Detect $mdDialog close while pressing ESC - angularjs

Question

I have a $mdDialog with input fields. Before closing $mdDialog, the content of the input fields is saved. So, when a user press 'close' button, a function is called to perform some operation on data and save them. However, I could not detect closing of $mdDialog on ESC. Is it possible to detect the closing event with ESC in the $mdDialog controller ?
Here is the sample code.
Codepen link
angular.module('MyApp', ['ngMaterial'])
.controller('AppCtrl', function($scope, $mdDialog, $rootScope) {
//$rootScope is used only of this demo
$rootScope.draft = ' ';
$scope.showDialog = function(ev) {
var msgDialog = $mdDialog.show({
controller: 'DemoDialogCtrl',
template: "<md-input-container><label>Text</label><input type='text' ng-model='myText' placeholder='Write text here.'></md-input-container><md-button ng-click='close()'>Close</md-button>",
})
};
});
(function() {
angular
.module('MyApp')
.controller('DemoDialogCtrl', DemoDialogCtrl);
DemoDialogCtrl.$inject = ['$scope', '$rootScope', '$mdDialog'];
function DemoDialogCtrl($scope, $rootScope, $mdDialog) {
$scope.close = function() {
//$rootScope is used only of this demo
// In real code, there are some other operations
$rootScope.draft = $scope.myText;
$mdDialog.hide();
}
}
})();
<div ng-controller="AppCtrl" class="md-padding dialogdemoBasicUsage" id="popupContainer" ng-cloak="" ng-app="MyApp">
<div class="dialog-demo-content" layout="row" layout-wrap="" layout-margin="" layout-align="center">
<md-button class="md-primary md-raised" ng-click="showDialog($event)">
Open Dialog
</md-button>
<div id="status">
<p>(Text written in $mdDialog text field must appear here when user closes the $mddialog. User can press close button or press ESC button.
</p>
<b layout="row" layout-align="center center" class="md-padding">
Draft: {{draft}}
</b>
</div>
</div>
</div>

Answer 1

You should use promise api.
$mdDialog.show().finally(
function onModalClose(){
}
);
But sink with external code should be used with other mechanism, for example by providing scope.
var modalScope = $rootScope.$new(true);
$mdDialog.show({scope: modalScope}).finally(function(){
$rootScope.draft = modalScope.myText;
});