Problem drawing the desktop in the updated color

[Timo Kreuzer]

Hi,

First, this is going to be a long post, sorry ;-)
You might have noticed, that I have been working on the desk.cpl 
appearance tab, wich is working partly.
Here's the first version: 
http://www.reactos.org/bugzilla/show_bug.cgi?id=1732

Some things still don't work. For example the desktop doesn't get 
repainted in the new color.
> ------- /Comment #5 
> http://www.reactos.org/bugzilla/show_bug.cgi?id=1732#c5 >From 
> jimtabor 2006-08-05 04:46:36 CET / [reply
> http://www.reactos.org/bugzilla/show_bug.cgi?id=1732#add_comment]
>
> Hi,
> You can use WM_SYSCOLORCHANGE in the desktop proc if it is used, should be!,
> user32/misc/desktop.c;
>
> static
> LRESULT
> WINAPI
> DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
> {
>     DPRINT1("Desktop Class Atom!\n");
>     switch(message)
>    {
>     case WM_NCCREATE:
>          return TRUE;
> case WM_CREATE:
> /* when I spy I see notify */
>      SendNotifyMessageW( hwnd, WM_SYSCOLORCHANGE , 0, 0 );
> break;
>
> case WM_SYSCOLORCHANGE:
> /* update everything, well in theory anyway */
>      RedrawWindow( hwnd, NULL, 0, RDW_INVALIDATE | RDW_ERASE |
>
> RDW_ALLCHILDREN );
>     break;
> default:
>      return DefWindowProcW(hwnd,message,wParam,lParam);
> }
> return 0;  /* all other messages are ignored */
>
> }
>
> Its crude, I'm not sure if it will compile, its off the top of my head ATM.
> 8^D
> Thanks,
> James

Thanks for helping, James. I tried it, but it doesn't work.
1.) Sending WM_SYSCOLORCHANGE on WM_CREATE will probably do nothing, 
because the desktop has just been created with the initial SysColors, no 
need to update them.
2.) RedrawWindow calls NtUserRedrawWindow wich calls co_UserRedrawWindow 
wich calls co_IntPaintWindows wich sends a WM_PAINT message to the 
desktop window.
WM_PAINT is then passed to DefWindowProc and passed on to 
User32DefWindowProc wich does only repaint the icon as it seems.
So WM_PAINT must be evaluated in DesktopWndProc.

I tried the following:
>   case WM_PAINT:
>   {
>      PAINTSTRUCT ps;
>      HDC hdc = BeginPaint(hwnd, &ps);
>      PaintDesktop(hdc);
>      EndPaint(hwnd, &ps);
>   }

PaintDesktop calls NtUserPaintDesktop, wich then paints the desktop.
I have also replaced
  DesktopBrush = (HBRUSH)UserGetClassLongPtr(WndDesktop->Class, 
GCL_HBRBACKGROUND, FALSE);
with
  DesktopBrush = IntGetSysColorBrush(COLOR_BACKGROUND);

But the desktop is still painted in the original color, whereas the icon 
text is in the color I have set in the registry.

I played a little around with the code in NtUserPaintDesktop. I added 
the following code before the desktop background is painted:
> if (IntGetSysColor(COLOR_BACKGROUND) == 0) // This is true after 
> SysColors are loaded from Registry
> {
>   DesktopBrush = IntGetSysColorBrush(COLOR_ACTIVECAPTION);
> }

And suddenly the desktop is painted in COLOR_ACTIVECAPTION.
This is strange, because I also added CreateSysColorObjects(); at the 
beginning of NtUserPaintDesktop.

Anybody any idea?

[Timo Kreuzer]

Some additionms:

1.) IntGetSysColorBrush is a fuction I wrote to make things easier:
> HBRUSH IntGetSysColorBrush(UINT nBrush)
> {
>   if (nBrush < NUM_SYSCOLORS)
>   {
>     return SysColorBrushes[nBrush];
>   }
>   else
>   {
>     return NULL;
>   }
> }

2.) After starting ROS the desktop gets painted in original color first. 
After userlogon (during hw detection, shortly before explorer starts) 
the desktop get painted in COLOR_ACTIVECAPTION.

