656 lines
24 KiB
JavaScript
656 lines
24 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* Facebook, Inc. ("Facebook") owns all right, title and interest, including
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* all intellectual property and other proprietary rights, in and to the React
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* Native CustomComponents software (the "Software"). Subject to your
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* compliance with these terms, you are hereby granted a non-exclusive,
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* worldwide, royalty-free copyright license to (1) use and copy the Software;
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* and (2) reproduce and distribute the Software as part of your own software
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* ("Your Software"). Facebook reserves all rights not expressly granted to
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* you in this license agreement.
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*
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* THE SOFTWARE AND DOCUMENTATION, IF ANY, ARE PROVIDED "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES (INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE) ARE DISCLAIMED.
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* IN NO EVENT SHALL FACEBOOK OR ITS AFFILIATES, OFFICERS, DIRECTORS OR
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* EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @providesModule ListView
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*/
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'use strict';
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var ListViewDataSource = require('ListViewDataSource');
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var React = require('React');
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var ReactNative = require('ReactNative');
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var RCTScrollViewManager = require('NativeModules').ScrollViewManager;
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var ScrollView = require('ScrollView');
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var ScrollResponder = require('ScrollResponder');
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var StaticRenderer = require('StaticRenderer');
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var TimerMixin = require('react-timer-mixin');
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var cloneReferencedElement = require('react-clone-referenced-element');
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var isEmpty = require('isEmpty');
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var merge = require('merge');
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var PropTypes = React.PropTypes;
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var DEFAULT_PAGE_SIZE = 1;
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var DEFAULT_INITIAL_ROWS = 10;
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var DEFAULT_SCROLL_RENDER_AHEAD = 1000;
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var DEFAULT_END_REACHED_THRESHOLD = 1000;
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var DEFAULT_SCROLL_CALLBACK_THROTTLE = 50;
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/**
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* ListView - A core component designed for efficient display of vertically
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* scrolling lists of changing data. The minimal API is to create a
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* `ListView.DataSource`, populate it with a simple array of data blobs, and
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* instantiate a `ListView` component with that data source and a `renderRow`
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* callback which takes a blob from the data array and returns a renderable
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* component.
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*
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* Minimal example:
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*
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* ```
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* getInitialState: function() {
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* var ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
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* return {
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* dataSource: ds.cloneWithRows(['row 1', 'row 2']),
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* };
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* },
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*
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* render: function() {
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* return (
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* <ListView
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* dataSource={this.state.dataSource}
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* renderRow={(rowData) => <Text>{rowData}</Text>}
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* />
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* );
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* },
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* ```
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*
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* ListView also supports more advanced features, including sections with sticky
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* section headers, header and footer support, callbacks on reaching the end of
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* the available data (`onEndReached`) and on the set of rows that are visible
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* in the device viewport change (`onChangeVisibleRows`), and several
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* performance optimizations.
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*
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* There are a few performance operations designed to make ListView scroll
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* smoothly while dynamically loading potentially very large (or conceptually
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* infinite) data sets:
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*
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* * Only re-render changed rows - the rowHasChanged function provided to the
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* data source tells the ListView if it needs to re-render a row because the
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* source data has changed - see ListViewDataSource for more details.
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*
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* * Rate-limited row rendering - By default, only one row is rendered per
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* event-loop (customizable with the `pageSize` prop). This breaks up the
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* work into smaller chunks to reduce the chance of dropping frames while
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* rendering rows.
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*/
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var ListView = React.createClass({
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mixins: [ScrollResponder.Mixin, TimerMixin],
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statics: {
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DataSource: ListViewDataSource,
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},
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/**
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* You must provide a renderRow function. If you omit any of the other render
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* functions, ListView will simply skip rendering them.
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*
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* - renderRow(rowData, sectionID, rowID, highlightRow);
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* - renderSectionHeader(sectionData, sectionID);
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*/
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propTypes: {
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...ScrollView.propTypes,
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dataSource: PropTypes.instanceOf(ListViewDataSource).isRequired,
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/**
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* (sectionID, rowID, adjacentRowHighlighted) => renderable
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*
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* If provided, a renderable component to be rendered as the separator
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* below each row but not the last row if there is a section header below.
