/*******************************************************************************
* Copyright (c) 2001, 2007 Oracle 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.editpolicies;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.Locator;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
/**
* @author cbateman
*
*/
public class AbsolutePointLocator implements Locator
{
private static AbsolutePointLocator INSTANCE;
private final static Point DEFAULT_POINT = new Point(0,0);
private Point _referencePoint = DEFAULT_POINT;
private int _xOffset = 0;
private int _yOffset = 0;
private IFigure _intersectFigure;
/**
* @return the singleton instance
*/
public synchronized static AbsolutePointLocator getInstance()
{
if (INSTANCE == null)
{
INSTANCE = new AbsolutePointLocator();
}
return INSTANCE;
}
/**
* Relocates the target figure to the reference point with possible x and y
* offsetting. Uses the target's preferredSize as the new size.
*/
public void relocate(IFigure target)
{
Point leftTop = new Point(_referencePoint.x+_xOffset, _referencePoint.y+_yOffset);
//figure.translateToAbsolute(leftTop);
target.translateToRelative(leftTop);
Dimension d = target.getPreferredSize();
Rectangle rect = new Rectangle(leftTop, d);
// to avoid enlargemeent
if (_intersectFigure != null)
{
rect = rect.intersect(_intersectFigure.getBounds());
}
target.setBounds(rect);
}
/**
* Sets the reference point used to calculate the location to which
* relocate will relocate its target. The x and y offset values are added
* to the reference point before final re-location. If point is null
* then the reference is set to (0,0)
* @param point
* @param xoffset
* @param yoffset
*/
public void setReferencePoint(Point point, int xoffset, int yoffset)
{
if (point == null)
{
_referencePoint = DEFAULT_POINT;
}
else
{
_referencePoint = point;
}
_xOffset = xoffset;
_yOffset = yoffset;
}
/**
* Sets the figure used to calculate a rectangular intersect of the
* relocated target. This normally set to the parent of the target
* such as a layer to ensure that the relocate target does not enlarge
* its parent by relocating outside it's rectangle.
*
* If intersectFigure is set to null, then no intersect calculation will
* be performed.
*
* @param intersectFigure
*/
public void setIntersectFigure(IFigure intersectFigure)
{
_intersectFigure = intersectFigure;
}
private AbsolutePointLocator() {/*no external instantiation*/}
}