Solved

Move Items Up & Down In a Listbox (VB.Net)

Posted on 2003-10-23
5
1,354 Views
Last Modified: 2008-07-08
I have a listbox with values and 2 buttons(UP & DOWN) to the side of it. Where a user can change the order of the values. I have been fooling around with it and can't get it to work. If they have an item selected and they keep pressing the UP button the item should move closer to the top.

Any help would be appreciated

0
Comment
Question by:idalton
5 Comments
 
LVL 1

Accepted Solution

by:
johan_asplund earned 50 total points
ID: 9609217
Hello

I just made a small example that you can try

    Private Sub btnUp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUp.Click

        Dim item As Object
        Dim index As Integer
        item = ListBox1.SelectedItem()
        index = ListBox1.Items.IndexOf(item)

        ListBox1.Items.Insert(index - 1, item)
        ListBox1.SelectedIndex = index - 1
        ListBox1.Items.RemoveAt(index + 1)


    End Sub

    Private Sub btnDown_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDown.Click
        Dim item As Object
        Dim index As Integer
        item = ListBox1.SelectedItem()
        index = ListBox1.Items.IndexOf(item)

        ListBox1.Items.Insert(index + 2, item)
        ListBox1.SelectedIndex = index + 2
        ListBox1.Items.RemoveAt(index)


    End Sub



Br
Johan
1
 
LVL 7

Expert Comment

by:Joe_Griffith
ID: 9610323
Here's what I do...

Note that I've filled the list box with objects of type clsSpListItem and the listbox in question is named lst.  

  Private Sub rptUp_Fire() Handles rptUp.Click
    Dim i As Integer
    Dim pi_Index As Integer
    Dim po_ListItem As clsSpListItem

    i = lst.SelectedIndex
    If i < 0 Then Exit Sub
    po_ListItem = CType(lst.Items(lst.SelectedIndex), clsSpListItem)

    i = i - 1
    If i >= 0 Then
      lst.Items.RemoveAt(lst.SelectedIndex)
      lst.Items.Insert(i, po_ListItem)
      lst.SelectedIndex = i
    Else
      Beep()
    End If
  End Sub

  Private Sub rptDown_Fire() Handles rptDown.Click
    Dim i As Integer
    Dim po_listitem As clsSpListItem

    i = lst.SelectedIndex
    If i < 0 Then Exit Sub
    po_listitem = CType(lst.Items(lst.SelectedIndex), clsSpListItem)

    i = i + 1
    If i <= lst.Items.Count - 1 Then
      lst.Items.RemoveAt(lst.SelectedIndex)
      lst.Items.Insert(i, po_listitem)
      lst.SelectedIndex = i
    Else
      Beep()
    End If
  End Sub
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 10224304
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: johan_asplund {http:#9609217}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

TheLearnedOne
EE Cleanup Volunteer
0
 

Expert Comment

by:ScottG_Work
ID: 21956937
I wanted to stop and take a few minutes to modify the above code  by Joe Griffith.  I searched for a while until I found this solution.  I have modified his code to allow both drag and drop features and well as changing the position of the item with the Up/Down Buttons.  Make sure that you set the .AllowDrop property of listbox1 to True and you should be in good shape.  This code also checks to make sure that an item is selected and that the index is within bounds of the total item count.  Thanks again to the original poster for this solution... :)

    Private Sub ListBox1_DragDrop(ByVal sender As Object, ByVal e As _ System.Windows.Forms.DragEventArgs) Handles ListBox1.DragDrop

        ListBox1.Items.Insert(ListBox1.IndexFromPoint (ListBox1.PointToClient(New Point(e.X, e.Y))), e.Data.GetData _(DataFormats.Text))

        ListBox1.Items.RemoveAt(ListBox1.SelectedIndex)

    End Sub
 

    Private Sub ListBox1_DragOver(ByVal sender As Object, ByVal e As _ System.Windows.Forms.DragEventArgs) Handles ListBox1.DragOver

        e.Effect = DragDropEffects.Move

    End Sub
 

    Private Sub ListBox1_MouseDown(ByVal sender As Object, ByVal e As _ System.Windows.Forms.MouseEventArgs) Handles ListBox1.MouseDown

        ListBox1.DoDragDrop(ListBox1.Text, DragDropEffects.All)

    End Sub

    Private Sub btnUp_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles btnUp.Click
 

        Dim item As Object

        Dim index As Integer

        If ListBox1.SelectedItem <> Nothing Then

            item = ListBox1.SelectedItem()

            index = ListBox1.Items.IndexOf(item)
 

            If index <> 0 Then

                ListBox1.Items.Insert(index - 1, item)

                ListBox1.SelectedIndex = index - 1

                ListBox1.Items.RemoveAt(index + 1)

            End If

        End If
 

    End Sub
 

    Private Sub btnDown_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles btnDown.Click

        Dim item As Object

        Dim index As Integer

        If ListBox1.SelectedItem <> Nothing Then

            item = ListBox1.SelectedItem()

            index = ListBox1.Items.IndexOf(item)
 

            If index <> ListBox1.Items.Count - 1 Then

                ListBox1.Items.Insert(index + 2, item)

                ListBox1.SelectedIndex = index + 2

                ListBox1.Items.RemoveAt(index)

            End If

        End If

    End Sub

Open in new window

0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Summary Displaying images in RichTextBox is a common requirement with limited solutions available. Pasting through clipboard or embedding into RTF content only support static images.  This article describes how to insert Windows control objects int…
In my previous two articles we discussed Binary Serialization (http://www.experts-exchange.com/A_4362.html) and XML Serialization (http://www.experts-exchange.com/A_4425.html). In this article we will try to know more about SOAP (Simple Object Acces…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This tutorial demonstrates a quick way of adding group price to multiple Magento products.

744 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now