feat(modeling): move to rules infrastructure

Related to bpmn-io/diagram-js#55

lib/features/modeling/behavior/Drop.js

@@ -0,0 +1,30 @@
+var _ = require('lodash');
+
+
+function DropBehavior(eventBus, modeling) {
+
+  // sequence flow handling
+
+  eventBus.on([
+    'commandStack.shapes.move.postExecute'
+  ], function(e) {
+
+    var context = e.context,
+        closure = context.closure,
+        allConnections = closure.allConnections,
+        allShapes = closure.allShapes;
+
+    _.forEach(allConnections, function(c) {
+
+      // remove sequence flows having source / target on different parents
+      if (c.businessObject.$instanceOf('bpmn:SequenceFlow') && c.source.parent !== c.target.parent) {
+        modeling.removeConnection(c);
+      }
+    });
+  });
+
+}
+
+DropBehavior.$inject = [ 'eventBus', 'modeling' ];
+
+module.exports = DropBehavior;

lib/features/modeling/behavior/index.js

@@ -0,0 +1,4 @@
+module.exports = {
+  __init__: [ 'dropBehavior' ],
+  dropBehavior: [ 'type', require('./Drop') ]
+};