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annotate MetroWpf/MetroWpf.Xaml/Converters/GridLengthToDoubleConverter.cs @ 15:060f02cd4591

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author stevenh7776 stevenhollidge@hotmail.com
date Mon, 12 Mar 2012 23:05:21 +0800
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15
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1 using System;
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2 using System.Globalization;
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3 using System.Windows;
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4 using System.Windows.Data;
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5
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6 namespace MetroWpf.Xaml.Converters
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7 {
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8 [ValueConversion(typeof(GridLength), typeof(double))]
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9 public sealed class GridLengthToDoubleConverter : IValueConverter
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10 {
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11
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12 public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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13 {
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14 var unitType = parameter as string;
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15
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16 if (!(value is GridLength))
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17 {
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18 return DependencyProperty.UnsetValue;
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19 }
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20
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21 var length = (GridLength)value;
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22 switch (unitType)
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23 {
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24 case "Auto":
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25 return length.IsAuto ? length.Value : DependencyProperty.UnsetValue;
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26 case "*":
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27 return length.IsStar ? length.Value : DependencyProperty.UnsetValue;
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28 default:
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29 return length.IsAbsolute ? length.Value : DependencyProperty.UnsetValue;
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30 }
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31 }
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32
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33 public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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34 {
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35 if (!(value is double))
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36 {
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37 return new GridLength(0.0, GridUnitType.Auto);
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38 }
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39
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40 var unitType = parameter as string;
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41
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42 switch (unitType)
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43 {
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44 case "Auto":
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45 return new GridLength(0.0, GridUnitType.Auto);
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46 case "*":
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47 return new GridLength((double)value, GridUnitType.Star);
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48 default:
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49 return new GridLength((double)value, GridUnitType.Pixel);
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50 }
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51 }
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52 }
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53 } ;