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 {
+
+CPDF_Annot* CreatePopupAnnot(CPDF_Annot* pAnnot, CPDF_Document* pDocument) {

[dsinclair, 2016/08/24 14:00:20]

Can this return a std::unique_ptr<CPDF_Annot> to show the ownership transfer? 

[jaepark, 2016/08/24 18:37:48]

Done.

+  CPDF_Dictionary* pParentDict = pAnnot->GetAnnotDict();
+  if (!pParentDict)
+    return nullptr;
+
+  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");
+  CFX_FloatRect popupRect(0, 0, 200, 200);

[dsinclair, 2016/08/24 14:00:20]

Where does 200 come from? Is it spec, or just a number?

[jaepark, 2016/08/24 18:37:48]

This is just a number. This represents the rectangle of the popup note that'll
be shown.

+  popupRect.Translate((rect.left + rect.right) / 2,

[dsinclair, 2016/08/24 14:00:20]

Why left + right and not left + popupRect.width? if left + right is bigger then
200 won't this get placed strange?

[jaepark, 2016/08/24 18:37:48]

I wanted to place the popup note in the middle of the original annotation, which
is (rect.left + rect.right) / 2. But I now think that it's better to place the
popup at the left side of annotation so that it aligns with  the original
annotation. Fixed accordingly.

+                      rect.bottom - popupRect.Height());
+
+  pAnnotDict->SetAtRect("Rect", popupRect);
+  pAnnotDict->SetAtInteger("F", 0);
+
+  CPDF_Annot* pPopupAnnot = new CPDF_Annot(pAnnotDict, pDocument);
+  pAnnot->SetPopupAnnot(pPopupAnnot);
+  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)));
+
+    CPDF_Annot* pAnnot = new CPDF_Annot(pDict, m_pDocument);
+    m_AnnotList.push_back(WrapUnique(pAnnot));
+    m_AnnotList.push_back(WrapUnique(CreatePopupAnnot(pAnnot, m_pDocument)));
+
     if (bRegenerateAP && pDict->GetStringBy("Subtype") == "Widget" &&
         CPDF_InterForm::IsUpdateAPEnabled()) {
       FPDF_GenerateAP(m_pDocument, pDict);
     }
   }
 }
 
 CPDF_AnnotList::~CPDF_AnnotList() {}
 
 void CPDF_AnnotList::DisplayPass(CPDF_Page* pPage,
@@ skipping 69 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);
 }