Ex 13-3 frustration

zavodney · July 20th, 2011, 07:40 PM

A few of my names are different than yours, but I can't find the problem. My selected choice will not highlight. The SessionIndex is correct based on my MessageBox and by checking while debugging. My code is the same as your book code (with a few name variations). Your code hightlights properly, but mine does not

. Since the SessionIndex is set correctly when the form loads it seems the the problem should be in this code, but I cannot find it.

Code:

Public Class SessionForm

    ' Public variables to communicate with the main form.
    Public SessionIndex As Integer
    Public SessionTitle As String

    ' Initialize the selection
    Private Sub SessionForm_Load() Handles MyBase.Load

        MessageBox.Show("SessionIndex is " & SessionIndex)

        lvwSession.SelectedIndices.Add(SessionIndex)

        ' Ensure that the selection is visible.
        lvwSession.SelectedItems(0).EnsureVisible()

    End Sub

    Private Sub btnOk_Click(sender As System.Object, e As System.EventArgs) Handles btnOk.Click

        ' Save the user's selection.
        SessionIndex = lvwSession.SelectedIndices(0)
        SessionTitle = lvwSession.SelectedItems(0).Text

    End Sub
End Class

Rod Stephens · July 21st, 2011, 10:32 AM

I don't see offhand what's wrong with this.

If you zip up the project and send it to me at [email protected], I'll take a look at it.

Rod Stephens · July 22nd, 2011, 04:48 PM

Wow! That was tricky. It turns out that your code was working correctly but the focus was initially on the OK button. The ListView control doesn't highlight the selected row when it doesn't have the focus. (I think on some controls you can set a property telling it to display the selection even if they don't have the focus but I guess this version of the ListView doesn't do that.) It's stupid but I think you're stuck with this behavior unless you use a different control or make your own.

Anyway, you can see the selection if you press Tab a couple times to move focus to the ListView.

The best solution is probably to change the tab order so the ListView begins with the focus. Open the for for editing, click the form, open the View menu and select Tab Order. Click on the controls in the order you want them to be used in the tab order (click the ListView first) and press Esc to get out of the tab order view. Now when the form appears you should see the selection.

It's a good thing you sent me the project because it would have been really hard to figure this out without experimenting with it.

Let me know if you have other problems with it.

zavodney · July 23rd, 2011, 12:40 AM

Thank you. I set the ListView to the first tab stop and it is working fine now. Little details can sure make a difference.