Internal Frames in JavaFX

Question

I found this example of Internal Frames

http://docs.oracle.com/javase/tutorial/uiswing/components/internalframe.html

Is it possible to make the same internal

Answer 1

You can implement simple internal window themselves. Main idea, that InternalWindow class just skeleton, that has internal frame like functionality. You can apply any content to it.

1) Declare class

public class InternalWindow extends Region

2) You should be able to set content in window

public void setRoot(Node node) {
        getChildren().add(node);
}

3) You should be able to bring window to front if many window exist

public void makeFocusable() {    
        this.setOnMouseClicked(mouseEvent -> {
            toFront();
        });    
}

4) Now we need dragging functionality

//just for encapsulation
private static class Delta {
    double x, y;
}

//we can select nodes that react drag event
public void makeDragable(Node what) {
    final Delta dragDelta = new Delta();
    what.setOnMousePressed(mouseEvent -> {
        dragDelta.x = getLayoutX() - mouseEvent.getScreenX();
        dragDelta.y = getLayoutY() - mouseEvent.getScreenY();
        //also bring to front when moving
        toFront();
    });
    what.setOnMouseDragged(mouseEvent -> {
        setLayoutX(mouseEvent.getScreenX() + dragDelta.x);
        setLayoutY(mouseEvent.getScreenY() + dragDelta.y);
    });
}

5) Also we want able to resize window (I show only simple right-bottom resizing)

//current state
private boolean RESIZE_BOTTOM;
private boolean RESIZE_RIGHT;

public void makeResizable(double mouseBorderWidth) {
    this.setOnMouseMoved(mouseEvent -> {
        //local window's coordiantes
        double mouseX = mouseEvent.getX();
        double mouseY = mouseEvent.getY();
        //window size
        double width = this.boundsInLocalProperty().get().getWidth();
        double height = this.boundsInLocalProperty().get().getHeight();
        //if we on the edge, change state and cursor
        if (Math.abs(mouseX - width) < mouseBorderWidth
                && Math.abs(mouseY - height) < mouseBorderWidth) {
            RESIZE_RIGHT = true;
            RESIZE_BOTTOM = true;
            this.setCursor(Cursor.NW_RESIZE);
        } else {
            RESIZE_BOTTOM = false;
            RESIZE_RIGHT = false;
            this.setCursor(Cursor.DEFAULT);
        }

    });
    this.setOnMouseDragged(mouseEvent -> {
        //resize root
        Region region = (Region) getChildren().get(0);
        //resize logic depends on state
        if (RESIZE_BOTTOM && RESIZE_RIGHT) {
            region.setPrefSize(mouseEvent.getX(), mouseEvent.getY());
        } else if (RESIZE_RIGHT) {
            region.setPrefWidth(mouseEvent.getX());
        } else if (RESIZE_BOTTOM) {
            region.setPrefHeight(mouseEvent.getY());
        }
    });
}

6) Usage. First we construct all layout. Then apply it to InternalWindow.

private InternalWindow constructWindow() {
    // content
    ImageView imageView = new ImageView("https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Cheetah4.jpg/250px-Cheetah4.jpg");
    // title bar
    BorderPane titleBar = new BorderPane();
    titleBar.setStyle("-fx-background-color: green; -fx-padding: 3");
    Label label = new Label("header");
    titleBar.setLeft(label);
    Button closeButton = new Button("x");
    titleBar.setRight(closeButton);
    // title bat + content
    BorderPane windowPane = new BorderPane();
    windowPane.setStyle("-fx-border-width: 1; -fx-border-color: black");
    windowPane.setTop(titleBar);
    windowPane.setCenter(imageView);

    //apply layout to InternalWindow
    InternalWindow interalWindow = new InternalWindow();
    interalWindow.setRoot(windowPane);
    //drag only by title
    interalWindow.makeDragable(titleBar);
    interalWindow.makeDragable(label);
    interalWindow.makeResizable(20);
    interalWindow.makeFocusable();
    return interalWindow;
}

7) And how add window to layout

@Override
public void start(Stage primaryStage) throws Exception {
    Pane root = new Pane();
    root.getChildren().add(constructWindow());
    root.getChildren().add(constructWindow());
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();
}

Result

Full code: gist

Upd about close button:

You can add method to InternalWindow

public void setCloseButton(Button btn) {
    btn.setOnAction(event -> ((Pane) getParent()).getChildren().remove(this));
}

And when construct:

interalWindow.setCloseButton(closeButton);