ff7ec676a7
This change moves primary ownership of a page's "layout rectangle" from individual PDFiumPage objects to the DocumentLayout as a whole. Conceptually, a page's rectangle in the layout really is a property of the layout, and not of the PDFium-specific page data structure: A PDFiumPage should be a client of the layout, not vice versa. This change also allows multiple layouts to exist simultaneously: The shared, per engine PDFiumPage-based layout rectangles currently prevent calculating different layouts independently. To minimize the size of this refactoring, for now the PDFiumPage retains a secondary copy of the layout rectangle for use during painting and coordinate transformations. This copy should only be updated when PDFiumEngine::ApplyCurrentLayoutToPages() is called, after a layout change. Bug: 885110 Change-Id: I8aac622e80f0779c556b8873ab085c6106f92c6e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1746084 Commit-Queue: K Moon <kmoon@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org> Cr-Commit-Position: refs/heads/master@{#686933}
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
// 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.
|
|
|
|
#ifndef PDF_DOCUMENT_LAYOUT_H_
|
|
#define PDF_DOCUMENT_LAYOUT_H_
|
|
|
|
#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 {
|
|
public:
|
|
// Options controlling layout behavior.
|
|
class Options final {
|
|
public:
|
|
Options();
|
|
|
|
Options(const Options& other);
|
|
Options& operator=(const Options& other);
|
|
|
|
~Options();
|
|
|
|
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();
|
|
|
|
private:
|
|
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();
|
|
|
|
DocumentLayout(const DocumentLayout& other) = delete;
|
|
DocumentLayout& operator=(const DocumentLayout& other) = delete;
|
|
|
|
~DocumentLayout();
|
|
|
|
// 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);
|
|
|
|
private:
|
|
Options options_;
|
|
|
|
// Layout's total size.
|
|
pp::Size size_;
|
|
|
|
// Page layout rectangles.
|
|
std::vector<pp::Rect> page_rects_;
|
|
};
|
|
|
|
} // namespace chrome_pdf
|
|
|
|
#endif // PDF_DOCUMENT_LAYOUT_H_
|