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import React, { useEffect, useRef, useState } from 'react'
import { PigeonProps, Point } from '../types'
function isDescendentOf(element, ancestor) {
while (element) {
if (element === ancestor) {
return true
}
element = element.parentElement
}
return false
}
interface DraggableProps extends PigeonProps {
className?: string
style?: React.CSSProperties
children?: React.ReactNode
onDragStart?: (anchor: Point) => void
onDragMove?: (anchor: Point) => void
onDragEnd?: (anchor: Point) => void
}
interface DraggableState {
isDragging: boolean
startX?: number
startY?: number
startLeft?: number
startTop?: number
deltaX: number
deltaY: number
}
const defaultState: DraggableState = {
isDragging: false,
startX: undefined,
startY: undefined,
startLeft: undefined,
startTop: undefined,
deltaX: 0,
deltaY: 0,
}
export function Draggable(props: DraggableProps): JSX.Element {
const dragRef = useRef<HTMLDivElement>()
const propsRef = useRef<DraggableProps>(props)
const stateRef = useRef({ ...defaultState })
const [_state, _setState] = useState(defaultState)
propsRef.current = props
const setState = (stateUpdate: Partial<DraggableState>): void => {
const newState = { ...stateRef.current, ...stateUpdate }
stateRef.current = newState
_setState(newState)
}
const { mouseEvents, touchEvents } = props.mapProps
useEffect(() => {
const handleDragStart = (event: MouseEvent | TouchEvent) => {
if (isDescendentOf(event.target, dragRef.current)) {
event.preventDefault()
setState({
isDragging: true,
startX: ('touches' in event ? event.touches[0] : event).clientX,
startY: ('touches' in event ? event.touches[0] : event).clientY,
startLeft: propsRef.current.left,
startTop: propsRef.current.top,
deltaX: 0,
deltaY: 0,
})
if (propsRef.current.onDragStart) {
const { left, top, offset, pixelToLatLng } = propsRef.current
propsRef.current.onDragMove(pixelToLatLng([left + (offset ? offset[0] : 0), top + (offset ? offset[1] : 0)]))
}
}
}
const handleDragMove = (event: MouseEvent | TouchEvent) => {
if (!stateRef.current.isDragging) {
return
}
event.preventDefault()
const x = ('touches' in event ? event.touches[0] : event).clientX
const y = ('touches' in event ? event.touches[0] : event).clientY
const deltaX = x - stateRef.current.startX
const deltaY = y - stateRef.current.startY
setState({ deltaX, deltaY })
if (propsRef.current.onDragMove) {
const { offset, pixelToLatLng } = propsRef.current
const { startLeft, startTop } = stateRef.current
propsRef.current.onDragMove(
pixelToLatLng([startLeft + deltaX + (offset ? offset[0] : 0), startTop + deltaY + (offset ? offset[1] : 0)])
)
}
}
const handleDragEnd = (event: MouseEvent | TouchEvent) => {
if (!stateRef.current.isDragging) {
return
}
event.preventDefault()
const { offset, pixelToLatLng } = propsRef.current
const { deltaX, deltaY, startLeft, startTop } = stateRef.current
propsRef.current.onDragEnd?.(
pixelToLatLng([startLeft + deltaX + (offset ? offset[0] : 0), startTop + deltaY + (offset ? offset[1] : 0)])
)
setState({
isDragging: false,
startX: undefined,
startY: undefined,
startLeft: undefined,
startTop: undefined,
deltaX: 0,
deltaY: 0,
})
}
const wa = (e: string, t: EventListener, o?: AddEventListenerOptions) => window.addEventListener(e, t, o)
const wr = (e: string, t: EventListener) => window.removeEventListener(e, t)
if (mouseEvents) {
wa('mousedown', handleDragStart)
wa('mousemove', handleDragMove)
wa('mouseup', handleDragEnd)
}
if (touchEvents) {
wa('touchstart', handleDragStart, { passive: false })
wa('touchmove', handleDragMove, { passive: false })
wa('touchend', handleDragEnd, { passive: false })
}
return () => {
if (mouseEvents) {
wr('mousedown', handleDragStart)
wr('mousemove', handleDragMove)
wr('mouseup', handleDragEnd)
}
if (touchEvents) {
wr('touchstart', handleDragStart)
wr('touchmove', handleDragMove)
wr('touchend', handleDragEnd)
}
}
}, [mouseEvents, touchEvents])
const { left, top, className, style } = props
const { deltaX, deltaY, startLeft, startTop, isDragging } = _state
return (
<div
style={{
cursor: isDragging ? 'grabbing' : 'grab',
...(style || {}),
position: 'absolute',
transform: `translate(${isDragging ? startLeft + deltaX : left}px, ${isDragging ? startTop + deltaY : top}px)`,
}}
ref={dragRef}
className={`pigeon-drag-block${className ? ` ${className}` : ''}`}
>
{props.children}
</div>
)
}
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