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draggable.js
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176 lines (176 loc) · 8.69 KB
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/**
* (c) RM//Kesper
* MIT License
* - add class "draggable" to element and start via "(new TransformDraggable()).add()"
* - parent element is used for drag limitations
* - lock orientation bby adding "data-drag-x" or "data-drag-y" to element
*/
class TransformDraggable {
dragActive = false
dragEl = null
dragElPrnt = null
add () {
let self = this
document.body.classList.add("drag-added")
document.addEventListener("mousemove", function() { self.drag.call(self, event) } )
document.addEventListener("touchmove", function() { self.drag.call(self, event) } )
document.addEventListener("mouseup", function() { self.dragEnd.call(self) } )
document.addEventListener("touchend", function() { self.dragEnd.call(self) } )
document.addEventListener("touchstart", () => {
document.body.firstElementChild.classList.remove("overflow-y-auto")
document.body.firstElementChild.classList.remove("overflow-x-hidden")
if(!document.body.firstElementChild.classList.contains("overflow-hidden"))
document.body.firstElementChild.classList.add("overflow-hidden")
});
document.addEventListener("touchend", () => {
document.body.firstElementChild.classList.remove("overflow-hidden")
if(!document.body.firstElementChild.classList.contains("overflow-y-auto"))
document.body.firstElementChild.classList.add("overflow-y-auto")
if(!document.body.firstElementChild.classList.contains("overflow-x-hidden"))
document.body.firstElementChild.classList.add("overflow-x-hidden")
});
(new MutationObserver(function(mutations) {
let mutate = false;
for(let mutation of mutations)
if(mutation.oldValue !== mutation.target.textContent) {
mutate = true;
break;
}
if (mutate) self.addDrag();
})).observe(document.body, { characterDataOldValue: true, subtree: true, childList: true, characterData: true })
}
addDrag() {
let self = this
for(let e of document.querySelectorAll('.draggable')) {
if(!e.classList.contains("draggable-added")) {
e.classList.add("draggable-added")
if(!e.classList.contains("transform")) e.classList.add("transform")
e.addEventListener("mousedown", function() { self.dragStart.call(self, event, e, e.parentElement) }, false)
e.addEventListener("touchstart", function() { self.dragStart.call(self, event, e, e.parentElement) }, false)
}
}
}
dragStart(event, el, prnt){
if(!el.classList.contains("draggable")) return
if(el.getBoundingClientRect().width+15 >= prnt.getBoundingClientRect().width
|| el.getBoundingClientRect().height+15 >= prnt.getBoundingClientRect().height
) return
this.dragActive = true
this.dragEl = el
this.dragElPrnt = prnt
let startX = !!event.changedTouches ? event.changedTouches[0].clientX : event.clientX;
let startY = !!event.changedTouches ? event.changedTouches[0].clientY : event.clientY;
let _startX = this.dragEl.style.getPropertyValue("--tw-translate-x") ?? "0"
let _startY = this.dragEl.style.getPropertyValue("--tw-translate-y") ?? "0"
if(_startX.indexOf("em")>0) _startX = (parseInt(_startX) * 16).toString()
if(_startY.indexOf("em")>0) _startY = (parseInt(_startY) * 16).toString()
_startX = _startX === "" ? "0" : _startX
_startY = _startY === "" ? "0" : _startY
this.dragEl.setAttribute("data-drag-start-x", parseInt(_startX))
this.dragEl.setAttribute("data-drag-start-y", parseInt(_startY))
this.dragEl.setAttribute("data-drag-event-x", startX)
this.dragEl.setAttribute("data-drag-event-y", startY)
}
drag(event){
if(!this.dragActive || !this.dragEl || !this.dragElPrnt) return
if(!this.dragEl.classList.contains("draggable")) return
if(this.dragEl.getBoundingClientRect().width+15 >= this.dragElPrnt.getBoundingClientRect().width
|| this.dragEl.getBoundingClientRect().height+15 >= this.dragElPrnt.getBoundingClientRect().height
) return
let elRect = this.dragEl.getBoundingClientRect()
let pRect = this.dragElPrnt.getBoundingClientRect()
let allowX = !!this.dragEl.getAttribute("data-drag-x")
let allowY = !!this.dragEl.getAttribute("data-drag-y")
if(!allowX && !allowY) allowX = allowY = true
let dragStartX = parseInt(this.dragEl.getAttribute("data-drag-start-x"))
