"Lloyd Sheen" <a@b.c> wrote in message
news:#R71LRP$JHA.4560@TK2MSFTNGP05.phx.gbl...
>
> "roidy" <r*@nnnnnn.com> wrote in message
> news:vCN3m.23213$AX1.16880@newsfe20.ams2...
>> How do I detect when a user scrolls a ListView control?
>>
>> Thanks
>> Rob
>
> You need to create a usercontrol derived from the listview.  In this
> control you will override the WndProc and raise an event when the
> WM_VSCROLL is sent.
>
> Follow these steps:
>
> 1.    Add a new usercontrol and call it something like MyListView
> 2.    In the MyListView.Designer.vb file change the inherits clause to:
>            Inherits System.Windows.Forms.ListView
>       As soon as you have done that you will see errors in the
> InitializeComponent sub.  Just comment or delete those two lines
>
> 3.    In the code file for MyListView use the following code:
>
> Public Class MyListView
> Public Event ProcMsg(ByVal m As Message)
> Public Const WM_VSCROLL As Integer = 277
>
> Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
>  Select Case m.Msg
>   Case WM_VSCROLL
>    RaiseEvent ProcMsg(m)
>  End Select
>  MyBase.WndProc(m)
> End Sub
> End Class
>
> 4.    Build your project , this will add the MyListView control to the
> toolbox.
>
> 5.    Now add a MyListView control to your form.
>
> 6.    Add code to handle the ProcMsg event.  Since you didn't say what you
> were going to do when this occurred this is where I stop.
>
> Hope this helps
> LS

"roidy" <r*@nnnnnn.com> wrote in message
news:GlR3m.25264$VX3.19108@newsfe14.ams2...
> Thanks Lloyd,
>
> Basically my application displays a listview with 2 columns, when the user
> selects a row the second column has a combobox overlaid  on top of it so
> the user can make a selection from it. Now if the user scrolls the
> listview I need to remove the combobox because it will no longer lineup
> with the selected row.
>
> I`m at step 6 in your explanation all I need to do is detect when the
> scroll bar is moved. I just dont know how to handle the ProcMsg event.
>
> Again thanks for the easy to follow explanation.
>
> Rob
>
> "Lloyd Sheen" <a@b.c> wrote in message
> news:#R71LRP$JHA.4560@TK2MSFTNGP05.phx.gbl...
>>
>> "roidy" <r*@nnnnnn.com> wrote in message
>> news:vCN3m.23213$AX1.16880@newsfe20.ams2...
>>> How do I detect when a user scrolls a ListView control?
>>>
>>> Thanks
>>> Rob
>>
>> You need to create a usercontrol derived from the listview.  In this
>> control you will override the WndProc and raise an event when the
>> WM_VSCROLL is sent.
>>
>> Follow these steps:
>>
>> 1.    Add a new usercontrol and call it something like MyListView
>> 2.    In the MyListView.Designer.vb file change the inherits clause to:
>>            Inherits System.Windows.Forms.ListView
>>       As soon as you have done that you will see errors in the
>> InitializeComponent sub.  Just comment or delete those two lines
>>
>> 3.    In the code file for MyListView use the following code:
>>
>> Public Class MyListView
>> Public Event ProcMsg(ByVal m As Message)
>> Public Const WM_VSCROLL As Integer = 277
>>
>> Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
>>  Select Case m.Msg
>>   Case WM_VSCROLL
>>    RaiseEvent ProcMsg(m)
>>  End Select
>>  MyBase.WndProc(m)
>> End Sub
>> End Class
>>
>> 4.    Build your project , this will add the MyListView control to the
>> toolbox.
>>
>> 5.    Now add a MyListView control to your form.
>>
>> 6.    Add code to handle the ProcMsg event.  Since you didn't say what
>> you were going to do when this occurred this is where I stop.
>>
>> Hope this helps
>> LS
>

"Lloyd Sheen" <a@b.c> wrote in message
news:eF50TGR$JHA.1380@TK2MSFTNGP02.phx.gbl...
>
> "roidy" <r*@nnnnnn.com> wrote in message
> news:GlR3m.25264$VX3.19108@newsfe14.ams2...
>> Thanks Lloyd,
>>
>> Basically my application displays a listview with 2 columns, when the
>> user selects a row the second column has a combobox overlaid  on top of
>> it so the user can make a selection from it. Now if the user scrolls the
>> listview I need to remove the combobox because it will no longer lineup
>> with the selected row.
>>
>> I`m at step 6 in your explanation all I need to do is detect when the
>> scroll bar is moved. I just dont know how to handle the ProcMsg event.
>>
>> Again thanks for the easy to follow explanation.
>>
>> Rob
>>
>> "Lloyd Sheen" <a@b.c> wrote in message
>> news:#R71LRP$JHA.4560@TK2MSFTNGP05.phx.gbl...
>>>
>>> "roidy" <r*@nnnnnn.com> wrote in message
>>> news:vCN3m.23213$AX1.16880@newsfe20.ams2...
>>>> How do I detect when a user scrolls a ListView control?
>>>>
>>>> Thanks
>>>> Rob
>>>
>>> You need to create a usercontrol derived from the listview.  In this
>>> control you will override the WndProc and raise an event when the
>>> WM_VSCROLL is sent.
>>>
>>> Follow these steps:
>>>
>>> 1.    Add a new usercontrol and call it something like MyListView
>>> 2.    In the MyListView.Designer.vb file change the inherits clause to:
>>>            Inherits System.Windows.Forms.ListView
>>>       As soon as you have done that you will see errors in the
>>> InitializeComponent sub.  Just comment or delete those two lines
>>>
>>> 3.    In the code file for MyListView use the following code:
>>>
>>> Public Class MyListView
>>> Public Event ProcMsg(ByVal m As Message)
>>> Public Const WM_VSCROLL As Integer = 277
>>>
>>> Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
>>>  Select Case m.Msg
>>>   Case WM_VSCROLL
>>>    RaiseEvent ProcMsg(m)
>>>  End Select
>>>  MyBase.WndProc(m)
>>> End Sub
>>> End Class
>>>
>>> 4.    Build your project , this will add the MyListView control to the
>>> toolbox.
>>>
>>> 5.    Now add a MyListView control to your form.
>>>
>>> 6.    Add code to handle the ProcMsg event.  Since you didn't say what
>>> you were going to do when this occurred this is where I stop.
>>>
>>> Hope this helps
>>> LS
>>
>
> Are you saying you cannot capture the ProcMsg event.  Once you have built
> the project once the ProcMsg event will show in the Properties / Events
> window so you can attach an event handler to it.  Sample code that I used
> to make sure this works is (the code in the sub was just there to confirm
> the message was being captured):
>
> Private Sub MyListView1_ProcMsg(ByVal m As System.Windows.Forms.Message)
> Handles MyListView1.ProcMsg
>
> This is where you would most likely set the combobox visible to false.
>
>  Try
>   Dim li As New ListViewItem("Scrolling " + m.Msg.ToString)
>   Me.ListView1.Items.Add(li)
>   li.EnsureVisible()
>  Catch ex As Exception
>  End Try
> End Sub
>