Why stage Builder creates constantly new instances of nodes?

Hello

I thought I had a simple idea to create a control that would allow me to recover a part of the behavior of a component of the map. It's all of the control:

import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.layout.StackPane;


public class Card extends StackPane {
    private final BooleanProperty active = new SimpleBooleanProperty();
    public final BooleanProperty activeProperty() {return active;}
    public final boolean isActive() {return active.get();}
    public final void setActive(boolean active) {this.active.set(active);}


    {
        visibleProperty().bind(active);
        managedProperty().bind(active);


        active.addListener(new ChangeListener<Boolean>() {
            @Override
            public void changed(ObservableValue<? extends Boolean> observable,
                                Boolean old,
                                Boolean active) {
                System.out.println(toString() + " active changed to: " + active);
                if(active) {
                    Parent parent = getParent();
                    if(parent != null) {
                        System.out.println("Parent is: " + parent.toString());
                        parent.getChildrenUnmodifiable().forEach(Card.this::deactivateIfCard);
                    }
                    else {
                        System.out.println("Parent is null.");
                    }
                }
            }
        });
    }


    private void deactivateIfCard(Node node) {
        if(node != this && node instanceof Card) {
            Card card = (Card) node;
            card.setActive(false);
        }
    }
}

The idea is simple enough; expand StackPane, add an active property, bind the visible and managed component properties to the property active, and, whenever the active property is changed to true, browse the sibling nodes by disabling brothers and sisters who are also the type of card.

However, this does not work with the generator from the scene. While trying to debug, I created an ExtStackPane:

import javafx.collections.ListChangeListener;
import javafx.scene.Node;
import javafx.scene.layout.StackPane;


public class ExtStackPane extends StackPane {
    {
        getChildren().addListener((ListChangeListener<Node>) c -> {
            System.out.println("ExtStackPane children change: " + c.toString());
        });
    }
}

It doesn't save that list change events. However, I was very surprised by the exit when you work in the generator from the scene. I added both controls the generator onstage and did the following:

0) added an ExtStackPane

(1) added a map to the ExtStackPane

2) added another card at the ExtStackPane

(3) adds a label the first card

(4) added a label to the second card

5) changed the text of the first label Hello

6) changed the text of the label of second in the world

(7) set the first card to active

(8) the value of the second card active

I get the following result:

1)
ExtStackPane children change: { [Card@5b9067b3] added at 0 }


2)
ExtStackPane children change: { [Card@6b6328bd] added at 0 }
ExtStackPane children change: { [Card@6aca8cc5] added at 1 }


3)
ExtStackPane children change: { [Card@3b7bc340] added at 0 }
ExtStackPane children change: { [Card@1879819e] added at 1 }


4)
ExtStackPane children change: { [Card@60ffed67] added at 0 }
ExtStackPane children change: { [Card@64955a14] added at 1 }


5)
ExtStackPane children change: { [Card@5dc96bc4] added at 0 }
ExtStackPane children change: { [Card@40667c26] added at 1 }


6)
ExtStackPane children change: { [Card@164770fa] added at 0 }
ExtStackPane children change: { [Card@7decebbf] added at 1 }


7)
Card$1@f4f4850 active changed to: true
Parent is null.
ExtStackPane children change: { [Card@27442c8b] added at 0 }
ExtStackPane children change: { [Card@643d810e] added at 1 }


8)
Card$1@4877c67b active changed to: true
Parent is null.
ExtStackPane children change: { [Card@7e8a473e] added at 0 }
Card$1@2b4497c1 active changed to: true
Parent is null.
ExtStackPane children change: { [Card@5df6c8cc] added at 1 }

This is what things look like in the generator from the scene:

The scene generator recreate the entire hierarchy whenever I make a small change? Here's an app that does the same thing as the manual steps that I performed in the stage Builder:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;


public class CardApplication extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        ExtStackPane stackPane = new ExtStackPane();


        // 1
        Card card1 = new Card();
        stackPane.getChildren().add(card1);


        // 2
        Card card2 = new Card();
        stackPane.getChildren().add(card2);


        // 3
        Label label1 = new Label();
        card1.getChildren().add(label1);


        // 4
        Label label2 = new Label();
        card2.getChildren().add(label2);


        // 5
        label1.setText("Hello");


        // 6
        label2.setText("World");




        primaryStage.setScene(new Scene(stackPane));
        primaryStage.setTitle("Card Application");
        primaryStage.setWidth(600);
        primaryStage.setHeight(400);
        primaryStage.show();


        // 7
        card1.setActive(true);


        // 8
        card2.setActive(true);
    }
}

The output when executing the above is:

1)
ExtStackPane children change: { [Card@6dfaa767] added at 0 }


2)
ExtStackPane children change: { [Card@6aa2c411] added at 1 }


7)
Card$1@1abf7511 active changed to: true
Parent is: ExtStackPane@41993867[styleClass=root]


8)
Card$1@5733cd2 active changed to: true
Parent is: ExtStackPane@41993867[styleClass=root]
Card$1@1abf7511 active changed to: false

The behavior is obviously very different than when I work with control in the generator from the scene. Can someone explain to me that event giving rise to the stage to change the behavior of my map control so much? My map control breaks some I'm not aware of one or more rules?

I think you're confused about what makes SceneBuilder.

SceneBuilder is a design tool, used by the programmer (not the end user) to generate the part of the code that is used to run the application. (Specifically, it generates the FXML code which is analysed by the FXMLLoader to create and configure objects that are usually part of the graphic scene.)

When you use SceneBuilder to create the code, it generates a model of what the user interface will look like, if the generated FXML should be loaded and displayed. This model is not meant to be an identical vision of what will be the end user, but a help to you, the programmer, to generate the code that you want to.

So, for example your accordion/TitledPane in the layout of the poster than SceneBuilder, the * selected * titled pane is always expanded. This allows you to drag and drop objects inside and set it up in other ways. If you clear the checkbox "extended" in the properties pane, then it remains extended in the model so that you can continue to configure it. However, this property is not ignored: the State of these boxes is respected in the FXML file that is generated. So when you click on 'save' in SceneBuilder, the fxml generated will contain TitledPane extended element = "true" If the box is checked and expanded = "false" If the check box is cleared. (SceneBuilder will of course also applied the rule that only TitledPane in the accordion can be increased.)

Similarly, for your control customized, you should be able to implement and SceneBuilder displays the 'active' property in the box. If you disable this property, if active = false, which will be respected in the fxml and when you run the active application will be set to false and so by your liaison, visible is set to false and the component is not displayed. But the comp in (of course) SceneBuilder always displays your component, because it would be extremely difficult for you to configure a component that did not appear in the programming tool.

In fact, there is no real reason for SceneBuilder create all the objects that you set up at all. He could just trying to figure out what they look like and render a representation of them on a canvas, for example. It's probably much (much) harder than instantiating them and the authors of SceneBuilder apparently chose to write SceneBuilder in a way that re-instantiates the controls several times. But this has absolutely nothing to do with what happens when you run the application and it is no logic at all to compare the two.

Tags: Java

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