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demo.html
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demo.html
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<!doctype html>
<head>
<title>Map tiles and a canvas</title>
<style>
/* * {
box-sizing: border-box;
}*/
.resize {
border: 20px solid rgba(0,255,0, 0.5);
background-color: #DDD;
width: 300.49px;
height: 200.5px;
overflow: hidden;
position:relative;
display:inline-block;
}
.yellowBorder {
border-width: 1px;
border-style: solid;
}
.maptiles {
overflow:
}
.maptiles::after {
content: "map tiles";
position: relative;
top: 20px;
}
.elipse {
border: 20px solid rgba(100,255,100, 0.5);
}
.elipse::after {
content: "canvas";
position: relative;
top: -100px;
}
.domMunch {
background-color: orange;
}
.domMunch > div {
display: inline-block;
width: 20px;
height: 20px;
border: 1px solid black;
}
.domMunch::after {
content: "domMunch";
position: relative;
top: 20px;
}
</style>
<script>
'use strict';
function log(msg) { var e = document.querySelector('#log'); e.textContent = e.innerText + '\n' + msg;}
window.onerror = function(event) {
log("global error" + event.message);
};
if (!window.ResizeObserver)
log('no document.ResizeObserver');
var range = 1.5;
function setRange() {
range = Math.max(0.5, parseInt(document.querySelector('#rangeInput').value));
}
function grow() {
for (var el of document.querySelectorAll('.resize')) {
let s = window.getComputedStyle(el);
let w = parseFloat(s.width);
let h = parseFloat(s.height);
el.style.width = (w + range) + 'px';
el.style.height = (h + range * 2 / 3) + 'px';
}
}
function shrink() {
for (var el of document.querySelectorAll('.resize')) {
let s = window.getComputedStyle(el);
let w = parseFloat(s.width);
let h = parseFloat(s.height);
el.style.width = (w - range) + 'px';
el.style.height = (h - range * 2 / 3) + 'px';
}
}
function move() {
var moveCount = 60;
var el = document.querySelector('.maptiles');
el.style.position = "absolute";
console.time("move");
var moveHelper = _ => {
if (moveCount-- == 0) {
el.style.top = "";
el.style.left = "";
el.style.position = "relative";
el.style.zIndex = "";
console.timeEnd("move");
} else {
el.style.zIndex = 1;
el.style.top = (parseFloat(el.style.top) + range || 0) + 'px';
el.style.left = (parseFloat(el.style.left) + range || 0) + 'px';
window.requestAnimationFrame(moveHelper);
}
}
window.setTimeout(moveHelper, 0);
}
</script>
</head>
<body>
<h1 style="display:none">ResizeObserver unexpected error</h1>
<pre id='log' style="display:none">log:
</pre>
<pre style="position:absolute; right: 0px">
Notify:<span id="notifyCount"></span>
</pre>
<p>
<label><input id="observe" type="checkbox" onclick="toggleObserve()">observe</label>
<button onclick="disconnect()">disconnect</button>
<button onclick="removeTargets()">remove</button>
<button onclick="addTargets()">add</button>
</p>
<p>
<button onclick="grow()">grow</button>
<button onclick="shrink()">shrink</button>
<button onclick="move()">move</button>
<label>size increment:<input type="number" id="rangeInput" min="1" max="40"></label>
</p>
<p>#maptiles places tiles inside an </p>
<p>#elipse draws an elipse in a canvas</p>
<div class="resize maptiles" ></div>
<canvas class="resize elipse"></canvas>
<div class="resize domMunch"></div>
<script>
'use strict';
var ro;
try {
ro = new ResizeObserver( entries => {
// console.log("resized");
document.querySelector("#notifyCount").innerText = entries.length;
for (let entry of entries) {
if (!entry.target || !entry.target.parentNode)
console.error("detected resize on removed element");
if (entry.target.onresize)
entry.target.onresize(entry);
}
});
}
catch(ex) {
log("Exception:" + ex.message);
console.error(ex.message);
}
// ACTIONS
var isObserving = false;
function toggleObserve() {
if (isObserving) {
isObserving = false;
for (let el of document.querySelectorAll('.resize'))
ro.unobserve(el);
}
else {
isObserving = true;
for (let el of document.querySelectorAll('.resize'))
ro.observe(el);
}
document.querySelector('#observe').checked = isObserving;
}
function disconnect() {
isObserving = false;
ro.disconnect();
document.querySelector('#observe').checked = isObserving;
}
function removeTargets() {
for (let el of document.querySelectorAll('.resize'))
el.parentNode.removeChild(el);
}
function addTargets() {
let nines = document.createElement('div');
nines.classList.add('resize');
nines.classList.add('maptiles');
document.body.appendChild(nines);
let elipse = document.createElement('canvas');
elipse.classList.add('resize');
elipse.classList.add('elipse');
document.body.appendChild(elipse);
initResizeHandlers();
toggleObserve();
toggleObserve(); // intentional, reverts to original.
