Question

我愿着重谈谈具体的<代码>Text Box,并只有在用户发布一些关键(1,2,3等)时,才接受关键媒体。

Senario:

我有<代码>ListView(反映一种习俗观点)。名单见Text Box。

请允许我说,载有编号为1、2、3、33、373等的项目。

Now when I press a number key, lets say Key 3, the following action should occur:

Focus that Specific TextBox
Append the TextBox text with the number input
Select the item in the ListView with the same number as TextBox.Text has

My Xaml for what I tried

<ListView Name="lv"
              Grid.Row="1"
              ItemsSource="{Binding}"
              View="{Binding Path=SelectedItem,
                             ElementName=viewComboBox}" DisplayMemberPath="Name" IsTextSearchEnabled="True" TextSearch.TextPath="{Binding Path=Person.Name}"/>
    <TextBox  Grid.Row="2" Text="{Binding Path=TextSearch.Text,ElementName=lv}"></TextBox>

<代码>TextBox没有显示任何情况,我不知道如何处理数字关键新闻。

I need this and its bewildering using MVVM...

在这方面,任何帮助都是巨大的。使用守则的某些指导甚至更好...... ......

Answer 1

这种逻辑是特别的。如果你将它放在法典上的话,它会受到罚款。跨国激进党没有阻止你在后面的法典中看到具体守则。

然而,如果你在宗教上不遵循该做法背后的守则,你可以创建Behavior,并将该守则列入其中。你们的行为将附在清单箱中,并作为财产使用文字箱。它将听取名单框上的关键性活动,并在文本框中添加关键内容。

你的逻辑确实与这一点一样。

Answer 2

If you are using MVVM then attached behavior is the way to go ... http://eladm.wordpress.com/2009/04/02/attached-behavior/

Name you key press source element like ListView ...

<ListView x:Name="MyListView">
   ....
</ListView>

Declare and define an attached property of type ListView say NumericKeyPressBehavior.FocusTarget

The Source for this FocusTarget will be you MyListView and the behavior will be attached to your TextBox

 <TextBox local:NumericKeyPressBehavior.FocusTarget="{Binding ElementName=MyListView}" 
          .... />

In NumericKeyPressBehavior.FocusTarget s dependency property changed event handler, handle the key press on the ListView and then based on if a numeric key was pressed, focus the target TextBox and also append the pressed key character to it.

private static void  OnFocusTargetChanged(
    DependencyObject o, 
    DependencyPropertyChangedEventArgs e)
{
    var textBox = o as TextBox;
    var listView = e.NewValue as ListView;
    if (textBox != null && listView != null)
    {
        listView.KeyUp += 
         (o1, e1) =>
            {
                var keyChar = GetKeyCharFromKeyCode(e1.Key);
                if ("0123456789".Contains(keyChar.ToString()))
                {
                    textBox.Focus();
                    textBox.Text += keyChar.ToString();
                }
            }
    }
}

GetKeyCharFromKeyCode is found here.... C# How to translate virtual keycode to char?

Does this help?

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