private void Listbox_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
ThisIndexHasBeenChangedProgrammatically = -1;
if (Listbox.SelectedIndex == -1) //true when nothing is selected
{
}
else if (!CheckIfThumbMouseButtonsHaveBeenPressed(e))
{
if (Listbox.Items.Count > 0)
{
Listbox.MouseDown -= Listbox_MouseDown;
_mouseUpIndex = Listbox.IndexFromPoint(Listbox.PointToClient(Cursor.Position));
HandleSelectionChange();
if (Listbox.SelectedIndex != -1)
{
OnSelectionReady?.Invoke(this, EventArgs.Empty);
}
}
}
Listbox.SelectedIndexChanged += Listbox_SelectedIndexChanged;
}
private void Listbox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
Listbox.SelectedIndexChanged -= Listbox_SelectedIndexChanged;
if (Listbox.Items.Count <= 0)
{
return;
}
OnSelectionNotReady?.Invoke(this, EventArgs.Empty);
if (CheckIfThumbMouseButtonsHaveBeenPressed(e))
{
return;
}
_mouseDownIndex = Listbox.IndexFromPoint(e.Location);
//if selection starts beneath the listbox, we don't want anything selected,
//since the selection is "buggy" and doesn't select as one would assume.
if (_mouseDownIndex != -1)
{
return;
}
if (Listbox.SelectedIndex != -1)
{
Listbox.SetSelected(Listbox.SelectedIndex, false);
}
Listbox.Enabled = false;
Listbox.Enabled = true;
}
