GUACAMOLE-1904: Add new events to allow children to open/close the client menu.

guacamole/src/main/frontend/src/app/client/controllers/clientController.js

@@ -468,8 +468,21 @@ angular.module('client').controller('clientController', ['$scope', '$routeParams
         else if (menuShownPreviousState)
             $scope.applyParameterChanges($scope.focusedClient);
 
+        /* Broadcast changes to the menu display state */
+        $scope.$broadcast('guacMenuShown', menuShown);
+
     });
 
+    // Toggle the menu when the guacClientToggleMenu event is received
+    $scope.$on('guacToggleMenu',
+            () => $scope.menu.shown = !$scope.menu.shown);
+
+    // Show the menu when the guacClientShowMenu event is received
+    $scope.$on('guacShowMenu', () => $scope.menu.shown = true);
+
+    // Hide the menu when the guacClientHideMenu event is received
+    $scope.$on('guacHideMenu', () => $scope.menu.shown = false);
+
     // Automatically track and cache the currently-focused client
     $scope.$on('guacClientFocused', function focusedClientChanged(event, newFocusedClient) {