mirror of
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0aea74ebea
Summary: There is a bug in onChangeVisibleRows when the renderSeparator is not null. The _updateVisibleRows function does not account for the presence of separator frames in the _childFrames array. When renderSeparator is not null, increment the totalIndex an additional time for each row that isn't the last in its section, or the last in the entire list. This continues a slightly brittle precedent of having a set of parallel conditions in render and _updateVisibleRows. (i.e. renderSectionHeader is used in both functions, in render as a condition to create a sectionHeader, and in _updateVisibleRows as a condition to increment the totalIndex. Before change:  After change:  Built using https://gist.github.com/dmueller39/f95028f6fe8bd251944bb604e51f18b2 Closes https://github.com/facebook/react-native/pull/6965 Differential Revision: D3328001 Pulled By: vjeux fbshipit-source-id: 977e54382ee07be7a432a54febafcae6acaae905
666 lines
24 KiB
JavaScript
666 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`](docs/listviewdatasource.html), populate it with a simple
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* array of data blobs, and instantiate a `ListView` component with that data
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* source and a `renderRow` callback which takes a blob from the data array and
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* returns a renderable 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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/**
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* An instance of [ListView.DataSource](docs/listviewdatasource.html) to use
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*/
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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(sectionID, rowID)`. This
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* sets a boolean value of adjacentRowHighlighted in renderSeparator, allowing you
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* to control the separators above and below the highlighted row. The highlighted
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* state of 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) {
|
|
this._scrollComponent = scrollComponent;
|
|
},
|
|
|
|
_onContentSizeChange: function(width, height) {
|
|
var contentLength = !this.props.horizontal ? height : width;
|
|
if (contentLength !== this.scrollProperties.contentLength) {
|
|
this.scrollProperties.contentLength = contentLength;
|
|
this._updateVisibleRows();
|
|
this._renderMoreRowsIfNeeded();
|
|
}
|
|
this.props.onContentSizeChange && this.props.onContentSizeChange(width, height);
|
|
},
|
|
|
|
_onLayout: function(event) {
|
|
var {width, height} = event.nativeEvent.layout;
|
|
var visibleLength = !this.props.horizontal ? height : width;
|
|
if (visibleLength !== this.scrollProperties.visibleLength) {
|
|
this.scrollProperties.visibleLength = visibleLength;
|
|
this._updateVisibleRows();
|
|
this._renderMoreRowsIfNeeded();
|
|
}
|
|
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(this.props.renderSeparator &&
|
|
(rowIdx !== rowIDs.length - 1 || sectionIdx === allRowIDs.length - 1)){
|
|
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 && !max) || (min === max)) {
|
|
break;
|
|
}
|
|
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;
|