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index.js
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index.js
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import React, { Component } from 'react';
import './App.css';
import ReactDOM from 'react-dom'
class ImageUploader extends Component {
render() {
return (
<form className="image-upload-form" method="post" encType="multipart/form-data" >
<input type="file" name="inputOfFile" ref="imgInput" id="imgInput" onChange={this.props.handleImgChange}/>
<button onClick={this.props.getCropData}>获取裁剪参数</button>
</form>
)
}
}
class Cropper extends Component {
constructor() {
super()
this.state = {
imageValue: null
}
}
handleImgChange = e => {
let fileReader = new FileReader()
fileReader.readAsDataURL(e.target.files[0])
fileReader.onload = e => {
this.setState({...this.state, imageValue: e.target.result})
}
}
setSize = () => {
let img = this.refs.img
let widthNum = parseInt(this.props.width, 10)
let heightNum = parseInt(this.props.height, 10)
this.setState({
...this.state,
naturalSize: {
width: img.naturalWidth,
height: img.naturalHeight
}
})
let imgStyle = img.style
imgStyle.height = 'auto'
imgStyle.width = 'auto'
let principalStyle = ReactDOM.findDOMNode(this.refs.selectArea).parentElement.style
const ratio = img.width / img.height
// 设置图片大小、位置
if (img.width > img.height) {
imgStyle.width = principalStyle.width = this.props.width
imgStyle.height = principalStyle.height = widthNum / ratio + 'px'
principalStyle.marginTop = (widthNum - parseInt(principalStyle.height, 10)) / 2 + 'px'
principalStyle.marginLeft = 0
} else {
imgStyle.height = principalStyle.height = this.props.height
imgStyle.width = principalStyle.width = heightNum * ratio + 'px'
principalStyle.marginLeft = (heightNum - parseInt(principalStyle.width, 10)) / 2 + 'px'
principalStyle.marginTop = 0
}
// 设置选择框样式
let selectAreaStyle = ReactDOM.findDOMNode(this.refs.selectArea).style
let principalHeight = parseInt(principalStyle.height, 10)
let principalWidth = parseInt(principalStyle.width, 10)
if (principalWidth > principalHeight) {
selectAreaStyle.top = principalHeight * 0.1 + 'px'
selectAreaStyle.width = selectAreaStyle.height = principalHeight * 0.8 + 'px'
selectAreaStyle.left = (principalWidth - parseInt(selectAreaStyle.width, 10)) / 2 + 'px'
} else {
selectAreaStyle.left = principalWidth * 0.1 + 'px'
selectAreaStyle.width = selectAreaStyle.height = principalWidth * 0.8 + 'px'
selectAreaStyle.top = (principalHeight - parseInt(selectAreaStyle.height, 10)) / 2 + 'px'
}
}
getCropData = e => {
e.preventDefault()
let SelectArea = ReactDOM.findDOMNode(this.refs.selectArea).style
let a = {
width: parseInt(SelectArea.width, 10),
height: parseInt(SelectArea.height, 10),
left: parseInt(SelectArea.left, 10),
top: parseInt(SelectArea.top, 10)
}
a.radio = this.state.naturalSize.width / a.width
console.log(a)
return a
}
render() {
return (
<div>
<ImageUploader handleImgChange={this.handleImgChange} getCropData={this.getCropData}/>
<div className="image-principal">
<img src={this.state.imageValue} alt="" className="img" ref="img" onLoad={this.setSize}/>
<SelectArea ref="selectArea"></SelectArea>
</div>
</div>
)
}
}
class SelectArea extends Component {
constructor () {
super()
this.state = {
selectArea: null,
el: null,
container: null,
resizeArea: null
}
}
componentDidMount() {
this.moveBind = this.move.bind(this)
this.stopBind = this.stop.bind(this)
const container = ReactDOM.findDOMNode(this.refs.selectArea).parentElement
this.setState({...this.state, container})
}
dragStart = e => {
const el = e.target
const container = this.state.container
let selectArea = {
posLeft: e.clientX,
posTop: e.clientY,
left: e.clientX - el.offsetLeft,
top: e.clientY - el.offsetTop,
maxMoveX: container.offsetWidth - el.offsetWidth,
maxMoveY: container.offsetHeight - el.offsetHeight,
}
this.setState({ ...this.state, selectArea, el})
document.addEventListener('mousemove', this.moveBind, false)
document.addEventListener('mouseup', this.stopBind, false)
}
move(e) {
if (!this.state || !this.state.el || !this.state.selectArea) {
return
}
let selectArea = this.state.selectArea
let newPosLeft = e.clientX- selectArea.left
let newPosTop = e.clientY - selectArea.top
// 控制移动范围
if (newPosLeft <= 0) {
newPosLeft = 0
} else if (newPosLeft > selectArea.maxMoveX) {
newPosLeft = selectArea.maxMoveX
}
if (newPosTop <= 0) {
