LayoutUtil.java

/*******************************************************************************
 * Copyright (c) 2004, 2006 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.layout;

import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Shell;

/**
 * Contains various methods for manipulating layouts
 * 
 * @since 3.0
 */
public class LayoutUtil {

    /**
     * Should be called whenever a control's contents have changed. Will
     * trigger a layout parent controls if necessary.
     * 
     * @param changedControl
     */
    public static void resize(Control changedControl) {
        Composite parent = changedControl.getParent();

        Layout parentLayout = parent.getLayout();

        if (parentLayout instanceof ICachingLayout) {
            ((ICachingLayout) parentLayout).flush(changedControl);
        }

        if (parent instanceof Shell) {
            parent.layout(true);
        } else {
            Rectangle currentBounds = parent.getBounds();

            resize(parent);

            // If the parent was resized, then it has already triggered a
            // layout. Otherwise, we need to manually force it to layout again.
            if (currentBounds.equals(parent.getBounds())) {
                parent.layout(true);
            }
        }
    }
}