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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
namespace Xamarin.Forms.Controls
{
public partial class TwitterPage : ContentPage
{
private TwitterViewModel ViewModel
{
get { return BindingContext as TwitterViewModel; }
}
public TwitterPage()
{
InitializeComponent();
BindingContext = new TwitterViewModel();
listView.ItemTapped += (sender, args) =>
{
if (listView.SelectedItem == null)
return;
var tweet = listView.SelectedItem as Tweet;
this.Navigation.PushAsync(new WebsiteView("http://m.twitter.com/shanselman/status/" + tweet.StatusID, tweet.Date));
listView.SelectedItem = null;
};
}
protected override void OnAppearing()
{
base.OnAppearing();
if (ViewModel == null || !ViewModel.CanLoadMore || ViewModel.IsBusy || ViewModel.Tweets.Count > 0)
return;
ViewModel.LoadTweetsCommand.Execute(null);
}
}
public class TwitterViewModel : HBaseViewModel
{
public ObservableCollection<Tweet> Tweets { get; set; }
public TwitterViewModel()
{
Title = "Twitter";
Icon = "slideout.png";
Tweets = new ObservableCollection<Tweet>();
}
private Command loadTweetsCommand;
public Command LoadTweetsCommand
{
get
{
return loadTweetsCommand ??
(loadTweetsCommand = new Command(async () =>
{
await ExecuteLoadTweetsCommand();
}, () =>
{
return !IsBusy;
}));
}
}
public async Task ExecuteLoadTweetsCommand()
{
if (IsBusy)
return;
IsBusy = true;
LoadTweetsCommand.ChangeCanExecute();
var error = false;
try
{
Tweets.Clear();
//var auth = new ApplicationOnlyAuthorizer()
//{
// CredentialStore = new InMemoryCredentialStore
// {
// ConsumerKey = "ZTmEODUCChOhLXO4lnUCEbH2I",
// ConsumerSecret = "Y8z2Wouc5ckFb1a0wjUDT9KAI6DUat5tFNdmIkPLl8T4Nyaa2J",
// },
//};
//await auth.AuthorizeAsync();
//var twitterContext = new TwitterContext(auth);
//var queryResponse = await
// (from tweet in twitterContext.Status
// where tweet.Type == StatusType.User &&
// tweet.ScreenName == "shanselman" &&
// tweet.Count == 100 &&
// tweet.IncludeRetweets == true &&
// tweet.ExcludeReplies == true
// select tweet).ToListAsync();
//var tweets =
// (from tweet in queryResponse
// select new Tweet
// {
// StatusID = tweet.StatusID,
// ScreenName = tweet.User.ScreenNameResponse,
// Text = tweet.Text,
// CurrentUserRetweet = tweet.CurrentUserRetweet,
// CreatedAt = tweet.CreatedAt,
// Image = tweet.RetweetedStatus != null && tweet.RetweetedStatus.User != null ?
// tweet.RetweetedStatus.User.ProfileImageUrl.Replace("http://", "https://") : (tweet.User.ScreenNameResponse == "shanselman" ? "scott159.png" : tweet.User.ProfileImageUrl.Replace("http://", "https://"))
// }).ToList();
//foreach (var tweet in tweets)
//{
// Tweets.Add(tweet);
//}
if (Device.OS == TargetPlatform.iOS)
{
// only does anything on iOS, for the Watch
// DependencyService.Get<ITweetStore>().Save(tweets);
}
}
catch
{
error = true;
}
if (error)
{
var page = new ContentPage();
await page.DisplayAlert("Error", "Unable to load tweets.", "OK");
}
IsBusy = false;
LoadTweetsCommand.ChangeCanExecute();
}
}
public class Tweet
{
public Tweet()
{
}
public ulong StatusID { get; set; }
public string ScreenName { get; set; }
public string Text { get; set; }
//[JsonIgnore]
public string Date { get { return CreatedAt.ToString("g"); } }
//[JsonIgnore]
public string RTCount { get { return CurrentUserRetweet == 0 ? string.Empty : CurrentUserRetweet + " RT"; } }
public string Image { get; set; }
public DateTime CreatedAt
{
get;
set;
}
public ulong CurrentUserRetweet
{
get;
set;
}
}
public interface ITweetStore
{
void Save(System.Collections.Generic.List<Tweet> tweets);
//System.Collections.Generic.List<Hanselman.Shared.Tweet> Load ();
}
}
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