audio: Add a custom AutoPauseScale widget

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

audio/scale.py

@@ -59,6 +59,19 @@ class SeekScale(ScalePlus):
         return GLib.SOURCE_CONTINUE
 
 
+class AutoPauseScale(ScalePlus):
+    def __init__(self):
+        ScalePlus.__init__(self, -1, 99, 1, 5)
+        self.set_digits(0)
+
+    def format_value(self, scale, value):
+        value = int(value)
+        if   value == -1: return "Keep Playing"
+        elif value ==  0: return "This Track"
+        elif value ==  1: return "Next Track"
+        return f"{value} Tracks"
+
+
 class VolumeScale(ScalePlus):
     def __init__(self, player):
         ScalePlus.__init__(self, 0.0, 1.0, 0.05, 0.25)

audio/test_scale.py

@@ -109,6 +109,27 @@ class TestSeekScale(unittest.TestCase):
         self.assertEqual(fake.seek_val, 0)
 
 
+class TestAutoPauseScale(unittest.TestCase):
+    def test_autopause_scale_init(self):
+        pause = scale.AutoPauseScale()
+        adj  = pause.get_adjustment()
+
+        self.assertIsInstance(pause, scale.ScalePlus)
+        self.assertEqual(pause.get_digits(), 0)
+        self.assertEqual(adj.get_value(), -1)
+        self.assertEqual(adj.get_lower(), -1)
+        self.assertEqual(adj.get_upper(), 99)
+        self.assertEqual(adj.get_step_increment(), 1)
+        self.assertEqual(adj.get_page_increment(), 5)
+
+    def test_autopause_scale_values(self):
+        pause = scale.AutoPauseScale()
+        self.assertEqual(pause.format_value(pause, -1), "Keep Playing")
+        self.assertEqual(pause.format_value(pause,  0), "This Track")
+        self.assertEqual(pause.format_value(pause,  1), "Next Track")
+        self.assertEqual(pause.format_value(pause,  2), "2 Tracks")
+
+
 class TestVolumeScale(unittest.TestCase):
     def test_volume_scale_init(self):
         fake = FakePlayer(0, 5 * Gst.SECOND, 1.0)