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// Copyright 2019 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_HOME_BUTTON_CONTROLLER_H_
#define ASH_SHELF_HOME_BUTTON_CONTROLLER_H_
#include <memory>
#include "ash/assistant/model/assistant_ui_model_observer.h"
#include "ash/capture_mode/sunfish_scanner_feature_watcher.h"
#include "ash/public/cpp/app_list/app_list_controller_observer.h"
#include "ash/public/cpp/assistant/assistant_state.h"
#include "base/memory/raw_ptr.h"
#include "base/scoped_observation.h"
#include "ui/display/display_observer.h"
namespace display {
enum class TabletState;
} // namespace display
namespace ui {
class GestureEvent;
} // namespace ui
namespace ash {
class HomeButtonTapOverlay;
class HomeButton;
// Controls behavior of the HomeButton, including a possible long-press
// action (for Assistant).
// Behavior is tested indirectly in HomeButtonTest and ShelfViewInkDropTest.
class HomeButtonController : public AppListControllerObserver,
public display::DisplayObserver,
public AssistantStateObserver,
public AssistantUiModelObserver,
public SunfishScannerFeatureWatcher::Observer {
public:
explicit HomeButtonController(HomeButton* button);
HomeButtonController(const HomeButtonController&) = delete;
HomeButtonController& operator=(const HomeButtonController&) = delete;
~HomeButtonController() override;
// Maybe handles a gesture event based on the event and whether the Assistant
// is available. Returns true if the event is consumed; otherwise, HomeButton
// should pass the event along to Button to consume.
bool MaybeHandleGestureEvent(ui::GestureEvent* event);
// Whether long-pressing the home button will perform an action, such as
// opening the Assistant UI or opening a Sunfish-behavior capture session.
bool IsLongPressActionAvailable();
// Whether the Assistant UI currently showing.
bool IsAssistantVisible();
private:
// Whether the Assistant is available via long-press.
bool IsAssistantAvailable();
// Whether Sunfish or Scanner's UI can be shown.
bool IsSunfishOrScannerAvailable() const;
// AppListControllerObserver:
void OnAppListVisibilityWillChange(bool shown, int64_t display_id) override;
// display::DisplayObserver:
void OnDisplayTabletStateChanged(display::TabletState state) override;
// AssistantStateObserver:
void OnAssistantFeatureAllowedChanged(
assistant::AssistantAllowedState) override;
void OnAssistantSettingsEnabled(bool enabled) override;
// AssistantUiModelObserver:
void OnUiVisibilityChanged(
AssistantVisibility new_visibility,
AssistantVisibility old_visibility,
std::optional<AssistantEntryPoint> entry_point,
std::optional<AssistantExitPoint> exit_point) override;
// SunfishScannerFeatureWatcher::Observer:
void OnSunfishScannerFeatureStatesChanged(
SunfishScannerFeatureWatcher& source) override;
void OnAppListShown();
void OnAppListDismissed();
void StartAssistantAnimation();
// Initialize the Assistant overlay.
void InitializeAssistantOverlay();
// The button that owns this controller.
const raw_ptr<HomeButton> button_;
// Owned by the button's view hierarchy.
raw_ptr<HomeButtonTapOverlay> tap_overlay_ = nullptr;
std::unique_ptr<base::OneShotTimer> tap_animation_delay_timer_;
// Observes changes in Sunfish and Scanner feature states.
base::ScopedObservation<SunfishScannerFeatureWatcher,
SunfishScannerFeatureWatcher::Observer>
sunfish_scanner_feature_observation_{this};
display::ScopedDisplayObserver display_observer_{this};
};
} // namespace ash
#endif // ASH_SHELF_HOME_BUTTON_CONTROLLER_H_
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