phantomcastle: add background music

pygame-wasm/phantomcastle/sound.py

@@ -0,0 +1,37 @@
+import pygame
+from common import SingletonMeta
+
+
+class BackgroundSound(pygame.mixer.Sound, metaclass=SingletonMeta):
+    def __init__(self, filename):
+        super().__init__(filename)
+        self.set_volume(0.5)
+        self._muted = False
+        self._played = False
+
+    def play(self):
+        if not self._played:
+            super().play(loops=-1)
+            self._played = True
+
+    def mute(self):
+        self._muted = True
+        self.set_volume(0)
+
+    def unmute(self):
+        self._muted = False
+        self.set_volume(0.5)
+
+    @property
+    def muted(self):
+        return self._muted
+
+    @muted.setter
+    def muted(self, value):
+        if value:
+            self.mute()
+        else:
+            self.unmute()
+
+    def toggle_mute(self):
+        self.muted = not self.muted