Split the common event classes out to files.

xfa/fwl/core/cfwl_evtmousewheel.cpp

Index: xfa/fwl/core/cfwl_evtmousewheel.cpp
diff --git a/xfa/fxfa/parser/cxfa_text.cpp b/xfa/fwl/core/cfwl_evtmousewheel.cpp
similarity index 52%
copy from xfa/fxfa/parser/cxfa_text.cpp
copy to xfa/fwl/core/cfwl_evtmousewheel.cpp
index fc7d7aa280e2900081d2e05d99d1a5e94fd7bd68..215947c0ea35ab42c79e735597cb05cd4791d8af 100644
--- a/xfa/fxfa/parser/cxfa_text.cpp
+++ b/xfa/fwl/core/cfwl_evtmousewheel.cpp
@@ -4,12 +4,12 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "xfa/fxfa/parser/cxfa_text.h"
+#include "xfa/fwl/core/cfwl_evtmousewheel.h"
 
-#include "xfa/fxfa/parser/xfa_object.h"
+CFWL_EvtMouseWheel::CFWL_EvtMouseWheel() {}
 
-CXFA_Text::CXFA_Text(CXFA_Node* pNode) : CXFA_Data(pNode) {}
+CFWL_EvtMouseWheel::~CFWL_EvtMouseWheel() {}
 
-void CXFA_Text::GetContent(CFX_WideString& wsText) {
-  m_pNode->TryContent(wsText);
+CFWL_EventType CFWL_EvtMouseWheel::GetClassID() const {
+  return CFWL_EventType::MouseWheel;
 }