# all files / Github/bpmn-js/lib/features/modeling/behavior/ DropOnFlowBehavior.js

100% Statements 72/72
98.15% Branches 53/54
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     import inherits from 'inherits';

    import {
      assign,
      find,
      filter
    } from 'min-dash';

    import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';

    import {
      getApproxIntersection
    } from 'diagram-js/lib/util/LineIntersection';

    export default function DropOnFlowBehavior(eventBus, bpmnRules, modeling) {

      CommandInterceptor.call(this, eventBus);

      /**
       * Reconnect start / end of a connection after
       * dropping an element on a flow.
       */

      function insertShape(shape, targetFlow, position) {
        var waypoints = targetFlow.waypoints,
            waypointsBefore,
            waypointsAfter,
            dockingPoint,
            source,
            target,
            incomingConnection,
            outgoingConnection,
            oldOutgoing = shape.outgoing.slice(),
            oldIncoming = shape.incoming.slice();

        var intersection = getApproxIntersection(waypoints, position);

        if (intersection) {
          waypointsBefore = waypoints.slice(0, intersection.index);
          waypointsAfter = waypoints.slice(intersection.index + (intersection.bendpoint ? 1 : 0));

          // due to inaccuracy intersection might have been found
          if (!waypointsBefore.length || !waypointsAfter.length) {
            return;
          }

          dockingPoint = intersection.bendpoint ? waypoints[intersection.index] : position;

          // if last waypointBefore is inside shape's bounds, ignore docking point
          if (!isPointInsideBBox(shape, waypointsBefore[waypointsBefore.length-1])) {
            waypointsBefore.push(copy(dockingPoint));
          }

          // if first waypointAfter is inside shape's bounds, ignore docking point
          if (!isPointInsideBBox(shape, waypointsAfter[0])) {
            waypointsAfter.unshift(copy(dockingPoint));
          }
        }

        source = targetFlow.source;
        target = targetFlow.target;

        if (bpmnRules.canConnect(source, shape, targetFlow)) {
          // reconnect source -> inserted shape
          modeling.reconnectEnd(targetFlow, shape, waypointsBefore || position);

          incomingConnection = targetFlow;
        }

        if (bpmnRules.canConnect(shape, target, targetFlow)) {

          if (!incomingConnection) {
            // reconnect inserted shape -> end
            modeling.reconnectStart(targetFlow, shape, waypointsAfter || position);

            outgoingConnection = targetFlow;
          } else {
            outgoingConnection = modeling.connect(
              shape, target, { type: targetFlow.type, waypoints: waypointsAfter }
            );
          }
        }

        var duplicateConnections = [].concat(

          incomingConnection && filter(oldIncoming, function(connection) {
            return connection.source === incomingConnection.source;
          }) || [],

          outgoingConnection && filter(oldOutgoing, function(connection) {
            return connection.source === outgoingConnection.source;
          }) || []
        );

        if (duplicateConnections.length) {
          modeling.removeElements(duplicateConnections);
        }
      }

      this.preExecute('elements.move', function(context) {

        var newParent = context.newParent,
            shapes = context.shapes,
            delta = context.delta,
            shape = shapes[0];

        if (!shape || !newParent) {
          return;
        }

        // if the new parent is a connection,
        // change it to the new parent's parent
        if (newParent && newParent.waypoints) {
          context.newParent = newParent = newParent.parent;
        }

        var shapeMid = getMid(shape);
        var newShapeMid = {
          x: shapeMid.x + delta.x,
          y: shapeMid.y + delta.y
        };

        // find a connection which intersects with the
        // element's mid point
        var connection = find(newParent.children, function(element) {
          var canInsert = bpmnRules.canInsert(shapes, element);

          return canInsert && getApproxIntersection(element.waypoints, newShapeMid);
        });

        if (connection) {
          context.targetFlow = connection;
          context.position = newShapeMid;
        }

      }, true);

      this.postExecuted('elements.move', function(context) {

        var shapes = context.shapes,
            targetFlow = context.targetFlow,
            position = context.position;

        if (targetFlow) {
          insertShape(shapes[0], targetFlow, position);
        }

      }, true);

      this.preExecute('shape.create', function(context) {

        var parent = context.parent,
            shape = context.shape;

        if (bpmnRules.canInsert(shape, parent)) {
          context.targetFlow = parent;
          context.parent = parent.parent;
        }
      }, true);

      this.postExecuted('shape.create', function(context) {

        var shape = context.shape,
            targetFlow = context.targetFlow,
            position = context.position;

        if (targetFlow) {
          insertShape(shape, targetFlow, position);
        }
      }, true);
    }

    inherits(DropOnFlowBehavior, CommandInterceptor);

    DropOnFlowBehavior.$inject = [
      'eventBus',
      'bpmnRules',
      'modeling'
    ];

    // helpers /////////////////////

    function isPointInsideBBox(bbox, point) {
      var x = point.x,
          y = point.y;

      return x >= bbox.x &&
        x <= bbox.x + bbox.width &&
        y >= bbox.y &&
        y <= bbox.y + bbox.height;
    }

    function copy(obj) {
      return assign({}, obj);
    }

    function getMid(bounds) {

      return {
        x: Math.round(bounds.x + bounds.width / 2),
        y: Math.round(bounds.y + bounds.height / 2)
      };
    }