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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 CHROME_BROWSER_UI_ASH_INPUT_METHOD_ANNOUNCEMENT_LABEL_H_
#define CHROME_BROWSER_UI_ASH_INPUT_METHOD_ANNOUNCEMENT_LABEL_H_
#include <memory>
#include <string>
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/views/controls/label.h"
namespace ui {
namespace ime {
// Label used for ChromeVox announcements via live regions.
class AnnouncementLabel : public views::Label {
METADATA_HEADER(AnnouncementLabel, views::Label)
public:
explicit AnnouncementLabel(const std::u16string& name);
~AnnouncementLabel() override;
// Make announcement to ChromeVox with the given text after a delay of N
// milliseconds specified by the param delay.
void AnnounceAfterDelay(const std::u16string& text, base::TimeDelta delay);
private:
// Callback used for delaying announcements
void DoAnnouncement(const std::u16string text);
void UpdateAccessibleDescription();
// Used to delay the ChromeVox announcements. A delay is required as
// announcements can "override" each other if they are triggered at
// a similar time. Providing a delay prevents our announcement being
// blocked by ChromeVox announcements triggered by text updates (i.e.
// pressing a key will trigger an announcement of the letter found
// on that key).
std::unique_ptr<base::OneShotTimer> delay_timer_;
std::u16string announcement_text_;
};
} // namespace ime
} // namespace ui
#endif // CHROME_BROWSER_UI_ASH_INPUT_METHOD_ANNOUNCEMENT_LABEL_H_
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