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// Copyright 2018 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_ASSISTANT_MODEL_ASSISTANT_UI_MODEL_OBSERVER_H_
#define ASH_ASSISTANT_MODEL_ASSISTANT_UI_MODEL_OBSERVER_H_
#include <optional>
#include "base/component_export.h"
#include "base/observer_list_types.h"
#include "ui/gfx/geometry/rect.h"
namespace ash {
namespace assistant {
enum class AssistantEntryPoint;
enum class AssistantExitPoint;
} // namespace assistant
enum class AssistantVisibility;
// A checked observer which receives notification of changes to the Assistant UI
// model.
class COMPONENT_EXPORT(ASSISTANT_MODEL) AssistantUiModelObserver
: public base::CheckedObserver {
public:
using AssistantEntryPoint = assistant::AssistantEntryPoint;
using AssistantExitPoint = assistant::AssistantExitPoint;
AssistantUiModelObserver(const AssistantUiModelObserver&) = delete;
AssistantUiModelObserver& operator=(const AssistantUiModelObserver&) = delete;
// Invoked when keyboard traversal mode is changed (enabled/disabled).
virtual void OnKeyboardTraversalModeChanged(bool keyboard_traversal_mode) {}
// Invoked when the UI visibility is changed from |old_visibility| to
// |new_visibility|. The |source| of the visibility change event is provided
// for interested observers.
virtual void OnUiVisibilityChanged(
AssistantVisibility new_visibility,
AssistantVisibility old_visibility,
std::optional<AssistantEntryPoint> entry_point,
std::optional<AssistantExitPoint> exit_point) {}
// Invoked when the usable display work area is changed. Observers should
// respond to this event by ensuring they are sized/positioned within the
// |usable_work_area|.
virtual void OnUsableWorkAreaChanged(const gfx::Rect& usable_work_area) {}
protected:
AssistantUiModelObserver() = default;
~AssistantUiModelObserver() override = default;
};
} // namespace ash
#endif // ASH_ASSISTANT_MODEL_ASSISTANT_UI_MODEL_OBSERVER_H_
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