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/*
* Copyright (C) 2013, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_INLINE_TEXT_BOX_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_INLINE_TEXT_BOX_H_
#include <variant>
#include "base/notreached.h"
#include "third_party/blink/renderer/core/editing/markers/document_marker.h"
#include "third_party/blink/renderer/core/layout/inline/abstract_inline_text_box.h"
#include "third_party/blink/renderer/modules/accessibility/ax_block_flow_iterator.h"
#include "third_party/blink/renderer/modules/accessibility/ax_object.h"
namespace blink {
class AXObjectCacheImpl;
// Encapsulates an AbstractInlineTextBox and adapts it for use in Blink's
// accessibility tree.
class AXInlineTextBox final : public AXObject {
public:
AXInlineTextBox(AbstractInlineTextBox*, AXObjectCacheImpl&);
AXInlineTextBox(AXBlockFlowIterator::FragmentIndex, AXObjectCacheImpl&);
void Trace(Visitor* visitor) const override;
AXInlineTextBox(const AXInlineTextBox&) = delete;
AXInlineTextBox& operator=(const AXInlineTextBox&) = delete;
// AXObject overrides.
RGBA32 GetColor() const override { return Color::kTransparent.Rgb(); }
String GetName(ax::mojom::blink::NameFrom&,
AXObject::AXObjectVector* name_objects) const override;
void TextCharacterOffsets(Vector<int>&) const override;
void GetWordBoundaries(Vector<int>& word_starts,
Vector<int>& word_ends) const override;
int TextOffsetInFormattingContext(int offset) const override;
int TextOffsetInContainer(int offset) const override;
void GetRelativeBounds(AXObject** out_container,
gfx::RectF& out_bounds_in_container,
gfx::Transform& out_container_transform,
bool* clips_children = nullptr) const override;
ax::mojom::blink::WritingDirection GetTextDirection() const override;
Document* GetDocument() const override;
AXObject* NextOnLine() const override;
AXObject* PreviousOnLine() const override;
void SerializeMarkerAttributes(ui::AXNodeData* node_data) const override;
ax::mojom::blink::Role NativeRoleIgnoringAria() const override {
NOTREACHED();
}
void ClearChildren() override;
AbstractInlineTextBox* GetInlineTextBox() const override;
std::optional<AXBlockFlowIterator::FragmentIndex> GetFragmentIndex()
const override;
protected:
void Init(AXObject* parent) override;
void Detach() override;
bool IsAXInlineTextBox() const override;
bool IsLineBreakingObject() const override;
int TextLength() const override;
// Always a leaf.
bool CanHaveChildren() const override { return false; }
void AddChildren() override {}
private:
enum class Direction { kNext, kPrevious };
AXObject* NeighboringOnLine(const Direction direction) const;
// TODO(accessibility): rename this to the one above once we remove the AITB
// algorithm.
AXObject* NeighboringOnLineWithAXBlockFlowIterator(
const Direction direction) const;
// TODO(a11y): Remove default argument on virtual override.
// See https://google.github.io/styleguide/cppguide.html#Default_Arguments
bool ComputeIsIgnored(IgnoredReasons* = nullptr) const override;
bool IsPartOfAListItem() const;
// Holds one of two possible values that identify this AXInlineTextBox,
// depending on the algorithm being used.
std::variant<Member<AbstractInlineTextBox>,
AXBlockFlowIterator::FragmentIndex>
data_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_INLINE_TEXT_BOX_H_
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