Merge "Added mechanisms for updating the UI on rotation & on configuration change."

package com.android.systemui.accessibility.accessibilitymenu;

import android.accessibilityservice.AccessibilityService;

import android.content.res.Configuration;

import android.hardware.display.DisplayManager;

import android.os.Handler;

import android.view.Display;

import android.view.MotionEvent;

import android.view.View;

import android.view.accessibility.AccessibilityEvent;

public class AccessibilityMenuService extends AccessibilityService implements View.OnTouchListener {

    private static final String TAG = "A11yMenuService";

    private static final long BUFFER_MILLISECONDS_TO_PREVENT_UPDATE_FAILURE = 100L;

    private A11yMenuOverlayLayout mA11yMenuLayout;

    private static boolean sInitialized = false;

    // TODO(b/136716947): Support multi-display once a11y framework side is ready.

    private DisplayManager mDisplayManager;

    final DisplayManager.DisplayListener mDisplayListener = new DisplayManager.DisplayListener() {

        int mRotation;

        @Override

        public void onDisplayAdded(int displayId) {}

        @Override

        public void onDisplayRemoved(int displayId) {

            // TODO(b/136716947): Need to reset A11yMenuOverlayLayout by display id.

        }

        @Override

        public void onDisplayChanged(int displayId) {

            Display display = mDisplayManager.getDisplay(Display.DEFAULT_DISPLAY);

            if (mRotation != display.getRotation()) {

                mRotation = display.getRotation();

                mA11yMenuLayout.updateViewLayout();

            }

        }

    };

    // Update layout.

    private final Handler mHandler = new Handler(getMainLooper());

    private final Runnable mOnConfigChangedRunnable = new Runnable() {

        @Override

        public void run() {

            if (!sInitialized) {

                return;

            }

            // Re-assign theme to service after onConfigurationChanged

            getTheme().applyStyle(R.style.ServiceTheme, true);

            // Caches & updates the page index to ViewPager when a11y menu is refreshed.

            // Otherwise, the menu page would reset on a UI update.

            int cachedPageIndex = mA11yMenuLayout.getPageIndex();

            mA11yMenuLayout.configureLayout(cachedPageIndex);

        }

    };

    @Override

    public void onCreate() {

        super.onCreate();

    }

    @Override

    public void onDestroy() {

        if (mHandler.hasCallbacks(mOnConfigChangedRunnable)) {

            mHandler.removeCallbacks(mOnConfigChangedRunnable);

        }

        super.onDestroy();

    }

    @Override

    protected void onServiceConnected() {

        mA11yMenuLayout = new A11yMenuOverlayLayout(this);

        super.onServiceConnected();

        // Temporary measure to force visibility

        mA11yMenuLayout.toggleVisibility();

        mDisplayManager = getSystemService(DisplayManager.class);

        mDisplayManager.registerDisplayListener(mDisplayListener, null);

        sInitialized = true;

    }

    @Override

    public void onAccessibilityEvent(AccessibilityEvent event) {}

    /**

     * This method would notify service when device configuration, such as display size,

     * localization, orientation or theme, is changed.

     *

     * @param newConfig the new device configuration.

     */

    @Override

    public void onConfigurationChanged(Configuration newConfig) {

        // Prevent update layout failure

        // if multiple onConfigurationChanged are called at the same time.

        if (mHandler.hasCallbacks(mOnConfigChangedRunnable)) {

            mHandler.removeCallbacks(mOnConfigChangedRunnable);

        }

        mHandler.postDelayed(

                mOnConfigChangedRunnable, BUFFER_MILLISECONDS_TO_PREVENT_UPDATE_FAILURE);

    }

    @Override

    public void onInterrupt() {

    }