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annotate MetroWpf/MetroWpf.Xaml/Converters/ThicknessPositiveToNegativeConverter.cs @ 90:d523381be45a

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author stevenhollidge <stevenhollidge@hotmail.com>
date Mon, 30 Apr 2012 10:48:49 +0100
parents 060f02cd4591
children
rev   line source
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(Thickness), typeof(Thickness))]
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9 public class ThicknessPositiveToNegativeConverter : 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 Thickness))
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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 source = (Thickness)value;
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19
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20 var parameters = parameter as string;
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21 if (parameters != null)
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22 {
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23 var propertyNames = parameters.Split(new[] { ", " }, StringSplitOptions.RemoveEmptyEntries);
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24 if (propertyNames.Length > 0)
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25 {
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26 var thickness = new Thickness(0);
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27
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28 var changed = false;
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29
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30 foreach (var propertyName in propertyNames)
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31 {
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32 switch (propertyName)
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33 {
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34 case "Left":
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35 thickness.Left = -source.Left;
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36 changed = true;
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37 break;
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38 case "Top":
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39 thickness.Top = -source.Top;
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40 changed = true;
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41 break;
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42 case "Right":
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43 thickness.Right = -source.Right;
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44 changed = true;
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45 break;
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46 case "Bottom":
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47 thickness.Bottom = -source.Bottom;
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48 changed = true;
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49 break;
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50 }
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51 }
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52
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53 if (changed)
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54 {
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55 return thickness;
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56 }
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57 }
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58 }
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59
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60 return source;
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61 }
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62
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63 public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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64 {
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65 return Convert(value, targetType, parameter, culture);
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66 }
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67 }
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68 } ;