GridLayoutManager.DefaultSpanSizeLookup
class GridLayoutManager.DefaultSpanSizeLookup : GridLayoutManager.SpanSizeLookup
| kotlin.Any | ||
| ↳ | androidx.recyclerview.widget.GridLayoutManager.SpanSizeLookup | |
| ↳ | androidx.recyclerview.widget.GridLayoutManager.DefaultSpanSizeLookup | |
Default implementation for SpanSizeLookup. Each item occupies 1 span.
Summary
Public constructors |
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Public functions |
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Int |
getSpanIndex(position: Int, spanCount: Int)Returns the final span index of the provided position. |
Int |
getSpanSize(position: Int)Returns the number of span occupied by the item at |
Inherited functions |
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Public constructors
Public functions
getSpanIndex
fun getSpanIndex(position: Int, spanCount: Int): Int
Returns the final span index of the provided position.
If getOrientation is VERTICAL, this is a column value. If getOrientation is HORIZONTAL, this is a row value.
If you have a faster way to calculate span index for your items, you should override this method. Otherwise, you should enable span index cache (setSpanIndexCacheEnabled) for better performance. When caching is disabled, default implementation traverses all items from 0 to position. When caching is enabled, it calculates from the closest cached value before the position.
If you override this method, you need to make sure it is consistent with getSpanSize. GridLayoutManager does not call this method for each item. It is called only for the reference item and rest of the items are assigned to spans based on the reference item. For example, you cannot assign a position to span 2 while span 1 is empty.
Note that span offsets always start with 0 and are not affected by RTL.
| Parameters | |
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position: Int |
The position of the item |
spanCount: Int |
The total number of spans in the grid |
| Returns | |
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Int |
The final span position of the item. Should be between 0 (inclusive) and |