附加行为在Silverlight中的所有文本框 [英] Attach behaviour to all TextBoxes in Silverlight

问题描述

是否有可能行为附加到文本框都在Silverlight应用程序？

我需要简单的功能添加到所有的文本框。
（选择焦点事件的所有文字）

 无效Target_GotFocus（对象发件人，System.Windows.RoutedEventArgs E）
 {
 Target.SelectAll（）; 
} 
  

解决方案

您可以覆盖默认风格在您的应用程序文本框。然后在这个风格，你可以用一些方法来申请用（一般采用附加属性）二传手行为

这会是这样的：

 < Application.Resources> 
<风格的TargetType =文本框> 
< setter属性=本地：TextBoxEx.SelectAllOnFocusVALUE =真/> 
< /样式和GT; 
< /Application.Resources> 
  

行为实施：

 公共类TextBoxSelectAllOnFocusBehavior：行为<&文本框GT; 
 {
保护覆盖无效OnAttached（）
 {
 base.OnAttached（）; 
 
 this.AssociatedObject.GotMouseCapture + = this.OnGotFocus; 
 this.AssociatedObject.GotKeyboardFocus + = this.OnGotFocus; 
} 
 
保护覆盖无效OnDetaching（）
 {
 base.OnDetaching（）; 
 
 this.AssociatedObject.GotMouseCapture  -  = this.OnGotFocus; 
 this.AssociatedObject.GotKeyboardFocus  -  = this.OnGotFocus; 
} 
 
公共无效OnGotFocus（对象发件人，EventArgs参数）
 {
 this.AssociatedObject.SelectAll（）; 
} 
} 
  

和附加属性，以帮助我们的行为：

 公共静态类TextBoxEx 
 {
公共静态布尔GetSelectAllOnFocus（DependencyObject的OBJ）
 { 
回报（布尔）obj.GetValue（SelectAllOnFocusProperty）; 
} 
公共静态无效SetSelectAllOnFocus（OBJ的DependencyObject，布尔值）
 {
 obj.SetValue（SelectAllOnFocusProperty，值）; 
} 
公共静态只读的DependencyProperty SelectAllOnFocusProperty = 
 DependencyProperty.RegisterAttached（SelectAllOnFocus的typeof（布尔）的typeof（TextBoxSelectAllOnFocusBehaviorExtension），新PropertyMetadata（假，OnSelectAllOnFocusChanged））; 
 
 
私有静态无效OnSelectAllOnFocusChanged（DependencyObject的发件人，DependencyPropertyChangedEventArgs参数）
 {
 VAR行为= Interaction.GetBehaviors（寄件人）; 
 
 //删除现有的行为实例
的foreach（VAR老在behaviors.OfType< TextBoxSelectAllOnFocusBehavior方式>（）ToArray的（））
 behaviors.Remove（旧）; 
 
如果（（布尔）args.NewValue）
 {
 //创建一个新的行为，重视目标
 VAR行为=新TextBoxSelectAllOnFocusBehavior（）; 
 
 //应用行为
 behaviors.Add（行为）; 
} 
} 
} 
  

Is it possible to attach behavior to all TextBoxes in Silverlight application?

I need to add simple functionality to all text boxes. (select all text on focus event)

 void Target_GotFocus(object sender, System.Windows.RoutedEventArgs e)
    {
        Target.SelectAll();
    }

解决方案

You can override the default style for TextBoxes in your app. Then in this style, you can use some approach to apply a behavior with a setter (generally using attached properties).

It would something like this:

<Application.Resources>
    <Style TargetType="TextBox">
        <Setter Property="local:TextBoxEx.SelectAllOnFocus" Value="True"/>
    </Style>
</Application.Resources>

The behavior implementation:

public class TextBoxSelectAllOnFocusBehavior : Behavior<TextBox>
{
    protected override void OnAttached()
    {
        base.OnAttached();

        this.AssociatedObject.GotMouseCapture += this.OnGotFocus;
        this.AssociatedObject.GotKeyboardFocus += this.OnGotFocus;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();

        this.AssociatedObject.GotMouseCapture -= this.OnGotFocus;
        this.AssociatedObject.GotKeyboardFocus -= this.OnGotFocus;
    }

    public void OnGotFocus(object sender, EventArgs args)
    {
        this.AssociatedObject.SelectAll();
    }
}

And the attached property to help us apply the behavior:

public static class TextBoxEx
{
    public static bool GetSelectAllOnFocus(DependencyObject obj)
    {
        return (bool)obj.GetValue(SelectAllOnFocusProperty);
    }
    public static void SetSelectAllOnFocus(DependencyObject obj, bool value)
    {
        obj.SetValue(SelectAllOnFocusProperty, value);
    }
    public static readonly DependencyProperty SelectAllOnFocusProperty =
        DependencyProperty.RegisterAttached("SelectAllOnFocus", typeof(bool), typeof(TextBoxSelectAllOnFocusBehaviorExtension), new PropertyMetadata(false, OnSelectAllOnFocusChanged));


    private static void OnSelectAllOnFocusChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
    {
        var behaviors = Interaction.GetBehaviors(sender);

        // Remove the existing behavior instances
        foreach (var old in behaviors.OfType<TextBoxSelectAllOnFocusBehavior>().ToArray())
            behaviors.Remove(old);

        if ((bool)args.NewValue)
        {
            // Creates a new behavior and attaches to the target
            var behavior = new TextBoxSelectAllOnFocusBehavior();

            // Apply the behavior
            behaviors.Add(behavior);
        }
    }
}

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