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comparison Chronosv2/source/Presentation/Controls/Interactivity/Behaviors/Watermark/TextBoxWatermarkBehavior.cs @ 10:443821e55f06

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Initial cleaned up add from Codeplex files
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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9:904a9faadf8b 10:443821e55f06
1 using System;
2 using System.Windows;
3 using System.Windows.Controls;
4 using Chronos.Presentation.Controls.Adorner;
5 using Chronos.Presentation.Controls.Events;
6
7 namespace Chronos.Presentation.Controls.Interactivity.Behaviors
8 {
9 /// <summary>
10 /// http://blindmeis.wordpress.com/2010/07/16/wpf-watermark-textbox-behavior/
11 /// </summary>
12 public sealed class TextBoxWatermarkBehavior
13 : System.Windows.Interactivity.Behavior<TextBox>
14 {
15 #region · Attached Properties ·
16
17 public static readonly DependencyProperty LabelProperty =
18 DependencyProperty.RegisterAttached("Label", typeof(string), typeof(TextBoxWatermarkBehavior));
19
20 public static readonly DependencyProperty LabelStyleProperty =
21 DependencyProperty.RegisterAttached("LabelStyle", typeof(Style), typeof(TextBoxWatermarkBehavior));
22
23 #endregion
24
25 #region · Fields ·
26
27 private TextBlockAdorner adorner;
28 private WeakPropertyChangeNotifier notifier;
29
30 #endregion
31
32 #region · Properties ·
33
34 public string Label
35 {
36 get { return (string)base.GetValue(LabelProperty); }
37 set { base.SetValue(LabelProperty, value); }
38 }
39
40 public Style LabelStyle
41 {
42 get { return (Style)base.GetValue(LabelStyleProperty); }
43 set { base.SetValue(LabelStyleProperty, value); }
44 }
45
46 #endregion
47
48 #region · Overriden Methods ·
49
50 protected override void OnAttached()
51 {
52 base.OnAttached();
53
54 this.AssociatedObject.Loaded += this.AssociatedObjectLoaded;
55 this.AssociatedObject.TextChanged += this.AssociatedObjectTextChanged;
56 }
57
58 protected override void OnDetaching()
59 {
60 base.OnDetaching();
61
62 this.AssociatedObject.Loaded -= this.AssociatedObjectLoaded;
63 this.AssociatedObject.TextChanged -= this.AssociatedObjectTextChanged;
64
65 this.notifier = null;
66 }
67
68 #endregion
69
70 #region · Private Methods ·
71
72 private void AssociatedObjectTextChanged(object sender, TextChangedEventArgs e)
73 {
74 this.UpdateAdorner();
75 }
76
77 private void AssociatedObjectLoaded(object sender, System.Windows.RoutedEventArgs e)
78 {
79 this.adorner = new TextBlockAdorner(this.AssociatedObject, this.Label, this.LabelStyle);
80
81 this.UpdateAdorner();
82
83 //AddValueChanged for IsFocused in a weak manner
84 this.notifier = new WeakPropertyChangeNotifier(this.AssociatedObject, UIElement.IsFocusedProperty);
85 this.notifier.ValueChanged += new EventHandler(this.UpdateAdorner);
86 }
87
88 private void UpdateAdorner(object sender, EventArgs e)
89 {
90 this.UpdateAdorner();
91 }
92
93 private void UpdateAdorner()
94 {
95 if (!String.IsNullOrEmpty(this.AssociatedObject.Text) || this.AssociatedObject.IsFocused)
96 {
97 // Hide the Watermark Label if the adorner layer is visible
98 this.AssociatedObject.TryRemoveAdorners<TextBlockAdorner>();
99 }
100 else
101 {
102 // Show the Watermark Label if the adorner layer is visible
103 this.AssociatedObject.TryAddAdorner<TextBlockAdorner>(adorner);
104 }
105 }
106
107 #endregion
108 }
109 }