Add wxActivateEvent::GetActivationReason().

This method is implemented for wxMSW-only currently and allows to check
whether the window is being activated by a mouse click or in some other way
there.

Closes #15516.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74915 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -2275,19 +2275,36 @@ private:
 class WXDLLIMPEXP_CORE wxActivateEvent : public wxEvent
 {
 public:
-    wxActivateEvent(wxEventType type = wxEVT_NULL, bool active = true, int Id = 0)
-        : wxEvent(Id, type)
-        { m_active = active; }
+    // Type of activation. For now we can only detect if it was by mouse or by
+    // some other method and even this is only available under wxMSW.
+    enum Reason
+    {
+        Reason_Mouse,
+        Reason_Unknown
+    };
+
+    wxActivateEvent(wxEventType type = wxEVT_NULL, bool active = true,
+                    int Id = 0, Reason activationReason = Reason_Unknown)
+        : wxEvent(Id, type),
+        m_activationReason(activationReason)
+    {
+        m_active = active;
+    }
     wxActivateEvent(const wxActivateEvent& event)
         : wxEvent(event)
-    { m_active = event.m_active; }
+    {
+        m_active = event.m_active;
+        m_activationReason = event.m_activationReason;
+    }
 
     bool GetActive() const { return m_active; }
+    Reason GetActivationReason() const { return m_activationReason;}
 
     virtual wxEvent *Clone() const { return new wxActivateEvent(*this); }
 
 private:
     bool m_active;
+    Reason m_activationReason;
 
 private:
     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxActivateEvent)