value tab plots complex selection; graphwindows shows last path for export; filedialog uses call not init

src/gui_qt/main/management.py

@@ -9,12 +9,13 @@ from nmreval.fit import data as fit_d
 from nmreval.fit.model import Model
 from nmreval.fit.result import FitResult
 from nmreval.fit.minimizer import FitRoutine
-from nmreval.lib.colors import TUColorsC, available_cycles
+from nmreval.lib.colors import available_cycles
 from nmreval.math.interpol import interpolate
 from nmreval.math.logfourier import logft
 from nmreval.math.smooth import smooth
 from nmreval.nmr.relaxation import Relaxation
 
+from ..Qt import QtCore, QtWidgets
 from ..lib.undos import *
 from ..data.container import *
 from ..io.filereaders import QFileReader
@@ -112,6 +113,8 @@ class UpperManagement(QtCore.QObject):
         self.undostack = QtWidgets.QUndoStack()
         self.deleteData.connect(self.plot_from_graph)
 
+        self._filereader = None
+
     def __setitem__(self, key: str, value, **kwargs):
         if isinstance(value, ExperimentContainer):
             item = value
@@ -148,7 +151,9 @@ class UpperManagement(QtCore.QObject):
         return _id
 
     def load_files(self, fname: List[str], new_plot: str = None):
-        ret_dic = QFileReader(manager=self).readfiles(fname)
+        if self._filereader is None:
+            self._filereader = QFileReader(manager=self)
+        ret_dic = self._filereader.readfiles(fname)
         self.add_new_data(ret_dic, new_plot)
 
     def _load_session(self, sets: dict, graphs: dict):
@@ -1000,9 +1005,9 @@ class UpperManagement(QtCore.QObject):
             if opts['axis1'] in ['t', 'invt1000']:
                 t_p = opts['t_param']
                 if len(t_p) == 2:
-                    from ...models import Arrhenius as Func
+                    from nmreval.models import Arrhenius as Func
                 else:
-                    from ...models import VFT as Func
+                    from nmreval.models import VFT as Func
 
                 _x = Func.func(x1, *t_p, invt=opts['axis1'])
 
@@ -1078,7 +1083,7 @@ class UpperManagement(QtCore.QObject):
                 raise ValueError('No file extension detected')
 
         if suffix == '.nmr':
-            from ...io.sessionwriter import NMRWriter
+            from nmreval.io.sessionwriter import NMRWriter
             NMRWriter(self.graphs, self.data).export(path)
 
             return