Refactor demo

Author: pcastornii

patternfx-demo/src/main/java/com/techsenger/patternfx/demo/Demo.java

@@ -33,9 +33,8 @@ public void start(Stage stage) throws Exception {
         var view = new PersonRegistryView(stage, viewModel);
         var component = new PersonRegistryComponent(view);
         component.initialize();
-        // just to show that every component must be deinitialized,
-        // it has no effect on the demo application
-        stage.setOnCloseRequest(e -> component.deinitialize());
+        // the component will be deinitialized automatically when the stage
+        // is closed, via the handler registered with stage#setOnCloseRequest.
     }
 
 }

patternfx-demo/src/main/java/com/techsenger/patternfx/demo/PersonRegistryView.java

@@ -88,19 +88,20 @@ protected void build() {
     @Override
     protected void bind() {
         super.bind();
-        var vm = getViewModel();
-        stage.titleProperty().bind(vm.titleProperty());
-        vm.selectedPersonProperty().bind(personTable.getSelectionModel().selectedItemProperty());
-        removeButton.disableProperty().bind(vm.removeDisabledProperty());
+        var viewModel = getViewModel();
+        stage.titleProperty().bind(viewModel.titleProperty());
+        viewModel.selectedPersonProperty().bind(personTable.getSelectionModel().selectedItemProperty());
+        removeButton.disableProperty().bind(viewModel.removeDisabledProperty());
     }
 
     @Override
     protected void addHandlers() {
         super.addHandlers();
-        var vm = getViewModel();
-        addButton.setOnAction(e -> vm.add());
-        removeButton.setOnAction(e -> vm.remove());
-        refreshButton.setOnAction(e -> vm.refresh());
+        var viewModel = getViewModel();
+        addButton.setOnAction(e -> viewModel.add());
+        removeButton.setOnAction(e -> viewModel.remove());
+        refreshButton.setOnAction(e -> viewModel.refresh());
+        stage.setOnCloseRequest(e -> viewModel.close());
     }
 
     Stage getStage() {

patternfx-demo/src/main/java/com/techsenger/patternfx/demo/PersonRegistryViewModel.java

@@ -109,6 +109,10 @@ void remove() {
         }
     }
 
+    void close() {
+        getMediator().deinitialize();
+    }
+
     private void add(Person person) {
         service.save(person);
         persons.add(person);