/*******************************************************************************
* 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.jface.wizard;
import org.eclipse.swt.graphics.Point;
/**
* A wizard node acts a placeholder for a real wizard in a wizard
* selection page. It is done in such a way that the actual creation
* of a wizard can be deferred until the wizard is really needed.
* <p>
* When a wizard node comes into existence, its wizard may or may
* not have been created yet; <code>isContentCreated</code> can
* be used to determine which. A node may be asked for its wizard
* using <code>getWizard</code>, which will force it to be created
* if required. Once the client is done with a wizard node, its
* <code>dispose</code>method must be called to free up the wizard;
* once disposes, the node should no longer be used.
* </p>
* <p>
* This interface should be implemented by clients wishing to
* support this kind of wizard placeholder in a wizard selection page.
* </p>
*
* @see WizardSelectionPage
*/
public interface IWizardNode {
/**
* Disposes the wizard managed by this node. Does nothing
* if the wizard has not been created.
* <p>
* This is the last message that should ever be sent to this node.
* </p>
*/
public void dispose();
/**
* Returns the extent of the wizard for this node.
* <p>
* If the content has not yet been created, calling this method
* does not trigger the creation of the wizard. This allows
* this node to suggest an extent in advance of actually creating
* the wizard.
* </p>
*
* @return the extent, or <code>(-1, -1)</code> extent is not known
*/
public Point getExtent();
/**
* Returns the wizard this node stands for.
* <p>
* If the content has not been created beforehand, calling this
* method triggers the creation of the wizard and caches it so that
* the identical wizard object is returned on subsequent calls.
* </p>
*
* @return the wizard
*/
public IWizard getWizard();
/**
* Returns whether a wizard has been created for this node.
*
* @return <code>true</code> if a wizard has been created,
* and <code>false</code> otherwise
*/
public boolean isContentCreated();
}