maksit-postclient/src/MaksIT.PostClient.UI/Views/Mail/FolderPaneView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:layout="using:MaksIT.PostClient.UI.Layout"
             xmlns:vm="using:MaksIT.PostClient.UI.ViewModels"
             x:Class="MaksIT.PostClient.UI.Views.Mail.FolderPaneView"
             x:DataType="vm:MainViewModel"
             layout:LayoutMemento.PaneRole="Folder">
  <layout:LayoutMemento.Band>
    <layout:LayoutBand Slot="FolderWidth" Min="160" Max="900" Fallback="248" />
  </layout:LayoutMemento.Band>
  <DockPanel Background="#121416">
    <TextBlock DockPanel.Dock="Top" Text="{Binding Copy.Folders}" Classes="kicker" Margin="12,10,12,6" />
    <TreeView x:Name="FolderTree"
              ItemsSource="{Binding FolderTree}"
              SelectionMode="Multiple"
              SelectionChanged="OnSelectionChanged"
              ContextRequested="OnContextRequested"
              DragDrop.AllowDrop="True"
              DragDrop.DragOver="OnDragOver"
              DragDrop.Drop="OnDrop"
              layout:LayoutMemento.PersistFolders="True"
              Margin="4,0,4,8">
      <TreeView.ContextFlyout>
        <MenuFlyout>
          <MenuItem Header="{Binding Copy.NewFolder}"
                    Command="{Binding CreateFolderCommand}"
                    IsVisible="{Binding ShowFolderContext}" />
          <MenuItem Header="{Binding EmptyFolderLabel}"
                    Command="{Binding EmptyFolderCommand}"
                    IsVisible="{Binding ShowFolderContext}" />
          <MenuItem Header="{Binding Copy.MarkFolderRead}"
                    Command="{Binding MarkFolderReadCommand}"
                    IsVisible="{Binding ShowFolderContext}" />
          <MenuItem Header="{Binding Copy.MarkFolderUnread}"
                    Command="{Binding MarkFolderUnreadCommand}"
                    IsVisible="{Binding ShowFolderContext}" />
          <Separator IsVisible="{Binding ShowFolderContext}" />
          <MenuItem Header="{Binding Copy.DeleteFolder}"
                    Command="{Binding DeleteCustomFolderCommand}"
                    IsVisible="{Binding ShowFolderContext}" />
          <MenuItem Header="{Binding Copy.DetachStore}"
                    Command="{Binding DetachPstCommand}"
                    IsVisible="{Binding ShowDetachPst}" />
          <MenuItem Header="{Binding Copy.MoveStore}"
                    Command="{Binding MoveStoreCommand}"
                    IsVisible="{Binding ShowDetachPst}" />
        </MenuFlyout>
      </TreeView.ContextFlyout>
      <TreeView.ItemTemplate>
        <TreeDataTemplate ItemsSource="{Binding Children}">
          <DockPanel LastChildFill="True" Margin="0,1" HorizontalAlignment="Stretch">
            <TextBlock DockPanel.Dock="Right"
                       Width="44"
                       Text="{Binding RetentionLabel}"
                       Classes="hint folder-meta"
                       TextAlignment="Right"
                       VerticalAlignment="Center"
                       Margin="0,0,4,0" />
            <TextBlock DockPanel.Dock="Right"
                       Width="40"
                       Text="{Binding UnreadLabel}"
                       Classes="unread-count folder-meta"
                       TextAlignment="Right"
                       VerticalAlignment="Center"
                       Margin="8,0,4,0" />
            <TextBlock Text="{Binding Glyph}"
                       Width="20"
                       FontSize="12"
                       VerticalAlignment="Center"
                       DockPanel.Dock="Left" />
            <StackPanel Spacing="2" VerticalAlignment="Center" Margin="0,0,4,0">
              <TextBlock Text="{Binding Title}"
                         FontWeight="{Binding Weight}"
                         TextTrimming="CharacterEllipsis"
                         ToolTip.Tip="{Binding QuotaTip}" />
              <ProgressBar Height="3"
                           Minimum="0"
                           Maximum="100"
                           Value="{Binding QuotaPercent}"
                           IsVisible="{Binding ShowQuota}" />
            </StackPanel>
          </DockPanel>
        </TreeDataTemplate>
      </TreeView.ItemTemplate>
    </TreeView>
  </DockPanel>
</UserControl>