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function MultiDrag() {
this.del = false;
this.drag = [];
window.addEventListener("mousemove", this.update.bind(this));
document.body.addEventListener("mouseleave", this.stopDraggingAll.bind(this));
}
MultiDrag.prototype = {
addDragEl: function(el, ox, oy, px, py, pt) {
if(this.del)
return;
el.style.transitionDuration = "0.04s";
this.drag.push({
e: el,
osx: ox,
osy: oy,
prx: px,
pry: py,
ptd: pt
});
return this.drag.length - 1;
},
dragging: function(e) {
for(let i in this.drag) {
if(this.drag[i].e == e)
return true;
}
return false;
},
startDragging: function(e) {
if(this.del)
return;
console.log(e);
if(e.button != 0)
return;
let pos
if(e.target.parentElement != null)
pos = e.target.parentElement.getBoundingClientRect();
else
pos = e.target.getBoundingClientRect();
return this.addDragEl(
e.target,
e.pageX,
e.pageY,
e.target.style.left,
e.target.style.top,
e.target.style.transitionDuration
);
},
stopDragging: function(i) {
this.del = true;
if (i < 0 || i >= this.drag.length)
return;
this.drag[i].e.style.transitionDuration = this.drag[i].ptd;
this.drag[i].e.style.left = this.drag[i].prx;
this.drag[i].e.style.top = this.drag[i].pry;
this.drag.splice(i, 1);
this.del = false;
},
stopDraggingAll: function() {
this.del = true;
while (this.drag.length > 0) {
this.drag[0].e.style.transitionDuration = this.drag[0].ptd;
this.drag[0].e.style.left = this.drag[0].prx;
this.drag[0].e.style.top = this.drag[0].pry;
this.drag.shift();
}
this.del = false;
},
update: function(e) {
for (let i = 0; i < this.drag.length && !this.del; i++) {
this.drag[i].e.style.left = e.pageX - this.drag[i].osx + "px";
this.drag[i].e.style.top = e.pageY - this.drag[i].osy + "px";
}
}
};
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