InternalWindow.groovy

import javafx.beans.property.ObjectProperty
import javafx.beans.property.SimpleObjectProperty
import javafx.beans.value.ChangeListener
import javafx.scene.Node
import javafx.scene.control.Control
import javafx.scene.control.Skin
import javafx.scene.layout.StackPane

import com.sun.javafx.scene.control.behavior.BehaviorBase
import com.sun.javafx.scene.control.behavior.KeyBinding
import com.sun.javafx.scene.control.skin.BehaviorSkinBase

// def window = new InternalWindow()
// window.content = new Label("hello")
// panel.children << window

class InternalWindow extends Control {

    //---------------------------------------------------------------------------------------------
    // CONSTANTS.
    //---------------------------------------------------------------------------------------------

    private static final String DEFAULT_STYLE_CLASS = "internal-window"

    //---------------------------------------------------------------------------------------------
    // CONSTRUCTORS.
    //---------------------------------------------------------------------------------------------

    public InternalWindow() {
        this.styleClass.add(DEFAULT_STYLE_CLASS)
    }

    //---------------------------------------------------------------------------------------------
    // PROPERTIES.
    //---------------------------------------------------------------------------------------------

    private ObjectProperty<Node> contentProperty = new SimpleObjectProperty<Node>()

    ObjectProperty<Node> contentProperty() { return this.contentProperty }

    Node getContent() { return this.contentProperty.get() }

    void setContent(Node node) { this.contentProperty.set(node) }

    //---------------------------------------------------------------------------------------------
    // PROTECTED METHODS.
    //---------------------------------------------------------------------------------------------

    protected Skin<InternalWindow> createDefaultSkin() {
        return new InternalWindowSkin(this, new InternalWindowBehavior(this))
    }

}

class InternalWindowSkin extends BehaviorSkinBase<InternalWindow, InternalWindowBehavior> {

    //---------------------------------------------------------------------------------------------
    // PRIVATE FIELDS.
    //---------------------------------------------------------------------------------------------

    private final StackPane content = new StackPane()

    //---------------------------------------------------------------------------------------------
    // CONSTRUCTORS.
    //---------------------------------------------------------------------------------------------

    public InternalWindowSkin(InternalWindow control, InternalWindowBehavior behavior) {
        super(control, behavior)
        this.children.add(this.content)
        this.skinnable.contentProperty().addListener({
            println "control content property changed: " + this.skinnable.content
            this.content.children.setAll(this.skinnable.content)
        } as ChangeListener<Node>)
        this.content.children.setAll(this.skinnable.content)
    }

    //---------------------------------------------------------------------------------------------
    // PROTECTED METHODS.
    //---------------------------------------------------------------------------------------------

    protected void handleControlPropertyChanged(String propertyReference) {
        super.handleControlPropertyChanged(propertyReference)
        println "control property changed: " + propertyReference
    }

    protected void layoutChildren(double x, double y, double w, double h) {
        this.content.resizeRelocate(x, y, w, h)
    }

}

class InternalWindowBehavior extends BehaviorBase<InternalWindow> {

    //---------------------------------------------------------------------------------------------
    // CONSTRUCTORS.
    //---------------------------------------------------------------------------------------------

    public InternalWindowBehavior(InternalWindow control) {
        super(control, Collections.<KeyBinding>emptyList())
    }

}