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Find the scroll position

Posted on 2012-03-18
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Last Modified: 2012-06-27
Asume you have a panel that sometimes is to wide for the available visibel area. When that happens a horisontal scrollbar apears at the bottom of the panel. The panels AutoScroll property is True.

Inside the panel there is another control that needs to always position itself in the middle of the visibel area of the panel when it is being scrolled.

I have been Googling around a bit and it seams this is quite complicated.

Can someone just give me a simple example code for how to obtain the Controls new X cordinate from the panel's current scroll position.
Please also state where this code should be added.

Or can this be done by some inbuilt functions like docking? (Docking does't seam to be able to do this.)
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Question by:daghoff
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3 Comments
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 37734862
Try something like this:
Public Class Form1

    Private Sub Form1_Shown(sender As System.Object, e As System.EventArgs) Handles MyBase.Shown
        CenterControl(Panel1, Label1)
    End Sub

    Private Sub Panel1_Resize(sender As Object, e As System.EventArgs) Handles Panel1.Resize
        CenterControl(Panel1, Label1)
    End Sub

    Private Sub Panel1_Scroll(sender As System.Object, e As System.Windows.Forms.ScrollEventArgs) Handles Panel1.Scroll
        CenterControl(Panel1, Label1)
    End Sub

    Private Sub CenterControl(ByVal pnl As Panel, ByVal ctl As Control)
        If Not IsNothing(pnl) AndAlso Not IsNothing(pnl.Parent) AndAlso Not IsNothing(ctl) Then
            If pnl.IsHandleCreated AndAlso ctl.IsHandleCreated Then
                Dim CenterScreen As Point = pnl.Parent.PointToScreen(New Point(pnl.Bounds.Width / 2, pnl.Bounds.Height / 2))
                Dim CenterClient As Point = pnl.PointToClient(CenterScreen)
                CenterClient.Offset(-ctl.Width / 2, -ctl.Height / 2)
                ctl.Location = CenterClient
            End If
        End If
    End Sub

End Class

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Author Comment

by:daghoff
ID: 37737070
Thanx Idle_Mind, it works.

But initially I only wanted this repositioning to the midle of the visibel area to occure when scrollbars have apeared in the panel. If scrollbars are not there I will position it myself.

Is there a way to detect if vertical or horisontal scrollbars has become visible in the panel?
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LVL 86

Accepted Solution

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Mike Tomlinson earned 2000 total points
ID: 37737369
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