Handle overlapping links and widgets.

core/src/fpdfdoc/doc_link.cpp

 // Copyright 2014 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 "../../include/fpdfdoc/fpdf_doc.h"
 #include "../../src/fxcrt/fx_safe_types.h"
 
+CPDF_LinkList::CPDF_LinkList()
+{
+}
 CPDF_LinkList::~CPDF_LinkList()
 {
     FX_POSITION pos = m_PageMap.GetStartPosition();
     while (pos) {
         FX_LPVOID key, value;
         m_PageMap.GetNextAssoc(pos, key, value);
         delete (CFX_PtrArray*)value;
     }
 }
 CFX_PtrArray* CPDF_LinkList::GetPageLinks(CPDF_Page* pPage)
 {
     FX_DWORD objnum = pPage->m_pFormDict->GetObjNum();
     if (objnum == 0) {
         return NULL;
     }
     CFX_PtrArray* pPageLinkList = NULL;
     if (!m_PageMap.Lookup((FX_LPVOID)(FX_UINTPTR)objnum, (FX_LPVOID&)pPageLinkList)) {
         pPageLinkList = FX_NEW CFX_PtrArray;
         if (pPageLinkList == NULL) {
             return NULL;
         }
         m_PageMap.SetAt((FX_LPVOID)(FX_UINTPTR)objnum, pPageLinkList);
         LoadPageLinks(pPage, pPageLinkList);
     }
     return pPageLinkList;
 }
-int CPDF_LinkList::CountLinks(CPDF_Page* pPage)
+FX_BOOL CPDF_LinkList::IsLink(CPDF_Dictionary* pAnnot)
 {
-    CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
-    if (pPageLinkList == NULL) {
-        return 0;
-    }
-    return pPageLinkList->GetSize();
+    return pAnnot->GetString("Subtype") == "Link";
 }
-CPDF_Link CPDF_LinkList::GetLink(CPDF_Page* pPage, int index)
+FX_BOOL CPDF_LinkList::IsWidget(CPDF_Dictionary* pAnnot)
 {
-    CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
-    if (pPageLinkList == NULL) {
-        return NULL;
-    }
-    return (CPDF_Dictionary*)pPageLinkList->GetAt(index);
+    return pAnnot->GetString("Subtype") == "Widget";
+}
+CPDF_Rect CPDF_LinkList::GetWidgetRect(CPDF_Dictionary* pWidget)
+{
+    return pWidget->GetRect("Rect");
 }
 CPDF_Link CPDF_LinkList::GetLinkAtPoint(CPDF_Page* pPage, FX_FLOAT pdf_x, FX_FLOAT pdf_y)
 {
     CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
     if (pPageLinkList == NULL) {
         return NULL;
     }
     int size = pPageLinkList->GetSize();
     for (int i = size - 1; i >= 0; --i) {
-        CPDF_Link Link = (CPDF_Dictionary*)pPageLinkList->GetAt(i);
-        CPDF_Rect rect = Link.GetRect();
-        if (rect.Contains(pdf_x, pdf_y)) {
-            return Link;
+        CPDF_Dictionary* pAnnot = (CPDF_Dictionary*)pPageLinkList->GetAt(i);
+        if (IsLink(pAnnot)) {
+            CPDF_Link link(pAnnot);
+            CPDF_Rect rect = link.GetRect();
+            if (rect.Contains(pdf_x, pdf_y)) {
+                return link;
+            }
+        } else if (IsWidget(pAnnot)) {
+            CPDF_Rect rect = GetWidgetRect(pAnnot);
+            if (rect.Contains(pdf_x, pdf_y)) {
+                return NULL;
+            }
         }
     }
     return NULL;
 }
 void CPDF_LinkList::LoadPageLinks(CPDF_Page* pPage, CFX_PtrArray* pList)
 {
     CPDF_Array* pAnnotList = pPage->m_pFormDict->GetArray("Annots");
     if (pAnnotList == NULL) {
         return;
     }
     for (FX_DWORD i = 0; i < pAnnotList->GetCount(); i ++) {
         CPDF_Dictionary* pAnnot = pAnnotList->GetDict(i);
         if (pAnnot == NULL) {
             continue;
         }
-        if (pAnnot->GetString("Subtype") != "Link") {
-            continue;
+        if (IsLink(pAnnot) || IsWidget(pAnnot)) {
+            pList->Add(pAnnot);
         }
-        pList->Add(pAnnot);
     }
 }
 CPDF_Rect CPDF_Link::GetRect()
 {
     return m_pDict->GetRect("Rect");
 }
 CPDF_Dest CPDF_Link::GetDest(CPDF_Document* pDoc)
 {
     CPDF_Object* pDest = m_pDict->GetElementValue("Dest");
     if (pDest == NULL) {
         return NULL;
     }
     if (pDest->GetType() == PDFOBJ_STRING || pDest->GetType() == PDFOBJ_NAME) {
         CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
         CFX_ByteStringC name = pDest->GetString();
         return name_tree.LookupNamedDest(pDoc, name);
     } else if (pDest->GetType() == PDFOBJ_ARRAY) {
         return (CPDF_Array*)pDest;
     }
     return NULL;
 }
 CPDF_Action CPDF_Link::GetAction()
 {
     return m_pDict->GetDict("A");
 }