protected virtual void OnItemDeselecting(ItemChangingEventArgs e)
{
if (ItemDeselecting != null)
{
ItemDeselecting(this, e);
}
}
private void ItemStateChanging(ref Message m, ref NMLISTVIEW nmlv)
{
if ((nmlv.uChanged & LVIF_STATE) == LVIF_STATE)
{
if ((nmlv.uOldState == LVIS_SELECTED) || //FROM ITEM
(nmlv.uNewState == LVIS_UNSELECTED))
{
if (m_cancel)
{
m.Result = new IntPtr(1);
m_cancel = false;
}
else
{
if ((nmlv.uOldState == LVIS_SELECTED) && //FROM ITEM
(nmlv.uNewState == LVIS_UNSELECTED))
{
ItemChangingEventArgs e = new ItemChangingEventArgs(nmlv.iItem, this.Items[nmlv.iItem]);
OnItemDeselecting(e);
if (e.Cancel)
{
m.Result = new IntPtr(1);
m_cancel = true;
}
}
}
}
else if ((nmlv.uOldState == LVIS_UNSELECTED) || //TO ITEM
(nmlv.uNewState == LVIS_SELECTED) ||
(nmlv.uNewState == LVIS_SELECTED_FOCUSED))
{
if (m_cancel)
{
m.Result = new IntPtr(1);
m_cancel = false;
}
}
}
}