Window repaint error?

[crunchycoder]

i have a frame inside a static window inside a static window and a scrollbar.
im usin this to make a scrolling panel, it works but...
when i scroll it up then back down, if the frame goes above the top of the main container 'StaticLeftContainerhWnd' i get streaks of the frame.

heres some code
inside the main window proc in the WM_CREATE msg i have

      ScrollbarhWnd = CreateWindowEx(0, "SCROLLBAR", NULL, WS_CHILDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | SBS_VERT, 154, 0, 16, 240, hwnd, (HMENU)IDC_SCROLLBAR, GetModuleHandle(NULL), NULL);
      StaticLeftContainerhWnd = CreateWindowEx(WS_EX_CLIENTEDGE, "STATIC", NULL, WS_CHILDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, 0, 0, 174, 240, hwnd, (HMENU)IDC_STATICLEFTCONTAINER, GetModuleHandle(NULL), NULL);
      StaticLeftScrollhWnd = CreateWindowEx(0, "STATIC", NULL, WS_CHILDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | SS_BLACKFRAME, 0, 0, 154, 240, StaticLeftContainerhWnd, (HMENU)IDC_STATICLEFTSCROLL, GetModuleHandle(NULL), NULL);
      FramehWnd = CreateWindowEx(WS_EX_NOPARENTNOTIFY, "BUTTON", "Caption", WS_CHILDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | BS_GROUPBOX, 2, 3, 150, 40, StaticLeftScrollhWnd, (HMENU)IDC_FRAMENAME, GetModuleHandle(NULL), NULL);

and in the WM_SCROLL msg

    case WM_VSCROLL:
    {
      siScrollInfo.nPos = GetScrollPos(ScrollbarhWnd, SB_CTL);
      switch (LOWORD(wParam))
      {
        case SB_LINEUP:
        {
          if (siScrollInfo.nPos > 0) {
            siScrollInfo.nPos--;
          }
          break;
        }
        case SB_LINEDOWN:
        {
          if (siScrollInfo.nPos < siScrollInfo.nMax) {
            siScrollInfo.nPos++;
          }
          break;
        }
      }
      SetWindowPos(StaticLeftScrollhWnd, 0, 0, -siScrollInfo.nPos, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
      SetScrollPos(ScrollbarhWnd, SB_CTL, siScrollInfo.nPos, true);
      break;
    }

heres a screenshot to see whats actually goin on


ive tride updatewindow() on all the hwnds including the main window
ive tried invalidaterect() on all the hwnds including the main window

in different orders and tryin different 1s one at a time
i dont know whats going on, any help would be awesome

thank you,
chrunchy

[LoKi_79]

are you handling WM_PAINT yourself for any of the windows?

does the same thing happen if you drag the whole window partly off of the screen?

[crunchycoder]

no im not handling wm_paint

it only does that when i use the scrollbar to move it
if i minimize and restore the main window the streaks are gone..until i use the scrollbar

[crunchycoder]

strange...i removed the
WS_CLIPCHILDREN
flag from the StaticLeftContainerhWnd createwindowex funtion and it doesnt do this anymore...
ill have to figure out WHY cause its going to drive me crazy until i do :P
thank you for tryin loki

[zackattach]

Did you ever fix this? I'm trying to draw rectangles that seem to "streak" upon scrolling in either direction. Also, the rectangles are completely redrawn when I minimize then restore the window but apparently the origin moves.

My code to draw the rectangles is

CRect TempRect = pDoc->GetNode(i); // The points for the rectangle
OnPrepareDC(pDC);
pDC->DPtoLP(&TempRect);
pDC->Rectangle(TempRect);

and I set the scroll bars sizes in OnInitialUpdate with

CSize Workspace(1000, 1000);
SetScrollSizes(MM_LOENGLISH, Workspace);

I have tried a variety of fixes in OnPrepareDC included setting the mapping mode to MM_LOENGLISH and setting the origin at 0, 0 but nothing works.

I'm new to visual applications and I think there must be a simple like I've seen in some "sketch" or "scribble" examples. Any help?