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annotate Chronosv2/source/Presentation/Controls/Interactivity/Behaviors/Watermark/PasswordBoxWatermarkBehavior.cs @ 10:443821e55f06

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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1 using System;
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2 using System.Windows;
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3 using System.Windows.Controls;
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4 using System.Windows.Controls.Primitives;
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5 using Chronos.Presentation.Controls.Adorner;
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6 using Chronos.Presentation.Controls.Events;
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7
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8 namespace Chronos.Presentation.Controls.Interactivity.Behaviors
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9 {
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10 /// <summary>
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11 /// http://blindmeis.wordpress.com/2010/07/16/wpf-watermark-textbox-behavior/
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12 /// </summary>
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13 public sealed class PasswordBoxWatermarkBehavior
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14 : System.Windows.Interactivity.Behavior<PasswordBox>
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15 {
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16 #region · Attached Properties ·
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17
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18 public static readonly DependencyProperty LabelProperty =
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19 DependencyProperty.RegisterAttached("Label", typeof(string), typeof(PasswordBoxWatermarkBehavior));
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20
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21 public static readonly DependencyProperty LabelStyleProperty =
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22 DependencyProperty.RegisterAttached("LabelStyle", typeof(Style), typeof(PasswordBoxWatermarkBehavior));
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23
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24 #endregion
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25
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26 #region · Fields ·
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27
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28 private TextBlockAdorner adorner;
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29 private WeakPropertyChangeNotifier notifier;
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30
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31 #endregion
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32
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33 #region · Properties ·
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34
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35 public string Label
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36 {
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37 get { return (string)base.GetValue(LabelProperty); }
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38 set { base.SetValue(LabelProperty, value); }
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39 }
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40
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41 public Style LabelStyle
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42 {
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43 get { return (Style)base.GetValue(LabelStyleProperty); }
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44 set { base.SetValue(LabelStyleProperty, value); }
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45 }
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46
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47 #endregion
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48
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49 #region · Overriden Methods ·
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50
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51 protected override void OnAttached()
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52 {
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53 base.OnAttached();
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54
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55 this.AssociatedObject.Loaded += this.AssociatedObjectLoaded;
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56 this.AssociatedObject.PasswordChanged += this.AssociatedObjectPasswordChanged;
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57 }
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58
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59 protected override void OnDetaching()
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60 {
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61 base.OnDetaching();
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62 this.AssociatedObject.Loaded -= this.AssociatedObjectLoaded;
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63 this.AssociatedObject.PasswordChanged -= this.AssociatedObjectPasswordChanged;
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64
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65 this.notifier = null;
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66 }
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67
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68 #endregion
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69
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70 #region · Private Methods ·
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71
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72 private void AssociatedObjectPasswordChanged(object sender, System.Windows.RoutedEventArgs e)
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73 {
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74 this.UpdateAdorner();
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75 }
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76
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77 private void AssociatedObjectLoaded(object sender, System.Windows.RoutedEventArgs e)
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78 {
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79 this.adorner = new TextBlockAdorner(this.AssociatedObject, this.Label, this.LabelStyle);
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80
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81 this.UpdateAdorner();
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82
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83 //AddValueChanged for IsFocused in a weak manner
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84 this.notifier = new WeakPropertyChangeNotifier(this.AssociatedObject, UIElement.IsFocusedProperty);
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85 this.notifier.ValueChanged += new EventHandler(this.UpdateAdorner);
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86 }
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87
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88 private void UpdateAdorner(object sender, EventArgs e)
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89 {
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90 this.UpdateAdorner();
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91 }
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92
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93 private void UpdateAdorner()
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94 {
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95 if (!String.IsNullOrEmpty(this.AssociatedObject.Password) || this.AssociatedObject.IsFocused)
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96 {
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97 // Hide the Watermark Label if the adorner layer is visible
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98 this.AssociatedObject.TryRemoveAdorners<TextBlockAdorner>();
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99 }
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100 else
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101 {
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102 // Show the Watermark Label if the adorner layer is visible
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103 this.AssociatedObject.TryAddAdorner<TextBlockAdorner>(adorner);
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104 }
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105 }
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106
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107 #endregion
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108 }
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109 }