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289 Sets whether to pin the header to the top or the footer to the bottom in the [list item group](ts-container-listitemgroup.md), if set. To support both the pin-to-top and pin-to-bottom features, set **sticky** to **StickyStyle.Header \| StickyStyle.Footer**.
301 | value | [StickyStyle](#stickystyle9) | Yes | Whether to pin the header to the top or the footer to the bottom in the list item group.<br>Default value: **StickyStyle.None**|
417 | value | [ChildrenMainSize](ts-container-scrollable-common.md#childrenmainsize12) | Yes | 1. Purpose:<br>By providing a **ChildrenMainSize** object to the **List** component, it accurately conveys the size information of all child components along the main axis. This enables the **List** component to maintain an accurate scroll position even when child components have varying sizes on the main axis, when child components are added or removed, or when [scrollToIndex](ts-container-scroll.md#scrolltoindex) is used. This ensures that [scrollTo](ts-container-scroll.md#scrollto) can jump to an exact specified location, [currentOffset](ts-container-scroll.md#currentoffset) can obtain the current exact scroll position, and the built-in scrollbar can move smoothly without any discontinuities.<br>2. Constraints:<br>(1) The provided size along the main axis must be consistent with the actual size of the child components on the main axis. Any changes in size or additions/removals of child components must be communicated to the **List** component through the **ChildrenMainSize** object method.<br>(2) When the child component is a list item group, the overall size of the list item group along the main axis must be accurately calculated based on the number of columns in the list item group, the spacing between list items along the main axis, and the size of the header, footer, and list items within the list item group. The calculated size must then be provided to the **List** component.<br>(3) If child components include list item groups, the **childrenMainSize** attribute must be set for each individual list item group. Each list item group, as well as the **List** component itself, must be bound one-to-one with a **ChildrenMainSize** object through the **childrenMainSize** attribute.<br>(4) For a multi-column list where child components are generated using **LazyForEach**, ensure that **LazyForEach** generates either all **ListItemGroup** components or all** ListItem** components. |
443 | None | 0 | In the **ListItemGroup** component, the header is not pinned to the top, and the footer is not pinned to the bottom.|
444 | Header | 1 | In the **ListItemGroup** component, the header is pinned to the top, and the footer is not pinned to the bottom. |
445 | Footer | 2 | In the **ListItemGroup** component, the footer is pinned to the bottom, and the header is not pinned to the top. |
783 Triggered when a child component enters or leaves the list display area. During index calculation, list item, header of the list item group, and footer of the list item group each are counted as a child component.
966 | NONE | 0 | The edge of the viewport is in the position of **none**. Applicable when the list item group does not contain any header, footer, or list item.|
969 | IN_FOOTER_AREA | 3 | The edge of the viewport is in the position of a footer.|