/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal;


public class ContainerPlaceholder extends PartPlaceholder implements ILayoutContainer {
	private static int nextId = 0;
	private ILayoutContainer realContainer;
	/**
	 * ContainerPlaceholder constructor comment.
	 * @param id java.lang.String
	 * @param label java.lang.String
	 */
	public ContainerPlaceholder(String id) {
		super(((id == null) ? "Container Placeholder " + nextId++ : id)); //$NON-NLS-1$
	}
	/**
	 * add method comment.
	 */
	public void add(LayoutPart child) {
		if (!(child instanceof PartPlaceholder))
			return;
		realContainer.add(child);
	}
	/**
	 * See ILayoutContainer::allowBorder
	 */
	public boolean allowsBorder() {
		return true;
	}
	/**
	 * getChildren method comment.
	 */
	public LayoutPart[] getChildren() {
		return realContainer.getChildren();
	}
	/**
	 * getFocus method comment.
	 */
	public LayoutPart getFocus() {
		return null;
	}
	/**
	 * getFocus method comment.
	 */
	public LayoutPart getRealContainer() {
		return (LayoutPart) realContainer;
	}
	/**
	 * isChildVisible method comment.
	 */
	public boolean isChildVisible(LayoutPart child) {
		return false;
	}
	/**
	 * remove method comment.
	 */
	public void remove(LayoutPart child) {
		if (!(child instanceof PartPlaceholder))
			return;
		realContainer.remove(child);
	}
	/**
	 * replace method comment.
	 */
	public void replace(LayoutPart oldChild, LayoutPart newChild) {
		if (!(oldChild instanceof PartPlaceholder) && !(newChild instanceof PartPlaceholder))
			return;
		realContainer.replace(oldChild, newChild);
	}
	/**
	 * setChildVisible method comment.
	 */
	public void setChildVisible(LayoutPart child, boolean visible) {
	}
	/**
	 * setFocus method comment.
	 */
	public void setFocus(LayoutPart child) {
	}
	public void setRealContainer(ILayoutContainer container) {

		if (container == null) {
			// set the parent container of the children back to the real container
			if (realContainer != null) {
				LayoutPart[] children = realContainer.getChildren();
				if (children != null) {
					for (int i = 0, length = children.length; i < length; i++) {
						children[i].setContainer(realContainer);
					}
				}
			}
		} else {
			// replace the real container with this place holder
			LayoutPart[] children = container.getChildren();
			if (children != null) {
				for (int i = 0, length = children.length; i < length; i++) {
					children[i].setContainer(this);
				}
			}
		}

		this.realContainer = container;
	}
	
	public void findSashes(LayoutPart part, PartPane.Sashes sashes) {
		ILayoutContainer container = getContainer();
		
		if (container != null) {
			container.findSashes(this, sashes);
		}
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.internal.ILayoutContainer#allowsAutoFocus()
	 */
	public boolean allowsAutoFocus() {
		return false;
	}
}