Add shortcuts to control stream's volume

src/modules/shortcuts/shortcut-sound.ts

@@ -0,0 +1,53 @@
+import { t } from "@utils/translation";
+import { STATES } from "@utils/global";
+import { PrefKey, getPref, setPref } from "@utils/preferences";
+import { Toast } from "@utils/toast";
+import { BxEvent } from "@/utils/bx-event";
+import { ceilToNearest, floorToNearest } from "@/utils/utils";
+
+export class SoundShortcut {
+    static increaseGainNodeVolume(amount: number) {
+        SoundShortcut.#adjustGainNodeVolume(amount);
+    }
+
+    static decreaseGainNodeVolume(amount: number) {
+        SoundShortcut.#adjustGainNodeVolume(-1 * Math.abs(amount));
+    }
+
+    static #adjustGainNodeVolume(amount: number): number {
+        if (!getPref(PrefKey.AUDIO_ENABLE_VOLUME_CONTROL)) {
+            return 0;
+        }
+
+        const currentValue = getPref(PrefKey.AUDIO_VOLUME);
+        let nearestValue: number;
+
+        if (amount > 0) {  // Increase
+            nearestValue = ceilToNearest(currentValue, amount);
+        } else {  // Decrease
+            nearestValue = floorToNearest(currentValue, -1 * amount);
+        }
+
+        let newValue: number;
+        if (currentValue !== nearestValue) {
+            newValue = nearestValue;
+        } else {
+            newValue = currentValue + amount;
+        }
+
+        newValue = setPref(PrefKey.AUDIO_VOLUME, newValue);
+        SoundShortcut.setGainNodeVolume(newValue);
+
+        // Show toast
+        Toast.show(`${t('stream')} ❯ ${t('volume')}`, newValue + '%', {instant: true});
+        BxEvent.dispatch(window, BxEvent.GAINNODE_VOLUME_CHANGED, {
+                volume: newValue,
+            });
+
+        return newValue;
+    }
+
+    static setGainNodeVolume(value: number) {
+        STATES.currentStream.audioGainNode && (STATES.currentStream.audioGainNode.gain.value = value / 100);
+    }
+}