bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/nodes/connection/RouteGraphNode.java

   1 /*******************************************************************************
   2  * Copyright (c) 2011 Association for Decentralized Information Management in
   3  * Industry THTH ry.
   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
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.scenegraph.g2d.nodes.connection;
  13
  14 import java.awt.BasicStroke;
  15 import java.awt.Color;
  16 import java.awt.Graphics2D;
  17 import java.awt.RenderingHints;
  18 import java.awt.Shape;
  19 import java.awt.Stroke;
  20 import java.awt.event.KeyEvent;
  21 import java.awt.geom.AffineTransform;
  22 import java.awt.geom.Path2D;
  23 import java.awt.geom.Point2D;
  24 import java.awt.geom.Rectangle2D;
  25 import java.lang.reflect.Constructor;
  26 import java.util.Collection;
  27 import java.util.Map;
  28
  29 import org.simantics.diagram.connection.RouteGraph;
  30 import org.simantics.diagram.connection.RouteLine;
  31 import org.simantics.diagram.connection.RouteLink;
  32 import org.simantics.diagram.connection.RouteTerminal;
  33 import org.simantics.diagram.connection.actions.IAction;
  34 import org.simantics.diagram.connection.actions.IReconnectAction;
  35 import org.simantics.diagram.connection.actions.MoveAction;
  36 import org.simantics.diagram.connection.actions.ReconnectLineAction;
  37 import org.simantics.diagram.connection.delta.RouteGraphDelta;
  38 import org.simantics.diagram.connection.rendering.BasicConnectionStyle;
  39 import org.simantics.diagram.connection.rendering.ConnectionStyle;
  40 import org.simantics.diagram.connection.rendering.IRouteGraphRenderer;
  41 import org.simantics.diagram.connection.rendering.StyledRouteGraphRenderer;
  42 import org.simantics.diagram.connection.rendering.arrows.ILineEndStyle;
  43 import org.simantics.diagram.connection.splitting.SplittedRouteGraph;
  44 import org.simantics.scenegraph.INode;
  45 import org.simantics.scenegraph.ISelectionPainterNode;
  46 import org.simantics.scenegraph.g2d.G2DNode;
  47 import org.simantics.scenegraph.g2d.G2DParentNode;
  48 import org.simantics.scenegraph.g2d.IG2DNode;
  49 import org.simantics.scenegraph.g2d.events.EventTypes;
  50 import org.simantics.scenegraph.g2d.events.KeyEvent.KeyPressedEvent;
  51 import org.simantics.scenegraph.g2d.events.KeyEvent.KeyReleasedEvent;
  52 import org.simantics.scenegraph.g2d.events.MouseEvent;
  53 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonPressedEvent;
  54 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonReleasedEvent;
  55 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseClickEvent;
  56 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseDragBegin;
  57 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseMovedEvent;
  58 import org.simantics.scenegraph.g2d.events.command.CommandEvent;
  59 import org.simantics.scenegraph.g2d.events.command.Commands;
  60 import org.simantics.scenegraph.g2d.nodes.GridNode;
  61 import org.simantics.scenegraph.g2d.nodes.LinkNode;
  62 import org.simantics.scenegraph.g2d.nodes.connection.HighlightActionPointsAction.Action;
  63 import org.simantics.scenegraph.g2d.nodes.connection.HighlightActionPointsAction.Pick;
  64 import org.simantics.scenegraph.g2d.snap.ISnapAdvisor;
  65 import org.simantics.scenegraph.utils.GeometryUtils;
  66 import org.simantics.scenegraph.utils.InitValueSupport;
  67 import org.simantics.scenegraph.utils.NodeUtil;
  68
  69 import gnu.trove.map.hash.THashMap;
  70
  71 /**
  72  * @author Tuukka Lehtonen
  73  */
  74 public class RouteGraphNode extends G2DNode implements ISelectionPainterNode, InitValueSupport  {
  75
  76     private static final long       serialVersionUID = -917194130412280965L;
  77
  78     private static final double     TOLERANCE        = IAction.TOLERANCE;
  79     private static final Stroke     SELECTION_STROKE = new BasicStroke(1f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);
  80     private static final Color      SELECTION_COLOR  = new Color(255, 0, 255, 96);
  81
  82     private static final HighlightActionPointsAction highlightActions = new HighlightActionPointsAction(null);
  83
  84     protected RouteGraph            rg;
  85     protected IRouteGraphRenderer   baseRenderer;
  86     protected IRouteGraphRenderer   renderer;
  87     protected double                pickTolerance    = TOLERANCE;
  88     protected boolean               editable         = true;
  89     private boolean                 branchable       = true;
  90
  91     protected IRouteGraphListener   rgListener;
  92     protected RouteGraphDelta       rgDelta;
  93
  94     protected transient double      mouseX;
  95     protected transient double      mouseY;
  96     protected transient Point2D     pt               = new Point2D.Double();
  97
  98     protected transient MoveAction  dragAction;
  99     protected transient IAction     currentAction;
 100     protected transient Rectangle2D bounds;
 101
 102     /**
 103      * Dynamic color for connection rendering.
