gerrit.simantics Code Review - simantics/platform.git/blob

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in 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.g2d.diagram.participant.pointertool;
  13
  14 import java.awt.Shape;
  15 import java.awt.geom.AffineTransform;
  16 import java.awt.geom.Path2D;
  17 import java.awt.geom.Point2D;
  18 import java.awt.geom.Rectangle2D;
  19 import java.util.ArrayList;
  20 import java.util.Collections;
  21 import java.util.HashSet;
  22 import java.util.List;
  23 import java.util.Set;
  24
  25 import org.simantics.g2d.canvas.Hints;
  26 import org.simantics.g2d.canvas.ICanvasContext;
  27 import org.simantics.g2d.canvas.ICanvasParticipant;
  28 import org.simantics.g2d.canvas.IToolMode;
  29 import org.simantics.g2d.canvas.impl.CanvasContext;
  30 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
  31 import org.simantics.g2d.canvas.impl.DependencyReflection.Reference;
  32 import org.simantics.g2d.connection.IConnectionAdvisor;
  33 import org.simantics.g2d.connection.handler.ConnectionHandler;
  34 import org.simantics.g2d.diagram.DiagramHints;
  35 import org.simantics.g2d.diagram.handler.PickContext;
  36 import org.simantics.g2d.diagram.handler.PickRequest;
  37 import org.simantics.g2d.diagram.handler.PickRequest.PickPolicy;
  38 import org.simantics.g2d.diagram.handler.PickRequest.PickSorter;
  39 import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
  40 import org.simantics.g2d.diagram.participant.Selection;
  41 import org.simantics.g2d.diagram.participant.TerminalPainter;
  42 import org.simantics.g2d.diagram.participant.TerminalPainter.ChainedHoverStrategy;
  43 import org.simantics.g2d.diagram.participant.TerminalPainter.TerminalHoverStrategy;
  44 import org.simantics.g2d.diagram.participant.pointertool.TerminalUtil.TerminalInfo;
  45 import org.simantics.g2d.element.ElementClassProviders;
  46 import org.simantics.g2d.element.IElement;
  47 import org.simantics.g2d.element.IElementClassProvider;
  48 import org.simantics.g2d.elementclass.RouteGraphConnectionClass;
  49 import org.simantics.g2d.participant.KeyUtil;
  50 import org.simantics.g2d.participant.MouseUtil;
  51 import org.simantics.g2d.participant.TransformUtil;
  52 import org.simantics.g2d.scenegraph.SceneGraphConstants;
  53 import org.simantics.g2d.utils.CanvasUtils;
  54 import org.simantics.g2d.utils.GeometryUtils;
  55 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  56 import org.simantics.scenegraph.g2d.events.Event;
  57 import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
  58 import org.simantics.scenegraph.g2d.events.KeyEvent;
  59 import org.simantics.scenegraph.g2d.events.KeyEvent.KeyPressedEvent;
  60 import org.simantics.scenegraph.g2d.events.MouseEvent;
  61 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonPressedEvent;
  62 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseClickEvent;
  63 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseDragBegin;
  64 import org.simantics.scenegraph.g2d.events.command.Commands;
  65 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphNode;
  66 import org.simantics.scenegraph.g2d.snap.ISnapAdvisor;
  67 import org.simantics.utils.ObjectUtils;
  68 import org.simantics.utils.datastructures.context.IContext;
  69 import org.simantics.utils.datastructures.context.IContextListener;
  70 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
  71 import org.simantics.utils.datastructures.hints.IHintContext.Key;
  72 import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
  73 import org.simantics.utils.datastructures.hints.IHintObservable;
  74 import org.simantics.utils.threads.ThreadUtils;
  75
  76 /**
  77  * Pointer tool does the following operations with mouse:
  78  * <ul>
  79  * <li>Selections</li>
  80  * <li>Scale</li>
  81  * <li>Rotate</li>
  82  * <li>Translate</li>
  83  * <li>Draws connections (requires re-implementing
  84  * {@link #createConnectTool(TerminalInfo, int, Point2D)})</li>
  85  * </ul>
  86  *
  87  * Pointer tool is active only when {@link Hints#KEY_TOOL} is
  88  * {@value Hints#POINTERTOOL}.
  89  *
  90  * @author Toni Kalajainen
  91  */
  92 public class PointerInteractor extends AbstractDiagramParticipant {
  93
  94     /**
  95      * A hint key for terminal pick distance in control pixels.
  96      * @see #PICK_DIST
  97      */
  98     public static final Key KEY_PICK_DISTANCE = new KeyOf(Double.class, "PICK_DISTANCE");
  99
 100     /**
 101      * Default terminal pick distance in control pixels.
