audio: Create seeking widgets

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

audio/seeker.py

@@ -0,0 +1,35 @@
+# Copyright 2021 (c) Anna Schumaker.
+from gi.repository import Gtk
+
+class Seeker(Gtk.Box):
+    def __init__(self):
+        Gtk.Box.__init__(self)
+
+        self.position = Gtk.Label.new(str="00:00")
+        self.remaining = Gtk.Label.new(str="00:00")
+
+        self.adjustment = Gtk.Adjustment()
+        self.adjustment.set_step_increment(10)
+
+        self.scale = Gtk.Scale()
+        self.scale.set_adjustment(self.adjustment)
+
+        self.append(self.position)
+        self.append(self.scale)
+        self.append(self.remaining)
+
+    def configure(self, position, duration):
+        self.adjustment.set_upper(duration)
+        self.adjustment.set_value(position)
+
+        (m, s) = divmod(int(position), 60)
+        self.position.set_text(f"{m:02}:{s:02}")
+
+        (m, s) = divmod(int(duration - position), 60)
+        self.remaining.set_text(f"{m:02}:{s:02}")
+
+    def connect(self, func):
+        self.scale.connect("change-value", func)
+
+    def get_position(self):
+        return self.scale.get_value()

audio/test_seeker.py

@@ -0,0 +1,40 @@
+# Copyright 2021 (c) Anna Schumaker.
+from . import seeker
+from gi.repository import Gtk
+import unittest
+
+class TestSeeker(unittest.TestCase):
+    def test_seeker_init(self):
+        seek = seeker.Seeker()
+
+        self.assertIsInstance(seek, Gtk.Box)
+        self.assertIsInstance(seek.position, Gtk.Label)
+        self.assertIsInstance(seek.remaining, Gtk.Label)
+        self.assertIsInstance(seek.adjustment, Gtk.Adjustment)
+        self.assertIsInstance(seek.scale, Gtk.Scale)
+
+        self.assertEqual(seek.position.get_text(), "00:00")
+        self.assertEqual(seek.remaining.get_text(), "00:00")
+        self.assertEqual(seek.adjustment.get_step_increment(), 10)
+        self.assertEqual(seek.scale.get_adjustment(), seek.adjustment)
+
+        self.assertIn(seek.position, seek)
+        self.assertIn(seek.scale, seek)
+        self.assertIn(seek.remaining, seek)
+
+    def test_seeker_configure(self):
+        seek = seeker.Seeker()
+
+        seek.configure(10, 100)
+        self.assertEqual(seek.adjustment.get_upper(), 100)
+        self.assertEqual(seek.adjustment.get_value(), 10)
+        self.assertEqual(seek.position.get_text(), "00:10")
+        self.assertEqual(seek.remaining.get_text(), "01:30")
+        self.assertEqual(seek.get_position(), 10)
+
+        seek.configure(65.25, 124.2)
+        self.assertEqual(seek.adjustment.get_upper(), 124.2)
+        self.assertEqual(seek.adjustment.get_value(), 65.25)
+        self.assertEqual(seek.position.get_text(), "01:05")
+        self.assertEqual(seek.remaining.get_text(), "00:58")
+        self.assertEqual(seek.get_position(), 65.25)