WM_PAINT problem

This is a discussion on WM_PAINT problem within the Windows Programming forums, part of the Platform Specific Boards category; I'm creating a new control to add to my growing library of custom controls, this one is a menu bar ...

  1. #1
    Semi n00b Mithoric's Avatar
    Join Date
    Jun 2003
    Posts
    293

    WM_PAINT problem

    I'm creating a new control to add to my growing library of custom controls, this one is a menu bar type one to replace rebar because it doesn't work well enough for me.

    I've already hit a snag though. I was just setting up the basics and I whent to test it when I found that the bar dissapears when you move the bottom of the window just behind the application bar at the bottom of the screen.



    And, when you maximize another app and the minimize it (so that it covers the window) the menu bar is there again!

    This code paints the window-
    Code:
    void DrawMCB(HWND hwnd,HDC dc)
    {
      
      //Setup the bounding rect
      RECT rc;
      GetWindowRect(hwnd,&rc);
      rc.right-=rc.left;
      rc.left = 0;
      rc.bottom-=rc.top;
      rc.top = 0;
      
      //Create pens and brushes
      HPEN dark = CreatePen(PS_INSIDEFRAME,1,GetSysColor(COLOR_3DDKSHADOW));
      HPEN light = CreatePen(PS_INSIDEFRAME,1,GetSysColor(COLOR_3DHILIGHT));
      HPEN none = CreatePen(PS_NULL,1,RGB(0,0,0));
      HBRUSH face = CreateSolidBrush(RGB(223,223,223));
      
      //Fill it in
      FillRect(dc,&rc,face);
      
      //Draw the basic frame
      SelectObject(dc,light);
      line(rc.left,rc.top,rc.right,rc.top);
      line(rc.left,rc.top,rc.left,rc.bottom);
      SelectObject(dc,dark);
      line(rc.left,rc.bottom-1,rc.right,rc.bottom-1);
      line(rc.right-1,rc.bottom,rc.right-1,rc.top);
    }
    This is the procedure for it -
    Code:
    LRESULT CALLBACK MCBProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
      switch(msg)
      {
      case WM_SIZE:
      {
        //Make it span the parent's width!
        RECT rc;
        GetWindowRect(GetParent(hwnd),&rc);
        int width = rc.right-=rc.left;
        GetWindowRect(hwnd,&rc);
        int height = rc.bottom-rc.top;
        SetWindowPos(hwnd,HWND_TOPMOST,0,0,width,height,SWP_NOZORDER);
        return 0;
      }break;
      case WM_PAINT:
      {
        PAINTSTRUCT ps;
        BeginPaint(hwnd,&ps);
        DrawMCB(hwnd,GetDC(hwnd));
        EndPaint(hwnd,&ps);
        return 0;
      }break;
      default:
        return DefWindowProc(hwnd,msg,wParam,lParam);
      }
      return 0;
    }
    I suspect my problem is I'm not telling it to pain after an event... Of course, I could be wrong.

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    Last edited by Mithoric; 12-15-2003 at 06:00 AM.

  2. #2
    train spotter
    Join Date
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    near a computer
    Posts
    3,856
    try adding

    InvalidateRect()//with the whole app area
    UpdateWindow()//get it to draw imediately without waiting for the msg to be processed

    You have a GDI leak as well

    You GetDC() but never release it (llok up ReleaseDC() )

    Try
    hdc=BeginPaint();
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
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  3. #3
    Semi n00b Mithoric's Avatar
    Join Date
    Jun 2003
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    Thanks I'll change some of my code.

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