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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.gef.editpolicies;
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import org.eclipse.draw2d.Connection;
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import org.eclipse.draw2d.ConnectionAnchor;
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import org.eclipse.draw2d.XYAnchor;
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import org.eclipse.draw2d.geometry.Point;
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/**
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* Helps display connection feedback during drags of the connection ends. This
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* class is used internally by the provided EditPolicy implementation.
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*
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* @author hudsonr
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*/
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public class FeedbackHelper {
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private Connection connection;
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private XYAnchor dummyAnchor;
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private boolean isMovingStartAnchor = false;
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/**
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* Constructs a new FeedbackHelper.
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*/
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public FeedbackHelper() {
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dummyAnchor = new XYAnchor(new Point(10, 10));
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}
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/**
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* Returns the connection being used to show feedback.
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*
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* @return the connection
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*/
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protected Connection getConnection() {
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return connection;
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}
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/**
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* Returns true is the feedback is moving the source anchor
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*
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* @return <code>true</code> if moving start
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*/
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protected boolean isMovingStartAnchor() {
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return isMovingStartAnchor;
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}
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/**
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* Sets the connection.
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*
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* @param c
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* connection
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*/
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public void setConnection(Connection c) {
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connection = c;
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}
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/**
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* Sets if moving start of connection.
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*
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* @param value
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* <code>true</code> if the starts is being moved
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*/
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public void setMovingStartAnchor(boolean value) {
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isMovingStartAnchor = value;
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}
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/**
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* Sets the anchor for the end being moved.
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*
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* @param anchor
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* the new anchor
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*/
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protected void setAnchor(ConnectionAnchor anchor) {
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if (isMovingStartAnchor())
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getConnection().setSourceAnchor(anchor);
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else
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getConnection().setTargetAnchor(anchor);
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}
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/**
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* Updates the feedback based on the given anchor or point. The anchor is
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* used unless <code>null</code>. The point is used when there is no anchor.
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*
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* @param anchor
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* <code>null</code> or an anchor
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* @param p
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* the point to use when there is no anchor
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*/
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public void update(ConnectionAnchor anchor, Point p) {
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if (anchor != null)
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setAnchor(anchor);
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else {
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dummyAnchor.setLocation(p);
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setAnchor(dummyAnchor);
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}
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}
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}
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