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[英]How to trigger an event on focus out for a textfield in javafx using fxml?
[英]How to trigger the ChangeListener when TextField loses focus ? JAVAFX
我有多個TextFields
並且我正在嘗試查找用戶輸入到其中的數字的總和。
credit1.textProperty().addListener(new creditChangeListener(this.credit1, this.course1, this.grade1));
credit2.textProperty().addListener(new creditChangeListener(this.credit2, this.course2, this.grade2));
credit3.textProperty().addListener(new creditChangeListener(this.credit3, this.course3, this.grade3));
credit4.textProperty().addListener(new creditChangeListener(this.credit4, this.course4, this.grade4));
我有一個內部類,實現ChangeListener
來處理每個TextField
用戶輸入。
private class creditChangeListener implements ChangeListener<String>{
private final TextField credit;
private final TextField course;
private final TextField grade;
public creditChangeListener(TextField credit, TextField course, TextField grade){
this.credit = credit;
this.course = course;
this.grade = grade;
}
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue){
if(!credit.getText().matches("[0-9]+")) grade.setText("");
if(!course.getText().isEmpty() && !grade.getText().isEmpty()) {
addSum();
}
}
private void addSum(){
sum += Integer.parseInt(credit.getText());
System.out.println("Current sum: " + sum);
}
}
我需要找到輸入到這些credit TextFields
中的數字的總和,但是ChangeListener
會逐位添加數字,而我需要輸入完整的數字。 我曾想過在TextFields
失去焦點之后觸發ChangeListener
,但我無法找到實現方法,也無法確定這是正確的方法。
不久前,我遇到了同樣的問題,我解決了這個問題,在Focused屬性中添加了Listener,而不是Changed屬性。 首先創建一個可以重用的監聽器:
private ChangeListener<Boolean> focusListener = new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
if (!newValue) {
sum(); //Do the sum logic here!!!
}
}
};
然后將更改偵聽器應用於所有文本字段
credit1.focusedProperty().addListener(focusListener);
credit2.focusedProperty().addListener(focusListener);
credit3.focusedProperty().addListener(focusListener);
credit4.focusedProperty().addListener(focusListener);
您可以以這種方式實現您的內部類,以在每次Textfield
失去焦點時觸發事件。
希望能幫助到你...
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