TreeView: [iOS] Wrong visualization with custom ItemTemplate

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Completed

Last Updated: 23 Sep 2019 18:31 by ADMIN

Release R3 2019

Martin

Created on: 28 Aug 2019 09:53

Category: TreeView

Type: Bug Report

TreeView: [iOS] Wrong visualization with custom ItemTemplate

When the custom ItemTemplate sets bigger value of its Height e.g. more than 44 pixels, the content of the UITreeViewCell is not sized correctly. Only the cell gets the correct value.

4 comments

ADMIN

Lance | Senior Manager Technical Support

Posted on: 23 Sep 2019 18:30

Hello Martin,

For new issues, even if related to initial problem, please open a separate ticket. This allows both of us to investigate and track the problem independently of the original issue. This might seem inconvenient at first, but in our experience it almost always results in a faster time to solution and less confusion from nesting topics.

For your convenience, I have created the ticket for you and moved over your comments. The new ticket ID is 1430938 (direct link). If you have any additional comments or questions, please post a reply there so the developers have all the relevant information.

Thank you for your understanding and patience.

Regards,
Lance | Technical Support Engineer, Principal
Progress Telerik

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Martin

Posted on: 23 Sep 2019 13:50

Thank you for fixing this issue in v2019.3.913.1. Treeview items higher than 44 pixels are displayed correctly now on iOS. But scrolling still seems to be messed up. We are using different TreeViewDescriptors according to the type or hierarchy of the item in the databound ItemsSource. And each descriptor has a different ItemTemplate. There is one ItemTemplate which has a height of 150 pixels to display an image. When it's parent (height 60 pixels) is expanded and you scoll down, the child items jump around and are mixed up at the ui. To see this problem keep pulling from down to up when the scrolling has reached it's end. If you continue scrolling down and up, treeitem selection gets messed up too. You then can't selected any treeitem anymore (only by luck) and an items expander won't react anymore.

Is it comprehensible?

Does the scrolling issue have to do with ui virtualization according to RadDataGrid?
https://feedback.telerik.com/xamarin/1366379-datagrid-columnheaders-are-inaccurately-visualized-when-headercontenttemplate-is-set-and-horizontal-scrolling-is-performed

(On Android there are no scrollings issues.)

Thank you,

best regards

Martin

ADMIN

Didi

Posted on: 03 Sep 2019 08:25

Hi Trevor,

You can find the private build sent to a support ticket with id: 1427851.

Regards,
Didi
Progress Telerik

n/a

Posted on: 03 Sep 2019 05:16

Hi,

We're experiencing this issue in the latest version.
Can you please email a link for the private build that fixes this.

Thanks