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TreeView and FullRowSelect question

rh
I created a user control that is made up of a TreeView and a VScrollBar. I
set the TreeView.FullRo wSelect = True and it works as expected (full row is
visible, appears on top of everything else) but only sometimes. Other times
it appears behind the parent form and all that is visible is the last few
characters of that row.

Anyone know what might be causing this and how I can fix it? Thanks.
Nov 17 '05 #1
5 3906
rh,

What do you mean by it appears behind the parent form? That says to me
that you can't see the tree view at all.

Can you post a picture of what you mean, or some code that shows the
error (or an example we can run)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:uq******** ******@tk2msftn gp13.phx.gbl...
I created a user control that is made up of a TreeView and a VScrollBar. I
set the TreeView.FullRo wSelect = True and it works as expected (full row is
visible, appears on top of everything else) but only sometimes. Other times
it appears behind the parent form and all that is visible is the last few
characters of that row.

Anyone know what might be causing this and how I can fix it? Thanks.

Nov 17 '05 #2
rh,

I see the image, but I am not sure what you want. The selection crosses
the full length of the control. How much longer do you want it to extend?

Or do you mean the tool tip is showing up behind the form? I think that
is what you are referring to.

Is your app stand-alone (meaning no special database stuff, supporting
files, etc, etc). If so, can you post it?

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:eh******** ******@TK2MSFTN GP12.phx.gbl...
Please refer to the attached JPG image. Let me know if you also need the
see the code.

Thanks for any help.

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..
rh,

What do you mean by it appears behind the parent form? That says to
me
that you can't see the tree view at all.

Can you post a picture of what you mean, or some code that shows the
error (or an example we can run)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:uq******** ******@tk2msftn gp13.phx.gbl...
I created a user control that is made up of a TreeView and a VScrollBar.
I
set the TreeView.FullRo wSelect = True and it works as expected (full row
is
visible, appears on top of everything else) but only sometimes. Other
times
it appears behind the parent form and all that is visible is the last few
characters of that row.

Anyone know what might be causing this and how I can fix it? Thanks.



Nov 17 '05 #3
Just for grins, try calling the forms Refresh and/or Invalidate methods when
you select a node. I believe it's the treeview's AfterSelect event.

Yosh


"rh" <rh******@smci. com> wrote in message
news:eh******** ******@TK2MSFTN GP12.phx.gbl...
Please refer to the attached JPG image. Let me know if you also need the
see the code.

Thanks for any help.

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..
rh,

What do you mean by it appears behind the parent form? That says to
me
that you can't see the tree view at all.

Can you post a picture of what you mean, or some code that shows the
error (or an example we can run)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:uq******** ******@tk2msftn gp13.phx.gbl...
I created a user control that is made up of a TreeView and a VScrollBar.
I
set the TreeView.FullRo wSelect = True and it works as expected (full row
is
visible, appears on top of everything else) but only sometimes. Other
times
it appears behind the parent form and all that is visible is the last few
characters of that row.

Anyone know what might be causing this and how I can fix it? Thanks.



Nov 17 '05 #4
rh
Yes, I am referring to the Tool Tip showing up behind the form instead of in
front of the form.

I tried recreating the code in order to make it stand alone so I can post
it, but the problem doesn't occur with my recreated code. I'll post the full
code as soon as I can.

For now, here's the code for the TreeView that I use:

Option Strict On

Option Explicit On

Imports System.Windows. Forms

Namespace SMCI.Common.UI

Public Class SMCITreeView

Inherits TreeView

Private Const SIF_DISABLENOSC ROLL As Long = &H8& '8

Private Const SIF_PAGE As Long = &H2&

Private Const SIF_POS As Long = &H4&

Private Const SIF_RANGE As Long = &H1&

Private Const SIF_TRACKPOS As Long = &H10& '10

Private Const SIF_ALL As Long = SIF_RANGE Or SIF_PAGE Or SIF_POS Or
SIF_TRACKPOS

Private Const SBS_HORZ As Long = 0

Private Const SBS_VERT As Long = 1

Private Const WM_VSCROLL As Int32 = &H115

Private Const SB_THUMBPOSITIO N As Long = 4 ' &H4 'after mouse up

Private pnScrollPage As Integer ' Same as LargeChange

Private pnScrollPos As Integer

Private pnScrollMin As Integer

Private pnScrollMax As Integer

Public IsVScrollVisibl e As Boolean

Public IsHScrollVisibl e As Boolean

'Public IsInitComplete As Boolean

' Events

Public Event ScrollChanged()

