334 lines
12 KiB
JavaScript
334 lines
12 KiB
JavaScript
/**
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*
|
|
* @providesModule SectionList
|
|
* @flow
|
|
* @format
|
|
*/
|
|
'use strict';
|
|
|
|
const MetroListView = require('MetroListView');
|
|
const Platform = require('Platform');
|
|
const React = require('React');
|
|
const VirtualizedSectionList = require('VirtualizedSectionList');
|
|
|
|
import type {ViewToken} from 'ViewabilityHelper';
|
|
import type {Props as VirtualizedSectionListProps} from 'VirtualizedSectionList';
|
|
|
|
type Item = any;
|
|
|
|
type SectionBase<SectionItemT> = {
|
|
/**
|
|
* The data for rendering items in this section.
|
|
*/
|
|
data: $ReadOnlyArray<SectionItemT>,
|
|
/**
|
|
* Optional key to keep track of section re-ordering. If you don't plan on re-ordering sections,
|
|
* the array index will be used by default.
|
|
*/
|
|
key?: string,
|
|
|
|
// Optional props will override list-wide props just for this section.
|
|
renderItem?: ?(info: {
|
|
item: SectionItemT,
|
|
index: number,
|
|
section: SectionBase<SectionItemT>,
|
|
separators: {
|
|
highlight: () => void,
|
|
unhighlight: () => void,
|
|
updateProps: (select: 'leading' | 'trailing', newProps: Object) => void,
|
|
},
|
|
}) => ?React.Element<any>,
|
|
ItemSeparatorComponent?: ?ReactClass<any>,
|
|
keyExtractor?: (item: SectionItemT) => string,
|
|
|
|
// TODO: support more optional/override props
|
|
// onViewableItemsChanged?: ...
|
|
};
|
|
|
|
type RequiredProps<SectionT: SectionBase<any>> = {
|
|
/**
|
|
* The actual data to render, akin to the `data` prop in [`<FlatList>`](/react-native/docs/flatlist.html).
|
|
*
|
|
* General shape:
|
|
*
|
|
* sections: $ReadOnlyArray<{
|
|
* data: $ReadOnlyArray<SectionItem>,
|
|
* renderItem?: ({item: SectionItem, ...}) => ?React.Element<*>,
|
|
* ItemSeparatorComponent?: ?ReactClass<{highlighted: boolean, ...}>,
|
|
* }>
|
|
*/
|
|
sections: $ReadOnlyArray<SectionT>,
|
|
};
|
|
|
|
type OptionalProps<SectionT: SectionBase<any>> = {
|
|
/**
|
|
* Default renderer for every item in every section. Can be over-ridden on a per-section basis.
|
|
*/
|
|
renderItem: (info: {
|
|
item: Item,
|
|
index: number,
|
|
section: SectionT,
|
|
separators: {
|
|
highlight: () => void,
|
|
unhighlight: () => void,
|
|
updateProps: (select: 'leading' | 'trailing', newProps: Object) => void,
|
|
},
|
|
}) => ?React.Element<any>,
|
|
/**
|
|
* Rendered in between each item, but not at the top or bottom. By default, `highlighted`,
|
|
* `section`, and `[leading/trailing][Item/Separator]` props are provided. `renderItem` provides
|
|
* `separators.highlight`/`unhighlight` which will update the `highlighted` prop, but you can also
|
|
* add custom props with `separators.updateProps`.
|
|
*/
|
|
ItemSeparatorComponent?: ?ReactClass<any>,
|
|
/**
|
|
* Rendered at the very beginning of the list. Can be a React Component Class, a render function, or
|
|
* a rendered element.
|
|
*/
|
|
ListHeaderComponent?: ?(ReactClass<any> | React.Element<any>),
|
|
/**
|
|
* Rendered when the list is empty. Can be a React Component Class, a render function, or
|
|
* a rendered element.
|
|
*/
|
|
ListEmptyComponent?: ?(ReactClass<any> | React.Element<any>),
|
|
/**
|
|
* Rendered at the very end of the list. Can be a React Component Class, a render function, or
|
|
* a rendered element.
|
|
*/
|
|
ListFooterComponent?: ?(ReactClass<any> | React.Element<any>),
|
|
/**
|
|
* Rendered at the top and bottom of each section (note this is different from
|
|
* `ItemSeparatorComponent` which is only rendered between items). These are intended to separate
|
|
* sections from the headers above and below and typically have the same highlight response as
|
|
* `ItemSeparatorComponent`. Also receives `highlighted`, `[leading/trailing][Item/Separator]`,
|
|
* and any custom props from `separators.updateProps`.
|
|
*/
|
|
SectionSeparatorComponent?: ?ReactClass<any>,
|
|
/**
|
|
* A marker property for telling the list to re-render (since it implements `PureComponent`). If
|
|
* any of your `renderItem`, Header, Footer, etc. functions depend on anything outside of the
|
|
* `data` prop, stick it here and treat it immutably.
|
|
*/
|
|
extraData?: any,
|
|
/**
|
|
* How many items to render in the initial batch. This should be enough to fill the screen but not
|
|
* much more. Note these items will never be unmounted as part of the windowed rendering in order
|
|
* to improve perceived performance of scroll-to-top actions.
|
|
*/
|
|
initialNumToRender: number,
|
|
/**
|
|
* Reverses the direction of scroll. Uses scale transforms of -1.
|
|
*/
|
|
inverted?: ?boolean,
|
|
/**
|
|
* Used to extract a unique key for a given item at the specified index. Key is used for caching
|
|
* and as the react key to track item re-ordering. The default extractor checks item.key, then
|
|
* falls back to using the index, like react does. Note that this sets keys for each item, but
|
|
* each overall section still needs its own key.
|
|
*/
|
|
keyExtractor: (item: Item, index: number) => string,
|
|
/**
|
|
* Called once when the scroll position gets within `onEndReachedThreshold` of the rendered
|
|
* content.
|
|
*/
|
|
onEndReached?: ?(info: {distanceFromEnd: number}) => void,
|
|
/**
|
|
* How far from the end (in units of visible length of the list) the bottom edge of the
|
|
* list must be from the end of the content to trigger the `onEndReached` callback.
|
|
* Thus a value of 0.5 will trigger `onEndReached` when the end of the content is
|
|
* within half the visible length of the list.
|
|
*/
|
|
onEndReachedThreshold?: ?number,
|
|
/**
|
|
* If provided, a standard RefreshControl will be added for "Pull to Refresh" functionality. Make
|
|
* sure to also set the `refreshing` prop correctly.
|
|
*/
|
|
onRefresh?: ?() => void,
|
|
/**
|
|
* Called when the viewability of rows changes, as defined by the
|
|
* `viewabilityConfig` prop.
|
|
*/
|
|
onViewableItemsChanged?: ?(info: {
|
|
viewableItems: Array<ViewToken>,
|
|
changed: Array<ViewToken>,
|
|
}) => void,
|
|
/**
|
|
* Set this true while waiting for new data from a refresh.
|
|
*/
|
|
refreshing?: ?boolean,
|
|
/**
|
|
* Note: may have bugs (missing content) in some circumstances - use at your own risk.
|
|
*
|
|
* This may improve scroll performance for large lists.
|
|
*/
|
|
removeClippedSubviews?: boolean,
|
|
/**
|
|
* Rendered at the top of each section. These stick to the top of the `ScrollView` by default on
|
|
* iOS. See `stickySectionHeadersEnabled`.
|
|
*/
|
|
renderSectionHeader?: ?(info: {section: SectionT}) => ?React.Element<any>,
|
|
/**
|
|
* Rendered at the bottom of each section.
|
|
*/
|
|
renderSectionFooter?: ?(info: {section: SectionT}) => ?React.Element<any>,
|
|
/**
|
|
* Makes section headers stick to the top of the screen until the next one pushes it off. Only
|
|
* enabled by default on iOS because that is the platform standard there.
|
|
*/
|
|
stickySectionHeadersEnabled?: boolean,
|
|
|
|
legacyImplementation?: ?boolean,
|
|
};
|
|
|
|
type Props<SectionT> = RequiredProps<SectionT> &
|
|
OptionalProps<SectionT> &
|
|
VirtualizedSectionListProps<SectionT>;
|
|
|
|
const defaultProps = {
|
|
...VirtualizedSectionList.defaultProps,
|
|
stickySectionHeadersEnabled: Platform.OS === 'ios',
|
|
};
|
|
|
|
type DefaultProps = typeof defaultProps;
|
|
|
|
/**
|
|
* A performant interface for rendering sectioned lists, supporting the most handy features:
|
|
*
|
|
* - Fully cross-platform.
|
|
* - Configurable viewability callbacks.
|
|
* - List header support.
|
|
* - List footer support.
|
|
* - Item separator support.
|
|
* - Section header support.
|
|
* - Section separator support.
|
|
* - Heterogeneous data and item rendering support.
|
|
* - Pull to Refresh.
|
|
* - Scroll loading.
|
|
*
|
|
* If you don't need section support and want a simpler interface, use
|
|
* [`<FlatList>`](/react-native/docs/flatlist.html).
|
|
*
|
|
* Simple Examples:
|
|
*
|
|
* <SectionList
|
|
* renderItem={({item}) => <ListItem title={item} />}
|
|
* renderSectionHeader={({section}) => <Header title={section.title} />}
|
|
* sections={[ // homogenous rendering between sections
|
|
* {data: [...], title: ...},
|
|
* {data: [...], title: ...},
|
|
* {data: [...], title: ...},
|
|
* ]}
|
|
* />
|
|
*
|
|
* <SectionList
|
|
* sections={[ // heterogeneous rendering between sections
|
|
* {data: [...], renderItem: ...},
|
|
* {data: [...], renderItem: ...},
|
|
* {data: [...], renderItem: ...},
|
|
* ]}
|
|
* />
|
|
*
|
|
* This is a convenience wrapper around [`<VirtualizedList>`](docs/virtualizedlist.html),
|
|
* and thus inherits its props (as well as those of `ScrollView`) that aren't explicitly listed
|
|
* here, along with the following caveats:
|
|
*
|
|
* - Internal state is not preserved when content scrolls out of the render window. Make sure all
|
|
* your data is captured in the item data or external stores like Flux, Redux, or Relay.
|
|
* - This is a `PureComponent` which means that it will not re-render if `props` remain shallow-
|
|
* equal. Make sure that everything your `renderItem` function depends on is passed as a prop
|
|
* (e.g. `extraData`) that is not `===` after updates, otherwise your UI may not update on
|
|
* changes. This includes the `data` prop and parent component state.
|
|
* - In order to constrain memory and enable smooth scrolling, content is rendered asynchronously
|
|
* offscreen. This means it's possible to scroll faster than the fill rate and momentarily see
|
|
* blank content. This is a tradeoff that can be adjusted to suit the needs of each application,
|
|
* and we are working on improving it behind the scenes.
|
|
* - By default, the list looks for a `key` prop on each item and uses that for the React key.
|
|
* Alternatively, you can provide a custom `keyExtractor` prop.
|
|
*
|
|
*/
|
|
class SectionList<SectionT: SectionBase<any>> extends React.PureComponent<
|
|
DefaultProps,
|
|
Props<SectionT>,
|
|
void,
|
|
> {
|
|
props: Props<SectionT>;
|
|
static defaultProps: DefaultProps = defaultProps;
|
|
|
|
/**
|
|
* Scrolls to the item at the specified `sectionIndex` and `itemIndex` (within the section)
|
|
* positioned in the viewable area such that `viewPosition` 0 places it at the top (and may be
|
|
* covered by a sticky header), 1 at the bottom, and 0.5 centered in the middle. `viewOffset` is a
|
|
* fixed number of pixels to offset the final target position, e.g. to compensate for sticky
|
|
* headers.
|
|
*
|
|
* Note: cannot scroll to locations outside the render window without specifying the
|
|
* `getItemLayout` prop.
|
|
*/
|
|
scrollToLocation(params: {
|
|
animated?: ?boolean,
|
|
itemIndex: number,
|
|
sectionIndex: number,
|
|
viewOffset?: number,
|
|
viewPosition?: number,
|
|
}) {
|
|
this._wrapperListRef.scrollToLocation(params);
|
|
}
|
|
|
|
/**
|
|
* Tells the list an interaction has occured, which should trigger viewability calculations, e.g.
|
|
* if `waitForInteractions` is true and the user has not scrolled. This is typically called by
|
|
* taps on items or by navigation actions.
|
|
*/
|
|
recordInteraction() {
|
|
const listRef = this._wrapperListRef && this._wrapperListRef.getListRef();
|
|
listRef && listRef.recordInteraction();
|
|
}
|
|
|
|
/**
|
|
* Displays the scroll indicators momentarily.
|
|
*
|
|
* @platform ios
|
|
*/
|
|
flashScrollIndicators() {
|
|
const listRef = this._wrapperListRef && this._wrapperListRef.getListRef();
|
|
listRef && listRef.flashScrollIndicators();
|
|
}
|
|
|
|
/**
|
|
* Provides a handle to the underlying scroll responder.
|
|
*/
|
|
getScrollResponder() {
|
|
const listRef = this._wrapperListRef && this._wrapperListRef.getListRef();
|
|
if (listRef) {
|
|
return listRef.getScrollResponder();
|
|
}
|
|
}
|
|
|
|
getScrollableNode() {
|
|
const listRef = this._wrapperListRef && this._wrapperListRef.getListRef();
|
|
if (listRef) {
|
|
return listRef.getScrollableNode();
|
|
}
|
|
}
|
|
|
|
render() {
|
|
const List = this.props.legacyImplementation
|
|
? MetroListView
|
|
: VirtualizedSectionList;
|
|
return <List {...this.props} ref={this._captureRef} />;
|
|
}
|
|
|
|
_wrapperListRef: MetroListView | VirtualizedSectionList<any>;
|
|
_captureRef = ref => {
|
|
this._wrapperListRef = ref;
|
|
};
|
|
}
|
|
|
|
module.exports = SectionList;
|