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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | 1x 1x 1x 1x 1x 5x 5x 5x 5x 5x 1x 1x 10x 5x 5x 5x 5x 5x 5x 5x | import React from "react"; import { canUseDOM } from "exenv-es6"; import { Breakpoints, defaultBreakpoints, identifyBreakpoint } from "./breakpoints"; export interface BreakpointTrackerProps { /** * The render method */ render: (activeBreakpoint: number | void) => React.ReactNode; } export interface BreakpointTrackerState { /** * The active breakpoint as an index of the Breakpoints array */ activeBreakpoint: number | void; } export default class BreakpointTracker extends React.Component< BreakpointTrackerProps, BreakpointTrackerState > { /** * The array of breakpoint values */ public static breakpoints: Breakpoints = defaultBreakpoints; /** * Track if we have an open animation frame request */ private openRequestAnimationFrame: boolean; /** * Constructor for the BreakpointTracker component. */ constructor(props: BreakpointTrackerProps) { super(props); this.state = { activeBreakpoint: null, }; } /** * React life-cycle method */ public componentDidMount(): void { // We are doing this work in a lifecycle method instead of the constructor to ensure that // server rendered instances with conditional DOM rendering by breakpoint will be re-rendered. // ReactDOM.hydrate() will call the constructor again, but it does not trigger a re-render. It will only bind event handlers. // The only way to ensure the correct DOM is consistently rendered on the client is to perform this work here. Eif (canUseDOM()) { this.updateBreakpoint(); window.addEventListener("resize", this.requestFrame); } } /** * React life-cycle method */ public componentWillUnmount(): void { Eif (canUseDOM()) { window.removeEventListener("resize", this.requestFrame); } } /** * React render method */ public render(): React.ReactNode { return this.props.render(this.state.activeBreakpoint); } /** * Updates the active breakpoint */ private updateBreakpoint = (): void => { const windowWidth: number = window.innerWidth; const breakpoint: number | void = identifyBreakpoint( windowWidth, BreakpointTracker.breakpoints ); Eif (this.state.activeBreakpoint !== breakpoint) { this.setState({ activeBreakpoint: breakpoint, }); } this.openRequestAnimationFrame = false; }; /** * Request's an animation frame if there are currently no open animation frame requests */ private requestFrame = (): void => { if (!this.openRequestAnimationFrame) { this.openRequestAnimationFrame = true; window.requestAnimationFrame(this.updateBreakpoint); } }; } |