chromium/ui/accessibility/ax_event_generator.h

// Copyright 2017 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_EVENT_GENERATOR_H_
#define UI_ACCESSIBILITY_AX_EVENT_GENERATOR_H_

#include <bitset>
#include <map>
#include <memory>
#include <ostream>
#include <set>
#include <string>
#include <vector>

#include "base/memory/raw_ptr.h"
#include "base/memory/raw_ref.h"
#include "base/scoped_observation.h"
#include "ui/accessibility/ax_event_intent.h"
#include "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_tree.h"
#include "ui/accessibility/ax_tree_observer.h"

namespace ui {

// Subclass of AXTreeObserver that automatically generates AXEvents to fire
// based on changes to an accessibility tree.  Every platform
// tends to want different events, so this class lets each platform
// handle the events it wants and ignore the others.
class AX_EXPORT AXEventGenerator : public AXTreeObserver { … };

AX_EXPORT std::ostream& operator<<(std::ostream& os,
                                   AXEventGenerator::Event event);
AX_EXPORT const char* ToString(AXEventGenerator::Event event);

// Parses the attribute and updates |result| and returns true if a match is
// found, or returns false if no match is found.
AX_EXPORT bool MaybeParseGeneratedEvent(const char* attribute,
                                        AXEventGenerator::Event* result);

// Does a NOTREACHED if no match is found.
AX_EXPORT AXEventGenerator::Event ParseGeneratedEvent(const char* attribute);

}  // namespace ui

#endif  // UI_ACCESSIBILITY_AX_EVENT_GENERATOR_H_