Public Event VScrollVisibleC hanged(ByVal tlVisible As Boolean)

Public Event HScrollVisibleC hanged(ByVal tlVisible As Boolean)

Public Structure SCROLLINFO

Public cbSize As Integer

Public fMask As Integer

Public nMin As Integer

Public nMax As Integer

Public nPage As Integer

Public nPos As Integer

Public nTrackPos As Integer

End Structure

Declare Function GetScrollInfo Lib "user32" (ByVal hWnd As IntPtr, ByVal
nBar As Integer, _

ByRef lpScrollInfo As SCROLLINFO) As Integer

Declare Auto Function SendMessage Lib "User32" (ByVal hwnd As System.IntPtr,
ByVal msg As Int32, _

ByVal wParams As Int64, ByVal lParams As Int32) As Long

Public ReadOnly Property ScrollPage() As Integer

Get

Return Me.pnScrollPage

End Get

End Property

Public ReadOnly Property ScrollPos() As Integer

Get

Return Me.pnScrollPos

End Get

End Property

Public ReadOnly Property ScrollMin() As Integer

Get

Return Me.pnScrollMin

End Get

End Property

Public ReadOnly Property ScrollMax() As Integer

Get

Return Me.pnScrollMax

End Get

End Property

Public Sub ScrollWindow(By Val tnChange As Integer)

Dim lnPosition As Integer = Me.ScrollPos + tnChange

If lnPosition < 0 Then

lnPosition = 0

ElseIf lnPosition > Me.ScrollMax - Me.ScrollPage + 1 Then

lnPosition = Me.ScrollMax - Me.ScrollPage + 1

End If

' Call SendMessage() to simulate movement of the ScrollBar (Reference:
http://www.vbcity.com/forums/topic.asp?tid=55822)

SendMessage(Me. Handle, WM_VSCROLL, SB_THUMBPOSITIO N + &H10000 * lnPosition,
Nothing)

End Sub

Private Sub MyTreeView_Resi ze(ByVal sender As Object, ByVal e As
System.EventArg s) Handles MyBase.Resize

' NOTE: Don't do anything with this event

' The below code causes the FullRowSelect property to not work properly

' So comment it out

'Me.RefreshScro llBarData()

End Sub

' Overriding WndProc() will allow you to intercept all of the messages

' that pass through the control. Use it to catch the scrolling events.

Protected Overrides Sub WndProc(ByRef m As System.Windows. Forms.Message)

MyBase.WndProc( m)

' This raises the ScrollChanged() event if any scroll action occurs,

' which keeps the custom ScrollBar with the TreeView's ScrollBar in sync

Me.RefreshScrol lBarData()

End Sub

' Call this function to keep the custom ScrollBar with the TreeView's
ScrollBar in sync

Public Function RefreshScrollBa rData() As SCROLLINFO
' Horizontal Scroll

Dim loHSI As New SCROLLINFO

loHSI.fMask = Me.SIF_ALL ' Set the fMask member to specify the scroll bar
parameters to retrieve

If GetScrollInfo(M e.Handle, Me.SBS_HORZ, loHSI) = 0 Then ' Non-zero
indicates success

If Me.IsHScrollVis ible = True Then

RaiseEvent HScrollVisibleC hanged(False)

Me.IsHScrollVis ible = False

End If

Else

If loHSI.nPage > 0 And loHSI.nMax > 0 Then ' nPage must be > 0 for the
ScrollBar to be visible

If Me.IsHScrollVis ible = False Then

RaiseEvent HScrollVisibleC hanged(True)

Me.IsHScrollVis ible = True

End If

Else

If Me.IsHScrollVis ible = True Then

RaiseEvent HScrollVisibleC hanged(False)

