As far as I could retrieve from the different forums and on-line documentation
it is possible to draw outside the expose-event but all point out that its
better to draw via the expose event. Currently this is a problem for my paint
algorithm as a complete model is being updated with information of which parts
to draw and which not. So i.e: I have an object that has a flag if its painted
or not. The normal flow would be:
Immediate paint
if paint flag of object is set then
draw object
mark object as painted
endif
end immediate paint
expose paint
if object intersects with the clip then
draw object
endif
end expose paint
In an ideal world I would mix them together and would get something like
paint
if paint flag is set of object intersect with the clip then
draw object
if not an system generated expose event ***
mark object as painted
endif
endif
end paint
Unfortunately I can not test on the condition marked by the ***. Removing that
condition could in some cases mark the object as painted though it was only
partially painted (as a result of a clip) by the expose event.
Considering this problem I have the next questions:
1. all the immediate drawing is done as a result of a key- or mouse-event (so
no extra thread). Isn't the event-dispatcher for the key- and mouse-event
handled by the same thread as the expose-event dispatcher (or even they are the
same event-dispatcher?). So if that is the case then am I not running a single
threaded program and therefore the immediate drawing should not interfere with
the expose event drawing?
2. Is it somehow possible to add extra info to an expose event so I my
expose-event-handle can at least detect that the event was the result of a call
to invalidate originating from me and not from the system?
3. gdk_flush, gdk_display_flush, gdk_display_sync I can call whatever I like
these do not seem to work. gdk_window_begin_paint_rect and
gdk_window_end_paint_rect just these appear to be more of the kind 'clear the
area with the background color'. Is there maybe another hidden function which
could solve my problem ?
Regards,
Douwe Vos
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