EM_STOPGROUPTYPING message

Stops a rich edit 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.

wParam

Not used; must be zero.

lParam

Not used; must be zero.

The return value is zero. This message cannot fail.

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.

EM_UNDO