feat(replace-preview): Add visual feedback during shape movement

Closes #325

lib/Modeler.js

@@ -138,7 +138,8 @@ Modeler.prototype._modelingModules = [
   require('./features/snapping'),
   require('./features/modeling'),
   require('./features/context-pad'),
-  require('./features/palette')
+  require('./features/palette'),
+  require('./features/replace-preview')
 ];
 
 

lib/features/modeling/behavior/MoveStartEventBehavior.js

@@ -4,58 +4,43 @@ var inherits = require('inherits');
 
 var CommandInterceptor = require('diagram-js/lib/command/CommandInterceptor');
 
-var forEach = require('lodash/collection').forEach;
+var forEach = require('lodash/collection/forEach');
-
-var isInterrupting = require('../../../util/DiUtil').isInterrupting,
-    isEventSubProcess = require('../../../util/DiUtil').isEventSubProcess,
-    is = require('../../../util/ModelUtil').is;
 
+var isEventSubProcess = require('../../../util/DiUtil').isEventSubProcess;
 
 /**
  * Defines the behavior when a start event is moved
  */
-function MoveStartEventBehavior(eventBus, bpmnReplace) {
+function MoveStartEventBehavior(eventBus, bpmnReplace, bpmnRules, elementRegistry) {
 
   CommandInterceptor.call(this, eventBus);
 
-  /**
-   * Replaces non-interrupting StartEvents by blank interrupting StartEvents,
-   * if the target is not an event sub process.
-   */
-  function replaceElement(element, target) {
-    if (!isEventSubProcess(target)) {
-      if (is(element, 'bpmn:StartEvent') && !isInterrupting(element) && element.type !== 'label') {
-        bpmnReplace.replaceElement(element, { type: 'bpmn:StartEvent' });
-      }
-    }
-  }
-
   this.postExecuted([ 'elements.move' ], function(event) {
 
-    var target = event.context.newParent;
+    var target = event.context.newParent,
+        elements = [];
 
     forEach(event.context.closure.topLevel, function(topLevelElements) {
-
+      if (isEventSubProcess(topLevelElements)) {
-      if(isEventSubProcess(topLevelElements)) {
+        elements = elements.concat(topLevelElements.children);
-
-        forEach(topLevelElements.children, function(element) {
-
-          replaceElement(element, target);
-        });
       } else {
-
+        elements = elements.concat(topLevelElements);
-        forEach(topLevelElements, function(element) {
-
-          replaceElement(element, target);
-        });
       }
     });
 
-  });
+    var canReplace = bpmnRules.canReplace(elements, target);
 
+    forEach(canReplace.replace, function(newElementData) {
+      var newElement = {
+        type: newElementData.type
+      };
+
+      bpmnReplace.replaceElement(elementRegistry.get(newElementData.id), newElement);
+    });
+  });
 }
 
-MoveStartEventBehavior.$inject = [ 'eventBus', 'bpmnReplace' ];
+MoveStartEventBehavior.$inject = [ 'eventBus', 'bpmnReplace', 'bpmnRules', 'elementRegistry' ];
 
 inherits(MoveStartEventBehavior, CommandInterceptor);
 

lib/features/modeling/rules/BpmnRules.js

@@ -4,13 +4,15 @@ var groupBy = require('lodash/collection/groupBy'),
     size = require('lodash/collection/size'),
     find = require('lodash/collection/find'),
     any = require('lodash/collection/any'),
+    forEach = require('lodash/collection/forEach'),
     inherits = require('inherits');
 
 var getParents = require('../ModelingUtil').getParents,
     is = require('../../../util/ModelUtil').is,
     getBusinessObject = require('../../../util/ModelUtil').getBusinessObject,
     isExpanded = require('../../../util/DiUtil').isExpanded,
-    isEventSubProcess = require('../../../util/DiUtil').isEventSubProcess;
+    isEventSubProcess = require('../../../util/DiUtil').isEventSubProcess,
+    isInterrupting = require('../../../util/DiUtil').isInterrupting;
 
 
 var RuleProvider = require('diagram-js/lib/features/rules/RuleProvider');
@@ -76,7 +78,9 @@ BpmnRules.prototype.init = function() {
         shapes = context.shapes,
         position = context.position;
 
