Use virtual function to retrieve interface pointer

xfa/fwl/lightwidget/cfwl_datetimepicker.cpp

Index: xfa/fwl/lightwidget/cfwl_datetimepicker.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_datetimepicker.cpp b/xfa/fwl/lightwidget/cfwl_datetimepicker.cpp
index dba1a527b49fe924d4e83e869831b257ea0d3bed..1256e1a35d17cf86fd281bd7deb8f315b58a5521 100644
--- a/xfa/fwl/lightwidget/cfwl_datetimepicker.cpp
+++ b/xfa/fwl/lightwidget/cfwl_datetimepicker.cpp
@@ -12,6 +12,14 @@
 #include "xfa/fwl/core/fwl_error.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
+IFWL_DateTimePicker* CFWL_DateTimePicker::GetWidget() {
+  return static_cast<IFWL_DateTimePicker*>(m_pIface.get());
+}
+
+const IFWL_DateTimePicker* CFWL_DateTimePicker::GetWidget() const {
+  return static_cast<IFWL_DateTimePicker*>(m_pIface.get());
+}
+
 CFWL_DateTimePicker* CFWL_DateTimePicker::Create() {
   return new CFWL_DateTimePicker;
 }
@@ -31,7 +39,7 @@ FWL_Error CFWL_DateTimePicker::Initialize(
   if (ret != FWL_Error::Succeeded) {
     return ret;
   }
-  m_pIface = pDateTimePicker.release();
+  m_pIface = std::move(pDateTimePicker);
   CFWL_Widget::Initialize();
   return FWL_Error::Succeeded;
 }
@@ -46,34 +54,31 @@ FWL_Error CFWL_DateTimePicker::SetToday(int32_t iYear,
 }
 
 int32_t CFWL_DateTimePicker::CountSelRanges() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CountSelRanges();
+  return GetWidget()->CountSelRanges();
 }
 
 int32_t CFWL_DateTimePicker::GetSelRange(int32_t nIndex, int32_t& nStart) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)
-      ->GetSelRange(nIndex, nStart);
+  return GetWidget()->GetSelRange(nIndex, nStart);
 }
 
 FWL_Error CFWL_DateTimePicker::GetEditText(CFX_WideString& wsText) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->GetEditText(wsText);
+  return GetWidget()->GetEditText(wsText);
 }
 
 FWL_Error CFWL_DateTimePicker::SetEditText(const CFX_WideString& wsText) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->SetEditText(wsText);
+  return GetWidget()->SetEditText(wsText);
 }
 
 FWL_Error CFWL_DateTimePicker::GetCurSel(int32_t& iYear,
                                          int32_t& iMonth,
                                          int32_t& iDay) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)
-      ->GetCurSel(iYear, iMonth, iDay);
+  return GetWidget()->GetCurSel(iYear, iMonth, iDay);
 }
 
 FWL_Error CFWL_DateTimePicker::SetCurSel(int32_t iYear,
                                          int32_t iMonth,
                                          int32_t iDay) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)
-      ->SetCurSel(iYear, iMonth, iDay);
+  return GetWidget()->SetCurSel(iYear, iMonth, iDay);
 }
 
 CFWL_DateTimePicker::CFWL_DateTimePicker() {}
@@ -105,67 +110,66 @@ FWL_Error CFWL_DateTimePicker::CFWL_DateTimePickerDP::GetToday(
 }
 
 FX_BOOL CFWL_DateTimePicker::CanUndo() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CanUndo();
+  return GetWidget()->CanUndo();
 }
 
 FX_BOOL CFWL_DateTimePicker::CanRedo() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CanRedo();
+  return GetWidget()->CanRedo();
 }
 
 FX_BOOL CFWL_DateTimePicker::Undo() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Undo();
+  return GetWidget()->Undo();
 }
 
 FX_BOOL CFWL_DateTimePicker::Redo() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Redo();
+  return GetWidget()->Redo();
 }
 
 FX_BOOL CFWL_DateTimePicker::CanCopy() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CanCopy();
+  return GetWidget()->CanCopy();
 }
 
 FX_BOOL CFWL_DateTimePicker::CanCut() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CanCut();
+  return GetWidget()->CanCut();
 }
 
 FX_BOOL CFWL_DateTimePicker::CanSelectAll() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->CanSelectAll();
+  return GetWidget()->CanSelectAll();
 }
 
 FX_BOOL CFWL_DateTimePicker::Copy(CFX_WideString& wsCopy) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Copy(wsCopy);
+  return GetWidget()->Copy(wsCopy);
 }
 
 FX_BOOL CFWL_DateTimePicker::Cut(CFX_WideString& wsCut) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Copy(wsCut);
+  return GetWidget()->Copy(wsCut);
 }
 
 FX_BOOL CFWL_DateTimePicker::Paste(const CFX_WideString& wsPaste) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Paste(wsPaste);
+  return GetWidget()->Paste(wsPaste);
 }
 
 FX_BOOL CFWL_DateTimePicker::SelectAll() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->SelectAll();
+  return GetWidget()->SelectAll();
 }
 
 FX_BOOL CFWL_DateTimePicker::Delete() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->Delete();
+  return GetWidget()->Delete();
 }
 
 FX_BOOL CFWL_DateTimePicker::DeSelect() {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->DeSelect();
+  return GetWidget()->DeSelect();
 }
 
 FWL_Error CFWL_DateTimePicker::GetBBox(CFX_RectF& rect) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->GetBBox(rect);
+  return GetWidget()->GetBBox(rect);
 }
 
 FWL_Error CFWL_DateTimePicker::SetEditLimit(int32_t nLimit) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)->SetEditLimit(nLimit);
+  return GetWidget()->SetEditLimit(nLimit);
 }
 
 FWL_Error CFWL_DateTimePicker::ModifyEditStylesEx(uint32_t dwStylesExAdded,
                                                   uint32_t dwStylesExRemoved) {
-  return static_cast<IFWL_DateTimePicker*>(m_pIface)
-      ->ModifyEditStylesEx(dwStylesExAdded, dwStylesExRemoved);
+  return GetWidget()->ModifyEditStylesEx(dwStylesExAdded, dwStylesExRemoved);
 }