| /* |
| * 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.systemui.accessibility; |
| |
| import android.content.Context; |
| import android.content.pm.ActivityInfo; |
| import android.content.res.Configuration; |
| import android.database.ContentObserver; |
| import android.os.Handler; |
| import android.provider.Settings; |
| |
| import com.android.systemui.SystemUI; |
| import com.android.systemui.dagger.qualifiers.Main; |
| |
| import javax.inject.Inject; |
| import javax.inject.Singleton; |
| |
| /** |
| * Class to handle changes to setting window_magnification value. |
| */ |
| @Singleton |
| public class WindowMagnification extends SystemUI { |
| private WindowMagnificationController mWindowMagnificationController; |
| private final Handler mHandler; |
| |
| private Configuration mLastConfiguration; |
| |
| @Inject |
| public WindowMagnification(Context context, @Main Handler mainHandler) { |
| super(context); |
| mHandler = mainHandler; |
| mLastConfiguration = new Configuration(context.getResources().getConfiguration()); |
| } |
| |
| @Override |
| public void onConfigurationChanged(Configuration newConfig) { |
| final int configDiff = newConfig.diff(mLastConfiguration); |
| if ((configDiff & ActivityInfo.CONFIG_DENSITY) == 0) { |
| return; |
| } |
| mLastConfiguration.setTo(newConfig); |
| if (mWindowMagnificationController != null) { |
| mWindowMagnificationController.onConfigurationChanged(configDiff); |
| } |
| } |
| |
| @Override |
| public void start() { |
| mContext.getContentResolver().registerContentObserver( |
| Settings.Secure.getUriFor(Settings.Secure.WINDOW_MAGNIFICATION), |
| true, new ContentObserver(mHandler) { |
| @Override |
| public void onChange(boolean selfChange) { |
| updateWindowMagnification(); |
| } |
| }); |
| } |
| |
| private void updateWindowMagnification() { |
| try { |
| boolean enable = Settings.Secure.getInt(mContext.getContentResolver(), |
| Settings.Secure.WINDOW_MAGNIFICATION) != 0; |
| if (enable) { |
| enableMagnification(); |
| } else { |
| disableMagnification(); |
| } |
| } catch (Settings.SettingNotFoundException e) { |
| disableMagnification(); |
| } |
| } |
| |
| private void enableMagnification() { |
| if (mWindowMagnificationController == null) { |
| mWindowMagnificationController = new WindowMagnificationController(mContext, null); |
| } |
| mWindowMagnificationController.createWindowMagnification(); |
| } |
| |
| private void disableMagnification() { |
| if (mWindowMagnificationController != null) { |
| mWindowMagnificationController.deleteWindowMagnification(); |
| } |
| mWindowMagnificationController = null; |
| } |
| } |