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TListView virtual mode & Selected

Posted on 2002-05-23
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Last Modified: 2008-02-01
I have a TListView in virtual mode. I set the Selected property to an item outside the current listbox. If U scroll down the list I can see the new item selected ?_but_ how can I get the list box to automatically move it's view on the TCollection down to include the new selected (via code) item.

Thanks, Tom.
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Question by:tomcorcoran
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7 Comments
 
LVL 14

Expert Comment

by:DragonSlayer
ID: 7031077
try something like this?

ListView1.Items[myIndex].MakeVisible(False);

or

ListView1.TopItem := ListView1.Items[myIndex];
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LVL 20

Expert Comment

by:Madshi
ID: 7031201
I'm not sure whether the "Items" property works completely, when using virtual mode. I'm using the following function when doing virtual mode:

ListView_EnsureVisible

Regards, Madshi.
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LVL 14

Expert Comment

by:DragonSlayer
ID: 7031279
Hmm... yeah, forgot about that.

Didn't try it myself, but you just *might* get a List Index Out of Bounds error.

So Tom, Madshi is correct, just follow his suggestion and call it this way:

ListView_EnsureVisible(ListView1.Handle, myIndex, False);

and don't forget to add CommCtrl in your uses clause.

(PS: If this works, give the points to Madshi)
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Accepted Solution

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Madshi earned 50 total points
ID: 7031305
The Items stuff might work, too, sometimes it does work even in virtual mode. Just not sure...
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Author Comment

by:tomcorcoran
ID: 7031676
It turns out that
ListView1.Items[myIndex].MakeVisible(False);
is a wrap for
ListView_EnsureVisible(ListView1.Handle, myIndex, False);
so both work perfectly :-)
There doesn't seem to be any advantage to using the later.

FYI, ListView1.TopItem is readonly.

The selected index however shows at the bottom of the TListView and I want it toward the top. I want to do

ListView1.Items[myIndex+NumberItemsVisibleInList].MakeVisible(False);

Do ye have any idea how I can get
the number of items visible in the list?

Thanks a million, Tom.
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LVL 20

Expert Comment

by:Madshi
ID: 7032077
ListView_GetCountPerPage
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Author Comment

by:tomcorcoran
ID: 7041280
Thanks for you guys help. Great, Tom.
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