Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/core/ifwl_datetimecalendar.h

Index: xfa/fwl/core/ifwl_datetimecalendar.h
diff --git a/xfa/fwl/core/ifwl_datetimecalendar.h b/xfa/fwl/core/ifwl_datetimecalendar.h
new file mode 100644
index 0000000000000000000000000000000000000000..3f29a59820a72eb9068a87cb59350df3338396b7
--- /dev/null
+++ b/xfa/fwl/core/ifwl_datetimecalendar.h
@@ -0,0 +1,47 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FWL_CORE_IFWL_DATETIMECALENDAR_H_
+#define XFA_FWL_CORE_IFWL_DATETIMECALENDAR_H_
+
+#include "xfa/fwl/core/ifwl_monthcalendar.h"
+
+class IFWL_DateTimeCalendar : public IFWL_MonthCalendar {
+ public:
+  static IFWL_DateTimeCalendar* Create(
+      const CFWL_WidgetImpProperties& properties,
+      IFWL_Widget* pOuter);
+
+  IFWL_DateTimeCalendar(const CFWL_WidgetImpProperties& properties,
+                        IFWL_Widget* pOuter);
+
+  // IFWL_MonthCalendar
+  FWL_Error Initialize() override;
+  FWL_Error Finalize() override;
+
+ protected:
+  friend class CFWL_DateTimeCalendarImpDelegate;
+};
+
+class CFWL_DateTimeCalendarImpDelegate : public CFWL_MonthCalendarImpDelegate {
+ public:
+  CFWL_DateTimeCalendarImpDelegate(IFWL_DateTimeCalendar* pOwner);
+  void OnProcessMessage(CFWL_Message* pMessage) override;
+
+  void OnLButtonDownEx(CFWL_MsgMouse* pMsg);
+  void OnLButtonUpEx(CFWL_MsgMouse* pMsg);
+  void OnMouseMoveEx(CFWL_MsgMouse* pMsg);
+
+ protected:
+  IFWL_DateTimeCalendar* m_pOwner;
+  FX_BOOL m_bFlag;
+
+ private:
+  void DisForm_OnProcessMessage(CFWL_Message* pMessage);
+  void DisForm_OnLButtonUpEx(CFWL_MsgMouse* pMsg);
+};
+
+#endif  // XFA_FWL_CORE_IFWL_DATETIMECALENDAR_H_