move layout construction into builder class

separates construction from app representation

src/nvda_voicemeeter/builder.py

@@ -0,0 +1,66 @@
+import PySimpleGUI as psg
+
+
+class Builder:
+    """Responsible for building the Window layout"""
+
+    def __init__(self, window, vm):
+        self.window = window
+        self.vm = vm
+        self.kind = self.vm.kind
+
+    def run(self) -> list:
+        row0 = self.make_row0()
+        row1 = self.make_row1()
+        return [[row0], [row1]]
+
+    def make_row0(self):
+        def add_physical_device_opts(layout):
+            devices = ["{type}: {name}".format(**self.vm.device.output(i)) for i in range(self.vm.device.outs)]
+            devices.append("Deselect Device")
+            layout.append(
+                [
+                    psg.Combo(
+                        devices,
+                        size=(22, 4),
+                        expand_x=True,
+                        enable_events=True,
+                        readonly=True,
+                        key=f"HARDWARE OUT||A{i}",
+                    )
+                    for i in range(1, self.kind.phys_out + 1)
+                ]
+            )
+
+        hardware_out = list()
+        [step(hardware_out) for step in (add_physical_device_opts,)]
+        return psg.Frame("Hardware Out", hardware_out)
+
+    def make_row1(self):
+        def add_asio_checkboxes(layout, i):
+            nums = list(range(99))
+            layout.append(
+                [psg.Spin(nums, initial_value=0, size=2, enable_events=True, key=f"ASIO CHECKBOX||IN{i} 0")],
+            )
+            layout.append(
+                [psg.Spin(nums, initial_value=0, size=2, enable_events=True, key=f"ASIO CHECKBOX||IN{i} 1")],
+            )
+
+        inner = list()
+        asio_checkboxes_in1, asio_checkboxes_in2, asio_checkboxes_in3, asio_checkboxes_in4, asio_checkboxes_in5 = (
+            [] for _ in range(5)
+        )
+        for i, checkbox_list in enumerate(
+            (
+                asio_checkboxes_in1,
+                asio_checkboxes_in2,
+                asio_checkboxes_in3,
+                asio_checkboxes_in4,
+                asio_checkboxes_in5,
+            )
+        ):
+            [step(checkbox_list, i + 1) for step in (add_asio_checkboxes,)]
+            inner.append(psg.Frame(f"In#{i + 1}", checkbox_list))
+
+        asio_checkboxes = [inner]
+        return psg.Frame("PATCH ASIO Inputs to Strips", asio_checkboxes)