+/*
+ * Copyright (C) 2010 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.google.zxing.client.android.camera;
+
+import android.hardware.Camera;
+import android.os.Handler;
+import android.os.Message;
+
+final class AutoFocusCallback implements Camera.AutoFocusCallback {
+
+ private static final long AUTOFOCUS_INTERVAL_MS = 1500L;
+
+ private final CameraConfigurationManager configManager;
+ private boolean reinitCamera;
+ private Handler autoFocusHandler;
+ private int autoFocusMessage;
+
+ AutoFocusCallback(CameraConfigurationManager configManager) {
+ this.configManager = configManager;
+ }
+
+ void setHandler(Handler autoFocusHandler, int autoFocusMessage) {
+ this.autoFocusHandler = autoFocusHandler;
+ this.autoFocusMessage = autoFocusMessage;
+ }
+
+ public void onAutoFocus(boolean success, Camera camera) {
+ if (autoFocusHandler != null) {
+ Message message = autoFocusHandler.obtainMessage(autoFocusMessage, success);
+ // Simulate continuous autofocus by sending a focus request every
+ // AUTOFOCUS_INTERVAL_MS milliseconds.
+ autoFocusHandler.sendMessageDelayed(message, AUTOFOCUS_INTERVAL_MS);
+ autoFocusHandler = null;
+ if (!reinitCamera) {
+ reinitCamera = true;
+ configManager.setDesiredCameraParameters(camera);
+ }
+ }
+ }
+
+}