Thread: [win32] - how can i avoid controls flickers?

when i change the text, with STATIC class, i get flickers
how can i avoid them?
the WS_EX_COMPOSITED for parent is give me problems with WM_MOUSEMOVE message. someone told me about double buffering controls, but i realy don't know what is that

Originally Posted by Elysia

I believe that, in XP and above, there is a style that enables double buffering. Don't remember exactly what it's called, though.

it's called WS_EX_COMPOSITED, but it mess up with mouse move message

Also posted here.

Jim

Originally Posted by jimblumberg

Also posted here.

Jim

yes... i'm registed in some forums... here i used Joaquim, there i used Cambalinho.
Joaquim is my real name and the Cambalinho is 1 nice story from english prof
i hope theres no problem on that

Originally Posted by laserlight

Moved to Windows programming forum.


There's no problem being a member of multiple forum communities and being active on all of them, but if you want to pose a technical question, then pose it to just one forum community, i.e., the one you deem to be most appropriate for the question. Only if you do not receive any satistory answers from that community after some time should you seek for answers in another forum community, and when you do so, note that you have already asked elsewhere, giving a link if feasible.

thanks for that. i was trying find these subfurom, but isn't easy... thanks for move it.. thanks

Originally Posted by Elysia

Why is it difficult to find? If you go to the board index and scroll down, it's there.
I can understand it's difficult to understand where to put something the first time you visit a new board, but now you know how to find it next time!

yes i know... thanks

can i use the SetWindowsPos() without doing a flicker?

Originally Posted by novacain

Yes, but you cannot call it too often.
Put a counter into that call and see how often you are calling it.
BTW It does nothing but redraw the background, which could be done quicker with a WM_PAINT (as I have already suggested a couple of times....)

I you want more help then you MUST post a screen shot of what is happening now, and describe what is wrong.

I have done this type of UI and not had flicker but I suspect your design is flawed and will never work.

these code isn't ficker so many times, but it's better:

Code:

void setAutoSize(bool autosize)
    {
        blnAutoSize=autosize;
        if (autosize==true)
        {
            //Getting the DC Font amd select it
            HDC hdc = GetDC(hwnd);
            HFONT hFont = (HFONT)SendMessage(hwnd, WM_GETFONT, 0, 0);
            HFONT hOldFont = (HFONT)SelectObject(hdc, hFont);


            //Getting the
            RECT c = { 0, 0, 0, 0 };

            //Getting the text rectangle from actual caption
            char a[256];
            GetWindowText(this->hwnd,a,256);
            DrawText(hdc, a, strlen(a), &c, DT_CALCRECT | DT_EXPANDTABS);

            //add 2 to the size
            TEXTMETRIC v;
            GetTextMetrics (hdc,&v);
            c.right=c.right+(v.tmAveCharWidth / 2);
            c.bottom=c.bottom+(v.tmAveCharWidth / 2);

            //Clean the Font DC
            ReleaseDC(hwnd,hdc);

            //Getting the actual styles
            LONG s=GetWindowLongPtr(hwnd,GWL_EXSTYLE);
            LONG g=GetWindowLongPtr(hwnd,GWL_STYLE);

            //change the rectangle size for borders
            AdjustWindowRectEx (&c,g,FALSE,s );

            //Update the control
            SetWindowPos(hwnd, 0, 0, 0, c.right, c.bottom,
                SWP_NOZORDER|SWP_NOMOVE|SWP_NOACTIVATE);

            RECT b;
            b.left=getLeft();
            b.top=getTop();
            b.right=getLeft()+getWidth();
            b.bottom=getTop()+getHeight();
            InvalidateRect(hwnd,&b,false);
        }
    }

void setText(string text)
    {
        char* chrText = (char*)text.c_str();
        strCaption=text;
        SetWindowText(hwnd, chrText);

        if (blnAutoSize==true)
        {
            setAutoSize(true);
        }
        else
        {
            RECT b;
            b.left=getLeft();
            b.top=getTop();
            b.right=getLeft()+getWidth();
            b.bottom=getTop()+getHeight();
            InvalidateRect(hwnd,&b,false);
        }
    }

i can share the entire class, but, like Elysia said before, it's to many lines for see
i have another question: when the control is transparent:

Code:

void setTransparent(bool transparent)
    {
        blnTransparent = transparent;
        SetWindowPos(hwnd, 0, 0, 0, 0, 0,
            SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|
            SWP_DRAWFRAME | SWP_FRAMECHANGED|SWP_NOCOPYBITS);
    }

and in window procedure:

Code:

case WM_CTLCOLORSTATIC:
            {
                if ( inst->blnTransparent == true)
                {
                    SetTextColor((HDC)wParam, inst->clrTextColor);
                    SetBkMode( (HDC)wParam, TRANSPARENT);
                    return (LRESULT) GetStockObject(HOLLOW_BRUSH);
                }
                else
                {
                    DeleteObject(g_hbrBackground);
                    SetTextColor((HDC)wParam, inst->clrTextColor);
                    SetBkColor((HDC)wParam,inst->clrBackColor);
                    SetBkMode((HDC)wParam, TRANSPARENT);
                    g_hbrBackground = CreateSolidBrush(inst->clrBackColor);
                    return (LONG)g_hbrBackground;
                }
                inst->setText(inst->strCaption);
            }
            break;

the text isn't showed clean, but the new text is showed above the older
can you advice me?