Fix caret not appearing in XFA Edits.

This makes the caret appear (again?), blink, and fixes its positioning
to be a little spaced from the last character.

Known issue: when the edit is empty, the caret is not necessarily
aligned with where the text will be.

Bug: chromium:592750
Change-Id: I950b0ea236db8855c6ed50f48ec1935d97e6ccf8
Reviewed-on: https://pdfium-review.googlesource.com/25451
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

6 files changed, 32 insertions, 16 deletions

diff --git a/xfa/fde/cfde_texteditengine.cpp b/xfa/fde/cfde_texteditengine.cpp
index d085a8d147..75fd103b3c 100644
--- a/xfa/fde/cfde_texteditengine.cpp
+++ b/xfa/fde/cfde_texteditengine.cpp
@@ -1071,10 +1071,8 @@ std::pair<int32_t, CFX_RectF> CFDE_TextEditEngine::GetCharacterInfo(
     if (it->nStart <= start_idx && start_idx < it->nStart + it->nCount)
       break;
   }
-  if (it == text_piece_info_.end()) {
-    NOTREACHED();
+  if (it == text_piece_info_.end())
     return {0, CFX_RectF()};
-  }
 
   return {it->nBidiLevel, GetCharRects(*it)[start_idx - it->nStart]};
 }
diff --git a/xfa/fwl/cfwl_caret.cpp b/xfa/fwl/cfwl_caret.cpp
index cd85041d92..03c8ffde68 100644
--- a/xfa/fwl/cfwl_caret.cpp
+++ b/xfa/fwl/cfwl_caret.cpp
@@ -58,17 +58,21 @@ void CFWL_Caret::DrawWidget(CXFA_Graphics* pGraphics,
 }
 
 void CFWL_Caret::ShowCaret() {
-  if (m_pTimerInfo)
-    m_pTimerInfo->StopTimer();
+  if (m_pTimerInfo) {
+    CFWL_TimerInfo* pOldTimerInfo = m_pTimerInfo.Release();
+    pOldTimerInfo->StopTimer();
+  }
+
   m_pTimerInfo = m_pTimer->StartTimer(kFrequency, true);
   RemoveStates(FWL_WGTSTATE_Invisible);
 }
 
 void CFWL_Caret::HideCaret() {
   if (m_pTimerInfo) {
-    m_pTimerInfo->StopTimer();
-    m_pTimerInfo = nullptr;
+    CFWL_TimerInfo* pOldTimerInfo = m_pTimerInfo.Release();
+    pOldTimerInfo->StopTimer();
   }
+
   SetStates(FWL_WGTSTATE_Invisible);
 }
 
diff --git a/xfa/fwl/cfwl_edit.cpp b/xfa/fwl/cfwl_edit.cpp
index 960ec9967a..051c39f74e 100644
--- a/xfa/fwl/cfwl_edit.cpp
+++ b/xfa/fwl/cfwl_edit.cpp
@@ -79,7 +79,6 @@ CFWL_Edit::CFWL_Edit(const CFWL_App* app,
   m_rtEngine.Reset();
   m_rtStatic.Reset();
 
-  InitCaret();
   m_EdtEngine.SetDelegate(this);
 }
 
@@ -1065,8 +1064,14 @@ bool CFWL_Edit::ValidateNumberChar(wchar_t cNum) {
 }
 
 void CFWL_Edit::InitCaret() {
-  m_pCaret.reset();
-  m_rtCaret = CFX_RectF();
+  if (m_pCaret)
+    return;
+
+  m_pCaret = pdfium::MakeUnique<CFWL_Caret>(
+      m_pOwnerApp.Get(), pdfium::MakeUnique<CFWL_WidgetProperties>(), this);
+  m_pCaret->SetParent(this);
+  m_pCaret->SetStates(m_pProperties->m_dwStates);
+  UpdateCursorRect();
 }
 
 void CFWL_Edit::UpdateCursorRect() {
@@ -1076,10 +1081,12 @@ void CFWL_Edit::UpdateCursorRect() {
       m_EdtEngine.GetCharacterInfo(m_CursorPosition);
   // TODO(dsinclair): This should handle bidi level  ...
 
-  if (m_rtCaret.width == 0 && m_rtCaret.left > 1.0f)
-    m_rtCaret.left -= 1.0f;
-
   m_rtCaret.width = 1.0f;
+
+  // TODO(hnakashima): Handle correctly edits with empty text instead of using
+  // these defaults.
+  if (m_rtCaret.height == 0)
+    m_rtCaret.height = 8.0f;
 }
 
 void CFWL_Edit::SetCursorPosition(size_t position) {
diff --git a/xfa/fwl/cfwl_timer.cpp b/xfa/fwl/cfwl_timer.cpp
index 2734e49d78..597f928ba0 100644
--- a/xfa/fwl/cfwl_timer.cpp
+++ b/xfa/fwl/cfwl_timer.cpp
@@ -25,11 +25,13 @@ CFWL_TimerInfo* CFWL_Timer::StartTimer(uint32_t dwElapse, bool bImmediately) {
   if (!pAdapterNative)
     return nullptr;
 
-  IFWL_AdapterTimerMgr* pAdapterTimerMgr = pAdapterNative->GetTimerMgr();
-  if (!pAdapterTimerMgr)
+  if (!m_pTimeMgrAdapter)
+    m_pTimeMgrAdapter.reset(pAdapterNative->GetTimerMgr());
+
+  if (!m_pTimeMgrAdapter)
     return nullptr;
 
   CFWL_TimerInfo* pTimerInfo = nullptr;
-  pAdapterTimerMgr->Start(this, dwElapse, bImmediately, &pTimerInfo);
+  m_pTimeMgrAdapter->Start(this, dwElapse, bImmediately, &pTimerInfo);
   return pTimerInfo;
 }
diff --git a/xfa/fwl/cfwl_timer.h b/xfa/fwl/cfwl_timer.h
index da1b4437e2..355ea69d67 100644
--- a/xfa/fwl/cfwl_timer.h
+++ b/xfa/fwl/cfwl_timer.h
@@ -7,11 +7,14 @@
 #ifndef XFA_FWL_CFWL_TIMER_H_
 #define XFA_FWL_CFWL_TIMER_H_
 
+#include <memory>
+
 #include "core/fxcrt/fx_system.h"
 #include "core/fxcrt/unowned_ptr.h"
 
 class CFWL_TimerInfo;
 class CFWL_Widget;
+class IFWL_AdapterTimerMgr;
 
 class CFWL_Timer {
  public:
@@ -23,6 +26,7 @@ class CFWL_Timer {
 
  protected:
   UnownedPtr<CFWL_Widget> m_pWidget;
+  std::unique_ptr<IFWL_AdapterTimerMgr> m_pTimeMgrAdapter;
 };
 
 #endif  // XFA_FWL_CFWL_TIMER_H_
diff --git a/xfa/fwl/ifwl_adaptertimermgr.h b/xfa/fwl/ifwl_adaptertimermgr.h
index 1f655892ea..23627d9191 100644
--- a/xfa/fwl/ifwl_adaptertimermgr.h
+++ b/xfa/fwl/ifwl_adaptertimermgr.h
@@ -11,6 +11,7 @@
 
 class IFWL_AdapterTimerMgr {
  public:
+  virtual ~IFWL_AdapterTimerMgr() {}
   virtual void Start(CFWL_Timer* pTimer,
                      uint32_t dwElapse,
                      bool bImmediately,