XAML代码中的函数调用？ [英] Function call within XAML code?

问题描述

我想在所有TextBox控件上设置一种样式，使其在接收键盘焦点时执行以下操作：

I'd like to set a style on all my TextBox controls that does the following when it receives keyboard focus:

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，我已经知道了：

I have this so far:

<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>

是否也可以调用 .SelectAll（）？谢谢。

Is there a way to also call .SelectAll() ? Thanks.

推荐答案

您可以使用附加的行为来完成此操作。

You can do this using attached behaviours.

示例

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>

参考文献

• 乔什·史密斯（Josh Smith）的行为举止

• Josh Smith on Attached Behaviours

NB：理论上虽然可以正常工作，但它无法测试上述实现。

NB: Wasn't able to test the above implementation, in theory though it should just work™.

HTH，

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