0.4.4

bilibili热搜组件

LanMountainDesktop/Views/Components/BilibiliHotSearchWidget.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             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:fi="using:FluentIcons.Avalonia"
+             mc:Ignorable="d"
+             d:DesignWidth="640"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.BilibiliHotSearchWidget">
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            Background="Transparent"
+            ClipToBounds="True"
+            BorderThickness="0"
+            Padding="0">
+        <Grid>
+            <Border x:Name="CardBorder"
+                    Background="#FCFCFD"
+                    CornerRadius="34"
+                    BorderBrush="Transparent"
+                    BorderThickness="0"
+                    Padding="16,14,16,14">
+                <Grid x:Name="ContentGrid"
+                      RowDefinitions="Auto,Auto,Auto,Auto,Auto"
+                      RowSpacing="6">
+                    <Grid x:Name="HeaderGrid"
+                          Grid.Row="0"
+                          ColumnDefinitions="Auto,*"
+                          ColumnSpacing="10">
+                        <Border x:Name="SearchBoxBorder"
+                                Height="38"
+                                CornerRadius="19"
+                                Background="#F1F2F4"
+                                BorderBrush="Transparent"
+                                BorderThickness="0"
+                                Padding="10,0"
+                                HorizontalAlignment="Left"
+                                PointerPressed="OnSearchBoxPointerPressed">
+                            <Grid ColumnDefinitions="Auto,Auto"
+                                  ColumnSpacing="6"
+                                  VerticalAlignment="Center">
+                                <fi:SymbolIcon x:Name="SearchGlyphIcon"
+                                               Symbol="Search"
+                                               IconVariant="Regular"
+                                               Foreground="#7A8088"
+                                               FontSize="17"
+                                               VerticalAlignment="Center" />
+                                <TextBlock x:Name="SearchEntryTextBlock"
+                                           Grid.Column="1"
+                                           Text="Search"
+                                           Foreground="#7A8088"
+                                           FontSize="18"
+                                           FontWeight="Medium"
+                                           VerticalAlignment="Center"
+                                           MaxLines="1"
+                                           TextTrimming="CharacterEllipsis" />
+                            </Grid>
+                        </Border>
+
+                        <TextBlock x:Name="TopRightTitleTextBlock"
+                                   Grid.Column="1"
+                                   Text="bilibili热搜"
+                                   Foreground="#F44C9F"
+                                   FontSize="24"
+                                   FontWeight="Bold"
+                                   HorizontalAlignment="Right"
+                                   VerticalAlignment="Center"
+                                   MaxLines="1"
+                                   TextTrimming="CharacterEllipsis" />
+                    </Grid>
+
+                    <Border x:Name="HotItem1Host"
+                            Grid.Row="1"
+                            Tag="0"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem1Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem1IndexTextBlock"
+                                       Text="1"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem1TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem2Host"
+                            Grid.Row="2"
+                            Tag="1"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem2Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem2IndexTextBlock"
+                                       Text="2"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem2TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem3Host"
+                            Grid.Row="3"
+                            Tag="2"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem3Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem3IndexTextBlock"
+                                       Text="3"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem3TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="HotItem4Host"
+                            Grid.Row="4"
+                            Tag="3"
+                            Background="Transparent"
+                            Padding="0,2"
+                            PointerPressed="OnHotItemPointerPressed">
+                        <Grid x:Name="HotItem4Grid"
+                              ColumnDefinitions="Auto,*"
+                              ColumnSpacing="8">
+                            <TextBlock x:Name="HotItem4IndexTextBlock"
+                                       Text="4"
+                                       Foreground="#F44C9F"
+                                       FontSize="18"
+                                       FontWeight="Bold"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Left" />
+                            <TextBlock x:Name="HotItem4TextBlock"
+                                       Grid.Column="1"
+                                       Text="Trending Topic"
+                                       Foreground="#202327"
+                                       FontSize="28"
+                                       FontWeight="SemiBold"
+                                       TextTrimming="CharacterEllipsis"
+                                       MaxLines="1"
+                                       VerticalAlignment="Center" />
+                        </Grid>
+                    </Border>
+                </Grid>
+            </Border>
+
+            <TextBlock x:Name="StatusTextBlock"
+                       IsVisible="False"
+                       Text="Loading"
+                       Foreground="#6A6F77"
+                       FontSize="16"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center" />
+        </Grid>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/BilibiliHotSearchWidget.axaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class BilibiliHotSearchWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
+{
+    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+
+    private const double BaseCellSize = 48d;
+    private const int BaseWidthCells = 4;
+    private const int BaseHeightCells = 2;
+    private const int MaxDisplayItemCount = 4;
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(15)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private readonly List<BilibiliHotSearchItemSnapshot> _activeItems = [];
+    private readonly List<HotItemVisual> _hotItemVisuals = [];
+
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private CancellationTokenSource? _refreshCts;
+    private string _languageCode = "zh-CN";
+    private string? _searchPageUrl;
+    private double _currentCellSize = BaseCellSize;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    private sealed record HotItemVisual(
+        Border Host,
+        Grid RowGrid,
+        TextBlock IndexTextBlock,
+        TextBlock TitleTextBlock);
+
+    public BilibiliHotSearchWidget()
+    {
+        InitializeComponent();
+
+        SearchEntryTextBlock.FontFamily = MiSansFontFamily;
+        TopRightTitleTextBlock.FontFamily = MiSansFontFamily;
+        HotItem1IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem2IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem3IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem4IndexTextBlock.FontFamily = MiSansFontFamily;
+        HotItem1TextBlock.FontFamily = MiSansFontFamily;
+        HotItem2TextBlock.FontFamily = MiSansFontFamily;
+        HotItem3TextBlock.FontFamily = MiSansFontFamily;
+        HotItem4TextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        _hotItemVisuals.Add(new HotItemVisual(HotItem1Host, HotItem1Grid, HotItem1IndexTextBlock, HotItem1TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem2Host, HotItem2Grid, HotItem2IndexTextBlock, HotItem2TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem3Host, HotItem3Grid, HotItem3IndexTextBlock, HotItem3TextBlock));
+        _hotItemVisuals.Add(new HotItemVisual(HotItem4Host, HotItem4Grid, HotItem4IndexTextBlock, HotItem4TextBlock));
+
+        _refreshTimer.Tick += OnRefreshTimerTick;
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        ApplyLoadingState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        UpdateAdaptiveLayout();
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshHotSearchAsync(forceRefresh: false);
+        }
+    }
+
+    public void RefreshFromSettings()
+    {
+        _recommendationService.ClearCache();
+        if (_isAttached)
+        {
+            _ = RefreshHotSearchAsync(forceRefresh: true);
+        }
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        _refreshTimer.Start();
+        _ = RefreshHotSearchAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshHotSearchAsync(forceRefresh: false);
+    }
+
+    private async Task RefreshHotSearchAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new BilibiliHotSearchQuery(
+                Locale: _languageCode,
+                ItemCount: MaxDisplayItemCount,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetBilibiliHotSearchAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            ApplySnapshot(result.Data);
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+        }
+    }
+
+    private void ApplySnapshot(BilibiliHotSearchSnapshot snapshot)
+    {
+        SearchEntryTextBlock.Text = ResolveSearchEntryText(snapshot.SearchPlaceholder);
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+
+        _searchPageUrl = NormalizeHttpUrl(snapshot.SearchUrl) ?? BuildDefaultSearchPageUrl();
+
+        _activeItems.Clear();
+        foreach (var item in snapshot.Items)
+        {
+            if (string.IsNullOrWhiteSpace(item.Title) || string.IsNullOrWhiteSpace(item.Url))
+            {
+                continue;
+            }
+
+            _activeItems.Add(item);
+            if (_activeItems.Count >= MaxDisplayItemCount)
+            {
+                break;
+            }
+        }
+
+        var fallbackText = L("bilihot.widget.fallback_item", "暂无热搜");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = i < _activeItems.Count
+                ? NormalizeCompactText(_activeItems[i].Title)
+                : fallbackText;
+        }
+
+        StatusTextBlock.IsVisible = false;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyLoadingState()
+    {
+        SearchEntryTextBlock.Text = L("bilihot.widget.search_entry", "搜索");
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+        _searchPageUrl = BuildDefaultSearchPageUrl();
+        _activeItems.Clear();
+
+        var loadingText = L("bilihot.widget.loading_item", "加载中...");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = loadingText;
+        }
+
+        StatusTextBlock.Text = L("bilihot.widget.loading", "加载中...");
+        StatusTextBlock.IsVisible = true;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private void ApplyFailedState()
+    {
+        SearchEntryTextBlock.Text = L("bilihot.widget.search_entry", "搜索");
+        TopRightTitleTextBlock.Text = L("bilihot.widget.top_right_label", "bilibili热搜");
+        _searchPageUrl = BuildDefaultSearchPageUrl();
+        _activeItems.Clear();
+
+        var fallbackText = L("bilihot.widget.fallback_item", "暂无热搜");
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            visual.Host.IsVisible = true;
+            visual.IndexTextBlock.Text = (i + 1).ToString();
+            visual.TitleTextBlock.Text = fallbackText;
+        }
+
+        StatusTextBlock.Text = L("bilihot.widget.fetch_failed", "热搜获取失败");
+        StatusTextBlock.IsVisible = true;
+        UpdateInteractionState();
+        UpdateAdaptiveLayout();
+    }
+
+    private string ResolveSearchEntryText(string? placeholder)
+    {
+        var compact = NormalizeCompactText(placeholder);
+        if (string.IsNullOrWhiteSpace(compact))
+        {
+            return L("bilihot.widget.search_entry", "搜索");
+        }
+
+        return compact;
+    }
+
+    private void OnSearchBoxPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        TryOpenUrl(_searchPageUrl);
+        e.Handled = true;
+    }
+
+    private void OnHotItemPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed ||
+            sender is not Border host ||
+            host.Tag is null ||
+            !int.TryParse(host.Tag.ToString(), out var index) ||
+            index < 0 ||
+            index >= _activeItems.Count)
+        {
+            return;
+        }
+
+        TryOpenUrl(_activeItems[index].Url);
+        e.Handled = true;
+    }
+
+    private void UpdateAdaptiveLayout()
+    {
+        var scale = ResolveScale();
+        var softScale = Math.Clamp(scale, 0.84, 1.26);
+        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
+        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
+
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * softScale, 16, 52));
+        RootBorder.Padding = new Thickness(0);
+
+        var horizontalPadding = Math.Clamp(16 * softScale, 8, 24);
+        var verticalPadding = Math.Clamp(14 * softScale, 7, 20);
+        CardBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * softScale, 16, 52));
+        CardBorder.Padding = new Thickness(horizontalPadding, verticalPadding, horizontalPadding, verticalPadding);
+
+        var innerWidth = Math.Max(120, totalWidth - (horizontalPadding * 2d));
+        var innerHeight = Math.Max(72, totalHeight - (verticalPadding * 2d));
+        var rowSpacing = Math.Clamp(6 * softScale, 2, 9);
+        ContentGrid.RowSpacing = rowSpacing;
+        HeaderGrid.ColumnSpacing = Math.Clamp(10 * softScale, 6, 16);
+
+        var availableRowsHeight = Math.Max(40, innerHeight - rowSpacing * 4d);
+        var minTopRowHeight = Math.Clamp(20 * softScale, 18, 34);
+        var topRowHeight = Math.Clamp(availableRowsHeight * 0.27, minTopRowHeight, 52);
+        var lineRowHeight = Math.Max(10, (availableRowsHeight - topRowHeight) / 4d);
+        var minLineRowHeight = Math.Clamp(13 * softScale, 11, 24);
+        if (lineRowHeight < minLineRowHeight)
+        {
+            lineRowHeight = minLineRowHeight;
+            topRowHeight = Math.Max(minTopRowHeight, availableRowsHeight - lineRowHeight * 4d);
+            lineRowHeight = Math.Max(10, (availableRowsHeight - topRowHeight) / 4d);
+        }
+
+        if (ContentGrid.RowDefinitions.Count >= 5)
+        {
+            ContentGrid.RowDefinitions[0].Height = new GridLength(topRowHeight);
+            for (var i = 1; i <= 4; i++)
+            {
+                ContentGrid.RowDefinitions[i].Height = new GridLength(lineRowHeight);
+            }
+        }
+
+        var searchBoxHeight = Math.Clamp(topRowHeight * 0.84, 20, 46);
+        SearchBoxBorder.Height = searchBoxHeight;
+        SearchBoxBorder.Width = Math.Clamp(innerWidth * 0.30, 80, 180);
+        SearchBoxBorder.CornerRadius = new CornerRadius(searchBoxHeight / 2d);
+        SearchBoxBorder.Padding = new Thickness(
+            Math.Clamp(searchBoxHeight * 0.24, 5, 10),
+            0,
+            Math.Clamp(searchBoxHeight * 0.24, 5, 10),
+            0);
+        SearchGlyphIcon.FontSize = Math.Clamp(searchBoxHeight * 0.45, 10, 20);
+        SearchEntryTextBlock.FontSize = Math.Clamp(searchBoxHeight * 0.44, 10, 18);
+
+        TopRightTitleTextBlock.MaxWidth = Math.Max(80, innerWidth - SearchBoxBorder.Width - HeaderGrid.ColumnSpacing);
+        TopRightTitleTextBlock.FontSize = Math.Clamp(topRowHeight * 0.46, 11, 22);
+
+        var lineColumnGap = Math.Clamp(lineRowHeight * 0.34, 5, 12);
+        var indexWidth = Math.Clamp(lineRowHeight * 1.02, 16, 28);
+        var indexFont = Math.Clamp(lineRowHeight * 0.50, 10, 16);
+        var itemFont = Math.Clamp(lineRowHeight * 0.62, 12, 24);
+        var rowPadding = Math.Clamp(lineRowHeight * 0.08, 1, 4);
+        var itemTextWidth = Math.Max(56, innerWidth - indexWidth - lineColumnGap);
+
+        foreach (var visual in _hotItemVisuals)
+        {
+            visual.RowGrid.ColumnSpacing = lineColumnGap;
+            if (visual.RowGrid.ColumnDefinitions.Count > 0)
+            {
+                visual.RowGrid.ColumnDefinitions[0].Width = new GridLength(indexWidth, GridUnitType.Pixel);
+            }
+
+            visual.Host.Padding = new Thickness(0, rowPadding, 0, rowPadding);
+            visual.IndexTextBlock.FontSize = indexFont;
+            visual.IndexTextBlock.MaxWidth = indexWidth;
+            visual.IndexTextBlock.HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Right;
+            visual.IndexTextBlock.TextAlignment = TextAlignment.Right;
+            visual.TitleTextBlock.FontSize = itemFont;
+            visual.TitleTextBlock.MaxWidth = itemTextWidth;
+            visual.TitleTextBlock.TextAlignment = TextAlignment.Left;
+        }
+
+        StatusTextBlock.FontSize = Math.Clamp(itemFont, 10, 20);
+    }
+
+    private void UpdateInteractionState()
+    {
+        for (var i = 0; i < _hotItemVisuals.Count; i++)
+        {
+            var visual = _hotItemVisuals[i];
+            var enabled = i < _activeItems.Count && !string.IsNullOrWhiteSpace(_activeItems[i].Url);
+            visual.Host.IsHitTestVisible = enabled;
+            visual.Host.Opacity = enabled ? 1.0 : 0.68;
+            visual.Host.Cursor = enabled
+                ? new Cursor(StandardCursorType.Hand)
+                : new Cursor(StandardCursorType.Arrow);
+        }
+
+        var searchEnabled = !string.IsNullOrWhiteSpace(_searchPageUrl);
+        SearchBoxBorder.IsHitTestVisible = searchEnabled;
+        SearchBoxBorder.Opacity = searchEnabled ? 1.0 : 0.72;
+        SearchBoxBorder.Cursor = searchEnabled
+            ? new Cursor(StandardCursorType.Hand)
+            : new Cursor(StandardCursorType.Arrow);
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private static string NormalizeCompactText(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return string.Empty;
+        }
+
+        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
+    }
+
+    private static string BuildDefaultSearchPageUrl()
+    {
+        return "https://search.bilibili.com/all";
+    }
+
+    private static string? NormalizeHttpUrl(string? rawUrl)
+    {
+        if (string.IsNullOrWhiteSpace(rawUrl))
+        {
+            return null;
+        }
+
+        var candidate = rawUrl.Trim();
+        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
+        {
+            return null;
+        }
+
+        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
+            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
+        {
+            return null;
+        }
+
+        return uri.ToString();
+    }
+
+    private void TryOpenUrl(string? rawUrl)
+    {
+        var normalizedUrl = NormalizeHttpUrl(rawUrl);
+        if (string.IsNullOrWhiteSpace(normalizedUrl))
+        {
+            return;
+        }
+
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = normalizedUrl,
+                UseShellExecute = true
+            };
+            Process.Start(startInfo);
+        }
+        catch
+        {
+            // Ignore malformed URLs or shell launch failures.
+        }
+    }
+
+    private double ResolveScale()
+    {
+        var expectedWidth = _currentCellSize * BaseWidthCells;
+        var expectedHeight = _currentCellSize * BaseHeightCells;
+        if (expectedWidth <= 0 || expectedHeight <= 0)
+        {
+            return 1d;
+        }
+
+        var actualWidth = Bounds.Width > 1 ? Bounds.Width : expectedWidth;
+        var actualHeight = Bounds.Height > 1 ? Bounds.Height : expectedHeight;
+        var scaleX = actualWidth / expectedWidth;
+        var scaleY = actualHeight / expectedHeight;
+        return Math.Clamp(Math.Min(scaleX, scaleY), 0.72, 2.8);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+}

