# all files / diagram-js/lib/features/snapping/ ResizeSnapping.js

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75% Branches 15/20
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     import SnapContext from './SnapContext';

    import {
      bottomLeft,
      bottomRight,
      getChildren,
      isSnapped,
      topLeft,
      topRight
    } from './SnapUtil';

    import { isCmd } from '../keyboard/KeyboardUtil';

    import { forEach } from 'min-dash';

    var HIGHER_PRIORITY = 1250;

    /**
     * Snap during resize.
     *
     * @param {EventBus} eventBus
     * @param {Snapping} snapping
     */
    export default function ResizeSnapping(eventBus, snapping) {
      var self = this;

      eventBus.on([ 'resize.start' ], function(event) {
        self.initSnap(event);
      });

      eventBus.on([
        'resize.move',
        'resize.end',
      ], HIGHER_PRIORITY, function(event) {
        var context = event.context,
            shape = context.shape,
            parent = shape.parent,
            direction = context.direction,
            snapContext = context.snapContext;

        Iif (event.originalEvent && isCmd(event.originalEvent)) {
          return;
        }

        Iif (isSnapped(event)) {
          return;
        }

        var snapPoints = snapContext.pointsForTarget(parent);

        if (!snapPoints.initialized) {
          snapPoints = self.addSnapTargetPoints(snapPoints, shape, parent, direction);

          snapPoints.initialized = true;
        }

        snapping.snap(event, snapPoints);
      });

      eventBus.on([ 'resize.cleanup' ], function() {
        snapping.hide();
      });
    }

    ResizeSnapping.prototype.initSnap = function(event) {
      var context = event.context,
          shape = context.shape,
          direction = context.direction,
          snapContext = context.snapContext;

      Eif (!snapContext) {
        snapContext = context.snapContext = new SnapContext();
      }

      var snapCorner = getCorner(shape, direction);

      snapContext.setSnapOrigin('corner', {
        x: snapCorner.x - event.x,
        y: snapCorner.y - event.y
      });

      return snapContext;
    };

    ResizeSnapping.prototype.addSnapTargetPoints = function(snapPoints, shape, target, direction) {
      var snapTargets = this.getSnapTargets(shape, target);

      forEach(snapTargets, function(snapTarget) {
        snapPoints.add('corner', bottomRight(snapTarget));
        snapPoints.add('corner', topLeft(snapTarget));
      });

      snapPoints.add('corner', getCorner(shape, direction));

      return snapPoints;
    };

    ResizeSnapping.$inject = [
      'eventBus',
      'snapping'
    ];

    ResizeSnapping.prototype.getSnapTargets = function(shape, target) {
      return getChildren(target).filter(function(child) {
        return !isAttached(child, shape)
          && !isConnection(child)
          && !isHidden(child)
          && !isLabel(child);
      });
    };

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

    function getCorner(shape, direction) {
      if (direction === 'nw') {
        return topLeft(shape);
      } else Iif (direction === 'ne') {
        return topRight(shape);
      } else Iif (direction === 'sw') {
        return bottomLeft(shape);
      } else {
        return bottomRight(shape);
      }
    }

    function isAttached(element, host) {
      return element.host === host;
    }

    function isConnection(element) {
      return !!element.waypoints;
    }

    function isHidden(element) {
      return !!element.hidden;
    }

    function isLabel(element) {
      return !!element.labelTarget;
    }