Called when a widget that can changes this parameter is mouseover, and wants to signal
that to the listeners.
onBeginParameterHover/onEndParameterHover is called by widgets from an UI thread
(typically on onMouseEnter/onMouseLeave) when the mouse has entered a widget that
could change its parameter.
It is useful be display the parameter value or related tooltips elsewhere in the UI,
in another widget.
To dispatch such messages to listeners, see `Parameter.
Not all widgets will want to signal this though, for example a widget that handles plenty
of Parameters will not want to signal them all the time.
If onBeginParameterHover was ever called, then the same widget should also call
onEndParameterHover when sensible.
Called when a widget that can changes this parameter is mouseover, and wants to signal that to the listeners.
onBeginParameterHover/onEndParameterHover is called by widgets from an UI thread (typically on onMouseEnter/onMouseLeave) when the mouse has entered a widget that could change its parameter.
It is useful be display the parameter value or related tooltips elsewhere in the UI, in another widget.
To dispatch such messages to listeners, see `Parameter.
Not all widgets will want to signal this though, for example a widget that handles plenty of Parameters will not want to signal them all the time.
If onBeginParameterHover was ever called, then the same widget should also call onEndParameterHover when sensible.