EM_STOPGROUPTYPING Message

An application sends an EM_STOPGROUPTYPING message to a rich edit control to stop the control from collecting additional typing actions into the current undo action. The control stores the next typing action, if any, into a new action in the undo queue.

Syntax

To send this message, call the SendMessage function as follows.


lResult = SendMessage(
    // returns LRESULT in lResult
   (HWND) hWndControl,
    // handle to destination control
   (UINT) EM_STOPGROUPTYPING,
    // message ID
   (WPARAM) wParam,
    // = (WPARAM) () wParam;
   (LPARAM) lParam
    // = (LPARAM) () lParam;

);

Parameters

wParam
Not used; must be zero.
lParam
Not used; must be zero.

Return Value

The return value is zero. This message cannot fail.

Remarks

A rich edit control groups consecutive typing actions, including characters deleted by using the BackSpace key, into a single undo action until one of the following events occurs:
The control receives an EM_STOPGROUPTYPING message.
The control loses focus.
The user moves the current selection, either by using the arrow keys or by clicking the mouse.
The user presses the Delete key.
The user performs any other action, such as a paste operation that does not involve typing.
You can send the EM_STOPGROUPTYPING message to break consecutive typing actions into smaller undo groups. For example, you could send EM_STOPGROUPTYPING after each character or at each word break.

Message Information

Header Declared in Richedit.h
Minimum operating systems Windows 95 with Rich Edit 2.0 , Windows 98, Windows NT 4.0