LanMountainDesktop/Views/Components/DailySentenceSettingsWindow.axaml

@@ -1,87 +0,0 @@
-<UserControl xmlns="https://github.com/avaloniaui"
-             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"
-             mc:Ignorable="d"
-             d:DesignWidth="420"
-             d:DesignHeight="300"
-             x:Class="LanMountainDesktop.Views.Components.DailySentenceSettingsWindow">
-    <Border Background="{DynamicResource AdaptiveBackgroundBrush}"
-            Padding="16">
-        <Grid RowDefinitions="Auto,Auto,*"
-              RowSpacing="10">
-            <TextBlock x:Name="TitleTextBlock"
-                       Text="Daily sentence settings"
-                       FontSize="18"
-                       FontWeight="SemiBold"
-                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
-
-            <TextBlock x:Name="DescriptionTextBlock"
-                       Grid.Row="1"
-                       Text="Configure auto-rotation and refresh interval."
-                       FontSize="12"
-                       TextWrapping="Wrap"
-                       Foreground="{DynamicResource AdaptiveTextSecondaryBrush}" />
-
-            <ScrollViewer Grid.Row="2"
-                          HorizontalScrollBarVisibility="Disabled"
-                          VerticalScrollBarVisibility="Auto">
-                <StackPanel Spacing="10"
-                            Margin="0,0,6,0">
-                    <Border Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
-                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
-                            BorderThickness="1"
-                            CornerRadius="12"
-                            Padding="12">
-                        <StackPanel Spacing="6">
-                            <TextBlock x:Name="AutoRotateLabelTextBlock"
-                                       Text="Auto-rotation"
-                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
-                            <CheckBox x:Name="AutoRotateCheckBox"
-                                      Content="Enable auto-rotation"
-                                      Checked="OnAutoRotateChanged"
-                                      Unchecked="OnAutoRotateChanged" />
-                        </StackPanel>
-                    </Border>
-
-                    <Border x:Name="FrequencyCardBorder"
-                            Background="{DynamicResource AdaptiveSurfaceRaisedBrush}"
-                            BorderBrush="{DynamicResource AdaptiveButtonBorderBrush}"
-                            BorderThickness="1"
-                            CornerRadius="12"
-                            Padding="12"
-                            IsVisible="False">
-                        <StackPanel Spacing="6">
-                            <TextBlock x:Name="FrequencyLabelTextBlock"
-                                       Text="Rotation interval"
-                                       Foreground="{DynamicResource AdaptiveTextPrimaryBrush}" />
-                            <ComboBox x:Name="FrequencyComboBox"
-                                      HorizontalAlignment="Stretch"
-                                      MinWidth="0"
-                                      SelectionChanged="OnFrequencySelectionChanged">
-                                <ComboBoxItem x:Name="Frequency5mItem"
-                                              Tag="5"
-                                              Content="5 min" />
-                                <ComboBoxItem x:Name="Frequency10mItem"
-                                              Tag="10"
-                                              Content="10 min" />
-                                <ComboBoxItem x:Name="Frequency40mItem"
-                                              Tag="40"
-                                              Content="40 min" />
-                                <ComboBoxItem x:Name="Frequency1hItem"
-                                              Tag="60"
-                                              Content="1 hour" />
-                                <ComboBoxItem x:Name="Frequency12hItem"
-                                              Tag="720"
-                                              Content="12 hours" />
-                                <ComboBoxItem x:Name="Frequency24hItem"
-                                              Tag="1440"
-                                              Content="24 hours" />
-                            </ComboBox>
-                        </StackPanel>
-                    </Border>
-                </StackPanel>
-            </ScrollViewer>
-        </Grid>
-    </Border>
-</UserControl>

LanMountainDesktop/Views/Components/DailySentenceSettingsWindow.axaml.cs

@@ -1,137 +0,0 @@
-using System;
-using System.Linq;
-using Avalonia.Controls;
-using Avalonia.Controls.Primitives;
-using Avalonia.Interactivity;
-using LanMountainDesktop.Services;
-
-namespace LanMountainDesktop.Views.Components;
-
-public partial class DailySentenceSettingsWindow : UserControl
-{
-    private static readonly int[] SupportedIntervals = [5, 10, 40, 60, 720, 1440];
-
-    private readonly AppSettingsService _appSettingsService = new();
-    private readonly LocalizationService _localizationService = new();
-    private bool _suppressEvents;
-    private string _languageCode = "zh-CN";
-
-    public event EventHandler? SettingsChanged;
-
-    public DailySentenceSettingsWindow()
-    {
-        InitializeComponent();
-        LoadState();
-        ApplyLocalization();
-    }
-
-    private void LoadState()
-    {
-        var snapshot = _appSettingsService.Load();
-        _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
-
-        var enabled = snapshot.DailySentenceAutoRotateEnabled;
-        var interval = NormalizeInterval(snapshot.DailySentenceAutoRotateIntervalMinutes);
-
-        _suppressEvents = true;
-        AutoRotateCheckBox.IsChecked = enabled;
-        SelectInterval(interval);
-        FrequencyCardBorder.IsVisible = enabled;
-        _suppressEvents = false;
-    }
-
-    private void ApplyLocalization()
-    {
-        TitleTextBlock.Text = L("daily_sentence.settings.title", "Daily sentence settings");
-        DescriptionTextBlock.Text = L("daily_sentence.settings.desc", "Configure auto-rotation and refresh interval.");
-        AutoRotateLabelTextBlock.Text = L("daily_sentence.settings.auto_rotate_label", "Auto-rotation");
-        AutoRotateCheckBox.Content = L("daily_sentence.settings.auto_rotate_enabled", "Enable auto-rotation");
-        FrequencyLabelTextBlock.Text = L("daily_sentence.settings.frequency_label", "Rotation interval");
-        Frequency5mItem.Content = L("daily_sentence.settings.frequency_5m", "5 min");
-        Frequency10mItem.Content = L("daily_sentence.settings.frequency_10m", "10 min");
-        Frequency40mItem.Content = L("daily_sentence.settings.frequency_40m", "40 min");
-        Frequency1hItem.Content = L("daily_sentence.settings.frequency_1h", "1 hour");
-        Frequency12hItem.Content = L("daily_sentence.settings.frequency_12h", "12 hours");
-        Frequency24hItem.Content = L("daily_sentence.settings.frequency_24h", "24 hours");
-    }
-
-    private void OnAutoRotateChanged(object? sender, RoutedEventArgs e)
-    {
-        _ = sender;
-        _ = e;
-        if (_suppressEvents)
-        {
-            return;
-        }
-
-        var enabled = AutoRotateCheckBox.IsChecked == true;
-        FrequencyCardBorder.IsVisible = enabled;
-        SaveState();
-    }
-
-    private void OnFrequencySelectionChanged(object? sender, SelectionChangedEventArgs e)
-    {
-        _ = sender;
-        _ = e;
-        if (_suppressEvents)
-        {
-            return;
-        }
-
-        SaveState();
-    }
-
-    private void SaveState()
-    {
-        var snapshot = _appSettingsService.Load();
-        snapshot.DailySentenceAutoRotateEnabled = AutoRotateCheckBox.IsChecked == true;
-        snapshot.DailySentenceAutoRotateIntervalMinutes = GetSelectedInterval();
-        _appSettingsService.Save(snapshot);
-        SettingsChanged?.Invoke(this, EventArgs.Empty);
-    }
-
-    private int GetSelectedInterval()
-    {
-        if (FrequencyComboBox.SelectedItem is ComboBoxItem item &&
-            item.Tag is string tagText &&
-            int.TryParse(tagText, out var minutes))
-        {
-            return NormalizeInterval(minutes);
-        }
-
-        return 60;
-    }
-
-    private void SelectInterval(int intervalMinutes)
-    {
-        var selected = FrequencyComboBox.Items
-            .OfType<ComboBoxItem>()
-            .FirstOrDefault(item =>
-                item.Tag is string tagText &&
-                int.TryParse(tagText, out var minutes) &&
-                minutes == intervalMinutes);
-        FrequencyComboBox.SelectedItem = selected ?? FrequencyComboBox.Items.OfType<ComboBoxItem>().FirstOrDefault();
-    }
-
-    private static int NormalizeInterval(int minutes)
-    {
-        if (minutes <= 0)
-        {
-            return 60;
-        }
-
-        if (SupportedIntervals.Contains(minutes))
-        {
-            return minutes;
-        }
-
-        return SupportedIntervals
-            .OrderBy(value => Math.Abs(value - minutes))
-            .FirstOrDefault(60);
-    }
-
-    private string L(string key, string fallback)
-    {
-        return _localizationService.GetString(_languageCode, key, fallback);
-    }
-}

LanMountainDesktop/Views/Components/DailySentenceWidget.axaml

@@ -1,128 +0,0 @@
-<UserControl xmlns="https://github.com/avaloniaui"
-             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:fi="using:FluentIcons.Avalonia"
-             mc:Ignorable="d"
-             d:DesignWidth="640"
-             d:DesignHeight="320"
-             x:Class="LanMountainDesktop.Views.Components.DailySentenceWidget">
-
-    <Border x:Name="RootBorder"
-            CornerRadius="34"
-            ClipToBounds="True"
-            BorderThickness="0"
-            Background="#6F7B8D">
-        <Grid>
-            <Image x:Name="BackgroundImage"
-                   Stretch="UniformToFill" />
-
-            <Border x:Name="OverlayBorder">
-                <Border.Background>
-                    <LinearGradientBrush StartPoint="0,0"
-                                         EndPoint="0,1">
-                        <GradientStop Offset="0"
-                                      Color="#56000000" />
-                        <GradientStop Offset="0.52"
-                                      Color="#7A000000" />
-                        <GradientStop Offset="1"
-                                      Color="#8F000000" />
-                    </LinearGradientBrush>
-                </Border.Background>
-            </Border>
-
-            <Grid x:Name="ContentGrid"
-                  Margin="16,14,16,14"
-                  RowDefinitions="Auto,*,Auto"
-                  RowSpacing="8">
-                <Grid x:Name="HeaderGrid"
-                      Grid.Row="0"
-                      ColumnDefinitions="Auto,*,Auto"
-                      ColumnSpacing="8">
-                    <TextBlock x:Name="DayTextBlock"
-                               Text="3"
-                               Foreground="#F6F8FB"
-                               FontSize="72"
-                               FontWeight="Bold"
-                               FontFeatures="tnum"
-                               LineHeight="68"
-                               VerticalAlignment="Top"
-                               TextTrimming="CharacterEllipsis"
-                               MaxLines="1" />
-
-                    <TextBlock x:Name="MonthYearTextBlock"
-                               Grid.Column="1"
-                               Text="March 2026"
-                               Foreground="#ECF0F6"
-                               FontSize="44"
-                               FontWeight="Medium"
-                               VerticalAlignment="Center"
-                               Margin="4,0,0,0"
-                               TextTrimming="CharacterEllipsis"
-                               MaxLines="1" />
-
-                    <Button x:Name="RefreshButton"
-                            Grid.Column="2"
-                            Width="42"
-                            Height="42"
-                            HorizontalAlignment="Right"
-                            VerticalAlignment="Top"
-                            CornerRadius="21"
-                            Background="#12FFFFFF"
-                            BorderBrush="#3AFFFFFF"
-                            BorderThickness="1"
-                            Padding="0"
-                            Focusable="False">
-                        <fi:SymbolIcon x:Name="RefreshIcon"
-                                       Symbol="ArrowClockwise"
-                                       IconVariant="Regular"
-                                       FontSize="21"
-                                       Foreground="#F0F4FA" />
-                    </Button>
-                </Grid>
-
-                <StackPanel x:Name="SentenceStack"
-                            Grid.Row="1"
-                            VerticalAlignment="Center"
-                            Spacing="8">
-                    <TextBlock x:Name="SentenceTextBlock"
-                               Text="Heard melodies are sweet, but those unheard are sweeter."
-                               Foreground="#F7F9FC"
-                               FontSize="58"
-                               FontWeight="SemiBold"
-                               LineHeight="60"
-                               TextWrapping="Wrap"
-                               TextTrimming="CharacterEllipsis"
-                               MaxLines="3" />
-
-                    <TextBlock x:Name="TranslationTextBlock"
-                               Text="听见的旋律是美妙的，但听不见的会更美。"
-                               Foreground="#DDE3EC"
-                               FontSize="40"
-                               FontWeight="Medium"
-                               LineHeight="44"
-                               TextWrapping="Wrap"
-                               TextTrimming="CharacterEllipsis"
-                               MaxLines="2" />
-                </StackPanel>
-
-                <TextBlock x:Name="SourceTextBlock"
-                           Grid.Row="2"
-                           Text="Youdao Dictionary"
-                           Foreground="#C7CFDA"
-                           FontSize="30"
-                           FontWeight="Medium"
-                           TextTrimming="CharacterEllipsis"
-                           MaxLines="1" />
-            </Grid>
-
-            <TextBlock x:Name="StatusTextBlock"
-                       IsVisible="False"
-                       Text="Loading"
-                       Foreground="#E7EDF6"
-                       FontSize="16"
-                       HorizontalAlignment="Center"
-                       VerticalAlignment="Center" />
-        </Grid>
-    </Border>
-</UserControl>

LanMountainDesktop/Views/Components/DailySentenceWidget.axaml.cs

@@ -1,986 +0,0 @@
-using System;
-using System.Diagnostics;
-using System.Globalization;
-using System.IO;
-using System.Linq;
-using System.Net.Http;
-using System.Text.RegularExpressions;
-using System.Threading;
-using System.Threading.Tasks;
-using Avalonia;
-using Avalonia.Controls;
-using Avalonia.Input;
-using Avalonia.Interactivity;
-using Avalonia.Media;
-using Avalonia.Media.Imaging;
-using Avalonia.Threading;
-using LanMountainDesktop.Models;
-using LanMountainDesktop.Services;
-
-namespace LanMountainDesktop.Views.Components;
-
-public partial class DailySentenceWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget
-{
-    private static readonly Regex MultiWhitespaceRegex = new(@"\s+", RegexOptions.Compiled);
-    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
-    private static readonly FontWeight[] HeadlineWeightCandidates = [FontWeight.Bold, FontWeight.SemiBold, FontWeight.Medium];
-    private static readonly FontWeight[] BodyWeightCandidates = [FontWeight.Medium, FontWeight.Normal];
-    private static readonly FontWeight[] MetaWeightCandidates = [FontWeight.Medium, FontWeight.Normal, FontWeight.Light];
-    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
-    private static readonly HttpClient ImageHttpClient = new()
-    {
-        Timeout = TimeSpan.FromSeconds(8)
-    };
-
-    private const string BrowserUserAgent =
-        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0 Safari/537.36";
-
-    private const double BaseCellSize = 48d;
-    private const int BaseWidthCells = 4;
-    private const int BaseHeightCells = 2;
-    private static readonly int[] SupportedAutoRotateIntervalsMinutes = [5, 10, 40, 60, 720, 1440];
-
-    private readonly DispatcherTimer _refreshTimer = new()
-    {
-        Interval = TimeSpan.FromHours(6)
-    };
-
-    private readonly AppSettingsService _settingsService = new();
-    private readonly LocalizationService _localizationService = new();
-
-    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
-    private CancellationTokenSource? _refreshCts;
-    private Bitmap? _backgroundBitmap;
-    private string? _currentSourceUrl;
-    private string _languageCode = "zh-CN";
-    private double _currentCellSize = BaseCellSize;
-    private bool _isAttached;
-    private bool _isRefreshing;
-    private bool _autoRotateEnabled = true;
-
-    public DailySentenceWidget()
-    {
-        InitializeComponent();
-
-        DayTextBlock.FontFamily = MiSansFontFamily;
-        MonthYearTextBlock.FontFamily = MiSansFontFamily;
-        SentenceTextBlock.FontFamily = MiSansFontFamily;
-        TranslationTextBlock.FontFamily = MiSansFontFamily;
-        SourceTextBlock.FontFamily = MiSansFontFamily;
-        StatusTextBlock.FontFamily = MiSansFontFamily;
-
-        _refreshTimer.Tick += OnRefreshTimerTick;
-        RefreshButton.Click += OnRefreshButtonClick;
-        SourceTextBlock.PointerPressed += OnSourceTextBlockPointerPressed;
-        AttachedToVisualTree += OnAttachedToVisualTree;
-        DetachedFromVisualTree += OnDetachedFromVisualTree;
-        SizeChanged += OnSizeChanged;
-
-        ApplyCellSize(_currentCellSize);
-        UpdateLanguageCode();
-        ApplyAutoRotateSettings();
-        UpdateDateText();
-        ApplyLoadingState();
-        UpdateRefreshButtonState();
-    }
-
-    public void ApplyCellSize(double cellSize)
-    {
-        _currentCellSize = Math.Max(1, cellSize);
-        UpdateAdaptiveLayout();
-    }
-
-    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
-    {
-        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
-        if (_isAttached)
-        {
-            _ = RefreshSentenceAsync(forceRefresh: false);
-        }
-    }
-
-    public void RefreshFromSettings()
-    {
-        _recommendationService.ClearCache();
-        ApplyAutoRotateSettings();
-        if (_isAttached)
-        {
-            _ = RefreshSentenceAsync(forceRefresh: true);
-        }
-    }
-
-    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
-    {
-        _isAttached = true;
-        ApplyAutoRotateSettings();
-        UpdateRefreshButtonState();
-        _ = RefreshSentenceAsync(forceRefresh: false);
-    }
-
-    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
-    {
-        _isAttached = false;
-        _refreshTimer.Stop();
-        CancelRefreshRequest();
-        DisposeBackgroundBitmap();
-        UpdateRefreshButtonState();
-    }
-
-    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
-    {
-        ApplyCellSize(_currentCellSize);
-    }
-
-    private async void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
-    {
-        if (_isRefreshing)
-        {
-            return;
-        }
-
-        await RefreshSentenceAsync(forceRefresh: true);
-        e.Handled = true;
-    }
-
-    private async void OnRefreshTimerTick(object? sender, EventArgs e)
-    {
-        await RefreshSentenceAsync(forceRefresh: true);
-    }
-
-    private void OnSourceTextBlockPointerPressed(object? sender, Avalonia.Input.PointerPressedEventArgs e)
-    {
-        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
-        {
-            return;
-        }
-
-        TryOpenSourceUrl();
-        e.Handled = true;
-    }
-
-    private async Task RefreshSentenceAsync(bool forceRefresh)
-    {
-        if (!_isAttached || _isRefreshing)
-        {
-            return;
-        }
-
-        _isRefreshing = true;
-        UpdateRefreshButtonState();
-        UpdateLanguageCode();
-        UpdateDateText();
-
-        var cts = new CancellationTokenSource();
-        var previous = Interlocked.Exchange(ref _refreshCts, cts);
-        previous?.Cancel();
-        previous?.Dispose();
-
-        try
-        {
-            var sentenceQuery = new DailyWordQuery(
-                Locale: _languageCode,
-                ForceRefresh: forceRefresh);
-            var sentenceResult = await _recommendationService.GetDailyWordAsync(sentenceQuery, cts.Token);
-            if (!_isAttached || cts.IsCancellationRequested)
-            {
-                return;
-            }
-
-            if (!sentenceResult.Success || sentenceResult.Data is null)
-            {
-                ApplyFailedState();
-            }
-            else
-            {
-                ApplySentenceSnapshot(sentenceResult.Data);
-            }
-
-            var artworkQuery = new DailyArtworkQuery(
-                Locale: _languageCode,
-                ForceRefresh: forceRefresh);
-            var artworkResult = await _recommendationService.GetDailyArtworkAsync(artworkQuery, cts.Token);
-            if (!_isAttached || cts.IsCancellationRequested)
-            {
-                return;
-            }
-
-            if (artworkResult.Success && artworkResult.Data is not null)
-            {
-                await ApplyBackgroundSnapshotAsync(artworkResult.Data, cts.Token);
-            }
-            else if (_backgroundBitmap is null)
-            {
-                BackgroundImage.Source = null;
-            }
-        }
-        catch (OperationCanceledException)
-        {
-            // Ignore canceled requests.
-        }
-        catch
-        {
-            if (_isAttached && !cts.IsCancellationRequested)
-            {
-                ApplyFailedState();
-            }
-        }
-        finally
-        {
-            if (ReferenceEquals(_refreshCts, cts))
-            {
-                _refreshCts = null;
-            }
-
-            cts.Dispose();
-            _isRefreshing = false;
-            UpdateRefreshButtonState();
-        }
-    }
-
-    private void ApplySentenceSnapshot(DailyWordSnapshot snapshot)
-    {
-        var sentence = NormalizeCompactText(snapshot.ExampleSentence);
-        if (string.IsNullOrWhiteSpace(sentence))
-        {
-            sentence = NormalizeCompactText(snapshot.Meaning);
-        }
-
-        if (string.IsNullOrWhiteSpace(sentence))
-        {
-            sentence = L("dailysentence.widget.fallback_sentence", "No sentence available.");
-        }
-
-        var translation = NormalizeCompactText(snapshot.ExampleTranslation);
-        if (string.IsNullOrWhiteSpace(translation))
-        {
-            translation = NormalizeCompactText(snapshot.Meaning);
-        }
-
-        if (string.IsNullOrWhiteSpace(translation))
-        {
-            translation = L("dailysentence.widget.fallback_translation", "Tap refresh and try again.");
-        }
-
-        var sourceWord = NormalizeCompactText(snapshot.Word);
-        if (string.IsNullOrWhiteSpace(sourceWord))
-        {
-            sourceWord = L("dailysentence.widget.source_default", "Youdao Dictionary");
-        }
-
-        SentenceTextBlock.Text = sentence;
-        TranslationTextBlock.Text = translation;
-        SourceTextBlock.Text = string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase)
-            ? $"有道词典 · {sourceWord}"
-            : $"Youdao Dictionary · {sourceWord}";
-        _currentSourceUrl = NormalizeHttpUrl(snapshot.SourceUrl);
-
-        StatusTextBlock.IsVisible = false;
-        UpdateSourceInteractionState();
-        UpdateAdaptiveLayout();
-    }
-
-    private async Task ApplyBackgroundSnapshotAsync(DailyArtworkSnapshot snapshot, CancellationToken cancellationToken)
-    {
-        var bitmap = await TryLoadBackgroundBitmapAsync(snapshot.ImageUrl, snapshot.ThumbnailDataUrl, cancellationToken);
-        if (cancellationToken.IsCancellationRequested || !_isAttached)
-        {
-            bitmap?.Dispose();
-            return;
-        }
-
-        SetBackgroundBitmap(bitmap);
-    }
-
-    private static async Task<Bitmap?> TryLoadBackgroundBitmapAsync(
-        string? imageUrl,
-        string? thumbnailDataUrl,
-        CancellationToken cancellationToken)
-    {
-        var normalizedUrl = NormalizeHttpUrl(imageUrl);
-        if (!string.IsNullOrWhiteSpace(normalizedUrl))
-        {
-            var remote = await TryDownloadBitmapAsync(normalizedUrl, cancellationToken);
-            if (remote is not null)
-            {
-                return remote;
-            }
-        }
-
-        return TryDecodeBitmapFromDataUrl(thumbnailDataUrl);
-    }
-
-    private static async Task<Bitmap?> TryDownloadBitmapAsync(string imageUrl, CancellationToken cancellationToken)
-    {
-        try
-        {
-            using var request = new HttpRequestMessage(HttpMethod.Get, imageUrl);
-            request.Headers.TryAddWithoutValidation("User-Agent", BrowserUserAgent);
-            request.Headers.TryAddWithoutValidation("Accept", "image/avif,image/webp,image/apng,image/*,*/*;q=0.8");
-
-            using var response = await ImageHttpClient.SendAsync(
-                request,
-                HttpCompletionOption.ResponseHeadersRead,
-                cancellationToken);
-            if (!response.IsSuccessStatusCode)
-            {
-                return null;
-            }
-
-            await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
-            var memory = new MemoryStream();
-            await stream.CopyToAsync(memory, cancellationToken);
-            memory.Position = 0;
-            return new Bitmap(memory);
-        }
-        catch (OperationCanceledException)
-        {
-            throw;
-        }
-        catch
-        {
-            return null;
-        }
-    }
-
-    private static Bitmap? TryDecodeBitmapFromDataUrl(string? dataUrl)
-    {
-        if (string.IsNullOrWhiteSpace(dataUrl))
-        {
-            return null;
-        }
-
-        var trimmed = dataUrl.Trim();
-        var markerIndex = trimmed.IndexOf("base64,", StringComparison.OrdinalIgnoreCase);
-        if (markerIndex < 0 || markerIndex + 7 >= trimmed.Length)
-        {
-            return null;
-        }
-
-        var payload = trimmed[(markerIndex + 7)..];
-        try
-        {
-            var bytes = Convert.FromBase64String(payload);
-            return new Bitmap(new MemoryStream(bytes));
-        }
-        catch
-        {
-            return null;
-        }
-    }
-
-    private void ApplyLoadingState()
-    {
-        _currentSourceUrl = null;
-        SentenceTextBlock.Text = L("dailysentence.widget.loading_sentence", "Loading sentence...");
-        TranslationTextBlock.Text = L("dailysentence.widget.loading_translation", "Loading translation...");
-        SourceTextBlock.Text = L("dailysentence.widget.loading_source", "Youdao Dictionary");
-        StatusTextBlock.Text = L("dailysentence.widget.loading", "Loading...");
-        StatusTextBlock.IsVisible = true;
-        UpdateSourceInteractionState();
-        UpdateAdaptiveLayout();
-    }
-
-    private void ApplyFailedState()
-    {
-        _currentSourceUrl = null;
-        SentenceTextBlock.Text = L("dailysentence.widget.fallback_sentence", "No sentence available.");
-        TranslationTextBlock.Text = L("dailysentence.widget.fallback_translation", "Tap refresh and try again.");
-        SourceTextBlock.Text = L("dailysentence.widget.source_default", "Youdao Dictionary");
-        StatusTextBlock.Text = L("dailysentence.widget.fetch_failed", "Sentence fetch failed");
-        StatusTextBlock.IsVisible = true;
-        UpdateSourceInteractionState();
-        UpdateAdaptiveLayout();
-    }
-
-    private void UpdateAdaptiveLayout()
-    {
-        var scale = ResolveScale();
-        var totalWidth = Bounds.Width > 1 ? Bounds.Width : _currentCellSize * BaseWidthCells;
-        var totalHeight = Bounds.Height > 1 ? Bounds.Height : _currentCellSize * BaseHeightCells;
-
-        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 16, 52));
-        ContentGrid.Margin = new Thickness(
-            Math.Clamp(16 * scale, 8, 28),
-            Math.Clamp(14 * scale, 7, 24),
-            Math.Clamp(16 * scale, 8, 28),
-            Math.Clamp(14 * scale, 7, 24));
-        ContentGrid.RowSpacing = Math.Clamp(8 * scale, 4, 12);
-        HeaderGrid.ColumnSpacing = Math.Clamp(8 * scale, 4, 14);
-
-        var refreshSize = Math.Clamp(42 * scale, 24, 54);
-        RefreshButton.Width = refreshSize;
-        RefreshButton.Height = refreshSize;
-        RefreshButton.CornerRadius = new CornerRadius(refreshSize / 2d);
-        RefreshIcon.FontSize = Math.Clamp(21 * scale, 12, 28);
-
-        var innerWidth = Math.Max(100, totalWidth - ContentGrid.Margin.Left - ContentGrid.Margin.Right);
-        var innerHeight = Math.Max(56, totalHeight - ContentGrid.Margin.Top - ContentGrid.Margin.Bottom);
-        var rowSpacingTotal = ContentGrid.RowSpacing * 2d;
-        var availableRowsHeight = Math.Max(1, innerHeight - rowSpacingTotal);
-
-        var topRowHeight = Math.Clamp(innerHeight * 0.24, 18, 98);
-        var bottomRowHeight = Math.Clamp(innerHeight * 0.15, 11, 54);
-        var minTopRowHeight = Math.Max(Math.Clamp(14 * scale, 10, 28), refreshSize * 0.60);
-        var minBottomRowHeight = Math.Clamp(10 * scale, 7, 22);
-        var minMiddleRowHeight = Math.Clamp(22 * scale, 14, 46);
-
-        if (topRowHeight + bottomRowHeight + minMiddleRowHeight > availableRowsHeight)
-        {
-            var scaling = availableRowsHeight / Math.Max(1, topRowHeight + bottomRowHeight + minMiddleRowHeight);
-            topRowHeight = Math.Max(minTopRowHeight, topRowHeight * scaling);
-            bottomRowHeight = Math.Max(minBottomRowHeight, bottomRowHeight * scaling);
-        }
-
-        var middleHeight = Math.Max(
-            minMiddleRowHeight,
-            availableRowsHeight - topRowHeight - bottomRowHeight);
-
-        if (ContentGrid.RowDefinitions.Count >= 3)
-        {
-            ContentGrid.RowDefinitions[0].Height = new GridLength(topRowHeight, GridUnitType.Pixel);
-            ContentGrid.RowDefinitions[1].Height = new GridLength(middleHeight, GridUnitType.Pixel);
-            ContentGrid.RowDefinitions[2].Height = new GridLength(bottomRowHeight, GridUnitType.Pixel);
-        }
-
-        var topTextWidth = Math.Max(76, innerWidth - refreshSize - ContentGrid.RowSpacing);
-        var dayWidth = Math.Clamp(topTextWidth * 0.18, 20, Math.Max(24, topTextWidth * 0.32));
-        var monthYearWidth = Math.Max(48, topTextWidth - dayWidth - Math.Clamp(6 * scale, 2, 12));
-        DayTextBlock.MaxWidth = dayWidth;
-        MonthYearTextBlock.MaxWidth = monthYearWidth;
-
-        var dayLayout = FitAdaptiveTextLayout(
-            DayTextBlock.Text,
-            dayWidth,
-            topRowHeight,
-            minLines: 1,
-            maxLines: 1,
-            minFontSize: Math.Clamp(26 * scale, 12, 44),
-            maxFontSize: Math.Clamp(72 * scale, 20, 96),
-            weightCandidates: HeadlineWeightCandidates,
-            lineHeightFactor: 0.94);
-        DayTextBlock.FontSize = dayLayout.FontSize;
-        DayTextBlock.FontWeight = dayLayout.Weight;
-        DayTextBlock.LineHeight = dayLayout.LineHeight;
-
-        var monthLayout = FitAdaptiveTextLayout(
-            MonthYearTextBlock.Text,
-            monthYearWidth,
-            topRowHeight,
-            minLines: 1,
-            maxLines: 1,
-            minFontSize: Math.Clamp(18 * scale, 9, 32),
-            maxFontSize: Math.Clamp(44 * scale, 14, 62),
-            weightCandidates: BodyWeightCandidates,
-            lineHeightFactor: 1.00);
-        MonthYearTextBlock.FontSize = monthLayout.FontSize;
-        MonthYearTextBlock.FontWeight = monthLayout.Weight;
-        MonthYearTextBlock.LineHeight = monthLayout.LineHeight;
-
-        var sentenceTextDemand = Math.Clamp(NormalizeCompactText(SentenceTextBlock.Text).Length, 12, 360);
-        var translationTextDemand = Math.Clamp(NormalizeCompactText(TranslationTextBlock.Text).Length, 8, 260);
-
-        var sentenceMinLines = innerHeight >= _currentCellSize * 1.78 ? 2 : 1;
-        var sentenceMaxLines = innerHeight >= _currentCellSize * 2.7
-            ? 4
-            : innerHeight >= _currentCellSize * 1.92
-                ? 3
-                : 2;
-        var translationMaxLines = innerHeight >= _currentCellSize * 2.35 ? 3 : 2;
-
-        var sentenceMinFont = Math.Clamp(23 * scale, 10, 42);
-        var translationMinFont = Math.Clamp(16 * scale, 8.5, 30);
-        var sentenceMinHeight = sentenceMinFont * 1.06 * sentenceMinLines;
-        var translationMinHeight = translationMinFont * 1.06;
-        var bodyGap = Math.Clamp(8 * scale, 3, 12);
-        SentenceStack.Spacing = bodyGap;
-        var minBodyHeight = sentenceMinHeight + translationMinHeight + bodyGap;
-
-        double sentenceHeight;
-        double translationHeight;
-        if (middleHeight <= minBodyHeight + 0.6)
-        {
-            var compression = middleHeight / Math.Max(1, minBodyHeight);
-            sentenceHeight = Math.Max(10, sentenceMinHeight * compression);
-            translationHeight = Math.Max(8, translationMinHeight * compression);
-        }
-        else
-        {
-            var extraHeight = middleHeight - minBodyHeight;
-            var sentenceWeight = sentenceTextDemand + 16d;
-            var translationWeight = translationTextDemand + 8d;
-            var totalWeight = Math.Max(1d, sentenceWeight + translationWeight);
-            sentenceHeight = sentenceMinHeight + extraHeight * (sentenceWeight / totalWeight);
-            translationHeight = translationMinHeight + extraHeight * (translationWeight / totalWeight);
-        }
-
-        var sentenceLayout = FitAdaptiveTextLayout(
-            SentenceTextBlock.Text,
-            innerWidth,
-            sentenceHeight,
-            minLines: sentenceMinLines,
-            maxLines: sentenceMaxLines,
-            minFontSize: sentenceMinFont,
-            maxFontSize: Math.Clamp(58 * scale, 18, 80),
-            weightCandidates: HeadlineWeightCandidates,
-            lineHeightFactor: 1.06);
-        SentenceTextBlock.MaxWidth = innerWidth;
-        SentenceTextBlock.MaxLines = sentenceLayout.MaxLines;
-        SentenceTextBlock.FontSize = sentenceLayout.FontSize;
-        SentenceTextBlock.FontWeight = sentenceLayout.Weight;
-        SentenceTextBlock.LineHeight = sentenceLayout.LineHeight;
-
-        var translationLayout = FitAdaptiveTextLayout(
-            TranslationTextBlock.Text,
-            innerWidth,
-            translationHeight,
-            minLines: 1,
-            maxLines: translationMaxLines,
-            minFontSize: translationMinFont,
-            maxFontSize: Math.Clamp(40 * scale, 12, 54),
-            weightCandidates: BodyWeightCandidates,
-            lineHeightFactor: 1.06);
-        TranslationTextBlock.MaxWidth = innerWidth;
-        TranslationTextBlock.MaxLines = translationLayout.MaxLines;
-        TranslationTextBlock.FontSize = translationLayout.FontSize;
-        TranslationTextBlock.FontWeight = translationLayout.Weight;
-        TranslationTextBlock.LineHeight = translationLayout.LineHeight;
-        SentenceTextBlock.MinHeight = Math.Max(0, sentenceLayout.LineHeight * Math.Min(sentenceLayout.MaxLines, Math.Max(1, sentenceMinLines)));
-        TranslationTextBlock.MinHeight = Math.Max(0, translationLayout.LineHeight);
-
-        var sourceLayout = FitAdaptiveTextLayout(
-            SourceTextBlock.Text,
-            innerWidth,
-            bottomRowHeight,
-            minLines: 1,
-            maxLines: 1,
-            minFontSize: Math.Clamp(14 * scale, 8, 26),
-            maxFontSize: Math.Clamp(30 * scale, 10, 40),
-            weightCandidates: MetaWeightCandidates,
-            lineHeightFactor: 1.02);
-        SourceTextBlock.MaxWidth = innerWidth;
-        SourceTextBlock.FontSize = sourceLayout.FontSize;
-        SourceTextBlock.FontWeight = sourceLayout.Weight;
-        SourceTextBlock.LineHeight = sourceLayout.LineHeight;
-
-        StatusTextBlock.FontSize = Math.Clamp(16 * scale, 9, 24);
-    }
-
-    private void UpdateRefreshButtonState()
-    {
-        RefreshButton.IsEnabled = !_isRefreshing;
-        RefreshButton.Opacity = _isAttached ? 1.0 : 0.85;
-        RefreshIcon.Opacity = _isRefreshing ? 0.56 : 1.0;
-    }
-
-    private void UpdateSourceInteractionState()
-    {
-        var enabled = !string.IsNullOrWhiteSpace(_currentSourceUrl);
-        SourceTextBlock.IsHitTestVisible = enabled;
-        SourceTextBlock.Cursor = enabled
-            ? new Cursor(StandardCursorType.Hand)
-            : new Cursor(StandardCursorType.Arrow);
-        SourceTextBlock.Opacity = enabled ? 1.0 : 0.86;
-    }
-
-    private void UpdateLanguageCode()
-    {
-        try
-        {
-            var snapshot = _settingsService.Load();
-            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
-        }
-        catch
-        {
-            _languageCode = "zh-CN";
-        }
-    }
-
-    private void ApplyAutoRotateSettings()
-    {
-        var enabled = true;
-        var intervalMinutes = 60;
-
-        try
-        {
-            var snapshot = _settingsService.Load();
-            enabled = snapshot.DailySentenceAutoRotateEnabled;
-            intervalMinutes = NormalizeAutoRotateIntervalMinutes(snapshot.DailySentenceAutoRotateIntervalMinutes);
-        }
-        catch
-        {
-            // Keep fallback defaults.
-        }
-
-        _autoRotateEnabled = enabled;
-        _refreshTimer.Interval = TimeSpan.FromMinutes(intervalMinutes);
-
-        if (!_isAttached)
-        {
-            return;
-        }
-
-        if (_autoRotateEnabled)
-        {
-            if (!_refreshTimer.IsEnabled)
-            {
-                _refreshTimer.Start();
-            }
-        }
-        else if (_refreshTimer.IsEnabled)
-        {
-            _refreshTimer.Stop();
-        }
-    }
-
-    private static int NormalizeAutoRotateIntervalMinutes(int minutes)
-    {
-        if (minutes <= 0)
-        {
-            return 60;
-        }
-
-        if (SupportedAutoRotateIntervalsMinutes.Contains(minutes))
-        {
-            return minutes;
-        }
-
-        return SupportedAutoRotateIntervalsMinutes
-            .OrderBy(value => Math.Abs(value - minutes))
-            .FirstOrDefault(60);
-    }
-
-    private void UpdateDateText()
-    {
-        var now = DateTime.Now;
-        var culture = ResolveCulture();
-        DayTextBlock.Text = now.Day.ToString(CultureInfo.InvariantCulture);
-        MonthYearTextBlock.Text = now.ToString("MMMM yyyy", culture);
-    }
-
-    private void SetBackgroundBitmap(Bitmap? bitmap)
-    {
-        if (ReferenceEquals(BackgroundImage.Source, _backgroundBitmap))
-        {
-            BackgroundImage.Source = null;
-        }
-
-        _backgroundBitmap?.Dispose();
-        _backgroundBitmap = bitmap;
-        BackgroundImage.Source = bitmap;
-    }
-
-    private void DisposeBackgroundBitmap()
-    {
-        SetBackgroundBitmap(null);
-    }
-
-    private void TryOpenSourceUrl()
-    {
-        var normalized = NormalizeHttpUrl(_currentSourceUrl);
-        if (string.IsNullOrWhiteSpace(normalized))
-        {
-            return;
-        }
-
-        try
-        {
-            var startInfo = new ProcessStartInfo
-            {
-                FileName = normalized,
-                UseShellExecute = true
-            };
-            Process.Start(startInfo);
-        }
-        catch
-        {
-            // Ignore malformed URLs or shell launch failures.
-        }
-    }
-
-    private void CancelRefreshRequest()
-    {
-        var cts = Interlocked.Exchange(ref _refreshCts, null);
-        if (cts is null)
-        {
-            return;
-        }
-
-        cts.Cancel();
-        cts.Dispose();
-    }
-
-    private string L(string key, string fallback)
-    {
-        return _localizationService.GetString(_languageCode, key, fallback);
-    }
-
-    private CultureInfo ResolveCulture()
-    {
-        try
-        {
-            return CultureInfo.GetCultureInfo(_languageCode);
-        }
-        catch
-        {
-            return CultureInfo.InvariantCulture;
-        }
-    }
-
-    private double ResolveScale()
-    {
-        var cellScale = Math.Clamp(_currentCellSize / BaseCellSize, 0.56, 2.0);
-        var widthScale = Bounds.Width > 1
-            ? Math.Clamp(Bounds.Width / Math.Max(1, _currentCellSize * BaseWidthCells), 0.56, 2.0)
-            : 1;
-        var heightScale = Bounds.Height > 1
-            ? Math.Clamp(Bounds.Height / Math.Max(1, _currentCellSize * BaseHeightCells), 0.56, 2.0)
-            : 1;
-        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.56, 2.0);
-    }
-
-    private static string NormalizeCompactText(string? text)
-    {
-        if (string.IsNullOrWhiteSpace(text))
-        {
-            return string.Empty;
-        }
-
-        return MultiWhitespaceRegex.Replace(text.Trim(), " ");
-    }
-
-    private static string? NormalizeHttpUrl(string? rawUrl)
-    {
-        if (string.IsNullOrWhiteSpace(rawUrl))
-        {
-            return null;
-        }
-
-        var candidate = rawUrl.Trim();
-        if (!Uri.TryCreate(candidate, UriKind.Absolute, out var uri))
-        {
-            return null;
-        }
-
-        if (!string.Equals(uri.Scheme, Uri.UriSchemeHttp, StringComparison.OrdinalIgnoreCase) &&
-            !string.Equals(uri.Scheme, Uri.UriSchemeHttps, StringComparison.OrdinalIgnoreCase))
-        {
-            return null;
-        }
-
-        return uri.ToString();
-    }
-
-    private static AdaptiveTextLayout FitAdaptiveTextLayout(
-        string? text,
-        double maxWidth,
-        double maxHeight,
-        int minLines,
-        int maxLines,
-        double minFontSize,
-        double maxFontSize,
-        FontWeight[] weightCandidates,
-        double lineHeightFactor)
-    {
-        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
-        var safeMinLines = Math.Max(1, minLines);
-        var safeMaxLines = Math.Max(safeMinLines, maxLines);
-        var linesByHeight = ResolveMaxLinesByHeight(maxHeight, minFontSize, lineHeightFactor, safeMinLines, safeMaxLines);
-
-        var candidates = weightCandidates is { Length: > 0 }
-            ? weightCandidates
-            : [FontWeight.Normal];
-
-        AdaptiveTextLayout? best = null;
-        foreach (var weight in candidates)
-        {
-            for (var lineLimit = linesByHeight; lineLimit >= safeMinLines; lineLimit--)
-            {
-                var fontSize = FitFontSize(
-                    content,
-                    maxWidth,
-                    maxHeight,
-                    lineLimit,
-                    minFontSize,
-                    maxFontSize,
-                    weight,
-                    lineHeightFactor);
-                var lineHeight = fontSize * lineHeightFactor;
-                var measuredSize = MeasureTextSize(content, fontSize, weight, Math.Max(1, maxWidth), lineHeight);
-                var measuredLineCount = Math.Max(1, (int)Math.Ceiling(measuredSize.Height / Math.Max(1, lineHeight)));
-                var overflowLines = Math.Max(0, measuredLineCount - lineLimit);
-                var overflowHeight = Math.Max(0, measuredSize.Height - maxHeight);
-                var overflowScore = overflowLines * 1000d + overflowHeight;
-                var fitsCompletely = overflowLines == 0 && overflowHeight <= 0.6;
-                var candidate = new AdaptiveTextLayout(fontSize, weight, lineLimit, lineHeight, overflowScore, fitsCompletely);
-
-                if (best is null || IsBetterAdaptiveTextCandidate(candidate, best.Value))
-                {
-                    best = candidate;
-                }
-            }
-        }
-
-        if (best is not null)
-        {
-            return best.Value;
-        }
-
-        var fallbackFontSize = Math.Max(6, minFontSize);
-        return new AdaptiveTextLayout(
-            fallbackFontSize,
-            FontWeight.Normal,
-            safeMinLines,
-            fallbackFontSize * lineHeightFactor,
-            double.MaxValue,
-            fitsCompletely: false);
-    }
-
-    private static bool IsBetterAdaptiveTextCandidate(AdaptiveTextLayout candidate, AdaptiveTextLayout best)
-    {
-        if (candidate.FitsCompletely && !best.FitsCompletely)
-        {
-            return true;
-        }
-
-        if (!candidate.FitsCompletely && best.FitsCompletely)
-        {
-            return false;
-        }
-
-        if (candidate.FitsCompletely && best.FitsCompletely)
-        {
-            if (candidate.FontSize > best.FontSize + 0.12)
-            {
-                return true;
-            }
-
-            if (Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 && candidate.MaxLines < best.MaxLines)
-            {
-                return true;
-            }
-
-            return false;
-        }
-
-        if (candidate.OverflowScore < best.OverflowScore - 0.2)
-        {
-            return true;
-        }
-
-        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
-            candidate.FontSize > best.FontSize + 0.12)
-        {
-            return true;
-        }
-
-        if (Math.Abs(candidate.OverflowScore - best.OverflowScore) <= 0.2 &&
-            Math.Abs(candidate.FontSize - best.FontSize) <= 0.12 &&
-            candidate.MaxLines > best.MaxLines)
-        {
-            return true;
-        }
-
-        return false;
-    }
-
-    private static int ResolveMaxLinesByHeight(
-        double maxHeight,
-        double minFontSize,
-        double lineHeightFactor,
-        int minLines,
-        int maxLines)
-    {
-        var safeMinLines = Math.Max(1, minLines);
-        var safeMaxLines = Math.Max(safeMinLines, maxLines);
-        var lineHeight = Math.Max(1, Math.Max(6, minFontSize) * lineHeightFactor);
-        var maxHeightWithTolerance = Math.Max(1, maxHeight + 0.6);
-        var linesByHeight = (int)Math.Floor(maxHeightWithTolerance / lineHeight);
-        return Math.Clamp(linesByHeight, safeMinLines, safeMaxLines);
-    }
-
-    private static double FitFontSize(
-        string? text,
-        double maxWidth,
-        double maxHeight,
-        int maxLines,
-        double minFontSize,
-        double maxFontSize,
-        FontWeight weight,
-        double lineHeightFactor)
-    {
-        var content = string.IsNullOrWhiteSpace(text) ? " " : text.Trim();
-        var min = Math.Max(6, minFontSize);
-        var max = Math.Max(min, maxFontSize);
-        var low = min;
-        var high = max;
-        var best = min;
-
-        for (var i = 0; i < 18; i++)
-        {
-            var candidate = (low + high) / 2d;
-            var lineHeight = candidate * lineHeightFactor;
-            var size = MeasureTextSize(content, candidate, weight, Math.Max(1, maxWidth), lineHeight);
-            var lineCount = Math.Max(1, (int)Math.Ceiling(size.Height / Math.Max(1, lineHeight)));
-            var fits = size.Height <= maxHeight + 0.6 && lineCount <= Math.Max(1, maxLines);
-
-            if (fits)
-            {
-                best = candidate;
-                low = candidate;
-            }
-            else
-            {
-                high = candidate;
-            }
-        }
-
-        return best;
-    }
-
-    private static Size MeasureTextSize(string text, double fontSize, FontWeight weight, double maxWidth, double lineHeight)
-    {
-        var probe = new TextBlock
-        {
-            Text = text,
-            FontFamily = MiSansFontFamily,
-            FontSize = fontSize,
-            FontWeight = weight,
-            TextWrapping = TextWrapping.Wrap,
-            LineHeight = lineHeight
-        };
-
-        probe.Measure(new Size(Math.Max(1, maxWidth), double.PositiveInfinity));
-        return probe.DesiredSize;
-    }
-
-    private readonly struct AdaptiveTextLayout
-    {
-        public AdaptiveTextLayout(
-            double fontSize,
-            FontWeight weight,
-            int maxLines,
-            double lineHeight,
-            double overflowScore,
-            bool fitsCompletely)
-        {
-            FontSize = fontSize;
-            Weight = weight;
-            MaxLines = Math.Max(1, maxLines);
-            LineHeight = lineHeight;
-            OverflowScore = overflowScore;
-            FitsCompletely = fitsCompletely;
-        }
-
-        public double FontSize { get; }
-
-        public FontWeight Weight { get; }
-
-        public int MaxLines { get; }
-
-        public double LineHeight { get; }
-
-        public double OverflowScore { get; }
-
-        public bool FitsCompletely { get; }
-    }
-}

