Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/theme/cfwl_datetimepickedtp.cpp

 // 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
 
 #include "xfa/fwl/theme/cfwl_datetimepickertp.h"
 
 #include "xfa/fwl/basewidget/ifwl_datetimepicker.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
 
 CFWL_DateTimePickerTP::CFWL_DateTimePickerTP() {
   m_pThemeData = new DTPThemeData;
   initThemeData();
 }
+
 CFWL_DateTimePickerTP::~CFWL_DateTimePickerTP() {
   delete m_pThemeData;
 }
-FX_BOOL CFWL_DateTimePickerTP::IsValidWidget(IFWL_Widget* pWidget) {
-  if (!pWidget)
-    return FALSE;
-  return pWidget->GetClassID() == FWL_CLASSHASH_DateTimePicker;
+
+bool CFWL_DateTimePickerTP::IsValidWidget(IFWL_Widget* pWidget) {
+  return pWidget && pWidget->GetClassID() == FWL_Type::DateTimePicker;
 }
+
 FX_BOOL CFWL_DateTimePickerTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   if (!pParams)
     return FALSE;
   switch (pParams->m_iPart) {
     case CFWL_Part::Border: {
       DrawBorder(pParams->m_pGraphics, &pParams->m_rtPart, &pParams->m_matrix);
       break;
     }
     case CFWL_Part::Edge: {
       DrawEdge(pParams->m_pGraphics, pParams->m_pWidget->GetStyles(),
@@ skipping 59 matching lines @@
   *pData++ = ArgbEncode(255, 255, 255, 255),
   *pData++ = ArgbEncode(255, 220, 220, 215),
   *pData++ = ArgbEncode(255, 255, 255, 255),
   *pData++ = ArgbEncode(255, 255, 240, 207),
   *pData++ = ArgbEncode(255, 248, 179, 48),
   *pData++ = ArgbEncode(255, 176, 176, 167),
   *pData++ = ArgbEncode(255, 241, 239, 239),
   *pData++ = ArgbEncode(255, 255, 255, 255),
   *pData++ = ArgbEncode(255, 255, 255, 255);
 }