Add multichannel export to GUI

Closes #12

DiscordChatExporter.Core/Helpers/ExportHelper.cs

@@ -1,12 +1,19 @@
 using System;
 using System.IO;
+using System.Linq;
 using System.Text;
 using DiscordChatExporter.Core.Models;
+using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Core.Helpers
 {
     public static class ExportHelper
     {
+        public static bool IsDirectoryPath(string path)
+            => path.Last() == Path.DirectorySeparatorChar ||
+               path.Last() == Path.AltDirectorySeparatorChar ||
+               Path.GetExtension(path).IsBlank();
+
         public static string GetDefaultExportFileName(ExportFormat format, Guild guild, Channel channel,
             DateTime? from = null, DateTime? to = null)
         {

DiscordChatExporter.Core/Services/DataService.cs

@@ -121,9 +121,6 @@ namespace DiscordChatExporter.Core.Services
         {
             var result = new List<Message>();
 
-            // Report indeterminate progress
-            progress?.Report(-1);
-
             // Get the snowflakes for the selected range
             var firstId = from != null ? from.Value.ToSnowflake() : "0";
             var lastId = to != null ? to.Value.ToSnowflake() : DateTime.MaxValue.ToSnowflake();

DiscordChatExporter.Gui/Behaviors/ChannelViewModelMultiSelectionListBoxBehavior.cs

@@ -0,0 +1,8 @@
+using DiscordChatExporter.Gui.ViewModels.Components;
+
+namespace DiscordChatExporter.Gui.Behaviors
+{
+    public class ChannelViewModelMultiSelectionListBoxBehavior : MultiSelectionListBoxBehavior<ChannelViewModel>
+    {
+    }
+}

DiscordChatExporter.Gui/Behaviors/MultiSelectionListBoxBehavior.cs

@@ -0,0 +1,92 @@
+using System.Collections;
+using System.Collections.Specialized;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Interactivity;
+
+namespace DiscordChatExporter.Gui.Behaviors
+{
+    public class MultiSelectionListBoxBehavior<T> : Behavior<ListBox>
+    {
+        public static readonly DependencyProperty SelectedItemsProperty =
+            DependencyProperty.Register(nameof(SelectedItems), typeof(IList),
+                typeof(MultiSelectionListBoxBehavior<T>),
+                new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
+                    OnSelectedItemsChanged));
+
+        private static void OnSelectedItemsChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
+        {
+            var behavior = (MultiSelectionListBoxBehavior<T>) sender;
+            if (behavior._modelHandled) return;
+
+            if (behavior.AssociatedObject == null)
+                return;
+
+            behavior._modelHandled = true;
+            behavior.SelectItems();
+            behavior._modelHandled = false;
+        }
+
+        private bool _viewHandled;
+        private bool _modelHandled;
+
+        public IList SelectedItems
+        {
+            get => (IList) GetValue(SelectedItemsProperty);
+            set => SetValue(SelectedItemsProperty, value);
+        }
+
+        // Propagate selected items from model to view
+        private void SelectItems()
+        {
+            _viewHandled = true;
+
+            AssociatedObject.SelectedItems.Clear();
+            if (SelectedItems != null)
+            {
+                foreach (var item in SelectedItems)
+                    AssociatedObject.SelectedItems.Add(item);
+            }
+
+            _viewHandled = false;
+        }
+
+        // Propagate selected items from view to model
+        private void OnListBoxSelectionChanged(object sender, SelectionChangedEventArgs args)
+        {
+            if (_viewHandled) return;
+            if (AssociatedObject.Items.SourceCollection == null) return;
+
+            SelectedItems = AssociatedObject.SelectedItems.Cast<T>().ToArray();
+        }
+
+        // Re-select items when the set of items changes
+        private void OnListBoxItemsChanged(object sender, NotifyCollectionChangedEventArgs args)
+        {
+            if (_viewHandled) return;
+            if (AssociatedObject.Items.SourceCollection == null) return;
+            SelectItems();
+        }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+
+            AssociatedObject.SelectionChanged += OnListBoxSelectionChanged;
+            ((INotifyCollectionChanged) AssociatedObject.Items).CollectionChanged += OnListBoxItemsChanged;
+        }
+
+        /// <inheritdoc />
+        protected override void OnDetaching()
+        {
+            base.OnDetaching();
+
+            if (AssociatedObject != null)
+            {
+                AssociatedObject.SelectionChanged -= OnListBoxSelectionChanged;
+                ((INotifyCollectionChanged) AssociatedObject.Items).CollectionChanged -= OnListBoxItemsChanged;
+            }
+        }
+    }
+}

