Add native Linux controls and tray menu for BTD 700

btd700/worker.py

@@ -0,0 +1,67 @@
+"""One thread owns the USB handle; the GTK main loop never waits for USB."""
+import queue
+import threading
+from gi.repository import GLib
+from .controller import Controller
+from .transport import DeviceError, Hidraw, discover
+
+
+class Worker(threading.Thread):
+    def __init__(self, callback, *, device_path=None, demo=False):
+        super().__init__(name='btd700-usb', daemon=True)
+        self.callback = callback
+        self.device_path = device_path
+        self.demo = demo
+        self.commands = queue.Queue()
+        self.stopping = threading.Event()
+        self.controller = None
+        self.transport = None
+
+    def submit(self, method, args, kwargs):
+        self.commands.put((method, args, kwargs))
+
+    def stop(self):
+        self.stopping.set()
+        self.commands.put(None)
+
+    def run(self):
+        try:
+            while not self.stopping.is_set():
+                try:
+                    action = self.commands.get(timeout=2)
+                except queue.Empty:
+                    action = None
+                if self.stopping.is_set():
+                    break
+                error = ''
+                try:
+                    if self.controller is None:
+                        if self.demo:
+                            from .demo import DemoTransport
+                            self.transport = DemoTransport()
+                        else:
+                            devices = discover()
+                            if self.device_path:
+                                devices = [d for d in devices if d.path == self.device_path]
+                            if not devices:
+                                raise DeviceError('Kein BTD 700 gefunden. Bitte den Dongle einstecken.')
+                            if len(devices) > 1:
+                                raise DeviceError('Mehrere BTD 700 gefunden. Mit --device /dev/hidrawN auswählen.')
+                            self.transport = Hidraw(devices[0])
+                        self.controller = Controller(self.transport)
+                    if action:
+                        method, args, kwargs = action
+                        try:
+                            getattr(self.controller, method)(*args, **kwargs)
+                        except (ValueError, DeviceError, TimeoutError) as exc:
+                            error = str(exc)
+                    status = self.controller.snapshot()
+                    GLib.idle_add(self.callback, status, error, bool(action))
+                except Exception as exc:
+                    if self.transport:
+                        self.transport.close()
+                    self.transport = self.controller = None
+                    GLib.idle_add(self.callback, None, error or str(exc), bool(action))
+        finally:
+            if self.transport:
+                self.transport.close()