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 <stddef.h>
   8
   9 #include <limits>
  10
  11 #include "base/logging.h"
  12 #include "printing/print_settings.h"
  13
  14 namespace printing {
  15
  16 PageNumber::PageNumber(const PrintSettings& settings, int document_page_count) {
  17   Init(settings, document_page_count);
  18 }
  19
  20 PageNumber::PageNumber()
  21     : ranges_(NULL),
  22       page_number_(-1),
  23       page_range_index_(-1),
  24       document_page_count_(0) {
  25 }
  26
  27 void PageNumber::operator=(const PageNumber& other) {
  28   ranges_ = other.ranges_;
  29   page_number_ = other.page_number_;
  30   page_range_index_ = other.page_range_index_;
  31   document_page_count_ = other.document_page_count_;
  32 }
  33
  34 void PageNumber::Init(const PrintSettings& settings, int document_page_count) {
  35   DCHECK(document_page_count);
  36   ranges_ = settings.ranges().empty() ? NULL : &settings.ranges();
  37   document_page_count_ = document_page_count;
  38   if (ranges_) {
  39     page_range_index_ = 0;
  40     page_number_ = (*ranges_)[0].from;
  41   } else {
  42     if (document_page_count) {
  43       page_number_ = 0;
  44     } else {
  45       page_number_ = -1;
  46     }
  47     page_range_index_ = -1;
  48   }
  49 }
  50
  51 int PageNumber::operator++() {
  52   if (!ranges_) {
  53     // Switch to next page.
  54     if (++page_number_ == document_page_count_) {
  55       // Finished.
  56       *this = npos();
  57     }
  58   } else {
  59     // Switch to next page.
  60     ++page_number_;
  61     // Page ranges are inclusive.
  62     if (page_number_ > (*ranges_)[page_range_index_].to) {
  63       DCHECK(ranges_->size() <= static_cast<size_t>(
  64           std::numeric_limits<int>::max()));
  65       if (++page_range_index_ == static_cast<int>(ranges_->size())) {
  66         // Finished.
  67         *this = npos();
  68       } else {
  69         page_number_ = (*ranges_)[page_range_index_].from;
  70       }
  71     }
  72   }
  73   return ToInt();
  74 }
  75
  76 bool PageNumber::operator==(const PageNumber& other) const {
  77   return page_number_ == other.page_number_ &&
  78          page_range_index_ == other.page_range_index_;
  79 }
  80 bool PageNumber::operator!=(const PageNumber& other) const {
  81   return page_number_ != other.page_number_ ||
  82          page_range_index_ != other.page_range_index_;
  83 }
  84
  85 }  // namespace printing