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/*******************************************************************************
 * Copyright (c) 2000, 2010 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.draw2d;

import org.eclipse.draw2d.geometry.Rectangle;

/**
 * A figure that allows its children to extend into negative coordinates. This
 * figure must be placed in a {@link org.eclipse.draw2d.FreeformViewport}. Also,
 * you shouldn't call {@link IFigure#setBounds(Rectangle)} on this figure. The
 * bounds will be calculated based on the extent of its children. A
 * FreeformFigure's bounds will be the smallest rectangle that will contain all
 * of its children.
 */
public interface FreeformFigure extends IFigure {

	/**
	 * Adds a FreeformListener to this FreeformFigure.
	 * 
	 * @param listener
	 *            the listener
	 */
	void addFreeformListener(FreeformListener listener);

	/**
	 * Notifies listeners that the freeform extent (i.e. bounds) has changed.
	 */
	void fireExtentChanged();

	/**
	 * Returns the freeform extent, essentially the bounds of the
	 * FreeformFigure. This is based on the extent of its children.
	 * 
	 * @return the freeform extent
	 */
	Rectangle getFreeformExtent();

	/**
	 * Removes the given listener from this FreeformFigure.
	 * 
	 * @param listener
	 *            the listener
	 */
	void removeFreeformListener(FreeformListener listener);

	/**
	 * Sets the freeform bounds of this FreeformFigure.
	 * 
	 * @param bounds
	 *            the new freeform bounds
	 */
	void setFreeformBounds(Rectangle bounds);

}