New: Browse Lists from Discover Movies Page

frontend/src/DiscoverMovie/Overview/DiscoverMovieOverviews.js

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+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
+import { Grid, WindowScroller } from 'react-virtualized';
+import Measure from 'Components/Measure';
+import DiscoverMovieItemConnector from 'DiscoverMovie/DiscoverMovieItemConnector';
+import dimensions from 'Styles/Variables/dimensions';
+import getIndexOfFirstCharacter from 'Utilities/Array/getIndexOfFirstCharacter';
+import hasDifferentItemsOrOrder from 'Utilities/Object/hasDifferentItemsOrOrder';
+import DiscoverMovieOverviewConnector from './DiscoverMovieOverviewConnector';
+import styles from './DiscoverMovieOverviews.css';
+
+// Poster container dimensions
+const columnPadding = parseInt(dimensions.movieIndexColumnPadding);
+const columnPaddingSmallScreen = parseInt(dimensions.movieIndexColumnPaddingSmallScreen);
+
+function calculatePosterWidth(posterSize, isSmallScreen) {
+  const maxiumPosterWidth = isSmallScreen ? 152 : 162;
+
+  if (posterSize === 'large') {
+    return maxiumPosterWidth;
+  }
+
+  if (posterSize === 'medium') {
+    return Math.floor(maxiumPosterWidth * 0.75);
+  }
+
+  return Math.floor(maxiumPosterWidth * 0.5);
+}
+
+function calculateRowHeight(posterHeight, sortKey, isSmallScreen, overviewOptions) {
+
+  const heights = [
+    posterHeight,
+    isSmallScreen ? columnPaddingSmallScreen : columnPadding
+  ];
+
+  return heights.reduce((acc, height) => acc + height, 0);
+}
+
+function calculatePosterHeight(posterWidth) {
+  return Math.ceil((250 / 170) * posterWidth);
+}
+
+class DiscoverMovieOverviews extends Component {
+
+  //
+  // Lifecycle
+
+  constructor(props, context) {
+    super(props, context);
+
+    this.state = {
+      width: 0,
+      columnCount: 1,
+      posterWidth: 162,
+      posterHeight: 238,
+      rowHeight: calculateRowHeight(238, null, props.isSmallScreen, {})
+    };
+
+    this._grid = null;
+  }
+
+  componentDidUpdate(prevProps, prevState) {
+    const {
+      items,
+      sortKey,
+      overviewOptions,
+      jumpToCharacter
+    } = this.props;
+
+    const {
+      width,
+      rowHeight
+    } = this.state;
+
+    if (prevProps.sortKey !== sortKey ||
+        prevProps.overviewOptions !== overviewOptions) {
+      this.calculateGrid();
+    }
+
+    if (this._grid &&
+        (prevState.width !== width ||
+            prevState.rowHeight !== rowHeight ||
+            hasDifferentItemsOrOrder(prevProps.items, items, 'tmdbId'))) {
+      // recomputeGridSize also forces Grid to discard its cache of rendered cells
+      this._grid.recomputeGridSize();
+    }
+
+    if (jumpToCharacter != null && jumpToCharacter !== prevProps.jumpToCharacter) {
+      const index = getIndexOfFirstCharacter(items, jumpToCharacter);
+
+      if (this._grid && index != null) {
+
+        this._grid.scrollToCell({
+          rowIndex: index,
+          columnIndex: 0
+        });
+      }
+    }
+  }
+
+  //
+  // Control
+
+  setGridRef = (ref) => {
+    this._grid = ref;
+  }
+
+  calculateGrid = (width = this.state.width, isSmallScreen) => {
+    const {
+      sortKey,
+      overviewOptions
+    } = this.props;
+
+    const posterWidth = calculatePosterWidth(overviewOptions.size, isSmallScreen);
+    const posterHeight = calculatePosterHeight(posterWidth);
+    const rowHeight = calculateRowHeight(posterHeight, sortKey, isSmallScreen, overviewOptions);
+
+    this.setState({
+      width,
+      posterWidth,
+      posterHeight,
