add:i18n
This commit is contained in:
@@ -5,22 +5,13 @@ using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Threading;
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using System.Windows.Markup;
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using System.Windows.Media.TextFormatting;
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using System.Windows.Media.Imaging;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Shapes;
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using System.Windows.Data;
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using System.Windows.Ink;
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using System.Windows.Interop;
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using System.Windows.Media.Animation;
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using System.Windows.Navigation;
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namespace Ink_Canvas.Helpers
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{
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/// <summary>
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/// 让 TextBlock 在可用宽度不足时自动缩小字号（只缩小不放大），用于避免英文等长文本被截断。
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/// Automatically shrinks text to fit available width.
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/// Supports TextBlock and Label.
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/// Only shrinks, never enlarges above MaxFontSize.
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/// </summary>
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public static class AutoFontSizeHelper
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{
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@@ -76,170 +67,247 @@ namespace Ink_Canvas.Helpers
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private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var tb = d as TextBlock;
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if (tb == null) return;
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if (!(d is FrameworkElement fe)) return;
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if (!(fe is TextBlock) && !(fe is Label)) return;
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if ((bool)e.NewValue)
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{
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tb.SizeChanged += TextBlock_OnSizeChanged;
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tb.Loaded += TextBlock_OnLoaded;
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tb.Unloaded += TextBlock_OnUnloaded;
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fe.SizeChanged += Element_OnSizeChanged;
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fe.Loaded += Element_OnLoaded;
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fe.Unloaded += Element_OnUnloaded;
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TryHookContentChanged(fe, true);
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try
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{
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var dpd = DependencyPropertyDescriptor.FromProperty(TextBlock.TextProperty, typeof(TextBlock));
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dpd?.AddValueChanged(tb, TextBlock_OnTextChanged);
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}
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catch
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{
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// 忽略：极端情况下 descriptor 可能不可用
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}
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// 让第一次布局完成后再做一次调整（避免 ActualWidth=0）
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tb.Dispatcher.BeginInvoke(new Action(() => TryAdjust(tb)), DispatcherPriority.Loaded);
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fe.Dispatcher.BeginInvoke(new Action(() => TryAdjust(fe)), DispatcherPriority.Loaded);
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}
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else
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{
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tb.SizeChanged -= TextBlock_OnSizeChanged;
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tb.Loaded -= TextBlock_OnLoaded;
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tb.Unloaded -= TextBlock_OnUnloaded;
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try
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{
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var dpd = DependencyPropertyDescriptor.FromProperty(TextBlock.TextProperty, typeof(TextBlock));
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dpd?.RemoveValueChanged(tb, TextBlock_OnTextChanged);
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}
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catch
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{
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}
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fe.SizeChanged -= Element_OnSizeChanged;
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fe.Loaded -= Element_OnLoaded;
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fe.Unloaded -= Element_OnUnloaded;
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TryHookContentChanged(fe, false);
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}
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}
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private static void OnSizingPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is TextBlock tb && GetIsEnabled(tb))
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if (d is FrameworkElement fe && GetIsEnabled(fe))
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{
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tb.Dispatcher.BeginInvoke(new Action(() => TryAdjust(tb)), DispatcherPriority.Loaded);
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fe.Dispatcher.BeginInvoke(new Action(() => TryAdjust(fe)), DispatcherPriority.Loaded);
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}
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}
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private static void TextBlock_OnLoaded(object sender, RoutedEventArgs e)
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private static void Element_OnLoaded(object sender, RoutedEventArgs e)
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{
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if (sender is TextBlock tb) tb.Dispatcher.BeginInvoke(new Action(() => TryAdjust(tb)), DispatcherPriority.Loaded);
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}
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private static void TextBlock_OnUnloaded(object sender, RoutedEventArgs e)
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{
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// 这里不做额外处理；事件解绑由 IsEnabled 关闭或对象销毁处理
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}
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private static void TextBlock_OnSizeChanged(object sender, SizeChangedEventArgs e)
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{
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if (sender is TextBlock tb) TryAdjust(tb);
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}
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private static void TextBlock_OnTextChanged(object sender, EventArgs e)
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{
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if (sender is TextBlock tb) tb.Dispatcher.BeginInvoke(new Action(() => TryAdjust(tb)), DispatcherPriority.Loaded);
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}
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private static void TryAdjust(TextBlock tb)
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{
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if (tb == null) return;
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if (!GetIsEnabled(tb)) return;
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if (GetIsAdjusting(tb)) return;
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// 没有可用宽度时跳过
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var availableWidth = tb.ActualWidth;
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if (double.IsNaN(availableWidth) || availableWidth <= 1) return;
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// 文本为空时不需要调整
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var text = tb.Text;
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if (string.IsNullOrEmpty(text)) return;
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var min = GetMinFontSize(tb);
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if (double.IsNaN(min) || min <= 0) min = 6d;
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var step = GetStep(tb);
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if (double.IsNaN(step) || step <= 0.01) step = 0.5d;
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var max = GetMaxFontSize(tb);
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if (double.IsNaN(max) || max <= 0)
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if (sender is FrameworkElement fe)
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{
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max = tb.FontSize;
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fe.Dispatcher.BeginInvoke(new Action(() => TryAdjust(fe)), DispatcherPriority.Loaded);
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}
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}
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if (double.IsNaN(max) || max <= 0) return;
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private static void Element_OnUnloaded(object sender, RoutedEventArgs e)
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{
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// No extra cleanup required here.
