framelesswindowhint 导致 qmenu 无法正常工作

Posted 2023-02-14

【中文标题】framelesswindowhint 导致 qmenu 无法正常工作

【英文标题】：framelesswindowhint causes qmenu to not working correctly

【发布时间】：2019-02-17 15:39:46

【问题描述】：

我是 pyqt 的新手。我想摆脱 qmenu 阴影。但是当我添加 framelesswindowhint 时，菜单无法正常工作。

实现无框窗口之前的代码：

import sys
from PyQt5 import QtWidgets, QtCore, QtGui


class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setMinimumSize(800, 400)
        self.setStyleSheet(
            """
        background-color:white;
        """
        )
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.mainlayout = QtWidgets.QVBoxLayout()

        button = QtWidgets.QPushButton("my button")
        filemenu = QtWidgets.QMenu(button)
        #filemenu.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        filemenu.setObjectName("filemenu")
        openaction = QtWidgets.QAction("open item", self)
        filemenu.addAction(openaction)
        button.setMenu(filemenu)
        self.mainlayout.addWidget(button)
        self.setLayout(self.mainlayout)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    # app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
    mw = MainWindow()
    # mw.setWindowOpacity(0.95)
    mw.show()
    sys.exit(app.exec_())

输出：（单击按钮）：

取消注释后： （未点击按钮）

（点击按钮）

【参考方案1】：

Qt.NoDropShadowWindowHint 禁用支持平台上的窗口投影。

import sys
from PyQt5 import QtWidgets, QtCore, QtGui


class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        self.label = QtWidgets.QLabel(self, alignment=QtCore.Qt.AlignCenter)
        button = QtWidgets.QPushButton("my button")

        filemenu = QtWidgets.QMenu(button)
        filemenu.triggered.connect(self.selected)

        #filemenu.setWindowFlags(QtCore.Qt.FramelessWindowHint)         #  ---                  
        filemenu.setWindowFlags(filemenu.windowFlags()                  #  +++
                                | QtCore.Qt.NoDropShadowWindowHint)     #  +++

        openaction = QtWidgets.QAction("open item", self)
        filemenu.addAction(openaction)
        filemenu.addAction("Do something...") 

        button.setMenu(filemenu)

        self.mainlayout = QtWidgets.QVBoxLayout()
        self.mainlayout.addStretch()
        self.mainlayout.addWidget(self.label)
        self.mainlayout.addWidget(button)
        self.mainlayout.addStretch()
        self.setLayout(self.mainlayout)

    def selected(self, q):
        self.label.setText(q.text() + ' selected')


CSS = """
QWidget 
    background-color: white;  


QMenu 
    background-color: #ABABAB; /* sets background of the menu */
    border: 1px solid black;  
    margin: 0;   


QMenu::item 
    background-color: red; 


QMenu::item:selected  
    background-color: #654321;


QMenu::separator 
    height: 12px;
    background: lightblue;
    margin-left: 10px;
    margin-right: 5px;


QLabel  
color: red;
font: 27px;
 

QPushButton 
    background-color: yellow;  

""" 

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    # app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
    app.setStyleSheet(CSS)
    mw = MainWindow()
    # mw.setWindowOpacity(0.95)
    mw.setMinimumSize(800, 400)
    mw.show()
    sys.exit(app.exec_())