content: /*
   * Copyright (C) 2008 ZXing authors
   *
   * 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.handsome.didi.zxing.utils;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  
  import com.google.zxing.Result;
  import com.handsome.didi.R;
  import com.handsome.didi.zxing.activity.CaptureActivity;
  import com.handsome.didi.zxing.camera.CameraManager;
  import com.handsome.didi.zxing.decode.DecodeThread;
  
  /**
   * This class handles all the messaging which comprises the state machine for
   * capture.
   * 
   * @author dswitkin@google.com (Daniel Switkin)
   */
  public class CaptureActivityHandler extends Handler {
  
  	private final CaptureActivity activity;
  	private final DecodeThread decodeThread;
  	private final CameraManager cameraManager;
  	private State state;
  
  	private enum State {
  		PREVIEW, SUCCESS, DONE
  	}
  
  	public CaptureActivityHandler(CaptureActivity activity, CameraManager cameraManager, int decodeMode) {
  		this.activity = activity;
  		decodeThread = new DecodeThread(activity, decodeMode);
  		decodeThread.start();
  		state = State.SUCCESS;
  
  		// Start ourselves capturing previews and decoding.
  		this.cameraManager = cameraManager;
  		cameraManager.startPreview();
  		restartPreviewAndDecode();
  	}
  
  	@Override
  	public void handleMessage(Message message) {
  		switch (message.what) {
  		case R.id.restart_preview:
  			restartPreviewAndDecode();
  			break;
  		case R.id.decode_succeeded:
  			state = State.SUCCESS;
  			Bundle bundle = message.getData();
  
  			activity.handleDecode((Result) message.obj, bundle);
  			break;
  		case R.id.decode_failed:
  			// We're decoding as fast as possible, so when one decode fails,
  			// start another.
  			state = State.PREVIEW;
  			cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
  			break;
  		case R.id.return_scan_result:
  			activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
  			activity.finish();
  			break;
  		}
  	}
  
  	public void quitSynchronously() {
  		state = State.DONE;
  		cameraManager.stopPreview();
  		Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
  		quit.sendToTarget();
  		try {
  			// Wait at most half a second; should be enough time, and onPause()
  			// will timeout quickly
  			decodeThread.join(500L);
  		} catch (InterruptedException e) {
  			// continue
  		}
  
  		// Be absolutely sure we don't send any queued up messages
  		removeMessages(R.id.decode_succeeded);
  		removeMessages(R.id.decode_failed);
  	}
  
  	private void restartPreviewAndDecode() {
  		if (state == State.SUCCESS) {
  			state = State.PREVIEW;
  			cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
  		}
  	}
  
  }
  