packages/CarSystemUI/src/com/android/systemui/statusbar/car/CarStatusBar.java

/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.statusbar.car;

import android.app.ActivityManager;
import android.app.ActivityTaskManager;
import android.car.drivingstate.CarDrivingStateEvent;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.android.car.notification.CarNotificationListener;
import com.android.car.notification.CarNotificationView;
import com.android.car.notification.CarUxRestrictionManagerWrapper;
import com.android.car.notification.NotificationClickHandlerFactory;
import com.android.car.notification.NotificationViewController;
import com.android.car.notification.PreprocessingManager;
import com.android.keyguard.KeyguardUpdateMonitor;
import com.android.systemui.BatteryMeterView;
import com.android.systemui.CarSystemUIFactory;
import com.android.systemui.Dependency;
import com.android.systemui.Prefs;
import com.android.systemui.R;
import com.android.systemui.SystemUIFactory;
import com.android.systemui.classifier.FalsingLog;
import com.android.systemui.classifier.FalsingManager;
import com.android.systemui.fragments.FragmentHostManager;
import com.android.systemui.plugins.qs.QS;
import com.android.systemui.qs.car.CarQSFragment;
import com.android.systemui.shared.system.ActivityManagerWrapper;
import com.android.systemui.shared.system.TaskStackChangeListener;
import com.android.systemui.statusbar.StatusBarState;
import com.android.systemui.statusbar.car.hvac.HvacController;
import com.android.systemui.statusbar.car.hvac.TemperatureView;
import com.android.systemui.statusbar.phone.CollapsedStatusBarFragment;
import com.android.systemui.statusbar.phone.StatusBar;
import com.android.systemui.statusbar.policy.BatteryController;
import com.android.systemui.statusbar.policy.DeviceProvisionedController;
import com.android.systemui.statusbar.policy.UserSwitcherController;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.Map;

/**
 * A status bar (and navigation bar) tailored for the automotive use case.
 */
public class CarStatusBar extends StatusBar implements
        CarBatteryController.BatteryViewHandler {
    private static final String TAG = "CarStatusBar";

    private TaskStackListenerImpl mTaskStackListener;

    private FullscreenUserSwitcher mFullscreenUserSwitcher;

    private CarBatteryController mCarBatteryController;
    private BatteryMeterView mBatteryMeterView;
    private Drawable mNotificationPanelBackground;

    private ViewGroup mNavigationBarWindow;
    private ViewGroup mLeftNavigationBarWindow;
    private ViewGroup mRightNavigationBarWindow;
    private CarNavigationBarView mNavigationBarView;
    private CarNavigationBarView mLeftNavigationBarView;
    private CarNavigationBarView mRightNavigationBarView;

    private final Object mQueueLock = new Object();
    private boolean mShowLeft;
    private boolean mShowRight;
    private boolean mShowBottom;
    private CarFacetButtonController mCarFacetButtonController;
    private ActivityManagerWrapper mActivityManagerWrapper;
    private DeviceProvisionedController mDeviceProvisionedController;
    private boolean mDeviceIsProvisioned = true;
    private HvacController mHvacController;
    private DrivingStateHelper mDrivingStateHelper;
    private SwitchToGuestTimer mSwitchToGuestTimer;

    // The container for the notifications.
    private CarNotificationView mNotificationView;
    private RecyclerView mNotificationList;
    // The state of if the notification list is currently showing the bottom.
    private boolean mNotificationListAtBottom;
    // Was the notification list at the bottom when the user first touched the screen
    private boolean mNotificationListAtBottomAtTimeOfTouch;
    // To be attached to the navigation bars such that they can close the notification panel if
    // it's open.
    private View.OnTouchListener mNavBarNotificationTouchListener;

    @Override
    public void start() {
        // get the provisioned state before calling the parent class since it's that flow that
        // builds the nav bar
        mDeviceProvisionedController = Dependency.get(DeviceProvisionedController.class);
        mDeviceIsProvisioned = mDeviceProvisionedController.isDeviceProvisioned();
        super.start();
        mTaskStackListener = new TaskStackListenerImpl();
        mActivityManagerWrapper = ActivityManagerWrapper.getInstance();
        mActivityManagerWrapper.registerTaskStackListener(mTaskStackListener);

        mNotificationPanel.setScrollingEnabled(true);

        createBatteryController();
        mCarBatteryController.startListening();

        mHvacController.connectToCarService();

        CarSystemUIFactory factory = SystemUIFactory.getInstance();
        if (!mDeviceIsProvisioned) {
            mDeviceProvisionedController.addCallback(
                    new DeviceProvisionedController.DeviceProvisionedListener() {
                        @Override
                        public void onDeviceProvisionedChanged() {
                            mHandler.post(() -> {
                                // on initial boot we are getting a call even though the value
                                // is the same so we are confirming the reset is needed
                                boolean deviceProvisioned =
                                        mDeviceProvisionedController.isDeviceProvisioned();
                                if (mDeviceIsProvisioned != deviceProvisioned) {
                                    mDeviceIsProvisioned = deviceProvisioned;
                                    restartNavBars();
                                }
                            });
                        }
                    });
        }

        // Register a listener for driving state changes.
        mDrivingStateHelper = new DrivingStateHelper(mContext, this::onDrivingStateChanged);
        mDrivingStateHelper.connectToCarService();

        mSwitchToGuestTimer = new SwitchToGuestTimer(mContext);
    }

    /**
     * Remove all content from navbars and rebuild them. Used to allow for different nav bars
     * before and after the device is provisioned. . Also for change of density and font size.
     */
    private void restartNavBars() {
        // remove and reattach all hvac components such that we don't keep a reference to unused
        // ui elements
        mHvacController.removeAllComponents();
        addTemperatureViewToController(mStatusBarWindow);
        mCarFacetButtonController.removeAll();
        if (mNavigationBarWindow != null) {
            mNavigationBarWindow.removeAllViews();
            mNavigationBarView = null;
        }

        if (mLeftNavigationBarWindow != null) {
            mLeftNavigationBarWindow.removeAllViews();
            mLeftNavigationBarView = null;
        }

        if (mRightNavigationBarWindow != null) {
            mRightNavigationBarWindow.removeAllViews();
            mRightNavigationBarView = null;
        }

        buildNavBarContent();
        // If the UI was rebuilt (day/night change) while the keyguard was up we need to
        // correctly respect that state.
        if (mIsKeyguard) {
            updateNavBarForKeyguardContent();
        }
        // CarFacetButtonController was reset therefore we need to re-add the status bar elements
        // to the controller.
        mCarFacetButtonController.addAllFacetButtons(mStatusBarWindow);
    }

    private void addTemperatureViewToController(View v) {
        if (v instanceof TemperatureView) {
            mHvacController.addHvacTextView((TemperatureView) v);
        } else if (v instanceof ViewGroup) {
            ViewGroup viewGroup = (ViewGroup) v;
            for (int i = 0; i < viewGroup.getChildCount(); i++) {
                addTemperatureViewToController(viewGroup.getChildAt(i));
            }
        }
    }

    /**
     * Allows for showing or hiding just the navigation bars. This is indented to be used when
     * the full screen user selector is shown.
     */
    void setNavBarVisibility(@View.Visibility int visibility) {
        if (mNavigationBarWindow != null) {
            mNavigationBarWindow.setVisibility(visibility);
        }
        if (mLeftNavigationBarWindow != null) {
            mLeftNavigationBarWindow.setVisibility(visibility);
        }
        if (mRightNavigationBarWindow != null) {
            mRightNavigationBarWindow.setVisibility(visibility);
        }
    }


    @Override
    public boolean hideKeyguard() {
        boolean result = super.hideKeyguard();
        if (mNavigationBarView != null) {
            mNavigationBarView.hideKeyguardButtons();
        }
        if (mLeftNavigationBarView != null) {
            mLeftNavigationBarView.hideKeyguardButtons();
        }
        if (mRightNavigationBarView != null) {
            mRightNavigationBarView.hideKeyguardButtons();
        }
        return result;
    }


    @Override
    public void showKeyguard() {
        super.showKeyguard();
        updateNavBarForKeyguardContent();
    }

    /**
     * Switch to the keyguard applicable content contained in the nav bars
     */
    private void updateNavBarForKeyguardContent() {
        if (mNavigationBarView != null) {
            mNavigationBarView.showKeyguardButtons();
        }
        if (mLeftNavigationBarView != null) {
            mLeftNavigationBarView.showKeyguardButtons();
        }
        if (mRightNavigationBarView != null) {
            mRightNavigationBarView.showKeyguardButtons();
        }
    }


    @Override
    protected void makeStatusBarView() {
        super.makeStatusBarView();
        mHvacController = new HvacController(mContext);

        CarSystemUIFactory factory = SystemUIFactory.getInstance();
        mCarFacetButtonController = factory.getCarDependencyComponent()
            .getCarFacetButtonController();
        mNotificationPanelBackground = getDefaultWallpaper();
        mScrimController.setScrimBehindDrawable(mNotificationPanelBackground);

        FragmentHostManager manager = FragmentHostManager.get(mStatusBarWindow);
        manager.addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {
            mBatteryMeterView = fragment.getView().findViewById(R.id.battery);

            // By default, the BatteryMeterView should not be visible. It will be toggled
            // when a device has connected by bluetooth.
            mBatteryMeterView.setVisibility(View.GONE);
        });

        connectNotificationsUI();
    }

    /**
     * Attach the notification listeners and controllers to the UI as well as build all the
     * touch listeners needed for opening and closing the notification panel
     */
    private void connectNotificationsUI() {
        // Attached to the status bar to detect pull down of the notification shade.
        GestureDetector openGestureDetector = new GestureDetector(mContext,
                new OpenNotificationGestureListener() {
                    @Override
                    protected void openNotification() {
                        animateExpandNotificationsPanel();
                    }
                });
        // Attached to the notification ui to detect close request of the notification shade.
        GestureDetector closeGestureDetector = new GestureDetector(mContext,
                new CloseNotificationGestureListener() {
                    @Override
                    protected void close() {
                        animateCollapsePanels();
                    }
                });
        // Attached to the NavBars to close the notification shade
        GestureDetector navBarCloseNotificationGestureDetector = new GestureDetector(mContext,
                new NavBarCloseNotificationGestureListener() {
                    @Override
                    protected void close() {
                        animateCollapsePanels();
                    }
                });
        mNavBarNotificationTouchListener =
                (v, event) -> navBarCloseNotificationGestureDetector.onTouchEvent(event);

        // The following are the ui elements that the user would call the status bar.
        // This will set the status bar so it they can make call backs.
        CarNavigationBarView topBar = mStatusBarWindow.findViewById(R.id.car_top_bar);
        topBar.setStatusBar(this);
        topBar.setStatusBarWindowTouchListener((v1, event1) ->
                openGestureDetector.onTouchEvent(event1));

        NotificationClickHandlerFactory clickHandlerFactory = new NotificationClickHandlerFactory(
                mBarService,
                launchResult -> {
                    if (launchResult == ActivityManager.START_TASK_TO_FRONT
                            || launchResult == ActivityManager.START_SUCCESS) {
                        animateCollapsePanels();
                    }
                });
        CarNotificationListener carNotificationListener = new CarNotificationListener();
        CarUxRestrictionManagerWrapper carUxRestrictionManagerWrapper =
                new CarUxRestrictionManagerWrapper();
        carNotificationListener.registerAsSystemService(mContext, carUxRestrictionManagerWrapper,
                clickHandlerFactory);

        mNotificationView = mStatusBarWindow.findViewById(R.id.notification_view);
        View glassPane = mStatusBarWindow.findViewById(R.id.glass_pane);
        mNotificationView.setClickHandlerFactory(clickHandlerFactory);

        // The glass pane is used to view touch events before passed to the notification list.
        // This allows us to initialize gesture listeners and detect when to close the notifications
        glassPane.setOnTouchListener((v, event) -> {
            if (event.getActionMasked() == MotionEvent.ACTION_UP) {
                mNotificationListAtBottomAtTimeOfTouch = false;
            }
            if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
                mNotificationListAtBottomAtTimeOfTouch = mNotificationListAtBottom;
                // Pass the down event to gesture detector so that it knows where the touch event
                // started.
                closeGestureDetector.onTouchEvent(event);
            }
            return false;
        });
        mNotificationList = mNotificationView.findViewById(R.id.notifications);
        mNotificationList.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if (!mNotificationList.canScrollVertically(1)) {
                    mNotificationListAtBottom = true;
                    return;
                }
                mNotificationListAtBottom = false;
                mNotificationListAtBottomAtTimeOfTouch = false;
            }
        });
        mNotificationList.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                boolean handled = false;
                if (mNotificationListAtBottomAtTimeOfTouch && mNotificationListAtBottom) {
                    handled = closeGestureDetector.onTouchEvent(event);
                }
                // Updating the mNotificationListAtBottomAtTimeOfTouch state has to be done after
                // the event has been passed to the closeGestureDetector above, such that the
                // closeGestureDetector sees the up event before the state has changed.
                if (event.getActionMasked() == MotionEvent.ACTION_UP) {
                    mNotificationListAtBottomAtTimeOfTouch = false;
                }
                return handled;
            }
        });

        NotificationViewController mNotificationViewController = new NotificationViewController(
                mNotificationView,
                PreprocessingManager.getInstance(mContext),
                carNotificationListener,
                carUxRestrictionManagerWrapper);
        mNotificationViewController.enable();
    }

    @Override
    public void animateExpandNotificationsPanel() {
        if (!mCommandQueue.panelsEnabled() || !mUserSetup) {
            return;
        }
        // scroll to top
        mNotificationList.scrollToPosition(0);
        mStatusBarWindowController.setPanelVisible(true);
        mNotificationView.setVisibility(View.VISIBLE);
        // let the status bar know that the panel is open
        setPanelExpanded(true);
    }

    @Override
    public void animateCollapsePanels(int flags, boolean force, boolean delayed,
            float speedUpFactor) {
        super.animateCollapsePanels(flags, force, delayed, speedUpFactor);
        if (!mPanelExpanded || mNotificationView.getVisibility() == View.INVISIBLE) {
            return;
        }
        mStatusBarWindowController.setStatusBarFocusable(false);
        mStatusBarWindow.cancelExpandHelper();
        mStatusBarView.collapsePanel(true /* animate */, delayed, speedUpFactor);
        mStatusBarWindowController.setPanelVisible(false);
        mNotificationView.setVisibility(View.INVISIBLE);
        // let the status bar know that the panel is cloased
        setPanelExpanded(false);
    }


    @Override
    protected QS createDefaultQSFragment() {
        return new CarQSFragment();
    }

    private BatteryController createBatteryController() {
        mCarBatteryController = new CarBatteryController(mContext);
        mCarBatteryController.addBatteryViewHandler(this);
        return mCarBatteryController;
    }

    @Override
    protected void createNavigationBar() {
        mShowBottom = mContext.getResources().getBoolean(R.bool.config_enableBottomNavigationBar);
        mShowLeft = mContext.getResources().getBoolean(R.bool.config_enableLeftNavigationBar);
        mShowRight = mContext.getResources().getBoolean(R.bool.config_enableRightNavigationBar);

        buildNavBarWindows();
        buildNavBarContent();
        attachNavBarWindows();

        // There has been a car customized nav bar on the default display, so just create nav bars
        // on external displays.
        mNavigationBarController.createNavigationBars(false /* includeDefaultDisplay */);
    }

    private void buildNavBarContent() {
        if (mShowBottom) {
            buildBottomBar((mDeviceIsProvisioned) ? R.layout.car_navigation_bar :
                    R.layout.car_navigation_bar_unprovisioned);
        }

        if (mShowLeft) {
            buildLeft((mDeviceIsProvisioned) ? R.layout.car_left_navigation_bar :
                    R.layout.car_left_navigation_bar_unprovisioned);
        }

        if (mShowRight) {
            buildRight((mDeviceIsProvisioned) ? R.layout.car_right_navigation_bar :
                    R.layout.car_right_navigation_bar_unprovisioned);
        }
    }

    private void buildNavBarWindows() {
        if (mShowBottom) {
            mNavigationBarWindow = (ViewGroup) View.inflate(mContext,
                    R.layout.navigation_bar_window, null);
        }
        if (mShowLeft) {
            mLeftNavigationBarWindow = (ViewGroup) View.inflate(mContext,
                    R.layout.navigation_bar_window, null);
        }
        if (mShowRight) {
            mRightNavigationBarWindow = (ViewGroup) View.inflate(mContext,
                    R.layout.navigation_bar_window, null);
        }

    }

    private void attachNavBarWindows() {

        if (mShowBottom) {
            WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
                    LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,
                    WindowManager.LayoutParams.TYPE_NAVIGATION_BAR,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                            | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                            | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                            | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH,
                    PixelFormat.TRANSLUCENT);
            lp.setTitle("CarNavigationBar");
            lp.windowAnimations = 0;
            mWindowManager.addView(mNavigationBarWindow, lp);
        }

        if (mShowLeft) {
            int width = mContext.getResources().getDimensionPixelSize(
                    R.dimen.car_left_navigation_bar_width);
            WindowManager.LayoutParams leftlp = new WindowManager.LayoutParams(
                    width, LayoutParams.MATCH_PARENT,
                    WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                            | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                            | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                            | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH,
                    PixelFormat.TRANSLUCENT);
            leftlp.setTitle("LeftCarNavigationBar");
            leftlp.windowAnimations = 0;
            leftlp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_IS_SCREEN_DECOR;
            leftlp.gravity = Gravity.LEFT;
            mWindowManager.addView(mLeftNavigationBarWindow, leftlp);
        }
        if (mShowRight) {
            int width = mContext.getResources().getDimensionPixelSize(
                    R.dimen.car_right_navigation_bar_width);
            WindowManager.LayoutParams rightlp = new WindowManager.LayoutParams(
                    width, LayoutParams.MATCH_PARENT,
                    WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                            | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                            | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                            | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH,
                    PixelFormat.TRANSLUCENT);
            rightlp.setTitle("RightCarNavigationBar");
            rightlp.windowAnimations = 0;
            rightlp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_IS_SCREEN_DECOR;
            rightlp.gravity = Gravity.RIGHT;
            mWindowManager.addView(mRightNavigationBarWindow, rightlp);
        }

    }

    private void buildBottomBar(int layout) {
        // SystemUI requires that the navigation bar view have a parent. Since the regular
        // StatusBar inflates navigation_bar_window as this parent view, use the same view for the
        // CarNavigationBarView.
        View.inflate(mContext, layout, mNavigationBarWindow);
        mNavigationBarView = (CarNavigationBarView) mNavigationBarWindow.getChildAt(0);
        if (mNavigationBarView == null) {
            Log.e(TAG, "CarStatusBar failed inflate for R.layout.car_navigation_bar");
            throw new RuntimeException("Unable to build botom nav bar due to missing layout");
        }
        mNavigationBarView.setStatusBar(this);
        addTemperatureViewToController(mNavigationBarView);
        mNavigationBarView.setStatusBarWindowTouchListener(mNavBarNotificationTouchListener);
    }

    private void buildLeft(int layout) {
        View.inflate(mContext, layout, mLeftNavigationBarWindow);
        mLeftNavigationBarView = (CarNavigationBarView) mLeftNavigationBarWindow.getChildAt(0);
        if (mLeftNavigationBarView == null) {
            Log.e(TAG, "CarStatusBar failed inflate for R.layout.car_navigation_bar");
            throw new RuntimeException("Unable to build left nav bar due to missing layout");
        }
        mLeftNavigationBarView.setStatusBar(this);
        addTemperatureViewToController(mLeftNavigationBarView);
        mLeftNavigationBarView.setStatusBarWindowTouchListener(mNavBarNotificationTouchListener);
    }


    private void buildRight(int layout) {
        View.inflate(mContext, layout, mRightNavigationBarWindow);
        mRightNavigationBarView = (CarNavigationBarView) mRightNavigationBarWindow.getChildAt(0);
        if (mRightNavigationBarView == null) {
            Log.e(TAG, "CarStatusBar failed inflate for R.layout.car_navigation_bar");
            throw new RuntimeException("Unable to build right nav bar due to missing layout");
        }
        mRightNavigationBarView.setStatusBar(this);
        addTemperatureViewToController(mRightNavigationBarView);
        mRightNavigationBarView.setStatusBarWindowTouchListener(mNavBarNotificationTouchListener);
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        //When executing dump() funciton simultaneously, we need to serialize them
        //to get mStackScroller's position correctly.
        synchronized (mQueueLock) {
            pw.println("  mStackScroller: " + viewInfo(mStackScroller));
            pw.println("  mStackScroller: " + viewInfo(mStackScroller)
                    + " scroll " + mStackScroller.getScrollX()
                    + "," + mStackScroller.getScrollY());
        }

