How to disable fiew items in Listview?

[kaisersoze]

How to disable fiew items and enable fiew items based on a fireld value in Listview?

[AlexCode]

As for TreeView I like to create my own items.

This way I can have a better control of what will happen.

 

Tho you have 2 options:

 

1. Item text based recognition

Just add the items you want to the ListView and, on the ListView's SelectedIndexChanged Event, do the following:

 

   Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged
       Select Case Me.ListView1.SelectedItems(0).Text
           Case "AAA"
                'Do something 
           Case "BBB"
                'Do something 
       End Select
   End Sub

 

2. Inner Item handle

This is a more 'PRO' approach, it may suite you on other, more complex, issues (I believe this is not the case).

Just create as many custom ListViewItems as task you want to perform and add them to the ListView.

Each of these custom items will "know" how to perform their task.

See the example bellow:

   Public MustInherit Class BaseCustomNode
       Inherits ListViewItem

       'Implement only the contructors you need.
       Public Sub New(ByVal text As String, ByVal imageindex As Integer)
           Me.Text = text
           Me.ImageIndex = imageindex
       End Sub

       Public MustOverride Sub ExecuteTask() 'May have arguments

   End Class
   Public Class CustomItem1
       Inherits BaseCustomNode

       Public Sub New(ByVal text As String, ByVal imageindex As Integer)
           MyBase.New(text, imageindex)
       End Sub

       Public Overrides Sub ExecuteTask()
           'Execute this items code
       End Sub
   End Class
   Public Class CustomItem2
       Inherits BaseCustomNode

       Public Sub New(ByVal text As String, ByVal imageindex As Integer)
           MyBase.New(text, imageindex)
       End Sub

       Public Overrides Sub ExecuteTask()
           'Execute this items code
       End Sub
   End Class

   'Assuming thet the ListView's parent form is Form1...
   Dim CItem1 As New CustomItem1("MyItem1", 0)
   Dim CItem2 As New CustomItem2("MyItem2", 1)
   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       Me.ListView1.Items.AddRange(New ListViewItem() {CItem1, CItem2})
   End Sub

   Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged
       CType(Me.ListView1.SelectedItems(0), BaseCustomNode).ExecuteTask()
   End Sub

 

 

Last Note:

 

I believe that my 1st option will suit your needs for this current task, but it's allways good to learn something ahead... :D

 

Alex :P

[AlexCode]

Just one more thing...

 

If have miss undetood you and you only want to desable the item on the listview, based on the items selection try to hide the items (remove them from the listview) instead of desable them...

 

ListViewItems Desabling insn't a standard functionality, so you would have to owner draw the item and implement some SelectIndexChanged functionality to the ListView itself...

 

Alex :p