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}
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// 只做“缩小不放大”
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var startFont = Math.Min(tb.FontSize, max);
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if (startFont < min) startFont = min;
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private static void Element_OnSizeChanged(object sender, SizeChangedEventArgs e)
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{
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if (sender is FrameworkElement fe) TryAdjust(fe);
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}
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SetIsAdjusting(tb, true);
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private static void Element_OnTextChanged(object sender, EventArgs e)
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{
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if (sender is FrameworkElement fe)
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{
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fe.Dispatcher.BeginInvoke(new Action(() => TryAdjust(fe)), DispatcherPriority.Loaded);
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}
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}
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private static void TryHookContentChanged(FrameworkElement fe, bool add)
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{
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try
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{
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// 如果当前已合适，直接回到 max（但不超过原本 fontSize），避免之前缩小后再变短不恢复
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// 注意：恢复也只在不超过 max 的范围内
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var desiredAtMax = MeasureTextWidth(tb, text, max);
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DependencyPropertyDescriptor dpd = null;
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if (fe is TextBlock)
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{
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dpd = DependencyPropertyDescriptor.FromProperty(TextBlock.TextProperty, typeof(TextBlock));
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}
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else if (fe is Label)
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{
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dpd = DependencyPropertyDescriptor.FromProperty(ContentControl.ContentProperty, typeof(ContentControl));
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}
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if (dpd == null) return;
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if (add) dpd.AddValueChanged(fe, Element_OnTextChanged);
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else dpd.RemoveValueChanged(fe, Element_OnTextChanged);
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}
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catch
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{
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// Ignore descriptor issues in rare runtime cases.
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}
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}
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private static void TryAdjust(FrameworkElement fe)
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{
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if (fe == null) return;
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if (!GetIsEnabled(fe)) return;
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if (GetIsAdjusting(fe)) return;
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var text = GetElementText(fe);
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if (string.IsNullOrEmpty(text)) return;
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var availableWidth = GetAvailableWidth(fe);
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if (double.IsNaN(availableWidth) || availableWidth <= 1) return;
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var min = GetMinFontSize(fe);
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if (double.IsNaN(min) || min <= 0) min = 6d;
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var step = GetStep(fe);
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if (double.IsNaN(step) || step < 0.1) step = 0.5d;
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var current = GetElementFontSize(fe);
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if (double.IsNaN(current) || current <= 0) return;
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var max = GetMaxFontSize(fe);
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if (double.IsNaN(max) || max <= 0) max = current;
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var startFont = Math.Min(current, max);
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if (startFont < min) startFont = min;
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SetIsAdjusting(fe, true);
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try
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{
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var desiredAtMax = MeasureTextWidth(fe, text, max);
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if (desiredAtMax > 0 && desiredAtMax <= availableWidth + 0.5)
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{
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if (tb.FontSize != max) tb.FontSize = max;
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if (Math.Abs(current - max) > 0.01) SetElementFontSize(fe, max);
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return;
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}
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double font = startFont;
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double desired = MeasureTextWidth(tb, text, font);
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var font = startFont;
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var desired = MeasureTextWidth(fe, text, font);
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if (desired <= 0) return;
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// 逐步减小直到适配或触底
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while (font > min && desired > availableWidth + 0.5)
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{
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font = Math.Max(min, font - step);
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desired = MeasureTextWidth(tb, text, font);
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desired = MeasureTextWidth(fe, text, font);
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if (desired <= 0) break;
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}
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if (!double.IsNaN(font) && font > 0 && Math.Abs(tb.FontSize - font) > 0.01)
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if (!double.IsNaN(font) && font > 0 && Math.Abs(current - font) > 0.01)
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{
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tb.FontSize = font;
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SetElementFontSize(fe, font);
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}
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}
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finally
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{
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SetIsAdjusting(tb, false);
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SetIsAdjusting(fe, false);
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}
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}
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private static double MeasureTextWidth(TextBlock tb, string text, double fontSize)
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private static string GetElementText(FrameworkElement fe)
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{
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if (fe is TextBlock tb) return tb.Text;
