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.content.Context;
  import android.util.Log;
  import android.util.SparseIntArray;
  import android.view.Display;
  import android.view.OrientationEventListener;
  import android.view.Surface;
  
  
  /**
   * Monitors the value returned from {@link Display#getRotation()}.
   */
  abstract class DisplayOrientationDetector {
  
      private final OrientationEventListener mOrientationEventListener;
  
      /**
       * Mapping from Surface.Rotation_n to degrees.
       */
      static final SparseIntArray DISPLAY_ORIENTATIONS = new SparseIntArray();
  
      static {
          DISPLAY_ORIENTATIONS.put(Surface.ROTATION_0, 0);
          DISPLAY_ORIENTATIONS.put(Surface.ROTATION_90, 90);
          DISPLAY_ORIENTATIONS.put(Surface.ROTATION_180, 180);
          DISPLAY_ORIENTATIONS.put(Surface.ROTATION_270, 270);
      }
  
      Display mDisplay;
  
      private int mLastKnownDisplayOrientation = 0;
  
      public DisplayOrientationDetector(Context context) {
          mOrientationEventListener = new OrientationEventListener(context) {
  
              /** This is either Surface.Rotation_0, _90, _180, _270, or -1 (invalid). */
              private int mLastKnownRotation = -1;
  
              @Override
              public void onOrientationChanged(int orientation) {
                  if (orientation == OrientationEventListener.ORIENTATION_UNKNOWN ||
                          mDisplay == null) {
                      return;
                  }
                  final int rotation = mDisplay.getRotation();
                  if (mLastKnownRotation != rotation) {
                      mLastKnownRotation = rotation;
                      dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(rotation));
                  }
              }
          };
      }
  
      public void enable(Display display) {
          mDisplay = display;
          mOrientationEventListener.enable();
          // Immediately dispatch the first callback
          dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(display.getRotation()));
      }
  
      public void disable() {
          mOrientationEventListener.disable();
          mDisplay = null;
      }
  
      public int getLastKnownDisplayOrientation() {
          return mLastKnownDisplayOrientation;
      }
  
      void dispatchOnDisplayOrientationChanged(int displayOrientation) {
          mLastKnownDisplayOrientation = displayOrientation;
          onDisplayOrientationChanged(displayOrientation);
      }
  
      public boolean isVertical() {
          return mLastKnownDisplayOrientation % 180 != 0;
      }
  
      public boolean isHorizontal() {
          return mLastKnownDisplayOrientation % 180 == 0;
      }
  
      /**
       * Called when display orientation is changed.
       *
       * @param displayOrientation One of 0, 90, 180, and 270.
       */
  
  
      public abstract void onDisplayOrientationChanged(int displayOrientation);
  
      private boolean isVisiable = true;
  
      public void isVisiable(boolean isVisiable) {
          this.isVisiable = isVisiable;
      }
  
  }
  