On 05/28/12 07:54, testalucida wrote:
>> On 05/28/12 04:44, testalucida wrote:
>>> seems as if widgets placed onto a Fl_Scroll don't keep their positions on
>>> scrolling.
>>
>> Yes, when you scroll, it changes the children's
>> xy positions in order to move them.
>
> and is there a way to prevent FLTK from doing so?
No, that is how it operates.
Drawing and event delivery of widgets all work in absolute
positions to prevent constant x/y conversions for events
and drawing.
Routes I /don't/ think would work easily:
a) put the widgets into a subwindow (which resets
the drawing origin to 0,0) and then pan that around, or..
b) use the new fltk matrix stuff (fl_pushmatrix(),
fl_translate()..)
to move the drawing origin around
I don't think (a) works well because IIRC sub Fl_Window's don't work
inside Fl_Scroll (for reasons I can't remember, but I recall having
trouble making that work), and although (b) would work for drawing,
I don't think the matrix stack affects important things like event
delivery.
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