Add common base class between CXFA_FFComboBox and CXFA_FFListBox

This CL adds a CXFA_FFDropDown to serve as a base class for the
CXFA_FFComboBox and CXFA_FFListBox and adds a virtual InsertItem and
DeleteItem methods.

Change-Id: I325ffc579ed42a4755bae0c4d18667f8a9458950
Reviewed-on: https://pdfium-review.googlesource.com/24550
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

8 files changed, 57 insertions, 25 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 4fe979e3d0..bcb0e7ef32 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2023,6 +2023,8 @@ if (pdf_enable_xfa) {
       "xfa/fxfa/cxfa_ffdoc.h",
       "xfa/fxfa/cxfa_ffdocview.cpp",
       "xfa/fxfa/cxfa_ffdocview.h",
+      "xfa/fxfa/cxfa_ffdropdown.cpp",
+      "xfa/fxfa/cxfa_ffdropdown.h",
       "xfa/fxfa/cxfa_ffexclgroup.cpp",
       "xfa/fxfa/cxfa_ffexclgroup.h",
       "xfa/fxfa/cxfa_fffield.cpp",
diff --git a/xfa/fxfa/cxfa_ffcombobox.cpp b/xfa/fxfa/cxfa_ffcombobox.cpp
index 45ba63ccf8..f3d4d22f50 100644
--- a/xfa/fxfa/cxfa_ffcombobox.cpp
+++ b/xfa/fxfa/cxfa_ffcombobox.cpp
@@ -25,7 +25,7 @@ CFWL_ComboBox* ToComboBox(CFWL_Widget* widget) {
 }  // namespace
 
 CXFA_FFComboBox::CXFA_FFComboBox(CXFA_Node* pNode)
-    : CXFA_FFField(pNode), m_pOldDelegate(nullptr) {}
+    : CXFA_FFDropDown(pNode), m_pOldDelegate(nullptr) {}
 
 CXFA_FFComboBox::~CXFA_FFComboBox() {}
 
diff --git a/xfa/fxfa/cxfa_ffcombobox.h b/xfa/fxfa/cxfa_ffcombobox.h
index b7d0081bdc..5daab781a6 100644
--- a/xfa/fxfa/cxfa_ffcombobox.h
+++ b/xfa/fxfa/cxfa_ffcombobox.h
@@ -7,11 +7,11 @@
 #ifndef XFA_FXFA_CXFA_FFCOMBOBOX_H_
 #define XFA_FXFA_CXFA_FFCOMBOBOX_H_
 
-#include "xfa/fxfa/cxfa_fffield.h"
+#include "xfa/fxfa/cxfa_ffdropdown.h"
 
 class CXFA_EventParam;
 
-class CXFA_FFComboBox : public CXFA_FFField {
+class CXFA_FFComboBox : public CXFA_FFDropDown {
  public:
   explicit CXFA_FFComboBox(CXFA_Node* pNode);
   ~CXFA_FFComboBox() override;
@@ -45,15 +45,17 @@ class CXFA_FFComboBox : public CXFA_FFField {
   void OnDrawWidget(CXFA_Graphics* pGraphics,
                     const CFX_Matrix& matrix) override;
 
-  virtual void OpenDropDownList();
+  // CXFA_FFDropDown
+  void InsertItem(const WideStringView& wsLabel, int32_t nIndex) override;
+  void DeleteItem(int32_t nIndex) override;
+
+  void OpenDropDownList();
 
   void OnTextChanged(CFWL_Widget* pWidget, const WideString& wsChanged);
   void OnSelectChanged(CFWL_Widget* pWidget, bool bLButtonUp);
   void OnPreOpen(CFWL_Widget* pWidget);
   void OnPostOpen(CFWL_Widget* pWidget);
   void SetItemState(int32_t nIndex, bool bSelected);
-  void InsertItem(const WideStringView& wsLabel, int32_t nIndex);
-  void DeleteItem(int32_t nIndex);
 
  private:
   // CXFA_FFField
diff --git a/xfa/fxfa/cxfa_ffdropdown.cpp b/xfa/fxfa/cxfa_ffdropdown.cpp
new file mode 100644
index 0000000000..5175929e12
--- /dev/null
+++ b/xfa/fxfa/cxfa_ffdropdown.cpp
@@ -0,0 +1,11 @@
+// Copyright 2018 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/cxfa_ffdropdown.h"
+
+CXFA_FFDropDown::CXFA_FFDropDown(CXFA_Node* node) : CXFA_FFField(node) {}
+
+CXFA_FFDropDown::~CXFA_FFDropDown() = default;
diff --git a/xfa/fxfa/cxfa_ffdropdown.h b/xfa/fxfa/cxfa_ffdropdown.h
new file mode 100644
index 0000000000..20ed76640b
--- /dev/null
+++ b/xfa/fxfa/cxfa_ffdropdown.h
@@ -0,0 +1,23 @@
+// Copyright 2018 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
+
+#ifndef XFA_FXFA_CXFA_FFDROPDOWN_H_
+#define XFA_FXFA_CXFA_FFDROPDOWN_H_
+
+#include "xfa/fxfa/cxfa_fffield.h"
+
+class CXFA_FFDropDown : public CXFA_FFField {
+ public:
+  ~CXFA_FFDropDown() override;
+
+  virtual void InsertItem(const WideStringView& wsLabel, int32_t nIndex) = 0;
+  virtual void DeleteItem(int32_t nIndex) = 0;
+
+ protected:
+  explicit CXFA_FFDropDown(CXFA_Node* pNode);
+};
+
+#endif  // XFA_FXFA_CXFA_FFDROPDOWN_H_
diff --git a/xfa/fxfa/cxfa_fflistbox.cpp b/xfa/fxfa/cxfa_fflistbox.cpp
index f4e7a5e6c4..92543e3e6b 100644
--- a/xfa/fxfa/cxfa_fflistbox.cpp
+++ b/xfa/fxfa/cxfa_fflistbox.cpp
@@ -25,7 +25,7 @@ CFWL_ListBox* ToListBox(CFWL_Widget* widget) {
 }  // namespace
 