LanMountainDesktop/Views/Components/DesktopComponentRuntimeRegistry.cs

@@ -41,7 +41,8 @@ public sealed class DesktopComponentRuntimeDescriptor
         double cellSize,
         TimeZoneService timeZoneService,
         IWeatherInfoService weatherInfoService,
-        IRecommendationInfoService recommendationInfoService)
+        IRecommendationInfoService recommendationInfoService,
+        ICalculatorDataService calculatorDataService)
     {
         var control = _controlFactory();
         if (control is IDesktopComponentWidget sizedComponent)
@@ -64,6 +65,11 @@ public sealed class DesktopComponentRuntimeDescriptor
             recommendationInfoAwareComponent.SetRecommendationInfoService(recommendationInfoService);
         }
 
+        if (control is ICalculatorInfoAwareComponentWidget calculatorInfoAwareComponent)
+        {
+            calculatorInfoAwareComponent.SetCalculatorDataService(calculatorDataService);
+        }
+
         return control;
     }
 
@@ -234,16 +240,21 @@ public sealed class DesktopComponentRuntimeRegistry
                     "component.daily_word",
                     () => new DailyWordWidget(),
                     cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
-                new DesktopComponentRuntimeRegistration(
-                    BuiltInComponentIds.DesktopDailySentence,
-                    "component.daily_sentence",
-                    () => new DailySentenceWidget(),
-                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
                 new DesktopComponentRuntimeRegistration(
                     BuiltInComponentIds.DesktopCnrDailyNews,
                     "component.cnr_daily_news",
                     () => new CnrDailyNewsWidget(),
                     cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopBilibiliHotSearch,
+                    "component.bilibili_hot_search",
+                    () => new BilibiliHotSearchWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.34, 14, 30)),
+                new DesktopComponentRuntimeRegistration(
+                    BuiltInComponentIds.DesktopExchangeRateCalculator,
+                    "component.exchange_rate_converter",
+                    () => new ExchangeRateCalculatorWidget(),
+                    cellSize => Math.Clamp(cellSize * 0.28, 12, 26)),
                 new DesktopComponentRuntimeRegistration(
                     BuiltInComponentIds.DesktopWhiteboard,
                     "component.whiteboard",

