/
BpmnRules.js
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/
BpmnRules.js
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'use strict';
var groupBy = require('lodash/collection/groupBy'),
size = require('lodash/collection/size'),
find = require('lodash/collection/find'),
inherits = require('inherits');
var getParents = require('../ModelingUtil').getParents,
is = require('../../../util/ModelUtil').is,
getBusinessObject = require('../../../util/ModelUtil').getBusinessObject,
isExpanded = require('../../../util/DiUtil').isExpanded;
var RuleProvider = require('diagram-js/lib/features/rules/RuleProvider');
/**
* BPMN specific modeling rule
*/
function BpmnRules(eventBus) {
RuleProvider.call(this, eventBus);
}
inherits(BpmnRules, RuleProvider);
BpmnRules.$inject = [ 'eventBus' ];
module.exports = BpmnRules;
BpmnRules.prototype.init = function() {
this.addRule('connection.create', function(context) {
var source = context.source,
target = context.target;
return canConnect(source, target);
});
this.addRule('connection.reconnectStart', function(context) {
var connection = context.connection,
source = context.hover || context.source,
target = connection.target;
return canConnect(source, target, connection);
});
this.addRule('connection.reconnectEnd', function(context) {
var connection = context.connection,
source = connection.source,
target = context.hover || context.target;
return canConnect(source, target, connection);
});
this.addRule('connection.updateWaypoints', function(context) {
// OK! but visually ignore
return null;
});
this.addRule('shape.resize', function(context) {
var shape = context.shape,
newBounds = context.newBounds;
return canResize(shape, newBounds);
});
this.addRule('shapes.move', function(context) {
var target = context.newParent,
shapes = context.shapes;
return canMove(shapes, target);
});
this.addRule([ 'shape.create', 'shape.append' ], function(context) {
var target = context.parent,
shape = context.shape,
source = context.source;
return canCreate(shape, target, source);
});
};
BpmnRules.prototype.canConnectMessageFlow = canConnectMessageFlow;
BpmnRules.prototype.canConnectSequenceFlow = canConnectSequenceFlow;
BpmnRules.prototype.canConnectAssociation = canConnectAssociation;
BpmnRules.prototype.canMove = canMove;
BpmnRules.prototype.canDrop = canDrop;
BpmnRules.prototype.canInsert = canInsert;
BpmnRules.prototype.canCreate = canCreate;
BpmnRules.prototype.canConnect = canConnect;
BpmnRules.prototype.canResize = canResize;
/**
* Utility functions for rule checking
*/
function nonExistantOrLabel(element) {
return !element || isLabel(element);
}
function isSame(a, b) {
return a === b;
}
function getOrganizationalParent(element) {
var bo = getBusinessObject(element);
while (bo && !is(bo, 'bpmn:Process')) {
if (is(bo, 'bpmn:Participant')) {
return bo.processRef || bo;
}
bo = bo.$parent;
}
return bo;
}
function isSameOrganization(a, b) {
var parentA = getOrganizationalParent(a),
parentB = getOrganizationalParent(b);
return parentA === parentB;
}
function isMessageFlowSource(element) {
return is(element, 'bpmn:InteractionNode') && (
!is(element, 'bpmn:Event') || (
is(element, 'bpmn:ThrowEvent') &&
hasEventDefinitionOrNone(element, 'bpmn:MessageEventDefinition')
)
);
}
function isMessageFlowTarget(element) {
return is(element, 'bpmn:InteractionNode') && (
!is(element, 'bpmn:Event') || (
is(element, 'bpmn:CatchEvent') &&
hasEventDefinitionOrNone(element, 'bpmn:MessageEventDefinition')
)
);
}
function getScopeParent(element) {
var bo = getBusinessObject(element);
if (is(bo, 'bpmn:Participant')) {
return null;
}
while (bo) {
bo = bo.$parent;
if (is(bo, 'bpmn:FlowElementsContainer')) {
return bo;
}
}
return bo;
}
function isSameScope(a, b) {
var scopeParentA = getScopeParent(a),
scopeParentB = getScopeParent(b);
return scopeParentA && (scopeParentA === scopeParentB);
}
function hasEventDefinition(element, eventDefinition) {
var bo = getBusinessObject(element);
return !!find(bo.eventDefinitions || [], function(definition) {
return is(definition, eventDefinition);
});
}
function hasEventDefinitionOrNone(element, eventDefinition) {
var bo = getBusinessObject(element);
return (bo.eventDefinitions || []).every(function(definition) {
return is(definition, eventDefinition);
});
}
function isSequenceFlowSource(element) {
return is(element, 'bpmn:FlowNode') && !is(element, 'bpmn:EndEvent') && !(
is(element, 'bpmn:IntermediateThrowEvent') &&
hasEventDefinition(element, 'bpmn:LinkEventDefinition')
);
}
function isSequenceFlowTarget(element) {
return is(element, 'bpmn:FlowNode') && !is(element, 'bpmn:StartEvent') && !(
is(element, 'bpmn:IntermediateCatchEvent') &&
hasEventDefinition(element, 'bpmn:LinkEventDefinition')
);
}
function isEventBasedTarget(element) {
return is(element, 'bpmn:ReceiveTask') || (
is(element, 'bpmn:IntermediateCatchEvent') && (
hasEventDefinition(element, 'bpmn:MessageEventDefinition') ||
hasEventDefinition(element, 'bpmn:TimerEventDefinition') ||
hasEventDefinition(element, 'bpmn:ConditionalEventDefinition') ||
hasEventDefinition(element, 'bpmn:SignalEventDefinition')
)
);
}
function isLabel(element) {
return element.labelTarget;
}
function isConnection(element) {
return element.waypoints;
}
function isParent(possibleParent, element) {
var allParents = getParents(element);
return allParents.indexOf(possibleParent) !== -1;
}
function canConnect(source, target, connection) {
if (nonExistantOrLabel(source) || nonExistantOrLabel(target)) {
return null;
}
// See https://github.com/bpmn-io/bpmn-js/issues/178
// as a workround we disallow connections with same
// target and source element.
