don't go out of focus during initialization

python/damask/_environment.py

@@ -3,23 +3,30 @@ from pathlib import Path
 
 class Environment:
 
+    # ToDo: Probably, we don't need a class (just a module with a few functions)
     def __init__(self):
-        """Read and provide values of DAMASK configuration."""
-        self.screen_width  = 1024
-        self.screen_height =  768
+        """Do Nothing."""
+        pass
+
+    @property
+    def screen_size(self):
+        width  = 1024
+        height =  768
         try:
             import wx
-            _ = wx.App(False)                                           # noqa
-            self.screenwidth, self.screenheight = wx.GetDisplaySize()
+            _ = wx.App(False)                                                                       # noqa
+            width, height = wx.GetDisplaySize()
         except ImportError:
             try:
                 import tkinter
                 tk = tkinter.Tk()
-                self.screen_width  = tk.winfo_screenwidth()
-                self.screen_height = tk.winfo_screenheight()
+                width  = tk.winfo_screenwidth()
+                height = tk.winfo_screenheight()
                 tk.destroy()
             except Exception as e:
                 pass
+        return (width,height)
+
 
     @property
     def options(self):
@@ -32,6 +39,7 @@ class Environment:
 
         return options
 
+
     @property
     def root_dir(self):
         """Return DAMASK root path."""

python/damask/_vtk.py

@@ -242,7 +242,7 @@ class VTK:
         ren.AddActor(actor)
         ren.SetBackground(0.2,0.2,0.2)
 
-        window.SetSize(Environment().screen_width,Environment().screen_height)
+        window.SetSize(Environment().screen_size[0],Environment().screen_size[1])
 
         iren = vtk.vtkRenderWindowInteractor()
         iren.SetRenderWindow(window)