 102      * @see #DEFAULT_PICK_DISTANCE
 103      */
 104     public static final double PICK_DIST = 10;
 105
 106     /**
 107      * @see #altToggled(KeyEvent)
 108      */
 109     protected int              lastStateMask;
 110
 111     /**
 112      * @see #altToggled(KeyEvent)
 113      */
 114     protected boolean          temporarilyEnabledConnectTool = false;
 115
 116     public class DefaultHoverStrategy extends ChainedHoverStrategy {
 117         public DefaultHoverStrategy(TerminalHoverStrategy orig) {
 118             super(orig);
 119         }
 120         @Override
 121         public boolean highlightEnabled() {
 122             if (Hints.CONNECTTOOL.equals(getToolMode()))
 123                 return true;
 124
 125             boolean ct = connectToolModifiersPressed(lastStateMask);
 126             //System.out.println("highlightEnabled: " + String.format("%x", lastStateMask) + " : " + ct);
 127             return ct;
 128         }
 129         @Override
 130         public boolean canHighlight(TerminalInfo ti) {
 131             //boolean alt = (lastStateMask & MouseEvent.ALT_MASK) != 0;
 132             //System.out.println("canHighlight: " + String.format("%x", lastStateMask) + " : " + alt);
 133             //if (!alt)
 134             //   return false;
 135             IConnectionAdvisor advisor = diagram.getHint(DiagramHints.CONNECTION_ADVISOR);
 136             return advisor == null || advisor.canBeginConnection(null, ti.e, ti.t);
 137         }
 138     }
 139
 140     @Dependency Selection selection;
 141     @Dependency KeyUtil keys;
 142     @Dependency TransformUtil util;
 143     @Dependency PickContext pickContext;
 144     @Dependency MouseUtil mice;
 145     @Reference TerminalPainter terminalPainter;
 146
 147     /**
 148      * This must be higher than
 149      * {@link SceneGraphConstants#SCENEGRAPH_EVENT_PRIORITY}
 150      * ({@value SceneGraphConstants#SCENEGRAPH_EVENT_PRIORITY}) to allow for
 151      * better selection handling than is possible by using the plain scene graph
 152      * event handling facilities which are installed in {@link CanvasContext}.
 153      */
 154     public static final int TOOL_PRIORITY = 1 << 21;
 155
 156     /**
 157      * This must be lower than
 158      * {@link SceneGraphConstants#SCENEGRAPH_EVENT_PRIORITY} (
 159      * {@value SceneGraphConstants#SCENEGRAPH_EVENT_PRIORITY}) to not start box
 160      * handling before scene graph nodes have been given a chance to react
 161      * events.
 162      */
 163     public static final int BOX_SELECT_PRIORITY = 1 << 19;
 164
 165     private static final Path2D LINE10;
 166     private static final Path2D LINE15;
 167     private static final Path2D LINE20;
 168
 169     boolean clickSelect;
 170     boolean boxSelect;
 171     boolean dragElement, dndDragElement;
 172     boolean connect;
 173     boolean doubleClickEdit;
 174     protected IElementClassProvider elementClassProvider;
 175
 176     PickPolicy boxSelectMode = PickPolicy.PICK_CONTAINED_OBJECTS;
 177
 178     DefaultHoverStrategy hoverStrategy;
 179
 180     private PickSorter pickSorter;
 181
 182     public PointerInteractor() {
 183         this(true, true, true, false, true, false, ElementClassProviders.staticProvider(null), null);
 184     }
 185
 186     public PointerInteractor(PickSorter pickSorter) {
 187         this(true, true, true, false, true, false, ElementClassProviders.staticProvider(null), pickSorter);
 188     }
 189
 190     public PointerInteractor(boolean clickSelect, boolean boxSelect, boolean dragElement, boolean dndDragElement, boolean connect, IElementClassProvider ecp) {
 191         this(clickSelect, boxSelect, dragElement, dndDragElement, connect, false, ecp, null);
 192     }
 193
 194     public PointerInteractor(boolean clickSelect, boolean boxSelect, boolean dragElement, boolean dndDragElement, boolean connect, boolean doubleClickEdit, IElementClassProvider ecp, PickSorter pickSorter) {
 195         super();
 196         this.clickSelect = clickSelect;
 197         this.boxSelect = boxSelect;
 198         this.dragElement = dragElement;
 199         this.dndDragElement = dndDragElement;
 200         this.connect = connect;
 201         this.doubleClickEdit = doubleClickEdit;
 202         this.elementClassProvider = ecp;
 203         this.pickSorter = pickSorter;
 204     }
 205
 206     @Override
 207     public void addedToContext(ICanvasContext ctx) {
 208         super.addedToContext(ctx);
 209         hoverStrategy = new DefaultHoverStrategy((TerminalHoverStrategy) getHint(TerminalPainter.TERMINAL_HOVER_STRATEGY));
 210         setHint(TerminalPainter.TERMINAL_HOVER_STRATEGY, hoverStrategy);
 211
 212         getContext().getSceneGraph().setGlobalProperty(G2DSceneGraph.PICK_DISTANCE, getPickDistance());
 213         getHintStack().addKeyHintListener(KEY_PICK_DISTANCE, new HintListenerAdapter() {
 214             @Override
 215             public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 216                 getContext().getSceneGraph().setGlobalProperty(G2DSceneGraph.PICK_DISTANCE, getPickDistance());
 217             }
 218         });
 219     }
 220
 221     @EventHandler(priority = 0)
 222     public boolean handleStateMask(MouseEvent me) {
 223         lastStateMask = me.stateMask;
 224         if (temporarilyEnabledConnectTool) {
 225             if (!connectToolModifiersPressed(me.stateMask)) {
 226                 temporarilyEnabledConnectTool = false;
 227                 setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 228             }
 229         } else {
 230             // It may be that the mouse has come into this control
 231             // from outside and no key state changes have occurred yet.