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* Take a sectionID and rowID of the row above and whether its adjacent row
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* is highlighted.
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*/
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renderSeparator: PropTypes.func,
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/**
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* (rowData, sectionID, rowID, highlightRow) => renderable
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*
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* Takes a data entry from the data source and its ids and should return
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* a renderable component to be rendered as the row. By default the data
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* is exactly what was put into the data source, but it's also possible to
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* provide custom extractors. ListView can be notified when a row is
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* being highlighted by calling highlightRow function. The separators above and
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* below will be hidden when a row is highlighted. The highlighted state of
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* a row can be reset by calling highlightRow(null).
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*/
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renderRow: PropTypes.func.isRequired,
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/**
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* How many rows to render on initial component mount. Use this to make
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* it so that the first screen worth of data appears at one time instead of
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* over the course of multiple frames.
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*/
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initialListSize: PropTypes.number,
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/**
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* Called when all rows have been rendered and the list has been scrolled
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* to within onEndReachedThreshold of the bottom. The native scroll
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* event is provided.
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*/
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onEndReached: PropTypes.func,
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/**
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* Threshold in pixels (virtual, not physical) for calling onEndReached.
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*/
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onEndReachedThreshold: PropTypes.number,
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/**
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* Number of rows to render per event loop. Note: if your 'rows' are actually
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* cells, i.e. they don't span the full width of your view (as in the
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* ListViewGridLayoutExample), you should set the pageSize to be a multiple
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* of the number of cells per row, otherwise you're likely to see gaps at
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* the edge of the ListView as new pages are loaded.
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*/
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pageSize: PropTypes.number,
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/**
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* () => renderable
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*
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* The header and footer are always rendered (if these props are provided)
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* on every render pass. If they are expensive to re-render, wrap them
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* in StaticContainer or other mechanism as appropriate. Footer is always
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* at the bottom of the list, and header at the top, on every render pass.
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*/
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renderFooter: PropTypes.func,
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renderHeader: PropTypes.func,
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/**
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* (sectionData, sectionID) => renderable
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*
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* If provided, a sticky header is rendered for this section. The sticky
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* behavior means that it will scroll with the content at the top of the
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* section until it reaches the top of the screen, at which point it will
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* stick to the top until it is pushed off the screen by the next section
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* header.
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*/
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renderSectionHeader: PropTypes.func,
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/**
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* (props) => renderable
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*
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* A function that returns the scrollable component in which the list rows
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* are rendered. Defaults to returning a ScrollView with the given props.
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*/
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renderScrollComponent: React.PropTypes.func.isRequired,
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/**
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* How early to start rendering rows before they come on screen, in
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* pixels.
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*/
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scrollRenderAheadDistance: React.PropTypes.number,
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/**
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* (visibleRows, changedRows) => void
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*
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* Called when the set of visible rows changes. `visibleRows` maps
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* { sectionID: { rowID: true }} for all the visible rows, and
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* `changedRows` maps { sectionID: { rowID: true | false }} for the rows
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* that have changed their visibility, with true indicating visible, and
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* false indicating the view has moved out of view.
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*/
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onChangeVisibleRows: React.PropTypes.func,
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/**
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* A performance optimization for improving scroll perf of
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* large lists, used in conjunction with overflow: 'hidden' on the row
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* containers. This is enabled by default.
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*/
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removeClippedSubviews: React.PropTypes.bool,
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/**
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* An array of child indices determining which children get docked to the
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* top of the screen when scrolling. For example, passing
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* `stickyHeaderIndices={[0]}` will cause the first child to be fixed to the
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* top of the scroll view. This property is not supported in conjunction
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* with `horizontal={true}`.
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* @platform ios
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*/
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stickyHeaderIndices: PropTypes.arrayOf(PropTypes.number),
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/**
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* Flag indicating whether empty section headers should be rendered. In the future release
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* empty section headers will be rendered by default, and the flag will be deprecated.
