默认情况下，如何知道何时对父组件可见或由用户操作启动了对第一个组件的关注

Question

I have a popup component which has a first component JTextComponent and I need to recognize in FocusListener where from the focus gained to this component: when popup appears and the component get focus by default or user clicks on it. I didn't find the way to do it using FocusEvent.

Answer 1

Assuming a general use-case, what exactly is it that is tripping you? In my view:

1. Write the code you wish to execute when focus is gained in a method, say onFocusGained(boolean defaultFocus) .
2. Call it from the FocusEvent methods with onFocusGained(true) .
3. Call it from the MouseAdapter methods with onFocusGained(false) .