RE: [Dev-C++] restoring window

[Per W. <pw...@ia...>]

WM_PAINT isn't used when drawing new information to a window. It's used
when RE-drawing. After a window has been hidden, and later are showed
again, it will receive a WM_PAINT message, to redraw the previously hidden
area.

The normal drawing for paint canvas is performed by hooking the mouse
messages.

/Per W


On Wed, 25 Sep 2002, Vlada Djurovic wrote:

> I'm having some problems with this, because the program "freezes" when I
> use WM_PAINT. Is this message generated when dialog box pops up in front
> of the window or when I draw line with the mouse? Is there some other
> message that causes window to redraw its content? 
> 
> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...] On Behalf Of Per
> Westermark
> Sent: utorak, 24. septembar 2002 14:45
> To: Vlada Djurovic
> Cc: DevC++ help
> Subject: Re: [Dev-C++] restoring window
> 
> Sorry.
> 
> Either perform all drawing to a bitmap that may be blitted back to the
> window on a WM_PAINT, or keep a list of all draw operations, and replay
> the list. The OS does not keep track of the contents of the windows.
> 
> /Per W
> 
> 
> On Tue, 24 Sep 2002, Vlada Djurovic wrote:
> 
> > Hello, list
> > I wrote a program for drawing in a window( nothing special, just
> colord
> > lines). It works fine, but, when I minimize the window, and then
> restore
> > it, the lines are gone. I suppose that when I restore the window from
> > minimized state, a WM_PAINT message is posted. Is this correct? Is
> there
> > some API function which can restore the contents of the window in
> > response to this message or I have to do it myself?
> > 
> 
> 
> 
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