Listbox - Moving Items Around - Xtreme Visual Basic Talk

06-13-2005, 05:32 PM

JustAdotNETUser JustAdotNETUser is offline

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Listbox - Moving Items Around

There's something I need to and I just aint got a clue.

I'm adding stuff to a listbox, namely a filename, which via a varible and array containing a structure is working fine.

But what I need to do now is to be able to select an item in the listbox and move it up or down, so it runs in a different order...... also remove an item.

Please help

06-13-2005, 06:01 PM

mrjeffy321 mrjeffy321 is offline

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Here is an example on how to move an item up the list,

Code:

Dim index As Integer
        index = ListBox1.SelectedIndex
        If index > 0 Then 'make sure someting is selected and you cant move the top item up
            Dim item As String
            item = ListBox1.Items(index)
            ListBox1.Items.RemoveAt(index)
            ListBox1.Items.Insert(index - 1, item)
            ListBox1.SelectedIndex = index - 1
        End If

to remove an item, you can either use ListBox1.Items.Remove (), which will remove all the items in the list that have the same value as the parameter you pass in, or you can use ListBox1.Items.RemoveAt (), which will remove just the specific item at the given index number.

What my code does it gets the selected item, removes it from the list, then re-adds it one position higher, then reselects the item. This shouldnt be hard to modify to move the item down the list, it only means adding one to the index number as opposed to subtracting one.

06-13-2005, 10:18 PM

JustAdotNETUser JustAdotNETUser is offline

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Thank you very much, that worked great.

06-14-2005, 08:18 PM

JustAdotNETUser JustAdotNETUser is offline

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Thanks again for your answer. As with moving the listbox items up and down the list I also have to move the contents of an array (not arraylist) to coincide with the listbox. My array contains a 'structure' and when I move an item up the listbox this code is also called (which works fine):

Code:

Dim InfoOnTop As CURRENT_FILE = MYARRAY(Index - 1)
MYARRAY(Index - 1) = MYARRAY(Index)
MYARRAY(Index) = InfoOnTop

I also have one for move down, all is fine.

The problem I have now is I have to find a way to remove an item. Removing it from the listbox is fine, but I now have to remove from the array at the same time so and array like this:

1:1
2:2
3:3
4:4

removing 3 would produce an array of:

1:1
2:2
4:4

Thanks

06-14-2005, 08:40 PM

mrjeffy321 mrjeffy321 is offline

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One idea that comes to mind (if you dont want to switch to an array list, but rather stay with an array), is to redim to array to the new size and then refil it.

you could redim the array, then fill it up with the values from the list box.

06-15-2005, 01:29 AM

JustAdotNETUser JustAdotNETUser is offline

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I tried changing to an arraylist but dont know how to do things like: Public FILE(16) As CURRENT_FILE

current file is a structure

Let me just expand on that....

Lets say the CURRENT_FILE structure contains:

FILENAME As String
FILESIZE As Integer

and in my code I would have things like:

TextBox1.Text = FILE(I).FILENAME

and such like, well if I change over to ArrayList, which I'd like, how do I amend the 'normal' array stuff so I can access my data like a normal array?

What do I need to change: 'Public FILE(16) As CURRENT_FILE' to?

Thanks For Any Help

Last edited by JustAdotNETUser; 06-15-2005 at 02:47 AM.

06-15-2005, 10:12 AM

mrjeffy321 mrjeffy321 is offline

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So your question is, how would you add and access your data once it is put into an array list?
It is very similar to accessing it from an array, you just need to know the items index number that you want to access, for example, lets say you have an array list called "array_list", that has one item in it, and that item is a CurrentFile file,

Code:

Private Structure CurrentFile 'defines the structure
     Dim FileName As String
     Dim FileSize As String
End Structure

Code:

'here, you declare the arry list and the file, then add the file to the array list
        Dim array_list As New ArrayList
        Dim file As CurrentFile
        file.FileName = "test Name"
        file.FileSize = "Size"
        array_list.Add(file)

now, to access the file you just put into the list, you can use array_list(0), if you want to know its FileName, array_list(0).FileName, or to know its FileSize, array_list(0).FileName

before you were declaring an array of CurrentFiles, now you only need one at a time to add to the array list.