Replace calls to deprecated CFX_{Wide,Byte}String::Empty()

xfa/fxfa/parser/cxfa_widgetdata.cpp

 // Copyright 2016 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/fxfa/parser/cxfa_widgetdata.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fxbarcode/include/BC_Library.h"
@@ skipping 395 matching lines @@
       if (!pItemchild)
         continue;
 
       CFX_WideString text = pItemchild->GetContent();
       CFX_WideString wsChildValue = text;
       if (wsValue != text) {
         pItemchild = pItemchild->GetNodeItem(XFA_NODEITEM_NextSibling);
         if (pItemchild)
           wsChildValue = pItemchild->GetContent();
         else
-          wsChildValue.Empty();
+          wsChildValue.clear();
       }
       CXFA_WidgetData ch(pChild);
       ch.SyncValue(wsChildValue, bNotify);
     }
     exclGroup.SyncValue(wsValue, bNotify);
   } else {
     CXFA_Node* pItems = m_pNode->GetChild(0, XFA_ELEMENT_Items);
     if (!pItems)
       return;
 
@@ skipping 70 matching lines @@
     CXFA_Node* pItemchild = pItem->GetNodeItem(XFA_NODEITEM_FirstChild);
     if (!pItemchild)
       continue;
 
     CFX_WideString wsChildValue = pItemchild->GetContent();
     if (wsValue != wsChildValue) {
       pItemchild = pItemchild->GetNodeItem(XFA_NODEITEM_NextSibling);
       if (pItemchild)
         wsChildValue = pItemchild->GetContent();
       else
-        wsChildValue.Empty();
+        wsChildValue.clear();
     } else {
       wsExclGroup = wsValue;
     }
     pNode->SetContent(wsChildValue, wsChildValue, bNotify, bScriptModify,
                       FALSE);
   }
   if (m_pNode) {
     m_pNode->SetContent(wsExclGroup, wsExclGroup, bNotify, bScriptModify,
                         bSyncData);
   }
@@ skipping 81 matching lines @@
     if (bItemOneHasSave != bItemTwoHasSave && bSaveValue == bItemTwoHasSave)
       pItem = pItems[1];
   }
   pItems.RemoveAll();
   return pItem->CountChildren(XFA_ELEMENT_UNKNOWN);
 }
 
 FX_BOOL CXFA_WidgetData::GetChoiceListItem(CFX_WideString& wsText,
                                            int32_t nIndex,
                                            FX_BOOL bSaveValue) {
-  wsText.Empty();
+  wsText.clear();
   CXFA_NodeArray pItemsArray;
   CXFA_Node* pItems = NULL;
   int32_t iCount = 0;
   CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
   for (; pNode; pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     if (pNode->GetClassID() != XFA_ELEMENT_Items)
       continue;
 
     iCount++;
     pItemsArray.Add(pNode);
@@ skipping 880 matching lines @@
   if (!pNode)
     return TRUE;
 
   XFA_ELEMENT uiType = GetUIChild()->GetClassID();
   switch (uiType) {
     case XFA_ELEMENT_ChoiceList: {
       if (eValueType == XFA_VALUEPICTURE_Display) {
         int32_t iSelItemIndex = GetSelectedItem(0);
         if (iSelItemIndex >= 0) {
           GetChoiceListItem(wsValue, iSelItemIndex);
-          wsPicture.Empty();
+          wsPicture.clear();
         }
       }
     } break;
     case XFA_ELEMENT_NumericEdit:
       if (eValueType != XFA_VALUEPICTURE_Raw && wsPicture.IsEmpty()) {
         IFX_Locale* pLocale = GetLocal();
         if (eValueType == XFA_VALUEPICTURE_Display && pLocale) {
           CFX_WideString wsOutput;
           NormalizeNumStr(wsValue, wsOutput);
           FormatNumStr(wsOutput, pLocale, wsOutput);
@@ skipping 181 matching lines @@
     wsSrcNum.Delete(0, 1);
   }
   int32_t len = wsSrcNum.GetLength();
   int32_t dot_index = wsSrcNum.Find('.');
   if (dot_index == -1)
     dot_index = len;
 
   int32_t cc = dot_index - 1;
   if (cc >= 0) {
     int nPos = dot_index % 3;
-    wsOutput.Empty();
+    wsOutput.clear();
     for (int32_t i = 0; i < dot_index; i++) {
       if (i % 3 == nPos && i != 0)
         wsOutput += wsGroupSymbol;
 
       wsOutput += wsSrcNum[i];
     }
     if (dot_index < len) {
       CFX_WideString wsSymbol;
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Decimal, wsSymbol);
       wsOutput += wsSymbol;
@@ skipping 65 matching lines @@
         }
       }
     } else if (wc == L'.') {
       iTread_ = 0;
       iLead = -1;
     }
     wsRet += wc;
   }
   return wsRet;
 }