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Java > Open Source Codes > org > nightlabs > editor2d > handle > AbstractLocator


1 /* *****************************************************************************
2  * NightLabs Editor2D - Graphical editor framework *
3  * Copyright (C) 2004-2005 NightLabs - http://NightLabs.org *
4  * Project author: Daniel Mazurek <Daniel.Mazurek [at] nightlabs [dot] org> *
5  * *
6  * This library is free software; you can redistribute it and/or *
7  * modify it under the terms of the GNU Lesser General Public *
8  * License as published by the Free Software Foundation; either *
9  * version 2.1 of the License, or (at your option) any later version. *
10  * *
11  * This library is distributed in the hope that it will be useful, *
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
14  * Lesser General Public License for more details. *
15  * *
16  * You should have received a copy of the GNU Lesser General Public *
17  * License along with this library; if not, write to the *
18  * Free Software Foundation, Inc., *
19  * 51 Franklin St, Fifth Floor, *
20  * Boston, MA 02110-1301 USA *
21  * *
22  * Or get it online : *
23  * http://www.gnu.org/copyleft/lesser.html *
24  * *
25  * *
26  ******************************************************************************/
27
28 package org.nightlabs.editor2d.handle;
29
30 import org.eclipse.draw2d.IFigure;
31 import org.eclipse.draw2d.Locator;
32 import org.eclipse.draw2d.geometry.Dimension;
33 import org.eclipse.draw2d.geometry.Point;
34 import org.eclipse.draw2d.geometry.Rectangle;
35 import org.eclipse.gef.GraphicalEditPart;
36
37
38 public abstract class AbstractLocator
39 implements Locator
40 {
41   protected GraphicalEditPart owner;
42   protected IFigure figure;
43   public AbstractLocator(GraphicalEditPart owner)
44   {
45     super();
46     this.owner = owner;
47     this.figure = owner.getFigure();
48   }
49
50   public void relocate(IFigure target)
51   {
52 // target.setLocation(calcCenterPoint(target.getBounds(), getLocation()));
53 target.setLocation(calcCenterPoint(target.getBounds(), getConstrainedPoint(target)));
54   }
55   
56   protected abstract Point getLocation();
57   
58   protected Point calcCenterPoint(Rectangle rect, Point point)
59   {
60     Dimension boundsSize = rect.getSize();
61     return new Point(point.x - boundsSize.width/2, point.y - boundsSize.height/2);
62   }
63   
64   protected Point getConstrainedPoint(IFigure target)
65   {
66     Point p = getLocation();
67     figure.translateToAbsolute(p);
68     target.translateToRelative(p);
69     return p;
70   }
71 }
72
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