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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/document_layout.h"
#include <algorithm>
#include "base/check_op.h"
#include "base/notreached.h"
#include "base/values.h"
#include "pdf/draw_utils/coordinates.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace chrome_pdf {
namespace {
constexpr char kDirection[] = "direction";
constexpr char kDefaultPageOrientation[] = "defaultPageOrientation";
constexpr char kTwoUpViewEnabled[] = "twoUpViewEnabled";
int GetWidestPageWidth(const std::vector<gfx::Size>& page_sizes) {
int widest_page_width = 0;
for (const auto& page_size : page_sizes) {
widest_page_width = std::max(widest_page_width, page_size.width());
}
return widest_page_width;
}
} // namespace
DocumentLayout::Options::Options() = default;
DocumentLayout::Options::Options(const Options& other) = default;
DocumentLayout::Options& DocumentLayout::Options::operator=(
const Options& other) = default;
DocumentLayout::Options::~Options() = default;
base::Value::Dict DocumentLayout::Options::ToValue() const {
base::Value::Dict dictionary;
dictionary.Set(kDirection, direction_);
dictionary.Set(kDefaultPageOrientation,
static_cast<int>(default_page_orientation_));
dictionary.Set(kTwoUpViewEnabled, page_spread_ == PageSpread::kTwoUpOdd);
return dictionary;
}
void DocumentLayout::Options::FromValue(const base::Value::Dict& value) {
int32_t direction = value.FindInt(kDirection).value();
DCHECK_GE(direction, base::i18n::UNKNOWN_DIRECTION);
DCHECK_LE(direction, base::i18n::TEXT_DIRECTION_MAX);
direction_ = static_cast<base::i18n::TextDirection>(direction);
int32_t default_page_orientation =
value.FindInt(kDefaultPageOrientation).value();
DCHECK_GE(default_page_orientation,
static_cast<int32_t>(PageOrientation::kOriginal));
DCHECK_LE(default_page_orientation,
static_cast<int32_t>(PageOrientation::kLast));
default_page_orientation_ =
static_cast<PageOrientation>(default_page_orientation);
page_spread_ = value.FindBool(kTwoUpViewEnabled).value()
? PageSpread::kTwoUpOdd
: PageSpread::kOneUp;
}
void DocumentLayout::Options::RotatePagesClockwise() {
default_page_orientation_ = RotateClockwise(default_page_orientation_);
}
void DocumentLayout::Options::RotatePagesCounterclockwise() {
default_page_orientation_ = RotateCounterclockwise(default_page_orientation_);
}
DocumentLayout::DocumentLayout() = default;
DocumentLayout::~DocumentLayout() = default;
void DocumentLayout::SetOptions(const Options& options) {
// To be conservative, we want to consider the layout dirty for any layout
// option changes, even if the page rects don't necessarily change when
// layout options change.
//
// We also probably don't want layout changes to actually kick in until
// the next call to ComputeLayout(). (In practice, we'll call ComputeLayout()
// shortly after calling SetOptions().)
if (options_ != options) {
dirty_ = true;
}
options_ = options;
}
void DocumentLayout::ComputeLayout(const std::vector<gfx::Size>& page_sizes) {
switch (options_.page_spread()) {
case PageSpread::kOneUp:
return ComputeOneUpLayout(page_sizes);
case PageSpread::kTwoUpOdd:
return ComputeTwoUpOddLayout(page_sizes);
}
NOTREACHED();
}
void DocumentLayout::ComputeOneUpLayout(
const std::vector<gfx::Size>& page_sizes) {
gfx::Size document_size(GetWidestPageWidth(page_sizes), 0);
if (page_layouts_.size() != page_sizes.size()) {
// TODO(kmoon): May want to do less work when shrinking a layout.
page_layouts_.resize(page_sizes.size());
dirty_ = true;
}
for (size_t i = 0; i < page_sizes.size(); ++i) {
if (i != 0) {
// Add space for bottom separator.
document_size.Enlarge(0, kBottomSeparator);
}
const gfx::Size& page_size = page_sizes[i];
gfx::Rect page_rect =
draw_utils::GetRectForSingleView(page_size, document_size);
CopyRectIfModified(page_rect, page_layouts_[i].outer_rect);
page_rect.Inset(kSingleViewInsets);
CopyRectIfModified(page_rect, page_layouts_[i].inner_rect);
draw_utils::ExpandDocumentSize(page_size, &document_size);
}
if (size_ != document_size) {
size_ = document_size;
dirty_ = true;
}
}
void DocumentLayout::ComputeTwoUpOddLayout(
const std::vector<gfx::Size>& page_sizes) {
gfx::Size document_size(GetWidestPageWidth(page_sizes), 0);
if (page_layouts_.size() != page_sizes.size()) {
// TODO(kmoon): May want to do less work when shrinking a layout.
page_layouts_.resize(page_sizes.size());
dirty_ = true;
}
for (size_t i = 0; i < page_sizes.size(); ++i) {
gfx::Insets page_insets = draw_utils::GetPageInsetsForTwoUpView(
i, page_sizes.size(), kSingleViewInsets, kHorizontalSeparator);
const gfx::Size& page_size = page_sizes[i];
gfx::Rect page_rect;
if (i % 2 == 0) {
page_rect = draw_utils::GetLeftRectForTwoUpView(
page_size, {document_size.width(), document_size.height()});
} else {
page_rect = draw_utils::GetRightRectForTwoUpView(
page_size, {document_size.width(), document_size.height()});
document_size.Enlarge(
0, std::max(page_size.height(), page_sizes[i - 1].height()));
}
CopyRectIfModified(page_rect, page_layouts_[i].outer_rect);
page_rect.Inset(page_insets);
CopyRectIfModified(page_rect, page_layouts_[i].inner_rect);
}
if (page_sizes.size() % 2 == 1) {
document_size.Enlarge(0, page_sizes.back().height());
}
document_size.set_width(2 * document_size.width());
if (size_ != document_size) {
size_ = document_size;
dirty_ = true;
}
}
void DocumentLayout::CopyRectIfModified(const gfx::Rect& source_rect,
gfx::Rect& destination_rect) {
if (destination_rect != source_rect) {
destination_rect = source_rect;
dirty_ = true;
}
}
} // namespace chrome_pdf
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