Custom input bar

FileSystemSuggestions.cs

@@ -0,0 +1,184 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Diagnostics.CodeAnalysis;
+
+namespace HashCalculator.GUI
+{
+    internal class FileSystemSuggestions
+    {
+        private static readonly Dictionary<string, InputEntryType> Mapping = new Dictionary<string, InputEntryType>(StringComparer.OrdinalIgnoreCase)
+        {
+            { ".big", InputEntryType.BigFile },
+            { ".xml", InputEntryType.XmlFile },
+            { ".w3x", InputEntryType.XmlFile },
+            { ".manifest", InputEntryType.ManifestFile },
+        };
+
+        private Search _search = new Search();
+
+        [SuppressMessage("Microsoft.Performance", "CA1031")]
+        public IEnumerable<InputEntry> ProvideFileSystemSuggestions(string? path)
+        {
+            var empty = Enumerable.Empty<InputEntry>();
+
+            if (string.IsNullOrWhiteSpace(path) || path == null)
+            {
+                return empty;
+            }
+
+            path = Environment.ExpandEnvironmentVariables(path);
+
+            _search.Update(path);
+
+            if (!_search.IsValidPath)
+            {
+                return empty;
+            }
+
+            var currentFiles = empty;
+            string? fileName;
+            string? currentFullPath;
+            try
+            {
+                currentFullPath = Path.GetFullPath(path);
+                fileName = Path.GetFileName(path);
+                if (File.Exists(currentFullPath))
+                {
+
+                    var type = CheckExtension(currentFullPath);
+                    if (type.HasValue)
+                    {
+                        currentFiles.Append(new InputEntry(type.Value, path, currentFullPath));
+                    }
+                    currentFiles.Append(new InputEntry(InputEntryType.BinaryFile, path, currentFullPath));
+                }
+            }
+            catch
+            {
+                return empty;
+            }
+
+            var directories = from directory in _search.AllDirectories
+                              where directory.Name.StartsWith(fileName, StringComparison.OrdinalIgnoreCase)
+                              select new InputEntry(InputEntryType.Path, _search.GetInputStyleName(directory), directory.FullName);
+
+            var otherFiles = from file in _search.AllFiles
+                             where file.Name.StartsWith(fileName, StringComparison.OrdinalIgnoreCase)
+                             where file.FullName != currentFullPath
+                             select file;
+
+            var supportedFiles = empty;
+            try
+            {
+                supportedFiles = from file in otherFiles
+                                 let type = CheckExtension(file.Extension)
+                                 where type.HasValue
+                                 select new InputEntry(type.Value, _search.GetInputStyleName(file), file.FullName);
+            }
+            catch { }
+
+            var binaryFiles = empty;
+            try
+            {
+                binaryFiles = from file in otherFiles
+                              select new InputEntry(InputEntryType.BinaryFile, _search.GetInputStyleName(file), file.FullName);
+            }
+            catch { }
+
+            return currentFiles.Concat(supportedFiles).Concat(directories).Concat(binaryFiles);
+        }
+
+        private static InputEntryType? CheckExtension(string path)
+        {
+            if (Mapping.TryGetValue(path, out var type))
+            {
+                return type;
+            }
+
+            return null;
+        }
+    }
+
+    internal sealed class Search
+    {
+        private string? _inputBaseDirectory;
+        public bool IsValidPath => _inputBaseDirectory != null;
+        public IEnumerable<DirectoryInfo> AllDirectories { get; private set; }
+        public IEnumerable<FileInfo> AllFiles { get; private set; }
+
+        public Search()
+        {
+            AllDirectories = Array.Empty<DirectoryInfo>();
+            AllFiles = Array.Empty<FileInfo>();
+        }
+
+        public string GetInputStyleName(FileSystemInfo entry)
+        {
+            if (_inputBaseDirectory == null)
+            {
+                throw new InvalidOperationException();
+            }
+
+            return Path.Combine(_inputBaseDirectory, entry.Name);
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1031")]
+        public void Update(string path)
+        {
+            string? newBaseDirectory = null;
+            try
+            {
+                newBaseDirectory = Path.GetDirectoryName(path);
+                var rootDirectory = Path.GetPathRoot(path);
+                if(string.IsNullOrEmpty(newBaseDirectory) && !string.IsNullOrEmpty(rootDirectory))
+                {
+                    var last = rootDirectory.LastOrDefault();
+                    if (last != Path.DirectorySeparatorChar && last != Path.AltDirectorySeparatorChar)
+                    {
+                        rootDirectory += Path.DirectorySeparatorChar;
+                    }
+                    newBaseDirectory = rootDirectory;
+                }
+            }
+            catch
+            {
+                _inputBaseDirectory = null;
+            }
+
+            if (newBaseDirectory == null)
+            {
+                return;
+            }
+
+            if (newBaseDirectory == _inputBaseDirectory)
+            {
+                return;
+            }
+
+            _inputBaseDirectory = newBaseDirectory;
+            Update();
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1031")]
+        private void Update()
+        {
+            AllDirectories = Enumerable.Empty<DirectoryInfo>();
+            AllFiles = Enumerable.Empty<FileInfo>();
+            try
+            {
+                var actualPath = _inputBaseDirectory!.Length == 0
+                    ? "."
+                    : _inputBaseDirectory;
+                var directory = new DirectoryInfo(actualPath);
+                if (directory.Exists)
+                {
+                    AllDirectories = directory.EnumerateDirectories();
+                    AllFiles = directory.EnumerateFiles();
+                }
+            }
+            catch { }
+        }
+    }
+}

