/
FaceDownGestureDetector.cs
executable file
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/
FaceDownGestureDetector.cs
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/*
* 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
{
/// <summary>
/// The FaceDownGestureDetector class is used for registering callbacks for the face down gesture detector and getting the face down state.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public sealed class FaceDownGestureDetector : Sensor
{
private static string GestureDetectorKey = "http://tizen.org/feature/sensor.gesture_recognition";
/// <summary>
/// Gets the state of the face down gesture.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <value> The face down state. </value>
public DetectorState FaceDown { get; private set; } = DetectorState.Unknown;
/// <summary>
/// Returns true or false based on whether the face down gesture detector is supported by the device.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <value><c>true</c> if supported; otherwise <c>false</c>.</value>
public static bool IsSupported
{
get
{
Log.Info(Globals.LogTag, "Checking if the face down gesture detector is supported");
return CheckIfSupported(SensorType.FaceDownGestureDetector, GestureDetectorKey);
}
}
/// <summary>
/// Returns the number of face down gesture detectors available on the device.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <value> The count of face down gesture detectors. </value>
public static int Count
{
get
{
Log.Info(Globals.LogTag, "Getting the count of face down gesture detectors");
return GetCount();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Tizen.Sensor.FaceDownGestureDetector"/> class.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <feature>http://tizen.org/feature/sensor.gesture_recognition</feature>
/// <exception cref="ArgumentException">Thrown when an invalid argument is used.</exception>
/// <exception cref="NotSupportedException">Thrown when the sensor is not supported.</exception>
/// <exception cref="InvalidOperationException">Thrown when the operation is invalid for the current state.</exception>
/// <param name='index'>
/// Index. Default value for this is 0. Index refers to a particular face down gesture detector in case of multiple sensors.
/// </param>
public FaceDownGestureDetector(uint index = 0) : base(index)
{
Log.Info(Globals.LogTag, "Creating face down gesture detector object");
}
internal override SensorType GetSensorType()
{
return SensorType.FaceDownGestureDetector;
}
private static int GetCount()
{
IntPtr list;
int count;
int error = Interop.SensorManager.GetSensorList(SensorType.FaceDownGestureDetector, out list, out count);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error getting sensor list for face down gesture detector");
count = 0;
}
else
Interop.Libc.Free(list);
return count;
}
/// <summary>
/// Read face down gesture detector data synchronously.
/// </summary>
internal override void ReadData()
{
Interop.SensorEventStruct sensorData;
int error = Interop.SensorListener.ReadData(ListenerHandle, out sensorData);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error reading face down gesture detector data");
throw SensorErrorFactory.CheckAndThrowException(error, "Reading face down gesture detector data failed");
}
Timestamp = sensorData.timestamp;
FaceDown = (DetectorState)sensorData.values[0];
}
/// <summary>
/// An event handler for storing the callback functions for the event corresponding to the change in the face down gesture detector data.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public event EventHandler<FaceDownGestureDetectorDataUpdatedEventArgs> DataUpdated;
private static Interop.SensorListener.SensorEventsCallback _callback;
internal override void EventListenStart()
{
_callback = (IntPtr sensorHandle, IntPtr eventPtr, uint events_count, IntPtr data) => {
updateBatchEvents(eventPtr, events_count);
Interop.SensorEventStruct sensorData = latestEvent();
Timestamp = sensorData.timestamp;
FaceDown = (DetectorState) sensorData.values[0];
DataUpdated?.Invoke(this, new FaceDownGestureDetectorDataUpdatedEventArgs(sensorData.values[0]));
};
int error = Interop.SensorListener.SetEventsCallback(ListenerHandle, _callback, IntPtr.Zero);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error setting event callback for face down gesture detector");
throw SensorErrorFactory.CheckAndThrowException(error, "Unable to set event callback for face down gesture detector");
}
}
internal override void EventListenStop()
{
int error = Interop.SensorListener.UnsetEventsCallback(ListenerHandle);
if (error != (int)SensorError.None)
{
Log.Error(Globals.LogTag, "Error unsetting event callback for face down gesture detector");
throw SensorErrorFactory.CheckAndThrowException(error, "Unable to unset event callback for face down gesture detector");
}
}
}
}