When using with react-native-reanimated, you can wrap CellContainer in Animated.createAnimatedComponent (this is similar to using Animated.View): height: Determines height of the element (present when list is horizontal).width: Determines width of the element (present when list is vertical).top: Determines position of the element on y axis.left: Determines position of the element on x axis.position: Value of this will be absolute as that's how FlashList positions elements.flexDirection: Depends on whether your list is horizontal or vertical.style: Style of CellContainer, including:.index: Index of the cell in the list, you can use this to query data if needed.onLayout: Method for updating data about the real CellContainer layout.The props contain the following properties: Ensure that the original props are passed to the returned CellContainer. The root component should always be a CellContainer which is also the default component used. Can be a React Component Class, or a render function. We recommend not ignoring that warning and defining estimatedItemSize before the list gets to your users.Įach cell is rendered using this element. If you don't specify this prop, you will get a warning with a value you can use. If you're confused between two values, the smaller value is a better choice. A quick look at Element Inspector can help you determine this. If most of the items are of different sizes, you can think of an average or median value and if most items are of the same size, just use that number. FlashList can then use this information to decide how many items it needs to draw on the screen before initial load and while scrolling. FlashList can appear slower while in dev mode due to a small render buffer.ĮstimatedItemSize is a single numeric value that hints FlashList about the approximate size of the items before they're rendered. Do not test performance with JS dev mode on.If your list has heterogenous views, pass their types to FlashList using getItemType prop to improve performance.Check your renderItem hierarchy for components that make use of useState and verify whether that state would need to be reset if a different item is passed to that component (see Recycling).Important: Scan your renderItem hierarchy for explicit key prop definitions and remove them. You should see a warning about missing estimatedItemSize and a suggestion. Switch from FlatList to FlashList and render the list once.To avoid common pitfalls, you can also follow these steps for migrating from FlatList, based on our own experiences:
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