private async Task ShowAsync(Snackbar snackbar, SnackbarMessageQueueItem messageQueueItem, ManualResetEvent actionClickWaitHandle)
{
snackbar.Visibility = Visibility.Visible;
snackbar.SetCurrentValue(Snackbar.IsActiveProperty, false);
//create and show the message, setting up all the handles we need to wait on
var mouseNotOverManagedWaitHandle = CreateAndShowMessage(snackbar, messageQueueItem, actionClickWaitHandle);
var durationPassedWaitHandle = new ManualResetEvent(false);
StartDuration(messageQueueItem.Duration.Add(snackbar.ActivateStoryboardDuration), durationPassedWaitHandle);
//wait until time span completed (including pauses and mouse overs), or the action is clicked
await WaitForCompletionAsync(mouseNotOverManagedWaitHandle, durationPassedWaitHandle, actionClickWaitHandle);
//close message on snackbar
snackbar.SetCurrentValue(Snackbar.IsActiveProperty, false);
//we could wait for the animation event, but just doing
//this for now...at least it is prevent extra call back hell
await Task.Delay(snackbar.DeactivateStoryboardDuration);
//remove message on snackbar
snackbar.SetCurrentValue(Snackbar.MessageProperty, null);
mouseNotOverManagedWaitHandle.Dispose();
durationPassedWaitHandle.Dispose();
}
private static MouseNotOverManagedWaitHandle CreateAndShowMessage(UIElement snackbar,
SnackbarMessageQueueItem messageQueueItem, EventWaitHandle actionClickWaitHandle)
{
var clickCount = 0;
var snackbarMessage = new SnackbarMessage
{
Content = messageQueueItem.Content,
ActionContent = messageQueueItem.ActionContent
};
snackbarMessage.MouseDown += (sender, args) =>
{
//snackbar.Visibility = Visibility.Collapsed;
actionClickWaitHandle.Set();
};
snackbarMessage.ActionClick += (sender, args) =>
{
if (++clickCount == 1)
{
DoActionCallback(messageQueueItem);
}
actionClickWaitHandle.Set();
};
snackbar.SetCurrentValue(Snackbar.MessageProperty, snackbarMessage);
snackbar.SetCurrentValue(Snackbar.IsActiveProperty, true);
return(new MouseNotOverManagedWaitHandle(snackbar));
}
public void Enqueue(object content, object actionContent, Action <object> actionHandler,
object actionArgument, bool promote, bool neverConsiderToBeDuplicate)
{
if (content == null)
{
throw new ArgumentNullException(nameof(content));
}
if (actionContent == null ^ actionHandler == null)
{
throw new ArgumentException("All action arguments must be provided if any are provided.",
actionContent != null ? nameof(actionContent) : nameof(actionHandler));
}
var snackbarMessageQueueItem = new SnackbarMessageQueueItem(content, actionContent, actionHandler,
actionArgument, promote, neverConsiderToBeDuplicate);
if (promote)
{
InsertAsLastNotPromotedNode(snackbarMessageQueueItem);
}
else
{
_snackbarMessages.AddLast(snackbarMessageQueueItem);
}
_messageWaitingEvent.Set();
}
private void InsertItem(SnackbarMessageQueueItem item)
{
lock (_snackbarMessagesLock)
{
var added = false;
var node = _snackbarMessages.First;
while (node != null)
{
if (!IgnoreDuplicate && item.IsDuplicate(node.Value))
{
return;
}
if (item.IsPromoted && !node.Value.IsPromoted)
{
_snackbarMessages.AddBefore(node, item);
added = true;
break;
}
node = node.Next;
}
if (!added)
{
_snackbarMessages.AddLast(item);
}
}
_dispatcher.InvokeAsync(ShowNextAsync);
}
private static void DoActionCallback(SnackbarMessageQueueItem messageQueueItem)
{
try
{
var action = messageQueueItem.ActionHandler as Action;
if (action != null)
{
action();
return;
}
if (messageQueueItem.ArgumentType == null)
{
return;
}
var genericType = typeof(Action <>).MakeGenericType(messageQueueItem.ArgumentType);
var method = genericType.GetMethod("Invoke");
method.Invoke(messageQueueItem.ActionHandler, new[] { messageQueueItem.ActionArgument });
}
catch (Exception exc)
{
Trace.WriteLine("Error during SnackbarMessageQueue message action callback, exception will be rethrown.");
Trace.WriteLine($"{exc.Message} ({exc.GetType().FullName})");
Trace.WriteLine(exc.StackTrace);
throw;
}
}
private async Task ShowAsync(Snackbar snackbar, SnackbarMessageQueueItem messageQueueItem, ManualResetEvent actionClickWaitHandle)
{
//create and show the message, setting up all the handles we need to wait on
