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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.eclipse.draw2d.geometry.Dimension;
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/**
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* Figures using a DelegatingLayout as their layout manager give location
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* responsibilities to their children. The children of a Figure using a
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* DelegatingLayout should have a {@link Locator Locator} as a constraint whose
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* {@link Locator#relocate(IFigure target) relocate} method is responsible for
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* placing the child.
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*/
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public class DelegatingLayout extends AbstractLayout {
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private Map constraints = new HashMap();
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/**
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* Calculates the preferred size of the given Figure. For the
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* DelegatingLayout, this is the largest width and height values of the
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* passed Figure's children.
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*
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* @param parent
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* the figure whose preferred size is being calculated
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* @param wHint
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* the width hint
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* @param hHint
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* the height hint
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* @return the preferred size
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* @since 2.0
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*/
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protected Dimension calculatePreferredSize(IFigure parent, int wHint,
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int hHint) {
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List children = parent.getChildren();
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Dimension d = new Dimension();
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for (int i = 0; i < children.size(); i++) {
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IFigure child = (IFigure) children.get(i);
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d.union(child.getPreferredSize());
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}
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return d;
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}
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/**
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* @see org.eclipse.draw2d.LayoutManager#getConstraint(org.eclipse.draw2d.IFigure)
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*/
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public Object getConstraint(IFigure child) {
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return constraints.get(child);
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}
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/**
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* Lays out the given figure's children based on their {@link Locator}
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* constraint.
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*
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* @param parent
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* the figure whose children should be layed out
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*/
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public void layout(IFigure parent) {
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List children = parent.getChildren();
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for (int i = 0; i < children.size(); i++) {
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IFigure child = (IFigure) children.get(i);
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Locator locator = (Locator) constraints.get(child);
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if (locator != null) {
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locator.relocate(child);
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}
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}
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}
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/**
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* Removes the locator for the given figure.
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*
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* @param child
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* the child being removed
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*/
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public void remove(IFigure child) {
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constraints.remove(child);
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}
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/**
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* Sets the constraint for the given figure.
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*
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* @param figure
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* the figure whose contraint is being set
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* @param constraint
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* the new constraint
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*/
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public void setConstraint(IFigure figure, Object constraint) {
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super.setConstraint(figure, constraint);
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if (constraint != null)
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constraints.put(figure, constraint);
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}
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}
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