LanMountainDesktop/Views/Components/ExchangeRateCalculatorWidget.axaml

@@ -0,0 +1,194 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             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"
+             mc:Ignorable="d"
+             d:DesignWidth="320"
+             d:DesignHeight="320"
+             x:Class="LanMountainDesktop.Views.Components.ExchangeRateCalculatorWidget">
+
+    <UserControl.Styles>
+        <Style Selector="Button">
+            <Setter Property="CornerRadius" Value="16" />
+            <Setter Property="Background" Value="#F8F9FB" />
+            <Setter Property="BorderBrush" Value="#00000000" />
+            <Setter Property="BorderThickness" Value="0" />
+            <Setter Property="FontSize" Value="26" />
+            <Setter Property="FontWeight" Value="SemiBold" />
+            <Setter Property="Foreground" Value="#111723" />
+            <Setter Property="Padding" Value="0" />
+        </Style>
+    </UserControl.Styles>
+
+    <Border x:Name="RootBorder"
+            CornerRadius="34"
+            ClipToBounds="True"
+            Padding="12"
+            Background="#ECEDEF">
+        <Viewbox Stretch="Uniform">
+            <Grid x:Name="LayoutRoot"
+                  Width="304"
+                  Height="304"
+                  RowDefinitions="Auto,Auto,*"
+                  RowSpacing="8">
+                <Grid Grid.Row="0"
+                      ColumnDefinitions="*,62"
+                      RowDefinitions="Auto,Auto"
+                      RowSpacing="8"
+                      ColumnSpacing="8">
+                    <Border x:Name="FromCurrencyRowBorder"
+                            Grid.Row="0"
+                            Grid.Column="0"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            Padding="12,8"
+                            PointerPressed="OnFromCurrencyRowPointerPressed">
+                        <Grid ColumnDefinitions="Auto,Auto,*"
+                              ColumnSpacing="8">
+                            <StackPanel Orientation="Vertical"
+                                        Spacing="1"
+                                        VerticalAlignment="Center">
+                                <TextBlock x:Name="FromCurrencyCodeTextBlock"
+                                           Text="USD"
+                                           FontSize="18"
+                                           FontWeight="SemiBold"
+                                           Foreground="#121722" />
+                                <TextBlock x:Name="FromCurrencyNameTextBlock"
+                                           Text="美元"
+                                           FontSize="13"
+                                           Foreground="#6C7382" />
+                            </StackPanel>
+                            <TextBlock Grid.Column="1"
+                                       Text=">"
+                                       FontSize="18"
+                                       Foreground="#A3A9B6"
+                                       VerticalAlignment="Center" />
+                            <TextBlock x:Name="InputAmountTextBlock"
+                                       Grid.Column="2"
+                                       Text="100"
+                                       FontSize="42"
+                                       FontWeight="Bold"
+                                       Foreground="#F08D20"
+                                       TextAlignment="Right"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Right"
+                                       MaxLines="1"
+                                       TextTrimming="CharacterEllipsis" />
+                        </Grid>
+                    </Border>
+
+                    <Border x:Name="ToCurrencyRowBorder"
+                            Grid.Row="1"
+                            Grid.Column="0"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            Padding="12,8"
+                            PointerPressed="OnToCurrencyRowPointerPressed">
+                        <Grid ColumnDefinitions="Auto,Auto,*"
+                              ColumnSpacing="8">
+                            <StackPanel Orientation="Vertical"
+                                        Spacing="1"
+                                        VerticalAlignment="Center">
+                                <TextBlock x:Name="ToCurrencyCodeTextBlock"
+                                           Text="CNY"
+                                           FontSize="18"
+                                           FontWeight="SemiBold"
+                                           Foreground="#121722" />
+                                <TextBlock x:Name="ToCurrencyNameTextBlock"
+                                           Text="人民币"
+                                           FontSize="13"
+                                           Foreground="#6C7382" />
+                            </StackPanel>
+                            <TextBlock Grid.Column="1"
+                                       Text=">"
+                                       FontSize="18"
+                                       Foreground="#A3A9B6"
+                                       VerticalAlignment="Center" />
+                            <TextBlock x:Name="ConvertedAmountTextBlock"
+                                       Grid.Column="2"
+                                       Text="0"
+                                       FontSize="42"
+                                       FontWeight="Bold"
+                                       Foreground="#0F1622"
+                                       TextAlignment="Right"
+                                       VerticalAlignment="Center"
+                                       HorizontalAlignment="Right"
+                                       MaxLines="1"
+                                       TextTrimming="CharacterEllipsis" />
+                        </Grid>
+                    </Border>
+
+                    <Button x:Name="SwapCurrencyButton"
+                            Grid.Row="0"
+                            Grid.RowSpan="2"
+                            Grid.Column="1"
+                            CornerRadius="16"
+                            Background="#F8F9FB"
+                            BorderBrush="#00000000"
+                            BorderThickness="0"
+                            FontSize="30"
+                            Content="⇅"
+                            Click="OnSwapCurrencyButtonClick" />
+                </Grid>
+
+                <TextBlock x:Name="RateTextBlock"
+                           Grid.Row="1"
+                           Text="1 USD = 0 CNY"
+                           FontSize="14"
+                           Foreground="#646D7D"
+                           Margin="4,0,0,0"
+                           MaxLines="1"
+                           TextTrimming="CharacterEllipsis" />
+
+                <Grid Grid.Row="2"
+                      ColumnDefinitions="*,*,*,84"
+                      RowDefinitions="*,*,*,*"
+                      RowSpacing="8"
+                      ColumnSpacing="8">
+                    <Button Grid.Row="0" Grid.Column="0" Content="7" Tag="7" Click="OnInputButtonClick" />
+                    <Button Grid.Row="0" Grid.Column="1" Content="8" Tag="8" Click="OnInputButtonClick" />
+                    <Button Grid.Row="0" Grid.Column="2" Content="9" Tag="9" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="1" Grid.Column="0" Content="4" Tag="4" Click="OnInputButtonClick" />
+                    <Button Grid.Row="1" Grid.Column="1" Content="5" Tag="5" Click="OnInputButtonClick" />
+                    <Button Grid.Row="1" Grid.Column="2" Content="6" Tag="6" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="2" Grid.Column="0" Content="1" Tag="1" Click="OnInputButtonClick" />
+                    <Button Grid.Row="2" Grid.Column="1" Content="2" Tag="2" Click="OnInputButtonClick" />
+                    <Button Grid.Row="2" Grid.Column="2" Content="3" Tag="3" Click="OnInputButtonClick" />
+
+                    <Button Grid.Row="3" Grid.Column="0" Content="00" Tag="00" Click="OnInputButtonClick" />
+                    <Button Grid.Row="3" Grid.Column="1" Content="0" Tag="0" Click="OnInputButtonClick" />
+                    <Button Grid.Row="3" Grid.Column="2" Content="." Tag="." Click="OnInputButtonClick" />
+
+                    <Button x:Name="ClearButton"
+                            Grid.Row="0"
+                            Grid.RowSpan="2"
+                            Grid.Column="3"
+                            Content="AC"
+                            Background="#D9DDE4"
+                            Tag="AC"
+                            Click="OnInputButtonClick" />
+
+                    <Button x:Name="BackspaceButton"
+                            Grid.Row="2"
+                            Grid.RowSpan="2"
+                            Grid.Column="3"
+                            Content="⌫"
+                            Background="#D9DDE4"
+                            Tag="BACK"
+                            Click="OnInputButtonClick" />
+                </Grid>
+
+                <TextBlock x:Name="StatusTextBlock"
+                           Grid.RowSpan="3"
+                           IsVisible="False"
+                           Text="Loading"
+                           Foreground="#5E6677"
+                           FontSize="15"
+                           HorizontalAlignment="Center"
+                           VerticalAlignment="Center" />
+            </Grid>
+        </Viewbox>
+    </Border>
+</UserControl>

LanMountainDesktop/Views/Components/ExchangeRateCalculatorWidget.axaml.cs

@@ -0,0 +1,347 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+public partial class ExchangeRateCalculatorWidget : UserControl, IDesktopComponentWidget, IRecommendationInfoAwareComponentWidget, ICalculatorInfoAwareComponentWidget
+{
+    private sealed record CurrencyItem(string Code, string ZhName, string EnName);
+
+    private static readonly FontFamily MiSansFontFamily = new("MiSans VF, avares://LanMountainDesktop/Assets/Fonts#MiSans");
+    private static readonly CurrencyItem[] CurrencyItems =
+    [
+        new("USD", "美元", "US Dollar"),
+        new("CNY", "人民币", "Chinese Yuan"),
+        new("EUR", "欧元", "Euro"),
+        new("JPY", "日元", "Japanese Yen"),
+        new("HKD", "港币", "Hong Kong Dollar"),
+        new("GBP", "英镑", "British Pound")
+    ];
+
+    private static readonly IRecommendationInfoService DefaultRecommendationService = new RecommendationDataService();
+    private static readonly ICalculatorDataService DefaultCalculatorService = new CalculatorDataService();
+
+    private readonly DispatcherTimer _refreshTimer = new()
+    {
+        Interval = TimeSpan.FromMinutes(30)
+    };
+
+    private readonly AppSettingsService _settingsService = new();
+    private readonly LocalizationService _localizationService = new();
+    private IRecommendationInfoService _recommendationService = DefaultRecommendationService;
+    private ICalculatorDataService _calculatorDataService = DefaultCalculatorService;
+
+    private string _languageCode = "zh-CN";
+    private string _fromCurrency = "USD";
+    private string _toCurrency = "CNY";
+    private string _inputText = "100";
+    private decimal _currentRate = 0m;
+    private CancellationTokenSource? _refreshCts;
+    private double _currentCellSize = 48d;
+    private bool _isAttached;
+    private bool _isRefreshing;
+
+    public ExchangeRateCalculatorWidget()
+    {
+        InitializeComponent();
+
+        FromCurrencyCodeTextBlock.FontFamily = MiSansFontFamily;
+        FromCurrencyNameTextBlock.FontFamily = MiSansFontFamily;
+        ToCurrencyCodeTextBlock.FontFamily = MiSansFontFamily;
+        ToCurrencyNameTextBlock.FontFamily = MiSansFontFamily;
+        InputAmountTextBlock.FontFamily = MiSansFontFamily;
+        ConvertedAmountTextBlock.FontFamily = MiSansFontFamily;
+        RateTextBlock.FontFamily = MiSansFontFamily;
+        StatusTextBlock.FontFamily = MiSansFontFamily;
+
+        AttachedToVisualTree += OnAttachedToVisualTree;
+        DetachedFromVisualTree += OnDetachedFromVisualTree;
+        SizeChanged += OnSizeChanged;
+        _refreshTimer.Tick += OnRefreshTimerTick;
+
+        ApplyCellSize(_currentCellSize);
+        UpdateLanguageCode();
+        UpdateCurrencyLabels();
+        UpdateAmounts();
+        ApplyLoadingState();
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        _currentCellSize = Math.Max(1, cellSize);
+        var scale = ResolveScale();
+        RootBorder.CornerRadius = new CornerRadius(Math.Clamp(34 * scale, 14, 48));
+        RootBorder.Padding = new Thickness(Math.Clamp(12 * scale, 6, 18));
+    }
+
+    public void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService)
+    {
+        _recommendationService = recommendationInfoService ?? DefaultRecommendationService;
+        if (_isAttached)
+        {
+            _ = RefreshExchangeRateAsync(forceRefresh: false);
+        }
+    }
+
+    public void SetCalculatorDataService(ICalculatorDataService calculatorDataService)
+    {
+        _calculatorDataService = calculatorDataService ?? DefaultCalculatorService;
+        UpdateAmounts();
+    }
+
+    private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = true;
+        _refreshTimer.Start();
+        _ = RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
+    {
+        _isAttached = false;
+        _refreshTimer.Stop();
+        CancelRefreshRequest();
+    }
+
+    private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
+    {
+        ApplyCellSize(_currentCellSize);
+    }
+
+    private async void OnRefreshTimerTick(object? sender, EventArgs e)
+    {
+        await RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private async void OnSwapCurrencyButtonClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        _ = sender;
+        var from = _fromCurrency;
+        _fromCurrency = _toCurrency;
+        _toCurrency = from;
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+    }
+
+    private async void OnFromCurrencyRowPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        _fromCurrency = GetNextCurrencyCode(_fromCurrency, _toCurrency);
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+        e.Handled = true;
+    }
+
+    private async void OnToCurrencyRowPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        _ = sender;
+        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            return;
+        }
+
+        _toCurrency = GetNextCurrencyCode(_toCurrency, _fromCurrency);
+        UpdateCurrencyLabels();
+        await RefreshExchangeRateAsync(forceRefresh: false);
+        e.Handled = true;
+    }
+
+    private void OnInputButtonClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        if (sender is not Button button || button.Tag is null)
+        {
+            return;
+        }
+
+        var token = button.Tag.ToString() ?? string.Empty;
+        _inputText = _calculatorDataService.ApplyInputToken(_inputText, token);
+        UpdateAmounts();
+        e.Handled = true;
+    }
+
+    private async Task RefreshExchangeRateAsync(bool forceRefresh)
+    {
+        if (!_isAttached || _isRefreshing)
+        {
+            return;
+        }
+
+        _isRefreshing = true;
+        UpdateLanguageCode();
+
+        var cts = new CancellationTokenSource();
+        var previous = Interlocked.Exchange(ref _refreshCts, cts);
+        previous?.Cancel();
+        previous?.Dispose();
+
+        try
+        {
+            var query = new ExchangeRateQuery(
+                BaseCurrency: _fromCurrency,
+                TargetCurrency: _toCurrency,
+                ForceRefresh: forceRefresh);
+            var result = await _recommendationService.GetExchangeRateAsync(query, cts.Token);
+            if (!_isAttached || cts.IsCancellationRequested)
+            {
+                return;
+            }
+
+            if (!result.Success || result.Data is null)
+            {
+                ApplyFailedState();
+                return;
+            }
+
+            _currentRate = result.Data.Rate;
+            StatusTextBlock.IsVisible = false;
+            UpdateAmounts();
+        }
+        catch (OperationCanceledException)
+        {
+            // Ignore canceled requests.
+        }
+        catch
+        {
+            if (_isAttached && !cts.IsCancellationRequested)
+            {
+                ApplyFailedState();
+            }
+        }
+        finally
+        {
+            if (ReferenceEquals(_refreshCts, cts))
+            {
+                _refreshCts = null;
+            }
+
+            cts.Dispose();
+            _isRefreshing = false;
+        }
+    }
+
+    private void UpdateCurrencyLabels()
+    {
+        var from = ResolveCurrency(_fromCurrency);
+        var to = ResolveCurrency(_toCurrency);
+
+        FromCurrencyCodeTextBlock.Text = from.Code;
+        FromCurrencyNameTextBlock.Text = IsZh() ? from.ZhName : from.EnName;
+        ToCurrencyCodeTextBlock.Text = to.Code;
+        ToCurrencyNameTextBlock.Text = IsZh() ? to.ZhName : to.EnName;
+    }
+
+    private void UpdateAmounts()
+    {
+        var amount = _calculatorDataService.ParseAmountOrZero(_inputText);
+        var converted = amount * Math.Max(0m, _currentRate);
+
+        InputAmountTextBlock.Text = _inputText;
+        ConvertedAmountTextBlock.Text = _calculatorDataService.FormatAmount(converted, maxFractionDigits: 4);
+        RateTextBlock.Text = string.Format(
+            CultureInfo.InvariantCulture,
+            "1 {0} = {1} {2}",
+            _fromCurrency,
+            _calculatorDataService.FormatAmount(_currentRate, maxFractionDigits: 6),
+            _toCurrency);
+    }
+
+    private void ApplyLoadingState()
+    {
+        StatusTextBlock.Text = L("exchange.widget.loading", "正在加载汇率...");
+        StatusTextBlock.IsVisible = true;
+    }
+
+    private void ApplyFailedState()
+    {
+        StatusTextBlock.Text = L("exchange.widget.fetch_failed", "汇率获取失败");
+        StatusTextBlock.IsVisible = true;
+        UpdateAmounts();
+    }
+
+    private void UpdateLanguageCode()
+    {
+        try
+        {
+            var snapshot = _settingsService.Load();
+            _languageCode = _localizationService.NormalizeLanguageCode(snapshot.LanguageCode);
+        }
+        catch
+        {
+            _languageCode = "zh-CN";
+        }
+    }
+
+    private string GetNextCurrencyCode(string current, string avoid)
+    {
+        var currentIndex = Array.FindIndex(
+            CurrencyItems,
+            item => string.Equals(item.Code, current, StringComparison.OrdinalIgnoreCase));
+        if (currentIndex < 0)
+        {
+            currentIndex = 0;
+        }
+
+        for (var step = 1; step <= CurrencyItems.Length; step++)
+        {
+            var next = CurrencyItems[(currentIndex + step) % CurrencyItems.Length].Code;
+            if (!string.Equals(next, avoid, StringComparison.OrdinalIgnoreCase))
+            {
+                return next;
+            }
+        }
+
+        return current;
+    }
+
+    private static CurrencyItem ResolveCurrency(string code)
+    {
+        return CurrencyItems.FirstOrDefault(item =>
+            string.Equals(item.Code, code, StringComparison.OrdinalIgnoreCase))
+            ?? CurrencyItems[0];
+    }
+
+    private bool IsZh()
+    {
+        return string.Equals(_languageCode, "zh-CN", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private string L(string key, string fallback)
+    {
+        return _localizationService.GetString(_languageCode, key, fallback);
+    }
+
+    private double ResolveScale()
+    {
+        var cellScale = Math.Clamp(_currentCellSize / 48d, 0.72, 1.8);
+        var widthScale = Bounds.Width > 1 ? Math.Clamp(Bounds.Width / 304d, 0.72, 2.0) : 1;
+        var heightScale = Bounds.Height > 1 ? Math.Clamp(Bounds.Height / 304d, 0.72, 2.0) : 1;
+        return Math.Clamp(Math.Min(cellScale, Math.Min(widthScale, heightScale)), 0.72, 1.95);
+    }
+
+    private void CancelRefreshRequest()
+    {
+        var cts = Interlocked.Exchange(ref _refreshCts, null);
+        if (cts is null)
+        {
+            return;
+        }
+
+        cts.Cancel();
+        cts.Dispose();
+    }
+}

