我想创建一个半透明背景的全屏窗口,但是完全可见的子窗口小部件(覆盖效果的种类).

这是我到目前为止所拥有的：

import sys

from PyQt5.QtCore import *

from PyQt5.QtGui import *

from PyQt5.QtWidgets import *

app = QApplication(sys.argv)

# Create the main window

window = QMainWindow()

window.setWindowOpacity(0.3)

window.setAttribute(Qt.WA_NoSystemBackground, True)

window.setWindowFlags(Qt.FramelessWindowHint)

# Create the button

pushButton = QPushButton(window)

pushButton.setGeometry(QRect(240, 190, 90, 31))

pushButton.setText("Finished")

pushButton.clicked.connect(app.quit)

# Center the button

qr = pushButton.frameGeometry()

cp = QDesktopWidget().availableGeometry().center()

qr.moveCenter(cp)

pushButton.move(qr.topLeft())

# Run the application

window.showFullScreen()

sys.exit(app.exec_())

这会产生半透明效果,但即使按钮也是半透明的.

我也试过替换了

window.setWindowOpacity(0.3)

通过这个电话

window.setAttribute(Qt.WA_TranslucentBackground, True)

但无济于事,在这种情况下,背景是完全透明的(按钮正确完全可见).

解决方案:(感谢Aaron的建议)：

诀窍在于为主窗口实现自定义paintEvent.

import sys

from PyQt5.QtCore import *

from PyQt5.QtGui import *

from PyQt5.QtWidgets import *

class CustomWindow(QMainWindow):

def paintEvent(self, event=None):

painter = QPainter(self)

painter.setOpacity(0.7)

painter.setBrush(Qt.white)

painter.setPen(QPen(Qt.white))

painter.drawRect(self.rect())

app = QApplication(sys.argv)

# Create the main window

window = CustomWindow()

window.setWindowFlags(Qt.FramelessWindowHint)

window.setAttribute(Qt.WA_NoSystemBackground, True)

window.setAttribute(Qt.WA_TranslucentBackground, True)

# Create the button

pushButton = QPushButton(window)

pushButton.setGeometry(QRect(240, 190, 90, 31))

pushButton.setText("Finished")

pushButton.clicked.connect(app.quit)

# Center the button

qr = pushButton.frameGeometry()

cp = QDesktopWidget().availableGeometry().center()

qr.moveCenter(cp)

pushButton.move(qr.topLeft())

# Run the application

window.showFullScreen()

sys.exit(app.exec_())