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using System;
using System.Collections;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;
namespace Notifications.Wpf.Controls
{
public class NotificationArea : Control
{
public NotificationPosition Position
{
get { return (NotificationPosition)GetValue(PositionProperty); }
set { SetValue(PositionProperty, value); }
}
// Using a DependencyProperty as the backing store for Position. This enables animation, styling, binding, etc...
public static readonly DependencyProperty PositionProperty =
DependencyProperty.Register("Position", typeof(NotificationPosition), typeof(NotificationArea), new PropertyMetadata(NotificationPosition.BottomRight));
public int MaxItems
{
get { return (int)GetValue(MaxItemsProperty); }
set { SetValue(MaxItemsProperty, value); }
}
public static readonly DependencyProperty MaxItemsProperty =
DependencyProperty.Register("MaxItems", typeof(int), typeof(NotificationArea), new PropertyMetadata(int.MaxValue));
private IList _items;
public NotificationArea()
{
NotificationManager.AddArea(this);
}
static NotificationArea()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(NotificationArea),
new FrameworkPropertyMetadata(typeof(NotificationArea)));
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
var itemsControl = GetTemplateChild("PART_Items") as Panel;
_items = itemsControl?.Children;
}
#if NET40
public void Show(object content, TimeSpan expirationTime, Action onClick, Action onClose)
#else
public async void Show(object content, TimeSpan expirationTime, Action onClick, Action onClose)
#endif
{
var notification = new Notification
{
Content = content
};
notification.MouseLeftButtonDown += (sender, args) =>
{
if (onClick != null)
{
onClick.Invoke();
(sender as Notification)?.Close();
}
};
notification.NotificationClosed += (sender, args) => onClose?.Invoke();
notification.NotificationClosed += OnNotificationClosed;
if (!IsLoaded)
{
return;
}
var w = Window.GetWindow(this);
var x = PresentationSource.FromVisual(w);
if (x == null)
{
return;
}
lock (_items)
{
_items.Add(notification);
if (_items.OfType<Notification>().Count(i => !i.IsClosing) > MaxItems)
{
_items.OfType<Notification>().First(i => !i.IsClosing).Close();
}
}
#if NET40
DelayExecute(expirationTime, () =>
{
#else
if (expirationTime == TimeSpan.MaxValue)
{
return;
}
await Task.Delay(expirationTime);
#endif
notification.Close();
#if NET40
});
#endif
}
private void OnNotificationClosed(object sender, RoutedEventArgs routedEventArgs)
{
var notification = sender as Notification;
_items.Remove(notification);
}
#if NET40
private static void DelayExecute(TimeSpan delay, Action actionToExecute)
{
if (actionToExecute != null)
{
var timer = new DispatcherTimer
{
Interval = delay
};
timer.Tick += (sender, args) =>
{
timer.Stop();
actionToExecute();
};
timer.Start();
}
}
#endif
}
public enum NotificationPosition
{
TopLeft,
TopRight,
BottomLeft,
BottomRight
}
}
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