/*******************************************************************************
* Copyright (c) 2000, 2013 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.cairo.Cairo;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.widgets.*;
/**
* This class provides default implementations to display a source image
* when a drag is initiated from a <code>Table</code>.
*
* <p>Classes that wish to provide their own source image for a <code>Table</code> can
* extend the <code>TableDragSourceEffect</code> class, override the
* <code>TableDragSourceEffect.dragStart</code> method and set the field
* <code>DragSourceEvent.image</code> with their own image.</p>
*
* Subclasses that override any methods of this class must call the corresponding
* <code>super</code> method to get the default drag source effect implementation.
*
* @see DragSourceEffect
* @see DragSourceEvent
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.3
*/
public class TableDragSourceEffect extends DragSourceEffect {
Image dragSourceImage = null;
/**
* Creates a new <code>TableDragSourceEffect</code> to handle drag effect
* from the specified <code>Table</code>.
*
* @param table the <code>Table</code> that the user clicks on to initiate the drag
*/
public TableDragSourceEffect(Table table) {
super(table);
}
/**
* This implementation of <code>dragFinished</code> disposes the image
* that was created in <code>TableDragSourceEffect.dragStart</code>.
*
* Subclasses that override this method should call <code>super.dragFinished(event)</code>
* to dispose the image in the default implementation.
*
* @param event the information associated with the drag finished event
*/
@Override
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>TableDragSourceEffect.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
*/
@Override
public void dragStart(DragSourceEvent event) {
event.image = getDragSourceImage(event);
}
Image getDragSourceImage(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
Table table = (Table) control;
//TEMPORARY CODE
if (table.isListening(SWT.EraseItem) || table.isListening (SWT.PaintItem)) 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.
*/
long /*int*/ handle = table.handle;
long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
long /*int*/ [] model = null;
long /*int*/ 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 = table.getDisplay();
if (count == 1) {
long /*int*/ path = OS.g_list_nth_data (list, 0);
long /*int*/ icon = OS.gtk_tree_view_create_row_drag_icon (handle, path);
dragSourceImage = Image.gtk_new (display, SWT.ICON, icon, 0);
OS.gtk_tree_path_free (path);
} else {
int width = 0, height = 0;
int[] w = new int[1], h = new int[1];
int[] yy = new int[count], hh = new int[count];
long /*int*/ [] icons = new long /*int*/ [count];
GdkRectangle rect = new GdkRectangle ();
for (int i=0; i<count; i++) {
long /*int*/ path = OS.g_list_nth_data (list, i);
OS.gtk_tree_view_get_cell_area (handle, path, 0, rect);
icons[i] = OS.gtk_tree_view_create_row_drag_icon(handle, path);
if (OS.GTK3) {
w[0] = Cairo.cairo_xlib_surface_get_width(icons[i]);
h[0] = Cairo.cairo_xlib_surface_get_height(icons[i]);
} else if (OS.GTK_VERSION >= OS.VERSION(2, 24, 0)) {
OS.gdk_pixmap_get_size(icons[i], w, h);
} else {
OS.gdk_drawable_get_size(icons[i], w, h);
}
width = Math.max(width, w[0]);
height = rect.y + h[0] - yy[0];
yy[i] = rect.y;
hh[i] = h[0];
OS.gtk_tree_path_free (path);
}
if (OS.GTK3) {
long /*int*/ surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, width, height);
if (surface == 0) SWT.error(SWT.ERROR_NO_HANDLES);
long /*int*/ cairo = Cairo.cairo_create(surface);
if (cairo == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_set_operator(cairo, Cairo.CAIRO_OPERATOR_SOURCE);
for (int i=0; i<count; i++) {
Cairo.cairo_set_source_surface (cairo, icons[i], 2, yy[i] - yy[0] + 2);
Cairo.cairo_rectangle(cairo, 0, yy[i] - yy[0], width, hh[i]);
Cairo.cairo_fill(cairo);
Cairo.cairo_surface_destroy(icons[i]);
}
Cairo.cairo_destroy(cairo);
dragSourceImage = Image.gtk_new (display, SWT.ICON, surface, 0);
} else {
long /*int*/ source = OS.gdk_pixmap_new(OS.gdk_get_default_root_window(), width, height, -1);
long /*int*/ gcSource = OS.gdk_gc_new(source);
long /*int*/ mask = OS.gdk_pixmap_new(OS.gdk_get_default_root_window(), width, height, 1);
long /*int*/ 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, icons[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(icons[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;
}
}