WPF中的分段文本框

时间:2011-01-23 02:51:53

标签: wpf textbox wpf-controls

是否有人知道可以执行此类操作的免费或商业WPF控件:

alt text

每盒X个字符,并在完成每个方框时自动切换到下一个方框?与为Microsoft产品输入许可证密钥的方式类似。

我认为从头开始做起来并不是特别困难,但如果已经存在一个很好的例子,我想避免重新发明轮子。

1 个答案:

答案 0 :(得分:4)

WPF提供您所需要的一切,除了自动切换到下一个控件。行为可以提供该功能,结果如下所示:

<Grid>
    <Grid.Resources>
        <local:KeyTextCollection x:Key="keys"/>
    </Grid.Resources>
    <StackPanel>
        <ItemsControl ItemsSource="{StaticResource keys}" Focusable="False">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" Background="AliceBlue"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <TextBox Text="{Binding Text}" Margin="5" MaxLength="4" Width="40">
                        <i:Interaction.Behaviors>
                            <local:TextBoxBehavior AutoTab="True" SelectOnFocus="True"/>
                        </i:Interaction.Behaviors>
                    </TextBox>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </StackPanel>
</Grid>

以下是KeyText和KeyTextCollection类(根据品味调整):

class KeyText
{
    public string Text { get; set; }
}

class KeyTextCollection : List<KeyText>
{
    public KeyTextCollection()
    {
        for (int i = 0; i < 4; i++) Add(new KeyText { Text = "" });
    }
}

这是实现自动选项卡和选择焦点的行为:

public class TextBoxBehavior : Behavior<TextBox>
{
    public bool SelectOnFocus
    {
        get { return (bool)GetValue(SelectOnFocusProperty); }
        set { SetValue(SelectOnFocusProperty, value); }
    }

    public static readonly DependencyProperty SelectOnFocusProperty = 
        DependencyProperty.Register("SelectOnFocus", typeof(bool), typeof(TextBoxBehavior), new UIPropertyMetadata(false));

    public bool AutoTab
    {
        get { return (bool)GetValue(AutoTabProperty); }
        set { SetValue(AutoTabProperty, value); }
    }

    public static readonly DependencyProperty AutoTabProperty =
        DependencyProperty.Register("AutoTab", typeof(bool), typeof(TextBoxBase), new UIPropertyMetadata(false));

    protected override void OnAttached()
    {
        AssociatedObject.PreviewGotKeyboardFocus += (s, e) =>
        {
            if (SelectOnFocus)
            {
                Action action = () => AssociatedObject.SelectAll();
                AssociatedObject.Dispatcher.BeginInvoke(action, DispatcherPriority.ContextIdle);
            }
        };
        AssociatedObject.TextChanged += (s, e) =>
        {
            if (AutoTab)
            {
                if (AssociatedObject.Text.Length == AssociatedObject.MaxLength &&
                    AssociatedObject.SelectionStart == AssociatedObject.MaxLength)
                {
                    AssociatedObject.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
                }
            }
        };
    }
}

如果您不熟悉行为,请安装Expression Blend 4 SDK并添加此命名空间:

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

并将System.Windows.Interactivity添加到您的项目中。