-    return canAttach(shapes, target, null, position) || canMove(shapes, target, position);
+    return canAttach(shapes, target, null, position) ||
+           canReplace(shapes, target) ||
+           canMove(shapes, target, position);
   });
 
   this.addRule([ 'shape.create', 'shape.append' ], function(context) {
@@ -100,6 +104,8 @@ BpmnRules.prototype.canMove = canMove;
 
 BpmnRules.prototype.canAttach = canAttach;
 
+BpmnRules.prototype.canReplace = canReplace;
+
 BpmnRules.prototype.canDrop = canDrop;
 
 BpmnRules.prototype.canInsert = canInsert;
@@ -383,6 +389,58 @@ function canAttach(elements, target, source, position) {
   return 'attach';
 }
 
+
+/**
+ * Defines how to replace elements for a given target.
+ *
+ * Returns an array containing all elements which will be replaced.
+ *
+ * @example
+ *
+ *  [{ id: 'IntermediateEvent_2',
+ *     type: 'bpmn:StartEvent'
+ *   },
+ *   { id: 'IntermediateEvent_5',
+ *     type: 'bpmn:EndEvent'
+ *   }]
+ *
+ * @param  {Array} elements
+ * @param  {Object} target
+ *
+ * @return {Object} an object containing all elements which have to be replaced
+ */
+function canReplace(elements, target) {
+
+  if (!target) {
+    return false;
+  }
+
+  var canExecute = {
+    replace: []
+  };
+
+  forEach(elements, function(element) {
+
+    // replace a non-interrupting start event by a blank interrupting start event
+    // when the target is not an event sub process
+    if (!isEventSubProcess(target)) {
+
+      if (is(element, 'bpmn:StartEvent') &&
+          !isInterrupting(element) &&
+          element.type !== 'label' &&
+          canDrop(element, target)) {
+
+        canExecute.replace.push({
+          id: element.id,
+          type: 'bpmn:StartEvent'
+        });
+      }
+    }
+  });
+
+  return canExecute.replace.length ? canExecute : false;
+}
+
 function canMove(elements, target) {
 
   // only move if they have the same parent

lib/features/replace-preview/BpmnReplacePreview.js

@@ -0,0 +1,116 @@
+'use strict';
+
+var CommandInterceptor = require('diagram-js/lib/command/CommandInterceptor');
+
+var inherits = require('inherits');
+
+var assign = require('lodash/object/assign'),
+    forEach = require('lodash/collection/forEach'),
+    includes = require('lodash/collection/includes');
+
+var LOW_PRIORITY = 250;
+
+function BpmnReplacePreview(eventBus, elementRegistry, elementFactory, canvas, moveVisuals) {
+
+  CommandInterceptor.call(this, eventBus);
+
+  /**
+   * Replace the visuals of all elements in the context which can be replaced
+   *
+   * @param  {Object} context
+   */
+  function replaceVisual(context) {
+
+    var replacements = context.canExecute.replace;
+
+    forEach(replacements, function(newElementData) {
+
+      var id = newElementData.id;
+
+      var newElement = {
+        type: newElementData.type
+      };
+
+      // if the visual of the element is already replaced
+      if (includes(context.visualReplacements, id)) {
+        return;
+      }
+
+      var element = elementRegistry.get(id);
+
+      assign(newElement, { x: element.x, y: element.y });
+
+      // create a temporary shape
+      var tempShape = elementFactory.createShape(newElement);
+
+      canvas.addShape(tempShape, element.parent);
+
+      // select the original SVG element related to the element and hide it
+      var gfx = context.dragGroup.select('[data-element-id=' + element.id + ']');
+
+      if (gfx) {
+        gfx.attr({ display: 'none' });
+      }
+
+      // clone the gfx of the temporary shape and add it to the drag group
+      var dragger = moveVisuals.addDragger(context, tempShape);
+
+      context.visualReplacements.push({
+        id: id,
+        dragger: dragger
+      });
+
+      canvas.removeShape(tempShape);
+    });
+  }
+
+  /**
+   * Restore the original visuals of the previously replaced elements
+   *
+   * @param  {Object} context
+   */
+  function restoreVisual(context) {
+
+    var visualReplacements = context.visualReplacements;
+
+    forEach(visualReplacements, function(element) {
+
+      var originalGfx = context.dragGroup.select('[data-element-id=' + element.id + ']'),
+          idx;
+
+      if (originalGfx) {
+        originalGfx.attr({ display: 'inline' });
+      }
+
+      element.dragger.remove();
+
+      idx = visualReplacements.indexOf(element.id);
+
+      if (idx !== -1) {
+        visualReplacements.splice(idx, 1);
+      }
+    });
+  }
+
+  eventBus.on('shape.move.move', LOW_PRIORITY, function(event) {
+
+    var context = event.context,
+        canExecute = context.canExecute;
+
+    if (!context.visualReplacements) {
+      context.visualReplacements = [];
+    }
+
+    if (canExecute.replace) {
+      replaceVisual(context);
+    } else {
+      restoreVisual(context);
+    }
+  });
+}
+
+BpmnReplacePreview.$inject = [ 'eventBus', 'elementRegistry', 'elementFactory', 'canvas', 'moveVisuals' ];
+
+inherits(BpmnReplacePreview, CommandInterceptor);
+
+module.exports = BpmnReplacePreview;

