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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.text;

/**
 * A FlowBox that can contain other FlowBoxes. The contained FlowBoxes are
 * called fragments.
 * 
 * @author hudsonr
 * @since 2.1
 */
public abstract class CompositeBox extends FlowBox {

	int recommendedWidth = -1;

	/**
	 * Adds the given box and updates properties of this composite box.
	 * 
	 * @param box
	 *            the child being added
	 */
	public abstract void add(FlowBox box);

	abstract int getBottomMargin();

	/**
	 * Returns the recommended width for this CompositeBox.
	 * 
	 * @return the recommended width
	 */
	public int getRecommendedWidth() {
		return recommendedWidth;
	}

	abstract int getTopMargin();

	/**
	 * Sets the recommended width for this CompositeBox.
	 * 
	 * @param w
	 *            the width
	 */
	public void setRecommendedWidth(int w) {
		recommendedWidth = w;
	}

	/**
	 * Positions the box vertically by setting the y coordinate for the top of
	 * the content of the line. For internal use only.
	 * 
	 * @param top
	 *            the y coordinate
	 * @since 3.1
	 */
	public abstract void setLineTop(int top);

}