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