Implemented a scrollbar for json forms.

BIDSHandler/CreationTool/FormHandler.py

@@ -106,7 +106,17 @@ class Form:
     def create_form_json(self):
         """This method is used to create a form for a json file.
         """
-        self.entries = EntryManager.create_entry_from_json(self.form, self.frame, self.help_icon)
+        entry_canvas = tk.Canvas(self.frame, height=self.frame.winfo_toplevel().winfo_height()-100)
+        frame = tk.Frame(entry_canvas)
+        scrollbar = tk.Scrollbar(self.frame, orient="vertical", command=entry_canvas.yview)
+        entry_canvas.create_window((0, 0), window=frame, anchor='nw')
+        entry_canvas.configure(yscrollcommand=scrollbar.set)
+        entry_canvas.grid(row=self.current_row, column=0, sticky='nsew')
+        scrollbar.grid(row=self.current_row, column=5, sticky='ns')
+        frame.bind("<Configure>", lambda e: entry_canvas.configure(scrollregion=entry_canvas.bbox("all")))
+
+        self.entries = EntryManager.create_entry_from_json(self.form, frame, self.help_icon)
+
 
     def create_form_text(self):
         """This method is used to create a form for a text file.