[英]How to bind StringProperty to ObjectProperty<Integer> in JavaFX?
[英]How to bind a StringProperty to a BigDecimal?
我有一個ChangeListener
,當觸發時,將findGPA()
方法。
private void findGPA(){
GPA = gradeCre/sum;
decGPA = new BigDecimal(GPA);
decGPA = decGPA.setScale(2, RoundingMode.CEILING);
System.out.println("Your average GPA is: " + decGPA);
}
BigDecimal
的初始化如下:
private BigDecimal decGPA = BigDecimal.ZERO;
在initialize()
方法中:
SubmitStageBorderPane.setBottom(AddStackCircle());
哪個調用:
private StackPane AddStackCircle(){
StackPane stackCircle = new StackPane();
StringProperty gpa = new SimpleStringProperty("");
gpa.bind(new SimpleStringProperty(decGPA.toString()));
Text avgGPA = createText("Your semester GPA is: " + gpa);
Circle resultCircle = createCircle(avgGPA);
stackCircle.getStyleClass().add("stackCircle");
stackCircle.getChildren().addAll(resultCircle, avgGPA);
return stackCircle;
}
private Circle createCircle(Text avgGPA){
Circle resultCircle = new Circle();
resultCircle.setFill(Color.GREEN);
resultCircle.setStroke(Color.GREY);
resultCircle.setStrokeWidth(3);
resultCircle.setRadius(getWidth(avgGPA) / 2 + 10);
return resultCircle;
}
private Text createText(String text){
Text avgGPA = new Text(text);
avgGPA.setBoundsType(TextBoundsType.VISUAL);
avgGPA.getStyleClass().add("avgGPA");
return avgGPA;
}
但是,當我運行它時,它將生成以下標簽文本, Your semester GPA is: StringProperty[bound, invalid]
,即使decGPA
的值更改,它也不會更改。
對於文本進行更新,你需要將文本綁定Text
節點的簡單設置的文字。 此外,您應該將其綁定到實際更新的屬性,而不僅僅是永遠不會被修改的屬性(例如new SimpleStringProperty(decGPA.toString())
)。
假設findGPA
方法被正確調用,則應按以下方式實現:
private final ObjectProperty<BigDecimal> decGPA = new SimpleObjectProperty(BigDecimal.ZERO);
private void findGPA(){
GPA = gradeCre/sum;
decGPA.set(BigDecimal.valueOf(GPA).setScale(2, RoundingMode.CEILING));
System.out.println("Your average GPA is: " + decGPA.get());
}
private Text createText(ObservableValue<String> textExpression){
Text avgGPA = new Text();
avgGPA.textProperty().bind(textExpression);
avgGPA.setBoundsType(TextBoundsType.VISUAL);
avgGPA.getStyleClass().add("avgGPA");
return avgGPA;
}
Text avgGPA = createText(decGPA.asString("Your semester GPA is: %s"));
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