> So you're saying the logic is that after a window area is > marked as damaged (I presume that's what's happening, but > don't know for sure) it is the group that determines if a > child should be repainted and it only looks at its bounds > (even though the position of a child is window oriented)? Or > would it be more in the lines of something like something is > only scanning the first level of items in a window / group > and if found to be within those bounds that it would then > send that group a redraw request? In this case it's a member > of a group, and it just protrudes a little above the group bounds.
I think what happens is something like this (may be some variation host-to-host but the intent goes something like this...) If you mark a Fl_Group for redraw, then when it is processed a clip region is set that matches the bounds of the Fl_Group - the assumption is that all of the groups children lie entirely within the group (fast-n-light and all that) - then the drawing of the group and all it's child widgets is processed. So, and widget that actually lies all (or partly) outside the group will not be drawn (fully) due to the clip. No attempt is made in the default Fl_Group to compute the actual clip region of the group and all its children (in case any child widgets lie outside the group) as that might conceivably be expensive to do, thought it would be easy enough to create a subclass of Fl_Group that did compute an "overall-clip" accounting for its children and set that instead in the draw method. In general, the idea is that if anyone creates a group that has children that are physically outside of the groups natural boundary, that's a special case that they have done on purpose, so they will make specific provision to get the "extra" area redrawn - usually by asking the parent to redraw, though a special-purpose group widget could easily be created too. SELEX Galileo Ltd Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. Company no. 02426132 ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
