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# -*- coding: utf-8 -*- |
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# ----------------------------------------------------------------------------- |
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# Copyright (c) 2015 Yann Lanthony |
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# Copyright (c) 2017-2018 Spyder Project Contributors |
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# |
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# Licensed under the terms of the MIT License |
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# (See LICENSE.txt for details) |
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# ----------------------------------------------------------------------------- |
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"""Contains the Qt implementation of the Watcher api.""" |
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# yapf: disable |
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from __future__ import absolute_import |
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# Local imports |
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from qtsass.watchers.polling import PollingWatcher |
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# We cascade through Qt bindings here rather than relying on a comprehensive |
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# Qt compatability library like qtpy or Qt.py. This prevents us from forcing a |
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# specific compatability library on users. |
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QT_BINDING = None |
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if not QT_BINDING: |
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try: |
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from PySide2.QtWidgets import QApplication |
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from PySide2.QtCore import QObject, Signal |
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QT_BINDING = 'pyside2' |
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except ImportError: |
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pass |
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if not QT_BINDING: |
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try: |
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from PyQt5.QtWidgets import QApplication |
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from PyQt5.QtCore import QObject |
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from PyQt5.QtCore import pyqtSignal as Signal |
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QT_BINDING = 'pyqt5' |
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except ImportError: |
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pass |
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if not QT_BINDING: |
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try: |
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from PySide.QtGui import QApplication |
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from PySide2.QtCore import QObject, Signal |
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QT_BINDING == 'pyside' |
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except ImportError: |
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pass |
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if not QT_BINDING: |
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from PyQt4.QtGui import QApplication |
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from PyQt4.QtCore import QObject |
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from PyQt4.QtCore import pyqtSignal as Signal |
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QT_BINDING == 'pyqt4' |
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# yapf: enable |
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class QtDispatcher(QObject): |
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"""Used by QtWatcher to dispatch callbacks in the main ui thread.""" |
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signal = Signal() |
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class QtWatcher(PollingWatcher): |
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"""The Qt implementation of the Watcher api. |
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Subclasses PollingWatcher but dispatches :meth:`compile_and_dispatch` |
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using a Qt Signal to ensure that these calls are executed in the main ui |
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thread. We aren't using a QFileSystemWatcher because it fails to report |
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changes in certain circumstances. |
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""" |
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_qt_binding = QT_BINDING |
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def setup(self): |
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"""Set up QtWatcher.""" |
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super(QtWatcher, self).setup() |
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self._qtdispatcher = None |
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@property |
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def qtdispatcher(self): |
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"""Get the QtDispatcher.""" |
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if self._qtdispatcher is None: |
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self._qtdispatcher = QtDispatcher() |
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self._qtdispatcher.signal.connect(self.compile_and_dispatch) |
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return self._qtdispatcher |
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def on_change(self): |
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"""Call when a change is detected.""" |
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self._log.debug('Change detected...') |
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# If a QApplication event loop has not been started |
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# call compile_and_dispatch in the current thread. |
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if not QApplication.instance(): |
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return super(PollingWatcher, self).compile_and_dispatch() |
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# Create and use a QtDispatcher to ensure compile and any |
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# connected callbacks get executed in the main gui thread. |
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self.qtdispatcher.signal.emit() |
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spyder-ide /
qtsass
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