enhance: use custom JsonConverter instead of converting string to FontFamily in each control

src/SourceGit/App.axaml.cs

@@ -179,11 +179,6 @@ namespace SourceGit
 
             SetLocale(pref.Locale);
             SetTheme(pref.Theme);
-
-            if (string.IsNullOrEmpty(pref.DefaultFont))
-            {
-                pref.DefaultFont = FontManager.Current.DefaultFontFamily.ToString();
-            }
         }
 
         public override void OnFrameworkInitializationCompleted()

src/SourceGit/Converters/StringConverters.cs

@@ -70,29 +70,5 @@ namespace SourceGit.Converters
 
         public static FuncValueConverter<string, string> ToShortSHA =
             new FuncValueConverter<string, string>(v => v.Length > 10 ? v.Substring(0, 10) : v);
-
-        public class ToFontFamilyConverter : IValueConverter
-        {
-            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
-            {
-                var name = value as string;
-                if (string.IsNullOrEmpty(name))
-                {
-                    return FontManager.Current.DefaultFontFamily;
-                }
-                else
-                {
-                    return new FontFamily(name);
-                }
-            }
-
-            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
-            {
-                var fontFamily = value as FontFamily;
-                return fontFamily == null ? string.Empty : fontFamily.ToString();
-            }
-        }
-
-        public static ToFontFamilyConverter ToFontFamily = new ToFontFamilyConverter();
     }
 }

src/SourceGit/Resources/Styles.axaml

@@ -16,7 +16,7 @@
   </Style>
 
   <Style Selector="ContentPresenter">
-    <Setter Property="FontFamily" Value="{Binding Source={x:Static vm:Preference.Instance}, Path=DefaultFont, Converter={x:Static c:StringConverters.ToFontFamily}}"/>
+    <Setter Property="FontFamily" Value="{Binding Source={x:Static vm:Preference.Instance}, Path=DefaultFont}"/>
   </Style>
 
   <Style Selector="Path">
@@ -70,7 +70,7 @@
     <Setter Property="FontStyle" Value="Italic"/>
   </Style>
   <Style Selector="TextBlock.monospace">
-    <Setter Property="FontFamily" Value="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"/>
+    <Setter Property="FontFamily" Value="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"/>
   </Style>
   <Style Selector="TextBlock.group_header_label">
     <Setter Property="Foreground" Value="{DynamicResource Brush.FG2}"/>

src/SourceGit/ViewModels/Preference.cs

@@ -5,6 +5,7 @@ using System.Text.Json;
 using System.Text.Json.Serialization;
 
 using Avalonia.Collections;
+using Avalonia.Media;
 
 using CommunityToolkit.Mvvm.ComponentModel;
 
@@ -38,6 +39,16 @@ namespace SourceGit.ViewModels
 
                 _instance.Repositories.RemoveAll(x => !Directory.Exists(x.FullPath));
 
+                if (_instance.DefaultFont == null)
+                {
+                    _instance.DefaultFont = FontManager.Current.DefaultFontFamily;
+                }
+
+                if (_instance.MonospaceFont == null)
+                {
+                    _instance.MonospaceFont = new FontFamily("fonts:SourceGit#JetBrains Mono");
+                }
+
                 if (!_instance.IsGitConfigured)
                 {
                     _instance.GitInstallPath = Native.OS.FindGitExecutable();
@@ -71,13 +82,15 @@ namespace SourceGit.ViewModels
             }
         }
 
-        public string DefaultFont
+        [JsonConverter(typeof(FontFamilyConverter))]
+        public FontFamily DefaultFont
         {
             get => _defaultFont;
             set => SetProperty(ref _defaultFont, value);
         }
 
