audio: Create a custom VolumeControlBox

I also create a shared base class at the same time so autopause controls
can use it as well.

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

audio/controls.py

@@ -1,7 +1,7 @@
 # Copyright 2021 (c) Anna Schumaker.
-from . import menu
 from gi.repository import Gtk, Gst
-
+from . import menu
+from . import scale
 
 class ControlButton(Gtk.Button):
     def __init__(self, player, icon):
@@ -40,6 +40,32 @@ class PlayPauseButton(ControlButton):
         self.set_icon_name(f"media-playback-{icon}")
 
 
+class ControlScaleBox(scale.ScaleButtonBox):
+    def __init__(self, scalectrl):
+        icon = Gtk.Image()
+        icon.add_css_class("large-icons")
+        scalectrl.connect("value-changed", self.on_value_changed, icon)
+        scale.ScaleButtonBox.__init__(self, scalectrl)
+        self.on_value_changed(scalectrl, icon)
+        self.prepend(icon)
+
+    def on_value_changed(self, scale, icon):
+        pass
+
+
+class VolumeControlBox(ControlScaleBox):
+    def __init__(self, player):
+        ControlScaleBox.__init__(self, scale.VolumeScale(player))
+
+    def on_value_changed(self, scale, icon):
+        value = scale.get_value()
+        if   value == 0:   name = "muted"
+        elif value <= 1/3: name = "low"
+        elif value <= 2/3: name = "medium"
+        else: name  = "high"
+        icon.set_from_icon_name(f"audio-volume-{name}-symbolic")
+
+
 class Controls(Gtk.Box):
     def __init__(self):
         Gtk.Box.__init__(self)

audio/test_controls.py

@@ -4,6 +4,7 @@ from gi.repository import GObject
 from gi.repository import Gtk
 from gi.repository import Gst
 from . import controls
+from . import scale
 
 class FakePlayer(GObject.GObject):
     def __init__(self):
@@ -11,9 +12,11 @@ class FakePlayer(GObject.GObject):
         self.prev = False
         self.nxt = False
         self.play = False
+        self.vol = 1.0
 
     def previous(self): self.prev = True
     def next(self): self.nxt = True
+    def get_volume(self): return self.vol
     def playpause(self):
         states = { True : Gst.State.PLAYING, False : Gst.State.PAUSED }
         self.play = not self.play
@@ -72,6 +75,35 @@ class TestPlayPauseButton(unittest.TestCase):
         self.assertEqual(play.get_icon_name(), "media-playback-start")
 
 
+class TestControlScaleBox(unittest.TestCase):
+    def test_control_scale_box(self):
+        splus = scale.ScalePlus(1, 10, 1, 5)
+        ctrlbox = controls.ControlScaleBox(splus)
+        self.assertIsInstance(ctrlbox, scale.ScaleButtonBox)
+        self.assertIsInstance(ctrlbox.get_first_child(), Gtk.Image)
+        self.assertTrue(ctrlbox.get_first_child().has_css_class("large-icons"))
+
+
+class TestVolumeControlbox(unittest.TestCase):
+    def test_volume_control_box(self):
+        fake = FakePlayer()
+        vcb  = controls.VolumeControlBox(fake)
+        icon = vcb.get_first_child()
+        volume = icon.get_next_sibling().scale
+
+        self.assertIsInstance(vcb, controls.ControlScaleBox)
+        self.assertIsInstance(volume, scale.VolumeScale)
+
+        volume.set_value(0)
+        self.assertEqual(icon.get_icon_name(), "audio-volume-muted-symbolic")
+        volume.set_value(0.3)
+        self.assertEqual(icon.get_icon_name(), "audio-volume-low-symbolic")
+        volume.set_value(0.6)
+        self.assertEqual(icon.get_icon_name(), "audio-volume-medium-symbolic")
+        volume.set_value(0.9)
+        self.assertEqual(icon.get_icon_name(), "audio-volume-high-symbolic")
+
+
 class TestControls(unittest.TestCase):
     def test_controls_init(self):
         ctrl = controls.Controls()