newPosTop = 0
} else if (newPosTop > selectArea.maxMoveY) {
newPosTop = selectArea.maxMoveY
}
let elStyle = this.state.el.style
elStyle.left = newPosLeft + 'px'
elStyle.top = newPosTop + 'px'
}
resize(type, e) {
if (!this.state || !this.state.el || !this.state.resizeArea) {
return
}
let container = this.state.container
const containerHeight = container.offsetHeight
const containerWidth = container.offsetWidth
const containerLeft = parseInt(container.style.left || 0, 10)
const containerTop = parseInt(container.style.top || 0, 10)
let resizeArea = this.state.resizeArea
let el = this.state.el
let elStyle = el.style
if (type === 'right' || type === 'bottom') {
let length
if (type === 'right') {
length = resizeArea.width + e.clientX - resizeArea.posLeft
} else {
length = resizeArea.height + e.clientY - resizeArea.posTop
}
if (parseInt(el.style.left, 10) + length > containerWidth || parseInt(el.style.top, 10) + length > containerHeight) {
const w = containerWidth - parseInt(el.style.left, 10)
const h = containerHeight - parseInt(el.style.top, 10)
elStyle.width = elStyle.height = Math.min(w, h) + 'px'
} else {
elStyle.width = length + 'px'
elStyle.height = length + 'px'
}
} else {
let posChange
let newPosLeft
let newPosTop
if (type === 'left') {
posChange = resizeArea.posLeft - e.clientX
} else {
posChange = resizeArea.posTop - e.clientY
}
newPosLeft = resizeArea.left - posChange
// 防止过度缩小
if (newPosLeft > resizeArea.left + resizeArea.width) {
elStyle.left = resizeArea.left + resizeArea.width + 'px'
elStyle.top = resizeArea.top + resizeArea.height + 'px'
elStyle.width = elStyle.height = '2px'
return
}
newPosTop = resizeArea.top - posChange
// 到达边界
if (newPosLeft <= containerLeft || newPosTop < containerTop) {
// 让选择框到图片最左边
let newPosLeft2 = resizeArea.left -containerLeft
// 判断顶部会不会超出边界
if (newPosLeft2 < resizeArea.top) {
// 未超出边界
elStyle.top = resizeArea.top - newPosLeft2 + 'px'
elStyle.left = containerLeft + 'px'
} else {
// 让选择框到达图片顶部
elStyle.top = containerTop + 'px'
elStyle.left = resizeArea.left + containerTop - resizeArea.top + 'px'
}
} else {
if (newPosLeft < 0) {
elStyle.left = 0;
elStyle.width = Math.min(resizeArea.width + posChange - newPosLeft, containerWidth) + 'px'
elStyle.top = newPosTop - newPosLeft;
elStyle.height = Math.min(resizeArea.height + posChange - newPosLeft, containerHeight) + 'px'
return;
}
if (newPosTop < 0) {
elStyle.left = newPosLeft - newPosTop;
elStyle.width = Math.min(resizeArea.width + posChange - newPosTop, containerWidth) + 'px'
elStyle.top = 0;
elStyle.height = Math.min(resizeArea.height + posChange - newPosTop, containerHeight) + 'px'
return;
}
elStyle.left = newPosLeft + 'px'
elStyle.top = newPosTop + 'px'
elStyle.width = resizeArea.width + posChange + 'px'
elStyle.height = resizeArea.height + posChange + 'px'
}
}
}
stop() {
document.removeEventListener('mousemove', this.moveBind , false)
document.removeEventListener('mousemove', this.resizeBind , false)
document.removeEventListener('mouseup', this.stopBind, false)
this.setState({...this.state, el: null, resizeArea: null, selectArea: null})
}
componentWillUnmount() {
this.stop()
}
resizeStart = (e, type) => {
e.stopPropagation()
const el = e.target.parentElement
let resizeArea = {
posLeft: e.clientX,
posTop: e.clientY,
width: el.offsetWidth,
height: el.offsetHeight,
left: parseInt(el.style.left, 10),
top: parseInt(el.style.top, 10)
}
this.setState({ ...this.state, resizeArea, el})
this.resizeBind = this.resize.bind(this, type)
document.addEventListener('mousemove', this.resizeBind, false)
document.addEventListener('mouseup', this.stopBind, false)
}
render() {
return (
<div className="select-area" onMouseDown={ this.dragStart} ref="selectArea" >
<div className="top-resize" onMouseDown={ event => this.resizeStart(event, 'top')}></div>
<div className="right-resize" onMouseDown={ event => this.resizeStart(event, 'right')}></div>
<div className="bottom-resize" onMouseDown={ event => this.resizeStart(event, 'bottom')}></div>
<div className="left-resize" onMouseDown={ event => this.resizeStart(event, 'left')}></div>
<div className="right-bottom-resize" onMouseDown={ event => this.resizeStart(event, 'right')}></div>
<div className="left-top-resize" onMouseDown={ event => this.resizeStart(event, 'left')}></div>
</div>
)
}
}
ReactDOM.render((
<Cropper width="200px" height="200px"/>
), document.getElementById('root'))