PyQt5：使用不透明的小部件创建透明窗口

Question

是否可以使 mainWindow 完全透明而其他小部件保持可见？例如：我想让应用程序透明并使其他所有内容可见（例如，mainFrame、关闭按钮、最小化按钮）

Answer 1

您可以使用 window.setAttribute(QtCore.Qt.WA_TranslucentBackground) 这里是一个小例子：

import sys

from PyQt5 import QtWidgets, QtCore

app = QtWidgets.QApplication(sys.argv)

# create invisble widget

window = QtWidgets.QWidget()

window.setAttribute(QtCore.Qt.WA_TranslucentBackground)

window.setWindowFlags(QtCore.Qt.FramelessWindowHint)

window.setFixedSize(800, 600)

# add visible child widget, when this widget is transparent it will also be invisible

visible_child = QtWidgets.QWidget(window)

visible_child.setStyleSheet('QWidget{background-color: white}')

visible_child.setObjectName('vc')

visible_child.setFixedSize(800, 600)

layout = QtWidgets.QGridLayout()

# add a close button

close_button = QtWidgets.QPushButton()

close_button.setText('close window')

close_button.clicked.connect(lambda: app.exit(0))

layout.addWidget(close_button)

# add a button that makes the visible child widget transparent

change_size_button = QtWidgets.QPushButton()

change_size_button.setText('change size')

change_size_button.clicked.connect(lambda: visible_child.setStyleSheet('QWidget#vc{background-color: transparent}'))

layout.addWidget(change_size_button)

visible_child.setLayout(layout)

window.show()

app.exec()