-        public string MonospaceFont
+        [JsonConverter(typeof(FontFamilyConverter))]
+        public FontFamily MonospaceFont
         {
             get => _monospaceFont;
             set => SetProperty(ref _monospaceFont, value);
@@ -364,8 +377,8 @@ namespace SourceGit.ViewModels
 
         private string _locale = "en_US";
         private string _theme = "Default";
-        private string _defaultFont = string.Empty;
+        private FontFamily _defaultFont = null;
-        private string _monospaceFont = "fonts:SourceGit#JetBrains Mono";
+        private FontFamily _monospaceFont = null;
 
         private int _maxHistoryCommits = 20000;
         private bool _restoreTabs = false;
@@ -388,6 +401,20 @@ namespace SourceGit.ViewModels
         private AvaloniaList<RepositoryNode> _repositoryNodes = new AvaloniaList<RepositoryNode>();
     }
 
+    public class FontFamilyConverter : JsonConverter<FontFamily>
+    {
+        public override FontFamily Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var name = reader.GetString();
+            return new FontFamily(name);
+        }
+
+        public override void Write(Utf8JsonWriter writer, FontFamily value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(value.ToString());
+        }
+    }
+
     [JsonSourceGenerationOptions(WriteIndented = true, IgnoreReadOnlyFields = true, IgnoreReadOnlyProperties = true)]
     [JsonSerializable(typeof(Preference))]
     internal partial class JsonSerializationCodeGen : JsonSerializerContext { }

src/SourceGit/Views/Blame.axaml

@@ -72,7 +72,7 @@
                          BorderThickness="1"
                          Background="{DynamicResource Brush.Contents}"
                          Foreground="{DynamicResource Brush.FG1}"
-                         FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"
+                         FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"
                          FontSize="12"
                          BlameData="{Binding Data}"/>
       

src/SourceGit/Views/CommitBaseInfo.axaml

@@ -43,7 +43,7 @@
         <Grid RowDefinitions="24,Auto,Auto,Auto" ColumnDefinitions="96,*">
           <!-- SHA -->
           <TextBlock Grid.Row="0" Grid.Column="0" Classes="info_label" Text="{DynamicResource Text.CommitDetail.Info.SHA}" />
-          <SelectableTextBlock Grid.Row="0" Grid.Column="1" Text="{Binding SHA}" Margin="12,0,0,0" FontSize="12" VerticalAlignment="Center" FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"/>
+          <SelectableTextBlock Grid.Row="0" Grid.Column="1" Text="{Binding SHA}" Margin="12,0,0,0" FontSize="12" VerticalAlignment="Center" FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"/>
 
           <!-- PARENTS -->
           <TextBlock Grid.Row="1" Grid.Column="0" Classes="info_label" Text="{DynamicResource Text.CommitDetail.Info.Parents}" IsVisible="{Binding Parents.Count, Converter={x:Static c:IntConverters.IsGreaterThanZero}}"/>
@@ -95,7 +95,7 @@
           <!-- Messages -->
           <TextBlock Grid.Row="3" Grid.Column="0" Classes="info_label" Text="{DynamicResource Text.CommitDetail.Info.Message}" VerticalAlignment="Top" Margin="0,4,0,0" />
           <ScrollViewer Grid.Row="3" Grid.Column="1" Margin="12,5,0,0" MaxHeight="100" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
-            <SelectableTextBlock Text="{Binding FullMessage}" FontSize="12" FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}" TextWrapping="Wrap"/>
+            <SelectableTextBlock Text="{Binding FullMessage}" FontSize="12" FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}" TextWrapping="Wrap"/>
           </ScrollViewer>
         </Grid>
 

src/SourceGit/Views/Preference.axaml

@@ -121,7 +121,7 @@
                       Padding="8,0"
                       HorizontalAlignment="Stretch"
                       ItemsSource="{Binding #me.InstalledFonts}"
-                      SelectedItem="{Binding DefaultFont, Converter={x:Static c:StringConverters.ToFontFamily}, Mode=TwoWay}">
+                      SelectedItem="{Binding DefaultFont, Mode=TwoWay}">
               <ComboBox.ItemTemplate>
                 <DataTemplate DataType="FontFamily">
                   <Border Height="24">
@@ -140,7 +140,7 @@
                       Padding="8,0"
                       HorizontalAlignment="Stretch"
                       ItemsSource="{Binding #me.InstalledMonospaceFonts}"
-                      SelectedItem="{Binding MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}, Mode=TwoWay}">
+                      SelectedItem="{Binding MonospaceFont, Mode=TwoWay}">
               <ComboBox.ItemTemplate>
                 <DataTemplate DataType="FontFamily">
                   <Border Height="24">

