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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using Tango.PPC.Common.Notifications;
using Tango.Core;
using System.Collections.Concurrent;
using System.Windows.Media.Imaging;
using Tango.SharedUI.Helpers;
namespace Tango.PPC.UI.Notifications
{
/// <summary>
/// Represents the default PPC notification provider.
/// </summary>
/// <seealso cref="Tango.Core.ExtendedObject" />
/// <seealso cref="Tango.PPC.Common.Notifications.INotificationProvider" />
public class DefaultNotificationProvider : ExtendedObject, INotificationProvider
{
/// <summary>
/// Represents a pending message box.
/// </summary>
private class PendingMessageBox
{
/// <summary>
/// Gets or sets the message view model.
/// </summary>
public MessageBoxVM VM { get; set; }
/// <summary>
/// Gets or sets the message task completion source.
/// </summary>
public TaskCompletionSource<bool> CompletionSource { get; set; }
}
private ConcurrentQueue<PendingMessageBox> _pendingMessageBoxes;
/// <summary>
/// Initializes a new instance of the <see cref="DefaultNotificationProvider"/> class.
/// </summary>
public DefaultNotificationProvider()
{
_pendingMessageBoxes = new ConcurrentQueue<PendingMessageBox>();
}
private MessageBoxVM _currentMessageBox;
/// <summary>
/// Gets the current message box if any.
/// </summary>
public MessageBoxVM CurrentMessageBox
{
get { return _currentMessageBox; }
private set
{
_currentMessageBox = value;
RaisePropertyChangedAuto();
RaisePropertyChanged(nameof(HasMessageBox));
}
}
/// <summary>
/// Gets a value indicating whether a message box is available.
/// </summary>
public bool HasMessageBox
{
get
{
return CurrentMessageBox != null;
}
}
/// <summary>
/// Shows an error message box.
/// </summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public Task ShowError(string message)
{
return ShowMessageBox(new MessageBoxVM()
{
Message = message,
Icon = ResourceHelper.GetImageFromResources("Images/MessageBox Icons/information.png"),
Title = "Error",
Brush = Application.Current.Resources["TangoMessageBoxErrorBrush"] as Brush,
});
}
/// <summary>
/// Shows an information message box.
/// </summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public Task ShowInfo(string message)
{
return ShowMessageBox(new MessageBoxVM()
{
Message = message,
Icon = ResourceHelper.GetImageFromResources("Images/MessageBox Icons/information.png"),
Title = "Information",
Brush = Application.Current.Resources["TangoMessageBoxInfoBrush"] as Brush,
});
}
/// <summary>
/// Shows warning message box.
/// </summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public Task ShowWarning(string message)
{
return ShowMessageBox(new MessageBoxVM()
{
Message = message,
Icon = ResourceHelper.GetImageFromResources("Images/MessageBox Icons/information.png"),
Title = "Warning",
Brush = Application.Current.Resources["TangoMessageBoxWarningBrush"] as Brush,
});
}
/// <summary>
/// Shows a question message box.
/// </summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public Task<bool> ShowQuestion(string message)
{
return ShowMessageBox(new MessageBoxVM()
{
Message = message,
Icon = ResourceHelper.GetImageFromResources("Images/MessageBox Icons/information.png"),
Title = "Confirm",
HasCancel = true,
Brush = Application.Current.Resources["TangoMessageBoxQuestionBrush"] as Brush,
});
}
/// <summary>
/// Shows the message box.
/// </summary>
/// <param name="vm">The view model.</param>
/// <returns></returns>
private Task<bool> ShowMessageBox(MessageBoxVM vm)
{
TaskCompletionSource<bool> source = new TaskCompletionSource<bool>();
vm.Accepted += () => { OnMessageBoxClosed(); source.SetResult(true); };
vm.Canceled += () => { OnMessageBoxClosed(); source.SetResult(false); };
if (CurrentMessageBox == null)
{
CurrentMessageBox = vm;
}
else
{
_pendingMessageBoxes.Enqueue(new PendingMessageBox()
{
VM = vm,
CompletionSource = source,
});
}
return source.Task;
}
/// <summary>
/// Called when the message box has been closed.
/// </summary>
private void OnMessageBoxClosed()
{
CurrentMessageBox = null;
if (_pendingMessageBoxes.Count > 0)
{
PendingMessageBox p = null;
if (_pendingMessageBoxes.TryDequeue(out p))
{
CurrentMessageBox = p.VM;
}
}
}
}
}
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