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1
8 package com.nightlabs.editor2d.handle;
9
10 import java.util.List  ;
11
12 import org.eclipse.draw2d.IFigure;
13 import org.eclipse.draw2d.Locator;
14 import org.eclipse.draw2d.geometry.Dimension;
15 import org.eclipse.draw2d.geometry.Point;
16 import org.eclipse.draw2d.geometry.Rectangle;
17 import org.eclipse.gef.GraphicalEditPart;
18
19
20 public abstract class AbstractMultipleLocator
21 implements Locator
22 {
23 protected List editParts;
24 protected IFigure figure;
25 public AbstractMultipleLocator(List editParts)
26 {
27 super();
28 this.editParts = editParts;
29 this.figure = ((GraphicalEditPart)editParts.get(0)).getFigure();
30 }
31
32 public void relocate(IFigure target)
33 {
34 target.setLocation(calcCenterPoint(target.getBounds(), getConstrainedPoint(target)));
36 }
37
38 protected abstract Point getLocation();
39
40 protected Point calcCenterPoint(Rectangle rect, Point point)
41 {
42 Dimension boundsSize = rect.getSize();
43 return new Point(point.x - boundsSize.width/2, point.y - boundsSize.height/2);
44 }
45
46 protected Point getConstrainedPoint(IFigure target)
47 {
48 Point p = getLocation();
49 figure.translateToAbsolute(p);
50 target.translateToRelative(p);
51 return p;
52 }
53 }
54
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Java API By Example, From Geeks To Geeks.