/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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.
*/
using System;
namespace Tizen.Sensor
{
///
/// LightSensor Class. Used for registering callbacks for light sensor and getting light data
///
public sealed class LightSensor : Sensor
{
private const string LightSensorKey = "http://tizen.org/feature/sensor.photometer";
///
/// Gets the Level of the light.
///
/// 3
/// Light level
public float Level { get; private set; } = float.MinValue;
///
/// Returns true or false based on whether light sensor is supported by device.
///
/// 3
/// true if supported; otherwise, false.
public static bool IsSupported
{
get
{
Log.Info(Globals.LogTag, "Checking if the LightSensor is supported");
return CheckIfSupported(SensorType.LightSensor, LightSensorKey);
}
}
///
/// Returns the number of light sensors available on the device.
///
/// 3
/// The count of light sensors
public static int Count
{
get
{
Log.Info(Globals.LogTag, "Getting the count of light sensors");
return GetCount();
}
}
///
/// Initializes a new instance of the class.
///
/// 3
/// http://tizen.org/feature/sensor.photometer
/// Thrown when an invalid argument is used
/// Thrown when the sensor is not supported
/// Thrown when the operation is invalid for the current state
///
/// Index. Default value for this is 0. Index refers to a particular light sensor in case of multiple sensors
///
public LightSensor(uint index = 0) : base(index)
{
Log.Info(Globals.LogTag, "Creating LightSensor object");
}
internal override SensorType GetSensorType()
{
return SensorType.LightSensor;
}
///
/// Event Handler for storing the callback functions for event corresponding to change in light sensor data.
///
/// 3
public event EventHandler DataUpdated;
private static int GetCount()
{
IntPtr list;
int count;
int error = Interop.SensorManager.GetSensorList(SensorType.LightSensor, out list, out count);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error getting sensor list for light");
count = 0;
}
else
Interop.Libc.Free(list);
return count;
}
private static Interop.SensorListener.SensorEventCallback _callback;
internal override void EventListenStart()
{
_callback = (IntPtr sensorHandle, IntPtr eventPtr, IntPtr data) => {
Interop.SensorEventStruct sensorData = Interop.IntPtrToEventStruct(eventPtr);
TimeSpan = new TimeSpan((Int64)sensorData.timestamp);
Level = sensorData.values[0];
DataUpdated?.Invoke(this, new LightSensorDataUpdatedEventArgs(sensorData.values[0]));
};
int error = Interop.SensorListener.SetEventCallback(ListenerHandle, Interval, _callback, IntPtr.Zero);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error setting event callback for light sensor");
throw SensorErrorFactory.CheckAndThrowException(error, "Unable to set event callback for light");
}
}
internal override void EventListenStop()
{
int error = Interop.SensorListener.UnsetEventCallback(ListenerHandle);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error unsetting event callback for light sensor");
throw SensorErrorFactory.CheckAndThrowException(error, "Unable to unset event callback for light");
}
}
}
}