VirtualizingStackPanel 클래스
어셈블리: PresentationFramework(presentationframework.dll)
XML 네임스페이스: http://schemas.microsoft.com/winfx/2006/xaml/presentation
In this context, the word "virtualize" refers to a technique by which a subset of user interface (UI) elements are generated from a larger number of data items based on which items are visible on-screen. Generating a large number of user interface (UI) elements when only a few elements might be on the screen at a given time is intensive with regard to both memory and processor. Through functionality that VirtualizingPanel provides, VirtualizingStackPanel calculates the number of visible items and works with the ItemContainerGenerator from an ItemsControl (such as ListBox or ListView) to create user interface (UI) elements only for visible items.
Virtualization in a StackPanel only occurs when items are data-bound. In scenarios with items that are not data-bound, a VirtualizingStackPanel offers no performance advantage over a StackPanel.
VirtualizingStackPanel is the default items host for the ListBox element. By default, the IsVirtualizing property is set to true.
When IsVirtualizing is set to false, a VirtualizingStackPanel behaves the same as a normal StackPanel.
The following example shows how to bind to an XML data source and virtualize the data source within a ListBox element by using Extensible Application Markup Language (XAML). Notice that the IsVirtualizing attached property is explicitly set to true.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowTitle="VirtualizingStackPanel Sample" Height="150" VerticalAlignment="Top"> <Page.Resources> <XmlDataProvider x:Key="Leagues" Source="Leagues.xml" XPath="Leagues/League"/> <DataTemplate x:Key="NameDataStyle"> <TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="12" Foreground="Black"/> </DataTemplate> </Page.Resources> <Border HorizontalAlignment="Left" VerticalAlignment="Top" BorderBrush="Black" BorderThickness="2"> <ScrollViewer> <StackPanel DataContext="{Binding Source={StaticResource Leagues}}"> <TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="18" Foreground="Black"/> <ListBox VirtualizingStackPanel.IsVirtualizing="True" ItemsSource="{Binding XPath=Team}" ItemTemplate="{DynamicResource NameDataStyle}"/> </StackPanel> </ScrollViewer> </Border> </Page>
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