 104      */
 105     protected transient Color       dynamicColor;
 106
 107     /**
 108      * Dynamic stroke for connection rendering.
 109      */
 110     protected transient Stroke      dynamicStroke;
 111
 112     protected transient Path2D      selectionPath    = new Path2D.Double();
 113     protected transient Stroke      selectionStroke  = null;
 114
 115     protected transient boolean     highlightActionsEnabled = false;
 116     protected transient AffineTransform lastViewTransform = null;
 117
 118     /**
 119      * x = NaN is used to indicate that possible branch point should not be
 120      * rendered but interaction has not ended yet.
 121      */
 122     protected transient Point2D     newBranchPointPosition = null;
 123
 124
 125     protected transient Map<Object,ILineEndStyle> dynamicStyles = null;
 126
 127     @Override
 128     public void initValues() {
 129         dynamicColor = null;
 130         wrapRenderer();
 131     }
 132
 133     @PropertySetter("color")
 134     @SyncField(value = {"dynamicColor"})
 135     public void setDynamicColor(Color color) {
 136         this.dynamicColor = color;
 137         wrapRenderer();
 138     }
 139
 140     @PropertySetter("width")
 141     @SyncField("dynamicStroke")
 142     public void setDynamicStroke(Stroke stroke) {
 143         this.dynamicStroke = stroke;
 144         wrapRenderer();
 145         createSelectionStroke();
 146     }
 147
 148     @SyncField(value = {"dynamicStyles"})
 149     public void setDynamicLineEnd(RouteTerminal terminal, ILineEndStyle style) {
 150         if (dynamicStyles == null)
 151                 dynamicStyles = new THashMap<Object, ILineEndStyle>();
 152         terminal.setDynamicStyle(style);
 153         if (terminal.getData() != null) {
 154                 if (style != null)
 155                         dynamicStyles.put(terminal.getData(),style);
 156                 else
 157                         dynamicStyles.remove(terminal.getData());
 158         }
 159     }
 160
 161     private void updateLineEnds() {
 162         if (dynamicStyles == null)
 163                 return;
 164         for (RouteTerminal t : rg.getTerminals()) {
 165                 if (t.getData() == null)
 166                         continue;
 167                 ILineEndStyle dynamicStyle = dynamicStyles.get(t.getData());
 168                 if (dynamicStyle != null)
 169                         t.setDynamicStyle(dynamicStyle);
 170         }
 171     }
 172
 173     @SyncField(value = {"rg"})
 174     public void setRouteGraph(RouteGraph graph) {
 175         this.rg = graph;
 176         updateLineEnds();
 177         updateBounds();
 178     }
 179
 180     @SyncField(value = {"rgDelta"})
 181     public void setRouteGraphDelta(RouteGraphDelta delta) {
 182         this.rgDelta = delta;
 183     }
 184
 185     @SyncField(value = {"renderer"})
 186     public void setRenderer(IRouteGraphRenderer renderer) {
 187
 188         this.baseRenderer = renderer;
 189         wrapRenderer();
 190
 191         createSelectionStroke();
 192     }
 193
 194     private void createSelectionStroke() {
 195          BasicConnectionStyle style = tryGetStyle();
 196          selectionStroke = null;
 197          if (style != null) {
 198              BasicStroke stroke = (BasicStroke) style.getLineStroke();
 199              if (stroke != null) {
