[perl-win32-gui-users] SelectedItems method

[Erick J. Bourgeois]

I'm trying to test if any items have been selected in a
listview with a button event and I have used the -singlesel
option on the listview. So, therefore, if the user clicks
the button without selecting anything, I would like to have
a MsgBox, else take the value of the the choosen selection
and do some computation.

$MainWin->AddListView(
        -name          => "ListView",
        -pos           => [85, 100],
        -size          => [$MainWin->ScaleWidth-160,
$MainWin->ScaleHeight-170],
        -style         => WS_CHILD | WS_VISIBLE | 1 |
WS_HSCROLL | WS_VSCROLL,
        -fullrowselect => -1,
        -gridlines     => 0,
        -hottrack      => 0,
        -visible       => 0,
        -view          => 1,
        -tabstop       => 4,
        -singlesel     => 1,
    );
    $width = $MainWin->ListView->ScaleWidth;
    $MainWin->ListView->InsertColumn(
        -index   => 0,
        -subitem => 0,
        -width   => $width-15,
        -text    => "Column",
    );
    for (sort keys %SomeHash) {
        $MainWin->ListView->InsertItem(-text=>[$_]);
    }
$MainWin->AddButton(
        -name       => "Button",
        -text       => "&Ok",
        -pos        => [347, 350],
        -height     => 20,
 );

sub Button_Click {
    my @index = $MainWin->ListView->SelectedItems();
    if (@index[0] >= 0) { #I need the zero because of the
zero-based index
        #do something...
    } else {
        Win32::MsgBox(...);
}

When "Button" is pressed it always falls through the if
statement. Even in the case of no selection it falls through
because @index[0], in this case, is undef. I know undef is
the same as 0, but how could I get around this?

erick
never stop questioning
www.jeb.ca