ListView，通過雙擊選擇項目

Question

我有一個主窗口，用戶可以通過單擊ListView項目來選擇程序功能。然而，即使他完全在物品外點擊（白色箭頭），程序仍會啓動「數字生成器」功能。我不喜歡那樣。

public class MainRootController2 extends Controller implements Initializable { 

    @FXML 
    StackPane stackPane; 
    @FXML 
    ListView<String> listView; 
    private ObservableList<String> list; 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
     //making a list and setting a background 
     list = FXCollections.observableArrayList("Number Generator", "Cards"); 
     listView.setBackground(new Background(new BackgroundImage(new Image("MainRootBackground.jpg"), 
       BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT, 
       BackgroundPosition.CENTER, BackgroundSize.DEFAULT))); 
     listView.setItems(list); 
     listView.getSelectionModel().clearSelection(); 
    } 

    @Override 
    public Pane getMainPane() { 
     return stackPane; 
    } 

    /************************ EVENTS *************************/ 
    @FXML 
    private void listViewMouseDoubleClicked(MouseEvent e){ 
     if(e.getClickCount() > 1){ 
      String s = listView.getSelectionModel().getSelectedItem(); 

      switch(s){ 
       case "Number Generator": 
        ChangeTheRoot change = new ChangeTheRoot(); 
        if(change.initialize(Main.primaryStage, true, Main.NUMBER_GENERATOR_ROOT, "Number Generator", true, new NumberGeneratorController()) == false) 
         Dialogs.create().title("Error").masthead(null).message("Couldn't load the components!").showInformation(); 

        change.doFadingTransition(stackPane, Main.fadeOutMillis, Main.fadeInMillis, true); 
        break; 

       default: 
        break; 
      } 
     } 
    } 

} 

編輯....固定的版本：

public class MainRootController2 extends Controller implements Initializable { 

    @FXML 
    StackPane stackPane; 
    @FXML 
    ListView<String> listView; 
    private ObservableList<String> list; 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
     //making a list and setting a background 
     list = FXCollections.observableArrayList("Number Generator", "Cards"); 

     listView.setBackground(new Background(new BackgroundImage(new Image("MainRootBackground.jpg"), 
       BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT, 
       BackgroundPosition.CENTER, BackgroundSize.DEFAULT))); 
     listView.setItems(list); 
     listView.setCellFactory(new Callback<ListView<String>, ListCell<String>>() { 
            @Override 
            public ListCell<String> call(ListView<String> list) { 
             return new MouseClickListCell(); 
            } 

     }); 
     listView.getSelectionModel().clearSelection(); 
    } 

    @Override 
    public Pane getMainPane() { 
     return stackPane; 
    } 

    /************************ EVENTS *************************/ 
    private void fireUpTheFeature(String name){ 
     String s = listView.getSelectionModel().getSelectedItem(); 

     switch(s){ 
      case "Number Generator": 
       ChangeTheRoot change = new ChangeTheRoot(); 
       if(change.initialize(Main.primaryStage, true, Main.NUMBER_GENERATOR_ROOT, "Number Generator", true, new NumberGeneratorController()) == false) 
        Dialogs.create().title("Error").masthead(null).message("Couldn't load the components!").showInformation(); 

       change.doFadingTransition(stackPane, Main.fadeOutMillis, Main.fadeInMillis, true); 
       break; 
      case "Cards": 
       break; 
      default: 
       break; 
     } 

    } 

    public class MouseClickListCell extends ListCell<String> 
    { 
     @Override 
     protected void updateItem(String item, boolean empty) { 
      super.updateItem(item, empty); 

      if(empty) { 
       setText(null); 
       setOnMouseClicked(null); 
      } 
      else { 
       setText(item.toString()); 
       setOnMouseClicked(new EventHandler<MouseEvent>() { 

        @Override 
        public void handle(MouseEvent event) { 
         if(event.getClickCount() > 1){ 
          fireUpTheFeature(getItem()); 
         } 
        } 
       }); 
      } 
     } 
    } 
} 

Answer 1

我沒有看到你的FXML文件，但是從你的命名我能猜到你的控制器方法private void listViewMouseDoubleClicked(MouseEvent e)被觸發時您的ListView被點擊。

只要用戶點擊ListView區域中的任何地方，就會觸發此事件。你想要的是刪除onMouseClicked處理程序並將該代碼移動到您的ListCell渲染器中。

如果您只將鼠標偵聽器附加到非空單元格，只有在單擊了ListCell時纔會觸發代碼。

例如：

public static class MouseClickListCell<T> extends ListCell<T> 
{ 
    @Override 
    protected void updateItem(T item, boolean empty) { 
     super.updateItem(item, empty); 

     if(empty) { 
      setText(null); 
      setOnMouseClicked(null); 
     } 
     else { 
      setText(item.toString()); 
      setOnMouseClicked(ev -> doMagic()); 
     } 
    } 
}