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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.settings;
     18 
     19 import com.android.camera.app.AppController;
     20 import com.android.camera.CameraActivity;
     21 import com.android.camera.one.OneCamera;
     22 import com.android.camera2.R;
     23 
     24 import android.content.res.Resources;
     25 
     26 /**
     27  * Handles the camera facing setting for a particular scope stored in
     28  * SharedPreferences keyed by Keys.KEY_CAMERA_ID.
     29  */
     30 public class CameraFacingSetting {
     31     private final SettingsManager mSettingsManager;
     32 
     33     private final String mSettingScope;
     34 
     35     private final String mCameraFacingSettingKey;
     36 
     37     private final int mCameraFacingBackValue;
     38     private final int mCameraFacingFrontValue;
     39     private final int mCameraFacingDefaultValue;
     40 
     41     public CameraFacingSetting(
     42             Resources resources,
     43             SettingsManager settingsManager,
     44             String moduleSettingScope,
     45             AppController appController) {
     46         mSettingsManager = settingsManager;
     47 
     48         mSettingScope = SettingsManager.getModuleSettingScope(moduleSettingScope);
     49 
     50         mCameraFacingSettingKey = Keys.KEY_CAMERA_ID;
     51         mCameraFacingDefaultValue =
     52                 Integer.parseInt(resources.getString(R.string.pref_camera_id_default));
     53 
     54         if (appController.getCameraProvider().getCharacteristics(mCameraFacingDefaultValue).
     55                 isFacingFront()) {
     56             mCameraFacingFrontValue = 0;
     57             mCameraFacingBackValue = 1;
     58         } else {
     59             mCameraFacingBackValue = 0;
     60             mCameraFacingFrontValue = 1;
     61         }
     62     }
     63 
     64     @Override
     65     public String toString() {
     66         return isFacingBack() ? "Back Camera" : "Front Camera";
     67     }
     68 
     69     /**
     70      * Sets the default value for the camera facing setting.
     71      */
     72     public void setDefault() {
     73         mSettingsManager.setDefaults(
     74                 Keys.KEY_CAMERA_ID,
     75                 mCameraFacingDefaultValue,
     76                 new int[]{mCameraFacingBackValue, mCameraFacingFrontValue});
     77     }
     78 
     79     /**
     80      * Whether the back camera should be opened.
     81      *
     82      * @return Whether the back camera should be opened.
     83      */
     84     public boolean isFacingBack() {
     85         return getCameraFacing() == OneCamera.Facing.BACK;
     86     }
     87 
     88     /**
     89      * Whether the front camera should be opened.
     90      *
     91      * @return Whether the front camera should be opened.
     92      */
     93     public boolean isFacingFront() {
     94         return getCameraFacing() == OneCamera.Facing.FRONT;
     95     }
     96 
     97     /**
     98      * Gets the current camera facing in the setting.
     99      *
    100      * @return The current camera facing in the setting.
    101      */
    102     public OneCamera.Facing getCameraFacing() {
    103         final int cameraId = mSettingsManager.getInteger(mSettingScope, mCameraFacingSettingKey);
    104         if (cameraId == mCameraFacingBackValue) {
    105             return OneCamera.Facing.BACK;
    106         } else if (cameraId == mCameraFacingFrontValue) {
    107             return OneCamera.Facing.FRONT;
    108         } else {
    109             return getDefaultCameraFacing();
    110         }
    111     }
    112 
    113     /**
    114      * Sets the camera facing setting.
    115      *
    116      * @param cameraFacing The new camera facing.
    117      */
    118     public void setCameraFacing(OneCamera.Facing cameraFacing) {
    119         final int cameraId = (cameraFacing == OneCamera.Facing.BACK) ?
    120                 mCameraFacingBackValue : mCameraFacingFrontValue;
    121         mSettingsManager.set(mSettingScope, mCameraFacingSettingKey, cameraId);
    122     }
    123 
    124     /**
    125      * Changes the camera facing setting to the other side.
    126      *
    127      * @return The new camera facing.
    128      */
    129     public OneCamera.Facing switchCameraFacing() {
    130         final OneCamera.Facing originalFacing = getCameraFacing();
    131         final OneCamera.Facing newFacing = (originalFacing == OneCamera.Facing.BACK) ?
    132                 OneCamera.Facing.FRONT : OneCamera.Facing.BACK;
    133         setCameraFacing(newFacing);
    134         return newFacing;
    135     }
    136 
    137     private OneCamera.Facing getDefaultCameraFacing() {
    138         if (mCameraFacingDefaultValue == mCameraFacingBackValue) {
    139             return OneCamera.Facing.BACK;
    140         } else {
    141             return OneCamera.Facing.FRONT;
    142         }
    143     }
    144 }
    145