Code coverage report for src/plank.js

# all files / src/ plank.js

47.83% Statements 33/69
31.11% Branches 14/45
28.57% Functions 6/21
18.18% Lines 6/33
1 statement Ignored

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     import React from 'react'; EIIEE

    export default class Plank extends React.Component {
        constructor(props) {
            super(props);

            // Cache when heights have been set at particular breakpoints. Don't execute the callback since the
            // parent will already have a cached value.
            // TODO -- This will need to be bypassed when new content comes in and height actually changes.
            this.state = {
                plankWidth: null, // Cache the current width. Use to determine responsiveness.
                breakpointsRendered: {}
            };
        }

        /**
         * plankWidth doesn't get set here since the initial render will have no relevant data from the parent
         * plank container
         */
        componentDidMount() {
            if (!this.props.children.props.hasImage) {
                this.handleHeightSet();
            }
        }

        componentWillReceiveProps(nextProps) {
            // Indicates a responsive resize has occurred.
            if (this.state.plankWidth !== nextProps.plankWidth) {
                // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] setting plank width to: ' + nextProps.plankWidth);
                this.setState({ plankWidth: nextProps.plankWidth });
                if (!this.state.breakpointsRendered[this.state.plankWidth]) {
                    if (this.props.handleLastPlank()) {
                        // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] last hidden plank rendered');
                    };
                }
            }
        }

        /**
         * Determines when a responsive re-size has occurred.
         */
        componentDidUpdate(prevProps, prevState) {
            if (prevState.plankWidth === null) {
                return; // Do nothing when the component first loads.
            }

            if (prevState.plankWidth !== this.state.plankWidth) {
                if (!this.previouslyRendered()) {
                    this.updateBreakpointRenderings();
                    // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] new width detected... sending new height to planks container...');
                    this.sendHeightToPlanksContainer();

                } else {
                    // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] change in width detected. previously rendered. nothing to do here.');
                }
            }
        }

        /**
         * @return Boolean
         */
        previouslyRendered() {
            return this.state.breakpointsRendered[this.state.plankWidth] !== undefined;
        }

        updateBreakpointRenderings() {
            let updatedBreakpointRenderings = this.state.breakpointsRendered;

            updatedBreakpointRenderings[this.state.plankWidth] = true;
            this.setState({ breakpointsRendered: updatedBreakpointRenderings });
        }

        handleHeightSet() {
            window.requestAnimationFrame(() => {
                // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] height being set (requestAnimationFrame)');
                // If we're here, this assumes that the height has not been previously set for this breakpoint/plank width.
                this.updateBreakpointRenderings();
                this.sendHeightToPlanksContainer();
            });
        }

        sendHeightToPlanksContainer() {
            this.props.updateChildHeight(this.props.index, this.elRef.offsetHeight);
        }

        handleImageLoad() {
            // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] image loaded!');
            this.sendHeightToPlanksContainer();
        }

        /**
         * Same for now as this.handleImageLoad but we might want to do something different in the future e.g. hide the
         * broken image icon.
         */
        handleImageLoadError() {
            // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] error loading image');
            this.sendHeightToPlanksContainer();
        }

        /**
         * For optimization there are 3 general conditions for rendering invidivual planks:
         *      1. plank width is first set and visibility is hidden since height is unknown
         *      2. plank height has been set and our owner, <Planks />, has determined our position
         *      3. responsive re-size has occurred, potentially starting (1) and (2) over again unless cached
         */
        render() {
            // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] single plank rendering...');
            // console.log('[SINGLE PLANK INDEX ' + this.props.index + '] visibility: ' + this.props.plankStyles.visibility);
            return (
                <div
                    onLoad={ this.handleImageLoad.bind(this) }
                    onError={ this.handleImageLoadError.bind(this) }
                    className='plank'
                    style={ this.props.plankStyles }
                    ref={ (c) => this.elRef = c }
                >
                    { this.props.children }
                </div>
            );
        }
    }