DiscordChatExporter.Gui/Converters/ExportFormatToStringConverter.cs

@@ -12,7 +12,7 @@ namespace DiscordChatExporter.Gui.Converters
 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            var format = (ExportFormat?) value;
+            var format = value as ExportFormat?;
             return format?.GetDisplayName();
         }
 

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -55,6 +55,8 @@
     <Compile Include="App.xaml.cs">
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Behaviors\ChannelViewModelMultiSelectionListBoxBehavior.cs" />
+    <Compile Include="Behaviors\MultiSelectionListBoxBehavior.cs" />
     <Compile Include="Bootstrapper.cs" />
     <Compile Include="Converters\ExportFormatToStringConverter.cs" />
     <Compile Include="ViewModels\Components\ChannelViewModel.cs" />
@@ -62,6 +64,7 @@
     <Compile Include="ViewModels\Dialogs\ExportSetupViewModel.cs" />
     <Compile Include="ViewModels\Framework\DialogManager.cs" />
     <Compile Include="ViewModels\Framework\DialogScreen.cs" />
+    <Compile Include="ViewModels\Framework\Extensions.cs" />
     <Compile Include="ViewModels\Framework\IViewModelFactory.cs" />
     <Compile Include="ViewModels\Dialogs\SettingsViewModel.cs" />
     <Compile Include="ViewModels\RootViewModel.cs" />
@@ -117,18 +120,27 @@
     </Page>
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Gress">
+      <Version>1.0.2</Version>
+    </PackageReference>
     <PackageReference Include="MaterialDesignColors">
       <Version>1.1.3</Version>
     </PackageReference>
     <PackageReference Include="MaterialDesignThemes">
       <Version>2.5.0.1205</Version>
     </PackageReference>
+    <PackageReference Include="Ookii.Dialogs.Wpf">
+      <Version>1.0.0</Version>
+    </PackageReference>
     <PackageReference Include="PropertyChanged.Fody">
       <Version>2.6.0</Version>
     </PackageReference>
     <PackageReference Include="Stylet">
       <Version>1.1.22</Version>
     </PackageReference>
+    <PackageReference Include="System.Windows.Interactivity.WPF">
+      <Version>2.0.20525</Version>
+    </PackageReference>
     <PackageReference Include="Tyrrrz.Extensions">
       <Version>1.5.1</Version>
     </PackageReference>

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -17,9 +17,11 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 
         public GuildViewModel Guild { get; set; }
 
-        public ChannelViewModel Channel { get; set; }
+        public IReadOnlyList<ChannelViewModel> Channels { get; set; }
 
-        public string FilePath { get; set; }
+        public bool IsSingleChannel => Channels.Count == 1;
+
+        public string OutputPath { get; set; }
 
         public IReadOnlyList<ExportFormat> AvailableFormats =>
             Enum.GetValues(typeof(ExportFormat)).Cast<ExportFormat>().ToArray();
@@ -59,18 +61,33 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
             if (To < From)
                 To = From;
 
-            // Generate default file name
-            var defaultFileName = ExportHelper.GetDefaultExportFileName(SelectedFormat, Guild, Channel, From, To);
-
-            // Prompt for output file path
-            var ext = SelectedFormat.GetFileExtension();
-            var filter = $"{ext.ToUpperInvariant()} files|*.{ext}";
-            FilePath = _dialogManager.PromptSaveFilePath(filter, defaultFileName);
+            // If single channel - prompt file path
+            if (IsSingleChannel)
+            {
+                // Get single channel
+                var channel = Channels.Single();
+
+                // Generate default file name
+                var defaultFileName = ExportHelper.GetDefaultExportFileName(SelectedFormat, Guild, channel, From, To);
+
+                // Generate filter
+                var ext = SelectedFormat.GetFileExtension();
+                var filter = $"{ext.ToUpperInvariant()} files|*.{ext}";
+
+                // Prompt user
+                OutputPath = _dialogManager.PromptSaveFilePath(filter, defaultFileName);
+            }
+            // If multiple channels - prompt dir path
+            else
+            {
+                // Prompt user
+                OutputPath = _dialogManager.PromptDirectoryPath();
+            }
 