 200                  float width = Math.max(stroke.getLineWidth() + 0.75f, stroke.getLineWidth()*1.3f);
 201                  selectionStroke = new BasicStroke(width, BasicStroke.CAP_BUTT, stroke.getLineJoin());
 202              }
 203          } else {
 204              selectionStroke = SELECTION_STROKE;
 205          }
 206     }
 207
 208     private void wrapRenderer() {
 209
 210         if(baseRenderer == null) {
 211             renderer = null;
 212             return;
 213         }
 214
 215         if(dynamicColor != null || dynamicStroke != null) {
 216             BasicConnectionStyle baseStyle = (BasicConnectionStyle)tryGetStyle(baseRenderer);
 217             try {
 218                 Constructor<? extends BasicConnectionStyle> c = baseStyle.getClass().getConstructor(Color.class, Color.class, double.class, Stroke.class, Stroke.class, double.class);
 219                 renderer = new StyledRouteGraphRenderer(c.newInstance(
 220                         dynamicColor != null ? dynamicColor : baseStyle.getLineColor(),
 221                                 baseStyle.getBranchPointColor(), baseStyle.getBranchPointRadius(),
 222                                     dynamicStroke != null ? dynamicStroke : baseStyle.getLineStroke(),
 223                                             dynamicStroke != null ? dynamicStroke : baseStyle.getRouteLineStroke(),
 224                                                     baseStyle.getDegeneratedLineLength()));
 225             } catch (Exception e) {
 226                 renderer = new StyledRouteGraphRenderer(new BasicConnectionStyle(
 227                         dynamicColor != null ? dynamicColor : baseStyle.getLineColor(),
 228                                 baseStyle.getBranchPointColor(), baseStyle.getBranchPointRadius(),
 229                                     dynamicStroke != null ? dynamicStroke : baseStyle.getLineStroke(),
 230                                             dynamicStroke != null ? dynamicStroke : baseStyle.getRouteLineStroke(),
 231                                                     baseStyle.getDegeneratedLineLength()));
 232             }
 233
 234
 235         } else {
 236             renderer = baseRenderer;
 237         }
 238
 239     }
 240
 241     @SyncField(value = {"pickTolerance"})
 242     public void setPickTolerance(double tolerance) {
 243         this.pickTolerance = tolerance;
 244     }
 245
 246     @SyncField(value = {"editable"})
 247     public void setEditable(boolean editable) {
 248         this.editable = editable;
 249     }
 250
 251     @SyncField(value = {"branchable"})
 252     public void setBranchable(boolean branchable) {
 253         this.branchable = branchable;
 254     }
 255
 256     public RouteGraph getRouteGraph() {
 257         return rg;
 258     }
 259
 260     public RouteGraphDelta getRouteGraphDelta() {
 261         return rgDelta;
 262     }
 263
 264     public IRouteGraphRenderer getRenderer() {
 265         return renderer;
 266     }
 267
 268     public boolean isEditable() {
 269         return editable;
 270     }
 271
 272     public boolean isBranchable() {
 273         return branchable;
 274     }
 275
 276     public double getPickTolerance() {
 277                 return pickTolerance;
 278         }
 279
 280     /**
 281      * When in client-server mode, listener is only set on the server side and
 282      * fireRouteGraphChanged will tell it when rg has changed.