HashCalculator.GUI.csproj

@@ -2,14 +2,25 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net461</TargetFramework>
+    <TargetFramework>net472</TargetFramework>
     <RootNamespace>HashCalculator.GUI</RootNamespace>
     <LangVersion>8.0</LangVersion>
     <Nullable>enable</Nullable>
     <UseWPF>true</UseWPF>
+    <Platforms>AnyCPU;x86</Platforms>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="DotNetKit.Wpf.AutoCompleteComboBox" Version="1.2.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="TechnologyAssembler.Core">
+      <HintPath>TechnologyAssembler.Core.dll</HintPath>
+      <Private>true</Private>
+    </Reference>
   </ItemGroup>
 </Project>

InputBar.xaml

@@ -0,0 +1,115 @@
+<UserControl 
+    x:Class="HashCalculator.GUI.InputBar"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+    xmlns:local="clr-namespace:HashCalculator.GUI"
+    mc:Ignorable="d" 
+    x:ClassModifier="internal"
+    x:Name="_this"
+    d:DesignHeight="100" d:DesignWidth="800"
+>
+    <UserControl.Resources>
+        <local:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
+        <Style 
+            x:Key="BlankListBoxContainerStyle" 
+            TargetType="{x:Type ListBoxItem}"
+        >
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="ListBoxItem">
+                        <Border 
+                            Name="Border"
+                            Padding="3, 2"
+                            SnapsToDevicePixels="true"
+                        >
+                            <ContentPresenter />
+                        </Border>
+                        <ControlTemplate.Triggers>
+                            <Trigger 
+                                Property="IsSelected" 
+                                Value="true"
+                            >
+                                <Setter 
+                                    TargetName="Border" 
+                                    Property="Background"
+                                    Value="DarkSlateGray"
+                                />
+                                <Setter 
+                                    Property="Foreground" 
+                                    Value="White"
+                                />
+                            </Trigger>
+                            <Trigger 
+                                Property="IsMouseOver" 
+                                Value="true"
+                            >
+                                <Setter 
+                                    TargetName="Border" 
+                                    Property="Background"
+                                    Value="DarkSlateGray"
+                                />
+                                <Setter 
+                                    Property="Foreground" 
+                                    Value="White"
+                                />
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+    </UserControl.Resources>
+    <Grid>
+        <!--TextChanged="OnTextChanged"-->
+        <Grid>
+            <TextBox 
+                x:Name="TextBox"
+                Text="{Binding Path=Text, 
+                               RelativeSource={RelativeSource AncestorType=local:InputBar},
+                               UpdateSourceTrigger=PropertyChanged}"
+                PreviewKeyDown="OnPreviewKeyDown"
+                Padding="2, 0"
+                VerticalContentAlignment="Center"
+                TextChanged="OnTextChanged"
+                LostFocus="OnLostFocus"
+            />
+            <TextBlock 
+                Text="{Binding Path=HintText, 
+                               RelativeSource={RelativeSource AncestorType=local:InputBar}}"
+                IsHitTestVisible="False"
+                Visibility="{Binding ElementName=TextBox, Path=Text, Converter={StaticResource NullToVisibilityConverter}}"
+                Padding="5, 0"
+                VerticalAlignment="Center"
+            />
+        </Grid>
+        <Popup
+            x:Name="DropDown"
+            StaysOpen="False"
+            MaxHeight="400"
+            Width="{Binding ElementName=TextBox, Path=ActualWidth}"
+            ScrollViewer.VerticalScrollBarVisibility="Auto"
+        >
+            <ListBox 
+                x:Name="ListBox"
+                ItemContainerStyle="{StaticResource ResourceKey=BlankListBoxContainerStyle}"
+                ItemsSource="{Binding Path=Collection, 
+                                      RelativeSource={RelativeSource AncestorType=local:InputBar}}"
+                SelectionMode="Single"
+                SelectionChanged="OnSelectionChanged"
+                VirtualizingPanel.IsVirtualizing="True"
+                VirtualizingPanel.VirtualizationMode="Recycling"
+            >
+                <ListBox.ItemTemplate>
+                    <DataTemplate>
+                        <StackPanel Orientation="Vertical">
+                            <TextBlock Text="{Binding Text}" FontWeight="Bold"></TextBlock>
+                            <TextBlock Text="{Binding Type}"></TextBlock>
+                        </StackPanel>
+                    </DataTemplate>
+                </ListBox.ItemTemplate>
+            </ListBox>
+        </Popup>
+    </Grid>
+</UserControl>

