PDF Viewer - Links should open on mouse up

pdf/pdfium/pdfium_engine.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PDF_PDFIUM_PDFIUM_ENGINE_H_
 #define PDF_PDFIUM_PDFIUM_ENGINE_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 491 matching lines @@
   // code still has a pointer to it.
   bool defer_page_unload_;
   std::vector<int> deferred_page_unloads_;
 
   // Used for selection.  There could be more than one range if selection spans
   // more than one page.
   std::vector<PDFiumRange> selection_;
   // True if we're in the middle of selection.
   bool selecting_;
 
+  // Used to store mouse down state to handle it in other mouse event handlers.
+  struct MouseDownState {
+    MouseDownState() {};
+    MouseDownState(PDFiumPage::Area area, PDFiumPage::LinkTarget target)
+        : area_(area), target_(target) {};
+    PDFiumPage::Area area_;
+    PDFiumPage::LinkTarget target_;
+
+    bool operator==(const MouseDownState& rhs) const {
+      return (area_ == rhs.area_) && (target_.url == rhs.target_.url);
+    }
+
+    bool operator!=(const MouseDownState rhs) const {
+      return (area_ != rhs.area_) || (target_.url != rhs.target_.url);
+    }
+  };
+  MouseDownState mouse_down_state_;
+
   // Used for searching.
   typedef std::vector<PDFiumRange> FindResults;
   FindResults find_results_;
   // Which page to search next.
   int next_page_to_search_;
   // Where to stop searching.
   int last_page_to_search_;
   int last_character_index_to_search_;  // -1 if search until end of page.
   // Which result the user has currently selected.
   int current_find_index_;
@@ skipping 103 matching lines @@
 
   // See the definition of GetPDFPageSizeByIndex in pdf.cc for details.
   virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
                                      int pdf_buffer_size, int page_number,
                                      double* width, double* height);
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDFIUM_PDFIUM_ENGINE_H_