KeyEvent停止侦听JavaFX
我有一个非常简单的关键事件:KeyEvent停止侦听JavaFX,java,javafx,keyevent,Java,Javafx,Keyevent,我有一个非常简单的关键事件: @Override public void start(Stage stage) throws Exception { Group root = new Group(); Scene scene = new Scene(root); Canvas canvas = new Canvas( 900, 700 ); scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void start(Stage stage) throws Exception {
Group root = new Group();
Scene scene = new Scene(root);
Canvas canvas = new Canvas( 900, 700 );
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
switch (ke.getCode()) {
case UP:
System.out.println("UP");
break;
case DOWN:
System.out.println("DOWN");
break;
case LEFT:
System.out.println("LEFT");
break;
case RIGHT:
System.out.println("RIGHT");
break;
case ENTER:
//ke.consume();
break;
default:
break;
}
}});
@覆盖
public void start(Stage)引发异常{
组根=新组();
场景=新场景(根);
画布=新画布(900700);
scene.setOnKeyPressed(新的EventHandler(){
@凌驾
公共无效句柄(KeyEvent ke){
开关(ke.getCode()){
个案:
System.out.println(“UP”);
打破
按大小写:
System.out.println(“向下”);
打破
案例左:
系统输出打印项次(“左”);
打破
案例权利:
System.out.println(“右”);
打破
案例输入:
//消费();
打破
违约:
打破
}
}});
我想达到的目标:
我开始运行程序,如果我按下up、down、left、right键,输出会向我回写up、down、left、right(正确无问题)。
但是!如果我按回车键,如果我将按向上、向下、左、右、回车键或其他键,则不会将输出写回向上、向下、左、右
因此,当我按下回车按钮时,我想停止按键事件的“运行”。你有几个机会,这两个是我首先想到的 1)将密钥事件的侦听器存储为类的成员,然后按ENTER键取消注册。
private EventHandler<KeyEvent> keyHandler;
@Override
public void start(Stage stage) {
final Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
keyHandler = new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
switch (ke.getCode()) {
case ENTER:
scene.removeEventHandler(KeyEvent.KEY_PRESSED, keyHandler);
break;
case UP:
System.out.println("UP");
break;
case DOWN:
System.out.println("DOWN");
break;
case LEFT:
System.out.println("LEFT");
break;
case RIGHT:
System.out.println("RIGHT");
break;
default:
break;
}
}};
scane.addEventHandler(KeyEvent.KEY_PRESSED, keyHandler);
private Boolean enterPressed = false;
@Override
public void start(Stage stage) {
final Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
if(enterPressed){
ke.consume();
return;
}
switch (ke.getCode()) {
case ENTER:
enterPressed = true;
break;
case UP:
System.out.println("UP");
break;
case DOWN:
System.out.println("DOWN");
break;
case LEFT:
System.out.println("LEFT");
break;
case RIGHT:
System.out.println("RIGHT");
break;
default:
break;
}
}});
private EventHandler-keyHandler;
@凌驾
公众假期开始(阶段){
最终场景=新场景(新组());
stage.setTitle(“表格视图示例”);
舞台布景宽度(450);
舞台设置高度(500);
keyHandler=新的EventHandler(){
@凌驾
公共无效句柄(KeyEvent ke){
开关(ke.getCode()){
案例输入:
场景.removeEventHandler(按下KeyEvent.KEY_,keyHandler);
打破
个案:
System.out.println(“UP”);
打破
按大小写:
System.out.println(“向下”);
打破
案例左:
系统输出打印项次(“左”);
打破
案例权利:
System.out.println(“右”);
打破
违约:
打破
}
}};
scane.addEventHandler(按下KeyEvent.KEY_,keyHandler);
2)按ENTER键,将布尔值存储到成员,如果设置了此成员,则使用事件。
private EventHandler<KeyEvent> keyHandler;
@Override
public void start(Stage stage) {
final Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
keyHandler = new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
switch (ke.getCode()) {
case ENTER:
scene.removeEventHandler(KeyEvent.KEY_PRESSED, keyHandler);
break;
case UP:
System.out.println("UP");
break;
case DOWN:
System.out.println("DOWN");
break;
case LEFT:
System.out.println("LEFT");
break;
case RIGHT:
System.out.println("RIGHT");
break;
default:
break;
}
}};
scane.addEventHandler(KeyEvent.KEY_PRESSED, keyHandler);
private Boolean enterPressed = false;
@Override
public void start(Stage stage) {
final Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
if(enterPressed){
ke.consume();
return;
}
switch (ke.getCode()) {
case ENTER:
enterPressed = true;
break;
case UP:
System.out.println("UP");
break;
case DOWN:
System.out.println("DOWN");
break;
case LEFT:
System.out.println("LEFT");
break;
case RIGHT:
System.out.println("RIGHT");
break;
default:
break;
}
}});
private Boolean enterPressed=false;
@凌驾
公众假期开始(阶段){
最终场景=新场景(新组());
stage.setTitle(“表格视图示例”);
舞台布景宽度(450);
舞台设置高度(500);
scene.setOnKeyPressed(新的EventHandler(){
@凌驾
公共无效句柄(KeyEvent ke){
如果(按回车键){
消费();
返回;
}
开关(ke.getCode()){
案例输入:
enterPressed=true;
打破
个案:
System.out.println(“UP”);
打破
按大小写:
System.out.println(“向下”);
打破
案例左:
系统输出打印项次(“左”);
打破
案例权利:
System.out.println(“右”);
打破
违约:
打破
}
}});
两人都在工作,随便你选。太谢谢你了!我救了我一天