+void wxListBoxBase::UpdateOldSelections()
+{
+ if (HasFlag(wxLB_MULTIPLE) || HasFlag(wxLB_EXTENDED))
+ GetSelections( m_oldSelections );
+}
+
+static void LBSendEvent( wxCommandEvent &event, wxListBoxBase *listbox, int item )
+{
+ event.SetInt( item );
+ event.SetString( listbox->GetString( item ) );
+ if ( listbox->HasClientObjectData() )
+ event.SetClientObject( listbox->GetClientObject(item) );
+ else if ( listbox->HasClientUntypedData() )
+ event.SetClientData( listbox->GetClientData(item) );
+ listbox->HandleWindowEvent( event );
+}
+
+void wxListBoxBase::CalcAndSendEvent()
+{
+ wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, GetId());
+ event.SetEventObject( this );
+
+ wxArrayInt selections;
+ GetSelections(selections);
+
+ if ( selections.empty() && m_oldSelections.empty() )
+ {
+ // nothing changed, just leave
+ return;
+ }
+
+ const size_t countSel = selections.size(),
+ countSelOld = m_oldSelections.size();
+ if ( countSel == countSelOld )
+ {
+ bool changed = false;
+ for ( size_t idx = 0; idx < countSel; idx++ )
+ {
+ if (selections[idx] != m_oldSelections[idx])
+ {
+ changed = true;
+ break;
+ }
+ }
+
+ // nothing changed, just leave
+ if ( !changed )
+ return;
+ }
+
+ int item = wxNOT_FOUND;
+ if ( selections.empty() )
+ {
+ // indicate that this is a deselection
+ event.SetExtraLong(0);
+ item = m_oldSelections[0];
+ }
+ else // we [still] have some selections
+ {
+ // Now test if any new item is selected
+ bool any_new_selected = false;
+ for ( size_t idx = 0; idx < countSel; idx++ )
+ {
+ item = selections[idx];
+ if ( m_oldSelections.Index(item) == wxNOT_FOUND )
+ {
+ any_new_selected = true;
+ break;
+ }
+ }
+
+ if ( any_new_selected )
+ {
+ // indicate that this is a selection
+ event.SetExtraLong(1);
+ }
+ else // no new items selected
+ {
+ // Now test if any new item is deselected
+ bool any_new_deselected = false;
+ for ( size_t idx = 0; idx < countSelOld; idx++ )
+ {
+ item = m_oldSelections[idx];
+ if ( selections.Index(item) == wxNOT_FOUND )
+ {
+ any_new_deselected = true;
+ break;
+ }
+ }
+
+ if ( any_new_deselected )
+ {
+ // indicate that this is a selection
+ event.SetExtraLong(0);
+ }
+ else
+ {
+ item = wxNOT_FOUND; // this should be impossible
+ }
+ }
+ }
+
+ wxASSERT_MSG( item != wxNOT_FOUND,
+ "Logic error in wxListBox selection event generation code" );
+
+ m_oldSelections = selections;
+
+ LBSendEvent(event, this, item);
+}
+