Make progress bar cursor draggable

zidoo.py

@@ -16,6 +16,11 @@ import urllib.parse
 import urllib.request
 
 
+class ZidooError(RuntimeError):
+    """The Zidoo did not do what it was asked -- off, unreachable, or with
+    nothing loaded to do it to."""
+
+
 class ZidooClient:
     def __init__(self, host, port=9529, timeout=1.5):
         self.base_url = f"http://{host}:{port}"
@@ -65,6 +70,15 @@ class ZidooClient:
             track["duration_ms"] = video["duration"]
         return track
 
+    def seek(self, position_ms):
+        """Jump the loaded video to position_ms. Unlike now_playing(), this
+        is something someone asked for, so a Zidoo that does not answer is
+        an error rather than simply nothing to show."""
+        # "positon" [sic] is the Zidoo's own spelling.
+        payload = self._get_json("ZidooVideoPlay/seekTo", positon=int(position_ms))
+        if not payload or payload.get("status") != 200:
+            raise ZidooError("The Zidoo did not seek -- is a film still loaded on it?")
+
     def _film(self, path):
         """The poster wall's entry for the film a file belongs to -- its
         "id" (which is also its poster's) and "year" among the rest -- or {}