/* * Copyright (C) 2019 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.model.grid; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.content.res.Resources; import android.database.ContentObserver; import android.database.Cursor; import android.net.Uri; import android.os.Handler; import androidx.annotation.Nullable; import androidx.annotation.WorkerThread; import androidx.lifecycle.LiveData; import androidx.lifecycle.MutableLiveData; import com.android.customization.model.ResourceConstants; import com.android.themepicker.R; import com.android.wallpaper.config.BaseFlags; import com.android.wallpaper.util.PreviewUtils; import java.util.ArrayList; import java.util.List; /** * Abstracts the logic to retrieve available grid options from the current Launcher. */ public class LauncherGridOptionsProvider { private static final String LIST_OPTIONS = "list_options"; private static final String PREVIEW = "preview"; private static final String DEFAULT_GRID = "default_grid"; private static final String COL_NAME = "name"; private static final String COL_ROWS = "rows"; private static final String COL_COLS = "cols"; private static final String COL_PREVIEW_COUNT = "preview_count"; private static final String COL_IS_DEFAULT = "is_default"; private static final String METADATA_KEY_PREVIEW_VERSION = "preview_version"; private final Context mContext; private final PreviewUtils mPreviewUtils; private final boolean mIsGridApplyButtonEnabled; private List mOptions; private OptionChangeLiveData mLiveData; public LauncherGridOptionsProvider(Context context, String authorityMetadataKey) { mPreviewUtils = new PreviewUtils(context, authorityMetadataKey); mContext = context; mIsGridApplyButtonEnabled = BaseFlags.get().isGridApplyButtonEnabled(context); } boolean areGridsAvailable() { return mPreviewUtils.supportsPreview(); } /** * Retrieve the available grids. * @param reload whether to reload grid options if they're cached. */ @WorkerThread @Nullable List fetch(boolean reload) { if (!areGridsAvailable()) { return null; } if (mOptions != null && !reload) { return mOptions; } ContentResolver resolver = mContext.getContentResolver(); String iconPath = mContext.getResources().getString(Resources.getSystem().getIdentifier( ResourceConstants.CONFIG_ICON_MASK, "string", ResourceConstants.ANDROID_PACKAGE)); try (Cursor c = resolver.query(mPreviewUtils.getUri(LIST_OPTIONS), null, null, null, null)) { mOptions = new ArrayList<>(); while(c.moveToNext()) { String name = c.getString(c.getColumnIndex(COL_NAME)); int rows = c.getInt(c.getColumnIndex(COL_ROWS)); int cols = c.getInt(c.getColumnIndex(COL_COLS)); int previewCount = c.getInt(c.getColumnIndex(COL_PREVIEW_COUNT)); boolean isSet = Boolean.parseBoolean(c.getString(c.getColumnIndex(COL_IS_DEFAULT))); String title = mContext.getString(R.string.grid_title_pattern, cols, rows); mOptions.add(new GridOption(title, name, isSet, rows, cols, mPreviewUtils.getUri(PREVIEW), previewCount, iconPath)); } } catch (Exception e) { mOptions = null; } return mOptions; } void updateView() { mLiveData.postValue(new Object()); } int applyGrid(String name) { ContentValues values = new ContentValues(); values.put("name", name); values.put("enable_apply_button", mIsGridApplyButtonEnabled); return mContext.getContentResolver().update(mPreviewUtils.getUri(DEFAULT_GRID), values, null, null); } /** * Returns an observable that receives a new value each time that the grid options are changed. * Do not call if {@link #areGridsAvailable()} returns false */ public LiveData getOptionChangeObservable( @Nullable Handler handler) { if (mLiveData == null) { mLiveData = new OptionChangeLiveData( mContext, mPreviewUtils.getUri(DEFAULT_GRID), handler); } return mLiveData; } private static class OptionChangeLiveData extends MutableLiveData { private final ContentResolver mContentResolver; private final Uri mUri; private final ContentObserver mContentObserver; OptionChangeLiveData( Context context, Uri uri, @Nullable Handler handler) { mContentResolver = context.getContentResolver(); mUri = uri; mContentObserver = new ContentObserver(handler) { @Override public void onChange(boolean selfChange) { // If grid apply button is enabled, user has previewed the grid before applying // the grid change. Thus there is no need to preview again (which will cause a // blank preview as launcher's is loader thread is busy reloading workspace) // after applying grid change. Thus we should ignore ContentObserver#onChange // from launcher if (BaseFlags.get().isGridApplyButtonEnabled(context.getApplicationContext())) { return; } postValue(new Object()); } }; } @Override protected void onActive() { mContentResolver.registerContentObserver( mUri, /* notifyForDescendants= */ true, mContentObserver); } @Override protected void onInactive() { mContentResolver.unregisterContentObserver(mContentObserver); } } }