Fix the position calculating of insert a radio menu item

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77795 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/menuitem.h

@@ -52,6 +52,8 @@ public:
     void SetAsRadioGroupStart();
     void SetRadioGroupStart(int start);
     void SetRadioGroupEnd(int end);
+    int GetRadioGroupStart();
+    int GetRadioGroupEnd();
 
     // wxUniv-specific methods for implementation only starting from here
 

src/univ/menu.cpp

@@ -1160,8 +1160,61 @@ wxMenuItem* wxMenu::DoAppend(wxMenuItem *item)
 
 wxMenuItem* wxMenu::DoInsert(size_t pos, wxMenuItem *item)
 {
-    if ( !wxMenuBase::DoInsert(pos, item) )
+    if ( item->GetKind() == wxITEM_RADIO )
-        return NULL;
+    {
+        unsigned int start, end;
+        wxMenuItemIter firstRadio;
+
+        if ( m_startRadioGroup == -1 )
+        {
+            // start a new radio group
+            m_startRadioGroup = pos;
+
+            // set this element as the first of radio group
+            item->SetAsRadioGroupStart();
+            item->SetRadioGroupEnd(m_startRadioGroup);
+            wxMenuBase::DoInsert(pos, item);
+            item->Check(true);
+        }
+        else // extend the current radio group
+        {
+            // get current first radio item in radio group
+            firstRadio = GetMenuItems().Item(m_startRadioGroup);
+
+            // get current radio group range
+            start = firstRadio->GetData()->GetRadioGroupStart();
+            end = firstRadio->GetData()->GetRadioGroupEnd();
+
+            if ( pos <= start )
+            {
+                // Item is inserted in the begining of the range
+                // we need to update its end item
+                m_startRadioGroup = pos;
+                item->SetAsRadioGroupStart();
+                item->SetRadioGroupEnd(end + 1);
+            }
+            else if ( (pos >= start) && (pos <= end) )
+            {
+                // we need to update its end item
+                item->SetRadioGroupStart(m_startRadioGroup);
+
+                // Item is inserted in the middle of this range or immediately
+                // after it in which case it extends this range so make it span
+                // one more item in any case.
+                if ( firstRadio )
+                {
+                    firstRadio->GetData()->SetRadioGroupEnd(end + 1);
+                }
+                else
+                {
+                    wxFAIL_MSG( wxT("where is the radio group start item?") );
+                }
+            }
+            wxMenuBase::DoInsert(pos, item);
+        }
+    }
+    else
+        wxMenuBase::DoInsert(pos, item);
 
     OnItemAdded(item);
 
@@ -1605,6 +1658,16 @@ void wxMenuItem::SetRadioGroupEnd(int end)
     m_radioGroup.end = end;
 }
 
+int wxMenuItem::GetRadioGroupStart()
+{
+    return m_radioGroup.start;
+}
+
+int wxMenuItem::GetRadioGroupEnd()
+{
+    return m_radioGroup.end;
+}
+
 // ----------------------------------------------------------------------------
 // wxMenuBar creation
 // ----------------------------------------------------------------------------