javafx:如何格式化双重属性进行绑定？

Question

我有两个双重属性price1和price2.我知道我可以将它绑定到这样的标签:

    Locale locale  = new Locale("en", "UK");
    fxLabel.textProperty().bind(Bindings.format("price1/price2: %.3f/%.3f",.price1Property(),price2Property()));

但显示的数字没有任何逗号分隔符(即显示123456.789而不是123,456.789).理想情况下,我希望做以下事情:

    String pattern = "###,###.###;-###,###.###";
    DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(locale);
    df.applyPattern(pattern);
    df.setMinimumFractionDigits(3);
    df.setMaximumFractionDigits(10);
    // bind df.format(value from price1 and price 2 property) to the label

但我不知道如何在房产上做这件事.我怎么解决这个问题？

Answer 1

使用JavaFX高级绑定API,您可以更改格式字符串并将语言环境传递给Binding.format:

Locale locale  = new Locale("en", "UK");
fxLabel.textProperty().bind(Bindings.format(locale, "price1/price2: %,.3f/%,.3f", price1Property(), price2Property()));

在此示例中,','标志用于格式字符串(java.util.Formatter API文档中记录的所有选项和可能性).

您还可以使用低级绑定API:

StringBinding stringBinding = new StringBinding() {

    private final static Locale LOCALE  = new Locale("en", "UK");
    private final static DecimalFormat DF;

    static {
        String pattern = "###,###.###;-###,###.###";
        DF = (DecimalFormat) NumberFormat.getNumberInstance(LOCALE);
        DF.applyPattern(pattern);
        DF.setMinimumFractionDigits(3);
        DF.setMaximumFractionDigits(10);
    }

    public StringBinding() {
        super.bind(price1Property(), price2Property());
    }

    @Override
    protected String computeValue() {
        return "price1/price2 " + DF.format(price1Property().get()) + "/" + DF.format(price2Property().get());
    }
};
fxLabel.bind(stringBinding);