dev-cpp-users

[Dev-C++] restoring window

[Vlada D. <dj...@im...>]

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?

Re: [Dev-C++] restoring window

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

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?
> 

RE: [Dev-C++] restoring window

[Vlada D. <dj...@im...>]

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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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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> Welcome to geek heaven.
> http://thinkgeek.com/sf
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> 
> 
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> Welcome to geek heaven.
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Re: [Dev-C++] restoring window

[<ste...@ge...>]

----- Original Message -----
From: "Vlada Djurovic" <dj...@im...>
To: "'Per Westermark'" <pw...@ia...>
Cc: "'DevC++ help'" <dev...@li...>
Sent: Wednesday, September 25, 2002 3:36 PM
Subject: RE: [Dev-C++] restoring window


> 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?

Also when moving then window outside the screen ;)

> -----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?

     Stein Nygård - http://steinware.dk
lapido, ergo sum

Re: [Dev-C++] restoring window

[Abhijit S. <mu...@gm...>]

----- Original Message -----
From: Vlada Djurovic
To: DevC++ help
Sent: Tuesday, September 24, 2002 6:08 PM
Subject: [Dev-C++] restoring window


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?

----------------------

You can force a redraw when you receive WM_SIZE messages, by calling
InvalidateRect() or InvalidateRgn().

___________________________________________________________

Abhijit Shylanath

E-mail:   mu...@gm... || ibr...@bi...
Web-site: http://mudeth.tripod.com/