content: /*
   * Copyright (C) 2012 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.amnesica.kryptey.inputmethod.latin;
  
  import android.content.Context;
  import android.media.AudioManager;
  import android.os.Vibrator;
  import android.view.HapticFeedbackConstants;
  import android.view.View;
  
  import com.amnesica.kryptey.inputmethod.latin.common.Constants;
  import com.amnesica.kryptey.inputmethod.latin.settings.SettingsValues;
  
  /**
   * This class gathers audio feedback and haptic feedback functions.
   * <p>
   * It offers a consistent and simple interface that allows LatinIME to forget about the
   * complexity of settings and the like.
   */
  public final class AudioAndHapticFeedbackManager {
    private AudioManager mAudioManager;
    private Vibrator mVibrator;
  
    private SettingsValues mSettingsValues;
    private boolean mSoundOn;
  
    private static final AudioAndHapticFeedbackManager sInstance =
        new AudioAndHapticFeedbackManager();
  
    public static AudioAndHapticFeedbackManager getInstance() {
      return sInstance;
    }
  
    private AudioAndHapticFeedbackManager() {
      // Intentional empty constructor for singleton.
    }
  
    public static void init(final Context context) {
      sInstance.initInternal(context);
    }
  
    private void initInternal(final Context context) {
      mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
      mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
    }
  
    public boolean hasVibrator() {
      return mVibrator != null && mVibrator.hasVibrator();
    }
  
    public void vibrate(final long milliseconds) {
      if (mVibrator == null) {
        return;
      }
      mVibrator.vibrate(milliseconds);
    }
  
    private boolean reevaluateIfSoundIsOn() {
      if (mSettingsValues == null || !mSettingsValues.mSoundOn || mAudioManager == null) {
        return false;
      }
      return mAudioManager.getRingerMode() == AudioManager.RINGER_MODE_NORMAL;
    }
  
    public void performAudioFeedback(final int code) {
      // if mAudioManager is null, we can't play a sound anyway, so return
      if (mAudioManager == null) {
        return;
      }
      if (!mSoundOn) {
        return;
      }
      final int sound;
      switch (code) {
        case Constants.CODE_DELETE:
          sound = AudioManager.FX_KEYPRESS_DELETE;
          break;
        case Constants.CODE_ENTER:
          sound = AudioManager.FX_KEYPRESS_RETURN;
          break;
        case Constants.CODE_SPACE:
          sound = AudioManager.FX_KEYPRESS_SPACEBAR;
          break;
        default:
          sound = AudioManager.FX_KEYPRESS_STANDARD;
          break;
      }
      mAudioManager.playSoundEffect(sound, mSettingsValues.mKeypressSoundVolume);
    }
  
    public void performHapticFeedback(final View viewToPerformHapticFeedbackOn) {
      if (!mSettingsValues.mVibrateOn) {
        return;
      }
      if (mSettingsValues.mKeypressVibrationDuration >= 0) {
        vibrate(mSettingsValues.mKeypressVibrationDuration);
        return;
      }
      // Go ahead with the system default
      if (viewToPerformHapticFeedbackOn != null) {
        viewToPerformHapticFeedbackOn.performHapticFeedback(
            HapticFeedbackConstants.KEYBOARD_TAP,
            HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING);
      }
    }
  
    public void onSettingsChanged(final SettingsValues settingsValues) {
      mSettingsValues = settingsValues;
      mSoundOn = reevaluateIfSoundIsOn();
    }
  
    public void onRingerModeChanged() {
      mSoundOn = reevaluateIfSoundIsOn();
    }
  }
  