[Saveliy Tretiakov]

Timo Kreuzer ?????:
> 1.) IntGetSysColorBrush is a fuction I wrote to make things easie

It is already implemented (see r23525).

[Timo Kreuzer]

Saveliy Tretiakov schrieb:
> Timo Kreuzer ?????:
> > 1.) IntGetSysColorBrush is a fuction I wrote to make things easie
>
> It is already implemented (see r23525).

Funny, my working copy was only 5 revisions behind ;-)
I also implemented IntGetSysColor.
> HGDIOBJ FASTCALL
> IntGetSysColorBrush(INT Object)
> {
>   return ((Object < 0) || (NUM_SYSCOLORS <= Object)) ? NULL : 
> SysColorBrushes[Object];
> }

First question:
Is there a reason you used HGDIOBJ and DWORD instead of HBRUSH and 
COLORREF (that's what I used).

Second question:
Wouldn't an "(UINT Object)" make life easier here? There would be no 
need for (Object < 0) (?)
IntGetSysColor also uses an INT instead of UINT.
Just my 3,1415 cents ;-)
Timo

[Saveliy Tretiakov]

Timo Kreuzer ?????:
> First question:
> Is there a reason you used HGDIOBJ and DWORD instead of HBRUSH and 
> COLORREF (that's what I used).
>
> Second question:
> Wouldn't an "(UINT Object)" make life easier here? There would be no 
> need for (Object < 0) (?)
> IntGetSysColor also uses an INT instead of UINT.

Maybe. I did it the same way it was in NtGdiGetStockObject.

[James Tabor]

Hi,
Timo Kreuzer wrote:
> Hi,
>
> First, this is going to be a long post, sorry ;-)
> You might have noticed, that I have been working on the desk.cpl 
> appearance tab, wich is working partly.
> Here's the first version: 
> http://www.reactos.org/bugzilla/show_bug.cgi?id=1732
>
> Some things still don't work. For example the desktop doesn't get 
> repainted in the new color.
> > ------- /Comment #5 
> > http://www.reactos.org/bugzilla/show_bug.cgi?id=1732#c5 >From 
> > jimtabor 2006-08-05 04:46:36 CET / [reply
> > http://www.reactos.org/bugzilla/show_bug.cgi?id=1732#add_comment]
> >
> > Hi,
> > You can use WM_SYSCOLORCHANGE in the desktop proc if it is used, should be!,
> > user32/misc/desktop.c;
> >
> > static
> > LRESULT
> > WINAPI
> > DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
> > {
> >    DPRINT1("Desktop Class Atom!\n");
> >    switch(message)
> >   {
> >    case WM_NCCREATE:
> >         return TRUE;
> >
> > case WM_CREATE:
> >    /* when I spy I see notify */
> >         SendNotifyMessageW( hwnd, WM_SYSCOLORCHANGE , 0, 0 );
> >    break;
> >
> > case WM_SYSCOLORCHANGE:
> >    /* update everything, well in theory anyway */
> >         RedrawWindow( hwnd, NULL, 0, RDW_INVALIDATE | RDW_ERASE |
> > RDW_ALLCHILDREN );
> >    break;
> >
> > default:
> >         return DefWindowProcW(hwnd,message,wParam,lParam);
> >    }
> >    return 0;  /* all other messages are ignored */
> > }
> >
> > Its crude, I'm not sure if it will compile, its off the top of my head ATM.
> > 8^D
> > Thanks,
> > James
>
> Thanks for helping, James. I tried it, but it doesn't work.

Not surprised at all. We dont use the desktop class when the explorer desktop is opened.
> 1.) Sending WM_SYSCOLORCHANGE on WM_CREATE will probably do nothing, 
> because the desktop has just been created with the initial SysColors, no 
> need to update them.

To init the system colors before the desktop is displayed.

