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// Copyright 2014 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.
#include <memory>
#include "ash/ash_export.h"
#include "ash/session/session_observer.h"
#include "ash/shell_observer.h"
#include "ash/voice_interaction/voice_interaction_observer.h"
#include "base/macros.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/views/controls/button/image_button.h"
namespace base {
class OneShotTimer;
} // namespace base
namespace ash {
class InkDropButtonListener;
class Shelf;
class ShelfView;
class AssistantOverlay;
// Button used for the AppList icon on the shelf.
class ASH_EXPORT AppListButton : public views::ImageButton,
public ShellObserver,
public SessionObserver,
public VoiceInteractionObserver {
AppListButton(InkDropButtonListener* listener,
ShelfView* shelf_view,
Shelf* shelf);
~AppListButton() override;
void OnAppListShown();
void OnAppListDismissed();
bool is_showing_app_list() const { return is_showing_app_list_; }
// Updates background and schedules a paint.
void UpdateShelfItemBackground(SkColor color);
// views::ImageButton:
void OnGestureEvent(ui::GestureEvent* event) override;
// Get the center point of the app list button circle used to draw its
// background and ink drops.
gfx::Point GetAppListButtonCenterPoint() const;
// Get the center point of the app list button back arrow. Returns an empty
// gfx::Point if the back arrow is not shown.
gfx::Point GetBackButtonCenterPoint() const;
// Called by ShelfView to notify the app list button that it has started or
// finished a bounds animation.
void OnBoundsAnimationStarted();
void OnBoundsAnimationFinished();
// views::ImageButton:
bool OnMousePressed(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnMouseCaptureLost() override;
bool OnMouseDragged(const ui::MouseEvent& event) override;
void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
void NotifyClick(const ui::Event& event) override;
bool ShouldEnterPushedState(const ui::Event& event) override;
std::unique_ptr<views::InkDrop> CreateInkDrop() override;
std::unique_ptr<views::InkDropMask> CreateInkDropMask() const override;
void PaintButtonContents(gfx::Canvas* canvas) override;
// ShellObserver:
void OnAppListVisibilityChanged(bool shown,
aura::Window* root_window) override;
// VoiceInteractionObserver:
void OnVoiceInteractionStatusChanged(
mojom::VoiceInteractionState state) override;
void OnVoiceInteractionSettingsEnabled(bool enabled) override;
void OnVoiceInteractionSetupCompleted(bool completed) override;
// SessionObserver:
void OnActiveUserSessionChanged(const AccountId& account_id) override;
void StartVoiceInteractionAnimation();
// Helper function to determine whether and event at |location| should be
// handled by the back button or the app list circle. Returns false if we are
// not in tablet mode (there is no back button).
bool IsBackEvent(const gfx::Point& location);
// Generate and send a VKEY_BROWSER_BACK key event when the back button
// portion is clicked or tapped.
void GenerateAndSendBackEvent(const ui::LocatedEvent& original_event);
// Whether the voice interaction style should be used.
bool UseVoiceInteractionStyle();
// Initialize the voice interaction overlay.
void InitializeVoiceInteractionOverlay();
// True if the app list is currently showing for this display.
// This is useful because other IsApplistVisible functions aren't per-display.
bool is_showing_app_list_;
// Color used to paint the background.
SkColor background_color_;
InkDropButtonListener* listener_;
ShelfView* shelf_view_;
Shelf* shelf_;
// Owned by the view hierarchy. Null if the voice interaction is not enabled.
AssistantOverlay* assistant_overlay_ = nullptr;
std::unique_ptr<base::OneShotTimer> assistant_animation_delay_timer_;
std::unique_ptr<base::OneShotTimer> assistant_animation_hide_delay_timer_;
base::TimeTicks voice_interaction_start_timestamp_;
// Flag that gets set each time we receive a mouse or gesture event. It is
// then used to render the ink drop in the right location.
bool last_event_is_back_event_ = false;
} // namespace ash