             // If canceled - return
-            if (FilePath.IsBlank())
+            if (OutputPath.IsBlank())
                 return;
-            
+
             // Close dialog
             Close(true);
         }

DiscordChatExporter.Gui/ViewModels/Framework/DialogManager.cs

@@ -2,6 +2,7 @@
 using System.Threading.Tasks;
 using MaterialDesignThemes.Wpf;
 using Microsoft.Win32;
+using Ookii.Dialogs.Wpf;
 using Stylet;
 
 namespace DiscordChatExporter.Gui.ViewModels.Framework
@@ -54,5 +55,17 @@ namespace DiscordChatExporter.Gui.ViewModels.Framework
             // Show dialog and return result
             return dialog.ShowDialog() == true ? dialog.FileName : null;
         }
+
+        public string PromptDirectoryPath(string initialDirPath = "")
+        {
+            // Create dialog
+            var dialog = new VistaFolderBrowserDialog
+            {
+                SelectedPath = initialDirPath
+            };
+
+            // Show dialog and return result
+            return dialog.ShowDialog() == true ? dialog.SelectedPath : null;
+        }
     }
 }

DiscordChatExporter.Gui/ViewModels/Framework/Extensions.cs

@@ -0,0 +1,44 @@
+using System.Collections.Generic;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Gui.ViewModels.Components;
+using DiscordChatExporter.Gui.ViewModels.Dialogs;
+
+namespace DiscordChatExporter.Gui.ViewModels.Framework
+{
+    public static class Extensions
+    {
+        public static ChannelViewModel CreateChannelViewModel(this IViewModelFactory factory, Channel model,
+            string category = null)
+        {
+            var viewModel = factory.CreateChannelViewModel();
+            viewModel.Model = model;
+            viewModel.Category = category;
+
+            return viewModel;
+        }
+
+        public static GuildViewModel CreateGuildViewModel(this IViewModelFactory factory, Guild model,
+            IReadOnlyList<ChannelViewModel> channels)
+        {
+            var viewModel = factory.CreateGuildViewModel();
+            viewModel.Model = model;
+            viewModel.Channels = channels;
+
+            return viewModel;
+        }
+
+        public static ExportSetupViewModel CreateExportSetupViewModel(this IViewModelFactory factory,
+            GuildViewModel guild, IReadOnlyList<ChannelViewModel> channels)
+        {
+            var viewModel = factory.CreateExportSetupViewModel();
+            viewModel.Guild = guild;
+            viewModel.Channels = channels;
+
+            return viewModel;
+        }
+
+        public static ExportSetupViewModel CreateExportSetupViewModel(this IViewModelFactory factory,
+            GuildViewModel guild, ChannelViewModel channel)
+            => factory.CreateExportSetupViewModel(guild, new[] {channel});
+    }
+}

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -1,13 +1,16 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net;
 using System.Reflection;
 using DiscordChatExporter.Core.Exceptions;
+using DiscordChatExporter.Core.Helpers;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
 using DiscordChatExporter.Gui.ViewModels.Components;
 using DiscordChatExporter.Gui.ViewModels.Framework;
+using Gress;
 using MaterialDesignThemes.Wpf;
 using Stylet;
 using Tyrrrz.Extensions;
@@ -23,13 +26,13 @@ namespace DiscordChatExporter.Gui.ViewModels
         private readonly DataService _dataService;
         private readonly ExportService _exportService;
 
-        public SnackbarMessageQueue Notifications { get; } = new SnackbarMessageQueue(TimeSpan.FromSeconds(5));
+        public ISnackbarMessageQueue Notifications { get; } = new SnackbarMessageQueue(TimeSpan.FromSeconds(5));
 
-        public bool IsEnabled { get; private set; } = true;
+        public IProgressManager ProgressManager { get; } = new ProgressManager();
 
-        public bool IsProgressIndeterminate => Progress < 0;
+        public bool IsBusy { get; private set; }
 
-        public double Progress { get; private set; }
+        public bool IsProgressIndeterminate { get; private set; }
 
         public bool IsBotToken { get; set; }
 
@@ -39,6 +42,8 @@ namespace DiscordChatExporter.Gui.ViewModels
 
         public GuildViewModel SelectedGuild { get; set; }
 
+        public IReadOnlyList<ChannelViewModel> SelectedChannels { get; set; }
+
         public RootViewModel(IViewModelFactory viewModelFactory, DialogManager dialogManager,
             SettingsService settingsService, UpdateService updateService, DataService dataService,
             ExportService exportService)
@@ -52,7 +57,14 @@ namespace DiscordChatExporter.Gui.ViewModels
 
