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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCESSIBILITY_SCOPED_A11Y_OVERRIDE_WINDOW_SETTER_H_
#define ASH_ACCESSIBILITY_SCOPED_A11Y_OVERRIDE_WINDOW_SETTER_H_
#include "base/memory/raw_ptr.h"
#include "ui/aura/window_observer.h"
namespace aura {
class Window;
} // namespace aura
namespace ash {
// Scoped class that helps setting the window for accessibility focus for the
// duration of its own lifetime. Clears the accessibility focus window when
// destructed.
class ScopedA11yOverrideWindowSetter : public aura::WindowObserver {
public:
ScopedA11yOverrideWindowSetter() = default;
ScopedA11yOverrideWindowSetter(const ScopedA11yOverrideWindowSetter&) =
delete;
ScopedA11yOverrideWindowSetter& operator=(
const ScopedA11yOverrideWindowSetter&) = delete;
~ScopedA11yOverrideWindowSetter() override;
// aura::WindowObserver:
void OnWindowDestroying(aura::Window* window) override;
// Updates the a11y focus window if `current_a11y_override_window_` is not
// equal to `a11y_override_window`. This will make sure the accessibility
// features can always get the correct a11y override window to focus before
// getting the window with actual focus.
void MaybeUpdateA11yOverrideWindow(aura::Window* a11y_override_window);
private:
// Caches the value of the a11y override window. It will be updated when a
// different window should get focus from the accessibility features.
raw_ptr<aura::Window, DanglingUntriaged> current_a11y_override_window_ =
nullptr;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_SCOPED_A11Y_OVERRIDE_WINDOW_SETTER_H_
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