如何在onfocus和outfocus上对javaFX TextField执行任务？ [英] How perform task on javaFX TextField at onfocus and outfocus?

问题描述

我正在研究JavaFX项目。我需要在JavaFX上执行一些任务 TextField 。

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

例如关于on focus事件 TextField 我要打印

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

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

以及对焦事件应打印

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

推荐答案

我认为看一个例子可能会有所帮助将ChangeListener指定为匿名内部类，如scottb所述。

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");
        }
    }
});

我希望这个答案有用！

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