class
BaseVirtualPanel
public abstract class BaseVirtualPanel : Panel Base class for virtualized, scrollable panels that only create item panels when visible.
Properties
| Name | Type | Description |
|---|---|---|
NeedsRebuild | Boolean | When true, forces a layout rebuild on the next Tick. |
Item | RenderFragment<Object> | Template used to render an item into a cell panel. |
OnCreateCell | Action<Panel, Object> | Called when a cell is created. Allows you to fill the cell in |
OnLastCell | Action | Called when the last cell has been viewed. This allows you to view more. |
Items | IEnumerable<Object> | Replaces the current items. Only triggers a rebuild if the sequence is actually different. When set to an IList (like List<T>), changes to the source list will be automatically detected. |
ItemCount | Int32 | Gets the number of items in the panel. |
Methods
Void AddItem(Object item) Adds a single item and marks the panel for rebuild.
item — The item to append. Void AddItems(IEnumerable<Object> items) Boolean RemoveItem(Object item) Removes the first occurrence of a specific item and marks the panel for rebuild.
item — The item to remove. returns — True if item was found and removed; otherwise false.
Void RemoveAt(Int32 index) Removes the item at the specified index and marks the panel for rebuild.
index — The zero-based index of the item to remove. Void InsertItem(Int32 index, Object item) Inserts an item at the specified index and marks the panel for rebuild.
index — The zero-based index at which item should be inserted. item — The item to insert. Void Clear() Clears all items and destroys created panels.
virtual Void Tick() Per-frame update: adjusts spacing from CSS, updates layout, creates/destroys visible panels.
Boolean HasData(Int32 i) Returns true if is a valid item index.
i — Item index. returns — True if within bounds; otherwise false.
Void SetItems(IEnumerable<Object> enumerable)