 283      *
 284      * @param listener
 285      */
 286     public void setRouteGraphListener(IRouteGraphListener listener) {
 287         this.rgListener = listener;
 288     }
 289
 290     /**
 291      * @param before
 292      * @param after
 293      * @return <code>true</code> if changes were fired
 294      */
 295     private boolean setRouteGraphAndFireChanges(RouteGraph before, RouteGraph after) {
 296         RouteGraphDelta delta = new RouteGraphDelta(before, after);
 297         if (!delta.isEmpty()) {
 298             setRouteGraph(after);
 299             setRouteGraphDelta(delta);
 300             fireRouteGraphChanged(before, after, delta);
 301             return true;
 302         }
 303         return false;
 304     }
 305
 306     @ServerSide
 307     protected void fireRouteGraphChanged(RouteGraph before, RouteGraph after, RouteGraphDelta delta) {
 308         if (rgListener != null) {
 309             RouteGraphChangeEvent event = new RouteGraphChangeEvent(this, before, after, delta);
 310             rgListener.routeGraphChanged(event);
 311         }
 312     }
 313
 314     public void showBranchPoint(Point2D p) {
 315         newBranchPointPosition = p;
 316     }
 317
 318     @Override
 319     public void init() {
 320         super.init();
 321         addEventHandler(this);
 322     }
 323
 324     @Override
 325     public void cleanup() {
 326         rgListener = null;
 327         removeEventHandler(this);
 328         super.cleanup();
 329     }
 330
 331     protected boolean isSelected() {
 332         return NodeUtil.isSelected(this, 1);
 333     }
 334
 335     @Override
 336     public void render(Graphics2D g) {
 337         if (renderer == null)
 338             return;
 339
 340         AffineTransform ot = null;
 341         AffineTransform t = getTransform();
 342         if (t != null && !t.isIdentity()) {
 343             ot = g.getTransform();
 344             g.transform(getTransform());
 345         }
 346
 347         Object aaHint = g.getRenderingHint(RenderingHints.KEY_ANTIALIASING);
 348         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
 349
 350         boolean selected = NodeUtil.isSelected(this, 1);
 351
 352         if (currentAction != null) {
 353             currentAction.render(g, renderer, mouseX, mouseY);
 354         } else {
 355             if (selected && selectionStroke != null) {
 356                 selectionPath.reset();
 357                 rg.getPath2D(selectionPath);
 358                 Shape selectionShape = selectionStroke.createStrokedShape(selectionPath);
 359                 g.setColor(SELECTION_COLOR);
 360                 g.fill(selectionShape);
 361             }
 362
 363             renderer.render(g, rg);
 364             if(selected)
 365                 renderer.renderGuides(g, rg);
 366
 367             if (selected && highlightActionsEnabled) {
 368                 // Needed for performing actions in #mouseClicked
 369                 this.lastViewTransform = g.getTransform();
 370                 highlightActions.setRouteGraph(rg);
 371                 highlightActions.render(g, renderer, mouseX, mouseY);
 372                 highlightActions.setRouteGraph(null);
 373             }
 374         }
 375
 376         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, aaHint);
 377
 378         if (editable && branchable && newBranchPointPosition != null && !Double.isNaN(newBranchPointPosition.getX())) {
 379             ConnectionStyle style = tryGetStyle();
 380             if(style != null)
 381                 style.drawBranchPoint(g, newBranchPointPosition.getX(), newBranchPointPosition.getY());
 382         }
 383
 384         if (ot != null)
 385             g.setTransform(ot);
 386     }
 387
 388     private BasicConnectionStyle tryGetStyle() {
 389         return tryGetStyle(renderer);
 390     }
 391
 392     private BasicConnectionStyle tryGetStyle(IRouteGraphRenderer renderer) {
 393         if (renderer instanceof StyledRouteGraphRenderer) {
 394             ConnectionStyle cs = ((StyledRouteGraphRenderer) renderer).getStyle();
 395             if (cs instanceof BasicConnectionStyle)
 396                 return (BasicConnectionStyle) cs;
 397         }
 398         return null;
 399     }
 400
 401     private double getSelectionStrokeWidth() {
 402         if (selectionStroke instanceof BasicStroke) {
 403             BasicStroke bs = (BasicStroke) selectionStroke;
 404             return bs.getLineWidth();
 405         }
 406         return 1.0;
 407     }
 408
 409     @Override
 410     public Rectangle2D getBoundsInLocal() {
 411         return bounds;
 412     }
 413
 414     protected void updateBounds() {
 415         Rectangle2D r = this.bounds;
 416         if (r == null)
 417             r = new Rectangle2D.Double();
 418         this.bounds = calculateBounds(r);
 419
 420         // Need to expand to take stroke width into account.
