WIP

app/assets/javascripts/controllers/abstract/pure_ctrl.js

@@ -1,13 +1,25 @@
 export class PureCtrl {
   constructor(
-    $timeout
+    $scope,
+    $timeout,
+    application,
+    appState
   ) {
-    if(!$timeout) {
+    if (!$scope || !$timeout || !application || !appState) {
       throw 'Invalid PureCtrl construction.';
     }
+    this.$scope = $scope;
     this.$timeout = $timeout;
+    this.appState = appState;
+    this.application = application;
     this.state = {};
     this.props = {};
+    this.addAppStateObserver();
+    this.addAppEventObserver();
+    $scope.$on('$destroy', () => {
+      this.unsubApp();
+      this.unsubState();
+    });
   }
 
   async setState(state) {
@@ -25,4 +37,25 @@ export class PureCtrl {
     }
     this.props = Object.freeze(Object.assign({}, this.props, props));
   }
+
+  addAppStateObserver() {
+    this.unsubState = this.appState.addObserver((eventName, data) => {
+      this.onAppStateEvent(eventName, data);
+    });
+  }
+
+  addAppEventObserver() {
+    this.unsubApp = this.application.addEventObserver((eventName) => {
+      this.onApplicationEvent(eventName);
+    });
+  }
+
+  onApplicationEvent(eventName) {
+    /** Optional override */
+  }
+
+  onAppStateEvent(eventName, data) {
+    /** Optional override */
+  }
+
 }