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day1029-drag-a-box.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta content="width=device-width, initial-scale=1.0" name="viewport" />
<title>Scratch</title>
<style>
:root {
font-size: 0.1vw;
}
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
html,
body {
height: 100%;
background-color: #888;
}
li {
list-style: none;
}
body {
display: flex;
justify-content: center;
align-items: center;
}
.box {
width: 250rem;
height: 125rem;
background-color: #eedc5b;
border-radius: 8rem;
cursor: move;
transition: opacity 300ms ease-in-out;
font-size: 64rem;
line-height: 125rem;
text-align: center;
user-select: none;
}
.box__what-if {
border: dashed 4px #5d6eee;
opacity: 0.5;
}
.box__drag-feedback {
z-index: 100;
transform-origin: center;
position: fixed;
box-shadow: 3px 3px 6px #222;
}
.box-wrap {
position: relative;
display: flex;
justify-content: center;
flex-wrap: wrap;
gap: 20rem;
/* adding 14rem is magic that makes each row has 3 boxes */
width: calc(250rem * 3 + 20rem * 2 + 20rem * 2 + 4rem * 2 + 14rem);
padding: 20rem;
border: solid 4px #5d6eee;
border-radius: 8px;
}
</style>
</head>
<body>
<ul class="box-wrap">
<li class="box">1</li>
<li class="box">2</li>
<li class="box">3</li>
<li class="box">4</li>
<li class="box">5</li>
<li class="box">6</li>
<li class="box">7</li>
<li class="box">8</li>
<li class="box">9</li>
<li class="box">10</li>
<li class="box">11</li>
<li class="box">12</li>
</ul>
<script>
const posBeforeDragStart = new Map();
function boxOnDragStart(box) {
return (e) => {
e.dataTransfer.setDragImage(document.createElement("div"), 0, 0);
const dragFeedback = box.cloneNode(true);
dragFeedback.classList.add("box__drag-feedback");
dragFeedback.style.transform = `translate(${-e.offsetX}px,${-e.offsetY}px) scale(1.1) rotateZ(10deg)`;
dragFeedback.style.transformOrigin = `${e.offsetX}px ${e.offsetY}px`;
dragFeedback.style.top = e.clientY + "px";
dragFeedback.style.left = e.clientX + "px";
// put drag feedback element below e.target, otherwise drag immediately ends
dragFeedback.style.zIndex = -1;
dragFeedback.dataset.dragFeedback = "";
oBoxWrap.appendChild(dragFeedback);
box.classList.add("box__what-if");
box.dataset.dragging = "";
aBox.forEach((box) => {
const pos = box.getBoundingClientRect();
posBeforeDragStart.set(box, {
x: pos.x + pos.width / 2,
y: pos.y + pos.height / 2,
});
});
};
}
function boxOnDragEnd(box) {
return () => {
box.classList.remove("box__what-if");
delete box.dataset.dragging;
document.querySelector("[data-drag-feedback]").remove();
};
}
function distance(x1, y1, x2, y2) {
return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
}
const aBox = Array.from(document.querySelectorAll(".box"));
const oBoxWrap = document.querySelector(".box-wrap");
aBox.forEach((box) => {
box.setAttribute("draggable", "true");
box.addEventListener("dragstart", boxOnDragStart(box));
box.addEventListener("dragend", boxOnDragEnd(box));
});
oBoxWrap.addEventListener("dragover", (e) => {
e.preventDefault();
e.dataTransfer.dropEffect = "move";
const beingDragged = oBoxWrap.querySelector(".box[data-dragging]");
const { insert: closest, center: pos } = Array.from(
posBeforeDragStart.entries(),
).reduce(
(ans, [other, center]) => {
const d = distance(e.clientX, e.clientY, center.x, center.y);
if (ans.distance > d) {
ans.insert = other;
ans.distance = d;
ans.center = center;
}
return ans;
},
{
insert: null,
distance: Infinity,
center: null,
},
);
if (closest !== null) {
let where;
if (pos.x >= e.clientX) {
where = "beforebegin";
} else {
where = "afterend";
}
console.log("insertAdjacentElement", where, closest.textContent);
closest.insertAdjacentElement(where, beingDragged);
}
const dragFeedBack = document.querySelector("[data-drag-feedback]");
dragFeedBack.style.zIndex = "";
dragFeedBack.style.top = `${e.clientY}px`;
dragFeedBack.style.left = `${e.clientX}px`;
});
</script>
</body>
</html>