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* If empty sections are not desired to be rendered their indices should be excluded from sectionID object.
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*/
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enableEmptySections: PropTypes.bool,
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},
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/**
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* Exports some data, e.g. for perf investigations or analytics.
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*/
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getMetrics: function() {
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return {
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contentLength: this.scrollProperties.contentLength,
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totalRows: (this.props.enableEmptySections ? this.props.dataSource.getRowAndSectionCount() : this.props.dataSource.getRowCount()),
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renderedRows: this.state.curRenderedRowsCount,
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visibleRows: Object.keys(this._visibleRows).length,
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};
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},
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/**
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* Provides a handle to the underlying scroll responder.
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* Note that `this._scrollComponent` might not be a `ScrollView`, so we
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* need to check that it responds to `getScrollResponder` before calling it.
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*/
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getScrollResponder: function() {
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if (this._scrollComponent && this._scrollComponent.getScrollResponder) {
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return this._scrollComponent.getScrollResponder();
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}
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},
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/**
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* Scrolls to a given x, y offset, either immediately or with a smooth animation.
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*
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* See `ScrollView#scrollTo`.
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*/
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scrollTo: function(...args) {
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if (this._scrollComponent && this._scrollComponent.scrollTo) {
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this._scrollComponent.scrollTo(...args);
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}
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},
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setNativeProps: function(props) {
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if (this._scrollComponent) {
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this._scrollComponent.setNativeProps(props);
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}
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},
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/**
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* React life cycle hooks.
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*/
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getDefaultProps: function() {
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return {
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initialListSize: DEFAULT_INITIAL_ROWS,
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pageSize: DEFAULT_PAGE_SIZE,
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renderScrollComponent: props => <ScrollView {...props} />,
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scrollRenderAheadDistance: DEFAULT_SCROLL_RENDER_AHEAD,
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onEndReachedThreshold: DEFAULT_END_REACHED_THRESHOLD,
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stickyHeaderIndices: [],
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};
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},
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getInitialState: function() {
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return {
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curRenderedRowsCount: this.props.initialListSize,
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highlightedRow: {},
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};
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},
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getInnerViewNode: function() {
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return this._scrollComponent.getInnerViewNode();
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},
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componentWillMount: function() {
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// this data should never trigger a render pass, so don't put in state
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this.scrollProperties = {
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visibleLength: null,
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contentLength: null,
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offset: 0
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};
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this._childFrames = [];
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this._visibleRows = {};
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this._prevRenderedRowsCount = 0;
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this._sentEndForContentLength = null;
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},
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componentDidMount: function() {
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// do this in animation frame until componentDidMount actually runs after
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// the component is laid out
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this.requestAnimationFrame(() => {
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this._measureAndUpdateScrollProps();
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});
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},
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componentWillReceiveProps: function(nextProps) {
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if (this.props.dataSource !== nextProps.dataSource ||
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this.props.initialListSize !== nextProps.initialListSize) {
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this.setState((state, props) => {
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this._prevRenderedRowsCount = 0;
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return {
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curRenderedRowsCount: Math.min(
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Math.max(
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state.curRenderedRowsCount,
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props.initialListSize
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),
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props.enableEmptySections ? props.dataSource.getRowAndSectionCount() : props.dataSource.getRowCount()
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),
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};
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}, () => this._renderMoreRowsIfNeeded());
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}
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},
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componentDidUpdate: function() {
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this.requestAnimationFrame(() => {
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this._measureAndUpdateScrollProps();
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});
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},
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_onRowHighlighted: function(sectionID, rowID) {
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this.setState({highlightedRow: {sectionID, rowID}});
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},
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render: function() {
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var bodyComponents = [];
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var dataSource = this.props.dataSource;
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var allRowIDs = dataSource.rowIdentities;
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var rowCount = 0;
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var sectionHeaderIndices = [];
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var header = this.props.renderHeader && this.props.renderHeader();
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var footer = this.props.renderFooter && this.props.renderFooter();
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var totalIndex = header ? 1 : 0;
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for (var sectionIdx = 0; sectionIdx < allRowIDs.length; sectionIdx++) {
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var sectionID = dataSource.sectionIdentities[sectionIdx];
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var rowIDs = allRowIDs[sectionIdx];
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if (rowIDs.length === 0) {
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if (this.props.enableEmptySections === undefined) {
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var warning = require('fbjs/lib/warning');
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warning(false, 'In next release empty section headers will be rendered.'