 232             // In this case this code should take care of moving the canvas
 233             // context into CONNECTTOOL mode.
 234             if (getToolMode() == Hints.POINTERTOOL
 235                     && connectToolModifiersPressed(me.stateMask))
 236             {
 237                 temporarilyEnabledConnectTool = true;
 238                 setHint(Hints.KEY_TOOL, Hints.CONNECTTOOL);
 239             }
 240         }
 241         return false;
 242     }
 243
 244     private static int mask(int mask, int mask2, boolean set) {
 245         return set ? mask | mask2 : mask & ~mask2;
 246     }
 247
 248     @EventHandler(priority = -1)
 249     public boolean altToggled(KeyEvent ke) {
 250         int mods = ke.stateMask;
 251         boolean press = ke instanceof KeyPressedEvent;
 252         boolean modifierPressed = false;
 253         if (ke.keyCode == java.awt.event.KeyEvent.VK_ALT) {
 254             mods = mask(mods, MouseEvent.ALT_MASK, press);
 255             modifierPressed = true;
 256         }
 257         if (ke.keyCode == java.awt.event.KeyEvent.VK_ALT_GRAPH) {
 258             mods = mask(mods, MouseEvent.ALT_GRAPH_MASK, press);
 259             modifierPressed = true;
 260         }
 261         if (ke.keyCode == java.awt.event.KeyEvent.VK_SHIFT) {
 262             mods = mask(mods, MouseEvent.SHIFT_MASK, press);
 263             modifierPressed = true;
 264         }
 265         if (ke.keyCode == java.awt.event.KeyEvent.VK_CONTROL) {
 266             mods = mask(mods, MouseEvent.CTRL_MASK, press);
 267             modifierPressed = true;
 268         }
 269         if (ke.keyCode == java.awt.event.KeyEvent.VK_META) {
 270             // TODO: NO MASK FOR META!
 271             modifierPressed = true;
 272         }
 273         // Don't deny connecting when CTRL is marked pressed because ALT_GRAPH
 274         // is actually ALT+CTRL in SWT. There's no way in SWT to tell apart
 275         // CTRL+ALT and ALT GRAPH.
 276         boolean otherModifiers = (mods & (MouseEvent.SHIFT_MASK)) != 0;
 277         boolean altModifier = (mods & (MouseEvent.ALT_MASK | MouseEvent.ALT_GRAPH_MASK)) != 0;
 278         if (modifierPressed) {
 279             boolean altPressed = !otherModifiers && altModifier;
 280             lastStateMask = mods;
 281             if (altPressed) {
 282                 IToolMode mode = getToolMode();
 283                 if (mode == Hints.POINTERTOOL) {
 284                     //System.out.println("TEMP++");
 285                     temporarilyEnabledConnectTool = true;
 286                     setHint(Hints.KEY_TOOL, Hints.CONNECTTOOL);
 287                 }
 288             } else {
 289                 if (temporarilyEnabledConnectTool) {
 290                     //System.out.println("TEMP--");
 291                     temporarilyEnabledConnectTool = false;
 292                     setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 293                 }
 294             }
 295             // Make sure that TerminalPainter updates its scene graph.
 296             if (terminalPainter != null) {
 297                 terminalPainter.update(terminalPainter.highlightEnabled());
 298             }
 299         }
 300         return false;
 301     }
 302
 303     /**
 304      * @param controlPos
 305      * @return <code>null</code> if current canvas transform is not invertible
 306      */
 307     public Shape getCanvasPickShape(Point2D controlPos) {
 308         AffineTransform inverse = util.getInverseTransform();
 309         if (inverse == null)
 310             return null;
 311
 312         double      pd              = getPickDistance();
 313         Rectangle2D controlPickRect = new Rectangle2D.Double(controlPos.getX()-pd, controlPos.getY()-pd, pd*2, pd*2);
 314         Shape       canvasShape     = GeometryUtils.transformShape(controlPickRect, inverse);
 315         return canvasShape;
 316     }
 317
 318     public List<TerminalInfo> pickTerminals(Point2D controlPos)
 319     {
 320         Shape canvasPickRect = getCanvasPickShape(controlPos);
 321         if (canvasPickRect == null)
 322             return Collections.emptyList();
 323         return TerminalUtil.pickTerminals(getContext(), diagram, canvasPickRect, true, true);
 324     }
 325
 326     public TerminalInfo pickTerminal(Point2D controlPos)
 327     {
 328         Shape canvasPickRect = getCanvasPickShape(controlPos);
 329         if (canvasPickRect == null)
 330             return null;
 331         TerminalInfo ti = TerminalUtil.pickTerminal(getContext(), diagram, canvasPickRect);
 332         return ti;
 333     }
 334
 335     @EventHandler(priority = TOOL_PRIORITY)
 336     public boolean handlePress(MouseButtonPressedEvent me) {
 337         if (!connects())
 338             return false;
 339         if (me.button != MouseEvent.LEFT_BUTTON)
 340             return false;
 341
 342         IToolMode mode = getToolMode();
 343
 344         // It may be that the mouse has come into this control
 345         // from outside without focusing it and without any mouse
 346         // buttons being pressed. If the user is pressing the
 347         // connection modifier we need to temporarily enable connect
 348         // mode here and now.
