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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.messaging.ui.mediapicker;
     18 
     19 import android.content.Context;
     20 import android.content.res.Configuration;
     21 import android.hardware.Camera;
     22 import android.view.View;
     23 import android.view.View.MeasureSpec;
     24 import com.android.messaging.util.Assert;
     25 
     26 import java.io.IOException;
     27 
     28 /**
     29  * Contains shared code for SoftwareCameraPreview and HardwareCameraPreview, cannot use inheritance
     30  * because those classes must inherit from separate Views, so those classes delegate calls to this
     31  * helper class.  Specifics for each implementation are in CameraPreviewHost
     32  */
     33 public class CameraPreview {
     34     public interface CameraPreviewHost {
     35         View getView();
     36         boolean isValid();
     37         void startPreview(final Camera camera) throws IOException;
     38         void onCameraPermissionGranted();
     39 
     40     }
     41 
     42     private int mCameraWidth = -1;
     43     private int mCameraHeight = -1;
     44 
     45     private final CameraPreviewHost mHost;
     46 
     47     public CameraPreview(final CameraPreviewHost host) {
     48         Assert.notNull(host);
     49         Assert.notNull(host.getView());
     50         mHost = host;
     51     }
     52 
     53     public void setSize(final Camera.Size size, final int orientation) {
     54         switch (orientation) {
     55             case 0:
     56             case 180:
     57                 mCameraWidth = size.width;
     58                 mCameraHeight = size.height;
     59                 break;
     60             case 90:
     61             case 270:
     62             default:
     63                 mCameraWidth = size.height;
     64                 mCameraHeight = size.width;
     65         }
     66         mHost.getView().requestLayout();
     67     }
     68 
     69     public int getWidthMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
     70         if (mCameraHeight >= 0) {
     71             final int width = View.MeasureSpec.getSize(widthMeasureSpec);
     72             return MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
     73         } else {
     74             return widthMeasureSpec;
     75         }
     76     }
     77 
     78     public int getHeightMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
     79         if (mCameraHeight >= 0) {
     80             final int orientation = getContext().getResources().getConfiguration().orientation;
     81             final int width = View.MeasureSpec.getSize(widthMeasureSpec);
     82             final float aspectRatio = (float) mCameraWidth / (float) mCameraHeight;
     83             int height;
     84             if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
     85                 height = (int) (width * aspectRatio);
     86             } else {
     87                 height = (int) (width / aspectRatio);
     88             }
     89             return View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
     90         } else {
     91             return heightMeasureSpec;
     92         }
     93     }
     94 
     95     public void onVisibilityChanged(final int visibility) {
     96         if (CameraManager.hasCameraPermission()) {
     97             if (visibility == View.VISIBLE) {
     98                 CameraManager.get().openCamera();
     99             } else {
    100                 CameraManager.get().closeCamera();
    101             }
    102         }
    103     }
    104 
    105     public Context getContext() {
    106         return mHost.getView().getContext();
    107     }
    108 
    109     public void setOnTouchListener(final View.OnTouchListener listener) {
    110         mHost.getView().setOnTouchListener(listener);
    111     }
    112 
    113     public int getHeight() {
    114         return mHost.getView().getHeight();
    115     }
    116 
    117     public void onAttachedToWindow() {
    118         if (CameraManager.hasCameraPermission()) {
    119             CameraManager.get().openCamera();
    120         }
    121     }
    122 
    123     public void onDetachedFromWindow() {
    124         CameraManager.get().closeCamera();
    125     }
    126 
    127     public void onRestoreInstanceState() {
    128         if (CameraManager.hasCameraPermission()) {
    129             CameraManager.get().openCamera();
    130         }
    131     }
    132 
    133     public void onCameraPermissionGranted() {
    134         CameraManager.get().openCamera();
    135     }
    136 
    137     /**
    138      * @return True if the view is valid and prepared for the camera to start showing the preview
    139      */
    140     public boolean isValid() {
    141         return mHost.isValid();
    142     }
    143 
    144     /**
    145      * Starts the camera preview on the current surface.  Abstracts out the differences in API
    146      * from the CameraManager
    147      * @throws IOException Which is caught by the CameraManager to display an error
    148      */
    149     public void startPreview(final Camera camera) throws IOException {
    150         mHost.startPreview(camera);
    151     }
    152 }
    153