Feature request: LoopItemsPanel

[Vijay-Nirmal]

This control helps dev to easy achieve looping Items in ItemsControl.

<ListView>
    <ListView.ItemsPanel>
        <ItemsPanelTemplate>
            <controls:LoopItemsPanel/>
        </ItemsPanelTemplate>
    </ListView.ItemsPanel>
</ListView>

There is a Microsoft blog post to create this Panel.

I found a similar UserVoice

[mdtauk]

Is this not a Carousel that loops? Why not add a loop option to that control?

[Vijay-Nirmal]

@mdtauk Because looping Carousel will not cover all use cases of looping items. Ex: Carousel always has selected item at centre. In short, Carousel will not cover all the use case of ListViewBase(ListView, GridView, etc). Also, this panel can be easily reused in future controls like TrainView #1209, where it makes lot of sence to have looping items.

[mdtauk]

Hmm. From a design point of view, how do you indicate when a loop starts. A scrollbar indicator goes from one point to another. How does that work when there is no finite range? How does it work with mouse and keyboard control?

There is a lot to consider, and then finding use-cases that justify this kind of control needs to be collated. To see if it is worth the investment of time that would go into it, and to iron out the problems and issues related to it.

[Vijay-Nirmal]

@mdtauk I get this idea from Microsoft blog post. They have explained it with a sample code.

[michael-hawker]

I like the idea of generalizing this. I think the sticking point as @mdtauk mentioned is how the scrollbar behaves with each control.

[birbilis]

I would really like to be able to loop to the start of a long scrolling list (say on the phone) when I reach the bottom. Possibly with a customizable (and optional) visual end marker (horizontal, or vertical if list is horizontral, ruler) so that the looping occurrence is more obvious to the user. And I mean to add "Looping" bool property (defaulting probably to false if xaml-standard opts for compatibility over UX) to any List control that can scroll when it can't fit all its items in the view

[birbilis]

...and loop in the other way too, when I pull enough to overcome spring animation at the start of the list view, I'd like it to loop. Useful for lists that are sorted and long and you know you want to start browsing from the bottom without doing a resorting (or when multiple resorting UIs are too much to add - eg at data entry form fields)

[Mimetis]

I'm actually the author of the LoopItemsPanel, and the Carousel control.

I think (in my opinion) the question is :

1. Do we have to implement the loop mode in the Carousel (see Loop for Carousel #1462 )
2. Do we have to create instead an ItemsPanelTemplate to be able to customize any ItemsControl control
3. Both ?

[Vijay-Nirmal]

@Mimetis In my opinion "create an ItemsPanelTemplate to be able to customize any ItemsControl control" will have higher priority than "implement the loop mode in the Carousel". Devs can create looping Carousel with LoopItemsPanel but not vice versa. "Both" is good for devs.

[Mimetis]

The ItemsPanel Inside the Carousel is highly coupled with the control itself.
Actually, it's not possible to replace the Carousel's ItemsPanel with another one.
I already thought to change this behavior to have a carousel control without any dependencies with its items panel, but it's really complicated.
So for now, if you want a LoopItemsPanel to be able to use it in a Listbox or a ListView, you won't have it for the Carousel

[nmetulev]

@Mimetis, what about creating a LoopItemsPanel and extending the CarouselPanel from the LooptemsPanel to get the looping experience?