 349         if (mode == Hints.POINTERTOOL && connectToolModifiersPressed(me.stateMask)) {
 350             temporarilyEnabledConnectTool = true;
 351             mode = Hints.CONNECTTOOL;
 352             setHint(Hints.KEY_TOOL, Hints.CONNECTTOOL);
 353         }
 354
 355         if (mode == Hints.CONNECTTOOL) {
 356             Point2D curCanvasPos = util.controlToCanvas(me.controlPosition, null);
 357             return checkInitiateConnectTool(me, curCanvasPos);
 358         }
 359
 360         return false;
 361     }
 362
 363     protected boolean checkInitiateConnectTool(MouseEvent me, Point2D mouseCanvasPos) {
 364         // Pick Terminal
 365         IToolMode mode = getToolMode();
 366         if (mode == Hints.CONNECTTOOL || connectToolModifiersPressed(me.stateMask)) {
 367             IConnectionAdvisor advisor = diagram.getHint(DiagramHints.CONNECTION_ADVISOR);
 368             TerminalInfo ti = pickTerminal(me.controlPosition);
 369
 370             ICanvasParticipant bsi = null;
 371             if (ti != null) {
 372                 if (advisor == null || advisor.canBeginConnection(null, ti.e, ti.t)) {
 373                     bsi = createConnectTool(ti, me.mouseId, mouseCanvasPos);
 374                 }
 375             } else {
 376                 ISnapAdvisor snapAdvisor = getHint(DiagramHints.SNAP_ADVISOR);
 377                 if (snapAdvisor != null)
 378                     snapAdvisor.snap(mouseCanvasPos);
 379
 380                 // Start connection out of thin air, without a terminal.
 381                 bsi = createConnectTool(null, me.mouseId, mouseCanvasPos);
 382             }
 383
 384             // Did we catch anything?
 385             if (bsi != null) {
 386                 startConnectTool(bsi);
 387                 return true;
 388             }
 389         }
 390
 391         return false;
 392     }
 393
 394     protected void startConnectTool(ICanvasParticipant tool) {
 395         getContext().add(tool);
 396         //System.out.println("TEMP: " + temporarilyEnabledConnectTool);
 397         if (temporarilyEnabledConnectTool) {
 398             // Resets pointer tool back into use if necessary after
 399             // connection has been finished or canceled.
 400             getContext().addContextListener(new ToolModeResetter(tool));
 401         }
 402     }
 403
 404     @EventHandler(priority = TOOL_PRIORITY)
 405     public boolean handleClick(MouseClickEvent me) {
 406         //System.out.println(getClass().getSimpleName() + ": mouse clicked: @ " + me.time);
 407
 408         if (hasDoubleClickEdit() && me.clickCount == 2) {
 409             if (handleDoubleClick(me))
 410                 return true;
 411         }
 412
 413         if (!hasClickSelect()) return false;
 414         if (!hasToolMode(Hints.POINTERTOOL)) return false;
 415
 416         // Don't handle any events where click count is more than 1 to prevent
 417         // current diagram selection from bouncing around unnecessarily.
 418         if (me.clickCount > 1)
 419             return false;
 420
 421         boolean isLeft = me.button == MouseEvent.LEFT_BUTTON;
 422         boolean isRight = me.button == MouseEvent.RIGHT_BUTTON;
 423         if (!isLeft && !isRight) return false;
 424
 425         boolean popupWasVisible = wasPopupJustClosed(me);
 426         boolean noModifiers = !anyModifierPressed(me);
 427         boolean isShiftPressed = me.hasAllModifiers(MouseEvent.SHIFT_MASK);
 428
 429         assertDependencies();
 430
 431         Shape       canvasPickRect  = getCanvasPickShape(me.controlPosition);
 432         int selectionId = me.mouseId;
 433
 434         PickRequest req = new PickRequest(canvasPickRect).context(getContext());
 435         req.pickPolicy = PickPolicy.PICK_INTERSECTING_OBJECTS;
 436         req.pickSorter = PickRequest.PickSorter.connectionSorter(pickSorter, req.pickArea.getBounds2D().getCenterX(), req.pickArea.getBounds2D().getCenterY());
 437
 438         //req.pickSorter = PickRequest.PickSorter.CONNECTIONS_LAST;
 439         List<IElement> pickables = new ArrayList<IElement>();
 440         pickContext.pick(diagram, req, pickables);
 441
 442         Set<IElement> currentSelection = selection.getSelection(selectionId);
 443
 444         // Clear selection
 445         if (pickables.isEmpty()) {
 446             if (!popupWasVisible) {
 447                 // Only clear selection on left button clicks.
