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// Copyright 2018 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 "third_party/blink/renderer/core/layout/ng/inline/ng_abstract_inline_text_box.h"
#include "third_party/blink/renderer/core/accessibility/ax_object_cache.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_text_fragment.h"
#include "third_party/blink/renderer/core/paint/ng/ng_paint_fragment.h"
#include "third_party/blink/renderer/core/paint/ng/ng_paint_fragment_traversal.h"
#include "third_party/blink/renderer/platform/fonts/character_range.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_buffer.h"
namespace blink {
NGAbstractInlineTextBox::FragmentToNGAbstractInlineTextBoxHashMap*
NGAbstractInlineTextBox::g_abstract_inline_text_box_map_ = nullptr;
scoped_refptr<AbstractInlineTextBox> NGAbstractInlineTextBox::GetOrCreate(
LineLayoutText line_layout_item,
const NGPaintFragment& fragment) {
DCHECK(fragment.GetLayoutObject()->IsText()) << fragment.GetLayoutObject();
if (!g_abstract_inline_text_box_map_) {
g_abstract_inline_text_box_map_ =
new FragmentToNGAbstractInlineTextBoxHashMap();
}
const auto it = g_abstract_inline_text_box_map_->find(&fragment);
if (it != g_abstract_inline_text_box_map_->end())
return it->value;
scoped_refptr<AbstractInlineTextBox> obj =
base::AdoptRef(new NGAbstractInlineTextBox(line_layout_item, fragment));
g_abstract_inline_text_box_map_->Set(&fragment, obj);
return obj;
}
void NGAbstractInlineTextBox::WillDestroy(NGPaintFragment* fragment) {
if (!g_abstract_inline_text_box_map_)
return;
const auto it = g_abstract_inline_text_box_map_->find(fragment);
if (it != g_abstract_inline_text_box_map_->end()) {
it->value->Detach();
g_abstract_inline_text_box_map_->erase(fragment);
}
}
NGAbstractInlineTextBox::NGAbstractInlineTextBox(
LineLayoutText line_layout_item,
const NGPaintFragment& fragment)
: AbstractInlineTextBox(line_layout_item), fragment_(&fragment) {
DCHECK(fragment_->PhysicalFragment().IsText()) << fragment_;
}
NGAbstractInlineTextBox::~NGAbstractInlineTextBox() {
DCHECK(!fragment_);
}
void NGAbstractInlineTextBox::Detach() {
if (Node* const node = GetNode()) {
if (AXObjectCache* cache = node->GetDocument().ExistingAXObjectCache())
cache->InlineTextBoxesUpdated(GetLineLayoutItem());
}
AbstractInlineTextBox::Detach();
fragment_ = nullptr;
}
bool NGAbstractInlineTextBox::HasSoftWrapToNextLine() const {
return ToNGPhysicalLineBoxFragment(
fragment_->ContainerLineBox()->PhysicalFragment())
.HasSoftWrapToNextLine();
}
const NGPhysicalTextFragment& NGAbstractInlineTextBox::PhysicalTextFragment()
const {
return ToNGPhysicalTextFragment(fragment_->PhysicalFragment());
}
bool NGAbstractInlineTextBox::NeedsLayout() const {
return fragment_->GetLayoutObject()->NeedsLayout();
}
bool NGAbstractInlineTextBox::NeedsTrailingSpace() const {
if (!HasSoftWrapToNextLine())
return false;
const NGPaintFragment* next_fragment = NextTextFragmentForSameLayoutObject();
if (!next_fragment)
return false;
return ToNGPhysicalTextFragment(next_fragment->PhysicalFragment())
.StartOffset() != PhysicalTextFragment().EndOffset();
}
const NGPaintFragment*
NGAbstractInlineTextBox::NextTextFragmentForSameLayoutObject() const {
const auto fragments =
NGPaintFragment::InlineFragmentsFor(fragment_->GetLayoutObject());
const auto it =
std::find_if(fragments.begin(), fragments.end(),
[&](const auto& sibling) { return fragment_ == sibling; });
DCHECK(it != fragments.end());
const auto next_it = std::next(it);
return next_it == fragments.end() ? nullptr : *next_it;
}
scoped_refptr<AbstractInlineTextBox>
NGAbstractInlineTextBox::NextInlineTextBox() const {
if (!fragment_)
return nullptr;
DCHECK(!NeedsLayout());
