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- // Copyright 2016 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 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();
- virtual ~AXRelativeBounds();
- AXRelativeBounds(const AXRelativeBounds& other);
- AXRelativeBounds& operator=(AXRelativeBounds other);
- bool operator!=(const AXRelativeBounds& other) const;
- 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` 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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