How to change or override the tooltip in JavaFX ColorPicker

Question

I am using JavaFX ColorPicker in my application. As per my requirements, I have mapped the default colors on the color picker to a number. I want this number to be displaye

Answer 1

This is really a hacky answer.

The first problem: you have to find the popup node on the scene once it shows up. But you won't... since its not in the same window!

Having a deep look at how ScenicView does it, the trick is getting the list of windows at that moment, but using a deprectated method:

private PopupWindow getPopupWindow() {
    @SuppressWarnings("deprecation") final Iterator<Window> windows = Window.impl_getWindows();
    while (windows.hasNext()) {
        final Window window = windows.next();
        if (window instanceof PopupWindow) {
            return (PopupWindow)window;
        }
    }
    return null;
}

Once you have the popup window, we can now check for all the Rectangle nodes using lookupAll and the CSS selector color-rect, to get their color, and install the tooltip over its parent container:

@Override
public void start(Stage primaryStage) {
    ColorPicker picker = new ColorPicker();
    StackPane root = new StackPane(picker);

    Scene scene = new Scene(root, 500, 400);

    primaryStage.setScene(scene);
    primaryStage.show();
    picker.showingProperty().addListener((obs,b,b1)->{
        if(b1){
            PopupWindow popupWindow = getPopupWindow();
            Node popup = popupWindow.getScene().getRoot().getChildrenUnmodifiable().get(0);
            popup.lookupAll(".color-rect").stream()
                .forEach(rect->{
                    Color c = (Color)((Rectangle)rect).getFill();
                    Tooltip.install(rect.getParent(), new Tooltip("Custom tip for "+c.toString()));
                });
        }
    });
}

This is what it looks like:

Answer 2

Based on the code posted by the OP after my first answer, and due to the substancial changes in the problem addressed, I'm adding a new answer that covers both situations:

• The ColorPicker is embedded in the main scene, as a regular node
• The ColorPicker is embedded in a ContextMenu

In the second situation, the proposed solution for the first one is no longer valid, since the window found will be the one with the context menu.

A task is required to keep looking for windows until the one with the ComboBoxPopupControl is found.

This is a full runnable example:

public class ColorPickerFinder extends Application {

    ExecutorService findWindowExecutor = createExecutor("FindWindow");

    @Override
    public void start(Stage primaryStage) {

        AnchorPane panCircles = new AnchorPane();
        Scene scene = new Scene(panCircles, 400, 400);

        final Random random = new Random();
        IntStream.range(0,5).boxed().forEach(i->{
            final Circle circle= new Circle(20+random.nextInt(80), 
                Color.rgb(random.nextInt(255),random.nextInt(255),random.nextInt(255)));
            circle.setTranslateX(100+random.nextInt(200));
            circle.setTranslateY(100+random.nextInt(200));
            panCircles.getChildren().add(circle);
        });
        panCircles.setPrefSize(400, 400);
        ColorPicker colorPicker = new ColorPicker();

        panCircles.getChildren().add(colorPicker);
        primaryStage.setScene(scene);
        primaryStage.show();

        // We add listeners AFTER showing the stage, as we are looking for nodes 
        // by css selectors, these will be available only after the stage is shown
        colorPicker.showingProperty().addListener((obs,b,b1)->{
            if(b1){
                // No need for task in this case
                getPopupWindow();
            }
        });

        panCircles.getChildren().stream()
                .filter(c->c instanceof Circle)
                .map(c->(Circle)c)
                .forEach(circle->{
            circle.setOnMouseClicked(e->{
                if(e.getButton().equals(MouseButton.SECONDARY)){
                    // We need a task, since the first window found is the ContextMenu one
                    findWindowExecutor.execute(new WindowTask());

                    final ColorPicker picker = new ColorPicker();
                    picker.setStyle("-fx-border-radius: 10 10 10 10;" 
                                          + "-fx-background-radius: 10 10 10 10;");
                    picker.setValue((Color)(circle.getFill()));
                    picker.valueProperty().addListener((obs,c0,c1)->circle.setFill(c1));

                    final ContextMenu contextMenu = new ContextMenu();
                    MenuItem editLabel = new MenuItem();
                    contextMenu.getItems().add(editLabel);
                    editLabel.setGraphic(picker);
                    contextMenu.show(panCircles,e.getScreenX(),e.getScreenY());
                }
            });
        });

    }

    private PopupWindow getPopupWindow() {
        @SuppressWarnings("deprecation") 
        final Iterator<Window> windows = Window.impl_getWindows();

        while (windows.hasNext()) {
            final Window window = windows.next();
            if (window instanceof PopupWindow) {
                if(window.getScene()!=null && window.getScene().getRoot()!=null){ 
                    Parent root = window.getScene().getRoot();
                    if(root.getChildrenUnmodifiable().size()>0){
                        Node popup = root.getChildrenUnmodifiable().get(0);
                        if(popup.lookup(".combo-box-popup")!=null){

                            // only process ComboBoxPopupControl
                            Platform.runLater(()->{
                                popup.lookupAll(".color-rect").stream()
                                    .forEach(rect->{
                                        Color c = (Color)((Rectangle)rect).getFill();
                                        Tooltip.install(rect.getParent(), 
                                            new Tooltip("Custom tip for "+c.toString()));
                                    });
                            });
                            return (PopupWindow)window;
                        }
                    }
                }

                return null;
            }
        }
        return null;
    }

    private class WindowTask extends Task<Void> {

        @Override
        protected Void call() throws Exception {
            boolean found=false;
            while(!found){
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                }
                found=(getPopupWindow()!=null);
            }
            return null;
        }

    } 

    private ExecutorService createExecutor(final String name) {
        ThreadFactory factory = r -> {
            Thread t = new Thread(r);
            t.setName(name);
            t.setDaemon(true);
            return t;
        };
        return Executors.newSingleThreadExecutor(factory);
    }

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

}

This will be the result after right clicking on a circle, and clicking on the color picker: