react-native/Examples/UIExplorer/ListViewPagingExample.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ListViewPagingExample
 * @flow
 */
'use strict';

var React = require('react-native');
var {
  Image,
  LayoutAnimation,
  ListView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} = React;

var PAGE_SIZE = 4;
var THUMB_URLS = ['https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-ash3/t39.1997/p128x128/851549_767334479959628_274486868_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851561_767334496626293_1958532586_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-ash3/t39.1997/p128x128/851579_767334503292959_179092627_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851589_767334513292958_1747022277_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851563_767334559959620_1193692107_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851593_767334566626286_1953955109_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851591_767334523292957_797560749_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851567_767334529959623_843148472_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851548_767334489959627_794462220_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851575_767334539959622_441598241_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-ash3/t39.1997/p128x128/851573_767334549959621_534583464_n.png', 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851583_767334573292952_1519550680_n.png'];
var NUM_SECTIONS = 100;
var NUM_ROWS_PER_SECTION = 10;

var Thumb = React.createClass({
  getInitialState: function() {
    return {thumbIndex: this._getThumbIdx(), dir: 'row'};
  },
  _getThumbIdx: function() {
    return Math.floor(Math.random() * THUMB_URLS.length);
  },
  _onPressThumb: function() {
    var config = layoutAnimationConfigs[this.state.thumbIndex % layoutAnimationConfigs.length];
    LayoutAnimation.configureNext(config);
    this.setState({
      thumbIndex: this._getThumbIdx(),
      dir: this.state.dir === 'row' ? 'column' : 'row',
    });
  },
  render: function() {
    return (
      <TouchableOpacity onPress={this._onPressThumb}>
        <View style={[styles.buttonContents, {flexDirection: this.state.dir}]}>
          <Image style={styles.img} source={{uri: THUMB_URLS[this.state.thumbIndex]}} />
          <Image style={styles.img} source={{uri: THUMB_URLS[this.state.thumbIndex]}} />
          <Image style={styles.img} source={{uri: THUMB_URLS[this.state.thumbIndex]}} />
          {this.state.dir === 'column' ?
            <Text>
              Oooo, look at this new text!  So awesome it may just be crazy.
              Let me keep typing here so it wraps at least one line.
            </Text> :
            <Text />
          }
        </View>
      </TouchableOpacity>
    );
  }
});

var ListViewPagingExample = React.createClass({
  statics: {
    title: '<ListView> - Paging',
    description: 'Floating headers & layout animations.'
  },

  getInitialState: function() {
    var getSectionData = (dataBlob, sectionID) => {
      return dataBlob[sectionID];
    };
    var getRowData = (dataBlob, sectionID, rowID) => {
      return dataBlob[rowID];
    };

    var dataSource = new ListView.DataSource({
      getRowData: getRowData,
      getSectionHeaderData: getSectionData,
      rowHasChanged: (row1, row2) => row1 !== row2,
      sectionHeaderHasChanged: (s1, s2) => s1 !== s2,
    });

    var dataBlob = {};
    var sectionIDs = [];
    var rowIDs = [];
    for (var ii = 0; ii < NUM_SECTIONS; ii++) {
      var sectionName = 'Section ' + ii;
      sectionIDs.push(sectionName);
      dataBlob[sectionName] = sectionName;
      rowIDs[ii] = [];

      for (var jj = 0; jj < NUM_ROWS_PER_SECTION; jj++) {
        var rowName = 'S' + ii + ', R' + jj;
        rowIDs[ii].push(rowName);
        dataBlob[rowName] = rowName;
      }
    }
    return {
      dataSource: dataSource.cloneWithRowsAndSections(dataBlob, sectionIDs, rowIDs),
      headerPressCount: 0,
    };
  },

  renderRow: function(rowData: string, sectionID: string, rowID: string): ReactElement {
    return (<Thumb text={rowData}/>);
  },

  renderSectionHeader: function(sectionData: string, sectionID: string) {
    return (
      <View style={styles.section}>
        <Text style={styles.text}>
          {sectionData}
        </Text>
      </View>
    );
  },

  renderHeader: function() {
    var headerLikeText = this.state.headerPressCount % 2 ?
      <View><Text style={styles.text}>1 Like</Text></View> :
      null;
    return (
      <TouchableOpacity onPress={this._onPressHeader}>
        <View style={styles.header}>
          {headerLikeText}
          <View>
            <Text style={styles.text}>
              Table Header (click me)
            </Text>
          </View>
        </View>
      </TouchableOpacity>
    );
  },

  renderFooter: function() {
    return (
      <View style={styles.header}>
        <Text onPress={() => console.log('Footer!')} style={styles.text}>
          Table Footer
        </Text>
      </View>
    );
  },

  render: function() {
    return (
      <ListView
        style={styles.listview}
        dataSource={this.state.dataSource}
        onChangeVisibleRows={(visibleRows, changedRows) => console.log({visibleRows, changedRows})}
        renderHeader={this.renderHeader}
        renderFooter={this.renderFooter}
        renderSectionHeader={this.renderSectionHeader}
        renderRow={this.renderRow}
        initialListSize={10}
        pageSize={PAGE_SIZE}
        scrollRenderAheadDistance={2000}
      />
    );
  },

  _onPressHeader: function() {
    var config = layoutAnimationConfigs[Math.floor(this.state.headerPressCount / 2) % layoutAnimationConfigs.length];
    LayoutAnimation.configureNext(config);
    this.setState({headerPressCount: this.state.headerPressCount + 1});
  },

});

var styles = StyleSheet.create({
  listview: {
    backgroundColor: '#B0C4DE',
  },
  header: {
    height: 40,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#3B5998',
    flexDirection: 'row',
  },
  text: {
    color: 'white',
    paddingHorizontal: 8,
  },
  rowText: {
    color: '#888888',
  },
  thumbText: {
    fontSize: 20,
    color: '#888888',
  },
  buttonContents: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    marginHorizontal: 5,
    marginVertical: 3,
    padding: 5,
    backgroundColor: '#EAEAEA',
    borderRadius: 3,
    paddingVertical: 10,
  },
  img: {
    width: 64,
    height: 64,
    marginHorizontal: 10,
  },
  section: {
    flexDirection: 'column',
    justifyContent: 'center',
    alignItems: 'flex-start',
    padding: 6,
    backgroundColor: '#5890ff',
  },
});

var animations = {
  layout: {
    spring: {
      duration: 0.75,
      create: {
        duration: 0.3,
        type: LayoutAnimation.Types.easeInEaseOut,
        property: LayoutAnimation.Properties.opacity,
      },
      update: {
        type: LayoutAnimation.Types.spring,
        springDamping: 0.4,
      },
    },
    easeInEaseOut: {
      duration: 0.3,
      create: {
        type: LayoutAnimation.Types.easeInEaseOut,
        property: LayoutAnimation.Properties.scaleXY,
      },
      update: {
        delay: 0.1,
        type: LayoutAnimation.Types.easeInEaseOut,
      },
    },
  },
};

var layoutAnimationConfigs = [
  animations.layout.spring,
  animations.layout.easeInEaseOut,
];

module.exports = ListViewPagingExample;