ChangingCursor.java

package shop.examples;

import javafx.application.Application;
import javafx.beans.Observable;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;


public class ChangingCursor extends Application {

  Pane root;

  @Override
  public void start(Stage stage) {
    root = new Pane();
    root.setOnMousePressed (this::onMousePressed );
    root.setOnMouseReleased(this::onMouseReleased);
    root.setOnMouseEntered (this::onMouseEntered );
    root.setOnMouseExited  (this::onMouseExited  );
    root.cursorProperty().addListener(this::changedCursor);
    stage.setScene(new Scene(root, 300, 200));
    stage.show();
  }

  void onMousePressed (MouseEvent e) {
    System.out.println("pressed" );  root.setCursor(Cursor.CROSSHAIR);
  }
  void onMouseReleased(MouseEvent e) {
    System.out.println("released");  root.setCursor(Cursor.DEFAULT  );
  }
  void onMouseEntered (MouseEvent e) {
    System.out.println("entered" );  root.setCursor(Cursor.HAND     );
  }
  void onMouseExited  (MouseEvent e) {
    System.out.println("exited"  );
 // root.setCursor(Cursor.CLOSED_HAND); // has no effect
  }

  private void changedCursor(Observable ob, Cursor o, Cursor n) {
    System.out.println("changedCursor " + o + "  " + n);
  }

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

/* Behavior on macOS 11.5.2 JavaFX 15.0.2
  entered
  changedCursor null  HAND
  exited
  // stays HAND
  entered
  // stays HAND
  pressed
  changedCursor HAND  CROSSHAIR
  released
  changedCursor CROSSHAIR  DEFAULT
  pressed
  changedCursor DEFAULT  CROSSHAIR
  exited
  // cursor changed to <–>, with no change event
  released
  changedCursor CROSSHAIR  DEFAULT  <–– wrong; was <–> and stayed <–>
  entered
  changedCursor DEFAULT  HAND       <–– wrong; was <–>
  pressed
  changedCursor HAND  CROSSHAIR
  exited
  // cursor changed to <–>, with no change event
  entered
  changedCursor CROSSHAIR  HAND     <–– wrong; was <–> and stayed <–>
  released
  changedCursor HAND  DEFAULT       <–– wrong; was <–> and stayed <–>
  // Here if you move the cursor,
  // it does change to DEFAULT, with no change event.
*/

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