update

ebpm-process-modeler/public/js/bpmn-js/lib/features/grid-snapping/behavior/AutoPlaceBehavior.js

@@ -0,0 +1,57 @@
+import { getNewShapePosition } from '../../auto-place/AutoPlaceUtil';
+
+import { getMid } from 'diagram-js/lib/layout/LayoutUtil';
+import { is } from '../../../util/ModelUtil';
+
+
+export default function AutoPlaceBehavior(eventBus, gridSnapping) {
+  eventBus.on('autoPlace', function(context) {
+    var source = context.source,
+        sourceMid = getMid(source),
+        shape = context.shape;
+
+    var position = getNewShapePosition(source, shape);
+
+    [ 'x', 'y' ].forEach(function(axis) {
+      var options = {};
+
+      // do not snap if x/y equal
+      if (position[ axis ] === sourceMid[ axis ]) {
+        return;
+      }
+
+      if (position[ axis ] > sourceMid[ axis ]) {
+        options.min = position[ axis ];
+      } else {
+        options.max = position[ axis ];
+      }
+
+      if (is(shape, 'bpmn:TextAnnotation')) {
+
+        if (isHorizontal(axis)) {
+          options.offset = -shape.width / 2;
+        } else {
+          options.offset = -shape.height / 2;
+        }
+
+      }
+
+      position[ axis ] = gridSnapping.snapValue(position[ axis ], options);
+
+    });
+
+    // must be returned to be considered by auto place
+    return position;
+  });
+}
+
+AutoPlaceBehavior.$inject = [
+  'eventBus',
+  'gridSnapping'
+];
+
+// helpers //////////
+
+function isHorizontal(axis) {
+  return axis === 'x';
+}

ebpm-process-modeler/public/js/bpmn-js/lib/features/grid-snapping/behavior/CreateParticipantBehavior.js

@@ -0,0 +1,36 @@
+import { is } from '../../../util/ModelUtil';
+
+var HIGHER_PRIORITY = 1750;
+
+
+export default function CreateParticipantBehavior(canvas, eventBus, gridSnapping) {
+  eventBus.on([
+    'create.start',
+    'shape.move.start'
+  ], HIGHER_PRIORITY, function(event) {
+    var context = event.context,
+        shape = context.shape,
+        rootElement = canvas.getRootElement();
+
+    if (!is(shape, 'bpmn:Participant') ||
+      !is(rootElement, 'bpmn:Process') ||
+      !rootElement.children.length) {
+      return;
+    }
+
+    var createConstraints = context.createConstraints;
+
+    if (!createConstraints) {
+      return;
+    }
+
+    shape.width = gridSnapping.snapValue(shape.width, { min: shape.width });
+    shape.height = gridSnapping.snapValue(shape.height, { min: shape.height });
+  });
+}
+
+CreateParticipantBehavior.$inject = [
+  'canvas',
+  'eventBus',
+  'gridSnapping'
+];

ebpm-process-modeler/public/js/bpmn-js/lib/features/grid-snapping/behavior/LayoutConnectionBehavior.js

@@ -0,0 +1,144 @@
+import inherits from 'inherits';
+
+import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';
+
+import { pointsAligned } from 'diagram-js/lib/util/Geometry';
+
+import {
+  assign
+} from 'min-dash';
+
+var HIGH_PRIORITY = 3000;
+
+
+/**
+ * Snaps connections with Manhattan layout.
+ */
+export default function LayoutConnectionBehavior(eventBus, gridSnapping, modeling) {
+  CommandInterceptor.call(this, eventBus);
+
+  this._gridSnapping = gridSnapping;
+
+  var self = this;
+
+  this.postExecuted([
+    'connection.create',
+    'connection.layout'
+  ], HIGH_PRIORITY, function(event) {
+    var context = event.context,
+        connection = context.connection,
+        hints = context.hints || {},
+        waypoints = connection.waypoints;
+
+    if (hints.connectionStart || hints.connectionEnd) {
+      return;
+    }
+
+    if (!hasMiddleSegments(waypoints)) {
+      return;
+    }
+
+    modeling.updateWaypoints(connection, self.snapMiddleSegments(waypoints));
+  });
+}
+
+LayoutConnectionBehavior.$inject = [
+  'eventBus',
+  'gridSnapping',
+  'modeling'
+];
+
+inherits(LayoutConnectionBehavior, CommandInterceptor);
+
+/**
+ * Snap middle segments of a given connection.
+ *
+ * @param {Array<Point>} waypoints
+ *
+ * @returns {Array<Point>}
+ */
+LayoutConnectionBehavior.prototype.snapMiddleSegments = function(waypoints) {
+  var gridSnapping = this._gridSnapping,
+      snapped;
+
+  waypoints = waypoints.slice();
+
+  for (var i = 1; i < waypoints.length - 2; i++) {
+
+    snapped = snapSegment(gridSnapping, waypoints[i], waypoints[i + 1]);
+
+    waypoints[i] = snapped[0];
+    waypoints[i + 1] = snapped[1];
+  }
+
+  return waypoints;
+};
+
+
+// helpers //////////
+
+/**
+ * Check wether a connection has a middle segments.
+ *
+ * @param {Array} waypoints
+ *
+ * @returns {boolean}
+ */
+function hasMiddleSegments(waypoints) {
+  return waypoints.length > 3;
+}
+
+/**
+ * Check wether an alignment is horizontal.
+ *
+ * @param {string} aligned
+ *
+ * @returns {boolean}
+ */
+function horizontallyAligned(aligned) {
+  return aligned === 'h';
+}
+
+/**
+ * Check wether an alignment is vertical.
+ *
+ * @param {string} aligned
+ *
+ * @returns {boolean}
+ */
+function verticallyAligned(aligned) {
+  return aligned === 'v';
+}
+
+/**
+ * Get middle segments from a given connection.
+ *
+ * @param {Array} waypoints
+ *
+ * @returns {Array}
+ */
+function snapSegment(gridSnapping, segmentStart, segmentEnd) {
+
+  var aligned = pointsAligned(segmentStart, segmentEnd);
+
+  var snapped = {};
+
+  if (horizontallyAligned(aligned)) {
+
+    // snap horizontally
+    snapped.y = gridSnapping.snapValue(segmentStart.y);
+  }
+
+  if (verticallyAligned(aligned)) {
+
+    // snap vertically
+    snapped.x = gridSnapping.snapValue(segmentStart.x);
+  }
+
+  if ('x' in snapped || 'y' in snapped) {
+    segmentStart = assign({}, segmentStart, snapped);
+    segmentEnd = assign({}, segmentEnd, snapped);
+  }
+
+  return [ segmentStart, segmentEnd ];
+}

ebpm-process-modeler/public/js/bpmn-js/lib/features/grid-snapping/behavior/index.js

@@ -0,0 +1,14 @@
+import AutoPlaceBehavior from './AutoPlaceBehavior';
+import CreateParticipantBehavior from './CreateParticipantBehavior';
+import LayoutConnectionBehavior from './LayoutConnectionBehavior';
+
+export default {
+  __init__: [
+    'gridSnappingAutoPlaceBehavior',
+    'gridSnappingCreateParticipantBehavior',
+    'gridSnappingLayoutConnectionBehavior',
+  ],
+  gridSnappingAutoPlaceBehavior: [ 'type', AutoPlaceBehavior ],
+  gridSnappingCreateParticipantBehavior: [ 'type', CreateParticipantBehavior ],
+  gridSnappingLayoutConnectionBehavior: [ 'type', LayoutConnectionBehavior ]
+};