0.2.3

小白板，天气，时钟

LanMontainDesktop/Views/Components/DateWidget.axaml.cs

@@ -4,26 +4,97 @@ using System.Globalization;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Media;
+using Avalonia.Styling;
 using Avalonia.Threading;
 using LanMontainDesktop.Services;
 
 namespace LanMontainDesktop.Views.Components;
 
-public partial class DateWidget : UserControl
+public partial class DateWidget : UserControl, IDesktopComponentWidget, ITimeZoneAwareComponentWidget
 {
     private readonly DispatcherTimer _timer = new()
     {
         Interval = TimeSpan.FromMinutes(1)
     };
+
     private static readonly LunarCalendarService LunarCalendarService = new();
 
-    private static readonly string[] ZhWeekdayHeaders = ["日", "一", "二", "三", "四", "五", "六"];
+    private static readonly string[] ZhWeekdayHeaders = ["\u65e5", "\u4e00", "\u4e8c", "\u4e09", "\u56db", "\u4e94", "\u516d"];
     private static readonly string[] EnWeekdayHeaders = ["S", "M", "T", "W", "T", "F", "S"];
 
+    private static readonly string[] ZhYiCandidates =
+    [
+        "\u796d\u7940",
+        "\u7948\u798f",
+        "\u4f1a\u53cb",
+        "\u51fa\u884c",
+        "\u6c42\u8d22",
+        "\u5f00\u5e02",
+        "\u4ea4\u6613",
+        "\u5ac1\u5a36",
+        "\u6c42\u5b66",
+        "\u4fee\u9020",
+        "\u5b89\u5e8a",
+        "\u7eb3\u91c7"
+    ];
+
+    private static readonly string[] ZhJiCandidates =
+    [
+        "\u52a8\u571f",
+        "\u8bc9\u8bbc",
+        "\u8fdc\u822a",
+        "\u4e89\u6267",
+        "\u7834\u571f",
+        "\u5b89\u846c",
+        "\u4f10\u6728",
+        "\u6398\u4e95",
+        "\u8fc1\u5f99",
+        "\u5f00\u4ed3",
+        "\u7f6e\u4ea7",
+        "\u5f00\u6e20"
+    ];
+
+    private static readonly string[] EnYiCandidates =
+    [
+        "Worship",
+        "Blessing",
+        "Travel",
+        "Meetings",
+        "Trade",
+        "Business",
+        "Study",
+        "Build",
+        "Gathering",
+        "Planning"
+    ];
+
+    private static readonly string[] EnJiCandidates =
+    [
+        "Dispute",
+        "Lawsuit",
+        "Major move",
+        "Groundwork",
+        "Burial",
+        "Long voyage",
+        "Contract rush",
+        "Risky purchase",
+        "Heavy repair",
+        "Conflict"
+    ];
+
     private TimeZoneService? _timeZoneService;
     private double _currentCellSize = 64;
-    private double _calendarDayFontSize = 14;
-    private double _calendarTodayDotSize = 28;
+    private double _weekdayFontSize = 17;
+    private FontWeight _weekdayFontWeight = FontWeight.SemiBold;
+    private double _calendarDayFontSize = 18;
+    private FontWeight _calendarDayFontWeight = FontWeight.SemiBold;
+    private double _calendarTodayDotSize = 32;
+    private int _lunarItemCount = 3;
+    private int _calendarVisibleRows = 6;
+    private bool? _isNightModeApplied;
+    private double _weekdayHeaderOpacity = 0.60;
+    private double _weekdayNumberOpacity = 0.90;
+    private double _weekendNumberOpacity = 0.58;
 
     public DateWidget()
     {
@@ -38,7 +109,7 @@ public partial class DateWidget : UserControl
 
     public void SetTimeZoneService(TimeZoneService timeZoneService)
     {
-        if (_timeZoneService != null)
+        if (_timeZoneService is not null)
         {
             _timeZoneService.TimeZoneChanged -= OnTimeZoneChanged;
         }
@@ -82,56 +153,67 @@ public partial class DateWidget : UserControl
         var lunar = LunarCalendarService.GetLunarInfo(now);
 
         GregorianHeadlineTextBlock.Text = isZh
-            ? $"{now.Month}月{now.Day}日 {ToChineseWeekday(now.DayOfWeek)}"
-            : now.ToString("MMM d ddd", culture);
+            ? $"{now.Month}\u6708{now.Day}\u65e5"
+            : now.ToString("MMM d", culture);
+
+        ApplyAdaptiveTypography();
 
         if (isZh)
         {
-            LunarDateTextBlock.Text = $"农历 {lunar.LunarDateZh}";
-            LunarMetaTextBlock.Text = $"{lunar.GanzhiYearZh}年（{lunar.ZodiacZh}年）";
-            YiLabelTextBlock.Text = "宜";
-            JiLabelTextBlock.Text = "忌";
-            YiItemsTextBlock.Text = "祭祀 祈福 出行 会友";
-            JiItemsTextBlock.Text = "动土 诉讼 远航 争执";
+            LunarDateTextBlock.Text = lunar.LunarDateZh;
+            LunarMetaTextBlock.Text = $"{lunar.GanzhiYearZh}\u5e74  {lunar.ZodiacZh}";
+            YiLabelTextBlock.Text = "\u5b9c";
+            JiLabelTextBlock.Text = "\u5fcc";
         }
         else
         {
             LunarDateTextBlock.Text = $"Lunar {lunar.LunarDateEn}";
-            LunarMetaTextBlock.Text = $"Ganzhi year: {lunar.GanzhiYearEn} ({lunar.ZodiacEn})";
+            LunarMetaTextBlock.Text = $"{lunar.GanzhiYearEn}  {lunar.ZodiacEn}";
             YiLabelTextBlock.Text = "Do";
             JiLabelTextBlock.Text = "Avoid";
-            YiItemsTextBlock.Text = "Worship Blessing Travel Meet";
-            JiItemsTextBlock.Text = "Groundwork Lawsuit Voyage Dispute";
         }
 
-        UpdateWeekdayHeaders(isZh);
-        GenerateCalendar(now);
-    }
+        var itemCount = isZh ? _lunarItemCount : Math.Max(1, _lunarItemCount - 1);
+        YiItemsTextBlock.Text = BuildDailySelection(
+            now.Date,
+            isZh ? ZhYiCandidates : EnYiCandidates,
+            count: itemCount,
+            salt: 17,
+            useChineseSpacing: isZh);
+        JiItemsTextBlock.Text = BuildDailySelection(
+            now.Date,
+            isZh ? ZhJiCandidates : EnJiCandidates,
+            count: itemCount,
+            salt: 29,
+            useChineseSpacing: isZh);
 
-    private static string ToChineseWeekday(DayOfWeek dayOfWeek)
-    {
-        return dayOfWeek switch
-        {
-            DayOfWeek.Sunday => "周日",
-            DayOfWeek.Monday => "周一",
-            DayOfWeek.Tuesday => "周二",
-            DayOfWeek.Wednesday => "周三",
-            DayOfWeek.Thursday => "周四",
-            DayOfWeek.Friday => "周五",
-            _ => "周六"
-        };
+        UpdateWeekdayHeaders(isZh);
+        ApplyModeVisualIfNeeded();
+        GenerateCalendar(now);
     }
 
     private void UpdateWeekdayHeaders(bool isZh)
     {
         var headers = isZh ? ZhWeekdayHeaders : EnWeekdayHeaders;
-        WeekdayText0.Text = headers[0];
-        WeekdayText1.Text = headers[1];
-        WeekdayText2.Text = headers[2];
-        WeekdayText3.Text = headers[3];
-        WeekdayText4.Text = headers[4];
-        WeekdayText5.Text = headers[5];
-        WeekdayText6.Text = headers[6];
+        var blocks = GetWeekdayHeaderBlocks();
+        for (var i = 0; i < blocks.Count; i++)
+        {
+            blocks[i].Text = headers[i];
+        }
+    }
+
+    private IReadOnlyList<TextBlock> GetWeekdayHeaderBlocks()
+    {
+        return
+        [
+            WeekdayText0,
+            WeekdayText1,
+            WeekdayText2,
+            WeekdayText3,
+            WeekdayText4,
+            WeekdayText5,
+            WeekdayText6
+        ];
     }
 
