Javafx 2 click and double click

I would like to know if it was possible to detect the double-click in JavaFX 2 ? and how ?

I would like to make different event between a click and a double click.

Thanks

---

Yes you can detect single, double even multiple clicks:

myNode.setOnMouseClicked(new EventHandler<MouseEvent>() {
    @Override
    public void handle(MouseEvent mouseEvent) {
        if(mouseEvent.getButton().equals(MouseButton.PRIMARY)){
            if(mouseEvent.getClickCount() == 2){
                System.out.println("Double clicked");
            }
        }
    }
});

MouseButton.PRIMARY is used to determine if the left (commonly) mouse button is triggered the event. Read the api of getClickCount() to conclude that there maybe multiple click counts other than single or double. However I find it hard to distinguish between single and double click events. Because the first click count of the double click will rise a single event as well.

---

Does not work if you want to handle one click AND double clicks by adding

if(mouseEvent.getClickCount() == 2) 
{ 
  System.out.println("Doubleclicked"); 
} 
else if(mouseEvent.getClickCount() == 1)
{   
  System.out.println("Single clicked"); 
}

Results in: "Single clicked" is always fired.

---

如果您必须区分单击和双击，并且必须采取特定操作，则可以使用另一段代码。

import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class DoubleClickDetectionTest extends Application {

    boolean dragFlag = false;

    int clickCounter = 0;

    ScheduledThreadPoolExecutor executor;

    ScheduledFuture<?> scheduledFuture;

    public DoubleClickDetectionTest() {
        executor = new ScheduledThreadPoolExecutor(1);
        executor.setRemoveOnCancelPolicy(true);
    }

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        StackPane root = new StackPane();

        primaryStage.setScene(new Scene(root, 400, 400));
        primaryStage.show();

        root.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent e) {
                if (e.getButton().equals(MouseButton.PRIMARY)) {
                    dragFlag = true;
                }
            }
        });

        root.setOnMouseClicked(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent e) {
                if (e.getButton().equals(MouseButton.PRIMARY)) {
                    if (!dragFlag) {
                        System.out.println(++clickCounter + " " + e.getClickCount());
                        if (e.getClickCount() == 1) {
                            scheduledFuture = executor.schedule(() -> singleClickAction(), 500, TimeUnit.MILLISECONDS);
                        } else if (e.getClickCount() > 1) {
                            if (scheduledFuture != null && !scheduledFuture.isCancelled() && !scheduledFuture.isDone()) {
                                scheduledFuture.cancel(false);
                                doubleClickAction();
                            }
                        }
                    }
                    dragFlag = false;
                }
            }
        });
    }

    @Override
    public void stop() {
        executor.shutdown();
    }

    private void singleClickAction() {
        System.out.println("Single-click action executed.");
    }

    private void doubleClickAction() {
        System.out.println("Double-click action executed.");
    }
}

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