Label bounds bigger than they really are

Question

I have a question regarding the calculation of the bounds of labels and how they are used to take up space in a parent.
In my example, i have an application where the top element is a border pane. In the left part of the borderpane i have a VBox with a specified maxWidth (in this case, 250). The last element of the VBox is another VBox to display a label (a headline) and a GridPane. In this GridPane i have several other labels. Consider this picture:
pic1
This is how it should look like (i enabled gridLinesVisible for sake of demonstration).
When i use a Text instead of a label in the right column, i get this:
pic2
Since the Text in the second row exceeds the maxWidth of the top VBox but cannot be made smaller, the VBox grows in width. Everything ok here.
But when i use a label, i expect the label to respect the maxWidth of the top VBox. Altough it seems that it does this, see the result:
pic3
The label cuts the text at the correct place and the grid column is not larger than the needed space, but still the VBox width grew.
Is this a bug or am i doing something wrong? When i set the ColumnConstraints of the GridPane to a value, i get the result of the first picture. But this workaround isn't practicable since it's a hazzle to find out the right amount of pixels and what i really want is the label to fill the remaining space it has available from the top VBox.

Answer 1

jsmith wrote:
Should i write a minimal example for reproducing this issueYes.Main.java:
package labelboundsissue;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Pos;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Line;
import javafx.stage.Stage;
import java.net.URL;
public class Main extends Application {
  public static void main(String[] args) {
    launch(args);
  @Override
  public void start(Stage primaryStage) throws Exception {
    BorderPane pane = new BorderPane();
    StackPane center = new StackPane();
    center.setAlignment(Pos.CENTER_LEFT);
    Label someLabel = new Label("  Label Bounds Issue Test");
    Line line = new Line(0,0,0,500);
    center.getChildren().addAll(line, someLabel);
    pane.setCenter(center);
    FXMLLoader loader = new FXMLLoader();
    URL resource = getClass().getResource("left.fxml");
    loader.setLocation(resource);
    Parent  left = (Parent) loader.load();
    pane.setLeft(left);
    Scene scene = new Scene(pane, 800, 500);
    primaryStage.setScene(scene);
    primaryStage.show();
}left.fxml:
<?xml version="1.0" encoding="utf-8"?>
<?import java.lang.*?>
<?import java.net.URL?>
<?import javafx.scene.shape.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.paint.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.image.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.text.*?>
<?import javafx.scene.web.*?>
<?import javafx.scene.*?>
<VBox maxWidth="200">
  <GridPane gridLinesVisible="true" hgap="5">
    <columnConstraints>
      <ColumnConstraints hgrow="NEVER"/>
      <ColumnConstraints hgrow="NEVER"/> <!-- comment this -->
      <!--<ColumnConstraints hgrow="NEVER" maxWidth="155"/>--> <!-- uncomment this -->
    </columnConstraints>
    <Text GridPane.columnIndex="0" GridPane.rowIndex="0" text="Name:"/>
    <Label GridPane.columnIndex="1" GridPane.rowIndex="0" text="Karl Theodor Maria Nikolaus Johann Jacob Philipp Franz Joseph Sylvester Freiherr von und zu Guttenberg" />
  </GridPane>
</VBox>When starting the application you can see vast amount of space between the end of the label and the left border of the border pane, altough it should be limited by the VBox' maxWidth.
Adjusting the maxWidth of the Column solves it.