How can we have the vertical scrolling stop when you get to the bottom of the list? In the Xceed example apps when you get to the end of the list you can keep scrolling until you can only see one item in the grid! We would rather it not do that.

The other problem (related) is that when you call BringItemIntoView, in some cases, the grid only shows one item in the grid instead of showing as much data in the grid as possible. This makes it look to a common user that there is only one item in the grid and all their data went poof.

Thanks!

This is normal behavior due to virtualization. The only way to disable it would be to display virtualization by changing the grid's ItemPanel to a non-virtualizing one. For example:

<code>
<xcdg:DataGridControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel/>
</ItemsPanelTemplate>
</xcdg:DataGridControl.ItemsPanel>
</code>

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Technical Writer - Xceed Software

Of all the things I've lost, I miss my mind the most. - Mark Twain

Forgot to mention that if you disable virtualization and you have alot of data in the grid, you will encounter a performance hit.

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Technical Writer - Xceed Software

Of all the things I've lost, I miss my mind the most. - Mark Twain

Yeah, we want to keep the virtualizing panel. We've worked around the problem by handling ScrollChanged (which itself tricky because we have code that recreates the scroll view periodically). In ScrollChanged we can detect that BringItemIntoView has been called and has put the current item at the top, so we programmatically reset the scrollviewer's VerticalOffset to scroll down a bit to make it look better.

An alternative would be present, but only if you can live with fixed row height.

It's not an easy one, but you could create your own DataGridVirtualizingPanel that works with the assumption that Rows have a "fixed" height (therefore, layout is predictable). This assumption being present, you always know how many items fit in a "page"...

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Marc Laroche
Software Developer
Xceed Software Inc.

I don’t suffer from insanity, I enjoy every minute of it. - Unknown

"This assumption being present, you always know how many items fit in a "page"..."

But surely, if the grid knows it is at the last row (and you know how tall it is), you shouldn't need to scroll any further, and hence leave it at the bottom of the its parent container, rather than scrolling it to the top.

For example, scrolling by dragging the scrollbar works as expected, only clicking the downarrow or scrolling with mouse roller button scrolls the grid undesirably, hence I think it shouldn't really be too hard for the grid to be fixed?

 

Is this a MS 'by design' or an XCeed 'by design'?

We're really enjoying working with the pro grid, but it'd be much more professional if this can be worked around without turning off virtualization.

I put int he itemspaneltemplate, but I still got the odd scrolling behavior. I'm running the Pro version of Xceed 3.0, any suggestions?

The workaround that Marcus provided is just that: a workaround. Unfortunately, this is a shortcoming of the grid that we understand is annoying and may cause issues for some clients, but we are  working on it and will hopefully have a resolution in an upcoming release.

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Technical Writer - Xceed Software

Of all the things I've lost, I miss my mind the most. - Mark Twain

Unfourtantly this is a make it or break it feature. I have to have a grid that autoscrolls to the bottom in a smooth fashion as hundreds of new rows are fed in through an observable collection.

 The scrolling behavior seems to be a bug though. I have changed nothing in my code and one day during testing scrolling/populating to the bottom was smooth, at night it was clearing the screen of rows before poulating new rows of information that couldn't fit in the viewport, cuasing a weird clear/populating paging effect, then next day it was smooth again, and broken again this morning, with no code change.

I have created a ticket for this issue and a developer will look into it as soon as possible. Thank you for your patience.

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Technical Writer - Xceed Software

Of all the things I've lost, I miss my mind the most. - Mark Twain

Thanks jenny.