GUITable class

Creating a matrix table for a two-dimentional array.

private GUITable table;

private void Init()
{
    bool[,] boolArr = new bool[20,20];

    this.table = GUITable.Create(
        twoDimArray: boolArr,
        drawElement: (rect, x, y) => boolArr[x, y] = EditorGUI.Toggle(rect, boolArr[x, y]),
        horizontalLabel: "Optional Horizontal Label",               // horizontalLabel is optional and can be null.
        columnLabels: (rect, x) => GUI.Label(rect, x.ToString()),   // columnLabels is optional and can be null.
        verticalLabel: "Optional Vertical Label",                   // verticalLabel is optional and can be null.
        rowLabels: (rect, x) => GUI.Label(rect, x.ToString())       // rowLabels is optional and can be null.
    );
}

private void OnGUI()
{
    this.table.DrawTable();
}

Creating a table for a list.

private GUITable table;

private void Init()
{
    Listt<SomeClasst> someList = new List<SomeClass>() { new SomeClass(), new SomeClass(), new SomeClass() };

    this.table = GUITable.Create(someList, "Optional Title",
        new GUITableColumn()
        {
            ColumnTitle = "A",
            OnGUI = (rect, i) => someList[i].A = EditorGUI.TextField(rect, someList[i].A),
            Width = 200,
            MinWidth = 100,
        },
        new GUITableColumn()
        {
            ColumnTitle = "B",
            OnGUI = (rect, i) => someList[i].B = EditorGUI.IntField(rect, someList[i].B),
            Resizable = false,
        },
        new GUITableColumn()
        {
            ColumnTitle = "C",
            OnGUI = (rect, i) => someList[i].C = EditorGUI.IntField(rect, someList[i].C),
            SpanColumnTitle = true,
        }
    );
}

private void OnGUI()
{
    this.table.DrawTable();
}

private class SomeClass
{
    public string A;
    public int B;
    public int C;
    public int D;
}

Styling a cell.

Each GUITableCell has two events, OnGUI and OnGUIStyle. OnGUIStyle is called right before OnGUI, but only in repaint events.

guiTable[x,y].GUIStyle += rect => EditorGUI.DrawRect(rect, Color.red);

Row and column span.

A cell will span and cover all neighbour cells that are null.

// Span horizontally:
guiTable[x - 2,y] = null;
guiTable[x - 1,y] = null;
guiTable[x,y].SpanX = true;
guiTable[x + 1,y] = null;

// Span vertically:
guiTable[x,y - 2] = null;
guiTable[x,y - 1] = null;
guiTable[x,y].SpanY = true;
guiTable[x,y + 1] = null;