| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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.draw2d; |
| |
| import org.eclipse.draw2d.geometry.Point; |
| |
| /** |
| * Provides support for anchors which depend on a figure for thier location. |
| * |
| * @author hudsonr |
| */ |
| public abstract class AbstractConnectionAnchor extends ConnectionAnchorBase |
| implements AncestorListener { |
| |
| private IFigure owner; |
| |
| /** |
| * Constructs an AbstractConnectionAnchor with no owner. |
| * |
| * @since 2.0 |
| */ |
| public AbstractConnectionAnchor() { |
| } |
| |
| /** |
| * Constructs an AbstractConnectionAnchor with the owner supplied as input. |
| * |
| * @since 2.0 |
| * @param owner |
| * Owner of this anchor |
| */ |
| public AbstractConnectionAnchor(IFigure owner) { |
| setOwner(owner); |
| } |
| |
| /** |
| * Adds the given listener to the listeners to be notified of anchor |
| * location changes. |
| * |
| * @since 2.0 |
| * @param listener |
| * Listener to be added |
| * @see #removeAnchorListener(AnchorListener) |
| */ |
| public void addAnchorListener(AnchorListener listener) { |
| if (listener == null) |
| return; |
| if (listeners.size() == 0) |
| getOwner().addAncestorListener(this); |
| super.addAnchorListener(listener); |
| } |
| |
| /** |
| * Notifies all the listeners of this anchor's location change. |
| * |
| * @since 2.0 |
| * @param figure |
| * Anchor-owning Figure which has moved |
| * @see org.eclipse.draw2d.AncestorListener#ancestorMoved(IFigure) |
| */ |
| public void ancestorMoved(IFigure figure) { |
| fireAnchorMoved(); |
| } |
| |
| /** |
| * @see org.eclipse.draw2d.AncestorListener#ancestorAdded(IFigure) |
| */ |
| public void ancestorAdded(IFigure ancestor) { |
| } |
| |
| /** |
| * @see org.eclipse.draw2d.AncestorListener#ancestorRemoved(IFigure) |
| */ |
| public void ancestorRemoved(IFigure ancestor) { |
| } |
| |
| /** |
| * Returns the owner Figure on which this anchor's location is dependent. |
| * |
| * @since 2.0 |
| * @return Owner of this anchor |
| * @see #setOwner(IFigure) |
| */ |
| public IFigure getOwner() { |
| return owner; |
| } |
| |
| /** |
| * Returns the point which is used as the reference by this |
| * AbstractConnectionAnchor. It is generally dependent on the Figure which |
| * is the owner of this AbstractConnectionAnchor. |
| * |
| * @since 2.0 |
| * @return The reference point of this anchor |
| * @see org.eclipse.draw2d.ConnectionAnchor#getReferencePoint() |
| */ |
| public Point getReferencePoint() { |
| if (getOwner() == null) |
| return null; |
| else { |
| Point ref = getOwner().getBounds().getCenter(); |
| getOwner().translateToAbsolute(ref); |
| return ref; |
| } |
| } |
| |
| /** |
| * Removes the given listener from this anchor. If all the listeners are |
| * removed, then this anchor removes itself from its owner. |
| * |
| * @since 2.0 |
| * @param listener |
| * Listener to be removed from this anchors listeners list |
| * @see #addAnchorListener(AnchorListener) |
| */ |
| public void removeAnchorListener(AnchorListener listener) { |
| super.removeAnchorListener(listener); |
| if (listeners.size() == 0) |
| getOwner().removeAncestorListener(this); |
| } |
| |
| /** |
| * Sets the owner of this anchor, on whom this anchors location is |
| * dependent. |
| * |
| * @since 2.0 |
| * @param owner |
| * Owner of this anchor |
| */ |
| public void setOwner(IFigure owner) { |
| this.owner = owner; |
| } |
| |
| } |