code release

xlib/mp/csw/Flag.py

@@ -0,0 +1,62 @@
+from xlib.python import EventListener
+
+from .CSWBase import ControlClient, ControlHost
+
+
+class _FlagBase:
+    def __init__(self):
+        self._flag = None
+        self._on_flag_evl = EventListener()
+
+        self._call_on_msg('flag', self._on_msg_flag)
+
+    def _on_msg_flag(self, flag):
+        self._set_flag(flag)
+
+    def _send_flag(self):
+        self._send_msg('flag', self._flag)
+
+    def _set_flag(self, flag : bool):
+        if flag is not None and not isinstance(flag, bool):
+            raise ValueError('flag must be a bool value or None')
+
+        if self._flag != flag:
+            self._flag = flag
+            self._on_flag_evl.call(flag if flag is not None else False)
+            return True
+        return False
+
+    def call_on_flag(self, func):
+        """Call when the flag is changed"""
+        self._on_flag_evl.add(func)
+
+    def set_flag(self, flag : bool):
+        if self._set_flag(flag):
+            self._send_flag()
+
+    def get_flag(self): return self._flag
+
+class Flag:
+    """
+    Flag control.
+
+    Values:  None   : uninitialized/not set
+             bool   : value
+    """
+    class Host(ControlHost, _FlagBase):
+        def __init__(self):
+            ControlHost.__init__(self)
+            _FlagBase.__init__(self)
+
+        def _on_msg_flag(self, flag):
+            if self.is_enabled():
+                _FlagBase._on_msg_flag(self, flag)
+            self._send_flag()
+
+    class Client(ControlClient, _FlagBase):
+        def __init__(self):
+            ControlClient.__init__(self)
+            _FlagBase.__init__(self)
+
+        def _on_reset(self):
+            self._set_flag(None)