}
// DRAWING
function nextColor() {
if (!nextColor.colors) {
nextColor.colors = {red: 255, green: 0, blue: 255};
}
nextColor.colors.red = nextColor.colors.red < 20 ? 255 : nextColor.colors.red - 10;
nextColor.colors.blue = nextColor.colors.blue < 30 ? 255 : nextColor.colors.blue - 20;
nextColor.colors.green = nextColor.colors.green > 200 ? 0 : nextColor.colors.green + 10;
return "rgb(" + nextColor.colors.red + "," + nextColor.colors.green + "," + nextColor.colors.blue + ")";
};
var TileWidth = 100;
var TileHeight = TileWidth * 2 / 3;
// Tiles the element with map tiles
function mapTiles(entry) {
let el = entry.target;
let color = nextColor();
let cols = Math.ceil(entry.clientWidth / TileWidth);
let rows = Math.ceil(entry.clientHeight / TileHeight);
let tileCount = cols * rows;
while (el.childNodes.length > tileCount)
el.removeChild(el.firstChild);
while (el.childNodes.length < tileCount)
el.appendChild(document.createElement('div'));
let colWidth = entry.clientWidth / cols;
let rowHeight = entry.clientHeight / rows;
for (let r=0; r<rows; r++)
for (let c=0; c<cols; c++) {
let tile = el.childNodes.item(r * cols + c);
tile.innerText = r + "." + c;
tile.style.boxSizing = 'border-box';
tile.style.position = 'absolute';
tile.style.left = `${c * colWidth}px`;
tile.style.width = `${colWidth}px`;
tile.style.top = `${r * rowHeight}px`;
tile.style.height = `${rowHeight}px`;
tile.style.borderColor = color;
tile.classList.add('yellowBorder');
}
}
function elipse(entry) {
entry.target.width = entry.target.clientWidth;
entry.target.height = entry.target.clientHeight;
let ctx = entry.target.getContext('2d');
let rx = entry.target.clientWidth / 2;
let ry = entry.target.clientHeight / 2;
ctx.beginPath();
ctx.clearRect(0,0, entry.target.clientWidth, entry.target.clientHeight);
ctx.arc(rx, ry, 10, 0, 2 * Math.PI);
ctx.stroke();
ctx.beginPath();
ctx.ellipse(rx, ry, rx, ry, 0, 0, 2 * Math.PI);
ctx.stroke();
}
function domMunch(entry) {
const munchSize = 3;
var target = entry.target;
if (target.childNodes.length < munchSize) {
var div = document.createElement('div');
div.innerText = `${target.childNodes.length}`;
target.appendChild(div);
}
if (target.childNodes.length == munchSize)
while (target.childNodes.length > 0)
target.removeChild(target.firstChild);
}
function initResizeHandlers() {
for (let el of document.querySelectorAll('.maptiles'))
el.onresize = mapTiles;
for (let el of document.querySelectorAll('.elipse'))
el.onresize = elipse;
for (let el of document.querySelectorAll('.domMunch'))
el.onresize = domMunch;
}
// Initialization
initResizeHandlers();
toggleObserve();
let rangeEl = document.querySelector("#rangeInput");
rangeEl.addEventListener('change', _ => { setRange(); });
rangeEl.value = range;
function throttleRaf(fn) {
if (throttleRaf.waiting)
return;
else {
throttleRaf.waiting = true;
window.requestAnimationFrame( _ => {
throttleRaf.waiting = false;
fn();
});
}
}
document.body.addEventListener('keydown', ev => {
switch(ev.key) {
case "ArrowRight":
throttleRaf(grow);
break;
case "ArrowLeft":
throttleRaf(shrink);
break;
case "ArrowUp":
rangeEl.value = parseFloat(rangeEl.value) + 1;
setRange();
ev.preventDefault();
break;
case "ArrowDown":
rangeEl.value = parseFloat(rangeEl.value) - 1;
setRange();
ev.preventDefault();
break;
default:
break;
}
});
</script>
</body>