UndoStep Class

In This Topic

Class representing DataModel's Undo.

Inheritance Hierarchy

System.Object
Eplan.EplApi.DataModel.UndoStep

Syntax

C#
C++/CLI

public sealed class UndoStep

public ref class UndoStep sealed

Remarks

The class implements System.IDisposable interface. All the functions that perform only changes to persistent objects of a project has basically Undo protocol capability. All features, that make the changes directly in the file system or registry are not covered by the Undo technology. This concerns for example opening/closing project, restore, creating UserDefinedPropertyDefinition, etc. Using of UndoStep allows to use GUI UndoList. E.q. it is possible to use Edit->Redo after UndoStep::DoUndo() call but not possible when using Transactions. No transaction is needed within UndoStep. It is not possible to call DoUndo() twice to reverse two steps. If a project is changed via API without using an UndoStep, the undo history of EPLAN is cleared. See also "Undoing and Redoing Actions" chapter of Eplan Help.

Example

UndoStep usage - only inside "using".

using (UndoStep undo = new UndoManager().CreateUndoStep())
{
	SelectionSet oSS = new SelectionSet();
	Function f = oSS.Selection[0] as Function;
	f.Properties.FUNC_CUSTOM_SUPPLEMENTARYFIELD01 = "new value";
	// ... code ...				//
    // and if needed DoUndo call//
    undo.DoUndo();
}

Public Methods

	Name	Description
	CloseOpenUndo	Close and open Undo protocol. Call this method to mark step in Undo action list.
	CloseUndo	Close Undo protocol. After call this method Undo action is not possible.
	Dispose	Virtual deterministic destructor.
	DoUndo	Overloaded. Make Undo action - reverse all operations up to last CloseOpenUndo call or initalization of UndoStep object.
	SetUndoDescription	Set description of Undo action.

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Reference

UndoStep Members
Eplan.EplApi.DataModel Namespace
UndoManager Class

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