| /* |
| * Copyright (C) 2014 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.printspooler.ui; |
| |
| import android.annotation.Nullable; |
| import android.app.Activity; |
| import android.app.LoaderManager.LoaderCallbacks; |
| import android.content.Loader; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.print.PrinterId; |
| import android.print.PrinterInfo; |
| import com.android.internal.os.SomeArgs; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class PrinterRegistry { |
| |
| private final int mLoaderId; |
| |
| private final Activity mActivity; |
| |
| private final List<PrinterInfo> mPrinters = new ArrayList<>(); |
| |
| private final Runnable mReadyCallback; |
| |
| private final Handler mHandler; |
| |
| private boolean mReady; |
| |
| private OnPrintersChangeListener mOnPrintersChangeListener; |
| |
| public interface OnPrintersChangeListener { |
| public void onPrintersChanged(List<PrinterInfo> printers); |
| public void onPrintersInvalid(); |
| } |
| |
| public PrinterRegistry(Activity activity, Runnable readyCallback, int loaderId, |
| int internalLoaderId) { |
| mLoaderId = loaderId; |
| mActivity = activity; |
| mReadyCallback = readyCallback; |
| mHandler = new MyHandler(activity.getMainLooper()); |
| |
| Bundle loaderData = new Bundle(1); |
| loaderData.putInt(null, internalLoaderId); |
| |
| activity.getLoaderManager().initLoader(loaderId, loaderData, mLoaderCallbacks); |
| } |
| |
| public void setOnPrintersChangeListener(OnPrintersChangeListener listener) { |
| mOnPrintersChangeListener = listener; |
| } |
| |
| public List<PrinterInfo> getPrinters() { |
| return mPrinters; |
| } |
| |
| public void addHistoricalPrinter(PrinterInfo printer) { |
| FusedPrintersProvider provider = getPrinterProvider(); |
| if (provider != null) { |
| getPrinterProvider().addHistoricalPrinter(printer); |
| } |
| } |
| |
| public void forgetFavoritePrinter(PrinterId printerId) { |
| FusedPrintersProvider provider = getPrinterProvider(); |
| if (provider != null) { |
| provider.forgetFavoritePrinter(printerId); |
| } |
| } |
| |
| public boolean isFavoritePrinter(PrinterId printerId) { |
| FusedPrintersProvider provider = getPrinterProvider(); |
| if (provider != null) { |
| return provider.isFavoritePrinter(printerId); |
| } |
| return false; |
| } |
| |
| public void setTrackedPrinter(@Nullable PrinterId printerId) { |
| FusedPrintersProvider provider = getPrinterProvider(); |
| if (provider != null) { |
| provider.setTrackedPrinter(printerId); |
| } |
| } |
| |
| public boolean areHistoricalPrintersLoaded() { |
| FusedPrintersProvider provider = getPrinterProvider(); |
| if (provider != null) { |
| return getPrinterProvider().areHistoricalPrintersLoaded(); |
| } |
| return false; |
| } |
| |
| private FusedPrintersProvider getPrinterProvider() { |
| Loader<?> loader = mActivity.getLoaderManager().getLoader(mLoaderId); |
| return (FusedPrintersProvider) loader; |
| } |
| |
| private final LoaderCallbacks<List<PrinterInfo>> mLoaderCallbacks = |
| new LoaderCallbacks<List<PrinterInfo>>() { |
| @Override |
| public void onLoaderReset(Loader<List<PrinterInfo>> loader) { |
| mPrinters.clear(); |
| |
| // Post a message as we are in onLoadFinished and certain operations |
| // are not allowed in this callback, such as fragment transactions. |
| // Clients should not handle this explicitly. |
| mHandler.obtainMessage(MyHandler.MSG_PRINTERS_INVALID).sendToTarget(); |
| } |
| |
| // LoaderCallbacks#onLoadFinished |
| @Override |
| public void onLoadFinished(Loader<List<PrinterInfo>> loader, List<PrinterInfo> printers) { |
| mPrinters.clear(); |
| mPrinters.addAll(printers); |
| |
| // Post a message as we are in onLoadFinished and certain operations |
| // are not allowed in this callback, such as fragment transactions. |
| // Clients should not handle this explicitly. |
| mHandler.obtainMessage(MyHandler.MSG_PRINTERS_CHANGED, printers).sendToTarget(); |
| |
| if (!mReady) { |
| mReady = true; |
| if (mReadyCallback != null) { |
| mReadyCallback.run(); |
| } |
| } |
| } |
| |
| // LoaderCallbacks#onCreateLoader |
| @Override |
| public Loader<List<PrinterInfo>> onCreateLoader(int id, Bundle args) { |
| return new FusedPrintersProvider(mActivity, args.getInt(null)); |
| } |
| }; |
| |
| private final class MyHandler extends Handler { |
| public static final int MSG_PRINTERS_CHANGED = 0; |
| public static final int MSG_PRINTERS_INVALID = 1; |
| |
| public MyHandler(Looper looper) { |
| super(looper, null , false); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void handleMessage(Message message) { |
| switch (message.what) { |
| case MSG_PRINTERS_CHANGED: { |
| List<PrinterInfo> printers = (List<PrinterInfo>) message.obj; |
| |
| if (mOnPrintersChangeListener != null) { |
| mOnPrintersChangeListener.onPrintersChanged(printers); |
| } |
| } break; |
| |
| case MSG_PRINTERS_INVALID: { |
| if (mOnPrintersChangeListener != null) { |
| mOnPrintersChangeListener.onPrintersInvalid(); |
| } |
| } break; |
| } |
| } |
| } |
| } |