[Question] Does the DataGrid have any inbuilt support to scroll when a target of Drag and Drop?

[omnilogix]

Does the DataGrid have any inbuilt support to scroll when a target of Drag and Drop? I suspect no. If yes, how? If not, is there any example code for how to achieve this? With the WPF datagrid I could get access the scrollviewer and there were other helpful methods like ScrollToIndex(), ScrollToTop(), etc. The ScrollIntoView(object) is not very useful since I do not know what rows are visible, and thus do not know what should scroll into the view next. A couple of methods ScrollToNext() and ScrollToPrevious() would be great.

[ghost]

Hello omnilogix, thank you for your interest in Windows Community Toolkit!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible.. Other community members may also answer the question and provide feedback 🙌

[Kyaa-dost]

Looping in @anawishnoff @RBrid ⬆️

[omnilogix]

@andrewleader - per your request at the standup. this is a good example of an unanswered question. It seem that someone from MS could just post a reply. Acknowledging that a post has been made is not helpful. Feedback is critical to keep community support active. Otherwise, why do we bother to post? I think I read MS has 163,000 employees, perhaps assigning one person per repo that does daily triage is not too much to ask?

[Kyaa-dost]

@omnilogix I am not certain what was your discussion with @andrewleader. There are different scenarios in different issues that cause extra time depending on the severity of the issue. In terms of WCT, our internal and external community members are active in regards to triaging and resolving the issue.

[omnilogix]

@omnilogix I am not certain what was your discussion with @andrewleader. In this scenario, since Windows Community Toolkit does not support Datagrid directly, we are asked to triage to the Datagrid team which is mentioned above. There are different scenarios in different issues that cause extra time depending on the severity of the issue. In terms of WCT, our internal and external community members are active in regards to triaging and resolving the issue.

@Kyaa-dost - I Appreciate the response, but seriously, it's been 18 days since the question was asked. A simple yes/no answer would have allow me to move forward from this question. If this was routed to the proper team, I'm sure an answer could have been produced in just minutes.

[andrewleader]

Thanks Kyaa - For context, omnilogix mentioned on our Project Reunion community call that there were several threads that didn't get responses for quite a while, so I asked omnilogix to ping me on those threads so I could help make sure they get answered.

@anawishnoff @RBrid can you answer this thread?

[RBrid]

There is no build-in feature for auto-scrolling during a drag/drop operation.

This was my first idea:

• Listen to the DataGrid’s LoadingRow and UnloadingRow events. The customer should be able to track the index range [n, m] of the data items being displayed at a given time.
• Track the distance T between the drag/drop item and the top edge of the rows area.
• Track the distance B between the drag/drop item and the bottom edge of the rows area.
• If T gets smaller than a threshold, start a recurring timer with an interval proportional to T.
• At each timer tick, call DataGrid.ScrollIntoView(object item, DataGridColumn column) with the data item n-1 until n==0 or T crosses the threshold at which point the timer is stopped.
• Same goes for B and m+1. …but after some testing it turns out that DataGrid.ScrollIntoView(object item, DataGridColumn column) only works on partially scrolled-off rows. You cannot scroll in data item #10 if none of it is visible and the first visible row is #11 ☹.

So the possible approaches to explore involve modifying the DataGrid code.

• Extend the DataGrid.ScrollIntoView(object item, DataGridColumn column) method so that it works on the data item prior to the first displayed item and following the last displayed item.
• Expose the vertical ScrollBar publicly (it’s currently internal ScrollBar VerticalScrollBar). That would let apps change its Value property during the timer’s tick event above.

Hope this helps. Thank you.

[Kyaa-dost]

Thanks, @RBrid for providing a detailed response. @omnilogix Thanks for showing your concern and hope that answered your question ⬆️ We are working with the community regularly to make certain that the community is enagaged and issues are resolved as soon as possible. We have recently established Discussion platform as well where you can collaboratively work with the community to look into questions/help or features.

Feel free to close this issue if your question was answered. Thanks!

[omnilogix]

@RBrid, @Kyaa-dost - Thanks for the possible solution. I have implemented something similar, but I am concerned that the implementation is brittle because some assumptions about state need to be made. Adding some ScrollTo_xxx helper methods would be a welcome addition to the control.

[Kyaa-dost]

@omnilogix In terms of any proposal or feature requests, you can submit the request here

[ghost]

Thanks omnilogix for patiently waiting while the team is still investigating the issue.

@anawishnoff @RBrid can we please have an update on this issue? Thanks

[ghost]

Thanks omnilogix for patiently waiting while the team is still investigating the issue.

@anawishnoff @RBrid can we please have an update on this issue? Thanks