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| import React from "react" | |
| import ReactDOM from "react-dom" | |
| class App extends React.PureComponent { | |
| state = { blocks: {} } | |
| handleDragStart = (e) => { | |
| // find block in blocks and set isDragging property to true | |
| const blockId = e.target.dataset.id | |
| const block = { ...this.state.blocks[blockId] } | |
| block.isDragging = true | |
| this.setState({ blocks: { ...this.state.blocks, [blockId]: block } }) | |
| } | |
| handleDragging = (e) => { | |
| // find block in blocks and if isDragging updating position | |
| const blockId = e.target.dataset.id | |
| const block = { ...this.state.blocks[blockId] } | |
| if (!block.isDragging) { | |
| return | |
| } | |
| block.left = e.clientX | |
| block.top = e.clientY | |
| this.setState({ blocks: { ...this.state.blocks, [blockId]: block } }) | |
| } | |
| handleDragEnd = (e) => { | |
| // find block in blocks, update position, and set isDragging back to false | |
| const blockId = e.target.dataset.id | |
| const block = { ...this.state.blocks[blockId] } | |
| block.left = e.clientX | |
| block.top = e.clientY | |
| // set isDragging to false for block | |
| block.isDragging = false | |
| this.setState({ blocks: { ...this.state.blocks, [blockId]: block } }) | |
| } | |
| render() { | |
| return ( | |
| <div style={{ display: "flex", flexDirection: "column", height: "100%" }}> | |
| <div> | |
| <button onClick={this.handleNewBlock}>new block</button> | |
| </div> | |
| <div style={{ display: "flex" }}> | |
| {Object.values(this.state.blocks).map( | |
| ({ id, height, width, left, top }) => ( | |
| <div | |
| key={id} | |
| data-id={id} | |
| draggable="true" | |
| onDragEnter={this.handleDragStart} | |
| onDrag={this.handleDragging} | |
| onDragEnd={this.handleDragEnd} | |
| style={{ | |
| position: "absolute", | |
| border: "1px solid black", | |
| height, | |
| width, | |
| left, | |
| top, | |
| }} | |
| /> | |
| ) | |
| )} | |
| </div> | |
| </div> | |
| ) | |
| } | |
| handleNewBlock = () => { | |
| const { blocks } = this.state | |
| const newBlock = { | |
| id: Math.random(), | |
| width: 100, | |
| height: 100, | |
| left: window.innerWidth / 2 - 50, | |
| top: window.innerHeight / 2 - 50, | |
| isDragging: false, | |
| } | |
| this.setState({ blocks: { ...blocks, [newBlock.id]: newBlock } }) | |
| } | |
| } | |
| ReactDOM.render(<App />, document.getElementById("root")) |
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