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+ ' In this release you can use \'enableEmptySections\' flag to render empty section headers.');
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continue;
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} else {
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var invariant = require('fbjs/lib/invariant');
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invariant(
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this.props.enableEmptySections,
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'In next release \'enableEmptySections\' flag will be deprecated, empty section headers will always be rendered.'
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+ ' If empty section headers are not desirable their indices should be excluded from sectionIDs object.'
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+ ' In this release \'enableEmptySections\' may only have value \'true\' to allow empty section headers rendering.');
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}
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}
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if (this.props.renderSectionHeader) {
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var shouldUpdateHeader = rowCount >= this._prevRenderedRowsCount &&
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dataSource.sectionHeaderShouldUpdate(sectionIdx);
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bodyComponents.push(
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<StaticRenderer
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key={'s_' + sectionID}
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shouldUpdate={!!shouldUpdateHeader}
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render={this.props.renderSectionHeader.bind(
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null,
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dataSource.getSectionHeaderData(sectionIdx),
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sectionID
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)}
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/>
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);
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sectionHeaderIndices.push(totalIndex++);
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}
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for (var rowIdx = 0; rowIdx < rowIDs.length; rowIdx++) {
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var rowID = rowIDs[rowIdx];
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var comboID = sectionID + '_' + rowID;
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var shouldUpdateRow = rowCount >= this._prevRenderedRowsCount &&
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dataSource.rowShouldUpdate(sectionIdx, rowIdx);
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var row =
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<StaticRenderer
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key={'r_' + comboID}
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shouldUpdate={!!shouldUpdateRow}
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render={this.props.renderRow.bind(
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null,
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dataSource.getRowData(sectionIdx, rowIdx),
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sectionID,
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rowID,
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this._onRowHighlighted
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)}
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/>;
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bodyComponents.push(row);
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totalIndex++;
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if (this.props.renderSeparator &&
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(rowIdx !== rowIDs.length - 1 || sectionIdx === allRowIDs.length - 1)) {
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var adjacentRowHighlighted =
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this.state.highlightedRow.sectionID === sectionID && (
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this.state.highlightedRow.rowID === rowID ||
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this.state.highlightedRow.rowID === rowIDs[rowIdx + 1]
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);
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var separator = this.props.renderSeparator(
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sectionID,
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rowID,
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adjacentRowHighlighted
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);
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if (separator) {
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bodyComponents.push(separator);
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totalIndex++;
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}
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}
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if (++rowCount === this.state.curRenderedRowsCount) {
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break;
