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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Intro to XState</title> | |
| <link rel="stylesheet" href="styles.css" /> | |
| </head> | |
| <body> | |
| <div id="box"></div> | |
| <script src="https://unpkg.com/xstate@4.8.0/dist/xstate.js"></script> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| const { createMachine, interpret, assign } = XState; | |
| const dragDropMachine = createMachine({ | |
| initial: 'idle', | |
| context: { | |
| // the position of the box | |
| x: 0, | |
| y: 0, | |
| // where you clicked relative to the target element | |
| dx: 0, | |
| dy: 0, | |
| }, | |
| states: { | |
| idle: { | |
| on: { | |
| // event: nextstate | |
| mousedown: { | |
| target: 'dragging', | |
| actions: assign((context, mouseEvent) => { | |
| const boundingRect = mouseEvent.target.getBoundingClientRect() | |
| return { | |
| ...context, | |
| x: boundingRect.x, | |
| y: boundingRect.y, | |
| dx: mouseEvent.clientX - boundingRect.x, | |
| dy: mouseEvent.clientY - boundingRect.y | |
| } | |
| }) | |
| } | |
| } | |
| }, | |
| dragging: { | |
| on: { | |
| mousemove: { | |
| target: 'dragging', | |
| actions: assign((context, mouseEvent) => { | |
| return { | |
| ...context, | |
| x: mouseEvent.clientX - context.dx, | |
| y: mouseEvent.clientY - context.dy | |
| } | |
| }) | |
| }, | |
| mouseup: { | |
| target: 'idle', | |
| } | |
| } | |
| } | |
| } | |
| }) | |
| const body = document.body; | |
| const box = document.getElementById('box') | |
| const dragDropService = interpret(dragDropMachine) | |
| .onTransition(state => { | |
| if (state.changed) { | |
| console.log(state.context) | |
| box.style.setProperty('left', state.context.x + 'px') | |
| box.style.setProperty('top', state.context.y + 'px') | |
| body.dataset.state = state.toStrings().join(' ') | |
| } | |
| }) | |
| .start(); | |
| box.addEventListener('mousedown', event => { | |
| dragDropService.send(event) | |
| }) | |
| body.addEventListener('mouseup', event => { | |
| dragDropService.send(event) | |
| }) | |
| body.addEventListener('mousemove', event => { | |
| dragDropService.send(event) | |
| }) |
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| * { | |
| position: relative; | |
| box-sizing: border-box; | |
| } | |
| body, | |
| html { | |
| height: 100%; | |
| width: 100%; | |
| margin: 0; | |
| padding: 0; | |
| } | |
| body::before { | |
| content: attr(data-state); | |
| font-size: 2rem; | |
| font-family: monospace; | |
| position: absolute; | |
| padding: 1rem; | |
| z-index: 99; | |
| right: 0; | |
| } | |
| body[data-state="dragging"] #box { | |
| background: red; | |
| } | |
| #box { | |
| height: 20vmin; | |
| width: 20vmin; | |
| background: #99ccff; | |
| border-radius: 1rem; | |
| } |
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