Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/ifwl_caret.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/core/ifwl_caret.h"
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
@@ skipping 17 matching lines @@
   if (m_pTimerInfo) {
     m_pTimerInfo->StopTimer();
     m_pTimerInfo = nullptr;
   }
 }
 
 FWL_Type IFWL_Caret::GetClassID() const {
   return FWL_Type::Caret;
 }
 
-FWL_Error IFWL_Caret::DrawWidget(CFX_Graphics* pGraphics,
-                                 const CFX_Matrix* pMatrix) {
+void IFWL_Caret::DrawWidget(CFX_Graphics* pGraphics,
+                            const CFX_Matrix* pMatrix) {
   if (!pGraphics)
-    return FWL_Error::Indefinite;
+    return;
   if (!m_pProperties->m_pThemeProvider)
     m_pProperties->m_pThemeProvider = GetAvailableTheme();
   if (!m_pProperties->m_pThemeProvider)
-    return FWL_Error::Indefinite;
+    return;
 
   DrawCaretBK(pGraphics, m_pProperties->m_pThemeProvider, pMatrix);
-  return FWL_Error::Succeeded;
 }
 
 void IFWL_Caret::ShowCaret(bool bFlag) {
   if (m_pTimerInfo) {
     m_pTimerInfo->StopTimer();
     m_pTimerInfo = nullptr;
   }
   if (bFlag)
     m_pTimerInfo = m_pTimer->StartTimer(m_dwElapse, true);
 
@@ skipping 51 matching lines @@
 void IFWL_Caret::Timer::Run(IFWL_TimerInfo* pTimerInfo) {
   IFWL_Caret* pCaret = static_cast<IFWL_Caret*>(m_pWidget);
   bool toggle = !(pCaret->GetStates() & FWL_STATE_CAT_HightLight);
   pCaret->SetStates(FWL_STATE_CAT_HightLight, toggle);
 
   CFX_RectF rt;
   pCaret->GetWidgetRect(rt);
   rt.Set(0, 0, rt.width + 1, rt.height);
   pCaret->Repaint(&rt);
 }