Source code for pyqtgraph.widgets.BusyCursor

from contextlib import contextmanager

from ..Qt import QtCore, QtGui, QtWidgets

__all__ = ["BusyCursor"]

[docs] @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()