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// 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 ASH_SHELF_BACK_BUTTON_H_
#define ASH_SHELF_BACK_BUTTON_H_
#include <memory>
#include "ash/ash_export.h"
#include "ash/shelf/shelf_button_delegate.h"
#include "ash/shelf/shelf_control_button.h"
#include "ui/accessibility/ax_enums.mojom-forward.h"
#include "ui/base/metadata/metadata_header_macros.h"
namespace ash {
class ShelfButtonDelegate;
// The back button shown on the shelf when tablet mode is enabled. Its opacity
// and visiblity are handled by its parent, ShelfView, to ensure the fade
// in/out of the icon matches the movement of ShelfView's items.
class ASH_EXPORT BackButton : public ShelfControlButton,
public ShelfButtonDelegate {
METADATA_HEADER(BackButton, ShelfControlButton)
public:
explicit BackButton(Shelf* shelf);
BackButton(const BackButton&) = delete;
BackButton& operator=(const BackButton&) = delete;
~BackButton() override;
// Called when a locale change is detected. Updates the button tooltip and
// accessible name.
void HandleLocaleChange();
// views::Button:
void PaintButtonContents(gfx::Canvas* canvas) override;
// views::View:
void OnThemeChanged() override;
// ShelfButtonDelegate:
void OnShelfButtonAboutToRequestFocusFromTabTraversal(ShelfButton* button,
bool reverse) override;
void ButtonPressed(views::Button* sender,
const ui::Event& event,
views::InkDrop* ink_drop) override;
private:
void OnAXNameChanged(ax::mojom::StringAttribute attribute,
const std::optional<std::string>& name);
base::CallbackListSubscription ax_name_change_subscription_;
};
} // namespace ash
#endif // ASH_SHELF_BACK_BUTTON_H_
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