如何在JavaFX中使用VBox移動項目（通過拖動更改順序）？

Question

我想在VBox中拖動TitledPane.I在VBox中有n個Titlepane。我想在拖動時改變它們的順序。我嘗試了一些MouseEvent和DragEvents。但它不適合我。

但是我需要將Titledpane移動到哪個位置的索引。基於此，我需要在後端做些事情。請幫幫我。

感謝

Answer 1

這對我的作品......

private static final String TAB_DRAG_KEY = "titledpane"; 
private ObjectProperty<TitledPane> draggingTab; 
@Override 
public void start(Stage primaryStage) throws Exception { 
    draggingTab = new SimpleObjectProperty<TitledPane>(); 
    VBox vbox=new VBox(); 
    for(int i=0;i<4;i++) { 
     final TitledPane pane=new TitledPane(); 
     pane.setText("pane"+(i+1)); 
     vbox.getChildren().add(pane); 
     pane.setOnDragOver(new EventHandler<DragEvent>() { 
      @Override 
      public void handle(DragEvent event) { 
       final Dragboard dragboard = event.getDragboard(); 
       if (dragboard.hasString() 
         && TAB_DRAG_KEY.equals(dragboard.getString()) 
         && draggingTab.get() != null) { 
        event.acceptTransferModes(TransferMode.MOVE); 
        event.consume(); 
       } 
      } 
     }); 
     pane.setOnDragDropped(new EventHandler<DragEvent>() { 
      public void handle(final DragEvent event) { 
       Dragboard db = event.getDragboard(); 
       boolean success = false; 
       if (db.hasString()) { 
        Pane parent = (Pane) pane.getParent(); 
        Object source = event.getGestureSource(); 
        int sourceIndex = parent.getChildren().indexOf(source); 
        int targetIndex = parent.getChildren().indexOf(pane); 
        List<Node> nodes = new ArrayList<Node>(parent.getChildren()); 
        if (sourceIndex < targetIndex) { 
         Collections.rotate(
           nodes.subList(sourceIndex, targetIndex + 1), -1); 
        } else { 
         Collections.rotate(
           nodes.subList(targetIndex, sourceIndex + 1), 1); 
        } 
        parent.getChildren().clear(); 
        parent.getChildren().addAll(nodes); 
        success = true; 
       } 
       event.setDropCompleted(success); 
       event.consume(); 
      } 
     }); 
     pane.setOnDragDetected(new EventHandler<MouseEvent>() { 
      @Override 
      public void handle(MouseEvent event) { 
       Dragboard dragboard = pane.startDragAndDrop(TransferMode.MOVE); 
       ClipboardContent clipboardContent = new ClipboardContent(); 
       clipboardContent.putString(TAB_DRAG_KEY); 
       dragboard.setContent(clipboardContent); 
       draggingTab.set(pane); 
       event.consume(); 
      } 
     }); 
    } 
    TitledPane pane=new TitledPane("MAIN",vbox); 
    primaryStage.setScene(new Scene(pane, 890, 570)); 
    primaryStage.show(); 
}