Angular Abstract Controller

myApp.controller('AbstractWidgetControl', function($scope) {
  $scope.errorMaskVisible = false;
  $scope.errorMessage = '';
  
  $scope.showErrorMask = function(message) {
    $scope.errorMessage = message || 'Unknown error occurred';
    $scope.errorMaskVisible = true;
  };
  
  $scope.hideErrorMask = function() {
    $scope.errorMaskVisible = false;
  }
});