javafx checkbox clicked while key pressed will not change state - javafx

Question

I have a very simple problem, which I can't find in any other posts :
In javafx15 / java15.0.1, I am trying to click a Checkbox while pressing, for example, the CONTROL key... State is not changing.
I tried to catch the key (with a key event on the checkbox), and I do catch the control key pressed... But state of checkbox just does not change if a key is pressed simultaniously.
How to get this to just work in a transparent way ?
Here is a most basic simple code to illustate the problem :
package checkboxkeypressed;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.stage.Stage;
public class CheckboxWhileKeyPressedNotWorking extends Application {
private CheckBox checkbox = new CheckBox();
#Override
public void start(Stage primaryStage) {
checkbox.setText("Click me while pressing a key...");
Scene scene = new Scene(checkbox, 200, 50);
primaryStage.setTitle("Checkbox cannot be ticked while a key is pressed !!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Any help would be greatly appreciated.

Answer 1

Improving on the solution offered by etuygar:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.stage.Stage;
public class CheckboxWhileKeyPressedNotWorking extends Application {
private final CheckBox checkbox = new CheckBox();
private boolean isControlKeyDown = false;
#Override
public void start(Stage primaryStage) {
checkbox.setText("Click me while pressing <CNTRL> key");
checkbox.setOnMouseClicked(e->{
if(isControlKeyDown){
checkbox.fire(); //change check box state
}
});
Scene scene = new Scene(checkbox, 300, 50);
scene.setOnKeyPressed(keyEvent -> {
isControlKeyDown = keyEvent.isControlDown();
});
scene.setOnKeyReleased(keyEvent -> {
isControlKeyDown = keyEvent.isControlDown();
});
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Answer 2

You can do something like this.
package checkboxkeypressed;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.input.KeyCode;
import javafx.stage.Stage;
public class CheckboxWhileKeyPressedNotWorking extends Application {
private CheckBox checkbox = new CheckBox();
private boolean ctrlOk, lastState;
#Override
public void start(Stage primaryStage) {
checkbox.setText("Click me while pressing a key...");
Scene scene = new Scene(checkbox, 200, 50);
scene.setOnKeyPressed(event -> {
if (event.getCode() == KeyCode.CONTROL) ctrlOk = true;
});
scene.setOnKeyReleased(event -> {
if (event.getCode() == KeyCode.CONTROL) ctrlOk = false;
});
checkbox.setOnMouseClicked(event -> {
if (!ctrlOk) {
checkbox.setSelected(lastState);
} else {
checkbox.setSelected(!checkbox.isSelected());
lastState = checkbox.isSelected();
}
});
primaryStage.setTitle("Checkbox cannot be ticked while a key is pressed !!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Answer 3

Thank you soooooo much #miss-chanandler-bong !
So would this answer be ok ? I'm forcing the checkbox to be armed, when armed is changing...
package checkboxkeypressed;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.stage.Stage;
public class CheckboxWhileKeyPressed extends Application {
private CheckBox checkbox = new CheckBox();
#Override
public void start(Stage primaryStage) {
checkbox.setText("Click me while pressing a key...");
checkbox.armedProperty().addListener(changeListener -> checkbox.arm());
checkbox.arm();
checkbox.setOnKeyPressed(keyEvent -> processKeyPressed(keyEvent));
Scene scene = new Scene(checkbox, 200, 50);
primaryStage.setTitle("Checkbox CAN NOW be ticked while a key is pressed !!");
primaryStage.setScene(scene);
primaryStage.show();
}
private void processKeyPressed(KeyEvent keyEvent) {
if (keyEvent.getCode().equals(KeyCode.CONTROL)) {
System.out.println("Key IS control");
} else {
System.out.println("Key IS NOT control : '" + keyEvent.getCode().getName() + "'");
}
}
public static void main(String[] args) {
launch(args);
}
}