feature<Preference>: add custom font settings

src/Models/InstalledFonts.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Markup;
+using System.Windows.Media;
+
+namespace SourceGit.Models {
+    public class InstalledFont {
+        public string Name { get; set; }
+        public int FamilyIndex { get; set; }
+
+        public static List<InstalledFont> GetFonts {
+            get {
+                var fontList = new List<InstalledFont>();
+
+                var fontCollection = Fonts.SystemFontFamilies;
+                var familyCount = fontCollection.Count;
+
+                for (int i = 0; i < familyCount; i++) {
+                    var fontFamily = fontCollection.ElementAt(i);
+                    var familyNames = fontFamily.FamilyNames;
+
+                    if (!familyNames.TryGetValue(XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.Name), out var name)) {
+                        if (!familyNames.TryGetValue(XmlLanguage.GetLanguage("en-us"), out name)) {
+                            name = familyNames.FirstOrDefault().Value;
+                        }
+                    }
+
+                    fontList.Add(new InstalledFont() {
+                        Name = name,
+                        FamilyIndex = i
+                    });
+                }
+
+                fontList.Sort((p, n) => string.Compare(p.Name, n.Name, StringComparison.Ordinal));
+
+                return fontList;
+            }
+        }
+    }
+}

src/Models/Preference.cs

@@ -27,6 +27,27 @@ namespace SourceGit.Models {
             /// </summary>
             public string Locale { get; set; } = "en_US";
 
+            /// <summary>
+            ///     系统字体
+            /// </summary>
+            public string FontFamilyWindowSetting { get; set; } = "Microsoft YaHei UI";
+
+            [JsonIgnore]
+            public string FontFamilyWindow {
+                get => FontFamilyWindowSetting + ",Microsoft YaHei UI";
+                set => FontFamilyWindowSetting = value;
+            }
+
+            /// <summary>
+            ///     用户字体（提交列表、提交日志、差异比较等）
+            /// </summary>
+            public string FontFamilyContentSetting { get; set; } = "Consolas";
+
+            [JsonIgnore] public string FontFamilyContent {
+                get => FontFamilyContentSetting + ",Microsoft YaHei UI";
+                set => FontFamilyContentSetting = value;
+            }
+
             /// <summary>
             ///     头像服务器
             /// </summary>