On 10/28/12 01:53, Klaus Rudolph wrote:
> I want to create some simple non rectangle widgets.
>
> It is quite simple to derive from any widget class, but all the classes
> have a rectangle boundary. Any mouse event will be handled to the
> rectangle region of the box of the widget I derive from.
>
> What can I do to only get / filter the incoming mouse events to my e.g.
> circular region?
Create your widget so that the circle is within the xwyh
rectangular boundary.
Then make your own function called e.g. event_inside_circle(x,y)
which, given an x,y value, returns true if the x,y value is inside
the circle, and false if not.
Use this in your widget's handle() method to accept/reject events
like FL_PUSH/FL_RELEASE, and detect mouse movement over the circular
region for events like FL_MOVE (e.g. if you want it to 'light up'
when the mouse is over it)
Use Fl::event_x(),Fl::event_y() to get the x,y position of the event.
If you need FL_MOVE events, be sure to return 1 in response to FL_ENTER
or you won't get them.
Be sure to still process other events like FL_ENTER normally,
as fltk will be expecting responses to these, and will only issue
them at your rectangular border. It becomes up to your widget to
handle non-rectangular boundaries within that region for subsequent
event handling like FL_MOVE, FL_PUSH, FL_RELEASE..
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