feat: add volume slider

web/index.html

@@ -12,6 +12,10 @@
 				<div class="button-container">
 					<button id="play-btn" class="button">play</button>
 				</div>
+				<div class="volume-slider-container">
+					<output id="current-volume-label" for="volume-slider">100%</output>
+					<input id="volume-slider" type="range" min="0" max="100" step="1" />
+				</div>
 			</main>
 			<img class="cat" src="/images/cat-0.png"></img>
 			<img class="eeping-cat" src="/images/eeping-cat.png"></img>

web/script.js

@@ -1,5 +1,7 @@
 const playBtn = document.getElementById("play-btn");
 const catImg = document.getElementsByClassName("cat")[0];
+const volumeSlider = document.getElementById("volume-slider");
+const currentVolumeLabel = document.getElementById("current-volume-label");
 const clickAudio = new Audio("/audio/click.wav");
 const clickReleaseAudio = new Audio("/audio/click-release.wav");
 
@@ -8,8 +10,10 @@ const CROSSFADE_INTERVAL_MS = 20;
 const AUDIO_DURATION_MS = 60000;
 
 let isPlaying = false;
+let isFading = false;
 let currentAudio;
-let volume = 0;
+let maxVolume = 100;
+let currentVolume = 0;
 
 function playAudio() {
 	// add a random query parameter at the end to prevent browser caching
@@ -20,11 +24,11 @@ function playAudio() {
 	};
 	currentAudio.onpause = () => {
 		isPlaying = false;
-		volume = 0;
+		currentVolume = 0;
 		playBtn.innerText = "play";
 	};
 	currentAudio.onended = () => {
-		volume = 0;
+		currentVolume = 0;
 		playAudio();
 	};
 	currentAudio.volume = 0;
@@ -40,33 +44,43 @@ function playAudio() {
 function pauseAudio() {
 	currentAudio.pause();
 	currentAudio.volume = 0;
-	volume = 0;
+	currentVolume = 0;
 }
 
 function fadeIn() {
+	isFading = true;
+
 	// volume ranges from 0 to 100, this determines by how much the volume number
 	// should be incremented at every step of the fade in
-	const volumeStep = 100 / (CROSSFADE_DURATION_MS / CROSSFADE_INTERVAL_MS);
+	const volumeStep =
+		maxVolume / (CROSSFADE_DURATION_MS / CROSSFADE_INTERVAL_MS);
 	const handle = setInterval(() => {
-		volume += volumeStep;
-		if (volume >= 100) {
+		currentVolume += volumeStep;
+		if (currentVolume >= maxVolume) {
 			clearInterval(handle);
+			currentVolume = maxVolume;
+			isFading = false;
 		} else {
-			currentAudio.volume = volume / 100;
+			currentAudio.volume = currentVolume / 100;
 		}
 	}, CROSSFADE_INTERVAL_MS);
 }
 
 function fadeOut() {
+	isFading = true;
+
 	// volume ranges from 0 to 100, this determines by how much the volume number
 	// should be decremented at every step of the fade out
-	const volumeStep = 100 / (CROSSFADE_DURATION_MS / CROSSFADE_INTERVAL_MS);
+	const volumeStep =
+		maxVolume / (CROSSFADE_DURATION_MS / CROSSFADE_INTERVAL_MS);
 	const handle = setInterval(() => {
-		volume -= volumeStep;
-		if (volume <= 0) {
+		currentVolume -= volumeStep;
+		if (currentVolume <= 0) {
 			clearInterval(handle);
+			currentVolume = 0;
+			isFading = false;
 		} else {
-			currentAudio.volume = volume / 100;
+			currentAudio.volume = currentVolume / 100;
 		}
 	}, CROSSFADE_INTERVAL_MS);
 }
@@ -102,4 +116,14 @@ playBtn.onclick = () => {
 	}
 };
 
+volumeSlider.oninput = () => {
+	maxVolume = volumeSlider.value;
+	currentVolumeLabel.textContent = `${maxVolume}%`;
+	if (!isFading) {
+		currentAudio.volume = maxVolume / 100;
+		currentVolume = maxVolume;
+	}
+};
+
+volumeSlider.value = 100;
 animateCat();

web/style.css

@@ -1,9 +1,11 @@
 :root {
   font-family: monospace;
   --text: #4c4f69;
-  --surface0: #ccd0da;
   --surface1: #bcc0cc;
   --base: #eff1f5;
+  --lavender: #7287fd;
+
+  --range-height: 12px;
 }
 
 @media (prefers-color-scheme: dark) {
@@ -11,6 +13,7 @@
     --text: #cdd6f4;
     --surface1: #45475a;
     --base: #1e1e2e;
+    --lavender: #b4befe;
   }
 }
 
@@ -20,8 +23,8 @@ body {
 }
 
 body {
-  width: calc(100% - 4rem - 1px);
-  height: calc(100vh - 4rem - 1px);
+  width: calc(100% - 4rem - 2px);
+  height: calc(100vh - 4rem - 2px);
   padding: 2rem;
   margin: 0;
   background-color: var(--base);
@@ -35,6 +38,7 @@ h5,
 h6 {
   margin: 0;
   font-weight: 400;
+  color: var(--text);
 }
 
 main {
@@ -65,7 +69,7 @@ main {
   display: flex;
   align-items: end;
   justify-content: start;
-  border: 1px solid var(--text);
+  border: 2px solid var(--text);
   border-radius: 2px;
 }
 
@@ -112,6 +116,46 @@ main {
   display: flex;
 }
 
+.volume-slider-container {
+  position: absolute;
+  top: 0;
+  right: 0;
+  padding: 0.5rem 1rem;
+  margin: 1rem;
+  display: flex;
+  justify-content: start;
+  align-items: center;
+}
+
+.volume-slider-container > output {
+  color: var(--text);
+  margin-right: 1rem;
+}
+
+@media screen and (-webkit-min-device-pixel-ratio: 0) {
+  input[type="range"] {
+    overflow: hidden;
+    -webkit-appearance: none;
+    border: 2px solid var(--text);
+    background-color: var(--base);
+  }
+
+  input[type="range"]::-webkit-slider-runnable-track {
+    height: var(--range-height);
+    -webkit-appearance: none;
+    color: #13bba4;
+    margin-top: -1px;
+  }
+
+  input[type="range"]::-webkit-slider-thumb {
+    width: var(--range-height);
+    height: var(--range-height);
+    -webkit-appearance: none;
+    background: var(--text);
+    box-shadow: -80px 0 0 80px var(--lavender);
+  }
+}
+
 .button {
   border: 2px solid var(--text);
   background: var(--base);