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