layout.json

{
 "info": {"version": 1, "license": "GPL-2.1-or-later", "author": "Richard Palethorpe (richiejp.com)"},
 "layout": {
  "cols": 1, "rows": 3,
  "align": "fill",
  "rfill": "1, 0, 0",
  "widgets": [
   {"type": "pixmap", "on_event": "pixmap_on_event", "align": "fill", "w": 64, "h": 64, "uid": "pixmap"},
   {"type": "frame", "title": "Settings", "halign": "fill",
    "widget": {
     "rows": 3,
     "halign": "fill",
     "widgets": [
      {
       "halign": "fill",
       "cols": 5,
       "cfill": "5 * 0",
       "cpadf": "0, 0, 1, 1, 0, 0",
       "border": "none",
       "widgets": [
        {"type": "label", "text": "Rules No.", "halign": "left"},
        {"type": "tbox", "on_event": "rule_widget_on_event", "len": 10, "text": "110"},
        {"type": "checkbox", "label": "Reversible", "on_event": "rule_widget_on_event"},
        {"type": "label", "text": "Meta Rule No."},
        {"type": "tbox", "on_event": "meta_rule_widget_on_event", "len": 3, "text": "0"}
       ]
      },
      {
       "halign": "fill",
       "cols": 4,
       "cpadf": "0, 0, 1, 0, 0",
       "cfill": "0, 0, 0, 0",
       "border": "none",
       "widgets": [
        {"type": "label", "text": "Width (x64)", "halign": "left"},
        {"type": "tbox", "len": 2, "max_len": 2, "text": "1", "on_event": "width_widget_on_event"},
        {"type": "label", "text": "Height", "halign": "left"},
        {"type": "tbox", "len": 4, "max_len": 4, "text": "64", "on_event": "height_widget_on_event"}
       ]
      },
      {
       "halign": "fill",
       "cols": 2,
       "cfill": "0, 1",
       "border": "none",
       "widgets": [
        {"type": "label", "text": "Initial Conditions:"},
        {"type": "tbox", "uid": "init", "halign": "fill", "on_event": "init_widget_on_event", "len": 40}
       ]
      }
     ]
    }
   },
   {"type": "button", "btype": "save", "label": "Save Image", "on_event": "save_on_event"}
  ]
 }
}