statusicon.py 文件源码

def _load_fallback(self):
        status_icon_backends = [StatusIconAppIndicator, StatusIconDummy]

        if not self._status_fb:
            for StatusIconBackend in status_icon_backends:
                try:
                    self._status_fb = StatusIconBackend(*self._arguments[0], **self._arguments[1])
                    self._status_fb.connect(b"clicked",        self._on_click)
                    self._status_fb.connect(b"notify::active", self._on_notify_active_fb)
                    self._on_notify_active_fb()

                    log.warning("StatusIcon: Using backend %s (fallback)" % StatusIconBackend.__name__)
                    break
                except NotImplementedError:
                    continue

            # At least the dummy backend should have been loaded at this point...
            assert self._status_fb

        # Update fallback icon
        self.set(self._icon, self._text)