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:
+		...