Yes, could do that, with the understanding that it will result in some
extra overhead due to fetching two lots of child records if I don't
detect which is the last non-nil item notified. That's what I meant by
"messy".
From: robo...@gmail.com
Date: Sun, 27 Jul 2014 20:57:40 +0200
To: delphi@listserver.123.net.nz
Subject: Re: [DUG] ListView - Scroll Event
So you just need to use the OnChange event, and check the item is not nil. From
memory I don't think you need to check whether item is different to previous
item.
Robo
On Sun, Jul 27, 2014 at 8:52 PM, Eric A <eaa...@hotmail.com> wrote:
Yes, multiple OnChange events are generated on the ListView control, for
both mouse clicks and navigation key depressions, as follows:
a) First mouse click or down arrow/PgDn key depression:
- Item = new selection
b) subsequent mouse clicks or down arrow/PgDn key depressions:
- Item - current selection
- Item= nil
- Item = new selection
Seems messy ...
From: robo...@gmail.com
Date: Sun, 27 Jul 2014 12:28:33 +0200
To: delphi@listserver.123.net.nz
Subject: Re: [DUG] ListView - Scroll Event
>From memory, when a record changes, first an event gets fired where selected
>item is nil, then a second event gets fire where selected item is the new item.
On Sun, Jul 27, 2014 at 11:07 AM, Eric A <eaa...@hotmail.com> wrote:
(Delphi 7)
I wish to detect the user selecting a row (item) in a ListView component to
display child records for the item in another control.
There is no "OnScroll" event for this control. I can use the "OnClick" event
OK for a selection cia the mouse, but how do I detect when a user scrolls on to
a record by using the arrow keys (or PgUp, PgDn or moving the scrollbar ?
I have tried the using the OnChange event but it seems that there are two
events generated for each movement by the arrow keys.
Does anyone have a code snippet to accomplish this?
Eric.
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