printing/page_number.h

   1 // Copyright (c) 2011 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 #ifndef PRINTING_PAGE_NUMBER_H_
   6 #define PRINTING_PAGE_NUMBER_H_
   7
   8 #include <ostream>
   9
  10 #include "printing/page_range.h"
  11
  12 namespace printing {
  13
  14 class PrintSettings;
  15
  16 // Represents a page series following the array of page ranges defined in a
  17 // PrintSettings.
  18 class PRINTING_EXPORT PageNumber {
  19  public:
  20   // Initializes the page to the first page in the settings's range or 0.
  21   PageNumber(const PrintSettings& settings, int document_page_count);
  22
  23   PageNumber();
  24
  25   void operator=(const PageNumber& other);
  26
  27   // Initializes the page to the first page in the setting's range or 0. It
  28   // initialize to npos if the range is empty and document_page_count is 0.
  29   void Init(const PrintSettings& settings, int document_page_count);
  30
  31   // Converts to a page numbers.
  32   int ToInt() const {
  33     return page_number_;
  34   }
  35
  36   // Calculates the next page in the serie.
  37   int operator++();
  38
  39   // Returns an instance that represents the end of a serie.
  40   static const PageNumber npos() {
  41     return PageNumber();
  42   }
  43
  44   // Equality operator. Only the current page number is verified so that
  45   // "page != PageNumber::npos()" works.
  46   bool operator==(const PageNumber& other) const;
  47   bool operator!=(const PageNumber& other) const;
  48
  49  private:
  50   // The page range to follow.
  51   const PageRanges* ranges_;
  52
  53   // The next page to be printed. -1 when not printing.
  54   int page_number_;
  55
  56   // The next page to be printed. -1 when not used. Valid only if
  57   // document()->settings().range.empty() is false.
  58   int page_range_index_;
  59
  60   // Number of expected pages in the document. Used when ranges_ is NULL.
  61   int document_page_count_;
  62 };
  63
  64 // Debug output support.
  65 template<class E, class T>
  66 inline typename std::basic_ostream<E,T>& operator<<(
  67     typename std::basic_ostream<E,T>& ss, const PageNumber& page) {
  68   return ss << page.ToInt();
  69 }
  70
  71 }  // namespace printing
  72
  73 #endif  // PRINTING_PAGE_NUMBER_H_