 448                 if (isLeft) {
 449                     selection.clear(selectionId);
 450                 }
 451             }
 452             if (isRight) {
 453                 if (/*!currentSelection.isEmpty() &&*/ noModifiers)
 454                     setHint(DiagramHints.SHOW_POPUP_MENU, me.controlPosition);
 455             }
 456             return false;
 457         }
 458
 459         // Toggle select
 460         if ((me.stateMask & MouseEvent.CTRL_MASK) != 0) {
 461             if (isLeft) {
 462                 /*
 463                  * - If the mouse points to an object not in the selection, add it to selection.
 464                  * - If the mouse points to multiple objects, add the first.
 465                  * - If all objects the mouse points are already in selection, remove one of them from selection.
 466                  */
 467                 IElement removable = null;
 468                 for (int i = pickables.size() - 1; i >= 0; --i) {
 469                     IElement pickable = pickables.get(i);
 470                     if (selection.add(selectionId, pickable)) {
 471                         removable = null;
 472                         break;
 473                     } else
 474                         removable = pickable;
 475
 476                     // Do not perform rotating pick in toggle selection
 477                     // when only CTRL is pressed. Requires SHIFT+CTRL.
 478                     if (!isShiftPressed)
 479                         break;
 480                 }
 481                 if (removable != null)
 482                     selection.remove(selectionId, removable);
 483             }
 484             return false;
 485         }
 486
 487         boolean result = false;
 488
 489         // Click Select
 490         {
 491             if (isLeft && popupWasVisible)
 492                 // Popup menu is visible, just let it close
 493                 return false;
 494
 495             // Don't change selection on right clicks if there's more to pick
 496             // than a single element.
 497             if (isRight && pickables.size() > 1) {
 498                 IElement selectElement = singleElementAboveNonselectedConnections(currentSelection, pickables);
 499                 if (selectElement != null) {
 500                     selection.setSelection(selectionId, selectElement);
 501                 }
 502                 if (!currentSelection.isEmpty() && noModifiers)
 503                     setHint(DiagramHints.SHOW_POPUP_MENU, me.controlPosition);
 504                 return false;
 505             }
 506
 507             /*
 508              * Select the one object the mouse points to. If multiple object
 509              * are picked, select the one that is after the earliest by
 510              * index of the current selection when shift is pressed. Otherwise
 511              * always pick the topmost element.
 512              */
 513             IElement selectedPick = isShiftPressed
 514                     ? rotatingPick(currentSelection, pickables)
 515                             : pickables.get(pickables.size() - 1);
 516
 517             // Only select when
 518             // 1. the selection would actually change
 519             // AND
 520             //   2.1. left button was pressed
 521             //   OR
 522             //   2.2. right button was pressed and the element to-be-selected
 523             //        is NOT a part of the current selection
 524             if (!Collections.singleton(selectedPick).equals(currentSelection)
 525                     && (isLeft || (isRight && !currentSelection.contains(selectedPick)))) {
 526                 selection.setSelection(selectionId, selectedPick);
 527                 // Stop propagation
 528                 result = true;
 529             }
 530
 531             if (isRight && pickables.size() == 1 && noModifiers) {
 532                 setHint(DiagramHints.SHOW_POPUP_MENU, me.controlPosition);
 533             }
 534         }
 535
 536         return result;
 537     }
 538
 539     /**
 540      * A heuristic needed for implementing right-click diagram selection in a
 541      * sensible manner.
 542      *
 543      * @param currentSelection
 544      * @param pickables
 545      * @return
 546      */
 547     private IElement singleElementAboveNonselectedConnections(Set<IElement> currentSelection, List<IElement> pickables) {
 548         if (pickables.isEmpty())
 549             return null;
 550
 551         // Check that the pickable-list doesn't contain anything that is in the current selection.
 552         if (!Collections.disjoint(currentSelection, pickables))
 553             return null;
 554
 555         IElement top = pickables.get(pickables.size() - 1);
 556         boolean elementOnTop = !PickRequest.PickFilter.FILTER_CONNECTIONS.accept(top);
 557         if (!elementOnTop)
 558             return null;
 559         for (int i = pickables.size() - 2; i >= 0; --i) {
 560             IElement e = pickables.get(i);
 561             if (!PickRequest.PickFilter.FILTER_CONNECTIONS.accept(e))
 562                 return null;
 563         }
 564         return top;
 565     }
 566
 567     /**
 568      * Since there's seems to be no better method available for finding out if
 569      * the SWT popup menu was just recently closed or not, we use the following
 570      * heuristic:
 571      *
 572      * SWT popup was just closed if it was closed < 300ms ago.
