XAML代码中的函数调用？

Question

我想在我的所有TextBox控件上设置一个样式,它在接收键盘焦点时执行以下操作:

1)更改背景颜色
2)调用.SelectAll()以突出显示所有文本

到目前为止我有这个:

<Style TargetType="TextBox">
<Style.Triggers>
            <Trigger Property="IsKeyboardFocusWithin" Value="True">
                <Setter Property="Background">
                    <Setter.Value>
                        <SolidColorBrush Color="#FFFFD1D9"/>
                    </Setter.Value>
                </Setter>
           </Trigger>
</Style.Triggers>
</Style>

还有办法打电话.SelectAll() 吗？谢谢.

Answer 1

您可以使用附加行为执行此操作.

例

public static class TextBoxBehaviour
{
    public static bool GetSelectAll(TextBoxBase target)
    {
        return (bool)target.GetValue(SelectAllAttachedProperty);
    }

    public static void SetSelectAll(TextBoxBase target, bool value)
    {
        target.SetValue(SelectAllAttachedProperty, value);
    }

    public static readonly DependencyProperty SelectAllAttachedProperty = DependencyProperty.RegisterAttached("SelectAll", typeof(bool), typeof(TextBoxBehaviour), new UIPropertyMetadata(false, OnSelectAllAttachedPropertyChanged));

    static void OnSelectAllAttachedPropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
    {
        ((TextBoxBase)o).SelectAll();
    }
}

用法

<Style TargetType="{x:Type TextBox}" xmlns:behaviours="clr-namespace:Controls.Behaviours">
  <Style.Triggers>
      <Trigger Property="IsKeyboardFocusWithin" Value="True">
          <Setter Property="Background" Value="#FFFFD1D9"/>
          <Setter Property="behaviours:TextBoxBehaviour.SelectAll" Value="True"/>
     </Trigger>
  </Style.Triggers>
</Style>

参考

• 约什史密斯关于附加行为

注意:在理论上无法测试上述实现,尽管它应该只是工作™.

HTH,