     private void GenerateCalendar(DateTime currentDate)
@@ -139,7 +221,8 @@ public partial class DateWidget : UserControl
         var removeList = new List<Control>();
         foreach (var child in CalendarGrid.Children)
         {
-            if (child is Control control && control.Tag is string tag &&
+            if (child is Control control &&
+                control.Tag is string tag &&
                 (tag == "day" || tag == "today-dot"))
             {
                 removeList.Add(control);
@@ -158,12 +241,19 @@ public partial class DateWidget : UserControl
         var firstDayOfMonth = new DateTime(year, month, 1);
         var daysInMonth = DateTime.DaysInMonth(year, month);
         var startDayOfWeek = (int)firstDayOfMonth.DayOfWeek;
+        _calendarVisibleRows = GetCalendarRowCount(startDayOfWeek, daysInMonth);
+        EnsureCalendarRows(_calendarVisibleRows);
+
+        // 4x2 widget has less vertical space than 2x2. Compress only on 6-row months.
+        var rowDensity = _calendarVisibleRows >= 6 ? 0.84 : 1.0;
+        var dayFontSize = Math.Clamp(_calendarDayFontSize * rowDensity, 8, 24);
+        var todayDotSize = Math.Clamp(_calendarTodayDotSize * rowDensity, 13.5, 32);
 
         for (var day = 1; day <= daysInMonth; day++)
         {
             var row = (day + startDayOfWeek - 1) / 7;
             var col = (day + startDayOfWeek - 1) % 7;
-            if (row > 4)
+            if (row >= _calendarVisibleRows)
             {
                 continue;
             }
@@ -173,8 +263,9 @@ public partial class DateWidget : UserControl
                 Text = day.ToString(CultureInfo.CurrentCulture),
                 HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
                 VerticalAlignment = Avalonia.Layout.VerticalAlignment.Center,
-                FontSize = _calendarDayFontSize,
-                FontWeight = FontWeight.SemiBold,
+                FontSize = dayFontSize,
+                FontWeight = _calendarDayFontWeight,
+                LineHeight = dayFontSize * 1.04,
                 Tag = "day"
             };
 
@@ -190,9 +281,9 @@ public partial class DateWidget : UserControl
                 dayText.Foreground = onAccentBrush;
                 var dot = new Border
                 {
-                    Width = _calendarTodayDotSize,
-                    Height = _calendarTodayDotSize,
-                    CornerRadius = new CornerRadius(_calendarTodayDotSize * 0.5),
+                    Width = todayDotSize,
+                    Height = todayDotSize,
+                    CornerRadius = new CornerRadius(todayDotSize * 0.5),
                     Background = accentBrush,
                     HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
                     VerticalAlignment = Avalonia.Layout.VerticalAlignment.Center,
@@ -208,8 +299,8 @@ public partial class DateWidget : UserControl
             {
                 var isWeekend = col is 0 or 6;
                 dayText.Foreground = isWeekend
-                    ? GetThemeBrush("AdaptiveTextSecondaryBrush", 0.82)
-                    : GetThemeBrush("AdaptiveTextPrimaryBrush", 0.92);
+                    ? GetThemeBrush("AdaptiveTextSecondaryBrush", _weekendNumberOpacity)
+                    : GetThemeBrush("AdaptiveTextPrimaryBrush", _weekdayNumberOpacity);
                 Grid.SetRow(dayText, row);
                 Grid.SetColumn(dayText, col);
                 CalendarGrid.Children.Add(dayText);
@@ -220,44 +311,155 @@ public partial class DateWidget : UserControl
     public void ApplyCellSize(double cellSize)
     {
         _currentCellSize = Math.Max(1, cellSize);
+        UpdateDate();
+    }
+
+    private void ApplyAdaptiveTypography()
+    {
         var scale = ResolveScale();
 
         RootBorder.CornerRadius = new CornerRadius(Math.Clamp(28 * scale, 16, 40));
-        RootBorder.Padding = new Thickness(Math.Clamp(12 * scale, 8, 18));
+        RootBorder.Padding = new Thickness(Math.Clamp(11 * scale, 7, 17));
+
+        LayoutRoot.ColumnSpacing = Math.Clamp(10 * scale, 6, 16);
+        LeftPanelGrid.RowSpacing = Math.Clamp(5.2 * scale, 2.5, 10);
+        WeekdayHeaderGrid.Margin = new Thickness(
+            0,
+            Math.Clamp(0.5 * scale, 0, 2),
+            0,
+            Math.Clamp(2.4 * scale, 1, 4));
+        CalendarGrid.Margin = new Thickness(0, 0, 0, Math.Clamp(0.8 * scale, 0, 2));
 
