private void joinedChannelsChanged(object sender, NotifyCollectionChangedEventArgs args)
{
switch (args.Action)
{
case NotifyCollectionChangedAction.Add:
IEnumerable <Channel> newChannels = args.NewItems.OfType <Channel>().Where(isChatChannel);
foreach (var channel in newChannels)
{
channelList.AddChannel(channel);
}
break;
case NotifyCollectionChangedAction.Remove:
IEnumerable <Channel> leftChannels = args.OldItems.OfType <Channel>().Where(isChatChannel);
foreach (var channel in leftChannels)
{
channelList.RemoveChannel(channel);
if (loadedChannels.ContainsKey(channel))
{
ChatOverlayDrawableChannel loaded = loadedChannels[channel];
loadedChannels.Remove(channel);
// DrawableChannel removed from cache must be manually disposed
loaded.Dispose();
}
}
break;
}
}
private void currentChannelChanged(ValueChangedEvent <Channel> channel)
{
Channel?newChannel = channel.NewValue;
// null channel denotes that we should be showing the listing.
if (newChannel == null)
{
currentChannel.Value = channelList.ChannelListingChannel;
return;
}
if (newChannel is ChannelListing.ChannelListingChannel)
{
currentChannelContainer.Clear(false);
channelListing.Show();
textBar.ShowSearch.Value = true;
}
else
{
channelListing.Hide();
textBar.ShowSearch.Value = false;
if (loadedChannels.ContainsKey(newChannel))
{
currentChannelContainer.Clear(false);
currentChannelContainer.Add(loadedChannels[newChannel]);
}
else
{
loading.Show();
// Ensure the drawable channel is stored before async load to prevent double loading
ChatOverlayDrawableChannel drawableChannel = CreateDrawableChannel(newChannel);
loadedChannels.Add(newChannel, drawableChannel);
LoadComponentAsync(drawableChannel, loadedDrawable =>
{
// Ensure the current channel hasn't changed by the time the load completes
if (currentChannel.Value != loadedDrawable.Channel)
{
return;
}
// Ensure the cached reference hasn't been removed from leaving the channel
if (!loadedChannels.ContainsKey(loadedDrawable.Channel))
{
return;
}
currentChannelContainer.Clear(false);
currentChannelContainer.Add(loadedDrawable);
loading.Hide();
});
}
}
// Mark channel as read when channel switched
if (newChannel.Messages.Any())
{
channelManager.MarkChannelAsRead(newChannel);
}
}
