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javafx:如何格式化用于绑定的double属性?

[英]javafx: How can I format a double property for binding?

I have two double properties price1 and price2 . 我有两个双性price1price2 I know that I can bind it to a label like this: 我知道我可以将其绑定到这样的标签上:

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

but the displayed number does not have any commas separators (ie 123456.789 is shown instead of 123,456.789). 但显示的数字没有任何逗号分隔符(即显示的是123456.789,而不是123,456.789)。 Ideally, I would like to be do something like the following: 理想情况下,我希望执行以下操作:

    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

But I have no idea how to do this on a property. 但是我不知道如何在一个属性上执行此操作。 How can I solve this ? 我该如何解决?

Using the JavaFX high level binding API, you can change the format string and pass the locale to Binding.format : 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()));

In this example, the ',' flag is used in the format string (all options and possibilities documented in the java.util.Formatter API doc . 在此示例中,格式字符串中使用了','标志( java.util.Formatter API doc中记录的所有选项和可能性)。

You can also use the low level binding API: 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);

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