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}
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}
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if (rowCount >= this.state.curRenderedRowsCount) {
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break;
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}
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}
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var {
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renderScrollComponent,
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...props,
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} = this.props;
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if (!props.scrollEventThrottle) {
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props.scrollEventThrottle = DEFAULT_SCROLL_CALLBACK_THROTTLE;
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}
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if (props.removeClippedSubviews === undefined) {
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props.removeClippedSubviews = true;
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}
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Object.assign(props, {
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onScroll: this._onScroll,
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stickyHeaderIndices: this.props.stickyHeaderIndices.concat(sectionHeaderIndices),
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// Do not pass these events downstream to ScrollView since they will be
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// registered in ListView's own ScrollResponder.Mixin
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onKeyboardWillShow: undefined,
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onKeyboardWillHide: undefined,
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onKeyboardDidShow: undefined,
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onKeyboardDidHide: undefined,
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});
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return cloneReferencedElement(renderScrollComponent(props), {
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ref: this._setScrollComponentRef,
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onContentSizeChange: this._onContentSizeChange,
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onLayout: this._onLayout,
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}, header, bodyComponents, footer);
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},
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/**
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* Private methods
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*/
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_measureAndUpdateScrollProps: function() {
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var scrollComponent = this.getScrollResponder();
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if (!scrollComponent || !scrollComponent.getInnerViewNode) {
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return;
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}
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// RCTScrollViewManager.calculateChildFrames is not available on
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// every platform
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RCTScrollViewManager && RCTScrollViewManager.calculateChildFrames &&
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RCTScrollViewManager.calculateChildFrames(
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ReactNative.findNodeHandle(scrollComponent),
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this._updateVisibleRows,
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);
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},
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_setScrollComponentRef: function(scrollComponent) {
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this._scrollComponent = scrollComponent;
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},
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_onContentSizeChange: function(width, height) {
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var contentLength = !this.props.horizontal ? height : width;
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if (contentLength !== this.scrollProperties.contentLength) {
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this.scrollProperties.contentLength = contentLength;
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this._updateVisibleRows();
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this._renderMoreRowsIfNeeded();
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}
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this.props.onContentSizeChange && this.props.onContentSizeChange(width, height);
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},
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_onLayout: function(event) {
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var {width, height} = event.nativeEvent.layout;
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var visibleLength = !this.props.horizontal ? height : width;
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if (visibleLength !== this.scrollProperties.visibleLength) {
