ActionDeclareUndo (Function)

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ActionDeclareUndo (Function)

In french: ActionDeclareUndo

Declares how to cancel an action that was added by ActionDo. This function MUST be called when running the procedure passed to ActionDo.

Example

ActionDo(FEN_MonEditeur, ProcCréeLib, "Nouveau")
INTERNAL PROCEDURE ProcCréeLib(sLib)
	pNouveau is Control
	pNouveau <- ControlCreate("LIB_" + GetIdentifier(), typText, 150, 150, 80, 20)
	pNouveau..Caption = sLib 
	ActionDeclareUndo(ProcAnnuler)
	INTERNAL PROCEDURE ProcAnnuler()
		ControlDelete(pNouveau)
	END
END

ActionDeclareUndo(AnnulerOperation, CLIENT.IDClient)
// Gestion du Undo
INTERNAL PROCEDURE AnnulerOperation(nIDClient)
	IF HReadSeekFirst(CLIENT, IDClient, nIDClient) THEN
  	SourceToScreen()
	END
END

Syntax

ActionDeclareUndo(<WLanguage procedure> [, <Parameter 1> [... [, <Parameter N>]]])

<WLanguage procedure>: Procedure name

Name of WLanguage procedure to run. The code of this procedure must allow to cancel the action created by ActionDo.
This procedure is called when pressing Ctrl + Z or during the call to ActionUndo.
Note: Using an internal procedure allows direct access to local variables.

<Parameter 1>: Any optional type

First optional parameter that will be passed to the procedure.
In most cases, these parameter correspond to values used to restore the previous status.

<Parameter N>: Any optional type

Nth optional parameter that will be passed to the procedure.
In most cases, these parameter correspond to values used to restore the previous status.

Remarks

Use conditions

A WLanguage error occurs if this function is called outside a procedure added by ActionDo.

Component: wd300obj.dll