| /******************************************************************************* |
| * Copyright (c) 2009 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.gmf.runtime.common.ui.util; |
| |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.ui.IWorkbenchWindow; |
| import org.eclipse.ui.PlatformUI; |
| |
| /** |
| * Utility methods to work with Display object |
| * |
| * @author aboyko |
| * @since 1.2 |
| */ |
| public class DisplayUtils { |
| |
| /** |
| * Returns a non-null instance of Display object. Tries to find the Display |
| * object for the current thread first and if it fails tries to get: |
| * <li> Workbench display if the workbench running |
| * <li> Default display object |
| * |
| * @return non-null Display object |
| * @since 1.2 |
| */ |
| public static Display getDisplay() { |
| Display display = Display.getCurrent(); |
| if (display == null && PlatformUI.isWorkbenchRunning()) { |
| display = PlatformUI.getWorkbench().getDisplay(); |
| } |
| return display != null ? display : Display.getDefault(); |
| } |
| |
| /** |
| * Attempts to return the default shell. If it cannot return the default |
| * shell, it returns the shell of the first workbench window that has shell. |
| * |
| * @return The shell |
| * @since 1.2 |
| */ |
| public static Shell getDefaultShell() { |
| Shell shell = null; |
| |
| try { |
| shell = Display.getDefault().getActiveShell(); |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| try { |
| if (shell == null) { |
| IWorkbenchWindow activeWindow = PlatformUI.getWorkbench() |
| .getActiveWorkbenchWindow(); |
| if (activeWindow != null) |
| shell = activeWindow.getShell(); |
| |
| } |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| if (shell == null) { |
| IWorkbenchWindow[] windows = PlatformUI.getWorkbench() |
| .getWorkbenchWindows(); |
| for (int i = 0; shell == null && i < windows.length; i++) { |
| shell = windows[i].getShell(); |
| } |
| } |
| |
| return shell; |
| } |
| |
| /** |
| * Clear the event queue |
| * |
| * @since 1.2 |
| */ |
| public static void clearEventLoop() { |
| while (getDisplay().readAndDispatch()); |
| } |
| |
| } |