java - How to execute code during a drag and drop operation? -

i have node want implement drag , drop (this object source not target). want object move along mouse cursor. managed both of these not @ same time.

it appears setondragdetected , setonmousedragged don't work together. consider node following handlers:

import javafx.application.application; import javafx.scene.group; import javafx.scene.scene; import javafx.scene.input.clipboardcontent; import javafx.scene.input.dragboard; import javafx.scene.input.transfermode; import javafx.scene.shape.rectangle; import javafx.stage.stage;  public class example extends application {      @override     public void start(stage primarystage) throws exception {          rectangle rect = new rectangle(20, 20);         rect.setonmousepressed(e -> system.out.println("pressed"));         rect.setonmousedragged(e -> system.out.println("dragged"));         rect.setondragdetected(e -> {             system.out.println("detected");             clipboardcontent content = new clipboardcontent();             content.putstring("something");             dragboard db = rect.startdraganddrop(transfermode.any);             db.setcontent(content);         });         group subgroup = new group(rect);          scene scene = new scene(subgroup, 100, 100);         primarystage.setscene(scene);         primarystage.show();     }      public static void main(string[] args) {          example.launch(args);     } } 

now press mouse on node , move mouse. output:

pressed dragged dragged dragged dragged dragged dragged detected 

once drag detected mousedragged handler stops.

how achieve described? 1 thing noticed maybe can use ondragover parent want behavior in node because that's should be.

you mixing 2 things here. in short, when call startdraganddrop method system switches drag , drop mode , java stops delivering mouseevent rect.

the mouseevent documentation has section "dragging gestures" explains 3 types of dragging gestures. here short summary:

• simple press-drag-release - when drag detected java continues deliver mouseevents node drag detected.
• full press-drag-release - can call startfulldrag inside handler set setondragdetected. java starts deliver mousedragevents other nodes (potential gesture targets).
• platform-supported drag-and-drop - if call startdraganddrop inside ondragdetected handler, java stop deliver mouseevents , start deliver dragevents instead. used drag , drop interaction other applications.

it not clear me want achieve, long not want drag outside of application, try using startfulldrag instead.

also, might helpful have further @ dragevent , mousedragevent documentation.