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annotate MetroWpf/MetroWpf.Xaml/Converters/DoubleToThicknessConverter.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(Thickness))]
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9 public sealed class DoubleToThicknessConverter : 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 DependencyProperty.UnsetValue;
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16 }
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17
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18 var parameters = parameter as string;
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19 if (parameters != null)
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20 {
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21 var propertyNames = parameters.Split(new[] { ", " }, StringSplitOptions.RemoveEmptyEntries);
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22 if (propertyNames.Length > 0)
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23 {
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24 var thickness = new Thickness(0);
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25
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26 var changed = false;
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27
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28 foreach (var propertyName in propertyNames)
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29 {
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30 switch (propertyName)
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31 {
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32 case "Left":
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33 thickness.Left = (double)value;
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34 changed = true;
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35 break;
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36 case "Top":
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37 thickness.Top = (double)value;
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38 changed = true;
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39 break;
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40 case "Right":
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41 thickness.Right = (double)value;
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42 changed = true;
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43 break;
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44 case "Bottom":
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45 thickness.Bottom = (double)value;
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46 changed = true;
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47 break;
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48 }
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49 }
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50
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51 if (changed)
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52 {
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53 return thickness;
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54 }
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55 }
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56 }
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57
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58 return new Thickness((double)value);
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59 }
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60
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61 public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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62 {
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63 if (!(value is Thickness))
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64 {
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65 return DependencyProperty.UnsetValue;
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66 }
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67
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68 var thickness = (Thickness)value;
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69
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70 var propertyName = parameter as string;
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71 switch (propertyName)
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72 {
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73 case "Left":
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74 return thickness.Left;
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75 case "Top":
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76 return thickness.Top;
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77 case "Right":
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78 return thickness.Right;
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79 case "Bottom":
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80 return thickness.Bottom;
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81 default:
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82 return (thickness.Left + thickness.Top + thickness.Bottom + thickness.Right) / 4;
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83 }
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84 }
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85 }
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86 } ;