content: /*
   * Copyright (C) 2016 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.google.android.cameraview;
  
  import android.os.Handler;
  import android.view.Surface;
  import android.view.SurfaceHolder;
  import android.view.View;
  
  
  /**
   * Encapsulates all the operations related to camera preview in a backward-compatible manner.
   */
  abstract class PreviewImpl {
  
      private Handler cameraHandler;
  
      interface Callback {
          void onSurfaceChanged();
      }
  
      private Callback mCallback;
  
      private volatile int mWidth;
  
      private volatile int mHeight;
  
      void setCallback(Callback callback) {
          mCallback = callback;
      }
  
      void setCameraHandle(Handler cameraHandle) {
          this.cameraHandler = cameraHandle;
      }
  
      abstract Surface getSurface();
  
      abstract View getView();
  
      abstract Class getOutputClass();
  
      abstract void setDisplayOrientation(int displayOrientation);
  
      abstract boolean isReady();
  
      protected void dispatchSurfaceChanged() {
          if (cameraHandler != null)
              cameraHandler.post(() -> mCallback.onSurfaceChanged());
          else mCallback.onSurfaceChanged();
      }
  
      SurfaceHolder getSurfaceHolder() {
          return null;
      }
  
      Object getSurfaceTexture() {
          return null;
      }
  
      void setBufferSize(int width, int height) {
      }
  
      void setSize(int width, int height) {
          mWidth = width;
          mHeight = height;
          View v = (View) getView().getParent();
          v.post(() -> {
              getView().setTranslationX(0);
              getView().setTranslationY(0);
              if (v == null)
                  return;
              if (width > v.getMeasuredWidth())
                  getView().setTranslationX((float) -(width - v.getMeasuredWidth()) / 2);
              if (height > v.getMeasuredHeight())
                  getView().setTranslationY((float) -(height - v.getMeasuredHeight()) / 2);
          });
          if (cameraHandler != null &&
                  cameraHandler.getLooper().getThread().getState() == Thread.State.TIMED_WAITING)
              cameraHandler.getLooper().getThread().interrupt();
  
      }
  
      int getWidth() {
          return mWidth;
      }
  
      int getHeight() {
          return mHeight;
      }
  
      /***
       * 同步比例
       * @param aspectRatio
       */
      public void updateAspectRatio(AspectRatio aspectRatio) {
          mWidth = 0;
          mHeight = 0;
          if (getView().getParent() instanceof CameraView) {
              ((CameraView) getView().getParent()).setAspectRatio(aspectRatio);
          }
      }
  }
  