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this.scrollProperties.visibleLength = visibleLength;
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this._updateVisibleRows();
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this._renderMoreRowsIfNeeded();
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}
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this.props.onLayout && this.props.onLayout(event);
|
|
},
|
|
|
|
_maybeCallOnEndReached: function(event) {
|
|
if (this.props.onEndReached &&
|
|
this.scrollProperties.contentLength !== this._sentEndForContentLength &&
|
|
this._getDistanceFromEnd(this.scrollProperties) < this.props.onEndReachedThreshold &&
|
|
this.state.curRenderedRowsCount === (this.props.enableEmptySections ? this.props.dataSource.getRowAndSectionCount() : this.props.dataSource.getRowCount())) {
|
|
this._sentEndForContentLength = this.scrollProperties.contentLength;
|
|
this.props.onEndReached(event);
|
|
return true;
|
|
}
|
|
return false;
|
|
},
|
|
|
|
_renderMoreRowsIfNeeded: function() {
|
|
if (this.scrollProperties.contentLength === null ||
|
|
this.scrollProperties.visibleLength === null ||
|
|
this.state.curRenderedRowsCount === (this.props.enableEmptySections ? this.props.dataSource.getRowAndSectionCount() : this.props.dataSource.getRowCount())) {
|
|
this._maybeCallOnEndReached();
|
|
return;
|
|
}
|
|
|
|
var distanceFromEnd = this._getDistanceFromEnd(this.scrollProperties);
|
|
if (distanceFromEnd < this.props.scrollRenderAheadDistance) {
|
|
this._pageInNewRows();
|
|
}
|
|
},
|
|
|
|
_pageInNewRows: function() {
|
|
this.setState((state, props) => {
|
|
var rowsToRender = Math.min(
|
|
state.curRenderedRowsCount + props.pageSize,
|
|
(props.enableEmptySections ? props.dataSource.getRowAndSectionCount() : props.dataSource.getRowCount())
|
|
);
|
|
this._prevRenderedRowsCount = state.curRenderedRowsCount;
|
|
return {
|
|
curRenderedRowsCount: rowsToRender
|
|
};
|
|
}, () => {
|
|
this._measureAndUpdateScrollProps();
|
|
this._prevRenderedRowsCount = this.state.curRenderedRowsCount;
|
|
});
|
|
},
|
|
|
|
_getDistanceFromEnd: function(scrollProperties) {
|
|
return scrollProperties.contentLength - scrollProperties.visibleLength - scrollProperties.offset;
|
|
},
|
|
|
|
_updateVisibleRows: function(updatedFrames) {
|
|
if (!this.props.onChangeVisibleRows) {
|
|
return; // No need to compute visible rows if there is no callback
|
|
}
|
|
if (updatedFrames) {
|
|
updatedFrames.forEach((newFrame) => {
|
|
this._childFrames[newFrame.index] = merge(newFrame);
|
|
});
|
|
}
|
|
var isVertical = !this.props.horizontal;
|
|
var dataSource = this.props.dataSource;
|
|
var visibleMin = this.scrollProperties.offset;
|
|
var visibleMax = visibleMin + this.scrollProperties.visibleLength;
|
|
var allRowIDs = dataSource.rowIdentities;
|
|
|
|
var header = this.props.renderHeader && this.props.renderHeader();
|
|
var totalIndex = header ? 1 : 0;
|
|
var visibilityChanged = false;
|
|
var changedRows = {};
|
|
for (var sectionIdx = 0; sectionIdx < allRowIDs.length; sectionIdx++) {
|
|
var rowIDs = allRowIDs[sectionIdx];
|
|
if (rowIDs.length === 0) {
|
|
continue;
|
|
}
|
|
var sectionID = dataSource.sectionIdentities[sectionIdx];
|
|
if (this.props.renderSectionHeader) {
|
|
totalIndex++;
|
|
}
|
|
var visibleSection = this._visibleRows[sectionID];
|
|
if (!visibleSection) {
|
|
visibleSection = {};
|
|
}
|
|
for (var rowIdx = 0; rowIdx < rowIDs.length; rowIdx++) {
|
|
var rowID = rowIDs[rowIdx];
|
|
var frame = this._childFrames[totalIndex];
|
|
totalIndex++;
|
|
if (!frame) {
|
|
break;
|
|
}
|
|
var rowVisible = visibleSection[rowID];
|
|
var min = isVertical ? frame.y : frame.x;
|
|
var max = min + (isVertical ? frame.height : frame.width);
|
|
if (min > visibleMax || max < visibleMin) {
|
|
if (rowVisible) {
|
|
visibilityChanged = true;
|
|
delete visibleSection[rowID];
|
|
if (!changedRows[sectionID]) {
|
|
changedRows[sectionID] = {};
|
|
}
|
|
changedRows[sectionID][rowID] = false;
|
|
}
|
|
} else if (!rowVisible) {
|
|
visibilityChanged = true;
|
|
visibleSection[rowID] = true;
|
|
if (!changedRows[sectionID]) {
|
|
changedRows[sectionID] = {};
|
|
}
|
|
changedRows[sectionID][rowID] = true;
|
|
}
|
|
}
|
|
if (!isEmpty(visibleSection)) {
|
|
this._visibleRows[sectionID] = visibleSection;
|
|
} else if (this._visibleRows[sectionID]) {
|
|
delete this._visibleRows[sectionID];
|
|
}
|
|
}
|
|
visibilityChanged && this.props.onChangeVisibleRows(this._visibleRows, changedRows);
|
|
},
|
|
|
|
_onScroll: function(e) {
|
|
var isVertical = !this.props.horizontal;
|
|
this.scrollProperties.visibleLength = e.nativeEvent.layoutMeasurement[
|
|
isVertical ? 'height' : 'width'
|
|
];
|
|
this.scrollProperties.contentLength = e.nativeEvent.contentSize[
|
|
isVertical ? 'height' : 'width'
|
|
];
|
|
this.scrollProperties.offset = e.nativeEvent.contentOffset[
|
|
isVertical ? 'y' : 'x'
|
|
];
|
|
this._updateVisibleRows(e.nativeEvent.updatedChildFrames);
|
|
if (!this._maybeCallOnEndReached(e)) {
|
|
this._renderMoreRowsIfNeeded();
|
|
}
|
|
|
|
if (this.props.onEndReached &&
|
|
this._getDistanceFromEnd(this.scrollProperties) > this.props.onEndReachedThreshold) {
|
|
// Scrolled out of the end zone, so it should be able to trigger again.
|
|
this._sentEndForContentLength = null;
|
|
}
|
|
|
|
this.props.onScroll && this.props.onScroll(e);
|
|
},
|
|
});
|
|
|
|
module.exports = ListView;
|