        pw.print("  mTaskStackListener=");
        pw.println(mTaskStackListener);
        pw.print("  mCarFacetButtonController=");
        pw.println(mCarFacetButtonController);
        pw.print("  mFullscreenUserSwitcher=");
        pw.println(mFullscreenUserSwitcher);
        pw.print("  mCarBatteryController=");
        pw.println(mCarBatteryController);
        pw.print("  mBatteryMeterView=");
        pw.println(mBatteryMeterView);
        pw.print("  mNavigationBarView=");
        pw.println(mNavigationBarView);

        if (KeyguardUpdateMonitor.getInstance(mContext) != null) {
            KeyguardUpdateMonitor.getInstance(mContext).dump(fd, pw, args);
        }

        FalsingManager.getInstance(mContext).dump(pw);
        FalsingLog.dump(pw);

        pw.println("SharedPreferences:");
        for (Map.Entry<String, ?> entry : Prefs.getAll(mContext).entrySet()) {
            pw.print("  ");
            pw.print(entry.getKey());
            pw.print("=");
            pw.println(entry.getValue());
        }
    }


    @Override
    public void showBatteryView() {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "showBatteryView(). mBatteryMeterView: " + mBatteryMeterView);
        }

        if (mBatteryMeterView != null) {
            mBatteryMeterView.setVisibility(View.VISIBLE);
        }
    }

    @Override
    public void hideBatteryView() {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "hideBatteryView(). mBatteryMeterView: " + mBatteryMeterView);
        }

        if (mBatteryMeterView != null) {
            mBatteryMeterView.setVisibility(View.GONE);
        }
    }

    /**
     * An implementation of TaskStackChangeListener, that listens for changes in the system
     * task stack and notifies the navigation bar.
     */
    private class TaskStackListenerImpl extends TaskStackChangeListener {
        @Override
        public void onTaskStackChanged() {
            try {
                mCarFacetButtonController.taskChanged(
                        ActivityTaskManager.getService().getAllStackInfos());
            } catch (Exception e) {
                Log.e(TAG, "Getting StackInfo from activity manager failed", e);
            }
        }
    }

    private void onDrivingStateChanged(CarDrivingStateEvent notUsed) {
        // Check if we need to start the timer every time driving state changes.
        startSwitchToGuestTimerIfDrivingOnKeyguard();
    }

    private void startSwitchToGuestTimerIfDrivingOnKeyguard() {
        if (mDrivingStateHelper.isCurrentlyDriving() && mState != StatusBarState.SHADE) {
            // We're driving while keyguard is up.
            mSwitchToGuestTimer.start();
        } else {
            mSwitchToGuestTimer.cancel();
        }
    }

    @Override
    protected void createUserSwitcher() {
        UserSwitcherController userSwitcherController =
                Dependency.get(UserSwitcherController.class);
        if (userSwitcherController.useFullscreenUserSwitcher()) {
            mFullscreenUserSwitcher = new FullscreenUserSwitcher(this,
                    mStatusBarWindow.findViewById(R.id.fullscreen_user_switcher_stub), mContext);
        } else {
            super.createUserSwitcher();
        }
    }

    @Override
    public void setLockscreenUser(int newUserId) {
        super.setLockscreenUser(newUserId);
        // Try to dismiss the keyguard after every user switch.
        dismissKeyguardWhenUserSwitcherNotDisplayed();
    }

    @Override
    public void onStateChanged(int newState) {
        super.onStateChanged(newState);

        startSwitchToGuestTimerIfDrivingOnKeyguard();

        if (newState != StatusBarState.FULLSCREEN_USER_SWITCHER) {
            hideUserSwitcher();
        } else {
            dismissKeyguardWhenUserSwitcherNotDisplayed();
        }
    }

    /** Makes the full screen user switcher visible, if applicable. */
    public void showUserSwitcher() {
        if (mFullscreenUserSwitcher != null && mState == StatusBarState.FULLSCREEN_USER_SWITCHER) {
            mFullscreenUserSwitcher.show(); // Makes the switcher visible.
        }
    }

    private void hideUserSwitcher() {
        if (mFullscreenUserSwitcher != null) {
            mFullscreenUserSwitcher.hide();
        }
    }