 421         double sw = getSelectionStrokeWidth() / 2;
 422         GeometryUtils.expandRectangle(this.bounds, sw, sw);
 423     }
 424
 425     protected Rectangle2D calculateBounds(Rectangle2D rect) {
 426         RouteGraph rg = this.rg;
 427         if (currentAction instanceof MoveAction)
 428             rg = ((MoveAction) currentAction).getRouteGraph();
 429         rg.getBounds(rect);
 430         return rect;
 431     }
 432
 433     protected void getMouseLocalPos(MouseEvent e) {
 434         //System.out.println("m: " + e.controlPosition);
 435         pt.setLocation(e.controlPosition);
 436         //System.out.println("parent: " + pt);
 437         pt = NodeUtil.worldToLocal(this, pt, pt);
 438         //System.out.println("local: " + pt);
 439         mouseX = pt.getX();
 440         mouseY = pt.getY();
 441     }
 442
 443     @Override
 444     protected boolean mouseDragged(MouseDragBegin e) {
 445         if (dragAction != null && !e.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK) && e.button == MouseEvent.LEFT_BUTTON) {
 446             currentAction = dragAction;
 447             dragAction = null;
 448         }
 449         return updateCurrentAction(e, true);
 450     }
 451
 452     @Override
 453     protected boolean mouseMoved(MouseMovedEvent e) {
 454         //System.out.println("mouse moved: " + e);
 455
 456         // Handle connection branching visualization.
 457         getMouseLocalPos(e);
 458         if (newBranchPointPosition == null && e.hasAnyModifier(MouseEvent.ALT_MASK | MouseEvent.ALT_GRAPH_MASK)) {
 459             if (bounds.contains(mouseX, mouseY)) {
 460                 newBranchPointPosition = new Point2D.Double(Double.NaN, Double.NaN);
 461             }
 462         }
 463         if (newBranchPointPosition != null) {
 464             RouteLine line = rg.pickLine(mouseX, mouseY, pickTolerance);
 465             if (line != null) {
 466                 newBranchPointPosition.setLocation(mouseX, mouseY);
 467                 SplittedRouteGraph.snapToLine(newBranchPointPosition, line);
 468                 repaint();
 469             } else if (!Double.isNaN(newBranchPointPosition.getX())) {
 470                 newBranchPointPosition.setLocation(Double.NaN, Double.NaN);
 471                 repaint();
 472             }
 473         }
 474
 475         // Make sure that highlight action rendering is according to mouse hover.
 476         if (highlightActionsEnabled) {
 477             if (NodeUtil.isSelected(this, 1)) {
 478                 repaint();
 479             }
 480         }
 481
 482         return updateCurrentAction(e, false);
 483     }
 484
 485     protected boolean updateCurrentAction(MouseEvent e, boolean updateMousePos) {
 486         boolean oldHighlight = highlightActionsEnabled;
 487         highlightActionsEnabled = e.hasAllModifiers(MouseEvent.CTRL_MASK);
 488         if (oldHighlight != highlightActionsEnabled)
 489             repaint();
 490
 491         if (currentAction != null) {
 492             if (updateMousePos)
 493                 getMouseLocalPos(e);
 494             updateBounds();
 495
 496             // Repaint, but only if absolutely necessary.
