0

我正在创建一个可以通过遥控器或键盘控制的 wpf 应用程序。我正在尝试创建一个组合框，当焦点移到它时，文本会发光。通过单击遥控器上的确定（或在键盘上输入），将出现下拉菜单，允许用户做出选择。为了使键盘导航工作，我创建了一个扩展组合框的自定义控件。一切正常，但我在设计它时遇到了麻烦。我希望 ComboBox 成为具有上述发光效果的文本框，但我无法确定触发器的放置位置。在下面的 Xaml 中，我收到一个错误，即找不到“FlowMenuComboBoxContentTemplateGlow”。我也无法确定我需要在文本框中绑定什么以显示所选项目的文本。任何人都可以帮忙吗？谢谢

<!--Flow Menu Text-->
<Style x:Key="FlowMenuText"
       TargetType="TextBlock">
    <Setter Property="Foreground"
            Value="LightGray" />
    <Setter Property="FontFamily"
            Value="Segoe UI Light, Lucida Sans Unicode, Verdana" />
    <Setter Property="FontSize"
            Value="24" />
    <Setter Property="TextOptions.TextHintingMode"
            Value="Animated" />
</Style>
<!--Flow Menu KN ComboBox ContentTemplate-->
<DataTemplate x:Key="FlowMenuComboBoxContentTemplate">
    <TextBlock Text="WHAT SHOULD I BIND TO?" Style="{DynamicResource FlowMenuText}">
        <TextBlock.Effect>
            <DropShadowEffect x:Name="FlowMenuComboBoxContentTemplateGlow" BlurRadius="8" Color="LightGray" ShadowDepth="0" Opacity="0" />
        </TextBlock.Effect>
    </TextBlock>
</DataTemplate>
<!--Flow Menu KNComboBox-->
<Style x:Key="FlowMenuComboBox"
       TargetType="ComboBox">
    <Setter Property="BorderBrush"
            Value="{x:Null}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ComboBox}">
                <Grid x:Name="MainGrid" SnapsToDevicePixels="true">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <Popup x:Name="Popup" AllowsTransparency="true" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">

                        <Border x:Name="DropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">

                            <ScrollViewer x:Name="DropDownScrollViewer">
                                <Grid RenderOptions.ClearTypeHint="Enabled">
                                    <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
                                        <Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=DropDownBorder}" Height="{Binding ActualHeight, ElementName=DropDownBorder}" Width="{Binding ActualWidth, ElementName=DropDownBorder}"/>
                                    </Canvas>
                                    <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                </Grid>
                            </ScrollViewer>
                        </Border>
                    </Popup>
                    <ContentPresenter ContentTemplate="{DynamicResource FlowMenuComboBoxContentTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" 
                                      Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" 
                                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="true" Margin="{TemplateBinding Padding}" 
                                      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Grid>
                <!-- THIS CURRENTLY THROWS AN ERROR
                <ControlTemplate.Triggers>
                    <EventTrigger RoutedEvent="GotFocus">
                        <EventTrigger.Actions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxContentTemplateGlow" Storyboard.TargetProperty="Opacity" From="0" 
                               To="1" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger.Actions>
                    </EventTrigger>
                    <EventTrigger RoutedEvent="LostFocus">
                        <EventTrigger.Actions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxContentTemplateGlow" Storyboard.TargetProperty="Opacity" From="1" 
                               To="0" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger.Actions>
                    </EventTrigger>
                </ControlTemplate.Triggers>-->
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
4

1 回答 1

0

将触发器移动到 ItemTemplate 并使用相对源来获取组合框项的 isFocused 路径修复了此问题。

 <Setter Property="ItemTemplate">
        <Setter.Value>
            <DataTemplate>
                <Grid>
                    <Border x:Name="FlowMenuComboBoxItemTemplatePosterGlow" Style="{DynamicResource PosterBorder}" BorderThickness="1" Opacity="0">
                        <Border.Effect>
                            <BlurEffect KernelType="Gaussian" Radius="3" />
                        </Border.Effect>
                    </Border>
                    <Grid Margin="5,5,5,5">
                        <TextBlock Text="{Binding}" Style="{DynamicResource FlowMenuText}">
                    <TextBlock.Effect>
                        <DropShadowEffect x:Name="FlowMenuComboBoxItemTemplateGlow" BlurRadius="8" Color="LightGray" ShadowDepth="0" Opacity="0" />
                    </TextBlock.Effect>
                        </TextBlock>
                    </Grid>
                </Grid>
                <DataTemplate.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ComboBoxItem}},Path=IsFocused}" Value="True">
                        <DataTrigger.EnterActions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxItemTemplatePosterGlow" Storyboard.TargetProperty="Opacity" From="0" 
                               To="1" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxItemTemplateGlow" Storyboard.TargetProperty="Opacity" From="0" 
                               To="1" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                        </DataTrigger.EnterActions>
                        <DataTrigger.ExitActions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxItemTemplatePosterGlow" Storyboard.TargetProperty="Opacity" From="1" 
                               To="0" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="FlowMenuComboBoxItemTemplateGlow" Storyboard.TargetProperty="Opacity" From="1" 
                               To="0" Duration="0:0:0.5" />
                                </Storyboard>
                            </BeginStoryboard>
                        </DataTrigger.ExitActions>
                    </DataTrigger>
                </DataTemplate.Triggers>
            </DataTemplate>
        </Setter.Value>
    </Setter>
于 2012-04-30T16:04:18.757 回答