Implement drag'n'drop

public/assets/scripts/FileSelector.js

@@ -0,0 +1,63 @@
+export class FileSelector {
+	dropZones = [];
+	selectedFile = null;
+	onFileSelected = null;
+
+	constructor(mimeType) {
+		this.mimeType = mimeType;
+
+		window.ondrop = (e) => e.preventDefault();
+
+		window.ondragover = (e) => {
+			if (![...e.dataTransfer.items].some(it => it.kind === "file")) return;
+
+			e.preventDefault();
+			if (!this.dropZones.some(dropZone => dropZone.contains(e.target))) {
+				e.dataTransfer.dropEffect = "none";
+			}
+		};
+	}
+
+	selectFile(file) {
+		this.selectedFile = file;
+
+		if (this.onFileSelected) this.onFileSelected(file);
+	}
+
+	addInput(elem) {
+		elem.oninput = () => {
+			setTimeout(() => this.selectFile(elem.files[0]), 200);
+		};
+	}
+
+	addDropZone(elem) {
+		this.dropZones.push(elem);
+
+		elem.ondrop = (e) => {
+			e.preventDefault();
+
+			const file = [...e.dataTransfer.files].find(file => file.type.startsWith(this.mimeType));
+
+			if (file) {
+				this.selectFile(file);
+			}
+		};
+
+		elem.ondragover = (e) => {
+			const items = [...e.dataTransfer.items];
+
+			if (!items.some(it => it.kind === "file")) return;
+
+			e.preventDefault();
+
+			if (items.some(it => it.type.startsWith(this.mimeType))) {
+				e.dataTransfer.dropEffect = "copy";
+				elem.classList.add("dropping");
+			} else {
+				e.dataTransfer.dropEffect = "copy";
+			}
+		};
+
+		elem.ondragleave = () => elem.classList.remove("dropping");
+	}
+}

public/assets/scripts/main.js

@@ -1,21 +1,33 @@
 import { Notifier } from "./Notifier.js";
 import { ProgressBar } from "./ProgressBar.js";
 import { VideoCompressor } from "./VideoCompressor.js";
+import { FileSelector } from "./FileSelector.js";
 
 const notifier = new Notifier();
 const progressBar = new ProgressBar();
 const videoCompressor = new VideoCompressor(progressBar);
+const fileSelector = new FileSelector("video/");
 
-// Reset file input cache after reload
-document.getElementById("file-input").value = "";
+fileSelector.addInput(document.getElementById("file-input"));
+fileSelector.addDropZone(document.getElementById("file-drop-area"));
+
+fileSelector.onFileSelected = file => {
+	document.getElementById("uploaded-video").src = URL.createObjectURL(file);
+	document.getElementById("uploaded-video").load();
+
+	hideElements("#file-drop-area", "#file-input-spacing");
+	showElements("#uploaded-video", "#change-file");
+};
 
 async function compress(filesize, filesizeUnit) {
 	document.getElementById("uploaded-video").pause();
 
-	const file = document.getElementById("file-input").files[0];
+	const sectionChangePromise = showSection("loading");
 
-	if (!file) {
+	if (!fileSelector.selectedFile) {
+		await sectionChangePromise; // Avoid changing sections at the same time
 		alert("Please select a file");
+
 		return;
 	}
 
@@ -27,12 +39,11 @@ async function compress(filesize, filesizeUnit) {
 		case "mb": targetFilesize = filesize * 1000000; break;
 	}
 
-	showSection("loading");
-
 	let result;
 	try {
-		result = await videoCompressor.compress(file, targetFilesize, videoLength);
+		result = await videoCompressor.compress(fileSelector.selectedFile, targetFilesize, videoLength);
 	} catch (e) {
+		await sectionChangePromise; // Avoid changing sections at the same time
 		alert(e.message);
 
 		showSection("file-picker");
@@ -80,45 +91,16 @@ document.getElementById("compress").onclick = async () => {
 	await compress(filesize, filesizeUnit);
 }
 