InputBar.xaml.cs

@@ -0,0 +1,150 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using System.Diagnostics;
+
+namespace HashCalculator.GUI
+{
+    /// <summary>
+    /// InputBar.xaml 的交互逻辑
+    /// </summary>
+    [SuppressMessage("Microsoft.Performance", "CA1812")]
+    internal partial class InputBar : UserControl
+    {
+        public static readonly DependencyProperty HintTextProperty =
+            DependencyProperty.Register(nameof(HintText), typeof(string), typeof(InputBar), new FrameworkPropertyMetadata
+            {
+                BindsTwoWayByDefault = true,
+                DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
+            });
+        public string? HintText
+        {
+            get => GetValue(HintTextProperty) as string;
+            set => SetValue(HintTextProperty, value);
+        }
+
+        public static readonly DependencyProperty TextProperty =
+            DependencyProperty.Register(nameof(Text), typeof(string), typeof(InputBar), new FrameworkPropertyMetadata
+            {
+                BindsTwoWayByDefault = true,
+                DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
+            });
+        public string? Text
+        {
+            get => GetValue(TextProperty) as string;
+            set => SetValue(TextProperty, value);
+        }
+
+        public static readonly DependencyProperty CollectionProperty =
+            DependencyProperty.Register(nameof(Collection), typeof(IEnumerable<InputEntry>), typeof(InputBar), new FrameworkPropertyMetadata
+            {
+                BindsTwoWayByDefault = true,
+                DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
+                CoerceValueCallback = (d, baseObject) =>
+                {
+                    var value = baseObject as IEnumerable<InputEntry>;
+                    if (value?.Count() > 100)
+                    {
+                        value = value
+                            .Take(99)
+                            .Append(new InputEntry(InputEntryType.Path, $"Other {value.Count() - 50} items...", string.Empty));
+                    }
+                    return value;
+                }
+            });
+        public IEnumerable<InputEntry>? Collection
+        {
+            get => GetValue(CollectionProperty) as IEnumerable<InputEntry>;
+            set => SetValue(CollectionProperty, value);
+        }
+
+        public static readonly DependencyProperty SelectedItemProperty =
+            DependencyProperty.Register(nameof(SelectedItem), typeof(InputEntry), typeof(InputBar), new FrameworkPropertyMetadata
+            {
+                BindsTwoWayByDefault = true,
+                DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
+            });
+        public InputEntry? SelectedItem
+        {
+            get => GetValue(SelectedItemProperty) as InputEntry;
+            set => SetValue(SelectedItemProperty, value);
+        }
+
+        public event TextChangedEventHandler? TextChanged;
+
+        public InputBar()
+        {
+            InitializeComponent();
+        }
+
+        private void OnPreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            switch (e.Key)
+            {
+                case Key.Down:
+                    ListBox.SelectedIndex = NormalizeIndex(ListBox.SelectedIndex + 1);
+                    ListBox.ScrollIntoView(ListBox.SelectedItem);
+                    DropDown.IsOpen = true;
+                    break;
+                case Key.Up:
+                    ListBox.SelectedIndex = NormalizeIndex(ListBox.SelectedIndex - 1);
+                    ListBox.ScrollIntoView(ListBox.SelectedItem);
+                    break;
+                case Key.Escape:
+                case Key.Enter:
+                    DropDown.IsOpen = false;
+                    break;
+                default:
+                    DropDown.IsOpen = true;
+                    break;
+            }
+        }
+
+        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            SelectedItem = (InputEntry)ListBox.SelectedItem;
+            if (SelectedItem != null)
+            {
+                Text = SelectedItem.ToString();
+                TextBox.Select(Text.Length, 0);
+            }
+        }
+
+        private void OnTextChanged(object sender, TextChangedEventArgs e)
+        {
+            if (Text != SelectedItem?.ToString())
+            {
+                TextChanged?.Invoke(this, e);
+            }
+        }
+
+        private void OnLostFocus(object sender, RoutedEventArgs e)
+        {
+            DropDown.IsOpen = false;
+        }
+
+        private int NormalizeIndex(int rawIndex)
+        {
+            if (Collection == null)
+            {
+                return -1;
+            }
+
+            return Math.Min(Math.Max(rawIndex, -1), Collection.Count() - 1);
+        }
+
+
+    }
+}