 497             if (currentAction instanceof MoveAction || bounds.contains(mouseX, mouseY))
 498                 repaint();
 499
 500             return true;
 501         }
 502         return false;
 503     }
 504
 505     @Override
 506     protected boolean mouseClicked(MouseClickEvent e) {
 507         if (!editable)
 508             return false;
 509
 510         if (e.button == MouseEvent.LEFT_BUTTON) {
 511             if (isSelected() && highlightActionsEnabled) {
 512                 // Reconnection / segment deletion only available for branched connections.
 513                 if (rg.getTerminals().size() > 2) {
 514                     Pick pick = highlightActions.pickAction(rg, lastViewTransform, mouseX, mouseY);
 515                     if (pick.hasAction(Action.REMOVE)) {
 516                         RemoveLineAction remove = RemoveLineAction.perform(rg, pick.line.getLine(), mouseX, mouseY);
 517                         if (remove != null) {
 518                             setRouteGraphAndFireChanges(remove.getOriginalRouteGraph(), remove.getRouteGraph());
 519                             repaint();
 520                             return true;
 521                         }
 522                     }
 523                     if (pick.hasAction(Action.RECONNECT)) {
 524                         currentAction = ReconnectLineAction.create(rg, mouseX, mouseY);
 525                         if (currentAction != null) {
 526                             repaint();
 527                         }
 528                     }
 529                 }
 530             }
 531         }
 532
 533         return false;
 534     }
 535
 536     @Override
 537     protected boolean mouseButtonPressed(MouseButtonPressedEvent e) {
 538         if (!editable)
 539             return false;
 540
 541         if (e.button == MouseEvent.LEFT_BUTTON) {
 542             // Visualize new branch point no longer.
 543             newBranchPointPosition = null;
 544
 545             getMouseLocalPos(e);
 546             dragAction = null;
 547 //          if(currentAction instanceof HighlightActionPointsAction) {
 548 //              RemoveLineAction remove = RemoveLineAction.perform(rg, mouseX, mouseY);
 549 //              if (remove != null) {
 550 //                  setRouteGraphAndFireChanges(remove.getOriginalRouteGraph(), remove.getRouteGraph());
 551 //                  repaint();
 552 //              } else {
 553 //                  currentAction = ReconnectLineAction.create(rg, mouseX, mouseY);
 554 //                  if (currentAction != null)
 555 //                      repaint();
 556 //              }
 557 //          }
 558 //          else
 559             if(currentAction instanceof IReconnectAction) {
 560                 RouteGraph originalRg = rg.copy();
 561                 ((IReconnectAction)currentAction).finish(mouseX, mouseY);
 562                 currentAction = null;
 563
 564                 setRouteGraphAndFireChanges(originalRg, rg);
 565
 566                 currentAction = null;
 567                 repaint();
 568                 return true;
 569             }
 570             else {
 571                 if (!allowConnectionRerouting()) {
 572                     return false;
 573                 }
 574                 //System.out.println("move action");
 575                 dragAction = SnappingMoveAction.create(rg, mouseX, mouseY, pickTolerance, moveFilter, getSnapAdvisor());
 576                 //System.out.println("DRAG ACTION: " + dragAction);
 577             }
 578
 579             //System.out.println(this + " NEW action: " + currentAction);
 580             if (currentAction != null)
 581                 return true;
 582         }
 583         return false;
 584     }
 585
 586     /**
 587      * Checks the selections data node in the scene graph for any links
 588      * @return
 589      */
 590     private boolean allowConnectionRerouting() {
 591         final int maxOtherNodesSelected = 1;
 592
 593         INode selections = NodeUtil.tryLookup(this, "selections");
 594         if (!(selections instanceof G2DParentNode))
 595             return true;
 596         G2DParentNode p = (G2DParentNode) selections;
 597         for (IG2DNode selection : p.getNodes()) {
