Move event generation code for multiple selection mode to common code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/lboxcmn.cpp

@@ -82,6 +82,112 @@ void wxListBoxBase::DeselectAll(int itemToLeaveSelected)
     }
 }
 
+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.GetCount() == 0) && (m_oldSelections.GetCount() == 0))
+        {
+            // nothing changed, just leave
+            return;
+        }
+        
+        if (selections.GetCount() == m_oldSelections.GetCount())
+        {
+            bool changed = false;
+            size_t idx;
+            for (idx = 0; idx < selections.GetCount(); idx++)
+            {
+                if (selections[idx] != m_oldSelections[idx])
+                {
+                    changed = true;
+                    break;
+                }
+            }
+            
+            // nothing changed, just leave
+            if (!changed)
+               return;
+        }
+
+        if (selections.GetCount() == 0)
+        {
+            // indicate that this is a deselection
+            event.SetExtraLong( 0 );
+            int item = m_oldSelections[0];
+            m_oldSelections = selections;
+            LBSendEvent( event, this, item );
+            return;
+        }
+        
+        int item;
+        // Now test if any new item is selected
+        bool any_new_selected = false;
+        size_t idx;
+        for (idx = 0; idx < selections.GetCount(); 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 );
+            m_oldSelections = selections;
+            LBSendEvent( event, this, item );
+            return;
+        }
+        
+        // Now test if any new item is deselected
+        bool any_new_deselected = false;
+        for (idx = 0; idx < m_oldSelections.GetCount(); 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 );
+            m_oldSelections = selections;
+            LBSendEvent( event, this, item );
+            return;
+        }
+        
+        wxLogError( wxT("Wrong wxListBox selection") );
+}
+
 // ----------------------------------------------------------------------------
 // misc
 // ----------------------------------------------------------------------------