问题
I'm trying to create a ListView
with grouping where the elements in each group are shown horizontally (as a scrollable content). No matter what I tried with the GroupStyle.Panel
of the ListView
it doesn't seem to have any effect on the list.
Here is how my XAML looks:
<ListView x:Name="itemListView"
Padding="10"
SelectionMode="None"
IsSwipeEnabled="False"
IsItemClickEnabled="True"
ItemTemplate="{StaticResource listItemTemplate}">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.Panel>
<ItemsPanelTemplate>
<ItemsWrapGrid ItemWidth="144" Orientation="Horizontal" />
</ItemsPanelTemplate>
</GroupStyle.Panel>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding DisplayTitle}"
Margin="0,10,0,5"
Foreground="Black"
Style="{StaticResource SubheaderTextBlockStyle}"
TextWrapping="NoWrap" />
</Grid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
Where
<Page.Resources>
<DataTemplate x:Key="listItemTemplate">
<Grid Width="144" Margin="5">
<!-- details -->
</Grid>
</DataTemplate>
</Page.Resources>
The following image shows on the left the actual result I get, and on the right what I want to have.
I tried using a ItemsWrapGrid
with different properties, I tried a StackPanel
and even an VariableSizedWrapGrid
, but nothing changed in the way the list items are displayed.
How can this be done?
回答1:
@kubakista was right about
It looks like if ListView.ItemsPanel contains ItemsStackPanel then GroupStyle.Panel is ignored...
However, changing this won't solve your problem as -
- The scrolling becomes a bit laggy.
- There is no horizontal scrolling.
- The
ListView
loses virtualization. - The nice group header rolling up animation is gone.
Here is an alternative without changing the structure of the ListView
itself but a little bit modification in your data structure.
The idea is, treat each horizontal list of rectangles under a group as one collection item on the UI.
This means, each group in the ListView
will only have one child, which is actually a collection of rectangles that will be presented in an horizontal scrollable ItemsControl
.
So, assume you have some collection of type ObservableCollection<Item>
as the CollectionViewSource
, the Item
will now become type of <ObservableCollection<Item>>
in order to hold the collection of rectangles. Therefore, the type of the collection will need to be updated to something like ObservableCollection<ObservableCollection<Item>>
.
Inside the ListView
's ItemTemplate
, you will need to create a horizontally scrolling ScrollViewer
and put an ItemsControl
inside. Make sure you have set the latter's ItemsSource
to {Binding}
.
To enable horizontal swiping, you will need to disable the tilt effect by editing the default style of ListViewItem
and commenting out the following code.
<!--
<VisualStateGroup.Transitions>
<VisualTransition From="Pressed" To="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="TiltContainer"/>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="Pressed">
<Storyboard>
<PointerDownThemeAnimation Storyboard.TargetName="TiltContainer"/>
</Storyboard>
</VisualState>
-->
I have attached a working sample project here as well as a screenshot shown below.
Hope this helps!
来源:https://stackoverflow.com/questions/27611135/setting-the-groupstyle-panel-of-a-listview-on-windows-phone