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if (fe is Label label) return label.Content as string ?? label.Content?.ToString();
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return null;
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}
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private static double GetElementFontSize(FrameworkElement fe)
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{
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if (fe is TextBlock tb) return tb.FontSize;
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if (fe is Label label) return label.FontSize;
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return double.NaN;
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}
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private static void SetElementFontSize(FrameworkElement fe, double value)
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{
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if (fe is TextBlock tb) tb.FontSize = value;
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else if (fe is Label label) label.FontSize = value;
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}
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private static double GetAvailableWidth(FrameworkElement fe)
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{
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double width = double.PositiveInfinity;
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if (fe.ActualWidth > 1) width = Math.Min(width, fe.ActualWidth);
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if (fe.Parent is FrameworkElement parent && parent.ActualWidth > 1)
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{
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var parentWidth = parent.ActualWidth - fe.Margin.Left - fe.Margin.Right;
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if (parentWidth > 1) width = Math.Min(width, parentWidth);
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}
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if (double.IsInfinity(width) || double.IsNaN(width) || width <= 1) return -1;
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// Keep width as inner text area.
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if (fe is Control control)
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{
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width -= control.Padding.Left + control.Padding.Right;
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width -= control.BorderThickness.Left + control.BorderThickness.Right;
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}
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else if (fe is Border border)
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{
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width -= border.Padding.Left + border.Padding.Right;
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width -= border.BorderThickness.Left + border.BorderThickness.Right;
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}
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return width;
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}
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private static double MeasureTextWidth(FrameworkElement fe, string text, double fontSize)
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{
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try
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{
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var dpi = VisualTreeHelper.GetDpi(tb);
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var dpi = VisualTreeHelper.GetDpi(fe);
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var culture = CultureInfo.CurrentUICulture;
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// 使用 TextBlock 自身的语言/流向
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if (tb.Language != null)
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if (fe.Language != null)
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{
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try
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{
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culture = tb.Language.GetEquivalentCulture();
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culture = fe.Language.GetEquivalentCulture();
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}
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catch
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{
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}
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}
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var typeface = new Typeface(tb.FontFamily, tb.FontStyle, tb.FontWeight, tb.FontStretch);
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var fontFamily = SystemFonts.MessageFontFamily;
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var fontStyle = FontStyles.Normal;
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var fontWeight = FontWeights.Normal;
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var fontStretch = FontStretches.Normal;
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Brush foreground = Brushes.Black;
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var flowDirection = FlowDirection.LeftToRight;
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if (fe is TextBlock tb)
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{
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fontFamily = tb.FontFamily;
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fontStyle = tb.FontStyle;
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fontWeight = tb.FontWeight;
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fontStretch = tb.FontStretch;
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foreground = tb.Foreground;
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flowDirection = tb.FlowDirection;
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}
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else if (fe is Label label)
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{
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fontFamily = label.FontFamily;
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fontStyle = label.FontStyle;
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fontWeight = label.FontWeight;
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fontStretch = label.FontStretch;
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foreground = label.Foreground;
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flowDirection = label.FlowDirection;
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}
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var typeface = new Typeface(fontFamily, fontStyle, fontWeight, fontStretch);
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var formatted = new FormattedText(
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text,
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culture,
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tb.FlowDirection,
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flowDirection,
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typeface,
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fontSize,
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tb.Foreground,
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foreground,
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dpi.PixelsPerDip);
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// 这里用包含尾随空白的宽度更接近实际布局
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return formatted.WidthIncludingTrailingWhitespace;
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}
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catch
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@@ -249,4 +317,3 @@ namespace Ink_Canvas.Helpers
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}
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}
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}
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