JavaFX TextField:Swing InputVerifier的替代方法? [英] JavaFX TextField: Alternative for Swing InputVerifier?

问题描述

我正在寻找Swing InputVerifier替代JavaFX TextField.

I am looking for an alternative of Swing InputVerifier to JavaFX TextField.

Swing InputVerifier将阻止输入进行验证.

The Swing InputVerifier will prevent input that does verify.

考虑以下Swing JTextField代码:

Consider the following Swing JTextField code:

InputVerifier iv = new InputVerifier() {
    /* (non-Javadoc)
     * @see javax.swing.InputVerifier#verify(javax.swing.JComponent)
     */
    @Override
    public boolean verify(JComponent input) {
        JTextField tf = (JTextField) input;
        if (!myRegExTool.matches(tf.getText())) {
            return false;
        }
        return true;
    }
};
jinstance.setInputVerifier(iv);

我可以使用TextField.setOnKeyTyped或TextField.textProperty的侦听器来检查键入的文本.但是，这不会阻止无效文本进入TextField.但是，我可以删除无法验证的键入文本，但这不是一个好的解决方案.

I could use TextField.setOnKeyTyped or a listener to TextField.textProperty to check the typed text. However that will not prevent invalid text to get into the TextField. I could however delete typed text that does not verify, but that is not a good solution.

解决方案: 正如James_D所建议的那样，带有过滤器的TextFormatter是完美的解决方案

Solution: As suggested by James_D a TextFormatter with a filter was the perfect solution

    UnaryOperator<Change> textFilter = change -> {
        String input = change.getText();
        if (!myRegExTool.matches(input)) {
            return null;
        }
        return change;
    };
    instance.setTextFormatter(new TextFormatter<String>(textFilter));

推荐答案

首先由 James_D 建议<解决方案是使用带有过滤器的href ="https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/TextFormatter.html" rel ="nofollow noreferrer"> TextFormatter .

TextField instance = new TextField();
UnaryOperator<Change> textFilter = change -> {
    String input = change.getText();
    if (!change.isContentChange()) {
        return change;
    }
    if (!myRegExTool.matches(input)) {
        return null;
    }
    return change;
};
instance.setTextFormatter(new TextFormatter<String>(textFilter));

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