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annotate MetroWpf/MetroWpf.Xaml/Converters/DoubleToGridLengthConverter.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(double), typeof(GridLength))]
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9 public sealed class DoubleToGridLengthConverter : IValueConverter
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10 {
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11 public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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12 {
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13 if (!(value is double))
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14 {
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15 return new GridLength(0.0, GridUnitType.Auto);
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16 }
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17
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18 var unitType = parameter as string;
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19
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20 switch (unitType)
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21 {
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22 case "Auto":
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23 return new GridLength(0.0, GridUnitType.Auto);
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24 case "*":
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25 return new GridLength((double)value, GridUnitType.Star);
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26 default:
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27 return new GridLength((double)value, GridUnitType.Pixel);
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28 }
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29 }
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30
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31 public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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32 {
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33 var unitType = parameter as string;
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34
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35 if (!(value is GridLength))
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36 {
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37 return DependencyProperty.UnsetValue;
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38 }
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39
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40 var length = (GridLength)value;
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41 switch (unitType)
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42 {
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43 case "Auto":
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44 return length.IsAuto ? length.Value : DependencyProperty.UnsetValue;
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45 case "*":
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46 return length.IsStar ? length.Value : DependencyProperty.UnsetValue;
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47 default:
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48 return length.IsAbsolute ? length.Value : DependencyProperty.UnsetValue;
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49 }
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50 }
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51 }
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52 } ;