 573      *
 574      * Note that this is a very bad heuristic and may fail on slower machines or
 575      * under heavy system load.
 576      *
 577      * @return
 578      */
 579     private boolean wasPopupJustClosed(Event event) {
 580         Long popupCloseTime = getHint(DiagramHints.POPUP_MENU_HIDDEN);
 581         if (popupCloseTime != null) {
 582             long timeDiff = event.time - popupCloseTime;
 583             //System.out.println("time diff: " + timeDiff);
 584             if (timeDiff < 300) {
 585                 //System.out.println("POPUP WAS JUST CLOSED!");
 586                 return true;
 587             }
 588         }
 589         //System.out.println("Popup has been closed for a while.");
 590         return false;
 591     }
 592
 593     boolean handleDoubleClick(MouseClickEvent me) {
 594         //System.out.println("mouse double clicked: " + me);
 595         if (!hasDoubleClickEdit()) return false;
 596         if (me.button != MouseEvent.LEFT_BUTTON) return false;
 597         if (getToolMode() != Hints.POINTERTOOL) return false;
 598         if (me.clickCount < 2) return false;
 599
 600         Shape       canvasPickRect  = getCanvasPickShape(me.controlPosition);
 601         int         selectionId     = me.mouseId;
 602
 603         PickRequest req             = new PickRequest(canvasPickRect).context(getContext());
 604         req.pickPolicy = PickPolicy.PICK_INTERSECTING_OBJECTS;
 605
 606         req.pickSorter = PickRequest.PickSorter.connectionSorter(pickSorter, req.pickArea.getBounds2D().getCenterX(), req.pickArea.getBounds2D().getCenterY());
 607         List<IElement> pick         = new ArrayList<IElement>();
 608         pickContext.pick(diagram, req, pick);
 609
 610         // Clear selection
 611         if (pick.isEmpty()) {
 612             selection.clear(selectionId);
 613             return false;
 614         }
 615
 616         IElement selectedPick = rotatingPick(selectionId, pick);
 617
 618         if (!selection.contains(selectionId, selectedPick)) {
 619             selection.setSelection(selectionId, selectedPick);
 620         }
 621
 622         CanvasUtils.sendCommand(getContext(), Commands.RENAME);
 623
 624         return false;
 625     }
 626
 627     // Values shared by #handleDrag and #handleBoxSelect
 628     private transient Point2D curCanvasDragPos = new Point2D.Double();
 629     private transient Set<IElement> elementsToDrag = Collections.emptySet();
 630
 631     /**
 632      * Invoked before scene graph event handling and {@link #handleBoxSelect(MouseDragBegin)}.
 633      * @param me
 634      * @return
 635      * @see #handleBoxSelect(MouseDragBegin)
 636      */
 637     @EventHandler(priority = TOOL_PRIORITY)
 638     public boolean handleDrag(MouseDragBegin me) {
 639         if (!hasElementDrag() && !hasBoxSelect()) return false;
 640         if (me.button != MouseEvent.LEFT_BUTTON) return false;
 641         if (getToolMode() != Hints.POINTERTOOL) return false;
 642         if (hasToolMode(me.mouseId)) return false;
 643
 644         boolean anyModifierPressed = me.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK);
 645         boolean nonSelectionModifierPressed = me.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK
 646                 ^ (MouseEvent.SHIFT_MASK /*| MouseEvent.CTRL_MASK*/));
 647
 648         if (nonSelectionModifierPressed)
 649             return false;
 650
 651         assertDependencies();
 652
 653         Point2D         curCanvasPos    = util.controlToCanvas(me.controlPosition, curCanvasDragPos);
 654         Shape       canvasPickRect  = getCanvasPickShape(me.controlPosition);
 655         PickRequest     req             = new PickRequest(canvasPickRect).context(getContext());
 656         req.pickPolicy = PickRequest.PickPolicy.PICK_INTERSECTING_OBJECTS;
 657         req.pickSorter = PickRequest.PickSorter.connectionSorter(pickSorter, req.pickArea.getBounds2D().getCenterX(), req.pickArea.getBounds2D().getCenterY());
 658         List<IElement>  picks           = new ArrayList<IElement>();
 659         pickContext.pick(diagram, req, picks);
 660
 661         Set<IElement> sel            = selection.getSelection(me.mouseId);
 662         IElement      topMostPick    = picks.isEmpty() ? null : picks.get(picks.size() - 1);
 663         Set<IElement> elementsToDrag = new HashSet<IElement>();
 664         this.elementsToDrag = elementsToDrag;
 665
 666         if (!Collections.disjoint(sel, picks)) {
 667             elementsToDrag.addAll(sel);
 668         } else {
 669             if (topMostPick != null && (sel.isEmpty() || !sel.contains(topMostPick))) {
 670                 selection.setSelection(me.mouseId, topMostPick);
 671                 sel = selection.getSelection(me.mouseId);
 672                 elementsToDrag.addAll(sel);
 673             }
 674         }
 675
 676         // Drag Elements
 677         if (!elementsToDrag.isEmpty() && hasElementDnDDrag()) {
 678             // To Be Implemented in the next Diagram data model.
