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  1. JDK
  2. JDK-8116841

AnchorPane doesn't fully respect min size of it's children in certain cases

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      Description

      Minimum size is not used properly in layout, but it is in rendering. The result is that parent bounds appear to be miscalculated.

      Try the following:


      package layoutbounds;

      import javafx.application.Application;
      import javafx.event.EventHandler;
      import javafx.geometry.Bounds;
      import javafx.geometry.Point2D;
      import javafx.geometry.Pos;
      import javafx.scene.Scene;
      import javafx.scene.control.Label;
      import javafx.scene.input.MouseEvent;
      import javafx.scene.layout.AnchorPane;
      import javafx.scene.layout.BorderPane;
      import javafx.scene.layout.HBox;
      import javafx.scene.layout.Priority;
      import javafx.scene.layout.StackPane;
      import javafx.scene.layout.VBox;
      import javafx.scene.paint.Color;
      import javafx.scene.shape.Rectangle;
      import javafx.stage.Stage;

      /**
       * Resize the child by dragging the green square. JavaFX 2.2 and JavaFX 8
       * behave very differently.
       * @author scott.palmer
       */
      public class LayoutBounds extends Application {

          static class Widget extends AnchorPane {

              private final VBox vbox;
              private final BorderPane contentPane;
              private final AnchorPane contentStack;
              private final StackPane contentWrapper;
              private final AnchorPane childrenGroup;
              private final AnchorPane connectionGroup;
              private final HBox bottomPane;

              public Widget(String title) {
                  vbox = new VBox();
                  vbox.setFillWidth(true);
                  vbox.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
                  AnchorPane.setTopAnchor(vbox, 0.0);
                  AnchorPane.setRightAnchor(vbox, 0.0);
                  AnchorPane.setBottomAnchor(vbox, 0.0);
                  AnchorPane.setLeftAnchor(vbox, 0.0);
                  getChildren().add(vbox);

                  Label titleBar = new Label(title);
                  titleBar.setAlignment(Pos.CENTER);
                  titleBar.setMaxWidth(Double.MAX_VALUE);
                  titleBar.setTextFill(Color.WHITE);
                  titleBar.setStyle("-fx-background-color: BLUE;");
                  vbox.getChildren().add(titleBar);

                  contentStack = new AnchorPane();
                  contentWrapper = new StackPane();

                  bottomPane = new HBox();
                  bottomPane.getChildren().add(new Label("resize->"));
                  
                  contentPane = new BorderPane();
                  contentPane.setBottom(bottomPane);
                  contentPane.setPickOnBounds(false);

                  childrenGroup = new AnchorPane();
                  contentWrapper.getChildren().add(childrenGroup);
                  contentPane.setCenter(contentWrapper);

                  connectionGroup = new AnchorPane();

                  AnchorPane.setTopAnchor(contentPane, 0.0);
                  AnchorPane.setRightAnchor(contentPane, 0.0);
                  AnchorPane.setBottomAnchor(contentPane, 0.0);
                  AnchorPane.setLeftAnchor(contentPane, 0.0);

                  contentStack.getChildren().add(connectionGroup);
                  contentStack.getChildren().add(contentPane);
                  contentStack.setMaxHeight(Double.MAX_VALUE);
                  VBox.setVgrow(contentStack, Priority.ALWAYS);
                  vbox.getChildren().add(contentStack);

                  Rectangle sizer = new Rectangle(16, 16);
                  sizer.setFill(Color.GREENYELLOW);
                  AnchorPane.setRightAnchor(sizer, 0.0);
                  AnchorPane.setBottomAnchor(sizer, 0.0);
                  getChildren().add(sizer);
                  
                  sizer.setOnMouseDragged(resizeDragHandler);
                  setStyle("-fx-background-color: SKYBLUE; -fx-border-color: YELLOW; -fx-border-width: 3px;");
              }

              void addComponent(Widget child) {
                  childrenGroup.getChildren().add(child);
              }

              private EventHandler<MouseEvent> resizeDragHandler = new EventHandler<MouseEvent>() {
                  @Override
                  public void handle(MouseEvent me) {
                      Point2D dragPoint = Widget.this.sceneToLocal(new Point2D(me.getSceneX(), me.getSceneY()));
                      sizeToPoint(dragPoint);
                      me.consume();
                  }
              };
              private void sizeToPoint(Point2D dragPoint) {
                  Bounds bounds = getBoundsInLocal();
                  setMinSize(Math.max(0, dragPoint.getX()-bounds.getMinX()),
                             Math.max(0, dragPoint.getY()-bounds.getMinY()));
              }
          }
          
          @Override
          public void start(Stage primaryStage) {
              Widget rectA = new Widget("Parent");
              Widget rectB = new Widget("Child");
              rectA.addComponent(rectB);
              AnchorPane root = new AnchorPane();
              root.getChildren().add(rectA);
              Scene scene = new Scene(root, 400, 300);
              primaryStage.setTitle("Layout Bounds Issues");
              primaryStage.setScene(scene);
              primaryStage.show();
          }

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

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            • Assignee:
              msladecek Martin Sládeček
              Reporter:
              swpalmer Scott Palmer
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              • Created:
                Updated:
                Resolved:
                Imported: