# all files / Github/diagram-js/lib/features/bendpoints/ BendpointMovePreview.js

96.34% Statements 79/82
73.08% Branches 19/26
100% Functions 6/6
96.34% Lines 79/82

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     import {
      classes as svgClasses,
      remove as svgRemove
    } from 'tiny-svg';

    import {
      addBendpoint
    } from './BendpointUtil';

    import {
      filterRedundantWaypoints
    } from '../../layout/LayoutUtil';

    import { translate } from '../../util/SvgTransformUtil';

    var MARKER_OK = 'connect-ok',
        MARKER_NOT_OK = 'connect-not-ok',
        MARKER_CONNECT_HOVER = 'connect-hover',
        MARKER_CONNECT_UPDATING = 'djs-updating',
        MARKER_ELEMENT_HIDDEN = 'djs-element-hidden';

    var COMMAND_RECONNECT_START = 'connection.reconnectStart',
        COMMAND_RECONNECT_END = 'connection.reconnectEnd';

    var HIGH_PRIORITY = 1100;

    /**
     * A component that implements moving of bendpoints
     */
    export default function BendpointMovePreview(injector, eventBus, canvas) {

      var connectionPreview = injector.get('connectionPreview', false),
          connectionDocking = injector.get('connectionDocking', false);

      // DRAGGING IMPLEMENTATION

      eventBus.on('bendpoint.move.start', function(e) {

        var context = e.context,
            connection = context.connection,
            originalWaypoints = connection.waypoints,
            waypoints = originalWaypoints.slice(),
            insert = context.insert,
            idx = context.bendpointIndex;

        // save waypoints to restore at the end
        context.originalWaypoints = originalWaypoints;

        if (insert) {
          // insert placeholder for bendpoint to-be-added
          waypoints.splice(idx, 0, { x: e.x, y: e.y });
        }

        connection.waypoints = waypoints;

        // add dragger gfx
        context.draggerGfx = addBendpoint(canvas.getLayer('overlays'));
        svgClasses(context.draggerGfx).add('djs-dragging');

        canvas.addMarker(connection, MARKER_CONNECT_UPDATING);
        canvas.addMarker(connection, MARKER_ELEMENT_HIDDEN);
      });

      eventBus.on('bendpoint.move.hover', function(e) {
        var context = e.context,
            allowed = context.allowed,
            hover = context.hover;

        Eif (e.hover) {
          canvas.addMarker(hover, MARKER_CONNECT_HOVER);

          Eif (allowed) {
            canvas.removeMarker(hover, MARKER_NOT_OK);
            canvas.addMarker(hover, MARKER_OK);
          } else if (allowed === false) {
            canvas.removeMarker(hover, MARKER_OK);
            canvas.addMarker(hover, MARKER_NOT_OK);
          }
        }
      });

      eventBus.on([
        'bendpoint.move.out',
        'bendpoint.move.cleanup'
      ], HIGH_PRIORITY, function(e) {

        // remove connect marker
        // if it was added
        var hover = e.context.hover;

        if (hover) {
          canvas.removeMarker(hover, MARKER_CONNECT_HOVER);
          canvas.removeMarker(hover, e.context.target ? MARKER_OK : MARKER_NOT_OK);
        }
      });

      eventBus.on('bendpoint.move.move', function(e) {

        var context = e.context,
            moveType = context.type,
            connection = e.connection,
            originalWaypoints = connection.waypoints,
            waypoints = originalWaypoints.slice(),
            bendpoint = { x: e.x, y: e.y },
            hints;

        if (connectionPreview) {
          hints = {
            source: connection.source,
            target: connection.target
          };

          if (moveType === COMMAND_RECONNECT_START) {
            hints.source = context.target;
            hints.connectionStart = bendpoint;
          } else if (moveType === COMMAND_RECONNECT_END) {
            hints.target = context.target;
            hints.connectionEnd = bendpoint;
          } else {
            hints.noCropping = true;
            hints.noLayout = true;
            waypoints[context.bendpointIndex] = bendpoint;
          }

          Eif (connectionDocking) {
            // (0) temporarily assign new waypoints
            connection.waypoints = waypoints;

            // (1) crop connection with new waypoints and save them
            connection.waypoints = connectionDocking.getCroppedWaypoints(connection);
            waypoints = connection.waypoints;

            // (2) restore original waypoints to not mutate connection directly
            connection.waypoints = originalWaypoints;
          }

          // remove overlapping points
          hints.waypoints = filterRedundantWaypoints(waypoints);

          connectionPreview.drawPreview(context, context.allowed, hints);
        }

        // add dragger gfx
        translate(context.draggerGfx, e.x, e.y);
      });

      eventBus.on([
        'bendpoint.move.end',
        'bendpoint.move.cancel'
      ], HIGH_PRIORITY, function(e) {

        var context = e.context,
            hover = context.hover,
            connection = context.connection;

        // reassign original waypoints
        connection.waypoints = context.originalWaypoints;

        // remove dragger gfx
        svgRemove(context.draggerGfx);

        canvas.removeMarker(connection, MARKER_CONNECT_UPDATING);
        canvas.removeMarker(connection, MARKER_ELEMENT_HIDDEN);

        if (hover) {
          canvas.removeMarker(hover, MARKER_OK);
          canvas.removeMarker(hover, context.target ? MARKER_OK : MARKER_NOT_OK);
        }

        if (connectionPreview) {
          connectionPreview.cleanUp(context);
        }
      });
    }

    BendpointMovePreview.$inject = [
      'injector',
      'eventBus',
      'canvas'
    ];