 598             if (!(selection instanceof G2DParentNode))
 599                 continue;
 600
 601             G2DParentNode sp = (G2DParentNode) selection;
 602             Collection<IG2DNode> links = sp.getNodes();
 603             if (links.isEmpty())
 604                 return true;
 605             int othersSelected = 0;
 606             for (IG2DNode link : links) {
 607                 if (link instanceof LinkNode) {
 608                     INode node = ((LinkNode) link).getDelegate();
 609                     if (!NodeUtil.isParentOf(node, this)) {
 610                         othersSelected++;
 611                         if (othersSelected > maxOtherNodesSelected)
 612                             return false;
 613                     }
 614                 }
 615             }
 616             if (othersSelected > maxOtherNodesSelected)
 617                 return false;
 618         }
 619         return true;
 620     }
 621
 622     protected ISnapAdvisor getSnapAdvisor() {
 623         GridNode grid = lookupNode(GridNode.GRID_NODE_ID, GridNode.class);
 624         return grid != null ? grid.getSnapAdvisor() : null;
 625     }
 626
 627     MoveAction.TargetFilter moveFilter = new MoveAction.TargetFilter() {
 628         @Override
 629         public boolean accept(Object target) {
 630             return (target instanceof RouteLine) || (target instanceof RouteLink);
 631         }
 632     };
 633
 634     @Override
 635     protected boolean handleCommand(CommandEvent e) {
 636         /*if (Commands.DELETE.equals(e.command)) {
 637             Object target = rg.pick(mouseX, mouseY, pickTolerance);
 638             return deleteTarget(target);
 639         } else if (Commands.SPLIT_CONNECTION.equals(e.command)) {
 640             Object target = rg.pick(mouseX, mouseY, pickTolerance);
 641             return splitTarget(target);
 642         } else */
 643         if (Commands.CANCEL.equals(e.command)) {
 644             return cancelCurrentAction();
 645         }
 646         return false;
 647     }
 648
 649     protected boolean mouseButtonReleased(MouseButtonReleasedEvent e) {
 650         if (currentAction instanceof MoveAction) {
 651             MoveAction move = (MoveAction) currentAction;
 652             RouteGraph originalRg = rg.copy();
 653             move.finish(mouseX, mouseY);
 654
 655             setRouteGraphAndFireChanges(originalRg, rg);
 656
 657             currentAction = null;
 658             repaint();
 659             return true;
 660         }
 661         return false;
 662     }
 663
 664     @Override
 665     protected boolean keyPressed(KeyPressedEvent e) {
 666         if (!editable)
 667             return false;
 668
 669         if (!e.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK) && e.keyCode == KeyEvent.VK_S) {
 670             Object target = rg.pick(mouseX, mouseY, pickTolerance, RouteGraph.PICK_PERSISTENT_LINES | RouteGraph.PICK_TRANSIENT_LINES);
 671             return splitTarget(target);
 672         }
 673         else if (!e.hasAnyModifier(MouseEvent.ALT_MASK | MouseEvent.ALT_GRAPH_MASK | MouseEvent.CTRL_MASK) && (e.keyCode == KeyEvent.VK_R || e.keyCode == KeyEvent.VK_D)) {
 674             Object target = rg.pick(mouseX, mouseY, pickTolerance, RouteGraph.PICK_PERSISTENT_LINES);
 675             return deleteTarget(target);
 676         }
 677         else if (e.keyCode == KeyEvent.VK_ESCAPE) {
 678             return cancelCurrentAction();
 679         }
 680 //        else if (e.keyCode == KeyEvent.VK_D) {
 681 //            if (target instanceof RouteTerminal) {
 682 //                RouteTerminal terminal = (RouteTerminal) target;
 683 //                RouteGraph before = rg.copy();
 684 //                rg.toggleDirectLines(terminal);
 685 //                setRouteGraphAndFireChanges(before, rg);
 686 //                repaint();
 687 //            }
 688 //        }
 689 //        else if (target != null && e.getKeyCode() == KeyEvent.VK_P) {
 690 //            rg.print();
 691 //        }
 692         else if (e.keyCode == KeyEvent.VK_CONTROL) {
 693             highlightActionsEnabled = true;
 694             repaint();
 695         }
 696         else if (e.keyCode == KeyEvent.VK_ALT) {
 697             // Begin connection branching visualization.
