Control Flickering (Listview)

Well if you are updateing the screen that many columns that often then flickering is going to be hard to avoid, you can lessen it by only changing the bits that have changed and avoiding clearing it and recreateing it all the time. If you example if you move a the creation bit to the start button ie...

    Dim I As Integer
    For I = 1 To 30
        ListView1.ListItems.Add I, , , , 1
        ListView1.ListItems(I).SubItems(1) = Timer
        ListView1.ListItems(I).SubItems(2) = Date
        ListView1.ListItems(I).SubItems(3) = Time
    Next I
    Timer1.Enabled = True
    Timer1.Interval = Val(Trim(Text1.Text))
End Sub

Which is basically just initialising the listview, then in the timer have something similar to ...

Private Sub Timer1_Timer()
    'LockWindowUpdate Me.hwnd
    'ListView1.ListItems.Clear
    Dim I As Integer
    For I = 1 To 30
        ListView1.ListItems(I).SubItems(1) = Timer
        If ListView1.ListItems(I).SubItems(2) <> Date Then ListView1.ListItems(I).SubItems(2) = Date
        If ListView1.ListItems(I).SubItems(3) <> Time Then ListView1.ListItems(I).SubItems(3) = Time
    Next I
    'LockWindowUpdate False
End Sub

In this example (least on my machine) the lockwindowupdate does little to remove the flickering, but if you are making large changes in bursts then I guess it would help more.

Basically avoid rewriting anything that doesn't need to be rewritten and you will avoid alot of flickering. I know this won't eliminate everything in your example, bt hopefully it will help.

OK, thanks, but still going to keep this open for more input.

The problem is, the app that im using this on i never know what the sze of the list is going to be, so in my case i just need to clear the list and refresh, i suppose i can re-write the code like you suggest wich may not be a bad thing at all, however i just want other ides if any exist (my doubts thogh that any more exist)

Bill.

Can you not add and remove the additional entries as you get them?

If you are pulling them from a database is there a unique field (primary or foriegn key) that you can place in the key field of the listview which will allow you to check for new entries?

If you clear and rebuild the list every time it will be almost impossible to avoid the flickering, at least in my experience so far.

Not really, it will be hard to do this because as i get the info from the db i need to update the list acording to how the user has it sorted.

Thank you, im sorry i don't have more points, its really nice of you to help.

Not a problem, I participate here to increase my skills and knowledge not to get a high score :-D

Ok, can you change the icons every other time (or on a random time) and see if it flickers?  It is doing it for one of my apps.

Hmm, yep, noticable flicker when changing lots of icons, looks like it is rebuilding the entire line when the icon is changed.
Not been able to reduce it my end though. How often are you changing the icons?

every second