             // Set title
             var version = Assembly.GetExecutingAssembly().GetName().Version.ToString(3);
-            DisplayName = $"DiscordChatExporter v{version}";            
+            DisplayName = $"DiscordChatExporter v{version}";
+
+            // Update busy state when progress manager changes
+            ProgressManager.Bind(o => o.IsActive, (sender, args) => IsBusy = ProgressManager.IsActive);
+            ProgressManager.Bind(o => o.IsActive,
+                (sender, args) => IsProgressIndeterminate = ProgressManager.IsActive && ProgressManager.Progress <= 0);
+            ProgressManager.Bind(o => o.Progress,
+                (sender, args) => IsProgressIndeterminate = ProgressManager.IsActive && ProgressManager.Progress <= 0);
         }
 
         protected override async void OnViewLoaded()
@@ -110,16 +122,15 @@ namespace DiscordChatExporter.Gui.ViewModels
             await _dialogManager.ShowDialogAsync(dialog);
         }
 
-        public bool CanPopulateGuildsAndChannels => IsEnabled && TokenValue.IsNotBlank();
+        public bool CanPopulateGuildsAndChannels => !IsBusy && TokenValue.IsNotBlank();
 
         public async void PopulateGuildsAndChannels()
         {
+            // Create progress operation
+            var operation = ProgressManager.CreateOperation();
+
             try
             {
-                // Set busy state and indeterminate progress
-                IsEnabled = false;
-                Progress = -1;
-
                 // Sanitize token
                 TokenValue = TokenValue.Trim('"');
 
@@ -134,7 +145,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                 // Prepare available guild list
                 var availableGuilds = new List<GuildViewModel>();
 
-                // Direct Messages
+                // Get direct messages
                 {
                     // Get fake guild
                     var guild = Guild.DirectMessages;
@@ -150,66 +161,57 @@ namespace DiscordChatExporter.Gui.ViewModels
                         var category = channel.Type == ChannelType.DirectTextChat ? "Private" : "Group";
 
                         // Create channel view model
-                        var channelViewModel = _viewModelFactory.CreateChannelViewModel();
-                        channelViewModel.Model = channel;
-                        channelViewModel.Category = category;
+                        var channelViewModel = _viewModelFactory.CreateChannelViewModel(channel, category);
 
                         // Add to list
                         channelViewModels.Add(channelViewModel);
                     }
 
                     // Create guild view model
-                    var guildViewModel = _viewModelFactory.CreateGuildViewModel();
-                    guildViewModel.Model = guild;
-                    guildViewModel.Channels = channelViewModels.OrderBy(c => c.Category)
-                        .ThenBy(c => c.Model.Name)
-                        .ToArray();
+                    var guildViewModel = _viewModelFactory.CreateGuildViewModel(guild,
+                        channelViewModels.OrderBy(c => c.Category)
+                            .ThenBy(c => c.Model.Name)
+                            .ToArray());
 
                     // Add to list
                     availableGuilds.Add(guildViewModel);
                 }
 
-                // Guilds
+                // Get guilds
+                var guilds = await _dataService.GetUserGuildsAsync(token);
+                foreach (var guild in guilds)
                 {
-                    // Get guilds
-                    var guilds = await _dataService.GetUserGuildsAsync(token);
-                    foreach (var guild in guilds)
-                    {
-                        // Get channels
-                        var channels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
+                    // Get channels
+                    var channels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
 
-                        // Get category channels
-                        var categoryChannels = channels.Where(c => c.Type == ChannelType.Category).ToArray();
+                    // Get category channels
+                    var categoryChannels = channels.Where(c => c.Type == ChannelType.Category).ToArray();
 
-                        // Get text channels
-                        var textChannels = channels.Where(c => c.Type == ChannelType.GuildTextChat).ToArray();
+                    // Get text channels
+                    var textChannels = channels.Where(c => c.Type == ChannelType.GuildTextChat).ToArray();
 
