Alvin wrote:
>> I think Greg had a demo for this... Erm, maybe this one?
>> http://www.seriss.com/people/erco/fltk/#DrawCoords
>
> After posting my question I went straight to Greg's page. His example does
> work, except I cannot see why my widget isn't receiving the FL_MOVE event.
Most likely reason is in order to receive FL_MOVE, you have
to return(1) in response to FL_ENTER. From the docs on "Handling
Events":
FL_ENTER
The mouse has been moved to point at this widget.
This can be used for highlighting feedback.
If a widget wants to highlight or otherwise track the mouse,
it indicates this by returning non-zero from its handle() method.
It then becomes the Fl::belowmouse() widget and will receive FL_MOVE and
FL_LEAVE events.
In my example it works because Fl_Group (the widget I'm deriving from)
does this already.
The reason FL_MOVE is not sent by default is to decrease 'event
traffic',
since passing every mouse movement down the widget hierarchy would
be a lot of unnecessary cpu spinning if the widgets don't need it.
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