/*******************************************************************************
* Copyright (c) 2003, 2007 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.gef;
import org.eclipse.core.runtime.Assert;
import org.eclipse.draw2d.geometry.PrecisionRectangle;
/**
* Combines multiple SnapToHelpers into one compound helper. The compound helper
* deletages to multiple other helpers.
* @author Pratik Shah
*/
public class CompoundSnapToHelper
extends SnapToHelper
{
private SnapToHelper[] delegates;
/**
* Constructs a compound snap to helper which will delegate to the provided array of
* helpers. The first helper in the array has highest priority and will be given the
* first opportunity to perform snapping.
* @since 3.0
* @param delegates an array of helpers
*/
public CompoundSnapToHelper(SnapToHelper delegates[]) {
Assert.isTrue(delegates.length != 0);
this.delegates = delegates;
}
/**
* Gets the array of helpers.
*
* @return the array of helpers.
* @since 3.4
*/
protected SnapToHelper[] getDelegates() {
return delegates;
}
/**
* @see SnapToHelper#snapRectangle(Request, int, PrecisionRectangle, PrecisionRectangle)
*/
public int snapRectangle(Request request, int snapOrientation,
PrecisionRectangle baseRect, PrecisionRectangle result) {
for (int i = 0; i < getDelegates().length && snapOrientation != NONE; i++)
snapOrientation = getDelegates()[i].snapRectangle(request, snapOrientation,
baseRect, result);
return snapOrientation;
}
}