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Add a loading screen to the web page #1

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Add a loading screen to the web page #1

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3 changes: 3 additions & 0 deletions wasm/.gitignore
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Original file line number Diff line number Diff line change
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assets/
bevy_game.js
bevy_game_bg.wasm
50 changes: 50 additions & 0 deletions wasm/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<script src="./loading_screen.mjs"></script>

<script type="module">
// Load the game asynchronously
import("./bevy_game.js").then((game) => {
game.default();
});
</script>

<style>
body {
margin: 0px;
height: 100vh;
width: 100vw;
overflow: hidden;

background-color: white;
color: #023e8a;
}

#loading-screen {
width: 100%;
height: 100%;

display: flex;
flex-flow: column;
justify-content: center;
align-items: center;

font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

#loading-indicator {
font-size: 4em;
}
</style>
</head>

<body id="body">
<div id="loading-screen">
<div id="loading-indicator">
Loading<span id="loading-dots">...</span>
</div>
<div>Made with Bevy</div>
</div>
</body>
</html>
58 changes: 58 additions & 0 deletions wasm/loading_screen.mjs
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const MAX_DOT_COUNT = 3;

window.addEventListener("DOMContentLoaded", () => {
const body = document.getElementById("body");
const loadingScreen = document.getElementById("loading-screen");
const dotElement = document.getElementById("loading-dots");

if (body === null || loadingScreen === null || dotElement === null) {
console.error("Can't find loading screen elements!");
return;
};

let dotCount = 0;

function animateLoadingDots() {
dotElement.innerText = ".".repeat(dotCount).padEnd(3, "\u{00A0}");

dotCount += 1;

if (dotCount > MAX_DOT_COUNT) {
dotCount = 0;
}
}

function removeLoadingScreen() {
clearInterval(loadingInterval);
loadingScreen.remove();
}

// Wait for the `canvas` element to be created
// This tells us that the game has been fully loaded
const observer = new MutationObserver((mutations) => {
for (const mutation of mutations) {
for (const addedNode of mutation.addedNodes) {
console.debug("addedNode", addedNode, addedNode.ELEMENT_NODE);
if (addedNode.ELEMENT_NODE === 1) {
/** @type HTMLElement */
const element = addedNode;

console.debug(element.tagName);

if (element.tagName === "CANVAS") {
// The game has been loaded!
// We don't need the loading screen anymore
removeLoadingScreen();
observer.disconnect();
}
}
}
}
});

observer.observe(body, {
childList: true,
});

const loadingInterval = setInterval(animateLoadingDots, 1000);
});