All files / src/Components HorizontalTimeline.jsx

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import React, { PropTypes } from 'react';
import { Motion, spring } from 'react-motion';
 
// decorators
import Radium from 'radium';
 
import { zip, daydiff, cummulativeSeperation } from '../helpers';
import Constants from '../Constants';
import TimelineDot from './TimelineDot';
import HorizontalTimelineButtons from './HorizontalTimelineButtons';
import Faders from './Faders';
 
 
/*
 * This is the Horizontal Timeline. This component expects an array of dates
 * just as strings (e.g. 1/1/1993) and layes them horizontaly on the the screen
 * also expects a callback which is activated when that particular index is
 * clicked passing that index along
 */
class HorizontalTimeline extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      position: 0,
      selected: 0,
      filledValue: 0
    };
    this.touch = {
      coors: {
        x: 0,
        y: 0,
      },
      isSwiping: false,
      started: false,
      threshold: 3
    }
  }
 
  /**
   * The expected properties from the parent
   * @type {Object}
   */
  static propTypes = {
    index: PropTypes.number,
    //  array containing the dates
    values: PropTypes.array.isRequired,
    //  function that takes the index of the array as argument
    indexClick: PropTypes.func,
    // The minimum distance between consecutive events
    eventsMinDistance: PropTypes.number,
    styles: PropTypes.object,
    fillingMotion: PropTypes.object,
    slidingMotion: PropTypes.object
  };
  /**
   * The values that the properties will take if they are not provided
   * by the user.
   * @type {Object}
   */
  static defaultProps = {
    eventsMinDistance: 80,
    styles: {
      outline: '#dfdfdf',
      background: '#f8f8f8',
      foreground: '#7b9d6f',
      maxSize: '90%'
    },
    fillingMotion: {stiffness: 150, damping: 25},
    slidingMotion: {stiffness: 150, damping: 25},
    isTouchEnabled: true
  };
 
  componentWillMount() {
    document.body.addEventListener('keydown', this.__move__);
    this.__setUpState__(this.props);
  }
 
  componentWillReceiveProps(nextProps) {
    this.__setUpState__(nextProps);
  }
 
  componentWillUnmount() {
    document.body.removeEventListener('keydown', this.__move__);
  }
 
  handleTouchStart = (event) => {
    const touchObj = event.touches[0];
 
    this.touch.coors.x = touchObj.pageX;
    this.touch.coors.y = touchObj.pageY;
    this.touch.isSwiping = false;
    this.touch.started = true;
  };
 
  handleTouchMove = (event) => {
    const wrapperWidth = Number(
      getComputedStyle(document.getElementsByClassName('events-wrapper')[0])['width']
        .replace('px', '')
    );
    if (!this.touch.started) I{
      this.handleTouchStart(event);
      return;
    }
 
    const touchObj = event.touches[0];
    const dx = Math.abs(this.touch.coors.x - touchObj.pageX);
    const dy = Math.abs(this.touch.coors.y - touchObj.pageY);
 
    const isSwiping = dx > dy && dx > this.touch.threshold;
 
    if (isSwiping === true || dx > this.touch.threshold || dy > this.touch.threshold) I{
      this.touch.isSwiping = isSwiping;
      var dX = this.touch.coors.x - touchObj.pageX; // amount scrolled
      this.touch.coors.x = touchObj.pageX;
      this.setState({
        position: this.state.position - (dX) // set new position
      });
    }
    if (this.touch.isSwiping !== true) I{
      return;
    }
    // Prevent native scrolling
    event.preventDefault();
  };
 
  handleTouchEnd = (event) => {
    const wrapperWidth = Number(
      getComputedStyle(document.getElementsByClassName('events-wrapper')[0])['width']
        .replace('px', '')
    );
    const barWidth = Number(
      getComputedStyle(document.getElementsByClassName('events-bar')[0])['width']
        .replace('px', '')
    );
    if (this.state.position > 0) {  // if already at start
      this.setState({
        position: 0
      });
    } else if ((barWidth - wrapperWidth + this.state.position) < 0) I{
      // if scrolled more than the available space
      var pos = wrapperWidth - barWidth;
      this.setState({
        position: pos
      });
    }
    this.touch.coors.x = 0;
    this.touch.coors.y = 0;
    this.touch.isSwiping = false;
    this.touch.started = false;
  };
 
  /**
   * Movement in the horizontal timeline based on the movent from arrow keys
   *
   * @param  {object} event The keypress event
   * @return {undefind} modifies the state (either by translating the timeline or by updateing the
   * dot)
   */
  __move__ = (event) => {
    if (event.keyCode === Constants.LEFT_KEY || event.keyCode === Constants.RIGHT_KEY) {
      this.updateSlide(Constants.KEYMAP[event.keyCode]);
    } else if (event.keyCode === Constants.UP_KEY) {
      this.handleDateClick(Math.min(this.state.selected + 1, this.state.timelineDates.length - 1));
    } else if (event.keyCode === Constants.DOWN_KEY) I{
      this.handleDateClick(Math.max(this.state.selected - 1, 0));
    }
  }
 
  __setUpState__ = (nextProps) => {
    // parsing the dates from all valid formats that the constructor for Date accepts.
    const dates = nextProps.values.map((value) => new Date(value));
    const distances = cummulativeSeperation(
      // dates
      dates,
      // min distance
      nextProps.eventsMinDistance,
      // minimum seperation
      Constants.DAY,
      // maximum seperation
      Constants.MAX_NORMALISED_SEPERATION
    );
 
