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/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.widgets.*;
public class TreeDragSourceEffect extends DragSourceEffect {
Image dragSourceImage = null;
/**
* Creates a new <code>TreeDragSourceEffect</code> to handle drag effect
* from the specified <code>Tree</code>.
*
* @param table the <code>Tree</code> that the user clicks on to initiate the drag
**/
public TreeDragSourceEffect(Tree tree) {
super(tree);
}
/**
* This implementation of <code>dragFinished</code> disposes the image
* that was created in <code>TableDragSourceAdapter.dragStart</code>.
*
* Subclasses that override this method should call <code>super.dragFinsihed(event)</code>
* to dispose the image in the default implementation.
*
* @param event the information associated with the drag finished event
*/
public void dragFinished(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
}
/**
* This implementation of <code>dragStart</code> will create a default
* image that will be used during the drag. The image should be disposed
* when the drag is completed in the <code>TableDragSourceAdapter.dragFinished</code>
* method.
*
* Subclasses that override this method should call <code>super.dragStart(event)</code>
* to use the image from the default implementation.
*
* @param event the information associated with the drag start event
*/
public void dragStart(DragSourceEvent event) {
event.image = getDragSourceImage(event);
}
Image getDragSourceImage(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
Tree tree = (Tree) control;
if (OS.GTK_VERSION < OS.VERSION (2, 2, 0)) return null;
/*
* Bug in GTK. gtk_tree_selection_get_selected_rows() segmentation faults
* in versions smaller than 2.2.4 if the model is NULL. The fix is
* to give a valid pointer instead.
*/
int /*long*/ handle = tree.handle;
int /*long*/ selection = OS.gtk_tree_view_get_selection (handle);
int /*long*/ [] model = OS.GTK_VERSION < OS.VERSION (2, 2, 4) ? new int /*long*/ [1] : null;
int /*long*/ list = OS.gtk_tree_selection_get_selected_rows (selection, model);
if (list == 0) return null;
int count = Math.min(10, OS.g_list_length (list));
Display display = tree.getDisplay();
if (count == 1) {
int /*long*/ path = OS.g_list_nth_data (list, 0);
int /*long*/ pixmap = OS.gtk_tree_view_create_row_drag_icon(handle, path);
dragSourceImage = Image.gtk_new(display, SWT.ICON, pixmap, 0);
} else {
int width = 0, height = 0;
int[] w = new int[1], h = new int[1];
int[] yy = new int[count], hh = new int[count];
int /*long*/ [] pixmaps = new int /*long*/ [count];
GdkRectangle rect = new GdkRectangle ();
for (int i=0; i<count; i++) {
int /*long*/ path = OS.g_list_nth_data (list, i);
OS.gtk_tree_view_get_cell_area (handle, path, 0, rect);
pixmaps[i] = OS.gtk_tree_view_create_row_drag_icon(handle, path);
OS.gdk_drawable_get_size(pixmaps[i], w, h);
width = Math.max(width, w[0]);
height = rect.y + h[0] - yy[0];
yy[i] = rect.y;
hh[i] = h[0];
}
int /*long*/ source = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, -1);
int /*long*/ gcSource = OS.gdk_gc_new(source);
int /*long*/ mask = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, 1);
int /*long*/ gcMask = OS.gdk_gc_new(mask);
GdkColor color = new GdkColor();
color.pixel = 0;
OS.gdk_gc_set_foreground(gcMask, color);
OS.gdk_draw_rectangle(mask, gcMask, 1, 0, 0, width, height);
color.pixel = 1;
OS.gdk_gc_set_foreground(gcMask, color);
for (int i=0; i<count; i++) {
OS.gdk_draw_drawable(source, gcSource, pixmaps[i], 0, 0, 0, yy[i] - yy[0], -1, -1);
OS.gdk_draw_rectangle(mask, gcMask, 1, 0, yy[i] - yy[0], width, hh[i]);
OS.g_object_unref(pixmaps[i]);
}
OS.g_object_unref(gcSource);
OS.g_object_unref(gcMask);
dragSourceImage = Image.gtk_new(display, SWT.ICON, source, mask);
}
OS.g_list_free (list);
return dragSourceImage;
}
}
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