-                        // Create channel view models
-                        var channelViewModels = new List<ChannelViewModel>();
-                        foreach (var channel in textChannels)
-                        {
-                            // Get category
-                            var category = categoryChannels.FirstOrDefault(c => c.Id == channel.ParentId)?.Name;
-
-                            // Create channel view model
-                            var channelViewModel = _viewModelFactory.CreateChannelViewModel();
-                            channelViewModel.Model = channel;
-                            channelViewModel.Category = category;
-
-                            // Add to list
-                            channelViewModels.Add(channelViewModel);
-                        }
-
-                        // Create guild view model
-                        var guildViewModel = _viewModelFactory.CreateGuildViewModel();
-                        guildViewModel.Model = guild;
-                        guildViewModel.Channels = channelViewModels.OrderBy(c => c.Category)
-                            .ThenBy(c => c.Model.Name)
-                            .ToArray();
+                    // Create channel view models
+                    var channelViewModels = new List<ChannelViewModel>();
+                    foreach (var channel in textChannels)
+                    {
+                        // Get category
+                        var category = categoryChannels.FirstOrDefault(c => c.Id == channel.ParentId)?.Name;
+
+                        // Create channel view model
+                        var channelViewModel = _viewModelFactory.CreateChannelViewModel(channel, category);
 
                         // Add to list
-                        availableGuilds.Add(guildViewModel);
+                        channelViewModels.Add(channelViewModel);
                     }
+
+                    // Create guild view model
+                    var guildViewModel = _viewModelFactory.CreateGuildViewModel(guild,
+                        channelViewModels.OrderBy(c => c.Category)
+                            .ThenBy(c => c.Model.Name)
+                            .ToArray());
+
+                    // Add to list
+                    availableGuilds.Add(guildViewModel);
                 }
 
                 // Update available guild list
@@ -228,61 +230,73 @@ namespace DiscordChatExporter.Gui.ViewModels
             }
             finally
             {
-                // Reset busy state and progress
-                Progress = 0;
-                IsEnabled = true;
-            }            
+                // Dispose progress operation
+                operation.Dispose();
+            }
         }
 
-        public bool CanExportChannel => IsEnabled;
+        public bool CanExportChannels => !IsBusy && SelectedChannels.NotNullAndAny();
 
-        public async void ExportChannel(ChannelViewModel channel)
+        public async void ExportChannels()
         {
-            try
-            {
-                // Set busy state and indeterminate progress
-                IsEnabled = false;
-                Progress = -1;
+            // Get last used token
+            var token = _settingsService.LastToken;
 
-                // Get last used token
-                var token = _settingsService.LastToken;
+            // Create dialog
+            var dialog = _viewModelFactory.CreateExportSetupViewModel(SelectedGuild, SelectedChannels);
 
-                // Create dialog
-                var dialog = _viewModelFactory.CreateExportSetupViewModel();
-                dialog.Guild = SelectedGuild;
-                dialog.Channel = channel;
+            // Show dialog, if canceled - return
+            if (await _dialogManager.ShowDialogAsync(dialog) != true)
+                return;
 
-                // Show dialog, if canceled - return
-                if (await _dialogManager.ShowDialogAsync(dialog) != true)
-                    return;
+            // Create a progress operation for each channel to export
+            var operations = ProgressManager.CreateOperations(dialog.Channels.Count);
 
-                // Create progress handler
-                var progressHandler = new Progress<double>(p => Progress = p);
+            // Export channels
+            for (var i = 0; i < dialog.Channels.Count; i++)
+            {
+                // Get operation and channel
+                var operation = operations[i];
+                var channel = dialog.Channels[i];
 
-                // Get chat log
-                var chatLog = await _dataService.GetChatLogAsync(token, dialog.Guild, dialog.Channel, dialog.From,
-                    dialog.To, progressHandler);
+                try
+                {
+                    // Generate file path if necessary
+                    var filePath = dialog.OutputPath;
+                    if (ExportHelper.IsDirectoryPath(filePath))
+                    {
+                        // Generate default file name
+                        var fileName = ExportHelper.GetDefaultExportFileName(dialog.SelectedFormat, dialog.Guild,
+                            channel, dialog.From, dialog.To);
 
-                // Export
-                _exportService.ExportChatLog(chatLog, dialog.FilePath, dialog.SelectedFormat,
-                    dialog.PartitionLimit);
+                        // Combine paths
+                        filePath = Path.Combine(filePath, fileName);
+                    }
 
