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/*******************************************************************************
* Copyright (c) 2013, 2017 Obeo 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:
* Obeo - initial API and implementation
* Philip Langer - check if control is disposed before redraw
*******************************************************************************/
package org.eclipse.emf.compare.rcp.ui.internal.util;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
/**
* Utility class for running operation in the UI-Thread if not already within it.
*
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public final class SWTUtil {
private SWTUtil() {
// prevent instantiation.
}
/**
* Causes the run() method of the runnable to be invoked by the user-interface thread at the next
* reasonable opportunity. The caller of this method continues to run in parallel, and is not notified
* when the runnable has completed.
*
* @param runnable
* runnable code to run on the user-interface thread.
*/
public static void safeAsyncExec(final Runnable runnable) {
if (Display.getCurrent() != null) {
Display.getCurrent().asyncExec(runnable);
} else {
Display.getDefault().asyncExec(runnable);
}
}
/**
* Causes the run() method of the runnable to be invoked by the user-interface thread at the next
* reasonable opportunity. The thread which calls this method is suspended until the runnable completes.
*
* @param runnable
* runnable code to run on the user-interface thread.
*/
public static void safeSyncExec(final Runnable runnable) {
if (Display.getCurrent() != null) {
runnable.run();
} else {
Display.getDefault().syncExec(runnable);
}
}
/**
* Run {@link Viewer#refresh()} on the given viewer.
*
* @param viewer
* the viewer to refresh.
* @param async
* whether the thread which calls this method is not suspended until the runnable completes.
* @param checkDisposed
* whether the viewer's control dispose state has to be checked before refresh.
*/
public static void safeRefresh(final Viewer viewer, boolean async, final boolean checkDisposed) {
Runnable runnable = new Runnable() {
public void run() {
if (checkDisposed) {
Control control = viewer.getControl();
if (control != null && !control.isDisposed()) {
viewer.refresh();
}
} else {
viewer.refresh();
}
}
};
if (async) {
safeAsyncExec(runnable);
} else {
safeSyncExec(runnable);
}
}
/**
* Run {@link Control#redraw()} on the given viewer.
*
* @param redraw
* the control to redraw.
* @param async
* whether the thread which calls this method is not suspended until the runnable completes.
*/
public static void safeRedraw(final Control control, boolean async) {
Runnable runnable = new Runnable() {
public void run() {
if (!control.isDisposed()) {
control.redraw();
}
}
};
if (async) {
safeAsyncExec(runnable);
} else {
safeSyncExec(runnable);
}
}
}
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