如何绑定到兄弟控件的属性？

Question

在项目列表框中，可以将一个项目指定为主项目。在模板中，我有一个绑定到参数化命令的按钮（集合中的特定项目是传递给数据上下文中的命令的参数），仅当该项目当前不是主要项目时才可见。如果该项目是主要项目，我想显示静态图像。由于我无法将图像绑定到命令我正在绑定按钮，我想我可以将图像的可见性属性绑定到可见性 "inverse" 21=] 的按钮。（即当按钮可见时，图像被隐藏，反之亦然。）但我不知道该怎么做。该按钮是模板内网格内图像的兄弟。这是我的模板...

<DataTemplate>
  <StackPanel Orientation="Vertical">
    <Grid>
      <Grid.ColumnDefinitions>
      ...
      </Grid.ColumnDefinitions>

      <TextBlock Grid.Column="0" Text="{Binding Path=FormattedNumber}" Style="{StaticResource FieldDataTextBlock}" FontWeight="Bold" />
      <!-- How can I make this image aware of the following button's state? -->
      <Image Grid.Column="2" Source="/Resources/Star.Pressed.png" Visibility="{Binding RelativeSource={RelativeSource AncestorType=Grid}, Path={}}" Width="20" Height="20" />
      <Button Grid.Column="2" x:Name="btnMakePrimary" Style="{StaticResource StarButton}" Command="{Binding ElementName=lstPhoneNumbers, Path=DataContext.MakePrimaryPhoneNumberCommand}" CommandParameter="{Binding}" ToolTip="Set as display number." Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Converter={StaticResource BoolVisibility}}" />
      <Button Grid.Column="4" Style="{StaticResource DetailsButton}" Command="{Binding ElementName=lstPhoneNumbers, Path=DataContext.ViewPhoneNumberCommand}" CommandParameter="{Binding}" />
      <Button Grid.Column="6" Style="{StaticResource DeleteButton}" Command="{Binding ElementName=lstPhoneNumbers, Path=DataContext.DeletePhoneNumberCommand}" CommandParameter="{Binding}" />
    </Grid>
    <Grid >
      <Grid.ColumnDefinitions>
      ...
      </Grid.ColumnDefinitions>

      <TextBlock Grid.Column="0" Text="{Binding Path=PhoneTypeString}" Style="{StaticResource FieldDataTextBlock}" />
      <TextBlock Grid.Column="2" Text="(notes)" Foreground="Blue" ToolTip="{Binding Path=PhoneNumberNote}" Visibility="{Binding Path=HasNote, Converter={StaticResource BoolVisibility}}" />
    </Grid>
  </StackPanel>
</DataTemplate>

要么，要么有没有办法将图像绑定到父数据上下文中采用参数的方法？

谢谢。

J

Answer 1

没关系...我能够通过绑定的 ElementName 属性实现它，并修复了包含的图像资源的问题，该问题扰乱了我的视觉效果：

<Button Grid.Column="2" Name="btnMakePrimary" Style="{StaticResource StarButton}" Command="{Binding ElementName=lstPhoneNumbers, Path=DataContext.MakePrimaryPhoneNumberCommand}" CommandParameter="{Binding}" ToolTip="Set as display number." Visibility="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}, Converter={StaticResource BoolVisibility}}" />
<Image Grid.Column="2" Source="/Resources/Star.Pressed.png" Visibility="{Binding ElementName=btnMakePrimary, Path=IsEnabled, Converter={StaticResource BoolVisibilityReverse}}" Width="20" Height="20" />

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