Remove unused PreviewPreviewer

/*

 * Copyright (C) 2020 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.customization.picker;

import android.app.Activity;

import android.app.WallpaperColors;

import android.content.Intent;

import android.graphics.Rect;

import android.graphics.RenderEffect;

import android.graphics.Shader.TileMode;

import android.service.wallpaper.WallpaperService;

import android.view.Surface;

import android.view.SurfaceView;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import androidx.annotation.MainThread;

import androidx.annotation.Nullable;

import androidx.cardview.widget.CardView;

import androidx.lifecycle.Lifecycle;

import androidx.lifecycle.LifecycleObserver;

import androidx.lifecycle.OnLifecycleEvent;

import com.android.wallpaper.model.LiveWallpaperInfo;

import com.android.wallpaper.model.WallpaperInfo;

import com.android.wallpaper.util.ResourceUtils;

import com.android.wallpaper.util.ScreenSizeCalculator;

import com.android.wallpaper.util.SizeCalculator;

import com.android.wallpaper.util.VideoWallpaperUtils;

import com.android.wallpaper.util.WallpaperConnection;

import com.android.wallpaper.util.WallpaperConnection.WallpaperConnectionListener;

import com.android.wallpaper.util.WallpaperSurfaceCallback;

import com.android.wallpaper.widget.WallpaperColorsLoader;

/** A class to load the wallpaper to the view. */

public class WallpaperPreviewer implements LifecycleObserver {

    private final Rect mPreviewLocalRect = new Rect();

    private final Rect mPreviewGlobalRect = new Rect();

    private final int[] mLivePreviewLocation = new int[2];

    private final Activity mActivity;

    private final ImageView mHomePreview;

    private final SurfaceView mWallpaperSurface;

    @Nullable private final ImageView mFadeInScrim;

    private WallpaperSurfaceCallback mWallpaperSurfaceCallback;

    private WallpaperInfo mWallpaper;

    private WallpaperConnection mWallpaperConnection;

    @Nullable private WallpaperColorsListener mWallpaperColorsListener;

    /** Interface for getting {@link WallpaperColors} from wallpaper. */

    public interface WallpaperColorsListener {

        /** Gets called when wallpaper color is available or updated. */

        void onWallpaperColorsChanged(WallpaperColors colors);

    }

    public WallpaperPreviewer(Lifecycle lifecycle, Activity activity, ImageView homePreview,

                              SurfaceView wallpaperSurface) {

        this(lifecycle, activity, homePreview, wallpaperSurface, null);

    }

    public WallpaperPreviewer(Lifecycle lifecycle, Activity activity, ImageView homePreview,

                              SurfaceView wallpaperSurface, @Nullable ImageView fadeInScrim) {

        lifecycle.addObserver(this);

        mActivity = activity;

        mHomePreview = homePreview;

        mWallpaperSurface = wallpaperSurface;

        mFadeInScrim = fadeInScrim;

        mWallpaperSurfaceCallback = new WallpaperSurfaceCallback(activity, mHomePreview,

                mWallpaperSurface, this::setUpWallpaperPreview);

        mWallpaperSurface.setZOrderMediaOverlay(true);

        mWallpaperSurface.getHolder().addCallback(mWallpaperSurfaceCallback);

        View rootView = homePreview.getRootView();

        rootView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {

            @Override

            public void onLayoutChange(View v, int left, int top, int right, int bottom,

                                       int oldLeft, int oldTop, int oldRight, int oldBottom) {

                updatePreviewCardRadius();

                rootView.removeOnLayoutChangeListener(this);

            }

        });

    }

    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)

    @MainThread

    public void onResume() {

        if (mWallpaperConnection != null) {

            mWallpaperConnection.setVisibility(true);

        }

    }

    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)

    @MainThread

    public void onPause() {

        if (mWallpaperConnection != null) {

            mWallpaperConnection.setVisibility(false);

        }

    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)

    @MainThread

    public void onStop() {

        if (mWallpaperConnection != null) {

            mWallpaperConnection.disconnect();

            mWallpaperConnection = null;

        }

    }

    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)

    @MainThread

    public void onDestroy() {

        if (mWallpaperConnection != null) {

            mWallpaperConnection.disconnect();

            mWallpaperConnection = null;

        }

        mWallpaperSurfaceCallback.cleanUp();

        mWallpaperSurface.getHolder().removeCallback(mWallpaperSurfaceCallback);

        Surface surface = mWallpaperSurface.getHolder().getSurface();

        if (surface != null) {

            surface.release();

        }

    }

    /**

     * Sets a wallpaper to be shown on preview screen.