-        LeftPanelGrid.RowSpacing = Math.Clamp(8 * scale, 5, 14);
-        RightPanelGrid.RowSpacing = Math.Clamp(10 * scale, 6, 16);
         LunarCardBorder.CornerRadius = new CornerRadius(Math.Clamp(24 * scale, 14, 34));
-        LunarCardBorder.Padding = new Thickness(Math.Clamp(14 * scale, 9, 20));
+        LunarCardBorder.Padding = new Thickness(Math.Clamp(14 * scale, 8, 20));
+        RightPanelGrid.RowSpacing = Math.Clamp(7.5 * scale, 3.5, 11);
+        DividerBorder.Margin = new Thickness(0, Math.Clamp(1 * scale, 0, 2), 0, Math.Clamp(1 * scale, 0, 2));
 
-        GregorianHeadlineTextBlock.FontSize = Math.Clamp(22 * scale, 14, 34);
-        WeekdayText0.FontSize = Math.Clamp(13 * scale, 9, 18);
-        WeekdayText1.FontSize = WeekdayText0.FontSize;
-        WeekdayText2.FontSize = WeekdayText0.FontSize;
-        WeekdayText3.FontSize = WeekdayText0.FontSize;
-        WeekdayText4.FontSize = WeekdayText0.FontSize;
-        WeekdayText5.FontSize = WeekdayText0.FontSize;
-        WeekdayText6.FontSize = WeekdayText0.FontSize;
+        var isZh = CultureInfo.CurrentCulture.TwoLetterISOLanguageName.Equals("zh", StringComparison.OrdinalIgnoreCase);
+        var headerTextLength = Math.Max(1, GregorianHeadlineTextBlock.Text?.Length ?? (isZh ? 5 : 6));
+        var headerCompression = headerTextLength >= 8 ? 0.90 : headerTextLength >= 6 ? 0.95 : 1.0;
+        var densityBoost = scale <= 0.74 ? 0.90 : scale <= 0.90 ? 0.95 : scale >= 1.45 ? 1.05 : 1.0;
 
-        LunarDateTextBlock.FontSize = Math.Clamp(28 * scale, 17, 44);
-        LunarMetaTextBlock.FontSize = Math.Clamp(14 * scale, 10, 22);
-        YiLabelTextBlock.FontSize = Math.Clamp(18 * scale, 12, 28);
+        GregorianHeadlineTextBlock.FontSize = Math.Clamp(29 * scale * headerCompression * densityBoost, 12.5, 42);
+        GregorianHeadlineTextBlock.FontWeight = ToVariableWeight(Lerp(560, 720, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        GregorianHeadlineTextBlock.LineHeight = GregorianHeadlineTextBlock.FontSize * 1.03;
+
+        _weekdayFontSize = Math.Clamp(14.8 * scale * densityBoost, 7, 20);
+        _weekdayFontWeight = ToVariableWeight(Lerp(500, 640, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        foreach (var block in GetWeekdayHeaderBlocks())
+        {
+            block.FontSize = _weekdayFontSize;
+            block.FontWeight = _weekdayFontWeight;
+            block.LineHeight = _weekdayFontSize * 1.02;
+        }
+
+        _calendarDayFontSize = Math.Clamp(15.4 * scale * densityBoost, 8, 22);
+        _calendarDayFontWeight = ToVariableWeight(Lerp(540, 680, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        _calendarTodayDotSize = Math.Clamp(_calendarDayFontSize * 1.30, 13.5, 31);
+
+        var rightDensity = scale <= 0.72 ? 0.90 : scale <= 0.90 ? 0.95 : scale >= 1.38 ? 1.03 : 1.0;
+        LunarDateTextBlock.FontSize = Math.Clamp(30 * scale * rightDensity, 14, 44);
+        LunarMetaTextBlock.FontSize = Math.Clamp(12.5 * scale * rightDensity, 8.8, 18);
+        YiLabelTextBlock.FontSize = Math.Clamp(16.5 * scale * rightDensity, 10, 23);
         JiLabelTextBlock.FontSize = YiLabelTextBlock.FontSize;
-        YiItemsTextBlock.FontSize = Math.Clamp(16 * scale, 11, 24);
+        YiItemsTextBlock.FontSize = Math.Clamp(13.8 * scale * rightDensity, 8.5, 19);
         JiItemsTextBlock.FontSize = YiItemsTextBlock.FontSize;
+        YiItemsTextBlock.LineHeight = YiItemsTextBlock.FontSize * 1.15;
+        JiItemsTextBlock.LineHeight = JiItemsTextBlock.FontSize * 1.15;
 
