polychat/PolyChat/MainPage.xaml.cs

using PolyChat.Models;
using PolyChat.Util;
using PolyChat.Views;
using System;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace PolyChat
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        private Controller Controller;
        private ObservableCollection<ChatPartner> Partners;
        private ChatPartner selectedPartner = null;
        private string username;
        public MainPage()
        {
            this.InitializeComponent();
            // init controller
            Controller = new Controller(this);
            // ui variables
            ipAddress.Text = IP.GetCodeFromIP(Controller.getIP());
            Partners = new ObservableCollection<ChatPartner>();
            updateNoChatsPlaceholder();
            updateNoUsernamePlaceholder();
            updateNoChatSelected();
            updateSendButtonEnabled();
        }

        public async void ShowConnectionError(string code, string heading, string message)
        {
            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                Dialog dialog = new Dialog(
                Dialog.TYPE_ERROR,
                heading,
                message,
                new DialogButton(
                    "Retry",
                    () =>
                    {
                        Controller.Connect(code);
                        Partners.Add(new ChatPartner(
                            "Connecting...",
                            code
                        ));
                        updateNoChatsPlaceholder();
                    }
                ),
                new DialogButton(
                    "Ignore",
                    () => { /* do nothing */ }
                )
            );
            });
        }

        // EVENTS

        public void OnSendMessage(object sender = null, RoutedEventArgs e = null)
        {
            selectedPartner.AddMessage(new ChatMessage(username, "message", inputSend.Text));
            Controller.SendMessage(selectedPartner.Code, "message", inputSend.Text);
            // clear input
            inputSend.Text = "";
        }

        public async void OnOpenNewChatDialog(object sender = null, RoutedEventArgs e = null)
        {
            NewChatDialog dialog = new NewChatDialog();
            var result = await dialog.ShowAsync();
            if (result == ContentDialogResult.Primary)
            {
                string ip = IP.GetIPfromCode(dialog.getValue());
                Controller.Connect(ip);
                Partners.Add(new ChatPartner(
                    "Connecting...",
                    ip
                ));
                updateNoChatsPlaceholder();
            }
        }

        public async void OnOpenEditUsernameDialog(object sender = null, RoutedEventArgs e = null)
        {
            EditUsernameDialog dialog = new EditUsernameDialog(username);
            var result = await dialog.ShowAsync();
            if (result == ContentDialogResult.Primary)
            {
                username = dialog.getValue();
                if (username.Length == 0) textUsername.Text = "Unknown";
                else textUsername.Text = username;
            }
            updateNoUsernamePlaceholder();
        }

        /// <summary>
        /// Adds a new ChatPartner to the UI with default Name.
        /// </summary>
        /// <param name="ip">IP Adress, gets shown as Util.IP > Code</param>
        public async void OnIncomingConnection(string ip)
        {
            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                Partners.Add(new ChatPartner(
                    "Connecting...",
                    ip
                ));
                updateNoChatsPlaceholder();
            });
        }
        /// <summary>
        /// Adds an message to the UI, based on .sender if known
        /// </summary>
        /// <param name="message">ChatMessage</param>
        public void OnIncomingMessage(string origin, string json)
        {
            ChatPartner sendingPartner = Partners.FirstOrDefault(p => p.Code == origin);
            sendingPartner.AddMessage(new ChatMessage(origin, json));
        }

        private void OnDeleteChat(object sender = null, RoutedEventArgs e = null)
        {
            Controller.CloseChat(selectedPartner.Code);
            Partners.Remove(selectedPartner);
            updateNoChatsPlaceholder();
            updateNoChatSelected();
        }

        public async void OnChatPartnerDeleted(string code)
        {
            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                Partners.Remove(Partners.FirstOrDefault(p => p.Code.Equals(code)));
                selectedPartner = null;
                updateNoChatsPlaceholder();
                updateNoChatSelected();
            });
        }
        public void OnChatPartnerSelected(object sender, RoutedEventArgs e)
        {
            string code = ((RadioButton)sender).Tag.ToString();
            selectedPartner = Partners.FirstOrDefault(p => p.Code == code);
            listViewMessages.ItemsSource = selectedPartner.Messages;
            selectedPartnerName.Text = selectedPartner.Name;
            updateNoChatSelected();
        }

        private void OnKeyUp(object sender, Windows.UI.Xaml.Input.KeyRoutedEventArgs e)
        {
            updateSendButtonEnabled();
            if (e.Key == Windows.System.VirtualKey.Enter)
            {
                OnSendMessage();
            }
        }

        // UPDATE FUNCTIONS FOR UI PLACEHOLDERS

        private void updateNoChatsPlaceholder()
        {
            textNoChats.Visibility = Partners.Count() == 0 ? Visibility.Visible : Visibility.Collapsed;
        }

        private void updateNoUsernamePlaceholder()
        {
            if (username == null)
            {
                textNoUsername.Visibility = Visibility.Visible;
                textUsername.Visibility = Visibility.Collapsed;
            }
            else
            {
                textNoUsername.Visibility = Visibility.Collapsed;
                textUsername.Visibility = Visibility.Visible;
            }
        }

        private void updateNoChatSelected()
        {
            if (selectedPartner != null)
            {
                gridRight.Visibility = Visibility.Visible;
                textNoChatSelected.Visibility = Visibility.Collapsed;
            }
            else
            {
                gridRight.Visibility = Visibility.Collapsed;
                textNoChatSelected.Visibility = Visibility.Visible;
            }
        }

        private void updateSendButtonEnabled()
        {
            buttonSend.IsEnabled = inputSend.Text.Length != 0;
        }
    }
}