 679         } else {
 680             if (!anyModifierPressed && !elementsToDrag.isEmpty() && hasElementDrag()) {
 681                 // Connections are not translatable, re-routing is in RouteGraphNode.
 682                 boolean onlyConnections = onlyConnections(elementsToDrag);
 683                 if (!onlyConnections) {
 684                     ICanvasParticipant tm = createTranslateTool(me.mouseId, me.startCanvasPos, curCanvasPos, elementsToDrag);
 685                     if (tm != null) {
 686                         getContext().add(tm);
 687                         return !onlyConnections;
 688                     }
 689                 } else {
 690                     // forward MouseDragBegin to closest RouteGraphNode
 691                     for (int i = picks.size() - 1; i >= 0; i--) {
 692                         RouteGraphNode rgn = picks.get(i).getHint(RouteGraphConnectionClass.KEY_RG_NODE);
 693                         if (rgn != null) {
 694                             rgn.handleDrag(me);
 695                             break;
 696                         }
 697                     }
 698                 }
 699             }
 700         }
 701
 702         return false;
 703     }
 704
 705     /**
 706      * Always invoked after after {@link #handleDrag(MouseDragBegin)} and scene
 707      * graph event handling to prevent the box selection mode from being
 708      * initiated before scene graph nodes have a chance to react.
 709      *
 710      * <p>
 711      * Note that this method assumes that <code>elementsToDrag</code> and
 712      * <code>curCanvasPos</code> are already set by
 713      * {@link #handleDrag(MouseDragBegin)}.
 714      *
 715      * @param me
 716      * @return
 717      */
 718     @EventHandler(priority = BOX_SELECT_PRIORITY)
 719     public boolean handleBoxSelect(MouseDragBegin me) {
 720         if (!hasBoxSelect()) return false;
 721         if (me.button != MouseEvent.LEFT_BUTTON) return false;
 722         if (getToolMode() != Hints.POINTERTOOL) return false;
 723         if (hasToolMode(me.mouseId)) return false;
 724
 725         boolean nonSelectionModifierPressed = me.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK
 726                 ^ (MouseEvent.SHIFT_MASK /*| MouseEvent.CTRL_MASK*/));
 727         if (nonSelectionModifierPressed)
 728             return false;
 729
 730         if (!nonSelectionModifierPressed && elementsToDrag.isEmpty()) {
 731             // Box Select
 732             ICanvasParticipant bsm = createBoxSelectTool(me.mouseId, me.startCanvasPos, curCanvasDragPos, me.button, boxSelectMode);
 733             if (bsm != null)
 734                 getContext().add(bsm);
 735         }
 736
 737         return false;
 738     }
 739
 740     private static boolean onlyConnections(Set<IElement> elements) {
 741         for (IElement e : elements)
 742             if (!e.getElementClass().containsClass(ConnectionHandler.class))
 743                 return false;
 744         return true;
 745     }
 746
 747     private IElement rotatingPick(int selectionId, List<IElement> pickables) {
 748         Set<IElement> sel = selection.getSelection(selectionId);
 749         return rotatingPick(sel, pickables);
 750     }
 751
 752     private IElement rotatingPick(Set<IElement> sel, List<IElement> pickables) {
 753         int earliestIndex = pickables.size();
 754         for (int i = pickables.size() - 1; i >= 0; --i) {
 755             if (sel.contains(pickables.get(i))) {
 756                 earliestIndex = i;
 757                 break;
 758             }
 759         }
 760         if (earliestIndex == 0)
 761             earliestIndex = pickables.size();
 762         IElement selectedPick = pickables.get(earliestIndex - 1);
 763         return selectedPick;
 764     }
 765
 766     /**
 767      * Is mouse in some kind of mode?
