feat: implement availability

XIVChat Desktop/Connection.cs

@@ -28,6 +28,16 @@ namespace XIVChat_Desktop {
         public event PropertyChangedEventHandler? PropertyChanged;
         public string? CurrentChannel { get; private set; }
 
+        private bool available;
+
+        public bool Available {
+            get => this.available;
+            private set {
+                this.available = value;
+                this.OnPropertyChanged(nameof(this.Available));
+            }
+        }
+
         public Connection(App app, string host, ushort port) {
             this.app = app;
 
@@ -195,6 +205,9 @@ namespace XIVChat_Desktop {
             // remove player data
             this.SetPlayerData(null);
 
+            // set availability
+            this.Available = false;
+
             // at this point, we are disconnected, so log it
             this.app.Dispatch(() => {
                 this.app.Window.AddSystemMessage("Disconnected");
@@ -234,6 +247,9 @@ namespace XIVChat_Desktop {
                     this.SetPlayerData(playerData);
                     break;
                 case ServerOperation.Availability:
+                    var availability = Availability.Decode(payload);
+
+                    this.Available = availability.available;
                     break;
                 case ServerOperation.Channel:
                     var channel = ServerChannel.Decode(payload);
@@ -287,5 +303,22 @@ namespace XIVChat_Desktop {
                 window.Location.Visibility = visibility;
             });
         }
+
+        private void OnPropertyChanged(string prop) {
+            Action action;
+
+            if (prop == nameof(this.Available)) {
+                action = () => {
+                    this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(this.Available)));
+                    this.app.Window.OnPropertyChanged(nameof(MainWindow.InputPlaceholder));
+                };
+            } else {
+                action = () => {
+                    this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(prop));
+                };
+            }
+
+            this.app.Dispatch(action);
+        }
     }
 }

XIVChat Desktop/MainWindow.xaml

@@ -97,12 +97,14 @@
                                    Grid.Row="1"
                                    Text="{Binding App.Connection.CurrentChannel, ElementName=Main, UpdateSourceTrigger=PropertyChanged}" />
 
-                        <TextBox ui:ControlHelper.PlaceholderText="Send a message..."
-                                 Grid.Row="2"
-                                 Margin="0,0,0,8"
-                                 TextWrapping="Wrap"
-                                 SpellCheck.IsEnabled="True"
-                                 KeyDown="Input_Submit" />
+                        <TextBox
+                            ui:ControlHelper.PlaceholderText="{Binding InputPlaceholder, ElementName=Main, UpdateSourceTrigger=PropertyChanged}"
+                            IsEnabled="{Binding App.Connection.Available, ElementName=Main, UpdateSourceTrigger=PropertyChanged, FallbackValue=False}"
+                            Grid.Row="2"
+                            Margin="0,0,0,8"
+                            TextWrapping="Wrap"
+                            SpellCheck.IsEnabled="True"
+                            KeyDown="Input_Submit" />
                     </Grid>
                 </DataTemplate>
             </TabControl.ContentTemplate>

XIVChat Desktop/MainWindow.xaml.cs

@@ -1,6 +1,7 @@
 using System;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
@@ -12,11 +13,13 @@ namespace XIVChat_Desktop {
     /// <summary>
     /// Interaction logic for MainWindow.xaml
     /// </summary>
-    public partial class MainWindow {
+    public partial class MainWindow : INotifyPropertyChanged {
         public App App => (App)Application.Current;
 
         public List<ServerMessage> Messages { get; } = new List<ServerMessage>();
 
+        public string InputPlaceholder => this.App.Connection?.Available == true ? "Send a message..." : "Chat is currently unavailable";
+
         public MainWindow() {
             this.InitializeComponent();
             this.DataContext = this;
@@ -162,5 +165,11 @@ namespace XIVChat_Desktop {
         private void Scan_Click(object sender, RoutedEventArgs e) {
             new ServerScan(this).Show();
         }
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        internal virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null) {
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
     }
 }