Use pdfium::Optional in CPDFSDK_Widget.

Also make some methods const.

Change-Id: Ie2d0f7e691ad9448b4e77227ce3c0b2b065e0da0
Reviewed-on: https://pdfium-review.googlesource.com/c/43602
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

3 files changed, 34 insertions, 25 deletions

diff --git a/fpdfsdk/cpdfsdk_widget.cpp b/fpdfsdk/cpdfsdk_widget.cpp
index 70ad592f6f..c2a4754edc 100644
--- a/fpdfsdk/cpdfsdk_widget.cpp
+++ b/fpdfsdk/cpdfsdk_widget.cpp
@@ -72,7 +72,7 @@ CXFA_FFWidget* CPDFSDK_Widget::GetMixXFAWidget() const {
   return nullptr;
 }
 
-CXFA_FFWidget* CPDFSDK_Widget::GetGroupMixXFAWidget() {
+CXFA_FFWidget* CPDFSDK_Widget::GetGroupMixXFAWidget() const {
   CPDFXFA_Context* pContext = m_pPageView->GetFormFillEnv()->GetXFAContext();
   if (pContext->GetFormType() != FormType::kXFAForeground)
     return nullptr;
@@ -173,7 +173,7 @@ static XFA_EVENTTYPE GetXFAEventType(CPDF_AAction::AActionType eAAT,
   return eEventType;
 }
 
-bool CPDFSDK_Widget::HasXFAAAction(PDFSDK_XFAAActionType eXFAAAT) {
+bool CPDFSDK_Widget::HasXFAAAction(PDFSDK_XFAAActionType eXFAAAT) const {
   CXFA_FFWidget* hWidget = GetMixXFAWidget();
   if (!hWidget)
     return false;
@@ -398,31 +398,37 @@ WideString CPDFSDK_Widget::GetName() const {
 }
 #endif  // PDF_ENABLE_XFA
 
-bool CPDFSDK_Widget::GetFillColor(FX_COLORREF& color) const {
+Optional<FX_COLORREF> CPDFSDK_Widget::GetFillColor() const {
   CPDF_FormControl* pFormCtrl = GetFormControl();
   int iColorType = 0;
-  color = ArgbToColorRef(pFormCtrl->GetBackgroundColor(iColorType));
-  return iColorType != CFX_Color::kTransparent;
+  FX_COLORREF color = ArgbToColorRef(pFormCtrl->GetBackgroundColor(iColorType));
+  if (iColorType == CFX_Color::kTransparent)
+    return {};
+  return color;
 }
 
-bool CPDFSDK_Widget::GetBorderColor(FX_COLORREF& color) const {
+Optional<FX_COLORREF> CPDFSDK_Widget::GetBorderColor() const {
   CPDF_FormControl* pFormCtrl = GetFormControl();
   int iColorType = 0;
-  color = ArgbToColorRef(pFormCtrl->GetBorderColor(iColorType));
-  return iColorType != CFX_Color::kTransparent;
+  FX_COLORREF color = ArgbToColorRef(pFormCtrl->GetBorderColor(iColorType));
+  if (iColorType == CFX_Color::kTransparent)
+    return {};
+  return color;
 }
 
-bool CPDFSDK_Widget::GetTextColor(FX_COLORREF& color) const {
+Optional<FX_COLORREF> CPDFSDK_Widget::GetTextColor() const {
   CPDF_FormControl* pFormCtrl = GetFormControl();
   CPDF_DefaultAppearance da = pFormCtrl->GetDefaultAppearance();
   FX_ARGB argb;
   Optional<CFX_Color::Type> iColorType;
   std::tie(iColorType, argb) = da.GetColor();
-  if (!iColorType)
-    return false;
+  if (!iColorType.has_value())
+    return {};
 
