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/*******************************************************************************
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* Copyright (c) 2004, 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.gef.editparts;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import org.eclipse.draw2d.FreeformLayer;
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import org.eclipse.draw2d.IFigure;
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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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* This is a layer where the guide lines are displayed. The figures in this
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* layer should have a Boolean constraint indicating whether or not they are
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* horizontal guide lines.
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*
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* @author Pratik Shah
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* @since 3.0
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*/
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public class GuideLayer extends FreeformLayer {
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private Map constraints;
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/**
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* @param child
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* the figure whose constraint is to be found
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* @return the constraint (Boolean indicating whether or not it is
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* horizontal) set for the given IFigure; <code>null</code>, if none
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* exists
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*/
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public Object getConstraint(IFigure child) {
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return getConstraints().get(child);
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}
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/**
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* @return the Map of IFigures to their constraints (Booleans indicating
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* whether or not they are horizontal guide lines)
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*/
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public Map getConstraints() {
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if (constraints == null) {
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constraints = new HashMap();
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}
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return constraints;
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}
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/**
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* @see org.eclipse.draw2d.FreeformFigure#getFreeformExtent()
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*/
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public Rectangle getFreeformExtent() {
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/*
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* The freeform extents are just big enough to include all the children:
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* tall enough to include the highest and the lowest horizontal guide
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* lines, and wide enough to include the leftmost and the rightmost
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* vertical guide lines. They always include the point 5,5 and are
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* further expanded by 5-pixels in all directions so that none of the
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* guide lines are on the edge.
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*/
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/*
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* These ints are initialized to 5, and not 0, so that when the final
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* extent is expanded by 5, the bounds do not go into the negative
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* (unless necessary).
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*/
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int maxX = 5, minX = 5, maxY = 5, minY = 5;
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Iterator children = getChildren().iterator();
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while (children.hasNext()) {
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IFigure child = (IFigure) children.next();
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Boolean isHorizontal = (Boolean) getConstraint(child);
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if (isHorizontal != null) {
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if (isHorizontal.booleanValue()) {
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int position = child.getBounds().y;
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minY = Math.min(minY, position);
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maxY = Math.max(maxY, position);
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} else {
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int position = child.getBounds().x;
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minX = Math.min(minX, position);
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maxX = Math.max(maxX, position);
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}
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}
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}
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Rectangle r = new Rectangle(minX, minY, maxX - minX + 1, maxY - minY
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+ 1);
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if (r.width > 1)
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r.expand(5, 0);
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if (r.height > 1)
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r.expand(0, 5);
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return r;
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}
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/**
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* @see org.eclipse.draw2d.IFigure#getPreferredSize(int, int)
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*/
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public Dimension getPreferredSize(int wHint, int hHint) {
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Rectangle extents = getFreeformExtent();
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return new Dimension(extents.right(), extents.bottom());
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}
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/**
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* @see org.eclipse.draw2d.IFigure#remove(org.eclipse.draw2d.IFigure)
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*/
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public void remove(IFigure child) {
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getConstraints().remove(child);
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super.remove(child);
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}
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/**
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* @see org.eclipse.draw2d.IFigure#setBounds(org.eclipse.draw2d.geometry.Rectangle)
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*/
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public void setBounds(Rectangle rect) {
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super.setBounds(rect);
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Iterator children = getChildren().iterator();
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while (children.hasNext()) {
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IFigure child = (IFigure) children.next();
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Boolean isHorizontal = (Boolean) getConstraint(child);
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if (isHorizontal != null) {
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if (isHorizontal.booleanValue()) {
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Rectangle.SINGLETON.setLocation(getBounds().x,
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child.getBounds().y);
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Rectangle.SINGLETON.setSize(getBounds().width, 1);
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} else {
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Rectangle.SINGLETON.setLocation(child.getBounds().x,
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getBounds().y);
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Rectangle.SINGLETON.setSize(1, getBounds().height);
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}
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child.setBounds(Rectangle.SINGLETON);
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}
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}
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}
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/**
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* The constraint is expected to be a Boolean indicating whether the given
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* guide line figure is horizontal or not.
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*
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* @see org.eclipse.draw2d.IFigure#setConstraint(org.eclipse.draw2d.IFigure,
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* java.lang.Object)
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*/
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public void setConstraint(IFigure child, Object constraint) {
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getConstraints().put(child, constraint);
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}
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}
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