Curious behavior on initialization of the property

Creating a custom component I stumbled upon a question that I did not quite understand. Trying to understand with an example from Hello world, I got more confused...

Definition of a control with a simple text property, CSS file defining the skin and the implementation of the skin. I tried to put a listener of changes on my control's text property in the constructor of the skin.

When you create a sample test to create a control and by then setting the text, I was expecting the changes listener to be called. More importantly, when to print the value of the property, it still shows the initial empty string even though its value has clearly changed.

I use Java 8 on Linux Mint Debian Edition.

Here is the control itself:

package javafxtest.label;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.scene.control.Control;

public class MyLabel extends Control {
    private final StringProperty text = new SimpleStringProperty(this, "text", "");
    
    public MyLabel() {
       this.getStyleClass().add(this.getClass().getSimpleName());

    }
    @Override
    protected String getUserAgentStylesheet() {
        return getClass().getResource("/javafxtest/label/"+getClass().getSimpleName()+".css").toExternalForm();
    }

    public String getText() {
        return text.get();
    }

    public void setText(String value) {
        text.set(value);
    }

    public StringProperty textProperty() {
        return text;
    }
}

The CSS file:

.MyLabel {
    -fx-skin: "javafxtest.label.MyLabelSkin";
}

Skin:

package javafxtest.label;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.control.Label;
import javafx.scene.control.SkinBase;

public class MyLabelSkin extends SkinBase<MyLabel> {
    
    private final Label label;

    public MyLabelSkin(MyLabel c) {
        super(c);
        label = new Label();
        c.textProperty().bind(label.textProperty());
        c.textProperty().addListener(new ChangeListener<String>(){

            @Override
            public void changed(ObservableValue<? extends String> ov, String t, String t1) {
                System.out.println("Value changed");
            }
        });
        System.out.println("Text value of the control: "+c.getText());
    }
}

And finally the test application:

package javafxtest.label;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class LabelInitialisationTest3 extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        MyLabel lbl = new MyLabel();
        lbl.setText("Hello World");
        
        StackPane root = new StackPane();
        root.getChildren().add(lbl);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

My first thought (only having a problem with the listener changes not beeing called), I thought that this is an initialization problem, as the skin only get instantiated when the scene is rendered for the first time, but this isn't so. Now, I think I am missing something completely obvious, as the correct use of the property of type string.

Someone at - it an idea?

First thing is earlier as suspeced. The initialization of the skin happens only when the scene is shown:

at javafxtest.label.MyLabelSkin.(MyLabelSkin.java:24)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:414)
at javafx.scene.control.Control.loadSkinClass(Control.java:714)
at javafx.scene.control.Control$5.invalidated(Control.java:651)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:109)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:143)
at javafx.css.StyleableStringProperty.set(StyleableStringProperty.java:83)
at javafx.scene.control.Control$5.set(Control.java:640)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:69)
at javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:45)
at javafx.scene.CssStyleHelper.transitionToState(CssStyleHelper.java:618)
at javafx.scene.Node.impl_processCSS(Node.java:8638)
at javafx.scene.Parent.impl_processCSS(Parent.java:1192)
at javafx.scene.control.Control.impl_processCSS(Control.java:863)
at javafx.scene.Parent.impl_processCSS(Parent.java:1204)
at javafx.scene.Node.processCSS(Node.java:8548)
at javafx.scene.Scene.doCSSPass(Scene.java:545)
at javafx.scene.Scene.preferredSize(Scene.java:1583)
at javafx.scene.Scene.impl_preferredSize(Scene.java:1650)
at javafx.stage.Window$9.invalidated(Window.java:730)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:143)
at javafx.stage.Window.setShowing(Window.java:796)
at javafx.stage.Window.show(Window.java:811)
at javafx.stage.Stage.show(Stage.java:243)
at javafxtest.label.LabelInitialisationTest3.start(LabelInitialisationTest3.java:38)
at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:810)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:273)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:239)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:236)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:236)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.access$200(GtkApplication.java:47)
at com.sun.glass.ui.gtk.GtkApplication$5$1.run(GtkApplication.java:137)
at java.lang.Thread.run(Thread.java:724)

Of course, this means that to get the original value of the control in the text of labels property change listener will not be triggered. Instead, the value must be set by hand.

The second question was an oversight on my part: what to appear, the label must be added to the list of children in the skin:

public MyLabelSkin(MyLabel c) {
    super(c);
    label = new Label();
    label.textProperty().set(c.getText());
    c.textProperty().bind(label.textProperty());
    c.textProperty().addListener(new ChangeListener(){

        @Override
        public void changed(ObservableValue ov, String t, String t1) {
            System.out.println("Value changed Skin");
        }
    });
    System.out.println("Text value of the control: "+c.textProperty().getValue());
    System.out.println("Text value of the label: "+label.textProperty().getValue());

    getChildren().add(label);
}

Tags: Java

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