Python 如何通过整个主窗口将CSS样式应用于QMenu

运行下面的示例代码将创建一个单按钮窗口。向上单击按钮将显示一个下拉菜单

当CSS“appStyle”直接应用于

菜单时，它似乎运行良好：

menu.setStyleSheet(appStyle)

但当使用以下命令将相同CSS“appStyle”分配给整个窗口时：

view.setStyleSheet(appStyle)

什么也没发生（只需注释掉
菜单.setStyleSheet（appStyle）
即可查看）。
如果CSS样式表只用于整个视图，而不是单独用于每个菜单或每个小部件，那就太好了。如何实现

bgColor='#1F1F1F'
appStyle="""
QMenu {{  font-size:10pt; selection-background-color: #ffaa00; selection-color: black; background-color: #7A7A7A; border-style: solid; border: 0px solid #EBEBEB; border-radius: 0; color: #EBEBEB; padding: 0px 0px 0px 0px; }}
QMenu:on  {{padding-top: 0px; padding-left: 0px; background-color: #7A7A7A; selection-background-color: #ffaa00; color: #EBEBEB; border-radius: 0;}}
QMenu QAbstractItemView  {{ border: 0px solid black; background-color: #7A7A7A; color: #EBEBEB; border-radius: 0; }}
QMenu:hover {{ border: 0px solid #ffa02f; }}
QMenu::drop-down  {{ border-radius: 0px; background-color: #7A7A7A; color: #EBEBEB; }}""".format(bgColor) 


from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__() 
        button=QToolButton(self)
        button.setText('Click Here')

        menu=QMenu()
        menu.addAction("Action01")
        menu.addAction("Action02")
        menu.addAction("Action03")

        separator=menu.addAction("")
        separator.setSeparator(True)

        subMenu=menu.addMenu('SubMenu')
        subMenu.addAction("SubAction01")
        subMenu.addAction("SubAction02")
        subMenu.addAction("SubAction03")   

        button.setMenu(menu)
        button.setPopupMode(QToolButton.InstantPopup)
        menu.setStyleSheet(appStyle)   


app=QApplication(sys.argv)    
view=Window() 
view.setStyleSheet(appStyle)
view.show()
sys.exit(app.exec_())

在
QMenu
声明上传递查看
self
的实例。
因此，不是：

menu=QMenu()

做：

现在，当一个样式表被应用到主窗口时，它的样式表会向下传播到它的子窗口中——在本例中是
菜单
和
按钮
实例


工作代码如下：

bgColor='#1F1F1F'
appStyle="""
QToolButton {{border: 0px solid #0F0F0F; background-color: QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #7A7A7A, stop: 1 #0F0F0F); color: #EBEBEB}}
QMenu QAbstractItemView  {{ border: 0px solid black; background-color: #7A7A7A; color: #EBEBEB; border-radius: 0; }}
QMenu {{  font-size:10pt; selection-background-color: #ffaa00; selection-color: black; background-color: #7A7A7A; border-style: solid; border: 0px solid #EBEBEB; border-radius: 0; color: #EBEBEB; padding: 0px 0px 0px 0px; }}
QMenu:on  {{padding-top: 0px; padding-left: 0px; background-color: #7A7A7A; selection-background-color: #ffaa00; color: #EBEBEB; border-radius: 0;}}
QMenu:hover {{ border: 0px solid #ffa02f; }}
QMenu::drop-down  {{ border-radius: 0px; background-color: #7A7A7A; color: #EBEBEB; }}""".format(bgColor) 

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__() 
        button=QToolButton(self)
        button.setText('Click Here')

        menu=QMenu(self)
        menu.addAction("Action01")
        menu.addAction("Action02")
        menu.addAction("Action03")

        separator=menu.addAction("")
        separator.setSeparator(True)

        subMenu=menu.addMenu('SubMenu')
        subMenu.addAction("SubAction01")
        subMenu.addAction("SubAction02")
        subMenu.addAction("SubAction03")   

        button.setMenu(menu)
        button.setPopupMode(QToolButton.InstantPopup)

app=QApplication(sys.argv)
view=Window() 
view.setStyleSheet(appStyle)
view.show()
sys.exit(app.exec_())

bgColor='#1F1F1F'
appStyle="""
QToolButton {{border: 0px solid #0F0F0F; background-color: QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #7A7A7A, stop: 1 #0F0F0F); color: #EBEBEB}}
QMenu QAbstractItemView  {{ border: 0px solid black; background-color: #7A7A7A; color: #EBEBEB; border-radius: 0; }}
QMenu {{  font-size:10pt; selection-background-color: #ffaa00; selection-color: black; background-color: #7A7A7A; border-style: solid; border: 0px solid #EBEBEB; border-radius: 0; color: #EBEBEB; padding: 0px 0px 0px 0px; }}
QMenu:on  {{padding-top: 0px; padding-left: 0px; background-color: #7A7A7A; selection-background-color: #ffaa00; color: #EBEBEB; border-radius: 0;}}
QMenu:hover {{ border: 0px solid #ffa02f; }}
QMenu::drop-down  {{ border-radius: 0px; background-color: #7A7A7A; color: #EBEBEB; }}""".format(bgColor) 

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__() 
        button=QToolButton(self)
        button.setText('Click Here')

        menu=QMenu(self)
        menu.addAction("Action01")
        menu.addAction("Action02")
        menu.addAction("Action03")

        separator=menu.addAction("")
        separator.setSeparator(True)

        subMenu=menu.addMenu('SubMenu')
        subMenu.addAction("SubAction01")
        subMenu.addAction("SubAction02")
        subMenu.addAction("SubAction03")   

        button.setMenu(menu)
        button.setPopupMode(QToolButton.InstantPopup)

app=QApplication(sys.argv)
view=Window() 
view.setStyleSheet(appStyle)
view.show()
sys.exit(app.exec_())