Example #1
0
    def __init__(self, queue=None, rqueue=None):
        from tugalinhas.turtlescene import TurtleScene, TurtleView

        super().__init__()
        self._scene = TurtleScene()
        self._view = TurtleView(self._scene)
        self._layout = QtWidgets.QVBoxLayout(self)
        self._layout.addWidget(self._view)
        self.setMinimumSize(800, 600)
        self._namespace = self._scene.getNamespace()
        self._queue = queue
        self._rqueue = rqueue
        self.startTimer(1000 / 30)
Example #2
0
class _TurtleWindow(QtWidgets.QWidget):
    """
    A turtle window that should be ran in a background subprocess.
    We cannot use threads since Qt expects that the GUI runs in the main thread.

    It communicates with the main process using a Queue of commands.
    """
    _instance = None

    def __new__(cls, queue=None, rqueue=None):
        if cls._instance is None:
            return super().__new__(cls, queue, rqueue)
        else:
            return cls._instance

    def __init__(self, queue=None, rqueue=None):
        from tugalinhas.turtlescene import TurtleScene, TurtleView

        super().__init__()
        self._scene = TurtleScene()
        self._view = TurtleView(self._scene)
        self._layout = QtWidgets.QVBoxLayout(self)
        self._layout.addWidget(self._view)
        self.setMinimumSize(800, 600)
        self._namespace = self._scene.getNamespace()
        self._queue = queue
        self._rqueue = rqueue
        self.startTimer(1000 / 30)

    def timerEvent(self, timer):
        if not self._queue.empty():
            task = self._queue.get()
            self.consume(task)

    def keyPressEvent(self, ev):
        key = ev.key()
        modifiers = ev.modifiers()

    def consume(self, task):
        name, args, kwargs = task
        if name.startswith('*'):
            method = getattr(self._namespace, name[1:])
            self._rqueue.put(method(*args, **kwargs))
        else:
            method = getattr(self._namespace, name)
            method(*args, **kwargs)