Image getDragSourceImage(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
Table table = (Table) control;
if (OS.GTK_VERSION < OS.VERSION(2, 2, 0)) return null;
// 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 = OS.GTK_VERSION < OS.VERSION(2, 2, 4) ? new long /*int*/[1] : 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*/ 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];
long /*int*/[] pixmaps = 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);
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];
}
long /*int*/ source = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, -1);
long /*int*/ gcSource = OS.gdk_gc_new(source);
long /*int*/ mask = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), 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, 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;
}
