method() {
  if ($state.current.name === 'panelA') {
    do_something_for_panel_A();
  }
  if ($state.current.name === 'panelB') {
    do_something_for_panel_B();
  }
}

angular.module('my-app')
.directive('panelOne', function () {
  return {
    restrict: 'E',
    templateUrl: 'panel.html',
    controllerAs: 'panelCtrl',
    controller: 'PanelOneController',
    scope: true
  };
});

angular.module('my-app')
.directive('panelTwo', function () {
  return {
    restrict: 'E',
    templateUrl: 'panel.html',
    controllerAs: 'panelCtrl',
    controller: 'PanelTwoController',
    scope: true
  };
});