Me.IsHScrollVis ible = False

End If

End If

End If

' Vertical Scroll

Dim loVSI As New SCROLLINFO

loVSI.fMask = SIF_ALL

If GetScrollInfo(M e.Handle, SBS_VERT, loVSI) = 0 Then

If Me.IsVScrollVis ible Then

RaiseEvent VScrollVisibleC hanged(False) ' Visibility has changed: True ->
False, raise event

Me.IsVScrollVis ible = False

End If

Else

Dim llRaiseScrollCh anged As Boolean = False

If loVSI.nPos <> Me.ScrollPos OrElse loVSI.nMax <> Me.ScrollMax OrElse
loVSI.nPage <> Me.ScrollPage Then

llRaiseScrollCh anged = True ' Raise the ScrollChanged event if one of the
values have changed

End If

' Set the ScrollBar properties ---

Me.pnScrollPos = loVSI.nPos

Me.pnScrollPage = loVSI.nPage

Me.pnScrollMin = loVSI.nMin

Me.pnScrollMax = loVSI.nMax

'---------------------------------

If Me.ScrollMin = 0 AndAlso Me.ScrollMax = 0 Then

If Me.IsVScrollVis ible Then

RaiseEvent VScrollVisibleC hanged(False) ' Visibility has changed: True ->
False, raise event

Me.IsVScrollVis ible = False

End If

Else

If Me.IsVScrollVis ible = False Then

If loVSI.nPage > 0 And loVSI.nMax > 0 Then ' nPage must be > 0 for the
ScrollBar to be visible

RaiseEvent VScrollVisibleC hanged(True) ' Visibility has changed: False ->
True, raise event

Me.IsVScrollVis ible = True

End If

End If

If llRaiseScrollCh anged Then

RaiseEvent ScrollChanged() ' Scroll values have changed, raise this event

End If

End If

End If

End Function

End Class

End Namespace

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:uk******** *****@TK2MSFTNG P15.phx.gbl...
rh,

I see the image, but I am not sure what you want. The selection
crosses the full length of the control. How much longer do you want it to
extend?

Or do you mean the tool tip is showing up behind the form? I think
that is what you are referring to.

Is your app stand-alone (meaning no special database stuff, supporting
files, etc, etc). If so, can you post it?

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:eh******** ******@TK2MSFTN GP12.phx.gbl...
Please refer to the attached JPG image. Let me know if you also need the
see the code.

Thanks for any help.

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..
rh,

What do you mean by it appears behind the parent form? That says to
me
that you can't see the tree view at all.

Can you post a picture of what you mean, or some code that shows the
error (or an example we can run)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:uq******** ******@tk2msftn gp13.phx.gbl...
I created a user control that is made up of a TreeView and a VScrollBar.
I
set the TreeView.FullRo wSelect = True and it works as expected (full row
is
visible, appears on top of everything else) but only sometimes. Other
times
it appears behind the parent form and all that is visible is the last
few
character s of that row.

Anyone know what might be causing this and how I can fix it? Thanks.



Nov 17 '05 #5
rh
Ok, so calling the Refresh and/or Invalidate had no effect. But, it gave me
the idea of trying other methods and I found that calling the forms Hide and
Show methods at the end of my code solves the problem (for whatever reason).
Thanks!
"Yosh" <yo***@nospam.c om> wrote in message
news:OB******** ******@TK2MSFTN GP12.phx.gbl...
Just for grins, try calling the forms Refresh and/or Invalidate methods
when you select a node. I believe it's the treeview's AfterSelect event.

Yosh


"rh" <rh******@smci. com> wrote in message
news:eh******** ******@TK2MSFTN GP12.phx.gbl...
Please refer to the attached JPG image. Let me know if you also need the
see the code.

Thanks for any help.

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..
rh,

What do you mean by it appears behind the parent form? That says to
me
that you can't see the tree view at all.

Can you post a picture of what you mean, or some code that shows the
error (or an example we can run)?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"rh" <rh******@smci. com> wrote in message
news:uq******** ******@tk2msftn gp13.phx.gbl...
I created a user control that is made up of a TreeView and a VScrollBar.
I
set the TreeView.FullRo wSelect = True and it works as expected (full row
is
visible, appears on top of everything else) but only sometimes. Other
times
it appears behind the parent form and all that is visible is the last
few
character s of that row.

Anyone know what might be causing this and how I can fix it? Thanks.



Nov 17 '05 #6

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