-for (const preset of document.getElementsByClassName("preset")) {
-	preset.onclick = () => compress(parseInt(preset.dataset.size), preset.dataset.unit);
-}
-
 document.getElementById("cancel").onclick = () => {
 	videoCompressor.stop();
 
 	showSection("file-picker");
 };
 
-function openFileSelector() {
-	document.getElementById("file-input").click();
-}
 
-document.getElementById("file-drop-area").onclick = openFileSelector;
-document.getElementById("change-file").onclick = openFileSelector;
+document.getElementById("change-file").onclick = () => document.getElementById("file-input").click();
 
-for (const tabbable of document.querySelectorAll("[tabindex='0']")) {
-	tabbable.onkeydown = event => {
-		if (['Enter', 'Space'].includes(event.code))
-			tabbable.click();
-	}
-}
-
-document.getElementById("file-input").oninput = () => {
-	setTimeout(() => {
-		const file = document.getElementById("file-input").files[0];
-
-		document.getElementById("uploaded-video").src = URL.createObjectURL(file);
-		document.getElementById("uploaded-video").load();
-
-		hideElements("#file-drop-area", "#file-input-spacing");
-		showElements("#uploaded-video", "#change-file");
-	}, 200);
-};
-
-document.getElementById("back").onclick = () => {
-	showSection("file-picker");
-};
+document.getElementById("back").onclick = () => showSection("file-picker");
 
 window.onbeforeunload = event => {
 	if (videoCompressor.inProgress) event.preventDefault();
@@ -130,3 +112,14 @@ function bytesToSizeString(bytes) {
 	if (bytes >= 1000) return (bytes / 1000).toFixed(1) + " KB";
 	return bytes + " B";
 }
+
+for (const tabbable of document.querySelectorAll("[tabindex='0']")) {
+	tabbable.onkeydown = event => {
+		if (['Enter', 'Space'].includes(event.code))
+			tabbable.click();
+	}
+}
+
+for (const preset of document.getElementsByClassName("preset")) {
+	preset.onclick = () => compress(parseInt(preset.dataset.size), preset.dataset.unit);
+}

public/assets/scripts/ui.js

@@ -6,6 +6,8 @@ function showSection(section) {
 	}
 
 	showElements(`#${section}-section`);
+
+	return new Promise(resolve => setTimeout(resolve, TRANSITION_TIME * 2));
 }
 
 function hideElements() {

public/assets/styles/file-picker-section.css

@@ -29,6 +29,10 @@
 	outline: none;
 }
 
+#file-drop-area.dropping {
+	border-color: black;
+}
+
 #uploaded-video {
 	display: none;
 	opacity: 0;

public/index.html

@@ -4,7 +4,7 @@
 		<meta charset="UTF-8">
 		<meta name="viewport" content="width=device-width, initial-scale=1.0">
 		<meta name="description" content="Easily compress video files to a specific file size for uploading to various communication platforms that restrict upload size">
-		<title>Video Compressor</title>
+		<title>Compact.Video - Compress videos online</title>
 		<script defer src="/assets/scripts/ffmpeg/package/dist/umd/ffmpeg.js"></script>
 		<script defer src="/assets/scripts/ui.js"></script>
 		<script defer type="module" src="/assets/scripts/main.js"></script>
@@ -19,10 +19,10 @@
 		<p>Compress video files to a specific file size, so you can upload them to your favorite social media and messaging apps!</p>
 
 		<section id="file-picker-section">
-			<div id="file-drop-area" tabindex="0">
+			<label id="file-drop-area" tabindex="0">
 				<span>Drag and drop a file here!</span>
-			</div>
 				<input id="file-input" type="file" accept="video/*" tabindex="-1">
+			</label>
 			<div id="file-input-spacing" style="margin-top: -1rem">
 				<button class="simple">.</button>
 			</div>