RE: TZF - TTzVFile anomaly

Marie,

Your code changes solved my problem.  I modified your changes a little to get exactly what I needed and it works great.  To accomplish what I desired, the key to making it work was using the TTzVFile methods AppendBlank and DeleteRec instead of the TDataset methods Insert and Delete.  Thanks a bunch.

Randall H. Carpenter

-----Original Message-----
From: Marie Vihonsky [mailto:[email protected]]
Sent: Wednesday, February 19, 2003 10:28 PM
To: [email protected]
Subject: Re: TZF - TTzVFile anomaly


Hi Randy,

I made some changes to your unit.  I have never had success with using 
the 'post' and 'insert' and 'delete' functions.  I usually revert to the 
Topaz commands of 'appendrec','replacerec' and 'deleterec'.  I'm using 
D5, which didn't have the 'Varients' unit, so I removed it to get it to 
work.  I also usually add a Tznavigator component and use its commands 
for inserting & posting since I also make my own buttons for those 
commands.  I also make one procedure to 'ToggleButtons' on the form 
instead of referring to them separately:

Procedure TForm1.ToggleButtons;
begin
      addbutton.enabled := not addbutton.enabled;
      deletebutton.enabled := not deletebutton.enabled;
end;

I forgot to rename the actual unit, so be careful when you unzip it.

Marie

Randall H. Carpenter wrote:
> If anyone can shed some light on this anomaly, I'd appreciate it. 
>  
> Please check out the attached code.  I have come across an anomaly with 
> the TTzVFile component which is causing me heartburn.  Maybe it's my 
> code so I'm hoping you can give me some direction. 
>  
> In this example, I have a grid, a datasource, a TTzVFile, and three 
> buttons on a form.  Event handlers have been coded for the AfterCancel, 
> AfterEdit, AfterPost, and AfterScroll events of the TTzVFile component. 
>  
> In the AfterScroll event, which fires when the record pointer moves, the 
> Enabled property of the Delete and Mortgagee buttons are changed.  
> Sometimes this isn't happening.
>  
> To see what I am experiencing, try the following:
>  
> Compile/Run the program
> Click Add
> Enter 1 in the Location field
> Click Post
> Click Add
> Enter 2 in the Location field
> Click Post
> Click Add
> Enter 3 in the Location field
> Click Post
> Click Delete
> Click Yes
> Click Delete
> Click Yes
> Click Delete
> Click Yes
>  
> The Delete and the Mortgagee buttons are updated correctly (enabled := 
> false).
>  
> Now try this:
>  
> Compile/Run the program
> Click Add
> Enter 1 in the Location field
> Click Post
> Click Add
> Enter 2 in the Location field
> Click Post
> Click Add
> Enter 3 in the Location field
> Click Post
> Select the first record in the grid by either scrolling to it or 
> clicking on it.
> Click Delete
> Click Yes
> Click Delete
> Click Yes
> Click Delete
> Click Yes
>  
> The Delete and the Mortgagee buttons did not get updated.  They should 
> be disabled.
>  
> Any suggestions?
>  
> Your help will be appreciated.
>  
> Randall H. Carpenter

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