PRB: Edit Control Margins too Large in Windows 95

• Microsoft Win32 Software Development Kit (SDK) version 4.0

SYMPTOMS

After you change the font in an edit control in Windows 95, the left and right margins are unusually large.

CAUSE

When the edit control receives the WM_SETFONT message, it calculates the left and right margins based on the average character width of the new font. The control does not do this when it is created. This results in the margins changing drastically when the font is changed.

RESOLUTION

Get the margins of the edit control before sending the WM_SETFONT message, and then set the margins back to their original sizes. The following code fragment demonstrates how to do this:

{ DWORD dwMargins;

dwMargins = SendDlgItemMessage( hWnd,

                                 IDC_EDIT,
                                 EM_GETMARGINS,
                                 0,
                                 0);

                     IDC_EDIT,
                     WM_SETFONT,
                     (WPARAM)<new font handle>,
                     0);

                     IDC_EDIT,
                     EM_SETMARGINS,
                     EC_LEFTMARGIN | EC_RIGHTMARGIN,
                     MAKELPARAM(LOWORD(dwMargins), HIWORD(dwMargins)));

}

STATUS

This behavior is by design.