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// Copyright 2021 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_TREE_SOURCE_ANNOTATOR_H_
#define UI_ACCESSIBILITY_AX_TREE_SOURCE_ANNOTATOR_H_
#include <string>
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_tree_source.h"
#include "ui/accessibility/ax_tree_source_observer.h"
namespace ui {
// This is an interface for a class that could be used by any `AXTreeSource` to
// provide automatically generated accessible names, such as automatically
// generated alt text for unlabeled images. A specific annotator may be able to
// work on multiple `AXNodeSource`s, e.g. `AXNode*` and `WebAXObject`.
template <typename AXNodeSource>
class AX_EXPORT AXTreeSourceAnnotator
: public AXTreeSourceObserver<AXNodeSource> {
public:
virtual ~AXTreeSourceAnnotator() = default;
// Returns the automatically generated accessible name for the given
// `AXNodeSource`, if any. For example, in the case of an unlabeled image,
// this would return automatically generated alt text for the image.
virtual std::string GetAnnotation(
const AXTreeSource<AXNodeSource>& tree_source,
const AXNodeSource& node_source) const = 0;
// Returns a value indicating the status of the automatically generated
// accessible name, such as whether it is currently being computed, if it has
// been computed successfully, if the operation is still pending, etc.
//
// TODO(nektar): Rename `ImageAnnotationStatus` to `AnnotationStatus`.
virtual ax::mojom::ImageAnnotationStatus GetAnnotationStatus(
const AXTreeSource<AXNodeSource>& tree_source,
const AXNodeSource& node_source) const = 0;
// Returns true if an accessible name for the given `AXNodeSource` has already
// been automatically generated.
virtual bool HasAnnotationInCache(
const AXTreeSource<AXNodeSource>& tree_source,
const AXNodeSource& node_source) const = 0;
// Returns true if an accessible name for the given `AXNodeSource` has already
// been automatically generated, is in the process of being generated, or has
// encountered an error.
virtual bool HasNodeInCache(const AXTreeSource<AXNodeSource>& tree_source,
const AXNodeSource& node_source) const = 0;
// Returns true if the existing accessible name for a node consists of mostly
// stopwords, such as "the" and "of". This would be a strong indication that
// the accessible name is not informative and should be replaced by an
// automatically generated one.
virtual bool AccessibleNameHasMostlyStopwords(
const std::string& accessible_name) = 0;
};
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_TREE_SOURCE_ANNOTATOR_H_
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