如何在焦点和焦点之外在 JavaFX TextField 上执行任务? [英] How perform task on JavaFX TextField at onfocus and outfocus?

问题描述

我正在从事 JavaFX 项目.我需要在 JavaFX TextField 上执行一些任务.

I am working on JavaFX project. I need to perform some task on a JavaFX TextField.

例如，我想打印的 TextField 的on focus"事件

For example on the "on focus" event for the TextField I want to print

System.out.println("Textfield on focus");

在out focus"事件上它应该打印

and on the "out focus" event it should print

System.out.println("Textfield out focus");

推荐答案

我认为看一个将 ChangeListener 指定为匿名内部类(如 scottb 提到的)的示例可能会有所帮助.

I thought it might be helpful to see an example which specifies the ChangeListener as an anonymous inner class like scottb mentioned.

TextField yourTextField = new TextField();
yourTextField.focusedProperty().addListener(new ChangeListener<Boolean>()
{
    @Override
    public void changed(ObservableValue<? extends Boolean> arg0, Boolean oldPropertyValue, Boolean newPropertyValue)
    {
        if (newPropertyValue)
        {
            System.out.println("Textfield on focus");
        }
        else
        {
            System.out.println("Textfield out focus");
        }
    }
});

希望这个回答有帮助！

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