[GUI] Block UI when an export is underway

DiscordChatExporter.Gui/Converters/DateTimeOffsetToDateTimeConverter.cs

@@ -11,18 +11,18 @@ namespace DiscordChatExporter.Gui.Converters
 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            if (value is DateTimeOffset date)
-                return date.DateTime;
+            if (value is DateTimeOffset dateTimeOffsetValue)
+                return dateTimeOffsetValue.DateTime;
 
-            return null;
+            return default;
         }
 
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            if (value is DateTime date)
-                return new DateTimeOffset(date);
+            if (value is DateTime dateTimeValue)
+                return new DateTimeOffset(dateTimeValue);
 
-            return null;
+            return default;
         }
     }
 }

DiscordChatExporter.Gui/Converters/ExportFormatToStringConverter.cs

@@ -12,10 +12,10 @@ namespace DiscordChatExporter.Gui.Converters
 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            if (value is ExportFormat format)
-                return format.GetDisplayName();
+            if (value is ExportFormat exportFormatValue)
+                return exportFormatValue.GetDisplayName();
 
-            return null;
+            return default;
         }
 
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

DiscordChatExporter.Gui/Converters/InverseBoolConverter.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace DiscordChatExporter.Gui.Converters
+{
+    [ValueConversion(typeof(bool), typeof(bool))]
+    public class InverseBoolConverter : IValueConverter
+    {
+        public static InverseBoolConverter Instance { get; } = new InverseBoolConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool boolValue)
+                return !boolValue;
+
+            return default;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool boolValue)
+                return !boolValue;
+
+            return default;
+        }
+    }
+}

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -61,6 +61,7 @@
     <Compile Include="Bootstrapper.cs" />
     <Compile Include="Converters\DateTimeOffsetToDateTimeConverter.cs" />
     <Compile Include="Converters\ExportFormatToStringConverter.cs" />
+    <Compile Include="Converters\InverseBoolConverter.cs" />
     <Compile Include="ViewModels\Components\ChannelViewModel.cs" />
     <Compile Include="ViewModels\Components\GuildViewModel.cs" />
     <Compile Include="ViewModels\Dialogs\ExportSetupViewModel.cs" />

DiscordChatExporter.Gui/ViewModels/Framework/DialogScreen.cs

@@ -6,7 +6,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Framework
     {
         public T DialogResult { get; private set; }
 
-        public void Close(T dialogResult = default(T))
+        public void Close(T dialogResult = default)
         {
             // Set the result
             DialogResult = dialogResult;

DiscordChatExporter.Gui/Views/RootView.xaml

@@ -3,6 +3,7 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:behaviors="clr-namespace:DiscordChatExporter.Gui.Behaviors"
+    xmlns:converters="clr-namespace:DiscordChatExporter.Gui.Converters"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
     xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
@@ -124,7 +125,7 @@
                 Value="{Binding ProgressManager.Progress, Mode=OneWay}" />
 
             <!--  Content  -->
-            <Grid Grid.Row="2">
+            <Grid Grid.Row="2" IsEnabled="{Binding IsBusy, Converter={x:Static converters:InverseBoolConverter.Instance}}">
                 <!--  Placeholder / usage instructions  -->
                 <Grid Margin="32,32,8,8" Visibility="{Binding AvailableGuilds, Converter={x:Static s:BoolToVisibilityConverter.InverseInstance}}">
                     <!--  For user token  -->