Fix for Multipage selection by dragging mouse in OOP case in PDF.

pdf/pdfium/pdfium_engine.cc

 // 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.
 
 #include "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 1712 matching lines @@
     OnSingleClick(page_index, char_index);
   } else if (event.GetClickCount() == 2 ||
              event.GetClickCount() == 3) {
     OnMultipleClick(event.GetClickCount(), page_index, char_index);
   }
 
   return true;
 }
 
 void PDFiumEngine::OnSingleClick(int page_index, int char_index) {
-  selecting_ = true;
+  SetSelecting(true);
   selection_.push_back(PDFiumRange(pages_[page_index], char_index, 0));
 }
 
 void PDFiumEngine::OnMultipleClick(int click_count,
                                    int page_index,
                                    int char_index) {
   // It would be more efficient if the SDK could support finding a space, but
   // now it doesn't.
   int start_index = char_index;
   do {
@@ skipping 42 matching lines @@
     double page_x, page_y;
     pp::Point point = event.GetPosition();
     DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
     FORM_OnLButtonUp(
         form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
   }
 
   if (!selecting_)
     return false;
 
-  selecting_ = false;
+  SetSelecting(false);
   return true;
 }
 
 bool PDFiumEngine::OnMouseMove(const pp::MouseInputEvent& event) {
   int page_index = -1;
   int char_index = -1;
   PDFiumPage::LinkTarget target;
   PDFiumPage::Area area =
       GetCharIndex(event, &page_index, &char_index, &target);
 
@@ skipping 1655 matching lines @@
 
   InvalidateAllPages();
 
   if (!current_find_text.empty()) {
     // Clear the UI.
     client_->NotifyNumberOfFindResultsChanged(0, false);
     StartFind(current_find_text.c_str(), false);
   }
 }
 
+void PDFiumEngine::SetSelecting(bool selecting) {
+  bool was_selecting = selecting_;
+  selecting_ = selecting;
+  if (selecting_ != was_selecting)
+    client_->IsSelectingChanged(selecting);
+}
+
 void PDFiumEngine::Form_Invalidate(FPDF_FORMFILLINFO* param,
                                    FPDF_PAGE page,
                                    double left,
                                    double top,
                                    double right,
                                    double bottom) {
   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
   int page_index = engine->GetVisiblePageIndex(page);
   if (page_index == -1) {
     // This can sometime happen when the page is closed because it went off
@@ skipping 536 matching lines @@
     double* height) {
   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf