/*******************************************************************************
* Copyright (c) 2000, 2015 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;
}
}