Jason, I can create a test-app to demonstrate the behaviour, if you are interested.

Guido

guido.klapperich@... wrote:

> After some testing I found out, that the OnDataChange-Event doesn't fire only, when
> KeyDescLinks is not empty.
> Any ideas ?
>
> Guido
>
> guido.klapperich@... wrote:
>
> > > Not sure what would have caused this.
> > > Not sure what could reverse it either.
> > > Perhaps you could give more details.
> > > There is probably a better way to do what you are doing.
> > >
> >
> > I have a query ACQuery with 'select ACATID,.... from activities', ACATID is a
> > FK. ACATID can be changed with a Lookup-Query , which is linked to a
> > LookupCombo. In the OnDataChange-Event of the DataSource of ACQuery I ask
> > if Assigned(Field) then
> > if Field.FieldName='ACATID' then
> > do something
> >
> > In the older versions of IBO this worked fine, but now (IBO 4.2 Fr) the
> > OnDataChange-Event doesn't fire, when I change ACATID. I looked in the
> > Release-Notes and I found this at release 4.2Fn:
> > I made it so that the OnDataChange events when doing column modifications would
> > distinguish between a direct assignment and an Assign() initiated assignment. I
> > made it so that when directly assigning a new value it would always announce a
> > datachange notification, whether or not the data value was actually changed.
> > Only the Assign() will suppress announcement of an OnDataChange notification
> > when the values are the same. This is important to have since the master-detail
> > linking relies upon it reaching a point that there are no longer any binary
> > differences between the linking columns. If there were differences or perpetual
> > announcement of data change events there would be an infinite looping, as was
> > the case in recent sub-releases where trying to keep the link between master and
> > detail perfectly accurate when using callbacks. Keep in mind, callbacks are off
> > by default for TDataset based stuff so this was only an issue to those using
> > callback support, which is a nice luxury now ready for the prime time in the
> > native IBO components and controls. I'd still be hesitant to turn them on in
> > TDataset based components.
> >
> > Is this the reason for the new behaviour ?
> >
> > Guido
> >
> >
> > ___________________________________________________________________________
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>
> ___________________________________________________________________________
> IB Objects - direct, complete, custom connectivity to Firebird or InterBase
> without the need for BDE, ODBC or any other layer.
> ___________________________________________________________________________
> http://www.ibobjects.com - your IBO community resource for Tech Info papers,
> keyword-searchable FAQ, community code contributions and more !
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/