1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.g2d.element.handler;
14 import org.simantics.g2d.canvas.ICanvasContext;
15 import org.simantics.g2d.element.IElement;
16 import org.simantics.g2d.element.handler.impl.AbstractClickable;
17 import org.simantics.g2d.element.handler.impl.ClickableImpl;
18 import org.simantics.utils.threads.IThreadWorkQueue;
24 * @See {@link ClickableImpl}
25 * @See {@link AbstractClickable}
26 * @author Toni Kalajainen
28 public interface Clickable extends ElementHandler {
30 public static final ClickableImpl INSTANCE = ClickableImpl.INSTANCE;
32 // TODO PressStatus should be a variable of the viewport, not the diagram
33 public static enum PressStatus {
34 NORMAL, // not pressed
35 HOVER, // not pressed but mouse is hovering over the element
36 HELD, // pressed but mouse is not hovering over the element
37 PRESSED // pressed and mouse is hovering over the element
40 public interface ClickListener {
41 void onClick(IElement e, ICanvasContext ctx);
44 PressStatus getPressStatus(IElement e, ICanvasContext ctx);
46 // IMPL Note! Invocation must be thread safe (canvas thread is not guaranteed)
47 void addListener(IElement e, ICanvasContext ctx, IThreadWorkQueue thread, ClickListener listener);
49 // IMPL Note! Invocation must be thread safe (canvas thread is not guaranteed)
50 void removeListener(IElement e, ICanvasContext ctx, IThreadWorkQueue thread, ClickListener listener);