Enable seeking to specific points in the current song

src/mpd_now_playable/cocoa/now_playing.py

@@ -4,6 +4,7 @@ from pathlib import Path
 from AppKit import NSCompositingOperationCopy, NSImage, NSMakeRect
 from Foundation import CGSize, NSMutableDictionary
 from MediaPlayer import (
+	MPChangePlaybackPositionCommandEvent,
 	MPMediaItemArtwork,
 	MPMediaItemPropertyAlbumTitle,
 	MPMediaItemPropertyAlbumTrackNumber,
@@ -31,6 +32,7 @@ from MediaPlayer import (
 	MPRemoteCommandCenter,
 	MPRemoteCommandEvent,
 	MPRemoteCommandHandlerStatus,
+	MPRemoteCommandHandlerStatusSuccess,
 )
 
 from ..async_tools import run_background_task
@@ -138,13 +140,17 @@ class CocoaNowPlaying:
 			cmd.removeTarget_(None)
 			cmd.addTargetWithHandler_(self._create_handler(handler))
 
+		seekCmd = self.cmd_center.changePlaybackPositionCommand()
+		seekCmd.setEnabled_(True)
+		seekCmd.removeTarget_(None)
+		seekCmd.addTargetWithHandler_(self._create_seek_handler(player.on_seek))
+
 		unsupported_cmds = (
 			self.cmd_center.changePlaybackRateCommand(),
 			self.cmd_center.seekBackwardCommand(),
 			self.cmd_center.skipBackwardCommand(),
 			self.cmd_center.seekForwardCommand(),
 			self.cmd_center.skipForwardCommand(),
-			self.cmd_center.changePlaybackPositionCommand(),
 		)
 		for cmd in unsupported_cmds:
 			cmd.setEnabled_(False)
@@ -175,3 +181,14 @@ class CocoaNowPlaying:
 			return 0
 
 		return handler
+
+	def _create_seek_handler(
+		self, player: Callable[[float], Coroutine[None, None, None]]
+	) -> Callable[[MPChangePlaybackPositionCommandEvent], MPRemoteCommandHandlerStatus]:
+		def handler(
+			event: MPChangePlaybackPositionCommandEvent,
+		) -> MPRemoteCommandHandlerStatus:
+			run_background_task(player(event.positionTime()))
+			return MPRemoteCommandHandlerStatusSuccess
+
+		return handler

src/mpd_now_playable/mpd/listener.py

@@ -126,3 +126,6 @@ class MpdStateListener(Player):
 
 	async def on_prev(self) -> None:
 		await self.client.previous()
+
+	async def on_seek(self, position: float) -> None:
+		await self.client.seekcur(position)

src/mpd_now_playable/player.py

@@ -21,3 +21,6 @@ class Player(Protocol):
 
 	async def on_prev(self) -> None:
 		...
+
+	async def on_seek(self, position: float) -> None:
+		...

stubs/MediaPlayer/__init__.pyi

@@ -1,5 +1,5 @@
 from collections.abc import Callable
-from typing import Final, Literal
+from typing import Final, Literal, override
 
 from AppKit import NSImage
 from Foundation import CGSize, NSMutableDictionary
@@ -52,18 +52,34 @@ class MPNowPlayingInfoCenter:
 	def setNowPlayingInfo_(self, info: NSMutableDictionary) -> None: ...
 	def setPlaybackState_(self, state: MPMusicPlaybackState) -> None: ...
 
-MPRemoteCommandHandlerStatusSuccess: Literal[0] = 0
-MPRemoteCommandHandlerStatusCommandFailed: Literal[200] = 200
+MPRemoteCommandHandlerStatusSuccess: Final = 0
+MPRemoteCommandHandlerStatusCommandFailed: Final = 200
 MPRemoteCommandHandlerStatus = Literal[0, 200]
 
 class MPRemoteCommandEvent:
 	pass
 
+class MPChangePlaybackPositionCommandEvent(MPRemoteCommandEvent):
+	def positionTime(self) -> float:
+		"""Return the requested playback position as a number of seconds (fractional seconds are allowed)."""
+		pass
+
 class MPRemoteCommand:
 	def setEnabled_(self, enabled: bool) -> None: ...
 	def removeTarget_(self, target: object) -> None: ...
 	def addTargetWithHandler_(
 		self, handler: Callable[[MPRemoteCommandEvent], MPRemoteCommandHandlerStatus]
+	) -> None:
+		"""Register a callback to handle the commands. Many remote commands don't carry useful information in the event object (play, pause, next track, etc.), so the callback does not necessarily need to care about the event argument."""
+		pass
+
+class MPChangePlaybackPositionCommand(MPRemoteCommand):
+	@override
+	def addTargetWithHandler_(
+		self,
+		handler: Callable[
+			[MPChangePlaybackPositionCommandEvent], MPRemoteCommandHandlerStatus
+		],
 	) -> None: ...
 
 class MPRemoteCommandCenter:
@@ -80,4 +96,4 @@ class MPRemoteCommandCenter:
 	def skipBackwardCommand(self) -> MPRemoteCommand: ...
 	def seekForwardCommand(self) -> MPRemoteCommand: ...
 	def skipForwardCommand(self) -> MPRemoteCommand: ...
-	def changePlaybackPositionCommand(self) -> MPRemoteCommand: ...
+	def changePlaybackPositionCommand(self) -> MPChangePlaybackPositionCommand: ...

stubs/mpd/asyncio.pyi

@@ -5,19 +5,22 @@ from mpd.base import MPDClientBase
 from mpd_now_playable.mpd import types
 
 class MPDClient(MPDClientBase):
-    mpd_version: str | None
+	mpd_version: str | None
 
-    def __init__(self) -> None: ...
-    async def connect(self, host: str, port: int = ...) -> None: ...
-    async def password(self, password: str) -> None: ...
-    def idle(self, subsystems: Sequence[str] = ...) -> AsyncIterator[Sequence[str]]: ...
-
-    async def status(self) -> types.StatusResponse: ...
-    async def currentsong(self) -> types.CurrentSongResponse: ...
-    async def readpicture(self, uri: str) -> types.ReadPictureResponse: ...
-
-    async def play(self) -> None: ...
-    async def pause(self, pause: Literal[1, 0, None] = None) -> None: ...
-    async def stop(self) -> None: ...
-    async def next(self) -> None: ... # noqa: A003
-    async def previous(self) -> None: ...
+	def __init__(self) -> None: ...
+	async def connect(self, host: str, port: int = ...) -> None: ...
+	async def password(self, password: str) -> None: ...
+	def idle(self, subsystems: Sequence[str] = ...) -> AsyncIterator[Sequence[str]]: ...
+	async def status(self) -> types.StatusResponse: ...
+	async def currentsong(self) -> types.CurrentSongResponse: ...
+	async def readpicture(self, uri: str) -> types.ReadPictureResponse: ...
+	async def play(self) -> None: ...
+	async def pause(self, pause: Literal[1, 0, None] = None) -> None:
+		"""Pause MPD or toggle its play/pause state. Pass pause=1 to unconditionally pause, pause=0 to unconditionally unpause, or pause=None to toggle."""
+		pass
+	async def stop(self) -> None: ...
+	async def next(self) -> None: ...  # noqa: A003
+	async def previous(self) -> None: ...
+	async def seekcur(self, position: float) -> None:
+		"""Seek to a particular time in the currently playing song, measured in seconds. Fractional seconds are supported."""
+		pass