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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PRINTING_PAGE_NUMBER_H_
#define PRINTING_PAGE_NUMBER_H_
#include <ostream>
#include <vector>
#include "base/check_op.h"
#include "base/memory/raw_ptr.h"
#include "printing/page_range.h"
namespace printing {
// Represents a page series using the array of page ranges. Pages are assumed
// to be 0-indexed.
class COMPONENT_EXPORT(PRINTING) PageNumber {
public:
// Initializes the page to the first page in the ranges or 0.
PageNumber(const PageRanges& ranges, uint32_t document_page_count);
PageNumber();
PageNumber(const PageNumber& other);
PageNumber& operator=(const PageNumber& other);
// Initializes the page to the first page in the ranges or 0.
// Initializes to npos if the ranges is empty and document_page_count is 0.
void Init(const PageRanges& ranges, uint32_t document_page_count);
// Converts to a page numbers.
uint32_t ToUint() const {
DCHECK(*this == npos() || page_number_ < document_page_count_);
return page_number_;
}
// Calculates the next page in the series. Sets this PageNumber to
// PageNumber::npos() if we reach document_page_count_.
uint32_t operator++();
// Returns an instance that represents the end of a series.
static const PageNumber npos() { return PageNumber(); }
// Equality operator. Only the current page number is verified so that
// "page != PageNumber::npos()" works.
bool operator==(const PageNumber& other) const;
bool operator!=(const PageNumber& other) const;
// Returns all pages represented by the given PageRanges up to and including
// page document_page_count - 1.
static std::vector<uint32_t> GetPages(PageRanges ranges,
uint32_t document_page_count);
private:
// The page range to follow.
raw_ptr<const PageRanges> ranges_;
// The next page to be printed. `kInvalidPageIndex` when not printing.
uint32_t page_number_;
// The next page to be printed. `kInvalidPageIndex` when not used. Valid only
// if document()->settings().range.empty() is false.
uint32_t page_range_index_;
// Total number of pages in the underlying document, including outside of the
// specified ranges.
uint32_t document_page_count_;
};
// Debug output support.
template <class E, class T>
inline typename std::basic_ostream<E, T>& operator<<(
typename std::basic_ostream<E, T>& ss,
const PageNumber& page) {
return ss << page.ToUint();
}
} // namespace printing
#endif // PRINTING_PAGE_NUMBER_H_
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