    // We automatically dismiss keyguard unless user switcher is being shown on the keyguard.
    private void dismissKeyguardWhenUserSwitcherNotDisplayed() {
        if (mFullscreenUserSwitcher == null) {
            return; // Not using the full screen user switcher.
        }

        if (mState == StatusBarState.FULLSCREEN_USER_SWITCHER
                && !mFullscreenUserSwitcher.isVisible()) {
            // Current execution path continues to set state after this, thus we deffer the
            // dismissal to the next execution cycle.
            postDismissKeyguard(); // Dismiss the keyguard if switcher is not visible.
        }
    }

    public void postDismissKeyguard() {
        mHandler.post(this::dismissKeyguard);
    }

    /**
     * Dismisses the keyguard and shows bouncer if authentication is necessary.
     */
    public void dismissKeyguard() {
        executeRunnableDismissingKeyguard(null/* runnable */, null /* cancelAction */,
                true /* dismissShade */, true /* afterKeyguardGone */, true /* deferred */);
    }

    /**
     * Ensures that relevant child views are appropriately recreated when the device's density
     * changes.
     */
    @Override
    public void onDensityOrFontScaleChanged() {
        super.onDensityOrFontScaleChanged();
        restartNavBars();
        // Need to update the background on density changed in case the change was due to night
        // mode.
        mNotificationPanelBackground = getDefaultWallpaper();
        mScrimController.setScrimBehindDrawable(mNotificationPanelBackground);
    }

    /**
     * Returns the {@link Drawable} that represents the wallpaper that the user has currently set.
     */
    private Drawable getDefaultWallpaper() {
        return mContext.getDrawable(com.android.internal.R.drawable.default_wallpaper);
    }

    /** Returns true if the current user makes it through the setup wizard, false otherwise. */
    public boolean getIsUserSetup(){
        return mUserSetup;
    }


    // TODO: add settle down/up logic
    private static final int SWIPE_UP_MIN_DISTANCE = 75;
    private static final int SWIPE_DOWN_MIN_DISTANCE = 25;
    private static final int SWIPE_MAX_OFF_PATH = 75;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    // Only responsible for open hooks. Since once the panel opens it covers all elements
    // there is no need to merge with close.
    private abstract class OpenNotificationGestureListener extends
            GestureDetector.SimpleOnGestureListener {

        @Override
        public boolean onFling(MotionEvent event1, MotionEvent event2,
                float velocityX, float velocityY) {
            if (Math.abs(event1.getX() - event2.getX()) > SWIPE_MAX_OFF_PATH
                    || Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY) {
                // swipe was not vertical or was not fast enough
                return false;
            }
            boolean isDown = velocityY > 0;
            float distanceDelta = Math.abs(event1.getY() - event2.getY());
            if (isDown && distanceDelta > SWIPE_DOWN_MIN_DISTANCE) {
                openNotification();
                return true;
            }

            return false;
        }
        protected abstract void openNotification();
    }

    // to be installed on the open panel notification panel
    private abstract class CloseNotificationGestureListener extends
            GestureDetector.SimpleOnGestureListener {

        @Override
        public boolean onFling(MotionEvent event1, MotionEvent event2,
                float velocityX, float velocityY) {
            if (Math.abs(event1.getX() - event2.getX()) > SWIPE_MAX_OFF_PATH
                    || Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY) {
                // swipe was not vertical or was not fast enough
                return false;
            }
            boolean isUp = velocityY < 0;
            float distanceDelta = Math.abs(event1.getY() - event2.getY());
            if (isUp && distanceDelta > SWIPE_UP_MIN_DISTANCE) {
                close();
                return true;
            }
            return false;
        }
        protected abstract void close();
    }

    // to be installed on the nav bars
    private abstract class NavBarCloseNotificationGestureListener extends
            CloseNotificationGestureListener {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            close();
            return super.onSingleTapUp(e);
        }

        @Override
        public void onLongPress(MotionEvent e) {
            close();
            super.onLongPress(e);
        }
    }
}