分组ListView WPF [英] Grouping ListView WPF
问题描述
令人沮丧.我做了一个Testapplication，看起来像这样:
It's frustrating. I had made a Testapplication, which look like this:
查看:
<Window.Resources>
<CollectionViewSource x:Key="GroupedItems" Source="{Binding Viewers}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="Sort" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Window.Resources>
<Grid>
<ListView
Width="244"
Height="184"
Margin="46,85,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
ItemsSource="{Binding Source={StaticResource GroupedItems}}">
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<StackPanel Orientation="Horizontal">
<TextBlock
Margin="10,0,0,0"
VerticalAlignment="Center"
FontWeight="Bold"
Text="{Binding Path=Name}" />
</StackPanel>
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander
BorderThickness="0"
DataContext="{Binding Items}"
IsExpanded="True">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock
VerticalAlignment="Top"
FontSize="22"
FontWeight="Bold"
Foreground="Gray"
Text="{Binding Sort}" />
</StackPanel>
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
ViewModel:
ViewModel:
public class MainWindowViewModel {
public ObservableCollection<MainWindowModel.Viewer> Viewers { get; set; }
public MainWindowViewModel() {
Viewers = new ObservableCollection<MainWindowModel.Viewer> {
new MainWindowModel.Viewer {
Name = "Hans",
Sort = MainWindowModel.SortDir.Admin
},
new MainWindowModel.Viewer {
Name = "Peter",
Sort = MainWindowModel.SortDir.Mod
},
new MainWindowModel.Viewer {
Name = "Frank",
Sort = MainWindowModel.SortDir.Admin
},
new MainWindowModel.Viewer {
Name = "Bilbo",
Sort = MainWindowModel.SortDir.Admin
},
};
}
}
型号:
public class MainWindowModel {
public class Viewer {
public string Name { get; set; }
public SortDir Sort { get; set; }
}
public enum SortDir {
Admin,
Mod,
}
}
是的，一切正常.我得到了预期的结果.
Yeah, everything works. I get the expected result.
因此，现在我想将此功能"(分组的列表视图)移植到我的真实"应用程序中，但是我无法使其与分组一起使用.有关更多详细信息，请查看我的视图:
So, now I want to port this "feature" (grouped listview) to my 'real' application, but I dont get it to work with grouping. For more details, my View:
<controls:MetroContentControl.Resources>
<CollectionViewSource x:Key="GroupedItems" Source="{Binding ChatHandler.Viewers}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="Type" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</controls:MetroContentControl.Resources>
......
<ListView
Name="lvUsers"
Grid.Column="1"
ItemsSource="{Binding Source={StaticResource GroupedItems}}">
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<StackPanel Orientation="Horizontal">
<Rectangle
Name="Mod"
Width="24"
Height="24"
Fill="Black">
<Rectangle.OpacityMask>
<VisualBrush Stretch="Fill" Visual="{StaticResource appbar_crown}" />
</Rectangle.OpacityMask>
<Rectangle.Style>
<Style TargetType="Rectangle">
<Setter Property="Visibility" Value="Hidden" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsMod, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</Rectangle.Style>
</Rectangle>
<Rectangle
Name="Sub"
Width="24"
Height="24"
Fill="Black">
<Rectangle.OpacityMask>
<VisualBrush Stretch="Fill" Visual="{StaticResource appbar_heart}" />
</Rectangle.OpacityMask>
<Rectangle.Style>
<Style TargetType="Rectangle">
<Setter Property="Visibility" Value="Hidden" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsSub}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</Rectangle.Style>
</Rectangle>
<TextBlock
Margin="10,0,0,0"
VerticalAlignment="Center"
FontWeight="Bold"
Text="{Binding Path=Name}" />
</StackPanel>
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander
Background="Transparent"
BorderThickness="0"
DataContext="{Binding Items}"
Foreground="Transparent"
IsExpanded="True">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock
VerticalAlignment="Top"
FontSize="22"
FontWeight="Bold"
Foreground="Gray"
Text="{Binding Type}" />
</StackPanel>
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ListView.GroupStyle>
<ListView.ContextMenu>
<ContextMenu Name="ViewerContextMenu">
<MenuItem Command="{Binding MuteCommand}" Header="Mute Viewer" />
<MenuItem Command="{Binding UnmuteCommand}" Header="Unmute Viewer" />
<MenuItem Command="{Binding ModCommand}" Header="Mod Viewer" />
<MenuItem Command="{Binding UnmodCommand}" Header="Unmod Viewer" />
<MenuItem Command="{Binding ShowUserInfo}" Header="User Information" />
</ContextMenu>
</ListView.ContextMenu>
</ListView>
型号:
[PropertyChanged.ImplementPropertyChanged]
public class Viewers {
public bool IsMod { get; set; }
public bool IsSub { get; set; }
public string Name { get; set; }
public string TwitchID { get; set; }
public SortDirectionListView Type { get; set; }
}
public enum SortDirectionListView {
Admin,
Mod,
Subscriber,
Follower,
Viewer
}
我的ViewModel仅包含与查看者一起的集合.
My ViewModel just contains the collection with the viewers.
public ObservableCollection<Models.Chat.Viewers> Viewers { get; set; }
现在我的问题是:在调试器中，我可以看到两个查看器，并且都具有不同的类型":
Now my problem: In the debugger I can see two viewers and both have diffrent "Types":
但是两者都显示为"Mod".不作为查看者:
But both shows up as "Mod". Not as a Viewer:
我没有看到我的测试应用程序和真实应用程序之间的任何区别，我也不知道第一个为什么运行，但是第二个为什么不运行.
I don't see any difference between my test application and my real application and I don't know why the first one works, but not the second one.
也许我错过了什么?感谢您的阅读！
Maybe I missed something? Thanks for reading!
推荐答案
我终于找到了解决我问题的方法.问题:在我的示例中，我在列表视图为绘制"之前添加了项目.
I have finally found a solution for my problem. The problem: In my example i add the items before the listview will be 'draw'.
在我的实际应用中，用户只会从事件添加到列表中.所以我必须告诉我的应用程序，我想刷新我的列表视图.
In my real application the users will only add to the list from an event. So i have to tell my application, that i want to refresh my listview.
然后我们去添加到CollectionViewSource"LiveGroupingProperties".
And there we go, i add to the CollectionViewSource "LiveGroupingProperties".
<CollectionViewSource
x:Key="cvsViewers"
IsLiveGroupingRequested="True"
Source="{Binding ChatHandler.Viewers}">
<CollectionViewSource.LiveGroupingProperties>
<clr:String>Type</clr:String>
</CollectionViewSource.LiveGroupingProperties>
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="Type" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
这篇关于分组ListView WPF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！