-        _calendarDayFontSize = Math.Clamp(14 * scale, 9, 22);
-        _calendarTodayDotSize = Math.Clamp(28 * scale, 17, 38);
+        LunarDateTextBlock.FontWeight = ToVariableWeight(Lerp(640, 760, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        LunarMetaTextBlock.FontWeight = ToVariableWeight(Lerp(500, 620, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        YiLabelTextBlock.FontWeight = ToVariableWeight(Lerp(620, 740, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        JiLabelTextBlock.FontWeight = YiLabelTextBlock.FontWeight;
+        YiItemsTextBlock.FontWeight = ToVariableWeight(Lerp(520, 660, Math.Clamp((scale - 0.60) / 1.2, 0, 1)));
+        JiItemsTextBlock.FontWeight = YiItemsTextBlock.FontWeight;
 
-        UpdateDate();
+        var maxLines = scale <= 0.82 ? 1 : 2;
+        YiItemsTextBlock.MaxLines = maxLines;
+        JiItemsTextBlock.MaxLines = maxLines;
+
+        _lunarItemCount = scale switch
+        {
+            <= 0.72 => 2,
+            <= 0.96 => 3,
+            <= 1.32 => 4,
+            _ => 5
+        };
+
+        if (maxLines == 1)
+        {
+            _lunarItemCount = Math.Min(_lunarItemCount, 3);
+        }
+    }
+
+    private void ApplyModeVisualIfNeeded()
+    {
+        var isNightMode = ResolveIsNightMode();
+        if (_isNightModeApplied.HasValue && _isNightModeApplied.Value == isNightMode)
+        {
+            return;
+        }
+
+        _isNightModeApplied = isNightMode;
+        ApplyModeVisual(isNightMode);
+    }
+
+    private void ApplyModeVisual(bool isNightMode)
+    {
+        LunarCardBorder.BorderBrush = isNightMode
+            ? CreateBrush("#3FFFFFFF")
+            : CreateBrush("#14000000");
+        LunarCardBorder.BoxShadow = BoxShadows.Parse(isNightMode
+            ? "0 10 26 #42000000"
+            : "0 8 20 #1A000000");
+
+        _weekdayHeaderOpacity = isNightMode ? 0.66 : 0.60;
+        _weekdayNumberOpacity = isNightMode ? 0.93 : 0.90;
+        _weekendNumberOpacity = isNightMode ? 0.68 : 0.58;
+
+        GregorianHeadlineTextBlock.Foreground = GetThemeBrush("AdaptiveTextPrimaryBrush", isNightMode ? 0.97 : 0.95);
+        LunarDateTextBlock.Foreground = GetThemeBrush("AdaptiveTextPrimaryBrush", isNightMode ? 0.97 : 0.95);
+        LunarMetaTextBlock.Foreground = GetThemeBrush("AdaptiveTextSecondaryBrush", isNightMode ? 0.92 : 0.86);
+        YiItemsTextBlock.Foreground = GetThemeBrush("AdaptiveTextPrimaryBrush", isNightMode ? 0.95 : 0.92);
+        JiItemsTextBlock.Foreground = YiItemsTextBlock.Foreground;
+
+        foreach (var block in GetWeekdayHeaderBlocks())
+        {
+            block.Foreground = GetThemeBrush("AdaptiveTextSecondaryBrush", _weekdayHeaderOpacity);
+        }
+
+        YiLabelTextBlock.Foreground = CreateBrush(isNightMode ? "#8CB57D" : "#4E7D3A");
+        JiLabelTextBlock.Foreground = CreateBrush(isNightMode ? "#C98981" : "#A1473E");
+        DividerBorder.Opacity = isNightMode ? 0.48 : 0.72;
+    }
+
+    private bool ResolveIsNightMode()
+    {
+        if (ActualThemeVariant == ThemeVariant.Dark)
+        {
+            return true;
+        }
+
+        if (ActualThemeVariant == ThemeVariant.Light)
+        {
+            return false;
+        }
+
+        if (this.TryFindResource("AdaptiveSurfaceBaseBrush", out var value) &&
+            value is ISolidColorBrush solidBrush)
+        {
+            return CalculateRelativeLuminance(solidBrush.Color) < 0.45;
+        }
+
+        return false;
     }
 
