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// Copyright 2018 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_VIEWS_ACCESSIBILITY_ACCESSIBILITY_ALERT_WINDOW_H_
#define UI_VIEWS_ACCESSIBILITY_ACCESSIBILITY_ALERT_WINDOW_H_
#include <memory>
#include <string>
#include "base/gtest_prod_util.h"
#include "base/scoped_observation.h"
#include "ui/aura/env.h"
#include "ui/aura/env_observer.h"
#include "ui/views/views_export.h"
namespace aura {
class Window;
}
namespace views {
class AXAuraObjCache;
// This class provides a caller a way to alert an accessibility client such as
// ChromeVox with a text string without a backing visible window or view.
class VIEWS_EXPORT AccessibilityAlertWindow : public aura::EnvObserver {
public:
// |parent| is the window where a child alert window will be added.
AccessibilityAlertWindow(aura::Window* parent, views::AXAuraObjCache* cache);
AccessibilityAlertWindow(const AccessibilityAlertWindow&) = delete;
AccessibilityAlertWindow& operator=(const AccessibilityAlertWindow&) = delete;
~AccessibilityAlertWindow() override;
// Triggers an alert with the text |alert_string| to be sent to an
// accessibility client.
void HandleAlert(const std::string& alert_string);
private:
FRIEND_TEST_ALL_PREFIXES(AccessibilityAlertWindowTest, HandleAlert);
FRIEND_TEST_ALL_PREFIXES(AccessibilityAlertWindowTest, OnWillDestroyEnv);
// aura::EnvObserver:
void OnWillDestroyEnv() override;
// The child alert window.
std::unique_ptr<aura::Window> alert_window_;
// The accessibility cache associated with |alert_window_|.
views::AXAuraObjCache* cache_;
base::ScopedObservation<aura::Env, aura::EnvObserver> observation_{this};
};
} // namespace views
#endif // UI_VIEWS_ACCESSIBILITY_ACCESSIBILITY_ALERT_WINDOW_H_
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