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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.Iterator;
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import java.util.ListIterator;
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import java.util.Map;
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import org.eclipse.draw2d.geometry.Dimension;
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import org.eclipse.draw2d.geometry.Insets;
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import org.eclipse.draw2d.geometry.Point;
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import org.eclipse.draw2d.geometry.Rectangle;
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/**
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* This class implements the {@link org.eclipse.draw2d.LayoutManager} interface
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* using the XY Layout algorithm. This lays out the components using the layout
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* constraints as defined by each component.
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*/
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public class XYLayout extends AbstractLayout {
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/** The layout contraints */
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protected Map constraints = new HashMap();
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/**
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* Calculates and returns the preferred size of the input figure. Since in
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* XYLayout the location of the child should be preserved, the preferred
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* size would be a region which would hold all the children of the input
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* figure. If no constraint is set, that child is ignored for calculation.
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* If width and height are not positive, the preferred dimensions of the
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* child are taken.
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*
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* @see AbstractLayout#calculatePreferredSize(IFigure, int, int)
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* @since 2.0
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*/
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protected Dimension calculatePreferredSize(IFigure f, int wHint, int hHint) {
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Rectangle rect = new Rectangle();
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ListIterator children = f.getChildren().listIterator();
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while (children.hasNext()) {
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IFigure child = (IFigure) children.next();
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Rectangle r = (Rectangle) constraints.get(child);
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if (r == null)
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continue;
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if (r.width == -1 || r.height == -1) {
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Dimension preferredSize = child.getPreferredSize(r.width,
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r.height);
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r = r.getCopy();
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if (r.width == -1)
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r.width = preferredSize.width;
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if (r.height == -1)
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r.height = preferredSize.height;
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}
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rect.union(r);
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}
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Dimension d = rect.getSize();
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Insets insets = f.getInsets();
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return new Dimension(d.width + insets.getWidth(), d.height
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+ insets.getHeight()).union(getBorderPreferredSize(f));
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}
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/**
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* @see LayoutManager#getConstraint(IFigure)
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*/
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public Object getConstraint(IFigure figure) {
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return constraints.get(figure);
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}
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/**
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* Returns the origin for the given figure.
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*
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* @param parent
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* the figure whose origin is requested
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* @return the origin
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*/
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public Point getOrigin(IFigure parent) {
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return parent.getClientArea().getLocation();
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}
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/**
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* Implements the algorithm to layout the components of the given container
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* figure. Each component is laid out using its own layout constraint
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* specifying its size and position.
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*
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* @see LayoutManager#layout(IFigure)
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*/
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public void layout(IFigure parent) {
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Iterator children = parent.getChildren().iterator();
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Point offset = getOrigin(parent);
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IFigure f;
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while (children.hasNext()) {
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f = (IFigure) children.next();
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Rectangle bounds = (Rectangle) getConstraint(f);
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if (bounds == null)
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continue;
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if (bounds.width == -1 || bounds.height == -1) {
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Dimension preferredSize = f.getPreferredSize(bounds.width,
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bounds.height);
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bounds = bounds.getCopy();
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if (bounds.width == -1)
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bounds.width = preferredSize.width;
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if (bounds.height == -1)
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bounds.height = preferredSize.height;
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}
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bounds = bounds.getTranslated(offset);
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f.setBounds(bounds);
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}
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}
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/**
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* @see LayoutManager#remove(IFigure)
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*/
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public void remove(IFigure figure) {
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super.remove(figure);
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constraints.remove(figure);
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}
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/**
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* Sets the layout constraint of the given figure. The constraints can only
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* be of type {@link Rectangle}.
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*
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* @see LayoutManager#setConstraint(IFigure, Object)
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* @since 2.0
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*/
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public void setConstraint(IFigure figure, Object newConstraint) {
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super.setConstraint(figure, newConstraint);
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if (newConstraint != null)
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constraints.put(figure, newConstraint);
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}
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}
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