use DESC_TYPES and stored type to choose DescType on file load

grum/mainwin.py

@@ -2,7 +2,7 @@ from PyQt5.QtCore import Qt, pyqtSignal
 from PyQt5.QtWidgets import QMainWindow, QSplitter
 
 from . import assets
-from .descs import PlotDescription, ImageDescription
+from .descs import DESC_TYPES, PlotDescription, ImageDescription
 from .dictlist import DictList
 from .exampledata import exampledata
 from .h5filedlg import open_h5_files_dialog, save_h5_file_dialog
@@ -208,7 +208,8 @@ class MainWindow(QMainWindow):
         for fn in fns:
             data = read_dict(fn)
             for k, v in data.items():
-                DescType = ImageDescription if "image" in v else PlotDescription #TODO
+                tn = v.pop("type")
+                DescType = DESC_TYPES[tn]
                 self.add_new_desc_to_list(DescType, k, v)