SoundClipEditor.cs

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using UnityEngine;
using UnityEditor;

namespace HKI.Core.Audio.Editor
{
    [CanEditMultipleObjects]
    [CustomEditor(typeof(SoundClip))]
    public class SoundClipEditor : UnityEditor.Editor
    {
        // Private variables
        const string clipSPName = "Clip";
        const string volumeSPName = "Volume";
        const string pitchSPName = "Pitch";

        SerializedProperty clipSP = null;
        SerializedProperty volumeSP = null;
        SerializedProperty pitchSP = null;

        // OnEnable function
        void OnEnable()
        {
            clipSP = serializedObject.FindProperty(clipSPName);
            volumeSP = serializedObject.FindProperty(volumeSPName);
            pitchSP = serializedObject.FindProperty(pitchSPName);
        }

        // OnDisable
        void OnDisable()
        {
            PublicAudioUtil.StopClipPlaying();
        }

        // OnInspectorGUI function
        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            EditorGUILayout.LabelField("General Variables", EditorStyles.boldLabel);

            EditorGUILayout.BeginHorizontal();
            EditorGUI.BeginChangeCheck();
            EditorGUILayout.PropertyField(clipSP);
            if(EditorGUI.EndChangeCheck())
                PublicAudioUtil.StopClipPlaying();

            GUI.enabled = clipSP.objectReferenceValue != null;
            if(PublicAudioUtil.IsClipPlaying((AudioClip)clipSP.objectReferenceValue))
            {
                if (GUILayout.Button("Stop", GUILayout.Width(50.0f)))
                    PublicAudioUtil.StopClipPlaying();
            }
            else
            {
                if (GUILayout.Button("Play", GUILayout.Width(50.0f)))
                    PublicAudioUtil.PlayClip((AudioClip)clipSP.objectReferenceValue);
            }
            GUI.enabled = true;
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.PropertyField(volumeSP);
            EditorGUILayout.PropertyField(pitchSP);
            serializedObject.ApplyModifiedProperties();
        }

    }
}