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/*******************************************************************************
* Copyright (c) 2001, 2004 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.wst.xsd.ui.internal.graph.figures;
import java.util.Iterator;
import java.util.List;
import org.eclipse.draw2d.AbstractLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
/**
* Figures using the StackLayout as their layout manager have
* their children placed on top of one another. Order of
* placement is determined by the order in which the children
* were added, first child added placed on the bottom.
*/
public class CenterLayout
extends AbstractLayout
{
protected int spacing;
public CenterLayout(){}
public CenterLayout(int spacing){ this.spacing = spacing; }
/**
* Calculates and returns the preferred size of the input container.
* This is the size of the largest child of the container, as all
* other children fit into this size.
*
* @param figure Container figure for which preferred size is required.
* @return The preferred size of the input figure.
*/
protected Dimension calculatePreferredSize(IFigure figure, int w, int h){
Dimension d = calculatePreferredClientAreaSize(figure);
/*d.expand(figure.getInsets().getWidth(),
figure.getInsets().getHeight()); */
d.expand(w,
h);
d.union(getBorderPreferredSize(figure));
return d;
}
protected Dimension calculatePreferredClientAreaSize(IFigure figure){
Dimension d = new Dimension();
List children = figure.getChildren();
for (Iterator i = children.iterator(); i.hasNext(); )
{
IFigure child = (IFigure)i.next();
Dimension childSize = child.getPreferredSize();
d.height += childSize.height;
d.width = Math.max(childSize.width, d.width);
}
int childrenSize = children.size();
if (childrenSize > 0)
{
d.height += spacing * children.size() - 1;
}
return d;
}
/*
* Returns the minimum size required by the input container.
* This is the size of the largest child of the container, as all
* other children fit into this size.
*/
public Dimension getMinimumSize(IFigure figure, int wHint, int hHint){
Dimension d = new Dimension();
List children = figure.getChildren();
IFigure child;
for (int i=0; i < children.size(); i++){
child = (IFigure)children.get(i);
d.union(child.getMinimumSize());
}
d.expand(figure.getInsets().getWidth(),
figure.getInsets().getHeight());
return d;
}
public Dimension getPreferredSize(IFigure figure, int wHint, int hHint){
return calculatePreferredSize(figure, wHint, hHint);
}
/*
* Lays out the children on top of each other with
* their sizes equal to that of the available
* paintable area of the input container figure.
*/
public void layout(IFigure figure){
Rectangle r = figure.getClientArea();
List children = figure.getChildren();
Dimension preferredClientAreaSize = calculatePreferredClientAreaSize(figure);
int x = r.x + (r.width - preferredClientAreaSize.width) / 2;
int y = r.y + (r.height - preferredClientAreaSize.height) / 2;
for (Iterator i = children.iterator(); i.hasNext(); )
{
IFigure child = (IFigure)i.next();
Dimension childSize = child.getPreferredSize();
child.setBounds(new Rectangle(x, y, childSize.width, childSize.height));
y += childSize.height + spacing;
}
}
}
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