var tuple = CreateAndShowMessage(snackbar, messageQueueItem, actionClickWaitHandle);
var snackbarMessage = tuple.Item1;
var mouseNotOverManagedWaitHandle = tuple.Item2;
var durationPassedWaitHandle = new ManualResetEvent(false);
StartDuration(messageQueueItem.Duration.Add(snackbar.ActivateStoryboardDuration), durationPassedWaitHandle);
//wait until time span completed (including pauses and mouse overs), or the action is clicked
await WaitForCompletionAsync(mouseNotOverManagedWaitHandle, durationPassedWaitHandle, actionClickWaitHandle);
//close message on snackbar
snackbar.SetCurrentValue(Snackbar.IsActiveProperty, false);
//we could wait for the animation event, but just doing
//this for now...at least it is prevent extra call back hell
await Task.Delay(snackbar.DeactivateStoryboardDuration);
//this prevents missing resource warnings after the message is removed from the Snackbar
//see https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/issues/2040
snackbarMessage.Resources = SnackbarMessage.defaultResources;
//remove message on snackbar
snackbar.SetCurrentValue(Snackbar.MessageProperty, null);
mouseNotOverManagedWaitHandle.Dispose();
durationPassedWaitHandle.Dispose();
}
public void Enqueue <TArgument>(object content, object actionContent, Action <TArgument> actionHandler,
TArgument actionArgument, bool promote)
{
if (content == null)
{
throw new ArgumentNullException(nameof(content));
}
if ((actionContent != null || actionHandler != null || actionArgument != null)
&&
actionContent == null && actionHandler == null && actionArgument == null)
{
throw new ArgumentException("All action arguments must be provided if any are provided.",
nameof(actionContent));
}
var argumentType = actionArgument != null ? typeof(TArgument) : null;
var snackbarMessageQueueItem = new SnackbarMessageQueueItem(content, actionContent, actionHandler,
actionArgument, argumentType, promote);
if (promote)
{
InsertAsLastNotPromotedNode(snackbarMessageQueueItem);
}
else
{
_snackbarMessages.AddLast(snackbarMessageQueueItem);
}
_messageWaitingEvent.Set();
}
private static SnackbarMessage Create(SnackbarMessageQueueItem messageQueueItem)
{
return(new SnackbarMessage
{
Content = messageQueueItem.Content,
ActionContent = messageQueueItem.ActionContent
});
}
private async void PumpAsync()
{
while (!_isDisposed)
{
var eventId = WaitHandle.WaitAny(new WaitHandle[] { _disposedEvent, _messageWaitingEvent });
if (eventId == 0)
{
continue;
}
Snackbar exemplar = _pairedSnackbars.FirstOrDefault();
if (exemplar == null)
{
Trace.TraceWarning(
"A snackbar message as waiting, but no Snackbar instances are assigned to the message queue.");
_disposedEvent.WaitOne(TimeSpan.FromSeconds(1));
continue;
}
//find a target
var snackbar = await FindSnackbar(exemplar.Dispatcher);
//show message
if (snackbar != null)
{
SnackbarMessageQueueItem message = _snackbarMessages.First.Value;
_snackbarMessages.RemoveFirst();
if (_latestShownItem == null ||
IgnoreDuplicate ||
message.IgnoreDuplicate ||
!Equals(_latestShownItem.Item1.Content, message.Content) ||
!Equals(_latestShownItem.Item1.ActionContent, message.ActionContent) ||
_latestShownItem.Item2 <= DateTime.Now.Subtract(_messageDuration))
{
await ShowAsync(snackbar, message);
_latestShownItem = new Tuple <SnackbarMessageQueueItem, DateTime>(message, DateTime.Now);
}
}
else
{
//no snackbar could be found, take a break
_disposedEvent.WaitOne(TimeSpan.FromSeconds(1));
}
if (_snackbarMessages.Count > 0)
{
_messageWaitingEvent.Set();
}
else
{
_messageWaitingEvent.Reset();
}
}
}
/// <summary>
/// Checks if given item is a duplicate to this
/// </summary>
/// <param name="item">Item to check for duplicate</param>
/// <returns><c>true</c> if given item is a duplicate to this, <c>false</c> otherwise</returns>
public bool IsDuplicate(SnackbarMessageQueueItem item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
return(!IgnoreDuplicate &&
Equals(item.Content, Content) &&
Equals(item.ActionContent, ActionContent));
}
public bool IsDuplicate(SnackbarMessageQueueItem value)
{
if (value is null)
{
throw new ArgumentNullException(nameof(value));