let dragStartY = parseInt(this.dragEl.getAttribute("data-drag-start-y"))
let dragEventX = parseInt(this.dragEl.getAttribute("data-drag-event-x"))
let dragEventY = parseInt(this.dragEl.getAttribute("data-drag-event-y"))
let thisDragX = !!event.changedTouches ? event.changedTouches[0].clientX : event.clientX;
let thisDragY = !!event.changedTouches ? event.changedTouches[0].clientY : event.clientY;
let posX = thisDragX - dragEventX + dragStartX
let posY = thisDragY - dragEventY + dragStartY
let mar = 10 // minimum margin for max position definitions
let off = 15 // set position outside the minimum margin so that we can still drag and not exceed the limitations
// move x and y
for(let i of [0,1]) {
let or = i === 0 ? "x" : "y"
let res = i === 0 ? "width" : "height"
let pos = i === 0 ? posX : posY
let allow = i === 0 ? allowX : allowY
if(allow) {
if( (elRect[or]+elRect[res] < pRect[or]+pRect[res]-mar && elRect[or] > pRect[or]+mar
&& this.dragEl.getAttribute("data-drag-min-"+or) === null
&& this.dragEl.getAttribute("data-drag-max-"+or) === null) ) {
this.dragEl.style.setProperty("--tw-translate-"+or, pos + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = pos
}
else if ( elRect[or] <= pRect[or]+mar && this.dragEl.getAttribute("data-drag-min-"+or) === null) {
if(this.dragEl.getAttribute("data-drag-min-"+or) === null) {
if(this.dragEl.getAttribute("data-drag-init-min-"+or) === null)
this.dragEl.setAttribute("data-drag-init-min-"+or, pos)
this.dragEl.setAttribute("data-drag-min-"+or, pos)
let max = this.dragEl.getAttribute("data-drag-min-"+or)
this.dragEl.style.setProperty("--tw-translate-"+or, (parseInt(max)+off) + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = (parseInt(max)+off)
}
}
else if( this.dragEl.getAttribute("data-drag-min-"+or) !== null ) {
if(pos-parseInt(this.dragEl.getAttribute("data-drag-min-"+or)) > 0) {
this.dragEl.style.setProperty("--tw-translate-"+or, pos + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = pos
this.dragEl.removeAttribute("data-drag-min-"+or)
} else if(elRect[or] <= pRect[or]+mar) {
let max = this.dragEl.getAttribute("data-drag-init-min-"+or)
this.dragEl.style.setProperty("--tw-translate-"+or, (parseInt(max)+off) + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = (parseInt(max)+off)
}
}
else if ( elRect[or]+elRect[res] >= pRect[or]+pRect[res]-mar && this.dragEl.getAttribute("data-drag-max-"+or) === null) {
if(this.dragEl.getAttribute("data-drag-max-"+or) === null) {
if(this.dragEl.getAttribute("data-drag-init-max-"+or) === null)
this.dragEl.setAttribute("data-drag-init-max-"+or, pos)
this.dragEl.setAttribute("data-drag-max-"+or, pos)
let max = this.dragEl.getAttribute("data-drag-max-"+or)
this.dragEl.style.setProperty("--tw-translate-"+or, (parseInt(max)-off) + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = (parseInt(max)-off)
}
}
else if( this.dragEl.getAttribute("data-drag-max-"+or) !== null ) {
if(pos-parseInt(this.dragEl.getAttribute("data-drag-max-"+or)) < 0) {
this.dragEl.style.setProperty("--tw-translate-"+or, pos + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = pos
this.dragEl.removeAttribute("data-drag-max-"+or)
} else if(elRect[or]+elRect[res] >= pRect[or]+pRect[res]-mar) {
let max = this.dragEl.getAttribute("data-drag-init-max-"+or)
this.dragEl.style.setProperty("--tw-translate-"+or, (parseInt(max)-off) + 'px')
if(this.dragEl.id) this[this.dragEl.id+or.toUpperCase()] = (parseInt(max)-off)
}
}
}
}
let rangeX = pRect.width - elRect.width - off*2
let rangeY = pRect.height - elRect.height - off*2
let crntX = elRect.x / rangeX
let crntY = elRect.y / rangeY
let prcX = Math.round(crntX * 100)
let prcY = Math.round(crntY * 100)
if(prcX < 4) prcX = 0
if(prcX > 96) prcX = 100
if(prcY < 4) prcY = 0
if(prcY > 96) prcY = 100
localStorage.setItem("DRAG_X%", prcX)
localStorage.setItem("DRAG_Y%", prcY)
}
dragEnd(){
if(this.dragEl) {
this.dragEl.removeAttribute("data-drag-start-x")
this.dragEl.removeAttribute("data-drag-start-y")
this.dragEl.removeAttribute("data-drag-event-x")
this.dragEl.removeAttribute("data-drag-event-y")
}
this.dragActive = false
this.dragEl = null
this.dragElPrnt = null
}
}