VirtualizedSectionList.js.bak
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/**
* 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 VirtualizedSectionList
* @flow
*/
'use strict';
const React = require('React');
const View = require('View');
const VirtualizedList = require('VirtualizedList');
const invariant = require('fbjs/lib/invariant');
import type {ViewToken} from 'ViewabilityHelper';
import type {Props as VirtualizedListProps} from 'VirtualizedList';
type Item = any;
type SectionItem = any;
type SectionBase = {
// Must be provided directly on each section.
data: Array<SectionItem>,
key?: string,
// Optional props will override list-wide props just for this section.
renderItem?: ?({
item: SectionItem,
index: number,
section: SectionBase,
separators: {
highlight: () => void,
unhighlight: () => void,
updateProps: (select: 'leading' | 'trailing', newProps: Object) => void,
},
}) => ?React.Element<*>,
ItemSeparatorComponent?: ?ReactClass<*>,
keyExtractor?: (item: SectionItem) => string,
// TODO: support more optional/override props
// FooterComponent?: ?ReactClass<*>,
// HeaderComponent?: ?ReactClass<*>,
// onViewableItemsChanged?: ({viewableItems: Array<ViewToken>, changed: Array<ViewToken>}) => void,
};
type RequiredProps<SectionT: SectionBase> = {
sections: Array<SectionT>,
};
type OptionalProps<SectionT: SectionBase> = {
/**
* Rendered after the last item in the last section.
*/
ListFooterComponent?: ?(ReactClass<*> | React.Element<*>),
/**
* Rendered at the very beginning of the list.
*/
ListHeaderComponent?: ?(ReactClass<*> | React.Element<*>),
/**
* Default renderer for every item in every section.
*/
renderItem: (info: {
item: Item,
index: number,
section: SectionT,
separators: {
highlight: () => void,
unhighlight: () => void,
updateProps: (select: 'leading' | 'trailing', newProps: Object) => void,
},
}) => ?React.Element<any>,
/**
* Rendered at the top of each section.
*/
renderSectionHeader?: ?({section: SectionT}) => ?React.Element<*>,
/**
* Rendered at the bottom of each section.
*/
renderSectionFooter?: ?({section: SectionT}) => ?React.Element<*>,
/**
* Rendered at the bottom of every Section, except the very last one, in place of the normal
* ItemSeparatorComponent.
*/
SectionSeparatorComponent?: ?ReactClass<*>,
/**
* Rendered at the bottom of every Item except the very last one in the last section.
*/
ItemSeparatorComponent?: ?ReactClass<*>,
/**
* Warning: Virtualization can drastically improve memory consumption for long lists, but trashes
* the state of items when they scroll out of the render window, so make sure all relavent data is
* stored outside of the recursive `renderItem` instance tree.
*/
enableVirtualization?: ?boolean,
keyExtractor: (item: Item, index: number) => string,
onEndReached?: ?({distanceFromEnd: number}) => void,
/**
* If provided, a standard RefreshControl will be added for "Pull to Refresh" functionality. Make
* sure to also set the `refreshing` prop correctly.
*/
onRefresh?: ?Function,
/**
* Called when the viewability of rows changes, as defined by the
* `viewabilityConfig` prop.
*/
onViewableItemsChanged?: ?({viewableItems: Array<ViewToken>, changed: Array<ViewToken>}) => void,
/**
* Set this true while waiting for new data from a refresh.
*/
refreshing?: ?boolean,
};
export type Props<SectionT> =
RequiredProps<SectionT> &
OptionalProps<SectionT> &
VirtualizedListProps;
type DefaultProps = (typeof VirtualizedList.defaultProps) & {data: Array<Item>};
type State = {childProps: VirtualizedListProps};
/**
* Right now this just flattens everything into one list and uses VirtualizedList under the
* hood. The only operation that might not scale well is concatting the data arrays of all the
* sections when new props are received, which should be plenty fast for up to ~10,000 items.
*/
class VirtualizedSectionList<SectionT: SectionBase>
extends React.PureComponent<DefaultProps, Props<SectionT>, State>
{
props: Props<SectionT>;
state: State;
setNativeProps(props: Object) {
if (this._listRef) {
this._listRef.setNativeProps(props);
}
}
static defaultProps: DefaultProps = {
...VirtualizedList.defaultProps,
data: [],
};
scrollToLocation(params: {
animated?: ?boolean, itemIndex: number, sectionIndex: number, viewPosition?: number
}) {
let index = params.itemIndex + 1;
for (let ii = 0; ii < params.sectionIndex; ii++) {
index += this.props.sections[ii].data.length + 1;
}
const toIndexParams = {
...params,
index,
};
this._listRef.scrollToIndex(toIndexParams);
}
getListRef(): VirtualizedList {
return this._listRef;
}
_keyExtractor = (item: Item, index: number) => {
const info = this._subExtractor(index);
return (info && info.key) || String(index);
};
_subExtractor(
index: number,
): ?{
section: SectionT,
key: string, // Key of the section or combined key for section + item
index: ?number, // Relative index within the section
leadingItem?: ?Item,
leadingSection?: ?SectionT,
trailingItem?: ?Item,
trailingSection?: ?SectionT,
} {
let itemIndex = index;
const defaultKeyExtractor = this.props.keyExtractor;
for (let ii = 0; ii < this.props.sections.length; ii++) {
const section = this.props.sections[ii];
const key = section.key || String(ii);
itemIndex -= 1; // The section itself is an item
if (itemIndex >= section.data.length) {
itemIndex -= section.data.length;
} else if (itemIndex === -1) {
return {section, key, index: null, trailingSection: this.props.sections[ii + 1]};
} else {
const keyExtractor = section.keyExtractor || defaultKeyExtractor;
return {
section,
key: key + ':' + keyExtractor(section.data[itemIndex], itemIndex),
index: itemIndex,
leadingItem: section.data[itemIndex - 1],
leadingSection: this.props.sections[ii - 1],
trailingItem: section.data[itemIndex + 1],
trailingSection: this.props.sections[ii + 1],
};
}
}
}
_convertViewable = (viewable: ViewToken): ?ViewToken => {
invariant(viewable.index != null, 'Received a broken ViewToken');
const info = this._subExtractor(viewable.index);
if (!info) {
return null;
}
const keyExtractor = info.section.keyExtractor || this.props.keyExtractor;
return {
...viewable,
index: info.index,
key: keyExtractor(viewable.item, info.index),
section: info.section,
};
};
_onViewableItemsChanged = (
{viewableItems, changed}: {viewableItems: Array<ViewToken>, changed: Array<ViewToken>}
) => {
if (this.props.onViewableItemsChanged) {
this.props.onViewableItemsChanged({
viewableItems: viewableItems.map(this._convertViewable, this).filter(Boolean),
changed: changed.map(this._convertViewable, this).filter(Boolean),
});
}
}
_renderItem = ({item, index}: {item: Item, index: number}) => {
const info = this._subExtractor(index);
if (!info) {
return null;
}
const infoIndex = info.index;
if (infoIndex == null) {
const {renderSectionHeader} = this.props;
return renderSectionHeader ? renderSectionHeader({section: info.section}) : null;
} else {
const renderItem = info.section.renderItem || this.props.renderItem;
const SeparatorComponent = this._getSeparatorComponent(index, info);
invariant(renderItem, 'no renderItem!');
return (
<ItemWithSeparator
SeparatorComponent={SeparatorComponent}
LeadingSeparatorComponent={infoIndex === 0
? this.props.SectionSeparatorComponent
: undefined
}
cellKey={info.key}
index={infoIndex}
item={item}
leadingItem={info.leadingItem}
leadingSection={info.leadingSection}
onUpdateSeparator={this._onUpdateSeparator}
prevCellKey={(this._subExtractor(index - 1) || {}).key}
ref={(ref) => {this._cellRefs[info.key] = ref;}}
renderItem={renderItem}
renderSectionFooter={infoIndex === info.section.data.length - 1
? this.props.renderSectionFooter
: undefined
}
section={info.section}
trailingItem={info.trailingItem}
trailingSection={info.trailingSection}
/>
);
}
};
_onUpdateSeparator = (key: string, newProps: Object) => {
const ref = this._cellRefs[key];
ref && ref.updateSeparatorProps(newProps);
};
_getSeparatorComponent(index: number, info?: ?Object): ?ReactClass<*> {
info = info || this._subExtractor(index);
if (!info) {
return null;
}
const ItemSeparatorComponent =
info.section.ItemSeparatorComponent || this.props.ItemSeparatorComponent;
const {SectionSeparatorComponent} = this.props;
const isLastItemInList = index === this.state.childProps.getItemCount() - 1;
const isLastItemInSection = info.index === info.section.data.length - 1;
if (SectionSeparatorComponent && isLastItemInSection) {
return SectionSeparatorComponent;
}
if (ItemSeparatorComponent && !isLastItemInSection && !isLastItemInList) {
return ItemSeparatorComponent;
}
return null;
}
_computeState(props: Props<SectionT>): State {
const offset = props.ListHeaderComponent ? 1 : 0;
const stickyHeaderIndices = [];
const itemCount = props.sections.reduce(
(v, section) => {
stickyHeaderIndices.push(v + offset);
return v + section.data.length + 1;
},
0
);
return {
childProps: {
...props,
renderItem: this._renderItem,
ItemSeparatorComponent: undefined, // Rendered with renderItem
data: props.sections,
getItemCount: () => itemCount,
getItem,
keyExtractor: this._keyExtractor,
onViewableItemsChanged:
props.onViewableItemsChanged ? this._onViewableItemsChanged : undefined,
stickyHeaderIndices: props.stickySectionHeadersEnabled ? stickyHeaderIndices : undefined,
},
};
}
constructor(props: Props<SectionT>, context: Object) {
super(props, context);
this.state = this._computeState(props);
}
componentWillReceiveProps(nextProps: Props<SectionT>) {
this.setState(this._computeState(nextProps));
}
render() {
return <VirtualizedList {...this.state.childProps} ref={this._captureRef} />;
}
_cellRefs = {};
_listRef: VirtualizedList;
_captureRef = (ref) => { this._listRef = ref; };
}
class ItemWithSeparator extends React.Component {
props: {
LeadingSeparatorComponent: ?ReactClass<*>,
SeparatorComponent: ?ReactClass<*>,
cellKey: string,
index: number,
item: Item,
onUpdateSeparator: (cellKey: string, newProps: Object) => void,
prevCellKey?: ?string,
renderItem: Function,
renderSectionFooter: ?Function,
section: Object,
leadingItem: ?Item,
leadingSection: ?Object,
trailingItem: ?Item,
trailingSection: ?Object,
};
state = {
separatorProps: {
highlighted: false,
leadingItem: this.props.item,
leadingSection: this.props.leadingSection,
section: this.props.section,
trailingItem: this.props.trailingItem,
trailingSection: this.props.trailingSection,
},
leadingSeparatorProps: {
highlighted: false,
leadingItem: this.props.leadingItem,
leadingSection: this.props.leadingSection,
section: this.props.section,
trailingItem: this.props.item,
trailingSection: this.props.trailingSection,
},
};
_separators = {
highlight: () => {
['leading', 'trailing'].forEach(s => this._separators.updateProps(s, {highlighted: true}));
},
unhighlight: () => {
['leading', 'trailing'].forEach(s => this._separators.updateProps(s, {highlighted: false}));
},
updateProps: (select: 'leading' | 'trailing', newProps: Object) => {
const {LeadingSeparatorComponent, cellKey, prevCellKey} = this.props;
if (select === 'leading' && LeadingSeparatorComponent) {
this.setState(state => ({
leadingSeparatorProps: {...state.leadingSeparatorProps, ...newProps}
}));
} else {
this.props.onUpdateSeparator((select === 'leading' && prevCellKey) || cellKey, newProps);
}
},
};
updateSeparatorProps(newProps: Object) {
this.setState(state => ({separatorProps: {...state.separatorProps, ...newProps}}));
}
render() {
const {LeadingSeparatorComponent, SeparatorComponent, item, index, section} = this.props;
const element = this.props.renderItem({
item,
index,
section,
separators: this._separators,
});
const leadingSeparator = LeadingSeparatorComponent &&
<LeadingSeparatorComponent {...this.state.leadingSeparatorProps} />;
const separator = SeparatorComponent && <SeparatorComponent {...this.state.separatorProps} />;
const footer = this.props.renderSectionFooter && this.props.renderSectionFooter({section});
return (leadingSeparator || separator || footer)
? <View>{leadingSeparator}{element}{separator}{footer}</View>
: element;
}
}
function getItem(sections: ?Array<Item>, index: number): ?Item {
if (!sections) {
return null;
}
let itemIdx = index - 1;
for (let ii = 0; ii < sections.length; ii++) {
if (itemIdx === -1) {
return sections[ii]; // The section itself is the item
} else if (itemIdx < sections[ii].data.length) {
return sections[ii].data[itemIdx];
} else {
itemIdx -= (sections[ii].data.length + 1);
}
}
return null;
}
module.exports = VirtualizedSectionList;