InputEntry.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+
+using System.Text;
+using System.Threading.Tasks;
+using TechnologyAssembler.Core.IO;
+
+namespace HashCalculator.GUI
+{
+    internal enum InputEntryType
+    {
+        Text,
+        BigFile,
+        ManifestFile,
+        XmlFile,
+        BinaryFile,
+        Path,
+    }
+
+    internal sealed class InputEntry
+    {
+        public InputEntryType Type { get; }
+        public string Value { get; }
+        public string Text { get; }
+
+        public InputEntry(InputEntryType type, string text, string value)
+        {
+            Type = type;
+            Text = text;
+            Value = value;
+        }
+
+        public override string ToString()
+        {
+            return Text;
+        }
+
+    }
+}

MainWindow.xaml

@@ -3,10 +3,12 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:dotNetKitControls="clr-namespace:DotNetKit.Windows.Controls;assembly=DotNetKit.Wpf.AutoCompleteComboBox"
         xmlns:l="clr-namespace:HashCalculator.GUI"
         mc:Ignorable="d"
         Title="Sage FastHash 哈希计算器" Height="600" Width="600">
+    <Window.Resources>
+        <l:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
+    </Window.Resources>
     <Grid Margin="10, 10">
         <Grid.RowDefinitions>
             <RowDefinition/>
@@ -18,36 +20,35 @@
                     <ColumnDefinition />
                     <ColumnDefinition Width="92"/>
                 </Grid.ColumnDefinitions>
-                <dotNetKitControls:AutoCompleteComboBox
+                <Grid>
-                    SelectedValuePath="Id"
+                    <!--<l:InputBox
-                    TextSearch.TextPath="Name"
+                        HintText="Select some big file"
-                    Text="输入任意字符串来计算它的哈希值，也可以输入big/manifest/xml文件的路径"
+                        Collection="{Binding Items}"
-                    ItemsSource="{Binding Items}"
+                        TextChanged="OnTextChanged"
-                    SelectedItem="{Binding SelectedItem}"
+                    >
-                    SelectedValue="{Binding SelectedValue}" 
+                    </l:InputBox>-->
-                    Grid.Column="0" Margin="0"
+                    <l:InputBar
+                        HintText="Select some big file"
+                        Text="{Binding Text}"
+                        Collection="{Binding Items}"
+                        TextChanged="OnTextChanged"
                     />
+                </Grid>
                 <Button x:Name="button" Content="浏览文件" 
                     Grid.Column="1" Margin="0"
                 />
             </Grid>
-            <dotNetKitControls:AutoCompleteComboBox
+            <l:InputBar
-                SelectedValuePath="Id"
+                HintText="输入big文件里包含的manifest文件的路径"
-                TextSearch.TextPath="Name"
+                Collection="{Binding Items}"
-                Text="输入big文件里包含的manifest文件的路径"
-                ItemsSource="{Binding Items}"
                 SelectedItem="{Binding SelectedItem}"
-                SelectedValue="{Binding SelectedValue}" 
                 Margin="0,10,0,0"
                 Height="25" VerticalAlignment="Top"
             />
-            <dotNetKitControls:AutoCompleteComboBox
+            <l:InputBar
-                SelectedValuePath="Id"
+                HintText="过滤Asset ID（可选）"
-                TextSearch.TextPath="Name"
+                Collection="{Binding Items}"
-                Text="过滤Asset ID（可选）"
-                ItemsSource="{Binding Items}"
                 SelectedItem="{Binding SelectedItem}"
-                SelectedValue="{Binding SelectedValue}" 
                 Margin="0,10,0,0"
                 Height="25" VerticalAlignment="Top"
             />

