Behavior与View交互的用法

1 "TestApp.Views.TestView"
2 xmlns&＃61;"http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x&＃61;"http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:mc&＃61;"http://schemas.openxmlformats.org/markup-compatibility/2006"
5 xmlns:d&＃61;"http://schemas.microsoft.com/expression/blend/2008"
6 xmlns:i&＃61;"http://schemas.microsoft.com/expression/2010/interactivity"
7 xmlns:behavior&＃61;"clr-namespace:TestApp.Behaviors"
8 mc:Ignorable&＃61;"d"
9 d:DesignWidth&＃61;"1280" d:DesignHeight&＃61;"874">
10
11 "Horizontal" VerticalAlignment&＃61;"Top">
12 "tbTest"/>
13 "20,0,0,0" Content&＃61;"delete">
14
15 "true" AttachedTextBox&＃61;"{Binding ElementName&＃61;tbTest}"/>
16
17
18 "20,0,0,0" Content&＃61;"clear">
19
20 "false" AttachedTextBox&＃61;"{Binding ElementName&＃61;tbTest}"/>
21
22
23
24
25

1 using System.Windows;
2 using System.Windows.Controls;
3 using System.Windows.Interactivity;
4
5 namespace TestApp.Behaviors
6 {
7 public class TextOperationBehavior : Behavior
8 {
9 public static readonly DependencyProperty AttachedTextBoxProperty &＃61; DependencyProperty.Register("AttachedTextBox", typeof(TextBox), typeof(TextOperationBehavior));
10 public static readonly DependencyProperty IsDeleteProperty &＃61; DependencyProperty.Register("IsDelete", typeof(bool), typeof(TextOperationBehavior));
11
12 public TextBox AttachedTextBox
13 {
14 get { return (TextBox)GetValue(AttachedTextBoxProperty); }
15 set { SetValue(AttachedTextBoxProperty, value); }
16 }
17
18 public bool IsDelete
19 {
20 get { return (bool)GetValue(IsDeleteProperty); }
21 set { SetValue(IsDeleteProperty, value); }
22 }
23
24
25 protected override void OnAttached()
26 {
27 base.OnAttached();
28 if (AssociatedObject !&＃61; null)
29 {
30 AssociatedObject.Click &＃43;&＃61; new RoutedEventHandler(AssociatedObject_Click);
31 }
32 }
33
34 private void AssociatedObject_Click(object sender, RoutedEventArgs e)
35 {
36 if (AttachedTextBox !&＃61; null && !string.IsNullOrEmpty(AttachedTextBox.Text))
37 {
38 if (IsDelete)
39 {
40 int index &＃61; 0;
41 if (AttachedTextBox.IsFocused)
42 {
43 index &＃61; AttachedTextBox.SelectionStart;
44 }
45 else
46 {
47 index &＃61; AttachedTextBox.Text.Length;
48 }
49 AttachedTextBox.Focus();
50 AttachedTextBox.Select(index, 0);
51 System.Windows.Forms.SendKeys.SendWait("{BACKSPACE}");
52 }
53 else
54 {
55 AttachedTextBox.Text &＃61; string.Empty;
56 }
57 }
58 }
59
60 protected override void OnDetaching()
61 {
62 base.OnDetaching();
63 }
64 }
65 }