Unity3D get / set project window search content

ProjectWindowHelper.cs

/*
* References:
* https://github.com/Unity-Technologies/UnityCsReference/blob/master/Editor/Mono/ProjectWindow/SearchFilter.cs
* https://github.com/jamesjlinden/unity-decompiled/blob/master/UnityEditor/UnityEditor/ProjectBrowser.cs
*/

public class ProjectWindowHelper 
{
    public struct ProjectSearch
    {
        public string filter;
        public string[] assetLabels;
        public string[] classNames;

        //Debugging
        public override string ToString()
        {
            string str = "";

            if (filter != null)
                str += "SearchFilter: " + filter;

            if (assetLabels != null && assetLabels.Length > 0)
            {
                str += " Labels: [";

                for (int i = 0; i < assetLabels.Length;i++)
                {
                    if (i > 0)
                        str += ",";
                    str += assetLabels[i];
                }

                str += "] ";
            }

            if (classNames != null)
            {
                str += " Class Names: [";

                for (int i = 0; i < classNames.Length; i++)
                {
                    if (i > 0)
                        str += ",";
                    str += assetLabels[i];
                }

                str += "] ";
            }

            return str;
        }
    }

    //Returns project window
    private static EditorWindow GetProjectWindow()
    {
        EditorWindow[] windows = (EditorWindow[])Resources.FindObjectsOfTypeAll(typeof(EditorWindow));
        EditorWindow projectWindow = null;

        foreach (EditorWindow window in windows)
        {
            if (window.GetType().ToString() == "UnityEditor.ProjectBrowser")
            {
                projectWindow = window;
                break;
            }
        }

        return projectWindow;
    }

    //Forces project search string
    public static void SetProjectSearch(string filter)
    {
        EditorWindow projectWindow = GetProjectWindow();

        if (projectWindow == null)
            return;

        MethodInfo setSearchType = projectWindow.GetType().GetMethod("SetSearch", new[] { typeof(string) });
        
        setSearchType.Invoke(projectWindow, new object[] { filter });
    }

    //Forces project search
    public static void SetProjectSearch(ProjectSearch projectSearch)
    {
        EditorWindow projectWindow = GetProjectWindow();

        if (projectWindow == null)
            return;

        System.Type searchFilterType = projectWindow.GetType().GetField("m_SearchFilter", BindingFlags.Instance | BindingFlags.NonPublic).FieldType;
        MethodInfo setSearchType = projectWindow.GetType().GetMethod("SetSearch", new[] { searchFilterType });

        object searchFilterObject = System.Activator.CreateInstance(searchFilterType);

        searchFilterType.GetField("m_NameFilter", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(searchFilterObject, projectSearch.filter);
        searchFilterType.GetField("m_ClassNames", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(searchFilterObject, projectSearch.classNames);
        searchFilterType.GetField("m_AssetLabels", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(searchFilterObject, projectSearch.assetLabels);

        setSearchType.Invoke(projectWindow, new object[] { searchFilterObject });
    }

    //Returns project search string (tags / labels not included!!!)
    public static string GetProjectSearchString()
    {
        EditorWindow projectWindow = GetProjectWindow();

        if (projectWindow == null)
            return null;

        FieldInfo field = projectWindow.GetType().GetField("m_SearchFilter", BindingFlags.Instance | BindingFlags.NonPublic);
        object filter = field.GetValue(projectWindow);

        return (string)field.FieldType.GetField("m_NameFilter", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(filter);

    }

    //Returns project search string (tags / labels not included!!!)
    public static ProjectSearch GetProjectSearch()
    {
        EditorWindow projectWindow = GetProjectWindow();

        if (projectWindow == null)
            return new ProjectSearch();

        FieldInfo field = projectWindow.GetType().GetField("m_SearchFilter", BindingFlags.Instance | BindingFlags.NonPublic);
        object searchFilter = field.GetValue(projectWindow);

        ProjectSearch projectSearch = new ProjectSearch();

        projectSearch.filter = (string)field.FieldType.GetField("m_NameFilter", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(searchFilter);
        projectSearch.classNames = (string[])field.FieldType.GetField("m_ClassNames", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(searchFilter);
        projectSearch.assetLabels = (string[])field.FieldType.GetField("m_AssetLabels", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(searchFilter);

        return projectSearch;

    }
}