| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.ui.internal.forms.widgets; |
| import org.eclipse.swt.dnd.DragSource; |
| import org.eclipse.swt.dnd.DropTarget; |
| import org.eclipse.swt.widgets.Caret; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Menu; |
| import org.eclipse.swt.widgets.ScrollBar; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.swt.widgets.Widget; |
| |
| /** |
| * Utility class to simplify access to some SWT resources. |
| */ |
| public class SWTUtil { |
| |
| /** |
| * Returns the standard display to be used. The method first checks, if |
| * the thread calling this method has an associated disaply. If so, this |
| * display is returned. Otherwise the method returns the default display. |
| */ |
| public static Display getStandardDisplay() { |
| Display display; |
| display = Display.getCurrent(); |
| if (display == null) |
| display = Display.getDefault(); |
| return display; |
| } |
| |
| /** |
| * Returns the shell for the given widget. If the widget doesn't represent |
| * a SWT object that manage a shell, <code>null</code> is returned. |
| * |
| * @return the shell for the given widget |
| */ |
| public static Shell getShell(Widget widget) { |
| if (widget instanceof Control) |
| return ((Control) widget).getShell(); |
| if (widget instanceof Caret) |
| return ((Caret) widget).getParent().getShell(); |
| if (widget instanceof DragSource) |
| return ((DragSource) widget).getControl().getShell(); |
| if (widget instanceof DropTarget) |
| return ((DropTarget) widget).getControl().getShell(); |
| if (widget instanceof Menu) |
| return ((Menu) widget).getParent().getShell(); |
| if (widget instanceof ScrollBar) |
| return ((ScrollBar) widget).getParent().getShell(); |
| |
| return null; |
| } |
| } |