(wx-users) Re: problems with wxMSW 2.8.0

[Jacob (=Jouk) Jansen]

VZ wrote on 25-JAN-2007 12:42:40.23

>JJ> In the application the bitmap (and also lines, text etc..) are generated by a
>JJ> a procedure that is called from another language than c++ (i.e. C or F90)
>
> Why should it matter?
>
>JJ> By doing so the EVT_PAINT is not activated and the class of "canvas" is not
>JJ> known.
>
> I don't understand this, sorry.
The problem is that some c++ objects are not properly defined. One would
like to call routines bbbb::ccccc. But that is not always allowed.

>>JJ> So you need at least a way to force the EVT_PAINT (how do I do this?).
>>JJ>  However, I prefer the code as it is (and works in wxGTK) so that I can
>>JJ> "draw directly" to the window, without manualy calling the event-handler.
>
> This is wrong if only because your window won't be repainted correctly if
>the user covers it with another one or minimizes and then restores it.
Not when these are temporary drawings like "counters". Ofcourse I also wrote
the bitmap at repaint-time. To have everyting in the EVT_PAINT routine
requires a lot of book-keeping of the program about what was drawn and what
was erased etc.
    Cannot this be automated? In X-windows I normally switch on the
Backingstore option, which keeps an image of the window in memory at the
server side. Can this also be done in wxWidgets?
     
>JJ> What would be the reason for wxMSW not allowing wxClientDC of a window to
>JJ> paint over its children? Is this a limitation of Windows?
>
> Well, it makes sense to not allow one window overwrite another one,
>doesn't it?
 anyway it was not the problem, see one of my prevous posts
 
                 Jouk


Bush : All votes are equal but some votes are more equal than others.

>------------------------------------------------------------------------------<

  Jouk Jansen
		 
  joukj at hrem.nano.tudelft.nl

  Technische Universiteit Delft        tttttttttt  uu     uu  ddddddd
  Kavli Institute of Nanoscience       tttttttttt  uu     uu  dd    dd
  Nationaal centrum voor HREM              tt      uu     uu  dd     dd
  Lorentzweg 1                             tt      uu     uu  dd     dd
  2628 CJ Delft                            tt      uu     uu  dd     dd
  Nederland                                tt      uu     uu  dd    dd
  tel. 31-15-2782272                       tt       uuuuuuu   ddddddd

>------------------------------------------------------------------------------<