Watch destruction of widgets around OnAAction() method

fpdfsdk/include/ipdfsdk_annothandler.h

 // Copyright 2016 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 FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_
 #define FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_
 
 #include "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_coordinates.h"
+#include "fpdfsdk/include/cpdfsdk_annot.h"
 
 class CFX_Matrix;
 class CFX_RenderDevice;
 class CPDF_Annot;
-class CPDFSDK_Annot;
 class CPDFSDK_PageView;
 
 #ifdef PDF_ENABLE_XFA
 class CXFA_FFWidget;
 #endif  // PDF_ENABLE_XFA
 
 class IPDFSDK_AnnotHandler {
  public:
   virtual ~IPDFSDK_AnnotHandler() {}
 
@@ skipping 15 matching lines @@
                           const CFX_FloatPoint& point) = 0;
   virtual void OnDraw(CPDFSDK_PageView* pPageView,
                       CPDFSDK_Annot* pAnnot,
                       CFX_RenderDevice* pDevice,
                       CFX_Matrix* pUser2Device,
                       bool bDrawAnnots) = 0;
   virtual void OnCreate(CPDFSDK_Annot* pAnnot) = 0;
   virtual void OnLoad(CPDFSDK_Annot* pAnnot) = 0;
   virtual void OnDelete(CPDFSDK_Annot* pAnnot) = 0;
   virtual void OnRelease(CPDFSDK_Annot* pAnnot) = 0;
+
   virtual void OnMouseEnter(CPDFSDK_PageView* pPageView,
-                            CPDFSDK_Annot* pAnnot,
+                            CPDFSDK_Annot::ObservedPtr* pAnnot,
                             uint32_t nFlag) = 0;
   virtual void OnMouseExit(CPDFSDK_PageView* pPageView,
-                           CPDFSDK_Annot* pAnnot,
+                           CPDFSDK_Annot::ObservedPtr* pAnnot,
                            uint32_t nFlag) = 0;
   virtual FX_BOOL OnLButtonDown(CPDFSDK_PageView* pPageView,
-                                CPDFSDK_Annot* pAnnot,
+                                CPDFSDK_Annot::ObservedPtr* pAnnot,
                                 uint32_t nFlags,
                                 const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnLButtonUp(CPDFSDK_PageView* pPageView,
-                              CPDFSDK_Annot* pAnnot,
+                              CPDFSDK_Annot::ObservedPtr* pAnnot,
                               uint32_t nFlags,
                               const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnLButtonDblClk(CPDFSDK_PageView* pPageView,
-                                  CPDFSDK_Annot* pAnnot,
+                                  CPDFSDK_Annot::ObservedPtr* pAnnot,
                                   uint32_t nFlags,
                                   const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnMouseMove(CPDFSDK_PageView* pPageView,
-                              CPDFSDK_Annot* pAnnot,
+                              CPDFSDK_Annot::ObservedPtr* pAnnot,
                               uint32_t nFlags,
                               const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnMouseWheel(CPDFSDK_PageView* pPageView,
-                               CPDFSDK_Annot* pAnnot,
+                               CPDFSDK_Annot::ObservedPtr* pAnnot,
                                uint32_t nFlags,
                                short zDelta,
                                const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnRButtonDown(CPDFSDK_PageView* pPageView,
-                                CPDFSDK_Annot* pAnnot,
+                                CPDFSDK_Annot::ObservedPtr* pAnnot,
                                 uint32_t nFlags,
                                 const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnRButtonUp(CPDFSDK_PageView* pPageView,
-                              CPDFSDK_Annot* pAnnot,
+                              CPDFSDK_Annot::ObservedPtr* pAnnot,
                               uint32_t nFlags,
                               const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnRButtonDblClk(CPDFSDK_PageView* pPageView,
-                                  CPDFSDK_Annot* pAnnot,
+                                  CPDFSDK_Annot::ObservedPtr* pAnnot,
                                   uint32_t nFlags,
                                   const CFX_FloatPoint& point) = 0;
   virtual FX_BOOL OnChar(CPDFSDK_Annot* pAnnot,
                          uint32_t nChar,
                          uint32_t nFlags) = 0;
   virtual FX_BOOL OnKeyDown(CPDFSDK_Annot* pAnnot, int nKeyCode, int nFlag) = 0;
   virtual FX_BOOL OnKeyUp(CPDFSDK_Annot* pAnnot, int nKeyCode, int nFlag) = 0;
   virtual void OnDeSelected(CPDFSDK_Annot* pAnnot) = 0;
   virtual void OnSelected(CPDFSDK_Annot* pAnnot) = 0;
-  virtual FX_BOOL OnSetFocus(CPDFSDK_Annot* pAnnot, uint32_t nFlag) = 0;
-  virtual FX_BOOL OnKillFocus(CPDFSDK_Annot* pAnnot, uint32_t nFlag) = 0;
+  virtual FX_BOOL OnSetFocus(CPDFSDK_Annot::ObservedPtr* pAnnot,
+                             uint32_t nFlag) = 0;
+  virtual FX_BOOL OnKillFocus(CPDFSDK_Annot::ObservedPtr* pAnnot,
+                              uint32_t nFlag) = 0;
 #ifdef PDF_ENABLE_XFA
-  virtual FX_BOOL OnXFAChangedFocus(CPDFSDK_Annot* pOldAnnot,
-                                    CPDFSDK_Annot* pNewAnnot) = 0;
+  virtual FX_BOOL OnXFAChangedFocus(CPDFSDK_Annot::ObservedPtr* pOldAnnot,
+                                    CPDFSDK_Annot::ObservedPtr* pNewAnnot) = 0;
 #endif  // PDF_ENABLE_XFA
 };
 
 #endif  // FPDFSDK_INCLUDE_IPDFSDK_ANNOTHANDLER_H_