Class ModeButtonBehaviour

source code

object --+
         |
        ModeButtonBehaviour

Strategy that determines how the mode button of a specific mode
behaves. The protocol is a follows:

1. When the button is pressed, the press_immediate is called.

2. If the button is released shortly, the release_immediate is
   called.

3. However, if MOMENTARY_DELAY is elapsed before release,
   press_delayed is called and release_immediate will never be
   called.

4. release_delayed will be called when the button is released and
   more than MOMENTARY_DELAY time has passed since press.