src/SourceGit/Views/Preference.axaml.cs

@@ -69,17 +69,19 @@ namespace SourceGit.Views
             var pref = ViewModels.Preference.Instance;
             DataContext = pref;
 
+            var builtInMono = new FontFamily("fonts:SourceGit#JetBrains Mono");
+
             InstalledFonts = new AvaloniaList<FontFamily>();
-            InstalledFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));
+            InstalledFonts.Add(builtInMono);
             InstalledFonts.AddRange(FontManager.Current.SystemFonts);
 
             InstalledMonospaceFonts = new AvaloniaList<FontFamily>();
-            InstalledMonospaceFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));
+            InstalledMonospaceFonts.Add(builtInMono);
 
             var curMonoFont = pref.MonospaceFont;
-            if (!string.IsNullOrEmpty(curMonoFont) && curMonoFont != "fonts:SourceGit#JetBrains Mono")
+            if (curMonoFont != builtInMono)
             {
-                InstalledMonospaceFonts.Add(new FontFamily(curMonoFont));
+                InstalledMonospaceFonts.Add(curMonoFont);
             }
 
             Task.Run(() =>
@@ -87,7 +89,7 @@ namespace SourceGit.Views
                 var sysMonoFonts = new List<FontFamily>();
                 foreach (var font in FontManager.Current.SystemFonts)
                 {
-                    if (font.ToString() == curMonoFont) continue;
+                    if (font == curMonoFont) continue;
 
                     var typeface = new Typeface(font);
                     var testI = new FormattedText(

src/SourceGit/Views/RevisionFiles.axaml

@@ -89,7 +89,7 @@
             </DataTemplate>
 
             <DataTemplate DataType="m:RevisionTextFile">
-              <v:RevisionTextFileView FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}" FontSize="12" Background="{DynamicResource Brush.Contents}"/>
+              <v:RevisionTextFileView FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}" FontSize="12" Background="{DynamicResource Brush.Contents}"/>
             </DataTemplate>
 
             <DataTemplate DataType="m:RevisionLFSObject">

src/SourceGit/Views/TextDiffView.axaml

@@ -17,7 +17,7 @@
                                    BorderThickness="0"
                                    Foreground="{DynamicResource Brush.FG1}"
                                    SecondaryFG="{DynamicResource Brush.FG2}"
-                                   FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"
+                                   FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"
                                    FontSize="12"
                                    DiffData="{Binding}"
                                    SyncScrollOffset="{Binding $parent[v:DiffView].DataContext.(vm:DiffContext).SyncScrollOffset, Mode=TwoWay}"
@@ -36,7 +36,7 @@
                                        BorderThickness="0"
                                        Foreground="{DynamicResource Brush.FG1}"
                                        SecondaryFG="{DynamicResource Brush.FG2}"
-                                       FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"
+                                       FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"
                                        FontSize="12"
                                        DiffData="{Binding}"/>
 
@@ -52,7 +52,7 @@
                                        BorderThickness="0"
                                        Foreground="{DynamicResource Brush.FG1}"
                                        SecondaryFG="{DynamicResource Brush.FG2}"
-                                       FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont, Converter={x:Static c:StringConverters.ToFontFamily}}"
+                                       FontFamily="{Binding Source={x:Static vm:Preference.Instance}, Path=MonospaceFont}"
                                        FontSize="12"
                                        DiffData="{Binding}"/>
       </Grid>