how to differentiate between a single click or double click on a table row in javafx

Question

I am trying to create a table in javafx that allows a user to click on a row to go to one page or double click the row to go to a different page. The problem is that the applica

Answer 1

There's no way to do this that's part of the API: you just have to code "have the program wait and see if there is another click" yourself. Note that this means that the single-click action has to have a slight pause before it's executed; there's no way around this (your program can't know what's going to happen in the future). You might consider a different approach (e.g. left button versus right button) to avoid this slightly inconvenient user experience.

However, a solution could look something like this:

public class DoubleClickHandler {

    private final PauseTransition delay ;
    private final Runnable onSingleClick ;
    private final Runnable onDoubleClick ;
    private boolean alreadyClickedOnce ;

    public DoubleClickHandler(
        Duration maxTimeBetweenClicks,
        Runnable onSingleClick,
        Runnable onDoubleClick) {

        alreadyClickedOnce = false ;
        this.onSingleClick = onSingleClick ;
        this.onDoubleClick = onDoubleClick ;

        delay = new PauseTransition(maxTimeBetweenClicks);
        delay.setOnFinished(e -> {
            alreadyClickedOnce = false ;
            onSingleClick.run()
        });
    }

    public void applyToNode(Node node) {
        node.setOnMouseClicked(e -> {
            delay.stop();
            if (alreadyClickedOnce) {
                alreadyClickedOnce = false ;
                onDoubleClick.run();
            } else {
                alreadyClickedOnce = true ;
                delay.playFromStart();
            }
        });
    }
}

Which you can use with:

searchResults.setRowFactory(tv -> {
    TableRow row = new TableRow<>();
    DoubleClickHandler handler = new DoubleClickHandler(
        Duration.millis(500),
        () -> {
            MovieRow tempResult = row.getItem();
            System.out.println(tempResult.getMTitle + " was clicked once");
        },
        () -> {
            MovieRow tempResult = row.getItem();
            System.out.println(tempResult.getMTitle + " was clicked twice");
        }
    );
    handler.applyToNode(row);
    return row ;
});