improve(resize): restrict resizable elements

related bpmn-io/bpmn-js#140

lib/Modeler.js

@@ -69,7 +69,8 @@ Modeler.prototype._modelingModules = [
   require('diagram-js/lib/features/resize'),
   require('./features/modeling'),
   require('./features/context-pad'),
-  require('./features/palette')
+  require('./features/palette'),
+  require('./features/resize')
 ];
 
 

lib/features/resize/BpmnResizableElements.json

@@ -0,0 +1,6 @@
+{
+  "elements": [
+    "bpmn:Task",
+    "bpmn:SubProcess"
+  ]
+}

lib/features/resize/BpmnResizeHandler.js

@@ -0,0 +1,28 @@
+'use strict';
+
+var _ = require('lodash');
+
+var resizableElements = require('./BpmnResizableElements.json').elements;
+
+
+function BpmnResizeHandler(eventBus, resize) {
+
+  var isResizeAllowed = function(element) {
+    var isAllowed = _.contains(resizableElements, element.type);
+
+    if (isAllowed) {
+      return true;
+    } else {
+      return false;
+    }
+  };
+
+  // Register Handler
+  eventBus.on('canvas.init', function() {
+    resize.registerResizableHandler(isResizeAllowed);
+  });
+}
+
+module.exports = BpmnResizeHandler;
+
+BpmnResizeHandler.$inject = [ 'eventBus', 'resize' ];

lib/features/resize/index.js

@@ -0,0 +1,7 @@
+module.exports = {
+  __depends__: [
+    require('diagram-js/lib/features/resize')
+  ],
+  __init__: [ 'bpmnResizeHandler' ],
+  bpmnResizeHandler: [ 'type', require('./BpmnResizeHandler') ]
+};