The facelift of the minimalistic DnD code from https://gist.github.com/uhop/d87365fac38ba6b8cbf0b890d0c2258e
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'use strict'; | |
// from https://gist.github.com/uhop/d87365fac38ba6b8cbf0b890d0c2258e | |
const noop = () => {}; | |
class DndMove { | |
static supportedEvents = { | |
pointerup: 'onPointerUp', | |
pointermove: 'onPointerMove', | |
touchstart: 'stopEvent', | |
touchmove: 'stopEvent', | |
dragstart: 'stopEvent', | |
selectstart: 'stopEvent' | |
}; | |
static formNode = {a: 1, input: 1, select: 1, button: 1, textarea: 1, option: 1}; | |
constructor(container, options, node, e) { | |
this.container = container; | |
this.options = options || {}; | |
this.node = node; | |
// handle the state | |
this.container.classList.add('dnd-dragged-container'); | |
this.node.ownerDocument.documentElement.classList.add('dnd-in-flight'); | |
this.node.classList.add('dnd-dragged'); | |
this.mouseX = e.pageX; | |
this.mouseY = e.pageY; | |
this.avatar = (this.options.makeAvatar || DndMove.clone)(this); | |
this.moving = this.options.moving || DndMove.moving; | |
this.over = this.options.over || noop; | |
this.newOver = this.options.newOver || noop; | |
// listen for events | |
Object.keys(DndMove.supportedEvents).forEach(name => { | |
if (name == 'selectstart') return this.node.ownerDocument.body.addEventListener(name, this); | |
this.node.ownerDocument.addEventListener(name, this, {passive: false}); | |
}); | |
(this.options.init || noop)(this); | |
} | |
destroy() { | |
// remove event listeners | |
Object.keys(DndMove.supportedEvents).forEach(name => { | |
if (name == 'selectstart') return this.node.ownerDocument.body.removeEventListener(name, this); | |
this.node.ownerDocument.removeEventListener(name, this); | |
}); | |
// handle the state | |
this.container.classList.remove('dnd-dragged-container'); | |
this.node.ownerDocument.documentElement.classList.remove('dnd-in-flight'); | |
this.node.classList.remove('dnd-dragged'); | |
if (this.previousOverItem) { | |
this.previousOverItem.classList.remove('dnd-over'); | |
} | |
(this.options.destroy || noop)(this); | |
} | |
calculateBoundingBoxes() { | |
const items = this.container.querySelectorAll(this.options.target || '.dnd-item'); | |
this.itemBoxes = Array.from(items).map(item => { | |
const rect = item.getBoundingClientRect(); | |
return { | |
node: item, | |
left: rect.left + window.pageXOffset, | |
right: rect.right + window.pageXOffset, | |
top: rect.top + window.pageYOffset, | |
bottom: rect.bottom + window.pageYOffset | |
}; | |
}); | |
} | |
// the starter | |
static start(container, options) { | |
options = options || {}; | |
const callback = DndMove.process(container, options), | |
filter = options.filter || '.dnd-handle', | |
handler = | |
typeof filter == 'function' ? e => filter(e) && callback(e) : e => e.target.closest(filter) && callback(e); | |
container.addEventListener('pointerdown', handler); | |
return { | |
container, | |
options, | |
remove: () => { | |
container.removeEventListener('pointerdown', handler); | |
} | |
}; | |
} | |
// events | |
handleEvent(e) { | |
this[DndMove.supportedEvents[e.type]](e); | |
} | |
onPointerUp(e) { | |
DndMove.stopEvent(e); | |
(this.options.drop || noop)(this); | |
this.avatar.parentNode.removeChild(this.avatar); | |
this.destroy(); | |
} | |
onPointerMove(e) { | |
DndMove.stopEvent(e); | |
this.moving(this, e); | |
this.mouseX = e.pageX; | |
this.mouseY = e.pageY; | |
this.avatar.style.left = this.x + 'px'; | |
this.avatar.style.top = this.y + 'px'; | |
this.over(this); | |
} | |
stopEvent(e) { | |
DndMove.stopEvent(e); | |
} | |
// helpers | |
static init(mover) { | |
// container box | |
let style = window.getComputedStyle(mover.container); | |
const rect = mover.container.getBoundingClientRect(), | |
box = { | |
left: rect.left + window.pageXOffset + parseFloat(style.borderLeftWidth), | |
right: rect.right + window.pageXOffset - parseFloat(style.borderRightWidth) - parseFloat(style.marginRight), | |
top: rect.top + window.pageYOffset + parseFloat(style.borderTopWidth), | |
bottom: rect.bottom + window.pageYOffset - parseFloat(style.borderBottomWidth) - parseFloat(style.marginBottom) | |
}; | |
style = window.getComputedStyle(mover.avatar); | |
box.left -= parseFloat(style.marginLeft); | |