const NGPaintFragment* next_fragment = NextTextFragmentForSameLayoutObject();
if (!next_fragment)
return nullptr;
return GetOrCreate(GetLineLayoutItem(), *next_fragment);
}
LayoutRect NGAbstractInlineTextBox::LocalBounds() const {
if (!fragment_ || !GetLineLayoutItem())
return LayoutRect();
return LayoutRect(fragment_->InlineOffsetToContainerBox().ToLayoutPoint(),
fragment_->Size().ToLayoutSize());
}
unsigned NGAbstractInlineTextBox::Len() const {
if (!fragment_)
return 0;
if (NeedsTrailingSpace())
return PhysicalTextFragment().Length() + 1;
return PhysicalTextFragment().Length();
}
AbstractInlineTextBox::Direction NGAbstractInlineTextBox::GetDirection() const {
if (!fragment_ || !GetLineLayoutItem())
return kLeftToRight;
const TextDirection text_direction =
PhysicalTextFragment().ResolvedDirection();
if (GetLineLayoutItem().Style()->IsHorizontalWritingMode())
return IsLtr(text_direction) ? kLeftToRight : kRightToLeft;
return IsLtr(text_direction) ? kTopToBottom : kBottomToTop;
}
void NGAbstractInlineTextBox::CharacterWidths(Vector<float>& widths) const {
if (!fragment_)
return;
if (!PhysicalTextFragment().TextShapeResult()) {
// When |fragment_| for BR, we don't have shape result.
// "aom-computed-boolean-properties.html" reaches here.
widths.resize(Len());
return;
}
const ShapeResult& shape_result = *PhysicalTextFragment().TextShapeResult();
Vector<CharacterRange> ranges;
shape_result.IndividualCharacterRanges(&ranges);
widths.ReserveCapacity(ranges.size());
widths.resize(0);
for (const auto& range : ranges)
widths.push_back(range.Width());
// The shaper can fail to return glyph metrics for all characters (see
// crbug.com/613915 and crbug.com/615661) so add empty ranges to ensure all
// characters have an associated range.
widths.resize(Len());
}
String NGAbstractInlineTextBox::GetText() const {
if (!fragment_ || !GetLineLayoutItem())
return String();
// For compatibility with |InlineTextBox|, we should have a space character
// for soft line break.
// Following tests require this:
// - accessibility/inline-text-change-style.html
// - accessibility/inline-text-changes.html
// - accessibility/inline-text-word-boundaries.html
if (NeedsTrailingSpace())
return PhysicalTextFragment().Text().ToString() + " ";
return PhysicalTextFragment().Text().ToString();
}
bool NGAbstractInlineTextBox::IsFirst() const {
if (!fragment_)
return true;
DCHECK(!NeedsLayout());
const auto fragments =
NGPaintFragment::InlineFragmentsFor(fragment_->GetLayoutObject());
return fragment_ == &fragments.front();
}
bool NGAbstractInlineTextBox::IsLast() const {
if (!fragment_)
return true;
DCHECK(!NeedsLayout());
const auto fragments =
NGPaintFragment::InlineFragmentsFor(fragment_->GetLayoutObject());
return fragment_ == &fragments.back();
}
scoped_refptr<AbstractInlineTextBox> NGAbstractInlineTextBox::NextOnLine()
const {
if (!fragment_)
return nullptr;
DCHECK(!NeedsLayout());
DCHECK(fragment_->ContainerLineBox());
NGPaintFragmentTraversal cursor(*fragment_->ContainerLineBox(), *fragment_);
for (cursor.MoveToNext(); !cursor.IsAtEnd(); cursor.MoveToNext()) {
if (cursor->GetLayoutObject()->IsText())
return GetOrCreate(GetLineLayoutItem(), *cursor);
}
return nullptr;
}
scoped_refptr<AbstractInlineTextBox> NGAbstractInlineTextBox::PreviousOnLine()
const {
if (!fragment_)
return nullptr;
DCHECK(!NeedsLayout());
DCHECK(fragment_->ContainerLineBox());
NGPaintFragmentTraversal cursor(*fragment_->ContainerLineBox(), *fragment_);
for (cursor.MoveToPrevious(); !cursor.IsAtEnd(); cursor.MoveToPrevious()) {
if (cursor->GetLayoutObject()->IsText())
return GetOrCreate(GetLineLayoutItem(), *cursor);
}
return nullptr;
}
} // namespace blink
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