 698             RouteLine line = rg.pickLine(mouseX, mouseY, pickTolerance);
 699             if (branchable && line != null) {
 700                 newBranchPointPosition = new Point2D.Double(mouseX, mouseY);
 701                 SplittedRouteGraph.snapToLine(newBranchPointPosition, line);
 702                 repaint();
 703             }
 704         }
 705
 706         return false;
 707     }
 708
 709     @Override
 710     protected boolean keyReleased(KeyReleasedEvent e) {
 711         if (e.keyCode == KeyEvent.VK_ALT) {
 712             // End connection branching visualization.
 713             if (newBranchPointPosition != null) {
 714                 newBranchPointPosition = null;
 715                 repaint();
 716             }
 717         }
 718         if (e.keyCode == KeyEvent.VK_CONTROL) {
 719             highlightActionsEnabled = false;
 720             repaint();
 721         }
 722         return false;
 723     }
 724
 725
 726     private boolean cancelCurrentAction() {
 727         if (currentAction != null) {
 728             currentAction = null;
 729             repaint();
 730             return true;
 731         }
 732         return false;
 733     }
 734
 735     private boolean splitTarget(Object target) {
 736         if (target instanceof RouteLine) {
 737             RouteLine rLine = (RouteLine)target;
 738             RouteGraph before = rg.copy();
 739             rg.split(rLine, rLine.isHorizontal() ? mouseX : mouseY);
 740             setRouteGraphAndFireChanges(before, rg);
 741             repaint();
 742             return true;
 743         }
 744         return false;
 745     }
 746
 747     private boolean deleteTarget(Object target) {
 748         boolean changed = false;
 749         if (target instanceof RouteLine) {
 750             RouteLine line = (RouteLine) target;
 751             RouteGraph before = rg.copy();
 752             rg.merge(line);
 753             changed = setRouteGraphAndFireChanges(before, rg);
 754         }
 755         else if (target instanceof RouteLink) {
 756             RouteGraph before = rg.copy();
 757             rg.deleteCorner((RouteLink) target);
 758             changed = setRouteGraphAndFireChanges(before, rg);
 759         }
 760 //        else if (target instanceof RouteTerminal) {
 761 //            RouteGraph before = rg.copy();
 762 //            rg.remove((RouteTerminal) target);
 763 //            changed = setRouteGraphAndFireChanges(before, rg);
 764 //        }
 765         if (changed)
 766             repaint();
 767         return changed;
 768     }
 769
 770     /**
 771      * A version of MoveAction that snaps movements using the specified
 772      * ISnapAdvisor.
 773      */
 774     static class SnappingMoveAction extends MoveAction {
 775
 776         private ISnapAdvisor snapAdvisor;
 777         private Point2D      point = new Point2D.Double();
 778
 779         public SnappingMoveAction(RouteGraph rg, Object target, ISnapAdvisor snapAdvisor) {
 780             super(rg, target);
 781             this.snapAdvisor = snapAdvisor;
 782         }
 783
 784         protected void move(RouteGraph rg, Object target, double x, double y) {
 785             point.setLocation(x, y);
 786             snapAdvisor.snap(point);
 787             super.move(rg, target, point.getX(), point.getY());
 788         }
 789
 790         public static MoveAction create(RouteGraph rg, double x, double y, double tolerance, TargetFilter filter, ISnapAdvisor snapAdvisor) {
 791             Object target = rg.pick(x, y, tolerance, RouteGraph.PICK_LINES | RouteGraph.PICK_INTERIOR_POINTS);
 792             if (target != null && (filter == null || filter.accept(target))) {
 793                 if (snapAdvisor != null)
 794                     return new SnappingMoveAction(rg, target, snapAdvisor);
 795                 return new MoveAction(rg, target);
 796             }
 797             return null;
 798         }
 799
 800     }
 801
 802     @Override
 803     public int getEventMask() {
 804         return EventTypes.CommandMask | EventTypes.KeyMask | EventTypes.MouseMask;
 805     }
 806
 807 }