WPF ListBox的组面板 [英] Group panel of WPF ListBox

问题描述

我有一个列表框，该列表框使用GroupStyle对项目进行分组.我想在堆栈面板的底部添加一个包含所有组的控件.此附加控件必须是滚动内容的一部分，以便用户可以滚动到列表的底部以查看该控件.如果我使用的是没有组的列表框，则可以通过修改ListBox模板来轻松完成此任务.但是，将项目分组后，ListBox模板似乎仅适用于每个组.我可以修改GroupStyle.Panel，但这不允许我向该面板添加项目.

I have a listbox that is grouping the items with a GroupStyle. I would like add a control at the bottom of the stackpanel that holds all of the groups. This additional control needs to be part of the scrolling content so that the user would scroll to the bottom of the list to see the control. If I were using a listbox without the groups, this task would be easy by modifying the ListBox template. However, with the items grouped, the ListBox template seems to only apply on a per group basis. I can modify the GroupStyle.Panel, but that doesn't allow me to add items to that panel.

<ListBox>
<ListBox.ItemsPanel>
    <ItemsPanelTemplate>
        <WrapPanel/>
    </ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.GroupStyle>
    <GroupStyle>
         <GroupStyle.Panel>
             <ItemsPanelTemplate>
                 <VirtualizingStackPanel/>  **<----- I would like to add a control to this stackpanel**
             </ItemsPanelTemplate>
         </GroupStyle.Panel>
        <GroupStyle.ContainerStyle>
            <Style TargetType="{x:Type GroupItem}">
                <Setter Property="Template">
                     <Setter.Value>
                         <ControlTemplate TargetType="{x:Type GroupItem}">
                              <Grid>
                                  <ItemsPresenter />
                              </Grid>
                         </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </GroupStyle.ContainerStyle>
    </GroupStyle>
</ListBox.GroupStyle>

这应该让我知道我需要做什么:

This should give an idea of what I need to do:

推荐答案

您可以使用计划用于ListBox的策略，而只需使用GroupItem即可.如果将此XAML添加到GroupStyle，则会添加组结束TextBlock:

You can use the strategy you were planning on for a ListBox, just do it for a GroupItem instead. If you add this XAML to your GroupStyle, it will add an end-of-group TextBlock:

<GroupStyle.ContainerStyle>
    <Style TargetType="GroupItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type GroupItem}">
                    <StackPanel>
                        <ContentPresenter/>
                        <ItemsPresenter Margin="5,0,0,0"/>
                        <TextBlock Text="*** End of group ***"/>
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</GroupStyle.ContainerStyle>

这是一个完整的仅XAML的分组列表示例，其中带有滚动条，并且在滚动区域的末尾添加了其他内容:

Here is a complete XAML-only example of a grouped list with a scrollbar and additional content added to the end of the scrolling region:

<Grid Height="100">
    <Grid.Resources>
        <PointCollection x:Key="sampleData">
            <Point X="1" Y="1"/>
            <Point X="1" Y="2"/>
            <Point X="2" Y="3"/>
            <Point X="2" Y="4"/>
            <Point X="3" Y="5"/>
            <Point X="3" Y="6"/>
        </PointCollection>
        <CollectionViewSource x:Key="groupedSampleData" Source="{StaticResource sampleData}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="X" />
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
    </Grid.Resources>
    <ListBox ItemsSource="{Binding Source={StaticResource groupedSampleData}}">
        <ListBox.Template>
            <ControlTemplate TargetType="{x:Type ListBox}">
                <ScrollViewer CanContentScroll="True">
                    <StackPanel>
                        <ItemsPresenter/>
                        <TextBlock Text="*** End of list ***"/>
                    </StackPanel>
                </ScrollViewer>
            </ControlTemplate>
        </ListBox.Template>
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Path=Y}"/>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <WrapPanel/>
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
        <ItemsControl.GroupStyle>
            <GroupStyle>
                <GroupStyle.Panel>
                    <ItemsPanelTemplate>
                        <VirtualizingStackPanel/>
                    </ItemsPanelTemplate>
                </GroupStyle.Panel>
                <GroupStyle.HeaderTemplate>
                    <DataTemplate>
                        <TextBlock Margin="4" FontWeight="Bold" FontSize="15" Text="{Binding Path=Name}"/>
                    </DataTemplate>
                </GroupStyle.HeaderTemplate>
            </GroupStyle>
        </ItemsControl.GroupStyle>
    </ListBox>
</Grid>

这篇关于WPF ListBox的组面板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！