Trying to avoid flicker with half success using WS_EX_COMPOSITED. Experiencing same issue of flickering edit control when mouse move over it. RRS feed

  • Question

  • I need help on this maybe old and long issue of flicker in C Win32 Native programming. Can somebody here help me with it. I've done some googling about it but didn't found perfect answer for my situation.

    My application is maybe simple.

    It's a window with splitter in-between these two controls:

    Left is a Listview control (not flickering anymore).

    CreateListView(HWND hwndParent)
       RECT rcClient;
       GetClientRect(hwndParent, &rcClient);
       HWND hWndListView = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTVIEW, L"",
             rcClient.right - rcClient.left,
             rcClient.bottom - rcClient.top,
             hwndParent, (HMENU) IDL_LV1, g_hInstance, NULL);
       return (hWndListView);

    Right is an Edit box control.

    CreateEditView(HWND hwndParent)
       HDC hdc = GetDC(hwndParent);
       // Create Font
       const TCHAR* fontName = TEXT("Myanmar Text");
       const long nFontSize = 8;
       LOGFONT lf = {0};
       lf.lfHeight = -MulDiv(nFontSize, GetDeviceCaps(hdc, LOGPIXELSY), 72);
       //lf.lfWeight = FW_BOLD;
       lstrcpy(lf.lfFaceName, fontName);
       HFONT s_hFont = CreateFontIndirect(&lf);
       // Create the edit control
     	HWND hwndEV = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("edit"), NULL,
    			0, 0, 0, 0, hwndParent, (HMENU) IDE_EDIT_VIEW, g_hInstance, NULL);	
       // Set the font for this control
       SendMessage(hwndEV, WM_SETFONT, (WPARAM) s_hFont, (LPARAM) MAKELONG(TRUE, 0));
       ReleaseDC(hwndParent, hdc);
       return hwndEV;

    I solved the flicker on the Listview by simple setting it to WS_CLIPCHILDREN style.

    Now while moving splitter, I managed to lessen the flicker on Edit box using a trick of a timer and using WS_EX_COMPOSITED on the main window. Though not 100% flicker free, I am ok to settle on the result. However, I noticed something odd on it. When the main window is on initial state (I mean when the window first load: not resized yet), the flicker trick i did is working good at least in my opinion. However when I started to resize the main window (drag the borders of the window, minimized it, maximized it), the odd things will happen. Now anytime I move in and out the mouse pointer on the Edit box it flickers. It flickers too now when I move the splitter (after I resized the main window of course). I hope I can show the video of it.

    PS: Flicker is noticeable only when there is text(s) on the edit control.

    Anyone who can help here is highly appreciated.

    Thank you!

    • Edited by Michael US Friday, September 11, 2020 12:00 AM
    Thursday, September 10, 2020 2:48 PM