fungus/Assets/Fungus/Scripts/Commands/SetAudioVolume.cs

// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)

using UnityEngine;

namespace Fungus
{
    /// <summary>
    /// Sets the global volume level for audio played with Play Music and Play Sound commands.
    /// </summary>
    [CommandInfo("Audio",
                 "Set Audio Volume",
                 "Sets the global volume level for audio played with Play Music and Play Sound commands.")]
    [AddComponentMenu("")]
    public class SetAudioVolume : Command
    {
        [Range(0,1)]
        [Tooltip("Global volume level for audio played using Play Music and Play Sound")]
        [SerializeField] protected float volume = 1f;

        [Range(0,30)]
        [Tooltip("Time to fade between current volume level and target volume level.")]
        [SerializeField] protected float fadeDuration = 1f;

        [Tooltip("Wait until the volume fade has completed before continuing.")]
        [SerializeField] protected bool waitUntilFinished = true;

        public override void OnEnter()
        {
            IMusicController musicController = MusicController.GetInstance();
            if (musicController != null)
            {
                musicController.SetAudioVolume(volume, fadeDuration, () => {
                    if (waitUntilFinished)
                    {
                        Continue();
                    }
                });
            }

            if (!waitUntilFinished)
            {
                Continue();
            }
        }

        public override string GetSummary()
        {
            return "Set to " + volume + " over " + fadeDuration + " seconds.";
        }

        public override Color GetButtonColor()
        {
            return new Color32(242, 209, 176, 255);
        }
    }
}