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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.List;
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import org.eclipse.draw2d.geometry.Dimension;
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import org.eclipse.draw2d.geometry.Rectangle;
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/**
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* Figures using the StackLayout as their layout manager have their children
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* placed on top of one another. Order of placement is determined by the order
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* in which the children were added, first child added placed on the bottom.
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*/
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public class StackLayout extends AbstractHintLayout {
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/**
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* Returns the minimum size required by the input container. This is the
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* size of the largest child of the container, as all other children fit
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* into this size.
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*
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* @see AbstractHintLayout#calculateMinimumSize(IFigure, int, int)
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*/
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protected Dimension calculateMinimumSize(IFigure figure, int wHint,
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int hHint) {
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if (wHint > -1)
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wHint = Math.max(0, wHint - figure.getInsets().getWidth());
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if (hHint > -1)
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hHint = Math.max(0, hHint - figure.getInsets().getHeight());
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Dimension d = new Dimension();
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List children = figure.getChildren();
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IFigure child;
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for (int i = 0; i < children.size(); i++) {
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child = (IFigure) children.get(i);
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if (!isObservingVisibility() || child.isVisible())
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d.union(child.getMinimumSize(wHint, hHint));
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}
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d.expand(figure.getInsets().getWidth(), figure.getInsets().getHeight());
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d.union(getBorderPreferredSize(figure));
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return d;
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}
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/**
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* Calculates and returns the preferred size of the given figure. This is
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* the union of the preferred sizes of the widest and the tallest of all its
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* children.
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*
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* @see AbstractLayout#calculatePreferredSize(IFigure, int, int)
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*/
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protected Dimension calculatePreferredSize(IFigure figure, int wHint,
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int hHint) {
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if (wHint > -1)
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wHint = Math.max(0, wHint - figure.getInsets().getWidth());
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if (hHint > -1)
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hHint = Math.max(0, hHint - figure.getInsets().getHeight());
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Dimension d = new Dimension();
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List children = figure.getChildren();
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IFigure child;
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for (int i = 0; i < children.size(); i++) {
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child = (IFigure) children.get(i);
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if (!isObservingVisibility() || child.isVisible())
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d.union(child.getPreferredSize(wHint, hHint));
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}
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d.expand(figure.getInsets().getWidth(), figure.getInsets().getHeight());
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d.union(getBorderPreferredSize(figure));
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return d;
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}
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/**
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* @see org.eclipse.draw2d.LayoutManager#layout(IFigure)
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*/
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public void layout(IFigure figure) {
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Rectangle r = figure.getClientArea();
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List children = figure.getChildren();
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IFigure child;
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for (int i = 0; i < children.size(); i++) {
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child = (IFigure) children.get(i);
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child.setBounds(r);
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}
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}
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}
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