LanMountainDesktop/Views/Components/IDesktopComponentWidget.cs

@@ -23,6 +23,11 @@ public interface IRecommendationInfoAwareComponentWidget
     void SetRecommendationInfoService(IRecommendationInfoService recommendationInfoService);
 }
 
+public interface ICalculatorInfoAwareComponentWidget
+{
+    void SetCalculatorDataService(ICalculatorDataService calculatorDataService);
+}
+
 public interface IDesktopPageVisibilityAwareComponentWidget
 {
     void SetDesktopPageContext(bool isOnActivePage, bool isEditMode);

LanMountainDesktop/Views/MainWindow.ComponentSystem.cs

@@ -725,12 +725,6 @@ public partial class MainWindow
             return;
         }
 
-        if (placement.ComponentId == BuiltInComponentIds.DesktopDailySentence)
-        {
-            OpenDailySentenceComponentSettings();
-            return;
-        }
-
         if (placement.ComponentId == BuiltInComponentIds.DesktopCnrDailyNews)
         {
             OpenCnrDailyNewsComponentSettings();
@@ -840,22 +834,6 @@ public partial class MainWindow
         ComponentSettingsWindow.Opacity = 1;
     }
 
-    private void OpenDailySentenceComponentSettings()
-    {
-        if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
-        {
-            return;
-        }
-
-        var settingsContent = new DailySentenceSettingsWindow();
-        settingsContent.SettingsChanged += OnDailySentenceSettingsChanged;
-        ComponentSettingsContentHost.Content = settingsContent;
-
-        ComponentSettingsWindow.IsVisible = true;
-        ComponentSettingsWindow.Opacity = 0;
-        ComponentSettingsWindow.Opacity = 1;
-    }
-
     private void OpenCnrDailyNewsComponentSettings()
     {
         if (ComponentSettingsWindow is null || ComponentSettingsContentHost is null)
@@ -976,30 +954,6 @@ public partial class MainWindow
         PersistSettings();
     }
 
-    private void OnDailySentenceSettingsChanged(object? sender, EventArgs e)
-    {
-        _ = sender;
-        _ = e;
-
-        foreach (var pageGrid in _desktopPageComponentGrids.Values)
-        {
-            foreach (var host in pageGrid.Children.OfType<Border>())
-            {
-                if (!host.Classes.Contains(DesktopComponentHostClass))
-                {
-                    continue;
-                }
-
-                if (TryGetContentHost(host)?.Child is DailySentenceWidget widget)
-                {
-                    widget.RefreshFromSettings();
-                }
-            }
-        }
-
-        PersistSettings();
-    }
-
     private void OnCnrDailyNewsSettingsChanged(object? sender, EventArgs e)
     {
         _ = sender;
@@ -1056,11 +1010,6 @@ public partial class MainWindow
             worldClockSettingsWindow.SettingsChanged -= OnWorldClockSettingsChanged;
         }
 
-        if (ComponentSettingsContentHost?.Content is DailySentenceSettingsWindow dailySentenceSettingsWindow)
-        {
-            dailySentenceSettingsWindow.SettingsChanged -= OnDailySentenceSettingsChanged;
-        }
-
         if (ComponentSettingsContentHost?.Content is CnrDailyNewsSettingsWindow cnrDailyNewsSettingsWindow)
         {
             cnrDailyNewsSettingsWindow.SettingsChanged -= OnCnrDailyNewsSettingsChanged;
@@ -1469,14 +1418,6 @@ public partial class MainWindow
                 new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
         }
 
-        if (string.Equals(componentId, BuiltInComponentIds.DesktopDailySentence, StringComparison.OrdinalIgnoreCase))
-        {
-            // Keep daily sentence widget at a 2:1 ratio: 4x2, 6x3, 8x4...
-            return SnapSpanToScaleRules(
-                span,
-                new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
-        }
-
         if (string.Equals(componentId, BuiltInComponentIds.DesktopCnrDailyNews, StringComparison.OrdinalIgnoreCase))
         {
             // Keep CNR widget at a 2:1 ratio: 4x2, 6x3, 8x4...
@@ -1485,6 +1426,22 @@ public partial class MainWindow
                 new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
         }
 
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopBilibiliHotSearch, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep Bilibili hot search widget at a 2:1 ratio: 4x2, 6x3, 8x4...
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 2, HeightUnit: 1, MinScale: 2));
+        }
+
+        if (string.Equals(componentId, BuiltInComponentIds.DesktopExchangeRateCalculator, StringComparison.OrdinalIgnoreCase))
+        {
+            // Keep exchange rate converter square with minimum size 4x4.
+            return SnapSpanToScaleRules(
+                span,
+                new ComponentScaleRule(WidthUnit: 1, HeightUnit: 1, MinScale: 4));
+        }
+
         if (string.Equals(componentId, BuiltInComponentIds.DesktopStudyNoiseCurve, StringComparison.OrdinalIgnoreCase))
         {
             // Keep noise curve widget in a 2:1 ratio with minimum 4x2.
@@ -1722,7 +1679,8 @@ public partial class MainWindow
             _currentDesktopCellSize,
             _timeZoneService,
             _weatherDataService,
-            _recommendationInfoService);
+            _recommendationInfoService,
+            _calculatorDataService);
         component.Classes.Add(DesktopComponentClass);
         return component;
     }
@@ -2648,6 +2606,11 @@ public partial class MainWindow
             return Symbol.Apps;
         }
 
+        if (string.Equals(categoryId, "Calculator", StringComparison.OrdinalIgnoreCase))
+        {
+            return Symbol.Calculator;
+        }
+
         if (string.Equals(categoryId, "Study", StringComparison.OrdinalIgnoreCase))
         {
             return Symbol.Apps;
@@ -2688,6 +2651,11 @@ public partial class MainWindow
             return L("component_category.info", "Info");
         }
 
+        if (string.Equals(categoryId, "Calculator", StringComparison.OrdinalIgnoreCase))
+        {
+            return L("component_category.calculator", "Calculator");
+        }
+
         if (string.Equals(categoryId, "Study", StringComparison.OrdinalIgnoreCase))
         {
             return L("component_category.study", "Study");
@@ -2856,7 +2824,8 @@ public partial class MainWindow
                 renderCellSize,
                 _timeZoneService,
                 _weatherDataService,
-                _recommendationInfoService);
+                _recommendationInfoService,
+                _calculatorDataService);
 
             var previewSurface = new Border
             {

LanMountainDesktop/Views/MainWindow.axaml.cs

@@ -94,6 +94,7 @@ public partial class MainWindow : Window
     private readonly GitHubReleaseUpdateService _releaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
     private readonly IWeatherDataService _weatherDataService = new XiaomiWeatherService();
     private readonly IRecommendationInfoService _recommendationInfoService = new RecommendationDataService();
+    private readonly ICalculatorDataService _calculatorDataService = new CalculatorDataService();
     private readonly ComponentRegistry _componentRegistry = ComponentRegistry
         .CreateDefault()
         .RegisterExtensions(