MainWindow.xaml.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.ComponentModel;
-using System.IO;
 using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Text;
@@ -23,19 +23,40 @@ namespace HashCalculator.GUI
     /// </summary>
     public partial class MainWindow : Window
     {
+        private readonly FileSystemSuggestions _suggestions = new FileSystemSuggestions();
+        private readonly ViewModel _model = new ViewModel();
 
         public MainWindow()
         {
             InitializeComponent();
-            DataContext = new ViewModel();
+            DataContext = _model;
+        }
+
+        private void OnTextChanged(object sender, TextChangedEventArgs e)
+        {
+            if (sender is InputBar)
+            {
+                var inputValue = _model.Text;
+                if(inputValue != null)
+                {
+                    _model.Items = _suggestions.ProvideFileSystemSuggestions(inputValue)
+                        .Prepend(new InputEntry(InputEntryType.Text, inputValue, inputValue));
+                }
+            }
         }
     }
 
-    internal sealed class ViewModel : INotifyPropertyChanged
+    internal class ViewModel : INotifyPropertyChanged
     {
         #region INotifyPropertyChanged
         public event PropertyChangedEventHandler? PropertyChanged;
 
+        private void Notify(string name)
+        {
+            System.Diagnostics.Debug.WriteLine($"Updating {name}");
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+        }
+
         private void SetField<X>(ref X field, X value, [CallerMemberName] string? propertyName = null)
         {
             if (propertyName == null)
@@ -50,104 +71,37 @@ namespace HashCalculator.GUI
 
             field = value;
 
-            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+            Notify(propertyName);
         }
         #endregion
 
-        public IReadOnlyList<Person> Items
+        private IEnumerable<InputEntry>? _items;
+        public IEnumerable<InputEntry>? Items
         {
-            get { return PersonModule.All; }
+            get => _items;
+            set => SetField(ref _items, value);
         }
 
-        Person selectedItem;
+        private InputEntry? selectedItem;
-        public Person SelectedItem
+        public InputEntry? SelectedItem
         {
             get { return selectedItem; }
             set { SetField(ref selectedItem, value); }
         }
 
-        long? selectedValue;
+        private string? selectedValue;
-        public long? SelectedValue
+        public string? SelectedValue
         {
             get { return selectedValue; }
             set { SetField(ref selectedValue, value); }
         }
+
+        private string? _text;
+        public string? Text
+        {
+            get { return _text; }
+            set { SetField(ref _text, value); }
+        }
     }
 
-    internal enum InputEntryType
-    {
-        Text,
-        SupportedFilePath,
-        BinaryFilePath,
-        Path,
-    }
-
-    internal sealed class InputEntry
-    {
-        public InputEntryType Type { get; }
-        public string Value { get; }
-
-        public InputEntry(InputEntryType type, string value)
-        {
-            Type = type;
-            Value = value;
-        }
-
-        public static List<InputEntry> CreateSuggestion(string value)
-        {
-            var list = new List<InputEntry>();
-            try
-            {
-                var path = new FileInfo(value);
-                path.Directory.GetFiles()
-            }
-            catch { }
-            
-        }
-
-        public static bool IsSupportedFile(string value)
-        {
-
-        }
-
-        public static IEnumerable<InputEntry> ProvideFileSystemSuggestions(string path)
-        {
-            var empty = Enumerable.Empty<InputEntry>();
-            var list = empty;
-
-            if (string.IsNullOrWhiteSpace(path))
-            {
-                return list;
-            }
-
-            var directories = empty;
-            try
-            {
-                var directoryInfo = new DirectoryInfo(path);
-                if (directoryInfo.Exists)
-                {
-                    directories = directoryInfo.GetDirectories()
-                        .Select(info => new InputEntry(InputEntryType.Path, info.FullName));
-                }
-            }
-            catch { }
-
-            var files = empty;
-            try
-            {
-                var fileInfo = new FileInfo(path);
-                if (fileInfo.Exists)
-                {
-                    files = files.Concat()
-                }
-                if (fileInfo.Directory.Exists)
-                {
-                    
-                }
-
-                //fileInfo.Directory.get
-            }
-            catch { }
-        }
-    }
 }

NullToVisibilityConverter.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace HashCalculator.GUI
+{
+    [ValueConversion(typeof(string), typeof(Visibility))]
+    public class NullToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var text = value as string;
+            return string.IsNullOrEmpty(text) ? Visibility.Visible : Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

ShellLink.cs

@@ -1,12 +1,14 @@
 using System.Diagnostics;
 using System.Windows.Documents;
 using System.Windows.Navigation;
+using System.Diagnostics.CodeAnalysis;
 
 namespace HashCalculator.GUI
 {
     /// <summary>
     /// Opens <see cref="Hyperlink.NavigateUri"/> in a default system browser
     /// </summary>
+    [SuppressMessage("Microsoft.Performance", "CA1812")]
     internal sealed class ShellLink : Hyperlink
     {
         public ShellLink()