+      rowHeight
+    });
+  }
+
+  cellRenderer = ({ key, rowIndex, style }) => {
+    const {
+      items,
+      sortKey,
+      overviewOptions,
+      showRelativeDates,
+      shortDateFormat,
+      longDateFormat,
+      timeFormat,
+      isSmallScreen,
+      selectedState,
+      onSelectedChange
+    } = this.props;
+
+    const {
+      posterWidth,
+      posterHeight,
+      rowHeight
+    } = this.state;
+
+    const movie = items[rowIndex];
+
+    if (!movie) {
+      return null;
+    }
+
+    return (
+      <div
+        className={styles.container}
+        key={key}
+        style={style}
+      >
+        <DiscoverMovieItemConnector
+          key={movie.tmdbId}
+          component={DiscoverMovieOverviewConnector}
+          sortKey={sortKey}
+          posterWidth={posterWidth}
+          posterHeight={posterHeight}
+          rowHeight={rowHeight}
+          overviewOptions={overviewOptions}
+          showRelativeDates={showRelativeDates}
+          shortDateFormat={shortDateFormat}
+          longDateFormat={longDateFormat}
+          timeFormat={timeFormat}
+          isSmallScreen={isSmallScreen}
+          movieId={movie.tmdbId}
+          isSelected={selectedState[movie.tmdbId]}
+          onSelectedChange={onSelectedChange}
+        />
+      </div>
+    );
+  }
+
+  //
+  // Listeners
+
+  onMeasure = ({ width }) => {
+    this.calculateGrid(width, this.props.isSmallScreen);
+  }
+
+  //
+  // Render
+
+  render() {
+    const {
+      isSmallScreen,
+      scroller,
+      items,
+      selectedState
+    } = this.props;
+
+    const {
+      width,
+      rowHeight
+    } = this.state;
+
+    return (
+      <Measure
+        whitelist={['width']}
+        onMeasure={this.onMeasure}
+      >
+        <WindowScroller
+          scrollElement={isSmallScreen ? undefined : scroller}
+        >
+          {({ height, registerChild, onChildScroll, scrollTop }) => {
+            if (!height) {
+              return <div />;
+            }
+
+            return (
+              <div ref={registerChild}>
+                <Grid
+                  ref={this.setGridRef}
+                  className={styles.grid}
+                  autoHeight={true}
+                  height={height}
+                  columnCount={1}
+                  columnWidth={width}
+                  rowCount={items.length}
+                  rowHeight={rowHeight}
+                  width={width}
+                  onScroll={onChildScroll}
+                  scrollTop={scrollTop}
+                  overscanRowCount={2}
+                  cellRenderer={this.cellRenderer}
+                  selectedState={selectedState}
+                  scrollToAlignment={'start'}
+                  isScrollingOptout={true}
+                />
+              </div>
+            );
+          }
+          }
+        </WindowScroller>
+      </Measure>
+    );
+  }
+}
+
+DiscoverMovieOverviews.propTypes = {
+  items: PropTypes.arrayOf(PropTypes.object).isRequired,
+  sortKey: PropTypes.string,
+  overviewOptions: PropTypes.object.isRequired,
+  jumpToCharacter: PropTypes.string,
+  scroller: PropTypes.instanceOf(Element).isRequired,
+  showRelativeDates: PropTypes.bool.isRequired,
+  shortDateFormat: PropTypes.string.isRequired,
+  longDateFormat: PropTypes.string.isRequired,
+  isSmallScreen: PropTypes.bool.isRequired,
+  timeFormat: PropTypes.string.isRequired,
+  selectedState: PropTypes.object.isRequired,
+  onSelectedChange: PropTypes.func.isRequired
+};
+
+export default DiscoverMovieOverviews;