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React components are self-contained units of UI logic that encapsulate markup, state, and behavior. They define isolated UI logic using JavaScript functions or classes. JSX defines component structure using a declarative syntax that compiles to `React.createElement` calls. React maintains a virtual DOM to track state changes and compute minimal updates. In video applications, components manage player interfaces, control logic, playback state, and interactive overlays. Types of React Components React defines components as either functions or classes. Both types receive props and return UI elements. Functional components use hooks to manage state and side effects. Class components extend a base class and rely on lifecycle methods. Each type executes within the same rendering model but handles logic differently. Functional Components Functional components use plain JavaScript functions to return JSX. React runs these functions on each render. Hooks such as useState manage internal state without class syntax. Functional components recompute output when state or props change. Example: import { useState } from 'react'; function VideoPlayer({ src }) { const [playing, setPlaying] = useState(false); const togglePlayback = () => { setPlaying(prev => !prev); }; return (
{playing ? 'Pause' : 'Play'}
); } Explanation: Initializes a playing state variable to false (video is paused by default). setPlaying is the corresponding state updater function. useState(false) ensures the state persists across renders and triggers UI updates when modified. Class Components Class components inherit from React.Component and implement a render method to return JSX. They initialize the state in the constructor and update it. Arrow functions bind methods like togglePlayback to the class instance. React calls render on each state or prop change to update the UI.s Example: import React from 'react'; class VideoPlayer extends React.Component { constructor(props) { super(props); this.state = { playing: false }; } togglePlayback = () => { this.setState(prevState => ({ playing: !prevState.playing })); }; render() { const { src } = this.props; const { playing } = this.state; return (
{playing ? 'Pause' : 'Play'}
); } } Explanation: constructor(props) initializes the component and receives props. super(props) passes props to the parent React.Component constructor. this.state = { playing: false } sets the initial internal state; video is paused by default. Functional vs. Class Components How JSX Compiles and Renders DOM Efficiently JSX defines UI using HTML-like syntax within JavaScript. React compiles JSX into React.createElement calls. JSX supports embedding expressions, attributes, and nested structures. React parses JSX during build time and converts it into a virtual DOM structure. This structure combines component logic and layout in a single unit. JSX Structure and Rules JSX uses standard JavaScript syntax rules. Void elements require self-closing tags, such as
. Curly braces embed JavaScript expressions within markup. Attributes use camelCase, with className replacing class. Boolean attributes must be assigned explicitly, such as controls={true}. JSX also prohibits assigning multiple root elements without a wrapper like
or <>. Example: function Greeting({ user }) { return
Hello, {user.name}!
; } Explanation: className : Maps to class. {user.name} : Embeds JS expression. Video Workflow with React React simplifies complex video UIs through composability and declarative syntax. React uses a component-based model to define UI. Each component contains its structure, logic, and state. The virtual DOM computes changes and applies minimal updates to the real DOM. React updates components based on state or prop changes. Components can nest and compose into larger UI structures. Context and hooks provide shared state and side-effect management. Custom Video Player Component Custom components in React manage playback by combining state and references. The useState hook tracks playback status, while useRef accesses the video element for control. Logic inside event handlers updates both the UI and playback behavior. This setup connects user interaction with media state through React’s controlled component structure. Example: import { useState, useRef } from 'react'; function CustomPlayer({ url }) { const [isPlaying, setIsPlaying] = useState(false); const videoRef = useRef(null); const togglePlay = () => { if (isPlaying) videoRef.current.pause(); else videoRef.current.play(); setIsPlaying(!isPlaying); }; return (
{isPlaying ? 'Pause' : 'Play'}
); } Explanation: useRef : Points to
node. togglePlay : Pauses or plays video. Rendering Video Metadata React renders metadata by computing values inside components. Functions like formatTime convert raw data before output. JSX uses these values based on props without changing them. This keeps formatting and layout logic within a single component. Example: function VideoInfo({ duration, views }) { const formatTime = (seconds) => new Date(seconds * 1000).toISOString().substr(11, 8); return (
Duration: {formatTime(duration)}
Views: {views.toLocaleString()}
); } Explanation: formatTime : Formats seconds to HH:MM:SS. toLocaleString() : Adds commas. Integrating Third-Party Video Libraries React loads third-party video libraries as components. It passes configuration through props to components like react-player. JSX places these components in the render tree. React triggers updates by changing props or re-rendering the parent component. Example: import ReactPlayer from 'react-player'; function StreamPlayer() { return (
); } Explanation: controls : Built-in UI. width/height : Responsive props. Handling Playback State React handles playback state by connecting components to a global store using Redux. useSelector reads the current playback state from the store. useDispatch sends actions to update the state. React re-renders the component when the store updates, keeping the UI in sync with playback status. Example: import { useSelector, useDispatch } from 'react-redux'; import { play, pause } from './videoSlice'; function ReduxPlayer() { const isPlaying = useSelector(state => state.video.isPlaying); const dispatch = useDispatch(); return (
isPlaying ? dispatch(pause()) : dispatch(play())}> {isPlaying ? 'Pause' : 'Play'}
); } Explanation: useSelector : Reads from store. dispatch : Sends actions.
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