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AccessibleUtil.cs
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AccessibleUtil.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;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
namespace ElmSharp.Accessible
{
/// <summary>
/// Enumeration for the ReadingStatus.
/// </summary>
/// <since_tizen> preview </since_tizen>
public enum ReadingStatus
{
/// <summary>
/// Unknown status.
/// </summary>
Unknown,
/// <summary>
/// Cancelled status.
/// </summary>
Cancelled,
/// <summary>
/// Stopped status.
/// </summary>
Stoppped,
/// <summary>
/// Skipped status.
/// </summary>
Skipped
}
/// <summary>
/// AccessibleUtil provides a method to set the reading information.
/// </summary>
/// <since_tizen> preview </since_tizen>
public static class AccessibleUtil
{
static void AtspiSignalCallback(IntPtr data, string say_signal)
{
GCHandle gch = GCHandle.FromIntPtr(data);
TaskCompletionSource<ReadingStatus> tcs = (TaskCompletionSource<ReadingStatus>) gch.Target;
if (say_signal.Equals("ReadingCancelled"))
{
tcs.SetResult(ReadingStatus.Cancelled);
}
else if (say_signal.Equals("ReadingStopped"))
{
tcs.SetResult(ReadingStatus.Stoppped);
}
else if (say_signal.Equals("ReadingSkipped"))
{
tcs.SetResult(ReadingStatus.Skipped);
}
else
{
tcs.SetException(new InvalidOperationException("unknown signal : " + say_signal));
}
gch.Free();
}
/// <summary>
/// Reads the given text by a screen reader.
/// </summary>
/// <param name="text">The reading text.</param>
/// <param name="discardable">If true, reading can be discarded by subsequent reading requests. If false, reading must be finished before the next reading request can be started.</param>
/// <returns>Return a task with the reading status.</returns>
/// <since_tizen> preview </since_tizen>
public static Task<ReadingStatus> Say(string text, bool discardable)
{
var tcs = new TaskCompletionSource<ReadingStatus>();
GCHandle gch = GCHandle.Alloc(tcs);
Interop.Elementary.elm_atspi_bridge_utils_say(text, discardable, AtspiSignalCallback, GCHandle.ToIntPtr(gch));
return tcs.Task;
}
}
}