-                // Notify completion
-                Notifications.Enqueue("Export complete");
-            }
-            catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
-            {
-                Notifications.Enqueue("You don't have access to this channel");
-            }
-            catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
-            {
-                Notifications.Enqueue("This channel doesn't exist");
-            }
-            finally
-            {
-                // Reset busy state and progress
-                Progress = 0;
-                IsEnabled = true;
+                    // Get chat log
+                    var chatLog = await _dataService.GetChatLogAsync(token, dialog.Guild, channel, 
+                        dialog.From, dialog.To, operation);
+
+                    // Export
+                    _exportService.ExportChatLog(chatLog, filePath, dialog.SelectedFormat,
+                        dialog.PartitionLimit);
+
+                    // Notify completion
+                    Notifications.Enqueue($"Channel [{channel.Model.Name}] successfully exported");
+                }
+                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
+                {
+                    Notifications.Enqueue($"You don't have access to channel [{channel.Model.Name}]");
+                }
+                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
+                {
+                    Notifications.Enqueue($"Channel [{channel.Model.Name}] doesn't exist");
+                }
+                finally
+                {
+                    // Dispose progress operation
+                    operation.Dispose();
+                }
             }
         }
     }

DiscordChatExporter.Gui/Views/Dialogs/ExportSetupView.xaml

@@ -30,22 +30,33 @@
                 </Ellipse.Fill>
             </Ellipse>
 
-            <!--  Guild and channel name  -->
+            <!--  Placeholder (for multiple channels)  -->
             <TextBlock
                 Grid.Column="1"
                 Margin="8,0,0,0"
                 VerticalAlignment="Center"
                 FontSize="19"
-                TextTrimming="CharacterEllipsis">
+                Text="Multiple channels"
+                TextTrimming="CharacterEllipsis"
+                Visibility="{Binding IsSingleChannel, Converter={x:Static s:BoolToVisibilityConverter.InverseInstance}}" />
+
+            <!--  Category and channel name (for single channel)  -->
+            <TextBlock
+                Grid.Column="1"
+                Margin="8,0,0,0"
+                VerticalAlignment="Center"
+                FontSize="19"
+                TextTrimming="CharacterEllipsis"
+                Visibility="{Binding IsSingleChannel, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
                 <Run
                     Foreground="{DynamicResource SecondaryTextBrush}"
-                    Text="{Binding Channel.Category, Mode=OneWay}"
-                    ToolTip="{Binding Channel.Category, Mode=OneWay}" />
+                    Text="{Binding Channels[0].Category, Mode=OneWay}"
+                    ToolTip="{Binding Channels[0].Category, Mode=OneWay}" />
                 <Run Text="/" />
                 <Run
                     Foreground="{DynamicResource PrimaryTextBrush}"
-                    Text="{Binding Channel.Model.Name, Mode=OneWay}"
-                    ToolTip="{Binding Channel.Model.Name, Mode=OneWay}" />
+                    Text="{Binding Channels[0].Model.Name, Mode=OneWay}"
+                    ToolTip="{Binding Channels[0].Model.Name, Mode=OneWay}" />
             </TextBlock>
         </Grid>
 

DiscordChatExporter.Gui/Views/RootView.xaml

@@ -2,7 +2,9 @@
     x:Class="DiscordChatExporter.Gui.Views.RootView"
     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: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"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:s="https://github.com/canton7/Stylet"
@@ -30,7 +32,6 @@
             <Grid
                 Grid.Row="0"
                 Background="{DynamicResource PrimaryHueMidBrush}"
-                IsEnabled="{Binding IsEnabled}"
                 TextElement.Foreground="{DynamicResource SecondaryInverseTextBrush}">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*" />
@@ -117,7 +118,7 @@
                 Grid.Row="1"
                 Background="{DynamicResource PrimaryHueMidBrush}"
                 IsIndeterminate="{Binding IsProgressIndeterminate}"
-                Value="{Binding Progress, Mode=OneWay}" />
+                Value="{Binding ProgressManager.Progress, Mode=OneWay}" />
 
             <!--  Content  -->
             <Grid Grid.Row="2">
@@ -186,10 +187,7 @@
                 </Grid>
 
