Q74043: HOWTO: Change the Color of an Edit Control

Article: Q74043
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.0,3.1
Operating System(s): 
Keyword(s): kb16bitonly kbCtrl kbEditCtrl kbGrpDSUser
Last Modified: 06-NOV-1999

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The information in this article applies to:

- Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1 
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SUMMARY
=======

The source code fragment below demonstrates how to paint the foreground and
background of a single-line edit control in an application developed for the
Microsoft Windows graphical environment. It creates a window that contains one
single-line edit control and paints the edit control cyan on blue.

Windows sends the WM_CTLCOLOR message to the parent of an edit control before the
control is painted. If desired, the parent window, usually a dialog box
procedure, can process this message and change the text and background colors of
the control.

NOTE: WM_CTRLCOLOR is obsolete on Windows NT and Windows 95. Instead, you would
use WM_CTLCOLORBTN, WM_CTLCOLORDLG, WM_CTLCOLOREDIT, WM_CTLCOLORLISTBOX,
WM_CTLCOLORMSGBOX, WM_CTLCOLORSCROLLBAR, or WM_CTLCOLORSTATIC.

MORE INFORMATION
================

The following MainWndProc demonstrates WM_CTLCOLOR processing:

    long FAR PASCAL MainWndProc(HWND hwnd, unsigned msg,
                                 WORD wParam, LONG lParam)
     {
     static   HWND     hwndEdit;
     static   HBRUSH   hBrush;

        switch (msg)
        {
           case WM_CREATE:
              {
                 HDC hdc;
                 TEXTMETRIC tm;

                 hdc = GetDC(hwnd);
                 GetTextMetrics(hdc, &tm);
                 ReleaseDC(hwnd, hdc);

                 hwndEdit = CreateWindow("edit", NULL,
                                 WS_CHILD | WS_VISIBLE
                                 | ES_AUTOHSCROLL | ES_MULTILINE,
                                 10, 20, 100, tm.tmHeight,
                                 hwnd, 1, hInst, NULL);

                 // Create a blue brush to be used for the edit control's
                 // background color.
                 hBrush = CreateSolidBrush(RGB(0, 0, 255));
              }
              break;

           case WM_CTLCOLOR:
           {
              // Set foreground and background colors only if this
              // is an edit control.
              if (HIWORD(lParam) == CTLCOLOR_EDIT)
              {
                 // Set the edit control's foreground text color to
                 // cyan and the text's background color to blue.
                 SetTextColor(wParam, RGB(0, 255, 255));
                 SetBkColor(wParam, RGB(0, 0, 255));

                 // Properly originate the background brush. This is
                 // of use if the brush is a pattern instead of a
                 // solid color.
                 UnrealizeObject(hBrush);
                 SetBrushOrg(wParam, 0, 0);

                 // Return a handle to the background brush for the edit
                 // control.
                 return (DWORD)hBrush;
              }
           }
           break;

           case WM_SETFOCUS:
              SetFocus(hwndEdit);
              return 0;

           case WM_DESTROY:
              PostQuitMessage(0);
              DeleteObject(hBrush);
              break;
        }
        return DefWindowProc(hwnd, msg, wParam, lParam);
     }

Additional query words:

======================================================================
Keywords          : kb16bitonly kbCtrl kbEditCtrl kbGrpDSUser 
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK300 kbWinSDK310
Version           : WINDOWS:3.0,3.1
Issue type        : kbhowto

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