// This rule must be removed if a auto layout for this
// connections is implemented.
if (isSame(source, target)) {
return false;
}
if (canConnectMessageFlow(source, target) ||
canConnectSequenceFlow(source, target)) {
return true;
}
if (is(connection, 'bpmn:Association')) {
return canConnectAssociation(source, target);
}
return false;
}
/**
* Can an element be dropped into the target element
*
* @return {Boolean}
*/
function canDrop(element, target) {
// can move labels everywhere
if (isLabel(element) && !isConnection(target)) {
return true;
}
// allow to create new participants on
// on existing collaboration and process diagrams
if (is(element, 'bpmn:Participant')) {
return is(target, 'bpmn:Process') || is(target, 'bpmn:Collaboration');
}
// drop flow elements onto flow element containers
// and participants
if (is(element, 'bpmn:FlowElement')) {
if (is(target, 'bpmn:FlowElementsContainer')) {
return isExpanded(target) !== false;
}
return is(target, 'bpmn:Participant');
}
if (is(element, 'bpmn:Artifact')) {
return is(target, 'bpmn:Collaboration') ||
is(target, 'bpmn:Participant') ||
is(target, 'bpmn:Process');
}
if (is(element, 'bpmn:MessageFlow')) {
return is(target, 'bpmn:Collaboration');
}
return false;
}
function canMove(elements, target) {
// only move if they have the same parent
var sameParent = size(groupBy(elements, function(s) { return s.parent && s.parent.id; })) === 1;
if (!sameParent) {
return false;
}
if (!target) {
return true;
}
return elements.every(function(element) {
return canDrop(element, target);
});
}
function canCreate(shape, target, source) {
if (!target) {
return false;
}
if (isLabel(target)) {
return null;
}
if (isSame(source, target)) {
return false;
}
// ensure we do not drop the element
// into source
if (source && isParent(source, target)) {
return false;
}
return canDrop(shape, target) || canInsert(shape, target);
}
function canResize(shape, newBounds) {
if (is(shape, 'bpmn:SubProcess')) {
return isExpanded(shape) && (
!newBounds || (newBounds.width >= 100 && newBounds.height >= 80)
);
}
if (is(shape, 'bpmn:Participant')) {
return !newBounds || (newBounds.width >= 100 && newBounds.height >= 80);
}
if (is(shape, 'bpmn:TextAnnotation')) {
return true;
}
return false;
}
function canConnectAssociation(source, target) {
// do not connect connections
if (isConnection(source) || isConnection(target)) {
return false;
}
// connect if different parent
return !isParent(target, source) &&
!isParent(source, target);
}
function canConnectMessageFlow(source, target) {
return isMessageFlowSource(source) &&
isMessageFlowTarget(target) &&
!isSameOrganization(source, target);
}
function canConnectSequenceFlow(source, target) {
return isSequenceFlowSource(source) &&
isSequenceFlowTarget(target) &&
isSameScope(source, target) &&
!(is(source, 'bpmn:EventBasedGateway') && !isEventBasedTarget(target));
}
function canInsert(shape, flow) {
// return true if we can drop on the
// underlying flow parent
//
// at this point we are not really able to talk
// about connection rules (yet)
return (
is(flow, 'bpmn:SequenceFlow') ||
is(flow, 'bpmn:MessageFlow')
) && canDrop(shape, flow.parent);
}