我的代码是:
private EventHandler<KeyEvent> fieldChangeListener(final Integer max_Lengh, final Boolean fullTrimming) {
return new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
TextField field = (TextField) event.getSource();
String text = field.getText();
int lastCharIndex = 0;
if (field.getText().length() > 0) {
lastCharIndex = field.getText().length() - 1;
}
if (field.getText().length() >= max_Lengh) {
System.out.println("Exit 1");
event.consume();
}
if (fullTrimming) {
if (event.getCharacter().matches("\\s")) {
System.out.println("Exit 2");
event.consume();
}
} else {
if (field.getText().length() == 0 && event.getCharacter().matches("\\s")) {
System.out.println("Exit 3");
event.consume();
} else if (field.getText().substring(lastCharIndex).equals(" ")
&& event.getCharacter().matches("\\s")) {
System.out.println("Exit 4");
event.consume();
}
}
Region icon = (Region) ((StackPane)field.getParent()).getChildren().get(1);
text = text+event.getCharacter();
System.out.println("Char: " + text);
即使事件被消耗后,代码也会继续执行。因此我可以获得如下输出:
Exit 1
Exit 4
Char: jk i okkl
但我想在触发 event.consumed()
后立即退出 EventHandler
。我怎样才能做到这一点?
最佳答案
只需添加一些return
语句:
if (field.getText().length() >= max_Lengh) {
System.out.println("Exit 1");
event.consume();
return;
}
if (fullTrimming) {
if (event.getCharacter().matches("\\s")) {
System.out.println("Exit 2");
event.consume();
return;
}
} else {
...
}
...
那么您可能需要稍微重构一下这个方法。通常我们应该只针对一个 return
语句。
更新
这里是带有所有必要的返回
-s的代码:
public void handle(KeyEvent event) {
TextField field = (TextField) event.getSource();
String text = field.getText();
int lastCharIndex = 0;
if (field.getText().length() > 0) {
lastCharIndex = field.getText().length() - 1;
}
if (field.getText().length() >= max_Lengh) {
System.out.println("Exit 1");
event.consume();
return;
}
if (fullTrimming) {
if (event.getCharacter().matches("\\s")) {
System.out.println("Exit 2");
event.consume();
return;
}
} else {
if (field.getText().length() == 0 && event.getCharacter().matches("\\s")) {
System.out.println("Exit 3");
event.consume();
return;
} else if (field.getText().substring(lastCharIndex).equals(" ")
&& event.getCharacter().matches("\\s")) {
System.out.println("Exit 4");
event.consume();
return;
}
}
Region icon = (Region) ((StackPane)field.getParent()).getChildren().get(1);
text = text+event.getCharacter();
System.out.println("Char: " + text);
return;
}
关于java - event.consume()之后如何退出EventHandler?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45863597/