blob: 2e95c5908a656f229aa5253c7cb8653058e31470 [file] [log] [blame]
// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstddef>
#include <vector>
#include "base/logging.h"
#include "pdf/draw_utils/coordinates.h"
#include "pdf/page_orientation.h"
#include "ppapi/cpp/rect.h"
#include "ppapi/cpp/size.h"
namespace chrome_pdf {
// Layout of pages within a PDF document. Pages are placed as rectangles
// (possibly rotated) in a non-overlapping vertical sequence.
// All layout units are pixels.
// The |Options| class controls the behavior of the layout, such as the default
// orientation of pages.
class DocumentLayout final {
// Options controlling layout behavior.
class Options final {
Options(const Options& other);
Options& operator=(const Options& other);
PageOrientation default_page_orientation() const {
return default_page_orientation_;
// Rotates default page orientation 90 degrees clockwise.
void RotatePagesClockwise();
// Rotates default page orientation 90 degrees counterclockwise.
void RotatePagesCounterclockwise();
PageOrientation default_page_orientation_ = PageOrientation::kOriginal;
static const draw_utils::PageInsetSizes kSingleViewInsets;
static constexpr int32_t kBottomSeparator = 4;
static constexpr int32_t kHorizontalSeparator = 1;
DocumentLayout(const DocumentLayout& other) = delete;
DocumentLayout& operator=(const DocumentLayout& other) = delete;
// Returns the layout options.
const Options& options() const { return options_; }
// Sets the layout options.
void set_options(const Options& options) { options_ = options; }
// Returns the layout's total size.
const pp::Size& size() const { return size_; }
// Sets the layout's total size.
// TODO(kmoon): Get rid of this method.
void set_size(const pp::Size& size) { size_ = size; }
size_t page_count() const { return page_rects_.size(); }
// Gets the layout rectangle for a page. Only valid after computing a layout.
const pp::Rect& page_rect(size_t page_index) const {
DCHECK_LT(page_index, page_count());
return page_rects_[page_index];
// Computes layout that represent |page_sizes| formatted for single view.
// TODO(kmoon): Control layout type using an option.
void ComputeSingleViewLayout(const std::vector<pp::Size>& page_sizes);
// Computes layout that represent |page_sizes| formatted for two-up view.
// TODO(kmoon): Control layout type using an option.
void ComputeTwoUpViewLayout(const std::vector<pp::Size>& page_sizes);
// Increases the layout's total height by |height|.
// TODO(kmoon): Delete or make this private.
void EnlargeHeight(int height);
Options options_;
// Layout's total size.
pp::Size size_;
// Page layout rectangles.
std::vector<pp::Rect> page_rects_;
} // namespace chrome_pdf