40: 
  41: import gnu.java.awt.peer.gtk.GtkGenericPeer;
  42: 
  43: import java.awt.Component;
  44: import java.awt.Cursor;
  45: import java.awt.Image;
  46: import java.awt.Point;
  47: import java.awt.dnd.DragGestureEvent;
  48: import java.awt.dnd.DragSourceContext;
  49: import java.awt.dnd.DragSourceDragEvent;
  50: import java.awt.dnd.DragSourceDropEvent;
  51: import java.awt.dnd.DragSourceEvent;
  52: import java.awt.dnd.InvalidDnDOperationException;
  53: import java.awt.dnd.peer.DragSourceContextPeer;
  54: import java.awt.peer.ComponentPeer;
  55: import java.awt.peer.LightweightPeer;
  56: 
  57: public class GtkDragSourceContextPeer
  58:     extends GtkGenericPeer
  59:     implements DragSourceContextPeer
  60: {
  61:   private ComponentPeer peer;
  62:   private Cursor cursor;
  63:   private DragSourceContext context;
  64:   
  65:   native void nativeStartDrag(Image i, int x, int y, int action, String target);
  66:   native void connectSignals(ComponentPeer comp);
  67:   native void create(ComponentPeer comp);
  68:   native void nativeSetCursor(int cursor);
  69:   
  70:   public GtkDragSourceContextPeer(DragGestureEvent e)
  71:   {
  72:     super(e.getComponent());
  73:     Component comp = e.getComponent();
  74:     peer = getComponentPeer(comp);
  75:     
  76:     create(peer);
  77:     connectSignals(peer);
  78:     cursor = comp.getCursor();
  79:   }
  80:   
  81:   ComponentPeer getComponentPeer(Component c)
  82:   {
  83:     Component curr = c;
  84:     while (curr.getPeer() instanceof LightweightPeer)
  85:       curr = curr.getParent();
  86:     
  87:     if (curr != null)
  88:       return curr.getPeer();
  89:     return null;
  90:   }
  91:   
  92:   public void startDrag(DragSourceContext context, Cursor c, Image i, Point p)
  93:       throws InvalidDnDOperationException
  94:   {   
  95:     this.context = context;
  96:     
  97:     if (p == null)
  98:       p = new Point();
  99:     
 100:     // FIXME: use proper DataFlavor, not "text/plain".
 101:     // Also, add check to determine if dragging.
 102:     
 103:     setCursor(c);
 104:     nativeStartDrag(i, p.x, p.y, context.getTrigger().getDragAction(),
 105:                     "text/plain");
 106:   }
 107: 
 108:   public Cursor getCursor()
 109:   {
 110:     return cursor;
 111:   }
 112: 
 113:   public void setCursor(Cursor c) throws InvalidDnDOperationException
 114:   {
 115:     if (c != null)
 116:       {
 117:         nativeSetCursor(c.getType());
 118:         cursor = c;
 119:       }
 120:   }
 121: 
 122:   public void transferablesFlavorsChanged()
 123:   {
 124:     // Nothing to do here.
 125:   }
 126:   
 127:   /**
 128:    * Called from native code.
 129:    */
 130: 
 131:   public void dragEnter(int action, int modifiers)
 132:   {
 133:     context.dragEnter(new DragSourceDragEvent(context, action,
 134:                                               action
 135:                                                   & context.getSourceActions(),
 136:                                               modifiers));
 137:   }
 138: 
 139:   public void dragExit(int action, int x, int y)
 140:   {
 141:     context.dragExit(new DragSourceEvent(context, x, y));
 142:   }
 143: 
 144:   public void dragDropEnd(int action, boolean success, int x, int y)
 145:   {
 146:     context.dragDropEnd(new DragSourceDropEvent(context, action, success, x, y));
 147:   }
 148: 
 149:   public void dragMouseMoved(int action, int modifiers)
 150:   {
 151:     context.dragMouseMoved(new DragSourceDragEvent(context,
 152:                                                    action,
 153:                                                    action
 154:                                                        & context.getSourceActions(),
 155:                                                    modifiers));
 156:   }
 157: 
 158:   public void dragOver(int action, int modifiers)
 159:   {
 160:     context.dragOver(new DragSourceDragEvent(context, action,
 161:                                              action
 162:                                                  & context.getSourceActions(),
 163:                                              modifiers));
 164:   }
 165: 
 166:   public void dragActionChanged(int newAction, int modifiers)
 167:   {
 168:     context.dropActionChanged(new DragSourceDragEvent(context,
 169:                                                       newAction,
 170:                                                       newAction
 171:                                                           & context.getSourceActions(),
 172:                                                       modifiers));
 173:   }
 174: }