JavaFX-BorderPane/StackPane在子级更改后不调整大小

Question

我看到下面的链接-https://stackoverflow.com/questions/5302197/javafx-bug-is-there-a-way-to-force-repaint-this-not-a-single-threading-pr调用requestLayout似乎没有帮助。我还尝试在图中的各个节点上调用impl_updatePG和impl_transformsChanged。我从这个线程得到了这个想法--https://forums.oracle.com/forums/thread.jspa？thread=2242083

public class BorderPaneExample extends Application
{
   private BorderPane root;
   private StackPane centerPane;

   @Override
   public void start(Stage primaryStage) throws Exception
   {
      root = new BorderPane();
      root.setTop(getMenu());
      root.setBottom(getBottomVBox());
      centerPane = getCenterPane();
      root.setCenter(centerPane);

      Scene scene = new Scene(root, 900, 500);
      primaryStage.setTitle("BorderPane Example");
      primaryStage.setScene(scene);
      primaryStage.show();
   }

   private MenuBar getMenu()
   {
      MenuBar menuBar = new MenuBar();

      MenuItem rightMenuItem = new MenuItem("Right");
      rightMenuItem.setOnAction(new EventHandler<ActionEvent>() {
         @Override
         public void handle(ActionEvent actionEvent) {
            root.setRight(getRightHBox());
            root.setBottom(null);
            root.requestLayout();
         }
      });
      MenuItem bottomMenuItem = new MenuItem("Bottom");
      bottomMenuItem.setOnAction(new EventHandler<ActionEvent>() {
         @Override
         public void handle(ActionEvent actionEvent) {
            root.setRight(null);
            root.setBottom(getBottomVBox());
         }
      });

      Menu menu = new Menu("Move text");
      menu.getItems().add(rightMenuItem);
      menu.getItems().add(bottomMenuItem);
      menuBar.getMenus().addAll(menu);

      return menuBar;
   }

   private HBox getRightHBox()
   {
      HBox hbox = new HBox();

      VBox vbox = new VBox(50);
      vbox.setPadding(new Insets(0, 20, 0, 20));
      vbox.setAlignment(Pos.CENTER);

      vbox.getChildren().addAll(new Text("Additional Info 1"),
        new Text("Additional Info 2"), new Text("Additional Info 3"));
      hbox.getChildren().addAll(new Separator(Orientation.VERTICAL), vbox); 

      return hbox;
   }

   private VBox getBottomVBox()
   {
      VBox vbox = new VBox();

      HBox hbox = new HBox(20);
      hbox.setPadding(new Insets(5));
      hbox.setAlignment(Pos.CENTER);

      hbox.getChildren().addAll(new Text("Footer Item 1")
            , new Text("Footer Item 2"), new Text("Footer Item 3"));
      vbox.getChildren().addAll(new Separator(), hbox);

      return vbox;
   }

   private StackPane getCenterPane()
   {
      StackPane stackPane = new StackPane();
      stackPane.setAlignment(Pos.CENTER);

      final Rectangle rec = new Rectangle(200, 200);
      rec.setFill(Color.DODGERBLUE);
      rec.widthProperty().bind(stackPane.widthProperty().subtract(50));
      rec.heightProperty().bind(stackPane.heightProperty().subtract(50));

      stackPane.getChildren().addAll(rec);

      return stackPane;
   }

   public static void main(String[] args)
   {
      Application.launch(args);
   }
}

如有任何建议，将不胜感激。谢谢

Answer 1

为了得到答案：

StackPane需要设置其最小大小才能进行裁剪。因此，如果您显式地将StackPane.setMinSize(0,0）；添加到GetCenterPane()方法中，它应该可以解决您的问题。

因此getCenterPane()方法现在将如下所示：

private StackPane getCenterPane()
{
  StackPane stackPane = new StackPane();
  stackPane.setMinSize(0, 0);
  stackPane.setAlignment(Pos.CENTER);

  final Rectangle rec = new Rectangle(200, 200);
  rec.setFill(Color.DODGERBLUE);
  rec.widthProperty().bind(stackPane.widthProperty().subtract(50));
  rec.heightProperty().bind(stackPane.heightProperty().subtract(50));

  stackPane.getChildren().addAll(rec);

  return stackPane;
}