Display content of the annotation when mouse hover.

core/fpdfdoc/cpdf_annotlist.cpp

 // 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
 
 #include "core/fpdfdoc/include/cpdf_annotlist.h"
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_reference.h"
 #include "core/fpdfapi/fpdf_render/include/cpdf_renderoptions.h"
 #include "core/fpdfdoc/cpvt_generateap.h"
 #include "core/fpdfdoc/include/cpdf_annot.h"
 #include "core/fpdfdoc/include/cpdf_interform.h"
 #include "core/fpdfdoc/include/cpdf_occontext.h"
 #include "core/fxge/include/cfx_renderdevice.h"
 
+namespace {
+
+std::unique_ptr<CPDF_Annot> CreatePopupAnnot(CPDF_Annot* pAnnot,
+                                             CPDF_Document* pDocument) {
+  CPDF_Dictionary* pParentDict = pAnnot->GetAnnotDict();
+  if (!pParentDict)
+    return std::unique_ptr<CPDF_Annot>();
+
+  CPDF_Dictionary* pAnnotDict = new CPDF_Dictionary;
+  pAnnotDict->SetAtName("Type", "Annot");
+  pAnnotDict->SetAtName("Subtype", "Popup");
+  pAnnotDict->SetAtString("T", pParentDict->GetStringBy("T"));
+  pAnnotDict->SetAtString("Contents", pParentDict->GetStringBy("Contents"));
+
+  CFX_FloatRect rect = pParentDict->GetRectBy("Rect");
+  rect.Normalize();
+  CFX_FloatRect popupRect(0, 0, 200, 200);
+  popupRect.Translate(rect.left, rect.bottom - popupRect.Height());
+
+  pAnnotDict->SetAtRect("Rect", popupRect);
+  pAnnotDict->SetAtInteger("F", 0);
+
+  std::unique_ptr<CPDF_Annot> pPopupAnnot(
+      new CPDF_Annot(pAnnotDict, pDocument));
+  pAnnot->SetPopupAnnot(pPopupAnnot.get());
+  return pPopupAnnot;
+}
+
+}  // namespace
+
 CPDF_AnnotList::CPDF_AnnotList(CPDF_Page* pPage)
     : m_pDocument(pPage->m_pDocument) {
   if (!pPage->m_pFormDict)
     return;
 
   CPDF_Array* pAnnots = pPage->m_pFormDict->GetArrayBy("Annots");
   if (!pAnnots)
     return;
 
   CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
   CPDF_Dictionary* pAcroForm = pRoot->GetDictBy("AcroForm");
   FX_BOOL bRegenerateAP =
       pAcroForm && pAcroForm->GetBooleanBy("NeedAppearances");
   for (size_t i = 0; i < pAnnots->GetCount(); ++i) {
     CPDF_Dictionary* pDict = ToDictionary(pAnnots->GetDirectObjectAt(i));
     if (!pDict)
       continue;
 
     uint32_t dwObjNum = pDict->GetObjNum();
     if (dwObjNum == 0) {
       dwObjNum = m_pDocument->AddIndirectObject(pDict);
       CPDF_Reference* pAction = new CPDF_Reference(m_pDocument, dwObjNum);
       pAnnots->InsertAt(i, pAction);
       pAnnots->RemoveAt(i + 1);
       pDict = pAnnots->GetDictAt(i);
     }
+
     m_AnnotList.push_back(
         std::unique_ptr<CPDF_Annot>(new CPDF_Annot(pDict, m_pDocument)));
+
     if (bRegenerateAP && pDict->GetStringBy("Subtype") == "Widget" &&
         CPDF_InterForm::IsUpdateAPEnabled()) {
       FPDF_GenerateAP(m_pDocument, pDict);
     }
   }
+
+  size_t nAnnotListCount = m_AnnotList.size();

[Lei Zhang, 2016/08/27 02:16:53]

no need for variable.

[jaepark, 2016/08/29 21:19:24]

Actually, the below for loop is pushing back to the same m_AnnotList, so I think
it will cause infinite forloop if we use m_AnnotList.size() as condition.

+  for (size_t i = 0; i < nAnnotListCount; ++i)
+    m_AnnotList.push_back(CreatePopupAnnot(m_AnnotList[i].get(), m_pDocument));
 }
 
 CPDF_AnnotList::~CPDF_AnnotList() {}
 
 void CPDF_AnnotList::DisplayPass(CPDF_Page* pPage,
                                  CFX_RenderDevice* pDevice,
                                  CPDF_RenderContext* pContext,
                                  FX_BOOL bPrinting,
                                  CFX_Matrix* pMatrix,
                                  FX_BOOL bWidgetPass,
@@ skipping 63 matching lines @@
                                    CPDF_RenderContext* pContext,
                                    FX_BOOL bPrinting,
                                    CFX_Matrix* pMatrix,
                                    FX_BOOL bShowWidget,
                                    CPDF_RenderOptions* pOptions) {
   uint32_t dwAnnotFlags = bShowWidget ? ANNOTFLAG_INVISIBLE | ANNOTFLAG_HIDDEN
                                       : ANNOTFLAG_INVISIBLE;
   DisplayAnnots(pPage, nullptr, pContext, bPrinting, pMatrix, dwAnnotFlags,
                 pOptions, nullptr);
 }