hydrogen-web/prototypes/menu-relative.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
body {
margin: 0;
padding: 0;
height: 100%;
overflow: hidden;
}
.container {
display: grid;
grid-template: "left middle" 1fr /
200px 1fr;
height: 100vh;
}
.container .left {
display: grid;
grid-template:
"welcome" auto
"rooms" 1fr /
1fr;
min-height: 0;
}
.container .middle {
display: grid;
grid-template:
"header" auto
"timeline" 1fr
"composer" auto /
1fr;
min-height: 0;
position: relative;
}
.left { grid-area: left;}
.left p {
grid-area welcome;
display: flex;
}
.left ul {
grid-area: rooms;
min-height: 0;
overflow-y: auto;
}
.middle { grid-area: middle;}
.middle .header { grid-area: header;}
.middle .timeline {
grid-area: timeline;
min-height: 0;
overflow-y: auto;
}
.middle .composer {
grid-area: composer;
}
.header {
display: flex;
}
.header h2 {
flex: 1;
}
.composer {
display: flex;
}
.composer input {
display: block;
flex: 1;
}
.menu {
position: absolute;
border-radius: 8px;
box-shadow: 2px 2px 10px rgba(0,0,0,0.5);
padding: 16px;
background-color: white;
z-index: 1;
list-style: none;
margin: 0;
}
</style>
</head>
<body>
<div class="container">
<div class="left">
<p>Welcome!<button></button></p>
<ul>
<li>Room xyz <button></button></li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz <button></button></li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz</li>
<li>Room xyz <button></button></li>
</ul>
</div>
<div class="middle">
<div class="header">
<h2>Room xyz</h2>
<button></button>
</div>
<ul class="timeline">
<li>Message abc</li>
<li>Message abc <button></button></li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc <button></button></li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc</li>
<li>Message abc <button></button></li>
</ul>
<div class="composer">
<input type="text" name="">
<button></button>
</div>
</div>
</div>
<script type="text/javascript">
let menu;
function createMenu(options) {
const menu = document.createElement("ul");
menu.className = "menu";
for (const o of options) {
const li = document.createElement("li");
li.innerText = o;
menu.appendChild(li);
}
return menu;
}
function showMenu(evt) {
if (menu) {
menu = menu.close();
} else if (evt.target.tagName.toLowerCase() === "button") {
menu = showPopup(evt.target, createMenu(["Send file", "Save contact", "Send picture", "Foo the bar"]), {
horizontal: {
relativeTo: "end",
align: "start",
after: 0,
},
vertical: {
relativeTo: "end",
align: "end",
after: 10,
}
});
}
}
function showMenuInScroller(evt) {
if (!menu && evt.target.tagName.toLowerCase() === "button") {
evt.stopPropagation();
menu = showPopup(evt.target, createMenu(["Show reactions", "Share"]), {
horizontal: {
relativeTo: "start",
align: "end",
after: 10,
},
vertical: {
relativeTo: "start",
align: "center",
}
});
}
}
document.body.addEventListener("click", showMenu, false);
document.querySelector(".middle ul").addEventListener("click", showMenuInScroller, false);
document.querySelector(".left ul").addEventListener("click", showMenuInScroller, false);
function showPopup(target, popup, arrangement) {
targetAxes = elementToAxes(target);
if (!arrangement) {
arrangement = getAutoArrangement(targetAxes);
}
target.offsetParent.appendChild(popup);
const popupAxes = elementToAxes(popup);
const scrollerAxes = elementToAxes(findScrollParent(target));
const offsetParentAxes = elementToAxes(target.offsetParent);
function reposition() {
if (scrollerAxes && !isVisibleInScrollParent(targetAxes.vertical, scrollerAxes.vertical)) {
popupObj.close();
}
applyArrangement(
popupAxes.vertical,
targetAxes.vertical,
offsetParentAxes.vertical,
scrollerAxes?.vertical,
arrangement.vertical
);
applyArrangement(
popupAxes.horizontal,
targetAxes.horizontal,
offsetParentAxes.horizontal,
scrollerAxes?.horizontal,
arrangement.horizontal
);
}
reposition();
document.body.addEventListener("scroll", reposition, true);
const popupObj = {
close() {
document.body.removeEventListener("scroll", reposition, true);
popup.remove();
}
};
return popupObj;
}
function elementToAxes(element) {
if (element) {
return {
horizontal: new HorizontalAxis(element),
vertical: new VerticalAxis(element),
element
};
}
}
function findScrollParent(el) {
let parent = el;
do {
parent = parent.parentElement;
if (parent.scrollHeight > parent.clientHeight) {
return parent;
}
} while (parent !== el.offsetParent);
}
function isVisibleInScrollParent(targetAxis, scrollerAxis) {
// clipped at start?
if ((targetAxis.offsetStart + targetAxis.clientSize) < (
scrollerAxis.offsetStart +
scrollerAxis.scrollOffset
)) {
return false;
}
// clipped at end?
if (targetAxis.offsetStart > (
scrollerAxis.offsetStart +
scrollerAxis.clientSize +
scrollerAxis.scrollOffset
)) {
return false;
}
return true;
}
function applyArrangement(elAxis, targetAxis, offsetParentAxis, scrollerAxis, {relativeTo, align, before, after}) {
if (relativeTo === "end") {
let end = offsetParentAxis.clientSize - targetAxis.offsetStart;
if (align === "end") {
end -= elAxis.offsetSize;
} else if (align === "center") {
end -= ((elAxis.offsetSize / 2) - (targetAxis.offsetSize / 2));
}
if (typeof before === "number") {
end += before;
} else if (typeof after === "number") {
end -= (targetAxis.offsetSize + after);
}
elAxis.end = end;
} else if (relativeTo === "start") {
let scrollOffset = scrollerAxis?.scrollOffset || 0;
let start = targetAxis.offsetStart - scrollOffset;
if (align === "start") {
start -= elAxis.offsetSize;
} else if (align === "center") {
start -= ((elAxis.offsetSize / 2) - (targetAxis.offsetSize / 2));
}
if (typeof before === "number") {
start -= before;
} else if (typeof after === "number") {
start += (targetAxis.offsetSize + after);
}
elAxis.start = start;
} else {
throw new Error("unknown relativeTo: " + relativeTo);
}
}
class HorizontalAxis {
constructor(el) {
this.element = el;
}
get scrollOffset() {return this.element.scrollLeft;}
get clientSize() {return this.element.clientWidth;}
get offsetSize() {return this.element.offsetWidth;}
get offsetStart() {return this.element.offsetLeft;}
set start(value) {this.element.style.left = `${value}px`;}
set end(value) {this.element.style.right = `${value}px`;}
}
class VerticalAxis {
constructor(el) {
this.element = el;
}
get scrollOffset() {return this.element.scrollTop;}
get clientSize() {return this.element.clientHeight;}
get offsetSize() {return this.element.offsetHeight;}
get offsetStart() {return this.element.offsetTop;}
set start(value) {this.element.style.top = `${value}px`;}
set end(value) {this.element.style.bottom = `${value}px`;}
}
</script>
</body>
</html>