    // The new state of the horizontal timeline.
    const state = {
      // the distances from the origin of the the timeline
      distanceFromOrigin: distances,
      // parsed format of the dates
      timelineDates: dates,
      // the exact value of the width of the timeline
      totalWidth: Math.max(Constants.MIN_TIMELINE_WIDTH, distances[distances.length - 1] + 100)
    };
 
    // set selected value only if index value is present
    if (nextProps.index) I{
      state.selected = nextProps.index;
    }
 
    this.setState(state, () => {
      this.__updateFilling__(this.state.selected);
    });
  };
 
  /**
   * Updates the the value of the position that the filling bar should take.
   * @param  {number} selected The index of the dot upto which the filling needs to be done.
   * @return {undefind} Nothing just modifies the state withe the new filling value.
   */
  __updateFilling__ = (selected) => {
    // filled value = distane from origin to the selected event + half the space occupied by the
    // date string on screen
    const filledValue = (this.state.distanceFromOrigin[selected] + Constants.DATE_WIDTH / 2) / this.state.totalWidth;
 
    // right now the filledValue contains the value of the transform
    this.setState({
      selected: selected,
      filledValue: filledValue
    });
  };
 
  /**
   * This method translates the timeline by a certaing amount depending on if the direction passed
   * is left or right.
   *
   * @param  {string} direction The direction towards which the timeline will translates
   * @return {undefind} Just modifies the value by which we need to translate the timeline in place
   */
  updateSlide = (direction) => {
    // the width of the timeline component between the two buttons (prev and next)
    const wrapperWidth = Number(
      getComputedStyle(document.getElementsByClassName('events-wrapper')[0])['width']
        .replace('px', '')
    );
 
    //  translate the timeline to the left('next')/right('prev')
    if (direction === Constants.RIGHT) {
      this.setState({
        position: Math.max(this.state.position - wrapperWidth + this.props.eventsMinDistance,
          wrapperWidth - this.state.totalWidth),
        maxPosition: wrapperWidth - this.state.totalWidth
      });
    } else if (direction === Constants.LEFT) I{
      this.setState({
        position: Math.min(0, this.state.position + wrapperWidth - this.props.eventsMinDistance)
      });
    }
  };
 
  /**
   * Invokes the parent prop indexClick with the passed value of the index and then updates the
   * filling bar by calling
   * the __updateFilling__ method.
   *
   * @param  {number} index The index of the timeline dot that we need to go to
   * @return {undefind} modifies the state
   */
  handleDateClick = (index) => {
    this.props.indexClick(index);
    this.__updateFilling__(index);
  };
 
  render() {
    //  creating an array of list items that have an onClick handler into which
    //  passing the index of the clicked entity.
    // NOTE: Improve timeline dates handeling and eventsMinLapse handling
    const valuesList = this.props.values.map((date, index) => (
        <TimelineDot
          distanceFromOrigin={this.state.distanceFromOrigin[index]}
          eventDate={this.state.timelineDates[index]}
          index={index}
          key={index}
          onClick={this.handleDateClick}
          selected={this.state.selected}
          styles={this.props.styles}
        />
      )
    );
    const touchEvents = this.props.isTouchEnabled ? {
      onTouchStart: this.handleTouchStart,
      onTouchMove: this.handleTouchMove,
      onTouchEnd: this.handleTouchEnd,
    } : {};
    return (
      <div style={{ margin: '2em auto' }}
        {...touchEvents}>
        <div style={{
          maxWidth: this.props.styles.maxSize,
          position: 'relative',
          height: 100,
          margin: '0 auto'
        }}>
          <div className='events-wrapper' style={{
            position: 'relative',
            height: '100%',
            margin: '0 40px',
            overflow: 'hidden'
          }}>
            <Motion style={{ X: spring(this.state.position, this.props.slidingMotion) }}>
              {({X}) =>
                <div
                  style={{
                    position: 'absolute',
                    zIndex: 1,
                    left: 0,
                    top: 49,
                    height: 2,
                    background: this.props.styles.outline,
                    width: this.state.totalWidth,
                    WebkitTransform: `translate3d(${X}, 0, 0)px`,
                    transform: `translate3d(${X}px, 0, 0)`
                  }}>
                  <ol className='events-bar' style={{ listStyle: 'none' }}>
                    { valuesList }
                  </ol>
 
                  <Motion style={{ tX: spring(this.state.filledValue, this.props.fillingMotion) }}>
                    {({tX}) =>
                      <span
                        aria-hidden='true'
                        style={{
                          position: 'absolute',
                          zIndex: 1,
                          left: 0,
                          top: 0,
                          height: '100%',
                          width: '100%',
                          transformOrigin: 'left center',
                          backgroundColor: this.props.styles.foreground,
                          WebkitTransform: `scaleX(${tX})`,
                          transform: `scaleX(${tX})`
                        }}>
                      </span>
                    }
                  </Motion>
                </div>
              }
            </Motion>
          </div>
          <Faders styles={this.props.styles}/>
          <HorizontalTimelineButtons
            maxPosition={this.state.maxPosition}
            position={this.state.position}
            styles={this.props.styles}
            updateSlide={this.updateSlide}
          />
        </div>
      </div>
    );
  }
}
 
export default Radium(HorizontalTimeline);