box.right -= | |
parseFloat(style.marginLeft) + | |
parseFloat(style.borderLeftWidth) + | |
parseFloat(style.width) + | |
parseFloat(style.borderRightWidth); | |
box.top -= parseFloat(style.marginTop); | |
box.bottom -= | |
parseFloat(style.marginTop) + | |
parseFloat(style.borderTopWidth) + | |
parseFloat(style.height) + | |
parseFloat(style.borderBottomWidth); | |
mover.containerBox = box; | |
mover.calculateBoundingBoxes(); | |
} | |
static over(mover) { | |
// binary search is better, but linear will do in a pinch | |
const done = mover.itemBoxes.some(item => { | |
if ( | |
item.left <= mover.mouseX && | |
mover.mouseX < item.right && | |
item.top <= mover.mouseY && | |
mover.mouseY < item.bottom | |
) { | |
if (item.node !== mover.previousOverItem) { | |
mover.previousOverItem && mover.previousOverItem.classList.remove('dnd-over'); | |
mover.previousOverItem = item.node; | |
mover.previousOverItem.classList.add('dnd-over'); | |
mover.newOver(mover); | |
} | |
return true; | |
} | |
return false; | |
}); | |
if (!done && mover.previousOverItem) { | |
mover.previousOverItem && mover.previousOverItem.classList.remove('dnd-over'); | |
mover.previousOverItem = null; | |
mover.newOver(mover); | |
} | |
} | |
static movingX(mover, e) { | |
mover.x += e.pageX - mover.mouseX; | |
mover.x = Math.max(mover.containerBox.left, Math.min(mover.containerBox.right, mover.x)); | |
} | |
static movingY(mover, e) { | |
mover.y += e.pageY - mover.mouseY; | |
mover.y = Math.max(mover.containerBox.top, Math.min(mover.containerBox.bottom, mover.y)); | |
} | |
static moving(mover, e) { | |
mover.x += e.pageX - mover.mouseX; | |
mover.x = Math.max(mover.containerBox.left, Math.min(mover.containerBox.right, mover.x)); | |
mover.y += e.pageY - mover.mouseY; | |
mover.y = Math.max(mover.containerBox.top, Math.min(mover.containerBox.bottom, mover.y)); | |
} | |
static dropX(mover) { | |
if (!mover.previousOverItem) return; | |
// binary search is better, but linear will do in a pinch | |
const done = mover.itemBoxes.some(item => { | |
if (mover.mouseX < (item.left + item.right) / 2) { | |
item.node !== mover.node && mover.container.insertBefore(mover.node, item.node); | |
return true; | |
} | |
return false; | |
}); | |
!done && mover.container.appendChild(mover.node); | |
} | |
static dropY(mover) { | |
if (!mover.previousOverItem) return; | |
// binary search is better, but linear will do in a pinch | |
const done = mover.itemBoxes.some(item => { | |
if (mover.mouseY < (item.top + item.bottom) / 2) { | |
item.node !== mover.node && mover.container.insertBefore(mover.node, item.node); | |
return true; | |
} | |
return false; | |
}); | |
!done && mover.container.appendChild(mover.node); | |
} | |
// statics | |
static process(container, options) { | |
return e => { | |
const node = e.target; | |
if (!e.button && DndMove.formNode[node.tagName.toLowerCase()] !== 1 && !node.classList.contains('dnd-ignore')) { | |
const item = node.closest('.dnd-item'); | |
if (item && !item.classList.contains('dnd-ignore')) { | |
// if ( | |
// typeof node.hasPointerCapture == 'function' && | |
// node.hasPointerCapture(e.pointerId) && | |
// typeof node.releasePointerCapture == 'function' | |
// ) { | |
// node.releasePointerCapture(e.pointerId); | |
// } | |
e.preventDefault(); | |
new DndMove(container, options, item, e); | |
} | |
} | |
}; | |
} | |
static clone(mover) { | |
const node = mover.node, | |
box = node.getBoundingClientRect(), | |
style = window.getComputedStyle(node), | |
avatar = node.cloneNode(true); | |
mover.x = box.left - parseFloat(style.marginLeft) + window.pageXOffset; | |
mover.y = box.top - parseFloat(style.marginTop) + window.pageYOffset; | |
avatar.style.position = 'absolute'; | |
avatar.style.height = style.height; | |
avatar.style.width = style.width; | |
avatar.style.left = mover.x + 'px'; | |
avatar.style.top = mover.y + 'px'; | |
avatar.classList.remove('dnd-dragged'); | |
avatar.classList.add(mover.options.avatarClass || 'dnd-avatar'); | |
node.ownerDocument.body.appendChild(avatar); | |
return avatar; | |
} | |
static stopEvent(e) { | |
e.preventDefault(); | |
e.stopPropagation(); | |
} | |
} | |
export default DndMove; |
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The differences with https://gist.github.com/uhop/d87365fac38ba6b8cbf0b890d0c2258e are minor: