- Dialog: Copying data in order to display it

From: Douglas G. Danforth <"Douglas>
Date: Wed, 25 May 2005 11:48:08 -0400

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Folks,
The module Dialog exports the following update functions

        PROCEDURE Update (IN interactor: ANYREC);
        PROCEDURE UpdateList (IN interactor: ANYREC);
        PROCEDURE UpdateBool (VAR b: BOOLEAN);
        PROCEDURE UpdateInt (VAR i: INTEGER);
        PROCEDURE UpdateLInt (VAR l: LONGINT);
        PROCEDURE UpdateReal (VAR r: REAL);

There are no Updates for

2. SHORTCHAR the characters of the Latin?1 character set (0X .. 0FFX)
3. CHAR the characters of the Unicode character set (0X .. 0FFFFX)
4. BYTE the integers between MIN(BYTE) and MAX(BYTE)
5. SHORTINT the integers between MIN(SHORTINT) and MAX(SHORTINT)
8. SHORTREAL the real numbers between MIN(SHORTREAL) and MAX(SHORTREAL),
the value INF
10.SET the sets of integers between 0 and MAX(SET)

This seems(?) to necessitate 'copying' those data types to a record,
rec, and then calling Update(rec). That is inefficient and violates
the following principle.

GUI PRINCIPLE
Any module M should be displayable in a form F via a module D without
copying any fields of M into D.

Can this principle be realized in BlackBox? If not why not?

If one must copy then F must reference both M and D which seems unclean
(or all displayed exports of M must be copied to D and then only D is
referenced in F).

It copying can be avoided then F can reference the M data directly and
only the guards and notifiers need reside in D. This would provide a
clean separation of disciplines.

-Doug Danforth

--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy



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Received on Wed May 25 2005 - 17:48:08 UTC