-  color = ArgbToColorRef(argb);
-  return *iColorType != CFX_Color::kTransparent;
+  FX_COLORREF color = ArgbToColorRef(argb);
+  if (iColorType.value() == CFX_Color::kTransparent)
+    return {};
+  return color;
 }
 
 float CPDFSDK_Widget::GetFontSize() const {
diff --git a/fpdfsdk/cpdfsdk_widget.h b/fpdfsdk/cpdfsdk_widget.h
index 6ccfdfd31f..fb83ceb555 100644
--- a/fpdfsdk/cpdfsdk_widget.h
+++ b/fpdfsdk/cpdfsdk_widget.h
@@ -17,6 +17,7 @@
 #include "core/fxge/cfx_color.h"
 #include "fpdfsdk/cpdfsdk_baannot.h"
 #include "fpdfsdk/cpdfsdk_fieldaction.h"
+#include "third_party/base/optional.h"
 
 class CFX_RenderDevice;
 class CPDF_Annot;
@@ -39,7 +40,7 @@ class CPDFSDK_Widget final : public CPDFSDK_BAAnnot {
   CXFA_FFWidget* GetMixXFAWidget() const;
   CXFA_FFWidgetHandler* GetXFAWidgetHandler() const;
 
-  bool HasXFAAAction(PDFSDK_XFAAActionType eXFAAAT);
+  bool HasXFAAAction(PDFSDK_XFAAActionType eXFAAAT) const;
   bool OnXFAAAction(PDFSDK_XFAAActionType eXFAAAT,
                     CPDFSDK_FieldAction* data,
                     CPDFSDK_PageView* pPageView);
@@ -62,9 +63,9 @@ class CPDFSDK_Widget final : public CPDFSDK_BAAnnot {
   int GetFieldFlags() const;
   int GetRotate() const;
 
-  bool GetFillColor(FX_COLORREF& color) const;
-  bool GetBorderColor(FX_COLORREF& color) const;
-  bool GetTextColor(FX_COLORREF& color) const;
+  Optional<FX_COLORREF> GetFillColor() const;
+  Optional<FX_COLORREF> GetBorderColor() const;
+  Optional<FX_COLORREF> GetTextColor() const;
   float GetFontSize() const;
 
   int GetSelectedIndex(int nIndex) const;
@@ -127,7 +128,7 @@ class CPDFSDK_Widget final : public CPDFSDK_BAAnnot {
 
  private:
 #ifdef PDF_ENABLE_XFA
-  CXFA_FFWidget* GetGroupMixXFAWidget();
+  CXFA_FFWidget* GetGroupMixXFAWidget() const;
   WideString GetName() const;
 #endif  // PDF_ENABLE_XFA
 
diff --git a/fpdfsdk/formfiller/cffl_formfiller.cpp b/fpdfsdk/formfiller/cffl_formfiller.cpp
index 4b94bde271..94d80cae01 100644
--- a/fpdfsdk/formfiller/cffl_formfiller.cpp
+++ b/fpdfsdk/formfiller/cffl_formfiller.cpp
@@ -340,16 +340,18 @@ CPWL_Wnd::CreateParams CFFL_FormFiller::GetCreateParam() {
   if (dwFieldFlag & FIELDFLAG_READONLY)
     dwCreateFlags |= PWS_READONLY;
 
-  FX_COLORREF color;
-  if (m_pWidget->GetFillColor(color))
-    cp.sBackgroundColor = CFX_Color(color);
-  if (m_pWidget->GetBorderColor(color))
-    cp.sBorderColor = CFX_Color(color);
+  Optional<FX_COLORREF> color = m_pWidget->GetFillColor();
+  if (color.has_value())
+    cp.sBackgroundColor = CFX_Color(color.value());
+  color = m_pWidget->GetBorderColor();
+  if (color.has_value())
+    cp.sBorderColor = CFX_Color(color.value());
 
   cp.sTextColor = CFX_Color(CFX_Color::kGray, 0);
 
-  if (m_pWidget->GetTextColor(color))
-    cp.sTextColor = CFX_Color(color);
+  color = m_pWidget->GetTextColor();
+  if (color.has_value())
+    cp.sTextColor = CFX_Color(color.value());
 
   cp.fFontSize = m_pWidget->GetFontSize();
   cp.dwBorderWidth = m_pWidget->GetBorderWidth();