all files / Github/bpmn-js/lib/features/snapping/ BpmnCreateMoveSnapping.js

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100% Functions 14/14
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import inherits from 'inherits';
 
import CreateMoveSnapping from 'diagram-js/lib/features/snapping/CreateMoveSnapping';
 
import {
  isSnapped,
  setSnapped,
} from 'diagram-js/lib/features/snapping/SnapUtil';
 
import { is } from '../../util/ModelUtil';
 
import {
  asTRBL,
  getMid
} from 'diagram-js/lib/layout/LayoutUtil';
 
import { getBoundaryAttachment } from './BpmnSnappingUtil';
 
import { forEach } from 'min-dash';
 
var HIGH_PRIORITY = 1500;
 
 
/**
 * Snap during create and move.
 *
 * @param {BpmnRules} bpmnRules
 * @param {EventBus} eventBus
 * @param {Injector} injector
 */
export default function BpmnCreateMoveSnapping(bpmnRules, eventBus, injector) {
  injector.invoke(CreateMoveSnapping, this);
 
  // creating first participant
  eventBus.on([ 'create.move', 'create.end' ], HIGH_PRIORITY, setSnappedIfConstrained);
 
  function canAttach(shape, target, position) {
    return bpmnRules.canAttach([ shape ], target, null, position) === 'attach';
  }
 
  // snap boundary events
  eventBus.on([
    'create.move',
    'create.end',
    'shape.move.move',
    'shape.move.end'
  ], HIGH_PRIORITY, function(event) {
    var context = event.context,
        target = context.target,
        shape = context.shape;
 
    if (target && canAttach(shape, target, event) && !isSnapped(event)) {
      snapBoundaryEvent(event, target);
    }
  });
}
 
inherits(BpmnCreateMoveSnapping, CreateMoveSnapping);
 
BpmnCreateMoveSnapping.$inject = [
  'bpmnRules',
  'eventBus',
  'injector'
];
 
BpmnCreateMoveSnapping.prototype.initSnap = function(event) {
  var snapContext = CreateMoveSnapping.prototype.initSnap.call(this, event);
 
  var shape = event.shape;
 
  // snap to docking points
  forEach(shape.outgoing, function(connection) {
    var docking = connection.waypoints[0];
 
    docking = docking.original || docking;
 
    snapContext.setSnapOrigin(connection.id + '-docking', {
      x: docking.x - event.x,
      y: docking.y - event.y
    });
  });
 
  forEach(shape.incoming, function(connection) {
    var docking = connection.waypoints[connection.waypoints.length - 1];
 
    docking = docking.original || docking;
 
    snapContext.setSnapOrigin(connection.id + '-docking', {
      x: docking.x - event.x,
      y: docking.y - event.y
    });
  });
 
  if (is(shape, 'bpmn:Participant')) {
 
    // snap to borders with higher priority
    snapContext.setSnapLocations([ 'top-left', 'bottom-right', 'mid' ]);
  }
 
  return snapContext;
};
 
BpmnCreateMoveSnapping.prototype.addSnapTargetPoints = function(snapPoints, shape, target) {
  CreateMoveSnapping.prototype.addSnapTargetPoints.call(this, snapPoints, shape, target);
 
  var snapTargets = this.getSnapTargets(shape, target);
 
  // snap to docking points
  forEach(shape.incoming, function(connection) {
 
    Eif (!includes(snapTargets, connection.source)) {
      snapPoints.add('mid', getMid(connection.source));
    }
 
    var docking = connection.waypoints[0];
 
    snapPoints.add(connection.id + '-docking', docking.original || docking);
  });
 
 
  forEach(shape.outgoing, function(connection) {
 
    Eif (!includes(snapTargets, connection.target)) {
      snapPoints.add('mid', getMid(connection.target));
    }
 
    var docking = connection.waypoints[ connection.waypoints.length - 1 ];
 
    snapPoints.add(connection.id + '-docking', docking.original || docking);
  });
 
  // add sequence flow parents as snap targets
  if (is(target, 'bpmn:SequenceFlow')) {
    snapPoints = this.addSnapTargetPoints(snapPoints, shape, target.parent);
  }
 
  return snapPoints;
};
 
BpmnCreateMoveSnapping.prototype.getSnapTargets = function(shape, target) {
  return CreateMoveSnapping.prototype.getSnapTargets.call(this, shape, target)
    .filter(function(snapTarget) {
 
      // do not snap to lanes
      return !is(snapTarget, 'bpmn:Lane');
    });
};
 
// helpers //////////
 
function snapBoundaryEvent(event, target) {
  var targetTRBL = asTRBL(target);
 
  var direction = getBoundaryAttachment(event, target);
 
  if (/top/.test(direction)) {
    setSnapped(event, 'y', targetTRBL.top);
  } else
  if (/bottom/.test(direction)) {
    setSnapped(event, 'y', targetTRBL.bottom);
  }
 
  if (/left/.test(direction)) {
    setSnapped(event, 'x', targetTRBL.left);
  } else
  if (/right/.test(direction)) {
    setSnapped(event, 'x', targetTRBL.right);
  }
}
 
function setSnappedIfConstrained(event) {
  var context = event.context,
      createConstraints = context.createConstraints;
 
  if (!createConstraints) {
    return;
  }
 
  var top = createConstraints.top,
      right = createConstraints.right,
      bottom = createConstraints.bottom,
      left = createConstraints.left;
 
  if ((left && left >= event.x) || (right && right <= event.x)) {
    setSnapped(event, 'x', event.x);
  }
 
  Eif ((top && top >= event.y) || (bottom && bottom <= event.y)) {
    setSnapped(event, 'y', event.y);
  }
}
 
function includes(array, value) {
  return array.indexOf(value) !== -1;
}