}
if (AlwaysShow)
{
return(false);
}
return(Equals(value));
}
private static void DoActionCallback(SnackbarMessageQueueItem messageQueueItem)
{
try
{
messageQueueItem.ActionHandler(messageQueueItem.ActionArgument);
}
catch (Exception exc)
{
Trace.WriteLine("Error during SnackbarMessageQueue message action callback, exception will be rethrown.");
Trace.WriteLine($"{exc.Message} ({exc.GetType().FullName})");
Trace.WriteLine(exc.StackTrace);
throw;
}
}
private void InsertAsLastNotPromotedNode(SnackbarMessageQueueItem snackbarMessageQueueItem)
{
var node = _snackbarMessages.First;
while (node != null)
{
if (!node.Value.IsPromoted)
{
_snackbarMessages.AddBefore(node, snackbarMessageQueueItem);
return;
}
node = node.Next;
}
_snackbarMessages.AddLast(snackbarMessageQueueItem);
}
private async Task ShowAsync(Snackbar snackbar, SnackbarMessageQueueItem messageQueueItem)
{
await Task.Run(async() =>
{
//create and show the message, setting up all the handles we need to wait on
var actionClickWaitHandle = new ManualResetEvent(false);
var mouseNotOverManagedWaitHandle =
await
snackbar.Dispatcher.InvokeAsync(
() => CreateAndShowMessage(snackbar, messageQueueItem, actionClickWaitHandle));
var durationPassedWaitHandle = new ManualResetEvent(false);
DurationMonitor.Start(messageQueueItem.Duration.Add(snackbar.ActivateStoryboardDuration),
_pausedEvent, durationPassedWaitHandle, _disposedEvent);
//wait until time span completed (including pauses and mouse overs), or the action is clicked
await WaitForCompletionAsync(mouseNotOverManagedWaitHandle, durationPassedWaitHandle, actionClickWaitHandle);
//close message on snackbar
await
snackbar.Dispatcher.InvokeAsync(
() => snackbar.SetCurrentValue(Snackbar.IsActiveProperty, false));
//we could wait for the animation event, but just doing
//this for now...at least it is prevent extra call back hell
_disposedEvent.WaitOne(snackbar.DeactivateStoryboardDuration);
//remove message on snackbar
await snackbar.Dispatcher.InvokeAsync(
() => snackbar.SetCurrentValue(Snackbar.MessageProperty, null));
mouseNotOverManagedWaitHandle.Dispose();
durationPassedWaitHandle.Dispose();
})
.ContinueWith(t =>
{
if (t.Exception == null)
{
return;
}
var exc = t.Exception.InnerExceptions.FirstOrDefault() ?? t.Exception;
Trace.WriteLine("Error occured whilst showing Snackbar, exception will be rethrown.");
Trace.WriteLine($"{exc.Message} ({exc.GetType().FullName})");
Trace.WriteLine(exc.StackTrace);
throw t.Exception;
});
}
private static MouseNotOverManagedWaitHandle CreateAndShowMessage(UIElement snackbar,
SnackbarMessageQueueItem messageQueueItem, EventWaitHandle actionClickWaitHandle)
{
var clickCount = 0;
SnackbarMessage snackbarMessage = Create(messageQueueItem);
snackbarMessage.ActionClick += (sender, args) =>
{
if (++clickCount == 1)
{
DoActionCallback(messageQueueItem);
}
actionClickWaitHandle.Set();
};
snackbar.SetCurrentValue(Snackbar.MessageProperty, snackbarMessage);
snackbar.SetCurrentValue(Snackbar.IsActiveProperty, true);
return(new MouseNotOverManagedWaitHandle(snackbar));
}
public void Enqueue(object content, object actionContent, Action <object> actionHandler,
object actionArgument, bool promote, bool neverConsiderToBeDuplicate, TimeSpan?durationOverride = null)
{
if (content is null)
{
throw new ArgumentNullException(nameof(content));
}
if (actionContent is null ^ actionHandler is null)
{
throw new ArgumentException("All action arguments must be provided if any are provided.",
actionContent != null ? nameof(actionContent) : nameof(actionHandler));
}
var snackbarMessageQueueItem = new SnackbarMessageQueueItem(content, durationOverride ?? _messageDuration,
actionContent, actionHandler, actionArgument, promote, neverConsiderToBeDuplicate);
InsertItem(snackbarMessageQueueItem);
}
private void InsertItem(SnackbarMessageQueueItem item)
{
var node = _snackbarMessages.First;
while (node != null)
{
if (!IgnoreDuplicate && item.IsDuplicate(node.Value))
{
return;
}
if (item.IsPromoted && !node.Value.IsPromoted)
{
_snackbarMessages.AddBefore(node, item);
return;
}
node = node.Next;
}
_snackbarMessages.AddLast(item);
}
