我有一个ListView控件,其中包含系统消息列表,以及一个相应的“操作”按钮,可帮助我的用户解析消息:
如果消息是错误消息,我希望文本的前景和操作按钮([更多...]部分)变为红色。正如你所看到的,它并没有这样做。
我正在使用绑定到消息数据的Severity的Style.Trigger来设置Foreground。这适用于DataTemplate中的TextBlock,但无法影响该模板中的Button。我的XAML看起来像这样:
<ListView x:Name="ImageCenterStatus" Background="{DynamicResource SC.ControlBrush}" Margin="10,22,10,0" FontSize="12" Grid.Column="1" ClipToBounds="True" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock TextWrapping="WrapWithOverflow" cal:Message.Attach="[Event MouseUp] = [Action DoStatusAction($dataContext)]" Text="{Binding Path=DisplayedMessage}"/>
<Button x:Name="ActionButton" Content="{Binding Path=DisplayedActionLabel}" FontSize="12" cal:Message.Attach="DoStatusAction($dataContext)" Style="{DynamicResource SC.ActionButtonHack}"></Button>
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Severity}" Value="Warning">
<Setter Property="Foreground" Value="#FFCE7A16" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=Severity}" Value="Error">
<Setter Property="Foreground" Value="#FFD13636" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListView.ItemContainerStyle>
</ListView>
Button有自己的Style,SC.ActionButtonHack,但我非常小心,不要在样式的任何地方覆盖Foreground:
<Style x:Key="SC.ActionButtonHack" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<ContentPresenter x:Name="contentPresenter" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
为什么DataTemplate中的TextBlock会响应Trigger中的Foreground更改,而不响应Button? 我需要做什么才能让按钮尊重前景变化?
答案 0 :(得分:1)
将ContentPresenter的TextElement.Foreground
绑定到ListViewItem's foreground
以使其正常运行:
<Style x:Key="SC.ActionButtonHack" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<ContentPresenter x:Name="contentPresenter"
TextElement.Foreground="{Binding Foreground,
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType=ListViewItem}}"
HorizontalAlignment="Center"
VerticalAlignment="Center" Margin="0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
OR
将它绑定在Button本身上:
<Button x:Name="ActionButton"
Foreground="{Binding Foreground, RelativeSource={RelativeSource
Mode=FindAncestor, AncestorType=ListViewItem}}"
Content="{Binding Path=Name}" FontSize="12"
Style="{DynamicResource SC.ActionButtonHack}"/>