lib/features/replace-preview/index.js

@@ -0,0 +1,5 @@
+module.exports = {
+  __depends__: [ require('diagram-js/lib/features/move') ],
+  __init__: ['bpmnReplacePreview'],
+  bpmnReplacePreview: [ 'type', require('./BpmnReplacePreview') ]
+};

test/spec/features/replace-preview/BpmnReplacePreview.bpmn

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn">
+  <bpmn:process id="Process_1" isExecutable="false">
+    <bpmn:subProcess id="SubProcess_1" triggeredByEvent="true">
+      <bpmn:startEvent id="StartEvent_1" isInterrupting="false">
+        <bpmn:messageEventDefinition />
+      </bpmn:startEvent>
+      <bpmn:startEvent id="StartEvent_2" />
+      <bpmn:startEvent id="StartEvent_3" isInterrupting="false">
+        <bpmn:timerEventDefinition />
+      </bpmn:startEvent>
+    </bpmn:subProcess>
+    <bpmn:subProcess id="SubProcess_2" triggeredByEvent="true" />
+    <bpmn:subProcess id="SubProcess_3" />
+  </bpmn:process>
+  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
+    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1">
+      <bpmndi:BPMNShape id="SubProcess_1_di" bpmnElement="SubProcess_1" isExpanded="true">
+        <dc:Bounds x="92" y="46" width="149" height="138" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="StartEvent_1_di" bpmnElement="StartEvent_1">
+        <dc:Bounds x="119" y="75" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="92" y="111" width="90" height="20" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="StartEvent_2_di" bpmnElement="StartEvent_2">
+        <dc:Bounds x="119" y="127" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="92" y="163" width="90" height="20" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="StartEvent_3_di" bpmnElement="StartEvent_3">
+        <dc:Bounds x="180" y="75" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="153" y="111" width="90" height="20" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="SubProcess_2_di" bpmnElement="SubProcess_2" isExpanded="true">
+        <dc:Bounds x="299" y="46" width="144" height="138" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="SubProcess_3_di" bpmnElement="SubProcess_3" isExpanded="true">
+        <dc:Bounds x="503" y="46" width="161" height="137" />
+      </bpmndi:BPMNShape>
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</bpmn:definitions>