 768      * @param mouseId
 769      * @return
 770      */
 771     boolean hasToolMode(int mouseId) {
 772         for (AbstractMode am : getContext().getItemsByClass(AbstractMode.class))
 773             if (am.mouseId==mouseId) return true;
 774         return false;
 775     }
 776
 777     boolean hasToolMode(IToolMode mode) {
 778         return ObjectUtils.objectEquals(mode, getToolMode());
 779     }
 780
 781     boolean hasToolMode(IToolMode... modes) {
 782         IToolMode current = getToolMode();
 783         if (current == null)
 784             return false;
 785         for (IToolMode mode : modes)
 786             if (current.equals(mode))
 787                 return true;
 788         return false;
 789     }
 790
 791     protected IToolMode getToolMode() {
 792         return getHint(Hints.KEY_TOOL);
 793     }
 794
 795     /// is box select enabled
 796     protected boolean hasBoxSelect() {
 797         return boxSelect;
 798     }
 799
 800     /// is click select enabled
 801     protected boolean hasClickSelect() {
 802         return clickSelect;
 803     }
 804
 805     /// is double click edit enabled
 806     protected boolean hasDoubleClickEdit() {
 807         return doubleClickEdit;
 808     }
 809
 810     // is element drag enabled
 811     protected boolean hasElementDrag() {
 812         return dragElement;
 813     }
 814
 815     // is element drag enabled
 816     protected boolean hasElementDnDDrag() {
 817         return dndDragElement;
 818     }
 819
 820     // is connect enabled
 821     protected boolean connects() {
 822         return connect;
 823     }
 824
 825     public double getPickDistance() {
 826         Double pickDistance = getHint(KEY_PICK_DISTANCE);
 827         return pickDistance == null ? PICK_DIST : Math.max(pickDistance, 0);
 828     }
 829
 830     public PickPolicy getBoxSelectMode() {
 831         return boxSelectMode;
 832     }
 833
 834     public void setBoxSelectMode(PickPolicy boxSelectMode) {
 835         this.boxSelectMode = boxSelectMode;
 836     }
 837
 838     public void setSelectionEnabled(boolean select) {
 839         this.clickSelect = select;
 840         this.boxSelect = select;
 841         if(select == false) { // Clear all selections if select is disabled
 842             final int[] ids = selection.getSelectionIds();
 843             if(ids.length > 0) {
 844                 ThreadUtils.asyncExec(getContext().getThreadAccess(), new Runnable() {
 845                     @Override
 846                     public void run() {
 847                         for(int id : ids)
 848                             selection.clear(id);
 849                         getContext().getContentContext().setDirty();
 850                     }
 851                 });
 852             }
 853         }
 854     }
 855
 856     boolean anyModifierPressed(MouseEvent e) {
 857         return e.hasAnyModifier(MouseEvent.ALL_MODIFIERS_MASK);
 858     }
 859
 860     boolean connectToolModifiersPressed(int stateMask) {
 861         return (stateMask & (MouseEvent.ALT_MASK | MouseEvent.ALT_GRAPH_MASK)) != 0;
 862     }
 863
 864     static {
 865         LINE10 = new Path2D.Double();
 866         LINE10.moveTo(0, 0);
 867         LINE10.lineTo(10, 0);
 868         LINE10.lineTo(7, -3);
 869         LINE10.moveTo(10, 0);
 870         LINE10.lineTo(7, 3);
 871
 872         LINE15 = new Path2D.Double();
 873         LINE15.moveTo(0, 0);
 874         LINE15.lineTo(15, 0);
 875         LINE15.lineTo(12, -3);
 876         LINE15.moveTo(15, 0);
 877         LINE15.lineTo(12, 3);
 878
 879         LINE20 = new Path2D.Double();
 880         LINE20.moveTo(0, 0);
 881         LINE20.lineTo(20, 0);
 882         LINE20.lineTo(17, -3);
 883         LINE20.moveTo(20, 0);
 884         LINE20.lineTo(17, 3);
 885
 886     }
 887
 888     // CUSTOMIZE
 889
 890     protected ICanvasParticipant createConnectTool(TerminalInfo ti, int mouseId, Point2D startCanvasPos) {
 891         return null;
 892     }
 893
 894     protected ICanvasParticipant createConnectToolWithTerminals(List<TerminalInfo> tis, int mouseId, Point2D startCanvasPos) {
 895         return null;
 896     }
 897
 898     protected ICanvasParticipant createTranslateTool(int mouseId, Point2D startCanvasPos, Point2D curCanvasPos, Set<IElement> elementsToDrag) {
 899         return new TranslateMode(startCanvasPos, curCanvasPos, mouseId, elementsToDrag);
 900     }
 901
 902     protected ICanvasParticipant createBoxSelectTool(int mouseId, Point2D startCanvasPos, Point2D curCanvasPos, int button, PickPolicy boxSelectMode) {
 903         return new BoxSelectionMode(startCanvasPos, curCanvasPos, mouseId, button, boxSelectMode);
 904     }
 905
 906     /**
 907      * A context listener for resetting tool mode back to pointer mode after the
 908      * tracked participant has been removed.
 909      */
 910     protected class ToolModeResetter implements IContextListener<ICanvasParticipant> {
 911         private ICanvasParticipant tracked;
 912         public ToolModeResetter(ICanvasParticipant trackedParticipant) {
 913             this.tracked = trackedParticipant;
 914         }
 915         @Override
 916         public void itemAdded(IContext<ICanvasParticipant> sender, ICanvasParticipant item) {
 917         }
 918         @Override
 919         public void itemRemoved(IContext<ICanvasParticipant> sender, ICanvasParticipant item) {
 920             if (item == tracked) {
 921                 sender.removeContextListener(this);
 922                 if (!isRemoved() && !connectToolModifiersPressed(lastStateMask)) {
 923                     temporarilyEnabledConnectTool = false;
 924                     setHint(Hints.KEY_TOOL, Hints.POINTERTOOL);
 925                 }
 926             }
 927         }
 928     }
 929
 930 }