Question

我有一个使用TreeView和HierarchiacalDataTemplate的WPF。当我为不同级别设置样式时，有时文本的前景色为白色，有时为黑色（取决于背景色）。这就是我的困境。当用户选择树视图中的项目时，wpf应用边框（这很好）并更改文本的前景色。对于已经具有白色前景的项目，它很好，但对于具有黑色前景的项目，文本虚拟消失。我无法真正使用属性设置器和触发器，因为该样式并不普遍适用于所有节点，只适用于某些节点。如何在所有OnSelection上禁用WPF以更改前景色？下面是我的WPF代码：

        <TreeView Name="tvwConfig" VerticalAlignment="Stretch" DockPanel.Dock="Left" Width="300" Background="LightGray" ItemsSource="{Binding}" SelectedItemChanged="Treeview_SelectedItemChanged" >
        <TreeView.Resources>
            <HierarchicalDataTemplate DataType="{x:Type cfg:AppConfig}" ItemsSource="{Binding Path=Services}">
                <Border Width="200" BorderBrush="DarkBlue" Background="DarkBlue" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=ServerName}" FontWeight="Bold" Foreground="White" />
                    </StackPanel>
                </Border>
            </HierarchicalDataTemplate>
            <HierarchicalDataTemplate DataType="{x:Type cfg:Service}" ItemsSource="{Binding Path=Queues}">
                <Border Width="200" BorderBrush="RoyalBlue" Background="RoyalBlue" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" Foreground="White" />
                        <TextBlock Text=" (" FontWeight="Bold" Foreground="White" />
                        <TextBlock Text="{Binding Path=Modality}" FontWeight="Bold" Foreground="White" />
                        <TextBlock Text=")" FontWeight="Bold" Foreground="White" />
                    </StackPanel>
                </Border>
            </HierarchicalDataTemplate>
            <HierarchicalDataTemplate DataType="{x:Type cfg:Queue}" ItemsSource="{Binding Path=Statuses}">
                <Border Width="200" BorderBrush="AliceBlue" Background="AliceBlue" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
                    <StackPanel Orientation="Horizontal" >
                        <TextBlock Text="{Binding Path=Name}" FontWeight="SemiBold" />
                    </StackPanel>
                </Border>
            </HierarchicalDataTemplate>
            <HierarchicalDataTemplate DataType="{x:Type cfg:Status}">
                <Border Width="200" BorderBrush="White" Background="White" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Name}" />
                        <TextBlock Text=" ("/>
                        <TextBlock Text="{Binding Path=Weight}" />
                        <TextBlock Text=")" />
                    </StackPanel>
                </Border>
            </HierarchicalDataTemplate>
        </TreeView.Resources>
    </TreeView>

Answer 1

在参考资料中设置此样式。不要设置任何键，它将应用于满足条件的所有TreeViewItem。示例代码：

<Style TargetType="TreeViewItem">
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="true">
                    <Setter Property="Foreground" Value="White"/>
                </Trigger>
           </Style.Triggers>
        </Style>

Answer 2

我现在无法对此进行测试，但我认为您应该能够在Style中为ItemContainerStyle定义HierarchicalDataTemplate并定义样式（使用setter ）根据需要在每一个。

例如（来自你的一个例子）：

<HierarchicalDataTemplate DataType="{x:Type cfg:AppConfig}" ItemsSource="{Binding Path=Services}">
<!-- Example -->
<HierarchicalDataTemplate.ItemContainerStyle>
    <Style TargetType="{x:Type TreeViewItem}">
        <Setter Property="FontWeight" Value="Normal" />
        <Setter Property="Foreground" Value="DarkOrange" />
        <!-- Triggers if required -->
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="FontWeight" Value="Bold" />
                <Setter Property="Foreground" Value="DarkOrange" />
            </Trigger>
        <!-- DataTriggers if required -->
            <DataTrigger Binding="{Binding Path=SomeProperty}" Value="SomeValue">
                <Setter Property="Foreground" Value="Red" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<!-- End Example -->

    <Border Width="200" BorderBrush="DarkBlue" Background="DarkBlue" BorderThickness="1" CornerRadius="2" Margin="2" Padding="2">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=ServerName}" FontWeight="Bold" Foreground="White" />
        </StackPanel>
    </Border>
</HierarchicalDataTemplate>

IsSelected setter可以帮助您整理前景色。

WPF：在选择时禁用前景更改

2 个答案: