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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_ACCESSIBILITY_AX_RELATIVE_BOUNDS_H_
#define UI_ACCESSIBILITY_AX_RELATIVE_BOUNDS_H_
#include <stdint.h>
#include <iosfwd>
#include <memory>
#include "ui/accessibility/ax_base_export.h"
#include "ui/accessibility/ax_enums.mojom-forward.h"
#include "ui/accessibility/ax_node_id_forward.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/transform.h"
namespace ui {
// The relative bounding box of an AXNode.
//
// This is an efficient, compact, serializable representation of a node's
// bounding box that requires minimal changes to the tree when layers are
// moved or scrolled. Computing the absolute bounding box of a node requires
// walking up the tree and applying node offsets and transforms until reaching
// the top.
//
// If the offset container id is valid, the bounds are relative
// to the node with that offset container id.
//
// Otherwise, for a node other than the root, the bounds are relative to
// the root of the tree, and for the root of a tree, the bounds are relative
// to its immediate containing node.
struct AX_BASE_EXPORT AXRelativeBounds final {
AXRelativeBounds();
~AXRelativeBounds();
AXRelativeBounds(const AXRelativeBounds& other);
AXRelativeBounds(AXRelativeBounds&& other) noexcept;
AXRelativeBounds& operator=(const AXRelativeBounds& other);
AXRelativeBounds& operator=(AXRelativeBounds&& other) noexcept = default;
bool operator==(const AXRelativeBounds& other) const;
std::string ToString() const;
// The id of an ancestor node in the same AXTree that this object's bounding
// box is relative to, or kInvalidAXNodeID (0) if there's no offset container.
AXNodeID offset_container_id = kInvalidAXNodeID;
// The relative bounding box of this node.
gfx::RectF bounds;
// An additional transform to apply to position this object and its subtree.
// NOTE: this member is a std::unique_ptr because it's rare and gfx::Transform
// takes up a fair amount of space. The assignment operator and copy
// constructor both make a duplicate of the owned pointer, so it acts more
// like a member than a pointer.
std::unique_ptr<gfx::Transform> transform;
};
AX_BASE_EXPORT std::ostream& operator<<(std::ostream& stream,
const AXRelativeBounds& bounds);
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_RELATIVE_BOUNDS_H_
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