     *

     * @param wallpaperInfo the wallpaper to preview

     * @param listener the listener for getting the wallpaper color of {@param wallpaperInfo}

     */

    public void setWallpaper(WallpaperInfo wallpaperInfo,

                             @Nullable WallpaperColorsListener listener) {

        mWallpaper = wallpaperInfo;

        mWallpaperColorsListener = listener;

        if (mFadeInScrim != null && VideoWallpaperUtils.needsFadeIn(wallpaperInfo)) {

            mFadeInScrim.animate().cancel();

            mFadeInScrim.setAlpha(1f);

            mFadeInScrim.setVisibility(View.VISIBLE);

        }

        setUpWallpaperPreview();

    }

    private void setUpWallpaperPreview() {

        ImageView homeImageWallpaper = mWallpaperSurfaceCallback.getHomeImageWallpaper();

        if (mWallpaper != null && homeImageWallpaper != null) {

            homeImageWallpaper.post(() -> {

                if (mActivity == null || mActivity.isDestroyed()) {

                    return;

                }

                boolean renderInImageWallpaperSurface = !(mWallpaper instanceof LiveWallpaperInfo);

                mWallpaper.getThumbAsset(mActivity.getApplicationContext())

                        .loadPreviewImage(mActivity,

                                renderInImageWallpaperSurface ? homeImageWallpaper : mHomePreview,

                                ResourceUtils.getColorAttr(

                                        mActivity, android.R.attr.colorSecondary),

                                /* offsetToStart= */ true);

                if (mWallpaper instanceof LiveWallpaperInfo) {

                    ImageView preview = homeImageWallpaper;

                    if (VideoWallpaperUtils.needsFadeIn(mWallpaper) && mFadeInScrim != null) {

                        preview = mFadeInScrim;

                        preview.setRenderEffect(

                                RenderEffect.createBlurEffect(150f, 150f, TileMode.CLAMP));

                    }

                    mWallpaper.getThumbAsset(mActivity.getApplicationContext())

                            .loadPreviewImage(

                                    mActivity,

                                    preview,

                                    ResourceUtils.getColorAttr(

                                            mActivity, android.R.attr.colorSecondary),

                                    /* offsetToStart= */ true);

                    setUpLiveWallpaperPreview(mWallpaper);

                } else {

                    // Ensure live wallpaper connection is disconnected.

                    if (mWallpaperConnection != null) {

                        mWallpaperConnection.disconnect();

                        mWallpaperConnection = null;

                    }

                    // Load wallpaper color for static wallpaper.

                    if (mWallpaperColorsListener != null) {

                        WallpaperColorsLoader.getWallpaperColors(

                                mActivity,

                                mWallpaper.getThumbAsset(mActivity),

                                mWallpaperColorsListener::onWallpaperColorsChanged);

                    }

                }

            });

        }

    }

    private void setUpLiveWallpaperPreview(WallpaperInfo homeWallpaper) {

        if (mActivity == null || mActivity.isFinishing()) {

            return;

        }

        if (mWallpaperConnection != null) {

            mWallpaperConnection.disconnect();

        }

        if (WallpaperConnection.isPreviewAvailable()) {

            mHomePreview.getLocationOnScreen(mLivePreviewLocation);

            mPreviewGlobalRect.set(0, 0, mHomePreview.getMeasuredWidth(),

                    mHomePreview.getMeasuredHeight());

            mPreviewLocalRect.set(mPreviewGlobalRect);

            mPreviewGlobalRect.offset(mLivePreviewLocation[0], mLivePreviewLocation[1]);

            mWallpaperConnection = new WallpaperConnection(

                    getWallpaperIntent(homeWallpaper.getWallpaperComponent()), mActivity,

                    new WallpaperConnectionListener() {

                        @Override

                        public void onWallpaperColorsChanged(WallpaperColors colors,

                                int displayId) {

                            if (mWallpaperColorsListener != null) {

                                mWallpaperColorsListener.onWallpaperColorsChanged(colors);

                            }

                        }

                        @Override

                        public void onEngineShown() {

                            if (mFadeInScrim != null && VideoWallpaperUtils.needsFadeIn(

                                    homeWallpaper)) {

                                mFadeInScrim.animate().alpha(0.0f)

                                        .setDuration(VideoWallpaperUtils.TRANSITION_MILLIS)

                                        .withEndAction(

                                                () -> mFadeInScrim.setVisibility(View.INVISIBLE));

                            }

                        }

                    }, mWallpaperSurface, WallpaperConnection.WhichPreview.PREVIEW_CURRENT);

            mWallpaperConnection.setVisibility(true);

            mHomePreview.post(() -> {

                if (mWallpaperConnection != null && !mWallpaperConnection.connect()) {

                    mWallpaperConnection = null;

                }

            });

        } else {

            // Load wallpaper color from the thumbnail.

            if (mWallpaperColorsListener != null) {

                WallpaperColorsLoader.getWallpaperColors(

                        mActivity,

                        mWallpaper.getThumbAsset(mActivity),

                        mWallpaperColorsListener::onWallpaperColorsChanged);

            }

        }

    }

    /** Updates the preview card view corner radius to match the device corner radius. */

    private void updatePreviewCardRadius() {

        final float screenAspectRatio =

                ScreenSizeCalculator.getInstance().getScreenAspectRatio(mActivity);

        CardView cardView = (CardView) mHomePreview.getParent();

        final int cardWidth = (int) (cardView.getMeasuredHeight() / screenAspectRatio);

        ViewGroup.LayoutParams layoutParams = cardView.getLayoutParams();

        layoutParams.width = cardWidth;

        cardView.setLayoutParams(layoutParams);

        cardView.setRadius(SizeCalculator.getPreviewCornerRadius(mActivity, cardWidth));

    }

    private static Intent getWallpaperIntent(android.app.WallpaperInfo info) {

        return new Intent(WallpaperService.SERVICE_INTERFACE)

                .setClassName(info.getPackageName(), info.getServiceName());

    }

}