test/spec/features/replace-preview/BpmnReplacePreviewSpec.js

@@ -0,0 +1,249 @@
+'use strict';
+
+var TestHelper = require('../../../TestHelper');
+
+/* global bootstrapModeler, inject */
+
+var replacePreviewModule = require('../../../../lib/features/replace-preview'),
+    modelingModule = require('../../../../lib/features/modeling'),
+    coreModule = require('../../../../lib/core');
+
+var Events = require('diagram-js/test/util/Events');
+
+var assign = require('lodash/object/assign');
+
+
+describe('features/replace-preview', function() {
+
+  var testModules = [ replacePreviewModule, modelingModule, coreModule ];
+
+  var diagramXML = require('./BpmnReplacePreview.bpmn');
+
+  var startEvent_1,
+      rootElement,
+      Event;
+
+  var getGfx,
+      moveShape;
+
+  beforeEach(bootstrapModeler(diagramXML, { modules: testModules }));
+
+  beforeEach(inject(function(canvas, elementRegistry, elementFactory, move, dragging) {
+
+    Event = Events.target(canvas._svg);
+
+    startEvent_1 = elementRegistry.get('StartEvent_1');
+    rootElement = canvas.getRootElement();
+
+    /**
+     * returns the gfx representation of an element type
+     *
+     * @param  {Object} elementData
+     *
+     * @return {Object}
+     */
+    getGfx = function(elementData) {
+      assign(elementData, { x: 0, y: 0 });
+
+      var tempShape = elementFactory.createShape(elementData);
+
+      canvas.addShape(tempShape, rootElement);
+
+      var gfx = elementRegistry.getGraphics(tempShape).clone();
+
+      canvas.removeShape(tempShape);
+
+      return gfx;
+    };
+
+    moveShape = function(shape, target, position) {
+      var startPosition = { x: shape.x + 10 + (shape.width / 2), y: shape.y + 30 + (shape.height / 2) };
+
+      move.start(Event.create(startPosition), shape);
+
+      dragging.hover({
+        element: target,
+        gfx: elementRegistry.getGraphics(target)
+      });
+
+      dragging.move(Event.create(position));
+    };
+
+  }));
+
+  it('should replace visuals at the same position as the replaced visual', inject(function(dragging) {
+
+    // when
+    moveShape(startEvent_1, rootElement, { x: 280, y: 120 });
+
+    // then
+    var dragGroup = dragging.active().data.context.dragGroup;
+
+    dragGroup[0].attr('display', 'inline');
+
+    expect(dragGroup[0].getBBox()).to.eql(dragGroup[1].getBBox());
+
+  }));
+
+
+  it('should hide the replaced visual',
+    inject(function(dragging) {
+
+    // when
+    moveShape(startEvent_1, rootElement, { x: 280, y: 120 });
+
+    // then
+    var dragGroup = dragging.active().data.context.dragGroup;
+
+    expect(dragGroup[0].attr('display')).to.equal('none');
+
+  }));
+
+
+  it('should not replace non-interrupting start event while hover over same event sub process',
+    inject(function(dragging, elementRegistry) {
+
+    // given
+    var subProcess_1 = elementRegistry.get('SubProcess_1');
+
+    // when
+    moveShape(startEvent_1, subProcess_1, { x: 210, y: 180 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    // check if the visual representation remains a non interrupting message start event
+    var startEventGfx = getGfx({
+      type: 'bpmn:StartEvent',
+      isInterrupting: false,
+      _eventDefinitionType: 'bpmn:MessageEventDefinition'
+    });
+
+    expect(context.dragGroup[0].innerSVG()).to.equal(startEventGfx.innerSVG());
+
+  }));
+
+
+  it('should replace non-interrupting start event while hover over root element',
+    inject(function(dragging, elementRegistry) {
+
+    // when
+    moveShape(startEvent_1, rootElement, { x: 280, y: 120 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    // check if the visual replacement is a blank interrupting start event
+    var startEventGfx = getGfx({ type: 'bpmn:StartEvent' });
+
+    expect(context.dragGroup[1].innerSVG()).to.equal(startEventGfx.innerSVG());
+
+  }));
+
+
+  it('should not replace non-interrupting start event while hover over another event sub process',
+    inject(function(dragging, elementRegistry) {
+
+    // given
+    var subProcess_2 = elementRegistry.get('SubProcess_2');
+
+    // when
+    moveShape(startEvent_1, subProcess_2, { x: 350, y: 120 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    // check if the visual representation remains a non interrupting message start event
