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Prevent scrolling grid when data is added

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GridView

This is a migrated thread and some comments may be shown as answers.

Anders Bergman asked on 09 Oct 2009, 10:29 AM

Consider the following scenario:

A grid populated with data, sorted and grouped by one column.

The row count is larger enough to enable scrollbars to be visible.

Data is added continuously to the grid. When added it is sorted in to the grouped list.

What we would like to achieve is that the current selected row(s) in the grid is “staying still” relative to the grid viewport when data is added to the grid.

We created a test project using Telerik WPF RadGridView, no specific settings in to the grid in XAML, and provided a mock datasource which added one row per second.

What happens is when data is added and sorted in “before” the selected row, the selected row is pushed down, out of the viewport.

Is it possible to have Telerik WPF RadGridView behave as mentioned above, the current visible rows stays put in the viewport even though rows are added above them in the grid?

4 Answers, 1 is accepted

answered on 13 Oct 2009, 08:51 AM

Thanks for your answer which brought new light to the issue.

Frozen rows are not what we are looking for.

BringDataItemIntoView does seem to take us halfway where we want to be. It has two problems as far as we can see:

It does bring the selectedItem (in our case) in to view, but as the method name implies, only in to view and not to a set position in the viewport. We would like for the selected row's vertical position in the viewport to be persisted even though new rows are added and sorted in above the current selected row.
It does not (as far as our tests goes), work when the grid has grouped columns.

Is there anyway to achieve what we want to do? If not possible now, is there any development being done that could resolve our problems, and in that case - is there a time frame for this that you can share?

Best regards and thanks for help!

answered on 16 Oct 2009, 06:41 AM

Hello Anders Bergman,

The only way I can think of is to call GridViewScrollViewer SetVerticalOffset method after you add new row. Unfortunately this method is not available in the current release but it will be with the Q3. We are thinking of adding public get property of type GridViewScrollViewer in GridViewDataControl (the base class of RadGridView).
As for the BringDataIntoView not working in grouped scenario - this is fixed in the latest internal build.

Let me know if this is acceptable for you.

Regards,
Hristo
the Telerik team

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