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Questions tagged [virtualizingstackpanel]

Arranges and virtualizes content on a single line that is oriented either horizontally or vertically.

The standard layout system creates item containers and computes layout for each item associated with a list control. 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 many UI elements when only a few elements might be on the screen can adversely affect the performance of your application. The VirtualizingStackPanel calculates the number of visible items and works with the ItemContainerGenerator from an ItemsControl (such as ListBox or ListView) to create UI elements only for visible items.

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Virtualizing Panel that doesn't crop items

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…
Josh G
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How can I increase the range of VirtualizingStackPanel in WP8?

This questions is mainly for Windows Phone devs, but I guess any XAML technology is applicable. My VirtualizingStackPanel works great and I can see the improvements in memory usage. However, the items I have in the ListBox are variable in height and…
Laith
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Virtualizing Stack Panel Returning Null Selected Item

I was using a stack panel to display listbox items, but when I decided to change it to a virtualizing one the selected item was null sometimes. Here is part of the DataTemplate I was using to invoke the selected item command: …
Robert
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VirtualizingStackPanel stops working when overriding the default control template for ScrollViewer

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…
Wallstreet Programmer
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What is the Disadvantage of VirtualizingStackPanel?

What is/are the main disadvantage of VirtualizingStackPanel? If it doesn't have any, then why it is not made as a default panel behavior/template in ItemsControl?
Prince Ashitaka
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VirtualizingStackPanel with Virtualized List

I am developing an application that is supposed to display a fairly large amount of items that are loaded from elsewhere (say, a database) in a list/grid-like thing. As having all the items in memory all the time seems like a waste, I am looking…
O. R. Mapper
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Using virtualization for WPF DataGrid inside ScrollViewer

I know that DataGrid supports virtualization, so it creates grid cells only for visible rows. However, this seems to work only if the DataGrid is constrained in size. In my scenario, a DataGrid is placed inside a scroll-viewer, like so…
user1211286
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VirtualizingStackPanel not handling collapsed items correctly

I am having a ListView in wpf which is used to display list of fields; based on a property value some of the fields can be collapsed at run time. Its working fine except that ListVIew does not collapse the space reserved for ListViewItem's which got…
akjoshi
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VirtualizingStackPanel on a Treeview ist not Virtualizing

I've got a problem here, I want to show some items in a TreeView, about 100.000 Elements. If i use the default WPF TreeView everything seems to work, but if i use a custom-TreeView (which is at the moment only an ItemsControl), virtualization…
opiswahn
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How does VirtualizingStackPanel decide when to unload (dispose?) of virtualized controls?

I'm working with an ItemsControl using a VirtualizingStackPanel in its ControlTemplate. I've got the virtualization working, to some extent. I've put debugging statements in the Loaded and Unloaded event handlers for the controls in my…
Alex Marshall
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adding a header to a listbox's scrollviewer and keeping the virtualizingStackPanel (wp7)

I want to add a header to my ListBoxes and I do this by using a template. The problem is that if I extend the ListBox's template it seems that the listbox's virtualizingstackpanel doesn't work anymore as expected: it loads all content before I can…
johnX99
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WPF Listview Virtualization mode gives issues while binding

I have created a new class (derived from listview). This listview is part of a view, which has a viewmodel. This viewmodel has two main properties - 1)myView(ICollectionView)...and isWritable(bool). Each listview item (row inside listview) has a…
Relativity
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Is it possible to override the ItemsPresenter to use a Virtualizing StackPanel instead of a regular stack panel?

Background I have a custom control that inherits from a TreeView and is modified to display in a data grid style. The problem I am seeing is with performance when expanding the tree. This is common from my research with Tree Views. Upon inspection…
tsells
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Rendering issues with items in ItemsControl

I'll keep it concise. I have a ListBox that implements an ItemTemplate. The DataTemplate contains a checkbox. I load about 2000 items. I check the first 5 items, scroll to the bottom and select the last 5 items. I then scroll up to the top item and…
Andres Olivares
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