Unity project window audio buttons

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using PowerTools;
using System.Reflection;


namespace PowerTools.Quest
{

[InitializeOnLoad]
public static class AudioProjectWindowDetails
{
    static AudioProjectWindowDetails()
    {
        EditorApplication.projectWindowItemOnGUI += DrawAssetDetails;
    }

    static void DrawAssetDetails(string guid, Rect rect)
    {
        Event ev = Event.current;
        if (Application.isPlaying || (ev.type != EventType.Repaint && ev.type != EventType.MouseUp && ev.type != EventType.MouseDown/*  && ev.type != EventType.ExecuteCommand*/ ) || !IsMainListAsset(rect))
            return;

        string assetPath = AssetDatabase.GUIDToAssetPath(guid);
        if (AssetDatabase.IsValidFolder(assetPath))
            return;

        Object asset = AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(assetPath);
        if (asset == null)  // this entry could be Favourites or Packages. Ignore it.
            return;

        if ( asset is AudioClip )
        {
            if ( DrawAudioClip(rect, asset as AudioClip) )
                return;
        }

        GameObject gobj = (asset as GameObject);
        if ( gobj == null )
            return;
        if ( DrawAudioCue(rect,gobj) )
            return;
    }

    static bool DrawAudioClip(Rect rect, AudioClip clip)
    {
        // Draw "New Cue" button, or "Add Cue" if there's an selected audiocue selected
        if ( clip == null )
            return false;

        EditorLayouter layout = new EditorLayouter(rect);
        layout
            .Stretched // name
            .Fixed(80) // Add
            //.Space
            .Fixed(40); // Play
        layout.Skip();

        GUIStyle style = new GUIStyle(EditorStyles.miniButton);
        style.fixedHeight = style.fixedHeight-4f;

        if ( Selection.activeGameObject != null && Selection.activeGameObject.GetComponent<AudioCue>() != null)
        {
            if ( GUI.Button(layout,"Add to Cue", style) )
            {
                AudioCue cue = Selection.activeGameObject.GetComponent<AudioCue>();
                cue.m_sounds.Add( new AudioCue.Clip() { m_sound = clip, m_weight = 100 } );
                cue.GetShuffledIndex().SetWeights( cue.m_sounds, (item)=>item.m_weight );
                EditorUtility.SetDirty(Selection.activeGameObject);
            }
        }
        else
        {
            if ( GUI.Button(layout,"New Cue", style) )
            {
                if ( Selection.objects.Length > 0 && System.Array.Find(Selection.objects, item=>item == clip) )
                    AudioCueEditor.ContextCreateAudioCue(new MenuCommand(null)); // create all seelected into single cue
                else
                    AudioCueEditor.CreateAudioCue(new AudioClip[]{clip}); // create new cue from single item
            }
        }
        // Play button
        if ( GUI.Button(layout,"Play",style))
        {
            PlayClip(clip,0,false);
        }
        return true;

    }
    public static void PlayClip(AudioClip clip, int startSample, bool loop)
    {
        Assembly unityEditorAssembly = typeof(AudioImporter).Assembly;
        System.Type audioUtilClass = unityEditorAssembly.GetType("UnityEditor.AudioUtil");
        MethodInfo method = audioUtilClass.GetMethod(
            "PlayPreviewClip",
            BindingFlags.Static | BindingFlags.Public,
            null,
            new System.Type[] {
            typeof(AudioClip),
            typeof(System.Int32),
            typeof(System.Boolean)
        },
        null
        );
        method?.Invoke(
            null,
            new object[] { clip,startSample,loop }
        );

        //SetClipSamplePosition(clip, startSample);
    }

    static bool DrawAudioCue(Rect rect, GameObject gobj)
    {
        AudioCue cue = gobj.GetComponent<AudioCue>();
        if ( cue == null )
            return false;

        const int width = 40;
        rect.x += rect.width-width;
        rect.width = width;

        GUIStyle style = new GUIStyle(EditorStyles.miniButton);
        style.fixedHeight = style.fixedHeight-4f;

        if ( SystemAudio.GetValid() && SystemAudio.IsPlaying(gobj.name) )
        {
            if ( GUI.Button(rect,"Stop", style) )
            {
                    if ( Application.isEditor && SystemAudio.GetValid() )
                            GameObject.DestroyImmediate( SystemAudio.Get.gameObject );
                    SystemAudio.Stop(gobj.name,0.1f);
            }
        }
        else if ( GUI.Button(rect,"Play", style) )
        {
            if ( Application.isEditor && SystemAudio.GetValid() )
                    GameObject.DestroyImmediate( SystemAudio.Get.gameObject );
            SystemAudio.Play(cue);//(asset as GameObject).GetComponent<AudioCue>());
        }
        return true;
    }

    static bool IsMainListAsset(Rect rect)
    {
        // Don't draw details if project view shows large preview icons:
        if (rect.height > 20)
        {
            return false;
        }
        // Don't draw details if this asset is a sub asset:
        if (rect.x > 16)
        {
            return false;
        }
        return true;
    }

}

}