MLM_QUERYUNDO

This message queries the undo or redo operations that are possible.

Syntax

param1
ULONG ulReserved; /* Reserved value, should be 0. */

param2
ULONG ulReserved; /* Reserved value, should be 0. */

usOperation (USHORT) - return

Operation that can be undone or redone.

0: An undo or redo operation is not possible.

WM_CHAR: A WM_CHAR message, or messages for a simple string of keystrokes, can

be undone or redone.

MLM_SETFONT: A MLM_SETFONT message can be undone or redone.

MLM_SETTEXTCOLOR: A MLM_SETTEXTCOLOR message can be undone or redone for both

background and foreground color.

MLM_CUT: A MLM_CUT message can be undone or redone.

MLM_PASTE: A MLM_PASTE message can be undone or redone.

MLM_CLEAR: A MLM_CLEAR message can be undone or redone.

rc (BOOL) - return

Undo or redo indicator.

TRUE: An undo is possible.

FALSE: A redo is possible.

The default window procedure takes no action on this message, other than to set reply to 0.