OT Q. Is our explorer desktop a plug in replacement to the windows one?
One way to find out,,, look for explorer desktop replacement projects and read their
source.
> 2.) RedrawWindow calls NtUserRedrawWindow wich calls co_UserRedrawWindow 
> wich calls co_IntPaintWindows wich sends a WM_PAINT message to the 
> desktop window.

Redraw should refresh all of its children including its self and not push the
responsibility off to another app.
> WM_PAINT is then passed to DefWindowProc and passed on to 
> User32DefWindowProc wich does only repaint the icon as it seems.
> So WM_PAINT must be evaluated in DesktopWndProc.

No its not.
> I tried the following:
> >   case WM_PAINT:
> >   {
> >      PAINTSTRUCT ps;
> >      HDC hdc = BeginPaint(hwnd, &ps);
> >      PaintDesktop(hdc);
> >      EndPaint(hwnd, &ps);
> >   }

this could be done in explorer desktop?
> PaintDesktop calls NtUserPaintDesktop, wich then paints the desktop.
> I have also replaced
>   DesktopBrush = (HBRUSH)UserGetClassLongPtr(WndDesktop->Class, 
> GCL_HBRBACKGROUND, FALSE);
> with
>   DesktopBrush = IntGetSysColorBrush(COLOR_BACKGROUND);
>
> But the desktop is still painted in the original color, whereas the icon 
> text is in the color I have set in the registry.
>
> I played a little around with the code in NtUserPaintDesktop. I added 
> the following code before the desktop background is painted:
> > if (IntGetSysColor(COLOR_BACKGROUND) == 0) // This is true after 
> > SysColors are loaded from Registry
> > {
> >   DesktopBrush = IntGetSysColorBrush(COLOR_ACTIVECAPTION);
> > }
>
> And suddenly the desktop is painted in COLOR_ACTIVECAPTION.
> This is strange, because I also added CreateSysColorObjects(); at the 
> beginning of NtUserPaintDesktop.
>
> Anybody any idea?

No, sorry, not at this moment.

For the Devs, Yes, we plug in explorer by creating the desktop using the
desktop class, So the class proc will get called. Was there a patch?

8^)
Okay,
James

[James Tabor]

> > I tried the following:
> > >  case WM_PAINT:
> > >  {
> > >     PAINTSTRUCT ps;
> > >     HDC hdc = BeginPaint(hwnd, &ps);
> > >     PaintDesktop(hdc);
> > >     EndPaint(hwnd, &ps);
> > >  }
>
> this could be done in explorer desktop?

Yes, DarkStep, in Desktop.cpp, uses this.

[Martin Fuchs]

Just fixed the problem in Explorer - the shell background will now be
refreshed at system color changes.

Regards,

Martin

--
Martin Fuchs
[e-mail]

[Timo Kreuzer]

Martin Fuchs schrieb:
> Just fixed the problem in Explorer - the shell background will now be
> refreshed at system color changes.

That's great. Thanks. I couldn't test it yet, becaue explorer won't 
start in current trunk. (I think userinit does not complete, because 
with my code syscolors are no longer loaded from the registry)
But I guess it will at least let the new color be applied instantly.

Q: I added SendSysColorChangeMessage() to win32k wich sends 
WM_SYSCOLORCHANGE to *all* windows after setting new syscolors. Is that 
the way it should be? Or should the message be passed to child windows 
by the windows itself (in DefWindowProc)?

But it will probably not help to use the correct SysColorBrush on 
startup, wich was the thing I stumbled upon.
It seems that NtUserPaintDesktop is called several times (15+, but not 
really sure about that) before userinit (Does that cause the heavy 
redraw of the text in the hardware detection window on startup?). And on 
userinit SysColors[COLOR_BACKGROUND] is loaded correctly from registry 
(before explorer.exe is loaded), but NtUserPaintDesktop won't use the 
correct SysColorBrush, although CreateSysColorObjects() is called at the 
beginning.

I think CreateSysColorObjects might not work correctly.But I can't 
figure out why.If noone has a tip for me, I'll go on trying to find out, 
hopefully DBG=1 boots now and explorer will start again soon.

Greetings,
Timo