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from contextlib import contextmanager
from ..Qt import QtCore, QtGui, QtWidgets
__all__ = ["BusyCursor"]
@contextmanager
def BusyCursor():
"""
Display a busy mouse cursor during long operations.
Usage::
with BusyCursor():
doLongOperation()
May be nested. If called from a non-gui thread, then the cursor will not be affected.
"""
app = QtCore.QCoreApplication.instance()
in_gui_thread = (app is not None) and (QtCore.QThread.currentThread() == app.thread())
try:
if in_gui_thread:
guard = QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.CursorShape.WaitCursor))
# on PySide6 6.3.0, setOverrideCursor() returns a QOverrideCursorGuard object
# that, on its destruction, calls restoreOverrideCursor() if the user had not
# already done so.
# if the user wants to call it manually, they must do it via the returned object,
# and not via the QtWidgets.QApplication static method; otherwise the restore
# would get called twice.
yield
finally:
if in_gui_thread:
if hasattr(guard, 'restoreOverrideCursor'):
guard.restoreOverrideCursor()
else:
QtWidgets.QApplication.restoreOverrideCursor()
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