Add scrollbar to interface

src/interface.py

@@ -1,4 +1,4 @@
-from tkinter import Tk
+from tkinter import Tk, VERTICAL, LEFT, RIGHT, Y, BOTH
 from tkinter import ttk
 
 from instance import Instance, gen_function_for_instance
@@ -7,14 +7,30 @@ from settings import MainSettings, SortType
 
 def start_ui(instances: [Instance], settings):
     root = Tk()
-    frame = ttk.Frame(root, padding=50)
-    frame.grid()
-    ttk.Label(frame, text="Available Databases").grid(column=0, row=0)
 
     # Alphanumeric sorting
     if MainSettings.Sort == SortType.ALPHA:
         instances = list(sorted(instances))
 
+    canvas = ttk.Canvas(root)
+    scrollbar = ttk.Scrollbar(root, orient=VERTICAL, command=canvas.yview)
+    frame = ttk.Frame(canvas)
+
+    frame.bind(
+        "<Configure>",
+        lambda e: canvas.configure(
+            scrollregion=canvas.bbox("all")
+        )
+    )
+
+    canvas.create_window((0, 0), window=frame, anchor="nw")
+    canvas.configure(yscrollcommand=scrollbar.set)
+
+    canvas.pack(side=LEFT, fill=BOTH, expand=True)
+    scrollbar.pack(side=RIGHT, fill=Y)
+
+    ttk.Label(frame, text="Available Databases").grid(column=0, row=0)
+
     for row, instance in enumerate(instances):
         if instance.disable and not MainSettings.ShowAll:
             continue