How to get Multiple Key Combinations

Question

Hi,
I am trying to get the event for multiple key combinations, ie some thing like "*Ctrl + I + M*" or "*Alt + A + S + D*".
For two key combinations ( like Ctrl+I or Ctrl+M) i am able to get, but for more than two keys combinations, can someone give an idea how to get it.
I tried with both KeyCodeCombination and KeyCharacterCombination.
Below is a quick example to check for the key combination demo.
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.KeyCharacterCombination;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCodeCombination;
import javafx.scene.input.KeyCombination;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class KeyCombinationDemo extends Application {
     Stage stage;
     Scene scene;
     StackPane root;
     public static void main(String[] args) {
          Application.launch(args);
     @Override
     public void start(Stage stage) throws Exception {
          this.stage = stage;
          root = new StackPane();
          root.getChildren().add(new Label("Enter any Key"));
          this.scene = new Scene(root, Color.LINEN);
          stage.setTitle(this.getClass().getSimpleName());
          stage.setWidth(600);
         stage.setHeight(600);
         stage.setScene(this.scene);
         stage.show();
          final KeyCombination keyComb1=new KeyCodeCombination(KeyCode.I,KeyCombination.CONTROL_DOWN);
          final KeyCharacterCombination keyComb2 = new KeyCharacterCombination("M",KeyCombination.CONTROL_DOWN);
          this.scene.addEventHandler(KeyEvent.KEY_RELEASED, new EventHandler<KeyEvent>() {
               @Override
               public void handle(KeyEvent event) {
                    if(keyComb1.match(event)){
                         System.out.println("Ctrl+I pressed");
                    }else if(keyComb2.match(event)){
                         System.out.println("Ctrl+M pressed");
}Thanks in Advance.
Regards,
Sai Pradeep Dandem.

Answer 1

Hi John,
Thanks for the prompt response.
I tried the way you suggested and it worked well !! Thanks :)
But, still i am expecting a direct way to handle this. :p
Anyway here is code which i modified accordingly
final String keyCombination1 = "_ALT_E_O";
final String keyCombination2 = "_ALT_E_P";
final String keyCombination3 = "_CONTROL_H";
final StringBuilder key = new StringBuilder();
this.scene.addEventHandler(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() {
     @Override
     public void handle(KeyEvent event) {
          String codeStr = event.getCode().toString();
          if(!key.toString().endsWith("_"+codeStr)){
               key.append("_"+codeStr);
this.scene.addEventHandler(KeyEvent.KEY_RELEASED, new EventHandler<KeyEvent>() {
     @Override
     public void handle(KeyEvent event) {
          if(key.length()>0){
               if(key.toString().equals(keyCombination1)){
                    System.out.println("Key Combination 1 pressed");
               }else if(key.toString().equals(keyCombination2)){
                    System.out.println("Key Combination 2 pressed");
               }else if(key.toString().equals(keyCombination3)){
                    System.out.println("Key Combination 3 pressed");
               key.setLength(0);
});Thanks & Regards,
Sai Pradeep Dandem