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Index > Windows > dialogbox control flicker problem

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dave_30



Joined: 15 Dec 2012
Posts: 14
dave_30
i'm working on the new interface for my program and i'm using dialogbox just to make my work just a little bit easier.
i'm using dib for the animations (drawing the stuff first into another dc) and then bitblt to copy it to the original dc everything seems to be fine except i if i add any control to my dialogbox control itself starts to flicker!but i found out that the redrawwindow windows api causes this since that's what i've used to update the window after doing the animations.
here is the code:

Code:
proc DlgProc uses ebx esi edi,hwndDlg,uMsg,wParam,lParam

local dummy dd ?

mov eax,[uMsg]
mov ebx,[wParam]
cmp eax,WM_INITDIALOG
je InitlizeApp
cmp eax,WM_CLOSE
je EndApp
cmp eax,WM_LBUTTONDOWN
je DragApp
cmp eax,WM_RBUTTONUP
je EndApp
cmp eax,WM_PAINT
je Paint
cmp eax,WM_TIMER
je Timer
cmp eax,WM_COMMAND
je BtnClk
cmp eax,WM_ERASEBKGND
je ProcessedMsg
xor eax,eax
jmp Finish

InitlizeApp:
push [hwndDlg]
pop [hwnd]
invoke SetTimer,[hwnd],1,1,0
invoke SetTimer,[hwnd],2,100,0
;stdcall uFMOD_PlaySong,Song,0,XM_RESOURCE
stdcall InitlizeGFX
jmp ProcessedMsg

DragApp:
stdcall DragObj,[hwnd]
jmp ProcessedMsg

Timer:
.if ebx = 1
stdcall DrawGFX
.elseif ebx = 2
stdcall TrnOptions
.endif
jmp ProcessedMsg

Paint:
stdcall CpyGFX
jmp ProcessedMsg

EndApp:
stdcall GFXShutDown
;stdcall uFMOD_PlaySong,0,0,0
invoke EndDialog,[hwnd],0

BtnClk:
cmp bx,1
jne ProcessedMsg

ProcessedMsg:
mov eax,1

Finish:
ret

endp

proc CpyGFX

local ps PAINTSTRUCT

mov ebx,[hwnd]
lea esi,[ps]
invoke BeginPaint,ebx,esi
invoke BitBlt,[hdc],0,0,ScreenWidth,ScreenHeight,[CanvasDc],0,0,SRCCOPY
invoke EndPaint,ebx,esi
ret

endp

proc DrawGFX

mov edi,[CanvasBuf]
mov ecx,ScreenWidth * ScreenHeight
xor eax,eax
repe stosd
call DrawStars
stdcall SetText,180,87,PrText,[bmpFont],0
stdcall DrawBitmapImg,0,0,[MainImgData],0,0
invoke GetClientRect,[hwnd],rc       
invoke RedrawWindow,[hwnd],rc,0,RDW_INVALIDATE
ret

endp    


is there anyway to fix the flicker problem on the controls?

edit by revolution: placed code tags
Post 15 Dec 2012, 12:16
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nmake



Joined: 13 Sep 2012
Posts: 193
nmake
WS_CLIPCHILDREN and WS_CLIPSIBLINGS is your friend. Also engage WM_ERASEBKGND and return TRUE from it. Set hbrBackground brush to 0 in the WNDCLASSEX window structure (if using a non-dialog), and of course do double buffering if necessary in WM_PAINT. Spend as little time as possible doing calculations in WM_PAINT, do all calculations outside of WM_PAINT to save time in the WM_PAINT handler. Things you can do, create a dib section that is as large as the entire screen so you dont have to re-create it every time the window resizes. You save time that way.
Post 15 Dec 2012, 12:24
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typedef



Joined: 25 Jul 2010
Posts: 2913
Location: 0x77760000
typedef
TIP: Your code formatting is eye straining.
Post 15 Dec 2012, 18:39
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dave_30



Joined: 15 Dec 2012
Posts: 14
dave_30
nmake wrote:
WS_CLIPCHILDREN and WS_CLIPSIBLINGS is your friend. Also engage WM_ERASEBKGND and return TRUE from it. Set hbrBackground brush to 0 in the WNDCLASSEX window structure (if using a non-dialog), and of course do double buffering if necessary in WM_PAINT. Spend as little time as possible doing calculations in WM_PAINT, do all calculations outside of WM_PAINT to save time in the WM_PAINT handler. Things you can do, create a dib section that is as large as the entire screen so you dont have to re-create it every time the window resizes. You save time that way.

i've added WS_CLIPCHILDREN and now flicker is gone,thx.
Post 16 Dec 2012, 18:44
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