+    var startEventGfx = getGfx({
+      type: 'bpmn:StartEvent',
+      isInterrupting: false,
+      _eventDefinitionType: 'bpmn:MessageEventDefinition'
+    });
+
+    expect(context.dragGroup[0].innerSVG()).to.equal(startEventGfx.innerSVG());
+
+  }));
+
+
+  it('should replace non-interrupting start event while hover over regular sub process',
+    inject(function(dragging, elementRegistry) {
+
+    // given
+    var subProcess_3 = elementRegistry.get('SubProcess_3');
+
+    // when
+    moveShape(startEvent_1, subProcess_3, { x: 600, y: 120 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    // check if the visual representation remains a non interrupting message start event
+    var startEventGfx = getGfx({ type: 'bpmn:StartEvent' });
+
+    expect(context.dragGroup[1].innerSVG()).to.equal(startEventGfx.innerSVG());
+
+  }));
+
+
+  it('should replace all non-interrupting start events in a selection of multiple elements',
+    inject(function(move, dragging, elementRegistry, selection) {
+
+    // given
+    var startEvent_2 = elementRegistry.get('StartEvent_2'),
+        startEvent_3 = elementRegistry.get('StartEvent_3');
+
+    // when
+    selection.select([ startEvent_1, startEvent_2, startEvent_3 ]);
+
+    moveShape(startEvent_1, rootElement, { x: 150, y: 250 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    // check if the visual replacements are blank interrupting start events
+    var startEventGfx = getGfx({ type: 'bpmn:StartEvent' });
+
+    expect(context.dragGroup[1].innerSVG()).to.equal(startEventGfx.innerSVG());
+    expect(context.dragGroup[3].innerSVG()).to.equal(startEventGfx.innerSVG());
+    expect(context.dragGroup[4].innerSVG()).to.equal(startEventGfx.innerSVG());
+
+  }));
+
+
+  it('should not replace any non-interrupting start events in a selection of multiple elements',
+    inject(function(move, dragging, elementRegistry, selection) {
+
+    // given
+    var startEvent_2 = elementRegistry.get('StartEvent_2'),
+        startEvent_3 = elementRegistry.get('StartEvent_3'),
+        subProcess_2 = elementRegistry.get('SubProcess_2');
+
+    var messageStartEventGfx = getGfx({
+      type: 'bpmn:StartEvent',
+      isInterrupting: false,
+      _eventDefinitionType: 'bpmn:MessageEventDefinition'
+    });
+
+    var timerStartEventGfx = getGfx({
+      type: 'bpmn:StartEvent',
+      isInterrupting: false,
+      _eventDefinitionType: 'bpmn:TimerEventDefinition'
+    });
+
+    var startEventGfx = getGfx({ type: 'bpmn:StartEvent' });
+
+    // when
+    selection.select([ startEvent_1, startEvent_2, startEvent_3 ]);
+
+    moveShape(startEvent_1, subProcess_2, { x: 350, y: 120 });
+
+    var context = dragging.active().data.context;
+
+    // then
+    expect(context.dragGroup[0].innerSVG()).to.equal(messageStartEventGfx.innerSVG());
+    expect(context.dragGroup[1].innerSVG()).to.equal(startEventGfx.innerSVG());
+    expect(context.dragGroup[2].innerSVG()).to.equal(timerStartEventGfx.innerSVG());
+
+  }));
+
+});

test/spec/features/replace/BpmnReplaceSpec.js

@@ -740,6 +740,7 @@ describe('features/replace', function() {
 
       // then
       expect(isInterrupting(startEventAfter)).to.be.true;
+      expect(startEventAfter.parent).to.equal(root);
 
     }));
 
@@ -760,6 +761,7 @@ describe('features/replace', function() {
 
       // then
       expect(isInterrupting(startEventAfter)).to.be.true;
+      expect(startEventAfter.parent).to.equal(subProcess);
 
     }));
 
@@ -786,6 +788,7 @@ describe('features/replace', function() {
 
       // then
       expect(startEvent.id).to.equal(startEventAfter.id);
+      expect(startEventAfter.parent).to.equal(eventSubProcess);
 
     }));
 
@@ -808,6 +811,7 @@ describe('features/replace', function() {
 
       // then
       expect(startEventAfter).to.equal(interruptingStartEvent);
+      expect(startEventAfter.parent).to.equal(root);
 
     }));
 
@@ -827,6 +831,7 @@ describe('features/replace', function() {
       })[0];
 
       expect(isInterrupting(replacedStartEvent)).to.be.true;
+      expect(replacedStartEvent.parent).to.equal(subProcess);
     }));