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annotate dwtx/draw2d/ConnectionRouter.d @ 101:1082a0fc2bb8

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First Draw2D example running
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 02:17:46 +0200
parents 95307ad235d9
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.ConnectionRouter;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Point;
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18 import dwtx.draw2d.geometry.PointList;
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19 import dwtx.draw2d.AnchorListener;
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20 import dwtx.draw2d.AbstractRouter;
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21 import dwtx.draw2d.Connection;
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22
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23 /**
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24 * Routes a {@link Connection}, possibly using a constraint.
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25 */
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26 public interface ConnectionRouter {
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27
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28 /**
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29 * Returns the constraint for the Connection.
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30 * @param connection The connection
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31 * @return The constraint
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32 */
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33 Object getConstraint(Connection connection);
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34
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35 /**
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36 * Invalidates the given Connection.
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37 * @param connection The connection to be invalidated
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38 */
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39 void invalidate(Connection connection);
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40
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41 /**
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42 * Routes the Connection.
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43 * @param connection The Connection to route
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44 */
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45 void route(Connection connection);
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46
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47 /**
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48 * Removes the Connection from this router.
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49 * @param connection The Connection to remove
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50 */
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51 void remove(Connection connection);
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52
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53 /**
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54 * Maps the given constraint to the given Connection.
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55 * @param connection The Connection
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56 * @param constraint The constraint
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57 */
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58 void setConstraint(Connection connection, Object constraint);
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59
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60
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61 }
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62 /**
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63 * Routes Connections directly from the source anchor to the target anchor with no
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64 * bendpoints in between.
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65 */
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66 class NullConnectionRouter
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67 : AbstractRouter
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68 {
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69
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70 /**
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71 * Constructs a new NullConnectionRouter.
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72 */
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73 this() { }
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74
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75 /**
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76 * Routes the given Connection directly between the source and target anchors.
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77 * @param conn the connection to be routed
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78 */
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79 public void route(Connection conn) {
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80 PointList points = conn.getPoints();
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81 points.removeAllPoints();
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82 Point p;
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83 conn.translateToRelative(p = getStartPoint(conn));
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84 points.addPoint(p);
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85 conn.translateToRelative(p = getEndPoint(conn));
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86 points.addPoint(p);
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87 conn.setPoints(points);
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88 }
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89 }
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90
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91
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92 /**
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93 * The default router for Connections.
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94 */
101
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95 private static NullConnectionRouter ConnectionRouter_NULL_;
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96 public static NullConnectionRouter ConnectionRouter_NULL(){
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97 if( ConnectionRouter_NULL_ is null ){
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98 synchronized( NullConnectionRouter.classinfo ){
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99 if( ConnectionRouter_NULL_ is null ){
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100 ConnectionRouter_NULL_ = new NullConnectionRouter();
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101 }
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102 }
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103 }
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104 return ConnectionRouter_NULL_;
98
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105 }
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107