fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp

Index: fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp
diff --git a/fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp b/fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp
index f6e6d754d53962b4f8ab7b72626c7db7beeadb32..9c9c623e28cb89fd50e25772e435fb07492a9eb5 100644
--- a/fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_ComboBox.cpp
@@ -471,6 +471,13 @@ void CPWL_ComboBox::SetPopup(FX_BOOL bPopup) {
 
   if (bPopup) {
     if (m_pFillerNotify) {
+#ifdef PDF_ENABLE_XFA
+      FX_BOOL bExit = FALSE;
+      m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), bExit, 0);
+      if (bExit)
+        return;
+
+#endif
       int32_t nWhere = 0;
       FX_FLOAT fPopupRet = 0.0f;
       FX_FLOAT fPopupMin = 0.0f;
@@ -498,6 +505,13 @@ void CPWL_ComboBox::SetPopup(FX_BOOL bPopup) {
 
         m_nPopupWhere = nWhere;
         Move(rcWindow, TRUE, TRUE);
+#ifdef PDF_ENABLE_XFA
+
+        bExit = FALSE;
+        m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), bExit, 0);
+        if (bExit)
+          return;
+#endif
       }
     }
   } else {
@@ -518,6 +532,18 @@ FX_BOOL CPWL_ComboBox::OnKeyDown(FX_WORD nChar, FX_DWORD nFlag) {
     case FWL_VKEY_Up:
       if (m_pList->GetCurSel() > 0) {
         FX_BOOL bExit = FALSE;
+#ifdef PDF_ENABLE_XFA
+
+        if (m_pFillerNotify) {
+          m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), bExit, nFlag);
+          if (bExit)
+            return FALSE;
+          bExit = FALSE;
+          m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), bExit, nFlag);
+          if (bExit)
+            return FALSE;
+        }
+#endif
         if (m_pList->OnKeyDownWithExit(nChar, bExit, nFlag)) {
           if (bExit)
             return FALSE;
@@ -528,6 +554,18 @@ FX_BOOL CPWL_ComboBox::OnKeyDown(FX_WORD nChar, FX_DWORD nFlag) {
     case FWL_VKEY_Down:
       if (m_pList->GetCurSel() < m_pList->GetCount() - 1) {
         FX_BOOL bExit = FALSE;
+#ifdef PDF_ENABLE_XFA
+
+        if (m_pFillerNotify) {
+          m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), bExit, nFlag);
+          if (bExit)
+            return FALSE;
+          bExit = FALSE;
+          m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), bExit, nFlag);
+          if (bExit)
+            return FALSE;
+        }
+#endif
         if (m_pList->OnKeyDownWithExit(nChar, bExit, nFlag)) {
           if (bExit)
             return FALSE;
@@ -555,6 +593,17 @@ FX_BOOL CPWL_ComboBox::OnChar(FX_WORD nChar, FX_DWORD nFlag) {
     return m_pEdit->OnChar(nChar, nFlag);
 
   FX_BOOL bExit = FALSE;
+#ifdef PDF_ENABLE_XFA
+  if (m_pFillerNotify) {
+    m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), bExit, nFlag);
+    if (bExit)
+      return FALSE;
+
+    m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), bExit, nFlag);
+    if (bExit)
+      return FALSE;
+  }
+#endif
   return m_pList->OnCharWithExit(nChar, bExit, nFlag) ? bExit : FALSE;
 }