javaFX鼠标事件过滤器

Question

i trying to make a mouse event filter but its not working ,the consume() method is supposed to prevent the event from happenning and the label to stop showing the cursor location wheen exceed 200 units , but it keep showing it , any solution guys ?

    package javafxapplication1;
    import javafx.application.Application;
    import javafx.event.EventHandler;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.input.MouseEvent;
    import javafx.scene.input.KeyEvent;
    import javafx.scene.control.Label;
    import javafx.scene.input.MouseEvent;
    import javafx.scene.layout.FlowPane;
    import javafx.stage.Stage;

    /**
     *
     * @author Nadjib
     */
    public class nadjib extends Application {

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

        @Override
        public void start(Stage primaryStage) throws Exception {
            primaryStage.setTitle(" hello  ! ");
            FlowPane flowflow = new FlowPane();
            Scene scene = new Scene(flowflow,500,500);
            Label label = new Label("label man ");




           scene.addEventFilter(MouseEvent.MOUSE_MOVED,new 
          EventHandler<MouseEvent>(){ 

                @Override
                public void handle(MouseEvent event) {
                     label.setText("position x = : " + event.getScreenX() 
                 + " positoon y = " + event.getScreenY() );
                     if(event.getScreenX() > 200 ) event.consume();


                }
            });

            flowflow.getChildren().add(label);
            primaryStage.setScene(scene);
            primaryStage.show();
        }


    }

Answer 1

First of all, you're checking the value of screenX after updating the Label . So of course the Label will continue to update.

That being said, in the code you posted, there's no need to consume the event at all. Simply do nothing if the event.getScreenX() > 200 .

The simplest way to do this is with a simple if/then block:

scene.addEventFilter(MouseEvent.MOUSE_MOVED, event -> {
    if (event.getScreenX() > 200) {
        return; // Do nothing
    } else {
        label.setText("position x = : " + event.getScreenX() + " positoon y = " + event.getScreenY());
    }
});

If this doesn't solve your issue, please edit your question and explain exactly what you're trying to accomplish. Right now, this will prevent the cursor locations from updating once X > 200 .