export interface GestureViewerProps<ItemT, LC> {
/**
* When you want to efficiently manage multiple `GestureViewer` instances, you can use the `id` prop to use multiple `GestureViewer` components.
* @remarks `GestureViewer` automatically removes instances from memory when components are unmounted, so no manual memory management is required.
* @defaultValue 'default'
*/
id?: string;
/**
* The data to display in the `GestureViewer`.
*/
data: ItemT[];
/**
* The index of the item to display in the `GestureViewer` when the component is mounted.
* @defaultValue 0
*/
initialIndex?: number;
/**
* A callback function that is called when the index of the item changes.
*/
onIndexChange?: (index: number) => void;
/**
* A callback function that is called when the `GestureViewer` is dismissed.
*/
onDismiss?: () => void;
/**
* A callback function that is called when the dismiss interaction starts.
* @remarks Useful to hide external UI (e.g., headers, buttons) while the dismiss gesture/animation is in progress.
*/
onDismissStart?: () => void;
/**
* A callback function that is called to render the item.
*/
renderItem: (item: ItemT, index: number) => React.ReactElement;
/**
* A callback function that is called to render the container.
* @remarks Useful for composing additional UI (e.g., close button, toolbars) around the viewer.
* The second argument provides control helpers such as `dismiss()` to close the viewer.
*
* @param children - The viewer content to be rendered inside your container.
* @param helpers - Control helpers for the viewer. Currently includes `dismiss()`.
* @returns A React element that wraps and renders the provided `children`.
*/
renderContainer?: (
children: React.ReactElement,
helpers: { dismiss: () => void },
) => React.ReactElement;
/**
* Support for any list component like `ScrollView`, `FlatList`, `FlashList` through the `ListComponent` prop.
*/
ListComponent: LC;
/**
* The width of the `GestureViewer`.
* @remarks If you don't set this prop, the width of the `GestureViewer` will be the same as the width of the screen.
* @defaultValue screen width
*/
width?: number;
/**
* The height of the `GestureViewer`.
* @remarks If you don't set this prop, the height of the `GestureViewer` will be the same as the height of the screen.
* @defaultValue screen height
*/
height?: number;
/**
* Auto play mode.
* @remarks
* - When `true`, the viewer will automatically play the next item after the specified interval.
* - When `enableLoop` is enabled, the viewer will loop back to the first item after the last item.
* - When `enableLoop` is disabled, the viewer will stop at the last item.
* - When there is only one item, auto-play is disabled.
* - When zoom or rotate gestures are detected, the auto-play will be paused.
* @defaultValue false
*/
autoPlay?: boolean;
/**
* Auto play interval.
* @remarks
* - When `autoPlay` is enabled, the viewer advances to the next item after the specified interval (ms).
* - Must be a positive integer. Values below 250ms are clamped to 250ms at runtime.
* @defaultValue 3000
*/
autoPlayInterval?: number;
/**
* Enables snap scrolling mode.
*
* @remarks
* **`false` (default)**: Paging mode (`pagingEnabled: true`)
* - Scrolls by full screen size increments
*
* **`true`**: Snap mode (`snapToInterval` auto-calculated)
* - `snapToInterval` is automatically calculated based on `width` and `itemSpacing` values
* - Use this option when you need item spacing
* @defaultValue false
*
*/
useSnap?: boolean;
/**
* `dismissThreshold` controls when `onDismiss` is called by applying a threshold value during vertical gestures.
* @defaultValue 80
*/
dismissThreshold?: number;
/**
* Calls `onDismiss` function when swiping down.
* @remarks Useful for closing modals with downward swipe gestures.
* @defaultValue true
*/
enableDismissGesture?: boolean;
/**
* Controls left/right swipe gestures.
* @remarks When `false`, horizontal gestures are disabled.
* @defaultValue true
*/
enableSwipeGesture?: boolean;
/**
* `resistance` controls the range of vertical movement by applying resistance during vertical gestures.
* @defaultValue 2
*/
resistance?: number;
/**
* The props to pass to the list component.
* @remarks The `listProps` provides **type inference based on the selected list component**, ensuring accurate autocompletion and type safety in your IDE.
*/
listProps?: Partial<ConditionalListProps<ItemT, LC>>;
/**
* The style of the backdrop.
*/
backdropStyle?: StyleProp<ViewStyle>;
/**
* The style of the container.
*/
containerStyle?: StyleProp<ViewStyle>;
/**
* By default, the background `opacity` gradually decreases from 1 to 0 during downward swipe gestures.
* @remarks When `false`, this animation is disabled.
* @defaultValue true
*/
animateBackdrop?: boolean;
/**
* Only works when zoom is active, allows moving item position when zoomed.
* @remarks When `false`, gesture movement is disabled during zoom.
* @defaultValue true
*/
enableZoomPanGesture?: boolean;
/**
* Controls two-finger pinch gestures.
* @remarks When `false`, two-finger zoom gestures are disabled.
* @defaultValue true
*/
enableZoomGesture?: boolean;
/**
* Controls double-tap zoom gestures.
* @remarks When `false`, double-tap zoom gestures are disabled.
* @defaultValue true
*/
enableDoubleTapGesture?: boolean;
/**
* Enables infinite loop navigation.
* @defaultValue false
*/
enableLoop?: boolean;
/**
* The maximum zoom scale.
* @defaultValue 2
*/
maxZoomScale?: number;
/**
* The spacing between items in pixels.
* @remarks Only applied when `useSnap` is `true`.
* @defaultValue 0
*/
itemSpacing?: number;
/**
* Trigger-based animation settings
* @remarks You can customize animation duration, easing, and system reduce-motion behavior.
*
* @example
* ```tsx
* <GestureViewer
* triggerAnimation={{
* duration: 250,
* easing: Easing.out(Easing.cubic),
* reduceMotion: 'system',
* onAnimationComplete: () => {
* console.log('Animation complete');
* },
* }}
* />
* ```
*/
triggerAnimation?: TriggerAnimationConfig;
}
