TdxSpreadSheetUndo Class

An action object that implements the Undo end-user command in spreadsheet-based applications.

Declaration

TdxSpreadSheetUndo = class(
    TdxSpreadSheetCustomEditAction
)

This class does not introduce any new public members. Its overridden Execute function cancels the last action in the opened spreadsheet document.

UI elements linked to a TdxSpreadSheetUndo action object are enabled only if the following conditions are met:

The Spreadsheet document edit operations are allowed (that is, the control’s OptionsBehavior.Editing property is set to True).
The history functionality is enabled (the control’s OptionsBehavior.History property is set to True).
The undo action list is not empty (that is, the control’s History.UndoActionCount property value is positive).
An in-place editor is inactive (the active worksheet‘s IsEditing property returns False).