44 lines
1.6 KiB
C#
44 lines
1.6 KiB
C#
using System.Globalization;
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using System.Windows.Data;
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namespace NeumUI.Converters.Internal;
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/// <summary>
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/// 该转换器实现了IMultiValueConverter接口，用于将值转换为范围宽度。它主要用于进度条或滑块控件中，根据当前值、最小值和最大值来计算并返回一个宽度值。
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/// 通过传入的参数（以字符串形式），可以额外指定边距，该边距会从总宽度中减去。最终返回的宽度基于当前值在最小值与最大值之间的比例，并且考虑了调整后的实际宽度。
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/// </summary>
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internal class ValueToRangeWidthConverter : IMultiValueConverter
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{
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public static readonly ValueToRangeWidthConverter Instance = new();
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public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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{
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var paramStr = parameter as string;
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_ = double.TryParse(paramStr, out var margin);
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var minimum = (double)values[0];
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var maximum = (double)values[1];
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var currentValue = (double)values[2];
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var width = (double)values[3];
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var actualWidth = width - 2 * margin;
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if (actualWidth < 0)
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{
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actualWidth = 0;
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}
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if (currentValue < minimum)
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{
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return 0;
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}
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if (currentValue > maximum)
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{
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return actualWidth;
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}
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return ((currentValue - minimum) / (maximum - minimum)) * actualWidth;
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}
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public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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{
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throw new NotImplementedException();
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}
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} |