50 lines
1.8 KiB
C#
50 lines
1.8 KiB
C#
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using HandyControl.Data;
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using System.Globalization;
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using System.Windows;
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using System.Windows.Data;
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namespace YY.Admin.Core.Converter
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{
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/// <summary>
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/// 根据 TitleWidth 计算 Margin.Left，如果 TitlePlacement=Top 则不偏移
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/// </summary>
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public class NegativeLeftThicknessConverter : IMultiValueConverter
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{
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// 这里改成 MultiBinding，方便同时拿 TitleWidth 和 TitlePlacement
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public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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{
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double left = 0;
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double bottomShift = -18;
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if (parameter != null && double.TryParse(parameter.ToString(), out var p))
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bottomShift = p;
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// 如果 TitleWidth 还未设置，直接返回默认 Thickness
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if (values.Length > 0 && values[0] != DependencyProperty.UnsetValue)
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{
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var widthValue = values[0];
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if (widthValue is GridLength gridLength && gridLength.IsAbsolute)
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left = gridLength.Value;
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else if (widthValue is double d)
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left = d;
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}
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// 如果 TitlePlacement 还未设置，也要避免异常
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if (values.Length > 1 && values[1] != DependencyProperty.UnsetValue)
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{
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if (values[1] is TitlePlacementType placement)
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{
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// 如果标题在上方，则不偏移
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if (placement == TitlePlacementType.Top)
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left = 0;
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}
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}
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return new Thickness(left, 0, 0, bottomShift);
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}
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public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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=> throw new NotSupportedException();
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}
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}
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