2
我無法使虛擬化在Popup
內的TreeView
上工作,而同一TreeView
完美工作在Popup
之外。Popup中的UI虛擬化
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ToggleButton IsChecked="{Binding ElementName=Popup, Path=IsOpen, Mode=TwoWay}"
Content="Test"/>
<TreeView Grid.Row="1" ItemsSource="{Binding Nodes}" VirtualizingPanel.IsVirtualizing="True">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Data}"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
<Popup x:Name="Popup" StaysOpen="True">
<TreeView ItemsSource="{Binding Nodes}" VirtualizingPanel.IsVirtualizing="True">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Data}"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Popup>
</Grid>
視圖模型和Node類
public class ViewModel
{
public ObservableCollection<Node> Nodes { get; private set; }
public ViewModel()
{
Nodes = new ObservableCollection<Node>();
Node parent = new Node("Parent");
for (int i = 0; i < 10000; i++)
parent.Children.Add(new Node(i.ToString()));
Nodes.Add(parent);
}
}
public class Node
{
public string Data { get; set; }
public List<Node> Children { get; set; }
public Node(string data)
{
Data = data;
Children = new List<Node>();
}
}
當我展開窗口裏面不花時間,同時擴大內彈出一個需要〜20多歲的樹父。
MS確認這是2010s中的一個錯誤,並建議使用ControlTemplate將ToggleButton和TreeView合併到一個控件中,但它對我沒有任何影響。