printing/page_number.cc

   1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "printing/page_number.h"
   6
   7 #include <limits>
   8
   9 #include "base/logging.h"
  10 #include "printing/print_settings.h"
  11
  12 namespace printing {
  13
  14 PageNumber::PageNumber(const PrintSettings& settings, int document_page_count) {
  15   Init(settings, document_page_count);
  16 }
  17
  18 PageNumber::PageNumber()
  19     : ranges_(NULL),
  20       page_number_(-1),
  21       page_range_index_(-1),
  22       document_page_count_(0) {
  23 }
  24
  25 void PageNumber::operator=(const PageNumber& other) {
  26   ranges_ = other.ranges_;
  27   page_number_ = other.page_number_;
  28   page_range_index_ = other.page_range_index_;
  29   document_page_count_ = other.document_page_count_;
  30 }
  31
  32 void PageNumber::Init(const PrintSettings& settings, int document_page_count) {
  33   DCHECK(document_page_count);
  34   ranges_ = settings.ranges().empty() ? NULL : &settings.ranges();
  35   document_page_count_ = document_page_count;
  36   if (ranges_) {
  37     page_range_index_ = 0;
  38     page_number_ = (*ranges_)[0].from;
  39   } else {
  40     if (document_page_count) {
  41       page_number_ = 0;
  42     } else {
  43       page_number_ = -1;
  44     }
  45     page_range_index_ = -1;
  46   }
  47 }
  48
  49 int PageNumber::operator++() {
  50   if (!ranges_) {
  51     // Switch to next page.
  52     if (++page_number_ == document_page_count_) {
  53       // Finished.
  54       *this = npos();
  55     }
  56   } else {
  57     // Switch to next page.
  58     ++page_number_;
  59     // Page ranges are inclusive.
  60     if (page_number_ > (*ranges_)[page_range_index_].to) {
  61       DCHECK(ranges_->size() <= static_cast<size_t>(
  62           std::numeric_limits<int>::max()));
  63       if (++page_range_index_ == static_cast<int>(ranges_->size())) {
  64         // Finished.
  65         *this = npos();
  66       } else {
  67         page_number_ = (*ranges_)[page_range_index_].from;
  68       }
  69     }
  70   }
  71   return ToInt();
  72 }
  73
  74 bool PageNumber::operator==(const PageNumber& other) const {
  75   return page_number_ == other.page_number_ &&
  76          page_range_index_ == other.page_range_index_;
  77 }
  78 bool PageNumber::operator!=(const PageNumber& other) const {
  79   return page_number_ != other.page_number_ ||
  80          page_range_index_ != other.page_range_index_;
  81 }
  82
  83 }  // namespace printing