| /******************************************************************************* |
| * Copyright (c) 2000, 2022 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * 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.*; |
| import org.eclipse.swt.internal.gtk.*; |
| import org.eclipse.swt.widgets.*; |
| |
| class TreeTableCommon { |
| static Image getDragSourceImage(Control control) { |
| Image dragSourceImage; |
| |
| /* |
| * 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 handle = control.handle; |
| long selection = GTK.gtk_tree_view_get_selection (handle); |
| long [] model = null; |
| long list = GTK.gtk_tree_selection_get_selected_rows (selection, model); |
| if (list == 0) return null; |
| int count = Math.min(10, OS.g_list_length (list)); |
| long originalList = list; |
| |
| Display display = control.getDisplay(); |
| if (count == 1) { |
| long path = OS.g_list_nth_data (list, 0); |
| long icon = GTK.gtk_tree_view_create_row_drag_icon (handle, path); |
| dragSourceImage = Image.gtk_new (display, SWT.ICON, icon, 0); |
| GTK.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 [] icons = new long [count]; |
| GdkRectangle rect = new GdkRectangle (); |
| for (int i=0; i<count; i++) { |
| long path = OS.g_list_data (list); |
| GTK.gtk_tree_view_get_cell_area (handle, path, 0, rect); |
| icons[i] = GTK.gtk_tree_view_create_row_drag_icon(handle, path); |
| switch (Cairo.cairo_surface_get_type(icons[i])) { |
| case Cairo.CAIRO_SURFACE_TYPE_IMAGE: |
| w[0] = Cairo.cairo_image_surface_get_width(icons[i]); |
| h[0] = Cairo.cairo_image_surface_get_height(icons[i]); |
| break; |
| case Cairo.CAIRO_SURFACE_TYPE_XLIB: |
| w[0] = Cairo.cairo_xlib_surface_get_width(icons[i]); |
| h[0] = Cairo.cairo_xlib_surface_get_height(icons[i]); |
| break; |
| } |
| width = Math.max(width, w[0]); |
| height = rect.y + h[0] - yy[0]; |
| yy[i] = rect.y; |
| hh[i] = h[0]; |
| list = OS.g_list_next (list); |
| GTK.gtk_tree_path_free (path); |
| } |
| long surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, width, height); |
| if (surface == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| long 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); |
| } |
| OS.g_list_free (originalList); |
| return dragSourceImage; |
| } |
| } |