Make CPWL_Wnd own its pAttachedData.

This requires moving it out of CreateParams, since that must be
a copyable struct, and implies that currently there is some
questionable sharing going on. To resolve this, introduce a
Clone() method so that each window gets its own copy.

Make GetAttachedData() return a const pointer, so that callers
can't free it behind our back.

Tidy initializations along the way.

Change-Id: Iadc97688b4692bf4fafefe8cff88af88672f7110
Reviewed-on: https://pdfium-review.googlesource.com/c/44590
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 17 insertions, 7 deletions

diff --git a/fpdfsdk/pwl/cpwl_combo_box.cpp b/fpdfsdk/pwl/cpwl_combo_box.cpp
index 341bd93e41..bb5890b519 100644
--- a/fpdfsdk/pwl/cpwl_combo_box.cpp
+++ b/fpdfsdk/pwl/cpwl_combo_box.cpp
@@ -8,6 +8,7 @@
 
 #include <algorithm>
 #include <sstream>
+#include <utility>
 
 #include "core/fxge/cfx_pathdata.h"
 #include "core/fxge/cfx_renderdevice.h"
@@ -26,6 +27,11 @@ constexpr int kDefaultButtonWidth = 13;
 
 }  // namespace
 
+CPWL_CBListBox::CPWL_CBListBox(std::unique_ptr<PrivateData> pAttachedData)
+    : CPWL_ListBox(std::move(pAttachedData)) {}
+
+CPWL_CBListBox::~CPWL_CBListBox() = default;
+
 bool CPWL_CBListBox::OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) {
   CPWL_Wnd::OnLButtonUp(point, nFlag);
 
@@ -94,6 +100,11 @@ bool CPWL_CBListBox::OnCharNotify(uint16_t nChar, uint32_t nFlag) {
   return OnNotifySelectionChanged(true, nFlag);
 }
 
+CPWL_CBButton::CPWL_CBButton(std::unique_ptr<PrivateData> pAttachedData)
+    : CPWL_Wnd(std::move(pAttachedData)) {}
+
+CPWL_CBButton::~CPWL_CBButton() = default;
+
 void CPWL_CBButton::DrawThisAppearance(CFX_RenderDevice* pDevice,
                                        const CFX_Matrix& mtUser2Device) {
   CPWL_Wnd::DrawThisAppearance(pDevice, mtUser2Device);
@@ -132,7 +143,6 @@ bool CPWL_CBButton::OnLButtonDown(const CFX_PointF& point, uint32_t nFlag) {
   CPWL_Wnd::OnLButtonDown(point, nFlag);
 
   SetCapture();
-
   if (CPWL_Wnd* pParent = GetParentWindow())
     pParent->NotifyLButtonDown(this, point);
 
@@ -143,13 +153,13 @@ bool CPWL_CBButton::OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) {
   CPWL_Wnd::OnLButtonUp(point, nFlag);
 
   ReleaseCapture();
-
   return true;
 }
 
-CPWL_ComboBox::CPWL_ComboBox() {}
+CPWL_ComboBox::CPWL_ComboBox(std::unique_ptr<PrivateData> pAttachedData)
+    : CPWL_Wnd(std::move(pAttachedData)) {}
 
-CPWL_ComboBox::~CPWL_ComboBox() {}
+CPWL_ComboBox::~CPWL_ComboBox() = default;
 
 void CPWL_ComboBox::OnCreate(CreateParams* pParamsToAdjust) {
   pParamsToAdjust->dwFlags &= ~PWS_HSCROLL;
@@ -262,7 +272,7 @@ void CPWL_ComboBox::CreateEdit(const CreateParams& cp) {
   if (m_pEdit)
     return;
 
-  m_pEdit = new CPWL_Edit();
+  m_pEdit = new CPWL_Edit(CloneAttachedData());
   m_pEdit->AttachFFLData(m_pFormFiller.Get());
 
   CreateParams ecp = cp;
@@ -286,7 +296,7 @@ void CPWL_ComboBox::CreateButton(const CreateParams& cp) {
   if (m_pButton)
     return;
 
-  m_pButton = new CPWL_CBButton;
+  m_pButton = new CPWL_CBButton(CloneAttachedData());
 
   CreateParams bcp = cp;
   bcp.pParentWnd = this;
@@ -304,7 +314,7 @@ void CPWL_ComboBox::CreateListBox(const CreateParams& cp) {
   if (m_pList)
     return;
 
-  m_pList = new CPWL_CBListBox();
+  m_pList = new CPWL_CBListBox(CloneAttachedData());
   m_pList->AttachFFLData(m_pFormFiller.Get());
 
   CreateParams lcp = cp;