                 <!--  Guilds and channels  -->
-                <Grid
-                    Background="{DynamicResource MaterialDesignCardBackground}"
-                    IsEnabled="{Binding IsEnabled}"
-                    Visibility="{Binding AvailableGuilds, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
+                <Grid Background="{DynamicResource MaterialDesignCardBackground}" Visibility="{Binding AvailableGuilds, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="Auto" />
                         <ColumnDefinition Width="*" />
@@ -203,7 +201,8 @@
                         <ListBox
                             ItemsSource="{Binding AvailableGuilds}"
                             ScrollViewer.VerticalScrollBarVisibility="Hidden"
-                            SelectedItem="{Binding SelectedGuild}">
+                            SelectedItem="{Binding SelectedGuild}"
+                            SelectionMode="Single">
                             <ListBox.ItemTemplate>
                                 <DataTemplate>
                                     <Grid
@@ -235,7 +234,13 @@
 
                     <!--  Channels  -->
                     <Border Grid.Column="1">
-                        <ListBox HorizontalContentAlignment="Stretch" ItemsSource="{Binding SelectedGuild.Channels}">
+                        <ListBox
+                            HorizontalContentAlignment="Stretch"
+                            ItemsSource="{Binding SelectedGuild.Channels}"
+                            SelectionMode="Extended">
+                            <i:Interaction.Behaviors>
+                                <behaviors:ChannelViewModelMultiSelectionListBoxBehavior SelectedItems="{Binding SelectedChannels}" />
+                            </i:Interaction.Behaviors>
                             <ListBox.ItemTemplate>
                                 <DataTemplate>
                                     <StackPanel
@@ -243,12 +248,6 @@
                                         Background="Transparent"
                                         Cursor="Hand"
                                         Orientation="Horizontal">
-                                        <StackPanel.InputBindings>
-                                            <MouseBinding
-                                                Command="{s:Action ExportChannel}"
-                                                CommandParameter="{Binding}"
-                                                MouseAction="LeftClick" />
-                                        </StackPanel.InputBindings>
                                         <materialDesign:PackIcon
                                             Margin="16,7,0,6"
                                             VerticalAlignment="Center"
@@ -257,9 +256,9 @@
                                             Margin="3,8,8,8"
                                             VerticalAlignment="Center"
                                             FontSize="14">
-                                            <Run Text="{Binding Category, Mode=OneWay}" Foreground="{DynamicResource SecondaryTextBrush}" />
-                                            <Run Text="/" Foreground="{DynamicResource SecondaryTextBrush}" />
-                                            <Run Text="{Binding Model.Name, Mode=OneWay}" Foreground="{DynamicResource PrimaryTextBrush}" />
+                                            <Run Foreground="{DynamicResource SecondaryTextBrush}" Text="{Binding Category, Mode=OneWay}" />
+                                            <Run Text="/" />
+                                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding Model.Name, Mode=OneWay}" />
                                         </TextBlock>
                                     </StackPanel>
                                 </DataTemplate>
@@ -268,6 +267,20 @@
                     </Border>
                 </Grid>
 
+                <!--  Export button  -->
+                <Button
+                    Margin="32,24"
+                    HorizontalAlignment="Right"
+                    VerticalAlignment="Bottom"
+                    Command="{s:Action ExportChannels}"
+                    Style="{StaticResource MaterialDesignFloatingActionAccentButton}"
+                    Visibility="{Binding IsEnabled, RelativeSource={RelativeSource Self}, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
+                    <materialDesign:PackIcon
+                        Width="32"
+                        Height="32"
+                        Kind="Download" />
+                </Button>
+
                 <!--  Notifications snackbar  -->
                 <materialDesign:Snackbar MessageQueue="{Binding Notifications}" />
             </Grid>

Readme.md

@@ -33,7 +33,9 @@ DiscordChatExporter can be used to export message history from a [Discord](https
 - [Newtonsoft.Json](http://www.newtonsoft.com/json)
 - [Scriban](https://github.com/lunet-io/scriban)
 - [CommandLineParser](https://github.com/commandlineparser/commandline)
+- [Ookii.Dialogs](https://github.com/caioproiete/ookii-dialogs-wpf)
 - [Failsafe](https://github.com/Tyrrrz/Failsafe)
+- [Gress](https://github.com/Tyrrrz/Gress)
 - [Onova](https://github.com/Tyrrrz/Onova)
 - [Tyrrrz.Extensions](https://github.com/Tyrrrz/Extensions)
 - [Tyrrrz.Settings](https://github.com/Tyrrrz/Settings)