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"""
A common interface for accessing backend UI functionality.
At the moment, the only backend is Qt
"""
from abc import abstractmethod
_backend = None
class TimerBase(object):
@abstractmethod
def __init__(self, interval, callback):
pass
@abstractmethod
def stop(self):
pass
@abstractmethod
def start(self):
pass
class QtTimer(TimerBase):
def __init__(self, interval, callback):
from qtpy import QtCore
self._timer = QtCore.QTimer()
self._timer.setInterval(interval)
self._timer.timeout.connect(callback)
def start(self):
self._timer.start()
def stop(self):
self._timer.stop()
def get_timer(backend='qt'):
if backend == 'qt':
return QtTimer
else:
raise ValueError("Only QT Backend supported")
def get_backend(backend='qt'):
global _backend
if _backend is not None:
return _backend
if backend != 'qt':
raise ValueError("Only QT Backend supported")
from glue.qt import qt_backend
_backend = qt_backend
return _backend
|
