如何在Python PySide2(用于Python的Qt)中将windows光标设置为沙漏(等待)[重复]

我想 QApplication.setOverrideCursor 这就是你想要的:

PyQt5 :

from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication
...
QApplication.setOverrideCursor(Qt.WaitCursor)
# do lengthy process
QApplication.restoreOverrideCursor()

PyQt4 :

from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication
...
QApplication.setOverrideCursor(Qt.WaitCursor)
# do lengthy process
QApplication.restoreOverrideCursor()

虽然Cameron和David的答案非常适合在整个函数上设置等待光标,但我发现上下文管理器最适合为代码片段设置等待光标:

from contextlib import contextmanager
from PyQt4 import QtCore
from PyQt4.QtGui import QApplication, QCursor

@contextmanager
def wait_cursor():
    try:
        QApplication.setOverrideCursor(QCursor(QtCore.Qt.WaitCursor))
        yield
    finally:
        QApplication.restoreOverrideCursor()

然后将冗长的流程代码放入with块:

with wait_cursor():
    # do lengthy process
    pass

Ekhumaro的解决方案是正确的。这个解决方案是为了风格而修改的。我使用了ekhumor的功能,但使用了python装饰器。

from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication, QCursor, QMainWidget

def waiting_effects(function):
    def new_function(self):
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        try:
            function(self)
        except Exception as e:
            raise e
            print("Error {}".format(e.args[0]))
        finally:
            QApplication.restoreOverrideCursor()
    return new_function

我可以用任何我想让微调器激活的方法来设置装饰器。

class MyWigdet(QMainWidget):

    # ...

    @waiting_effects
    def doLengthyProcess(self):
        # do lengthy process
        pass

这样更好:

def waiting_effects(function):
    def new_function(*args, **kwargs):
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        try:
            return function(*args, **kwargs)
        except Exception as e:
            raise e
            print("Error {}".format(e.args[0]))
        finally:
            QApplication.restoreOverrideCursor()
    return new_function

根据我的说法,添加光标的最佳方法是使用装饰器。通过这种方式,只需将光标作为装饰器添加到该函数中,就可以运行任何函数

import decorator
@decorator.decorator
def showWaitCursor(func, *args, **kwargs):
    QtWidgets.QApplication.setOverrideCursor(QtCore.Qt.WaitCursor)
    try:
        return func(*args, **kwargs)
    finally:
        QtWidgets.QApplication.restoreOverrideCursor()

@showWaitCursor
def youFunc():
    # Long process

我发现我经常需要做:

QApplication.setOverrideCursor(Qt.WaitCursor)
QApplication.ProcessEvents()
...
QApplication.restoreOverrideCursor()

然而在GUI初始化期间,我发现出于某些原因需要进行修改:

self.ui.show()  # Or your equivalent code to show the widget
QApplication.processEvents()
QApplication.setOverrideCursor(Qt.WaitCursor)
app.processEvents()
...
QApplication.restoreOverrideCursor()

否则,直到鼠标经过修改它的小部件(如QLineEdit)时,光标才会“恢复”,这与@Guimoute提到的类似

您可以使用QgsTemporaryCursorOverride类 https://qgis.org/api/classQgsTemporaryCursorOverride.html

但在Python中,您应该使用PyQGIS中现在包含的Python上下文管理器:

from qgis.PyQt.QtCore import Qt
from qgis.utils import OverrideCursor

with OverrideCursor(Qt.WaitCursor):
    do_a_slow(operation)