ITT Rule IDL Version 7.0 Manual do Utilizador descarregar pdf (Página 179)

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Chapter 7: Creating an Operation 179

iTool Developer’s Guide Creating a New Generalized Operation

Note

The UndoOperation method could also have been implemented without the use of

the values stored in the command set object simply by decrementing the value of

the STYLE property for each target.

Creating a RedoOperation Method

The operation class RedoOperation method is called when the user redoes the

operation by selecting “Redo” from a menu or toolbar.

Example RedoOperation Method

The following example code shows a very simple RedoOperation method for the

ExampleOp operation:

FUNCTION ExampleOp::RedoOperation, oCommandSet

; Retrieve the IDLitCommand objects stored in the

; command set object.

oCmds = oCommandSet->Get(/ALL, COUNT = nObjs)

; Get a reference to the iTool object.

oTool = self->GetTool()

; Loop through the IDLitCommand objects and restore the

; new values.

FOR i = 0, nObjs-1 DO BEGIN

oCmds[i]->GetProperty, TARGET_IDENTIFIER = idTarget

oTarget = oTool->GetByIdentifier(idTarget)

; Get the new value

IF (oCmds[i]->GetItem('NEW_STYLE', styleIndex) EQ 1) THEN $

oTarget->SetProperty, STYLE = styleIndex

ENDFOR

RETURN, 1

END

Discussion

The RedoOperation method does the following things:

1. Retrieves an array of IDLitCommand objects from the supplied

IDLitCommandSet object

2. Gets a reference to the iTool object.

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