virtualizingstackpanel

I have a listbox with a lot of items which are expensive to render. However the VirtualizingStackPanel takes care of that by only rendering the visible items. I want to override the control template for ScrollViewer since the default one has grey rectangle between the horizontal and vertical scrollbar. I just copied the one provided by Microsoft ( ScrollViewer ControlTemplate Example ) which do not have the grey rectangle issue. This controltemplate however disables virtualization by giving the VirtualizingStackPanel endless height. That means that the VirtualizingStackPanel will render all

I've started exploring the Data and UI virtualization features in WPF recently and stumbled upon something strange. I created a DataGrid 's with Virtualizing enabled and filled it with a list with 1,000,000 items. This works great and amazingly fast. <Grid> <DataGrid x:Name="employees" VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.IsContainerVirtualizable="True" VirtualizingPanel.VirtualizationMode="Recycling"/> </Grid> However, when I nested it under a StackPanel it loads for over a minute until I get OutOfMemoryException . I've set the same VirtualizingPanel properties on the

So, it looks really silly to have a chrome-less collection if the items are getting cut/cropped at the end of the scroll region. I want to create a virtualizing panel for collections (ItemsControl/ListBox) that only draws whole items, never pieces of items. For example: ______________ | | |______________| ______________ | | |______________| ______________ | | I don't want the 3rd partial container to be displayed unless there is room for the WHOLE item/container to be displayed. In the examples, the third item was cropped because of a lack of space. Any suggestions? Should I try to reinvent

What is actually happening in VirtualizingStackPanel.VirtualizationMode = Recycling/Standard.? Fredrik Hedblad When VirtualizationMode is set to Recycling , the VirtualizingStackPanel will reuse item containers instead of having to create a new one. If we start out with this ------------------------- | Container 1 | Data 1 | ------------------------- | Container 2 | Data 2 | ------------------------- | Container 3 | Data 3 | And scroll one position down, so Data 1 is scrolled out of view and Data 4 is scrolled into view then Recyling will take the item container for Data 1 and reuse it for

I have implemented a selection pattern similar to the one described in this post using a ViewModel to store the IsSelected value, and by binding the ListViewItem.IsSelected to the ViewModel IsSelected: <ListView.ItemContainerStyle> <Style TargetType="{x:Type ListViewItem}"> <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}"/> </Style> </ListView.ItemContainerStyle> It works in general, but I encounter a severe problem. By using the a VirtualizingStackPanel as the panel in the list view, only the visible ListViewItem are getting created. If I use "Ctrl+A" to select all