Function Reference


_GUICtrlRichEdit_SetUndoLimit

Sets the maximum number of actions that can stored in the undo queue

#include <GuiRichEdit.au3>
_GUICtrlRichEdit_SetUndoLimit ( $hWnd, $iLimit )

Parameters

$hWnd Handle to the control
$iLimit the maximum number of actions that can be stored in the undo queue

Return Value

Success: True.
Failure: False and sets the @error flag to non-zero.
@error: 101 - $hWnd is not a handle
102 - $iLimit is neither a positive number nor zero

Remarks

To disable the Undo feature, set $iLimit to zero.

The initial value of $iLimit is 100.

Related

_GUICtrlRichEdit_CanRedo, _GUICtrlRichEdit_CanUndo, _GUICtrlRichEdit_GetNextRedo, _GUICtrlRichEdit_Redo, _GUICtrlRichEdit_Undo

See Also

Search EM_SETUNDOLIMIT in MSDN Library.

Example

#include <GUIConstantsEx.au3>
#include <GuiRichEdit.au3>
#include <WindowsConstants.au3>

Example()

Func Example()
    Local $hGui, $iMsg, $idBtnNext, $iStep = 0, $idLblMsg, $hRichEdit
    $hGui = GUICreate("Example (" & StringTrimRight(@ScriptName, StringLen(".exe")) & ")", 320, 350, -1, -1)
    $hRichEdit = _GUICtrlRichEdit_Create($hGui, "This is a test.", 10, 10, 300, 220, _
            BitOR($ES_MULTILINE, $WS_VSCROLL, $ES_AUTOVSCROLL))
    $idLblMsg = GUICtrlCreateLabel("", 10, 235, 300, 60)
    $idBtnNext = GUICtrlCreateButton("Next", 270, 310, 40, 30)
    GUISetState(@SW_SHOW)

    _GUICtrlRichEdit_SetText($hRichEdit, "First paragraph")
    While True
        $iMsg = GUIGetMsg()
        Select
            Case $iMsg = $GUI_EVENT_CLOSE
                _GUICtrlRichEdit_Destroy($hRichEdit) ; needed unless script crashes
                ; GUIDelete()   ; is OK too
                Exit
            Case $iMsg = $idBtnNext
                $iStep += 1
                Switch $iStep
                    Case 1
                        _GUICtrlRichEdit_SetUndoLimit($hRichEdit, 200)
                        GUICtrlSetData($idLblMsg, "Increased the number of actions that can stored in the undo queue from 100 to 200")
                    Case 2
                        _GUICtrlRichEdit_SetUndoLimit($hRichEdit, 0)
                        GUICtrlSetData($idLblMsg, "Undo is disabled")
                        GUICtrlSetState($idBtnNext, $GUI_DISABLE)
                EndSwitch
        EndSelect
    WEnd
EndFunc   ;==>Example