 CXFA_FFListBox::CXFA_FFListBox(CXFA_Node* pNode)
-    : CXFA_FFField(pNode), m_pOldDelegate(nullptr) {}
+    : CXFA_FFDropDown(pNode), m_pOldDelegate(nullptr) {}
 
 CXFA_FFListBox::~CXFA_FFListBox() {
   if (!m_pNormalWidget)
diff --git a/xfa/fxfa/cxfa_fflistbox.h b/xfa/fxfa/cxfa_fflistbox.h
index 27f1cdb8a4..feff0b7cbb 100644
--- a/xfa/fxfa/cxfa_fflistbox.h
+++ b/xfa/fxfa/cxfa_fflistbox.h
@@ -7,9 +7,9 @@
 #ifndef XFA_FXFA_CXFA_FFLISTBOX_H_
 #define XFA_FXFA_CXFA_FFLISTBOX_H_
 
-#include "xfa/fxfa/cxfa_fffield.h"
+#include "xfa/fxfa/cxfa_ffdropdown.h"
 
-class CXFA_FFListBox : public CXFA_FFField {
+class CXFA_FFListBox : public CXFA_FFDropDown {
  public:
   explicit CXFA_FFListBox(CXFA_Node* pNode);
   ~CXFA_FFListBox() override;
@@ -23,10 +23,12 @@ class CXFA_FFListBox : public CXFA_FFField {
                     const CFX_Matrix& matrix) override;
   FormFieldType GetFormFieldType() override;
 
+  // CXFA_FFDropDown
+  void InsertItem(const WideStringView& wsLabel, int32_t nIndex) override;
+  void DeleteItem(int32_t nIndex) override;
+
   void OnSelectChanged(CFWL_Widget* pWidget);
   void SetItemState(int32_t nIndex, bool bSelected);
-  void InsertItem(const WideStringView& wsLabel, int32_t nIndex);
-  void DeleteItem(int32_t nIndex);
 
  private:
   bool CommitData() override;
diff --git a/xfa/fxfa/cxfa_ffnotify.cpp b/xfa/fxfa/cxfa_ffnotify.cpp
index 36f860199a..a7cb91185b 100644
--- a/xfa/fxfa/cxfa_ffnotify.cpp
+++ b/xfa/fxfa/cxfa_ffnotify.cpp
@@ -41,8 +41,8 @@
 
 namespace {
 
-CXFA_FFListBox* ToListBox(CXFA_FFWidget* widget) {
-  return static_cast<CXFA_FFListBox*>(widget);
+CXFA_FFDropDown* ToDropDown(CXFA_FFWidget* widget) {
+  return static_cast<CXFA_FFDropDown*>(widget);
 }
 
 CXFA_FFComboBox* ToComboBox(CXFA_FFWidget* widget) {
@@ -71,12 +71,8 @@ void CXFA_FFNotify::OnWidgetListItemAdded(CXFA_Node* pSender,
 
   CXFA_FFWidget* pWidget = m_pDoc->GetDocView()->GetWidgetForNode(pSender);
   for (; pWidget; pWidget = pSender->GetNextWidget(pWidget)) {
-    if (pWidget->IsLoaded()) {
-      if (pSender->IsListBox())
-        ToListBox(pWidget)->InsertItem(pLabel, iIndex);
-      else
-        ToComboBox(pWidget)->InsertItem(pLabel, iIndex);
-    }
+    if (pWidget->IsLoaded())
+      ToDropDown(pWidget)->InsertItem(pLabel, iIndex);
   }
 }
 
@@ -87,12 +83,8 @@ void CXFA_FFNotify::OnWidgetListItemRemoved(CXFA_Node* pSender,
 
   CXFA_FFWidget* pWidget = m_pDoc->GetDocView()->GetWidgetForNode(pSender);
   for (; pWidget; pWidget = pSender->GetNextWidget(pWidget)) {
-    if (pWidget->IsLoaded()) {
-      if (pSender->IsListBox())
-        ToListBox(pWidget)->DeleteItem(iIndex);
-      else
-        ToComboBox(pWidget)->DeleteItem(iIndex);
-    }
+    if (pWidget->IsLoaded())
+      ToDropDown(pWidget)->DeleteItem(iIndex);
   }
 }