public MainPageViewModel(INavigationService navigationService, IMessageService messageService)
: base(navigationService)
{
_messageService = messageService;
Title = "チャット";
SendMessageCommand = Text.Select(s => !string.IsNullOrEmpty(s)).ToAsyncReactiveCommand();
SendMessageCommand.Subscribe(async() =>
{
try
{
await _messageService.SendMessage(Text.Value);
Text.Value = null;
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e);
}
});
_messageService.Notified.Subscribe(message =>
{
Messages.Add(message);
});
}
public TextChannelPageViewModel()
{
IsInvalidTextChannel = new ReactiveProperty <bool>(false);
NowSendingMessage = new ReactiveProperty <bool>()
.AddTo(_CompositeDisposable);
RawMessages = new ObservableCollection <IMessage>();
var uiDispatcher = Windows.UI.Xaml.Window.Current.Dispatcher;
Messages = new ObservableCollection <MessageAggregatedByAuthorViewModel>();
NowMessageLoading = new ReactiveProperty <bool>(false);
RawMessages
.CollectionChangedAsObservable()
.Subscribe(async(x) =>
{
using (var releaser = await _MessageUpdateLock.LockAsync())
{
if (x.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
{
var items = x.NewItems;
// 前回受け取ったメッセージと同じ送信者の場合は
// 前回生成したMessageVMにIMessageをまとめる
foreach (var item in items.Cast <IMessage>())
{
var lastMessage = Messages.LastOrDefault();
if (lastMessage?.IsSameAuthor(item) ?? false)
{
await uiDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
lastMessage.AddMessage(item);
});
}
else
{
// 新規
await uiDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
Messages.Add(new MessageAggregatedByAuthorViewModel(item));
});
}
}
}
else if (x.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove)
{
var items = x.OldItems;
// 前回受け取ったメッセージと同じ送信者の場合は
// 前回生成したMessageVMにIMessageをまとめる
foreach (var item in items.Cast <IMessage>())
{
await uiDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
var message = Messages.FirstOrDefault(y => y.TryRemoveMessage(item));
if (message?.Messages.Count == 0)
{
Messages.Remove(message);
}
});
}
}
}
})
.AddTo(_CompositeDisposable);
SendMessageText = new ReactiveProperty <string>("")
.AddTo(_CompositeDisposable);
SendMessageCommand =
Observable.CombineLatest(
NowSendingMessage.Select(x => !x),
SendMessageText.Select(x => !string.IsNullOrEmpty(x))
)
.Select(x => x.All(y => y))
.ToReactiveCommand()
.AddTo(_CompositeDisposable);
SendMessageCommand.Subscribe(async x => await SendMessage(SendMessageText.Value))
.AddTo(_CompositeDisposable);
}