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import React, { Component } from 'react'
import { Link } from 'react-router-dom'
import { bindActionCreators } from 'redux'
import { connect } from 'react-redux'
import toBlob from 'data-uri-to-blob'
import { clamp } from 'app/utils'
import { Loader } from 'app/common'
const defaultState = {
dragging: false,
draggingBox: false,
bounds: null,
mouseX: 0,
mouseY: 0,
box: {
x: 0,
y: 0,
w: 0,
h: 0,
}
}
export default class ImageSelection extends Component {
state = {
...defaultState
}
constructor() {
super()
// bind these events in the constructor, so we can remove event listeners later
this.handleMouseDown = this.handleMouseDown.bind(this)
this.handleMouseDownOnBox = this.handleMouseDownOnBox.bind(this)
this.handleMouseMove = this.handleMouseMove.bind(this)
this.handleMouseUp = this.handleMouseUp.bind(this)
this.handleWindowResize = this.handleWindowResize.bind(this)
}
componentDidMount() {
document.body.addEventListener('mousemove', this.handleMouseMove)
document.body.addEventListener('mouseup', this.handleMouseUp)
window.addEventListener('resize', this.handleWindowResize)
}
componentDidUpdate(prevProps) {
if (this.state.bounds && this.props.url !== prevProps.url) {
this.setState({
...defaultState,
bounds: this.getBoundingClientRect(),
box: this.props.crop || defaultState.box,
})
}
}
componentWillUnmount() {
document.body.removeEventListener('mousemove', this.handleMouseMove)
document.body.removeEventListener('mouseup', this.handleMouseUp)
window.removeEventListener('resize', this.handleWindowResize)
}
getBoundingClientRect() {
if (!this.imgRef) return null
const rect = this.imgRef.getBoundingClientRect()
const scrollTop = document.body.scrollTop || document.body.parentNode.scrollTop
const scrollLeft = document.body.scrollLeft || document.body.parentNode.scrollLeft
const bounds = {
top: rect.top + scrollTop,
left: rect.left + scrollLeft,
width: rect.width,
height: rect.height,
}
return bounds
}
handleLoad() {
const bounds = this.getBoundingClientRect()
const box = this.props.crop || defaultState.box
this.setState({ bounds, box })
}
handleWindowResize() {
if (!this.imgRef) return
const bounds = this.getBoundingClientRect()
this.setState({ bounds })
}
handleMouseDown(e) {
e.preventDefault()
const bounds = this.getBoundingClientRect()
const mouseX = e.pageX
const mouseY = e.pageY
const x = (mouseX - bounds.left) / bounds.width
const y = (mouseY - bounds.top) / bounds.height
const w = 1 / bounds.width
const h = 1 / bounds.height
this.setState({
dragging: true,
bounds,
mouseX,
mouseY,
box: {
x, y, w, h,
}
})
}
handleMouseDownOnBox(e) {
const bounds = this.getBoundingClientRect()
const mouseX = e.pageX
const mouseY = e.pageY
this.setState({
draggingBox: true,
bounds,
mouseX,
mouseY,
initialBox: {
...this.state.box
},
box: {
...this.state.box
}
})
}
handleMouseMove(e) {
const {
dragging, draggingBox,
bounds, mouseX, mouseY, initialBox, box
} = this.state
if (dragging) {
e.preventDefault()
let { x, y } = box
let dx = (e.pageX - mouseX) / bounds.width
let dy = (e.pageY - mouseY) / bounds.height
let w = clamp(dx, 0.0, 1.0 - x)
let h = clamp(dy, 0.0, 1.0 - y)
this.setState({
box: {
x, y, w, h,
}
})
} else if (draggingBox) {
e.preventDefault()
let { x, y, w, h } = initialBox
let dx = (e.pageX - mouseX) / bounds.width
let dy = (e.pageY - mouseY) / bounds.height
this.setState({
box: {
x: clamp(x + dx, 0, 1.0 - w),
y: clamp(y + dy, 0, 1.0 - h),
w,
h,
}
})
}
}
handleMouseUp(e) {
const { onCrop } = this.props
const { dragging, draggingBox, bounds, box } = this.state
if (!dragging && !draggingBox) return
e.preventDefault()
const { x, y, w, h } = box
let url = window.location.pathname
this.setState({
dragging: false,
draggingBox: false,
})
if (w < 10 / bounds.width || h < 10 / bounds.height) {
this.setState({ box: { ...defaultState.box }})
onCrop({})
} else {
// pass the box dimensions up - do the search again
onCrop(box)
}
}
render() {
const { url } = this.props
const { bounds, box } = this.state
const { x, y, w, h } = box
return (
<div className="imageSelection">
<img
src={url}
ref={ref => this.imgRef = ref}
onMouseDown={this.handleMouseDown}
onLoad={this.handleLoad.bind(this)}
crossOrigin='anonymous'
/>
{!!w &&
<div
className="box"
style={{
left: x * bounds.width,
top: y * bounds.height,
width: w * bounds.width,
height: h * bounds.height,
}}
onMouseDown={this.handleMouseDownOnBox}
/>
}
</div>
)
}
}
const boxToFixed = ({ x, y, w, h }) => ({
x: x.toFixed(3),
y: y.toFixed(3),
w: w.toFixed(3),
h: h.toFixed(3),
})
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