带有默认模板和itemTemplate的递归菜单项

Question

我有一个MenuItem类型的WPF控件模板:

<Style TargetType="{x:Type MenuItem}">
    <Setter Property="Background"
            Value="Transparent" />
    <Setter Property="Cursor"
            Value="Hand" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type MenuItem}">
                <Border Background="{TemplateBinding Background}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto" />
                        </Grid.ColumnDefinitions>
                        <ContentControl Content="{TemplateBinding Header}"
                                        Margin="5"
                                        Grid.Column="1" />
                        <Path Grid.Column="2"
                                x:Name="Indicator"
                                Data="M1,1 L1,9 9,5Z"
                                Fill="{StaticResource GlyphBrush}"
                                Margin="4"
                                Visibility="Hidden"
                                VerticalAlignment="Center" />
                        <Popup Name="PART_Popup"
                                Placement="Right"
                                IsOpen="{TemplateBinding IsSubmenuOpen}"
                                AllowsTransparency="True"
                                Grid.Column="0"
                                Grid.ColumnSpan="2"
                                HorizontalOffset="3"
                                VerticalOffset="-1">
                            <Border Background="Transparent">
                                <ContentControl Style="{StaticResource PopupContentStyle}">
                                    <ItemsPresenter/>
                                </ContentControl>
                            </Border>
                        </Popup>
                    </Grid>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsChecked"
                                Value="true">
                        <Setter Property="Background"
                                Value="{StaticResource ButtonHoverBackgroundBrush}" />
                    </Trigger>
                    <Trigger Property="IsChecked"
                                Value="false">
                        <Setter Property="Background"
                                Value="{StaticResource BackgroundBrush}" />
                    </Trigger>
                    <Trigger Property="HasItems"
                                Value="True">
                        <Setter TargetName="Indicator"
                                Property="Visibility"
                                Value="Visible" />
                    </Trigger>
                    <Trigger Property="IsEnabled"
                                Value="False">
                        <Setter Property="Opacity"
                                Value="{StaticResource DisabledTransparency}" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsMouseOver"
                    Value="True">
            <Setter Property="Background"
                    Value="{StaticResource ButtonHoverBackgroundBrush}" />
        </Trigger>
    </Style.Triggers>
</Style>

如果我现在添加项目到MenuItem模板工作完美无瑕.但是,如果我尝试将项目添加到一个边界ObservableCollection我会遇到问题,因为我ControlTemplate不使用ItemTemplate原始的MenuItem任何地方.

这种用法会导致问题:

<MenuItem Header="{userInterface:Translation Language}"
          ItemsSource="{Binding AvailableLanguages}">
    <MenuItem.ItemTemplate>
        <DataTemplate>
            <MenuItem Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.ChangeLanguageCommand}"
                      CommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=Header}"
                      Header="{Binding}" />
            </DataTemplate>
    </MenuItem.ItemTemplate>
</MenuItem>

在MenuItem不使用Template上述指定我,而不是它再次把我的默认模板.

我尝试将ItemsPresenter我的全局模板ItemsControl更改为a 但它确实没有改变任何内容.

我该如何解决这个问题？

Answer 1

ItemTemplate我通过将 更改为 a解决了这个ItemContainerStyle问题：这是结果：

    <MenuItem Header="{userInterface:Translation Language}"
                ItemsSource="{Binding AvailableLanguages}">
        <MenuItem.ItemContainerStyle>
            <Style TargetType="MenuItem"
                    BasedOn="{StaticResource {x:Type MenuItem}}">
                <Setter Property="Header"
                        Value="{Binding Name}" />
                <Setter Property="Command"
                        Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.ChangeLanguageCommand}" />
                <Setter Property="CommandParameter"
                        Value="{Binding RelativeSource={RelativeSource Self}, Path=DataContext}" />
                <Setter Property="IsChecked"
                        Value="{Binding IsSelected}">
                </Setter>
            </Style>
        </MenuItem.ItemContainerStyle>
    </MenuItem>

首先的问题ItemTemplate是MenuItem内部使用了一个MenuItem作为项目容器的模板。这导致了MenuIteminside a MenuItemwhere theCommand和 the CommandPropertywhere 位于内部MenuItem，而 Style 位于外部MenuItem。这导致了我的问题，Command因为外部MenuItem已经消耗了Click.

现在，使用ItemContainerStylesetter 可以正确应用，MenuItem而使用BasedOn属性则可以获取全局样式的所有 Setter MenuItem。