Stop deriving some internal classes from wxQtSignalHandler under wxQt

It is not necessary (nor beneficial) to derive these classes: wxQtActionGroup,
wxQtAction and wxQtShortcutHandler from wxQtSignalHandler ( which is intended
for use exclusively with wxWindow handlers only ).

src/qt/menu.cpp

@@ -25,13 +25,12 @@ static void ApplyStyle( QMenu *qtMenu, long style )
 
 // wxQtActionGroup: an exclusive group which synchronizes QActions in
 // QActionGroup with their wx wrappers.
-class wxQtActionGroup : public QActionGroup, public wxQtSignalHandler
+class wxQtActionGroup : public QActionGroup
 {
 
 public:
     explicit wxQtActionGroup( wxMenu* handler )
-        : QActionGroup( handler->GetHandle() ),
-          wxQtSignalHandler( handler )
+        : QActionGroup( handler->GetHandle() )
     {
         setExclusive(true);
 
@@ -44,7 +43,16 @@ public:
     }
 
 private:
-    void triggered ( QAction* action );
+    void triggered ( QAction* action )
+    {
+        if ( action != m_activeAction )
+        {
+            if ( m_activeAction->isCheckable() )
+                m_activeAction->setChecked(false);
+
+            m_activeAction = action;
+        }
+    }
 
     QAction* m_activeAction;
 };
@@ -342,14 +350,3 @@ QWidget *wxMenuBar::GetHandle() const
 {
     return m_qtMenuBar;
 }
-
-void wxQtActionGroup::triggered( QAction* action )
-{
-    if ( action != m_activeAction )
-    {
-        if ( m_activeAction->isCheckable() )
-            m_activeAction->setChecked(false);
-
-        m_activeAction = action;
-    }
-}

src/qt/menuitem.cpp

@@ -18,12 +18,12 @@
 #include <QtWidgets/QAction>
 #include <QtWidgets/QMenuBar>
 
-class wxQtAction : public QAction, public wxQtSignalHandler
+class wxQtAction : public QAction
 {
 
 public:
     wxQtAction( wxMenu *handler, int id, const wxString &text, const wxString &help,
-        wxItemKind kind, wxMenu *subMenu, wxMenuItem *menuItem );
+                wxItemKind kind, wxMenu *subMenu, wxMenuItem *menuItem );
 
     // Set the action shortcut to correspond to the accelerator specified by
     // the given label. They set the primary shortcut the first time they are
@@ -32,11 +32,6 @@ public:
     void UpdateShortcuts(const wxString& text);
     void UpdateShortcutsFromLabel(const wxString& text);
 
-    wxMenu* GetMenu() const
-    {
-        return static_cast<wxMenu*>(wxQtSignalHandler::GetHandler());
-    }
-
     // Convert hyphenated shortcuts to use the plus sign (+) which Qt understands.
     // Example: [ Ctrl-Shift-- ] should be converted to [ Ctrl+Shift+- ]
     static wxString Normalize(const wxString& text)
@@ -47,9 +42,17 @@ public:
     }
 
 private:
-    void onActionToggled( bool checked );
-    void onActionTriggered( bool checked );
+    void onActionToggled( bool checked )
+    {
+        m_handler->Check(m_mitemId, checked);
+    }
 
+    void onActionTriggered( bool checked )
+    {
+        m_handler->SendEvent(m_mitemId, m_isCheckable ? checked : -1 );
+    }
+
+    wxMenu* m_handler;
     const wxWindowID m_mitemId;
     const bool m_isCheckable;
 };
@@ -182,9 +185,9 @@ void wxMenuItem::ClearExtraAccels()
 //=============================================================================
 
 wxQtAction::wxQtAction( wxMenu *handler, int id, const wxString &text, const wxString &help,
-        wxItemKind kind, wxMenu *subMenu, wxMenuItem *menuItem )
+                        wxItemKind kind, wxMenu *subMenu, wxMenuItem *menuItem )
     : QAction( wxQtConvertString( text ), handler->GetHandle() ),
-      wxQtSignalHandler( handler ),
+      m_handler(handler),
       m_mitemId(menuItem->GetId()), m_isCheckable(menuItem->IsCheckable())
 {
     setStatusTip( wxQtConvertString( help ));
@@ -259,13 +262,3 @@ void wxQtAction::UpdateShortcuts(const wxString& text)
     wxUnusedVar(text);
 #endif // wxUSE_ACCEL
 }
-
-void wxQtAction::onActionToggled( bool checked )
-{
-    GetMenu()->Check(m_mitemId, checked);
-}
-
-void wxQtAction::onActionTriggered( bool checked )
-{
-    GetMenu()->SendEvent(m_mitemId, m_isCheckable ? checked : -1 );
-}

src/qt/window.cpp

@@ -218,27 +218,24 @@ void wxQtScrollArea::OnSliderReleased()
 }
 
 #if wxUSE_ACCEL || defined( Q_MOC_RUN )
-class wxQtShortcutHandler : public QObject, public wxQtSignalHandler
+
+class wxQtShortcutHandler : public QObject
 {
-
 public:
-    wxQtShortcutHandler( wxWindowQt *window );
+    explicit wxQtShortcutHandler( wxWindow *handler ) : m_handler(handler) { }
 
-public:
-    void activated();
+    void activated()
+    {
+        const int command = sender()->property("wxQt_Command").toInt();
+
+        m_handler->QtHandleShortcut( command );
+    }
+
+private:
+
+    wxWindow* const m_handler;
 };
 
-wxQtShortcutHandler::wxQtShortcutHandler( wxWindowQt *window )
-    : wxQtSignalHandler( window )
-{
-}
-
-void wxQtShortcutHandler::activated()
-{
-    int command = sender()->property("wxQt_Command").toInt();
-
-    static_cast<wxWindowQt*>(GetHandler())->QtHandleShortcut( command );
-}
 #endif // wxUSE_ACCEL
 
 //##############################################################################