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from ..Qt import QtGui, QtCore, QT_LIB
__all__ = ['BusyCursor']
class BusyCursor(object):
"""Class for displaying a busy mouse cursor during long operations.
Usage::
with pyqtgraph.BusyCursor():
doLongOperation()
May be nested. If called from a non-gui thread, then the cursor will not be affected.
"""
active = []
def __enter__(self):
app = QtCore.QCoreApplication.instance()
isGuiThread = (app is not None) and (QtCore.QThread.currentThread() == app.thread())
if isGuiThread and QtGui.QApplication.instance() is not None:
if QT_LIB == 'PySide':
# pass CursorShape rather than QCursor for PySide
# see https://bugreports.qt.io/browse/PYSIDE-243
QtGui.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
else:
QtGui.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.WaitCursor))
BusyCursor.active.append(self)
self._active = True
else:
self._active = False
def __exit__(self, *args):
if self._active:
BusyCursor.active.pop(-1)
if len(BusyCursor.active) == 0:
QtGui.QApplication.restoreOverrideCursor()
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