     private double ResolveScale()
     {
-        var cellScale = Math.Clamp(_currentCellSize / 48d, 0.72, 1.55);
-        var heightScale = Bounds.Height > 1 ? Math.Clamp(Bounds.Height / 220d, 0.65, 1.65) : 1;
-        var widthScale = Bounds.Width > 1 ? Math.Clamp(Bounds.Width / 460d, 0.65, 1.65) : 1;
-        return Math.Clamp(Math.Min(cellScale, Math.Min(heightScale, widthScale) * 1.08), 0.65, 1.6);
+        var cellScale = Math.Clamp(_currentCellSize / 48d, 0.62, 1.8);
+        var heightScale = Bounds.Height > 1 ? Math.Clamp(Bounds.Height / 220d, 0.62, 1.85) : 1;
+        var widthScale = Bounds.Width > 1 ? Math.Clamp(Bounds.Width / 460d, 0.62, 1.85) : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(heightScale, widthScale) * 1.08), 0.62, 1.8);
     }
 
     private IBrush GetThemeBrush(string key, double opacity)
@@ -274,4 +476,88 @@ public partial class DateWidget : UserControl
 
         return new SolidColorBrush(Colors.Gray, opacity);
     }
+
+    private static IBrush CreateBrush(string colorHex)
+    {
+        return new SolidColorBrush(Color.Parse(colorHex));
+    }
+
+    private static string BuildDailySelection(
+        DateTime date,
+        string[] pool,
+        int count,
+        int salt,
+        bool useChineseSpacing)
+    {
+        if (pool.Length == 0 || count <= 0)
+        {
+            return string.Empty;
+        }
+
+        var target = Math.Min(count, pool.Length);
+        var selected = new List<string>(target);
+        var usedIndices = new HashSet<int>();
+        var cursor = Math.Abs(date.Year * 1009 + date.DayOfYear * 37 + salt * 211);
+        var step = (salt % Math.Max(1, pool.Length - 1)) + 1;
+
+        for (var i = 0; i < pool.Length * 3 && selected.Count < target; i++)
+        {
+            var index = (cursor + i * step) % pool.Length;
+            if (usedIndices.Add(index))
+            {
+                selected.Add(pool[index]);
+            }
+        }
+
+        if (selected.Count == 0)
+        {
+            return string.Empty;
+        }
+
+        return string.Join(useChineseSpacing ? " " : ", ", selected);
+    }
+
+    private static double Lerp(double from, double to, double t)
+    {
+        return from + ((to - from) * t);
+    }
+
+    private static FontWeight ToVariableWeight(double weight)
+    {
+        return (FontWeight)(int)Math.Clamp(Math.Round(weight), 1, 1000);
+    }
+
+    private static int GetCalendarRowCount(int startDayOfWeek, int daysInMonth)
+    {
+        return Math.Max(5, (int)Math.Ceiling((startDayOfWeek + daysInMonth) / 7d));
+    }
+
+    private void EnsureCalendarRows(int rowCount)
+    {
+        if (CalendarGrid.RowDefinitions.Count == rowCount)
+        {
+            return;
+        }
+
+        CalendarGrid.RowDefinitions.Clear();
+        for (var i = 0; i < rowCount; i++)
+        {
+            CalendarGrid.RowDefinitions.Add(new RowDefinition(GridLength.Star));
+        }
+    }
+
+    private static double CalculateRelativeLuminance(Color color)
+    {
+        static double ToLinear(double channel)
+        {
+            return channel <= 0.03928
+                ? channel / 12.92
+                : Math.Pow((channel + 0.055) / 1.055, 2.4);
+        }
+
+        var r = ToLinear(color.R / 255d);
+        var g = ToLinear(color.G / 255d);
+        var b = ToLinear(color.B / 255d);
+        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
+    }
 }