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/*
* 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.Bundle;
import android.os.Handler;
import android.view.SurfaceView;
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.wallpaper.R;
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 List<GridOption> mOptions;
private OptionChangeLiveData mLiveData;
public LauncherGridOptionsProvider(Context context, String authorityMetadataKey) {
mPreviewUtils = new PreviewUtils(context, authorityMetadataKey);
mContext = context;
}
boolean areGridsAvailable() {
return mPreviewUtils.supportsPreview();
}
/**
* Retrieve the available grids.
* @param reload whether to reload grid options if they're cached.
*/
@WorkerThread
@Nullable
List<GridOption> 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;
}
/**
* Request rendering of home screen preview via Launcher to Wallpaper using SurfaceView
* @param name the grid option name
* @param bundle surface view request bundle generated from
* {@link com.android.wallpaper.util.SurfaceViewUtils#createSurfaceViewRequest(SurfaceView)}.
* @param callback To receive the result (will be called on the main thread)
*/
void renderPreview(String name, Bundle bundle,
PreviewUtils.WorkspacePreviewCallback callback) {
bundle.putString("name", name);
mPreviewUtils.renderPreview(bundle, callback);
}
int applyGrid(String name) {
ContentValues values = new ContentValues();
values.put("name", name);
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<Object> getOptionChangeObservable(
@Nullable Handler handler) {
if (mLiveData == null) {
mLiveData = new OptionChangeLiveData(
mContext, mPreviewUtils.getUri(DEFAULT_GRID), handler);
}
return mLiveData;
}
private static class OptionChangeLiveData extends MutableLiveData<Object> {
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) {
postValue(new Object());
}
};
}
@Override
protected void onActive() {
mContentResolver.registerContentObserver(
mUri,
/* notifyForDescendants= */ true,
mContentObserver);
}
@Override
protected void onInactive() {
mContentResolver.unregisterContentObserver(mContentObserver);
}
}
}
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