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Make Listview scroll down to selected item

Hi guys,

Assume that i have a listview with thousand of items..

What i want to do is let the Listview control auto scroll down to the selected item. (Make the listview scroll down itself so i can 'see' the selected item.)

Here is the code:

Private Const WM_VSCROLL = &H115
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Sub Command1_Click()
    Dim i As Long
    i = SendMessage(ListView1.hwnd, WM_VSCROLL, 0, ByVal CLng(Text1.Text))
End Sub

Private Sub Form_Load()
    For i = 1 To 250
        ListView1.ListItems.Add i, , i
        ListView1.ListItems(i).SubItems(1) = "Subitem " & i
    Next i
    Text1.Text = "25"
    Randomize
    Dim j As Long
    j = Int(Rnd * ListView1.ListItems.Count) + 1
    ListView1.ListItems(j).Selected = True
End Sub

What is less in this code above? What params should i use in SendMessage to do the tricks?

Reference: http://www.mvps.org/vbnet/code/subclass/lvscrollbars.htm

Any comments, resources or links? Thanks.
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Ryan Chong
Asked:
Ryan Chong
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1 Solution
 
Ryan ChongAuthor Commented:
Hi guys,

I add a for loop in order to do the tricks. As get the maximum items can be displayed , and divide it with the total items count:

If i > 21 Then
                Dim k As Integer
                For k = 1 To Int(i / 21)
                    j = SendMessage(LVIns.hwnd, WM_VSCROLL, 3, 0)
                Next k
            End If

Any alternative?
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JonFish85Commented:
try this:

Listview1.TopIndex = ListView1.SelectedItem.Index

hope this helps!
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vblogicCommented:
Listview.ListItems(i).EnsureVisible
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Ryan ChongAuthor Commented:
Hi JonFish85,

TopIndex property only available on List box control, NOT listview control, i think maybe you missread my question.

To vblogic,

You code works fine.
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JonFish85Commented:
I knew it worked in listbox, but I wasnt sure if listview had the same property, but I thought it worth a shot... sorry it didnt work :-/
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Ryan ChongAuthor Commented:
Hi JonFish85,

Unfortunately that listview don't have this property. It's ok : )

The ensurevisible method works fine for me, but if somebody can provides me a way to do same effect using API, points will be added.

Thanks Jon and vblogic.
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vblogicCommented:
Why use complicated API when ListView has built-in capability to achieve this effect?
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Ryan ChongAuthor Commented:
Hi vblogic,

Don't worry, the points are yours.

I just want to learn more on doing same thing using API, more fun, isn't it?! : )
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vblogicCommented:
I think its more headache!  j/k

But I dont know...your code looks ok to me, except that I think you may need to get handle to the scrollbar of the listview, and not the listview itself.
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Richie_SimonettiIT OperationsCommented:
hearing
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Ryan ChongAuthor Commented:
Can anyone show me the way to do this in API? or i will close this question.
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Richie_SimonettiIT OperationsCommented:
Since that control is created by API, i think that this site could give you a great clue:

http://www.mvps.org/btmtz/enumdeskvb/
http://www.mvps.org/btmtz/vbexplorer/
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Richie_SimonettiIT OperationsCommented:
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Richie_SimonettiIT OperationsCommented:
Maybe here (sorry, i have no time to test them by myself):
http://www.mvps.org/vbnet/index.html?code/subclass/lvscrollbars.htm

Hope it helps
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Richie_SimonettiIT OperationsCommented:
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Ryan ChongAuthor Commented:
Sorry for late reply, i will check them and reply soon..

Thanks Richie.
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Richie_SimonettiIT OperationsCommented:
You are welcome anytime ;)
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Ryan ChongAuthor Commented:
Hi vblogic,

Thanks for your help. But my problem is NOT solved yet..

To Richie,

Thanks to provide me some useful links, but still can not automatically scroll down the listview to selected item. Maybe no luck this time.

Anyway, thanks all to provide valuable comments.

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mbalsamCommented:
Try this
    ListView1.HideSelection = False
    ListView1.ListItems(x).Selected = True
    ListView1.ListItems(x+5).EnsureVisible

Mitch
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Ryan ChongAuthor Commented:
Welcome to EE, mbalsam.

Thanks for the comment but this question is already PAQ, so it's not worth to post any comment in this question anymore.

Instead, try help other people to solve their problem in:
http://www.experts-exchange.com/Programming/Programming_Languages/Visual_Basic/

cheers :)
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