How to set control transparency in pyqt5

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Release： 2021-04-22 18:24:01

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pyqt5 Set control transparency method: first use the QGraphicsOpacityEffect class to set the transparency effect of the graphic element; then use "element name.setOpacity (transparent value)" to set the transparency of the element, the parameter value is between 0 and "1.0" That’s it.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

PyQT sets control transparency

PyQT5 sets Opacity for the control, method: QGraphicsOpacityEffect

In the following sample code, myshow is a QPushButton, and the method for setting transparency is as follows :

op = QtWidgets.QGraphicsOpacityEffect()
op.setOpacity(0.5)
myshow.setGraphicsEffect(op)
myshow.setAutoFillBackground(True)

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Complete example, you can paste it directly and use it:

from PyQt5 import QtWidgets, QtCore
import sys
from PyQt5.QtCore import *
import time


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    myshow = QtWidgets.QPushButton('Button')

    myshow.setStyleSheet("""
        padding-left: 10px;
        padding-right: 10px;
        padding-top: 1px;
        padding-bottom: 1px;
        border:1px solid #0073df;
        border-radius:5px;
        background: #167ce9;
        color: #fff;
    """)

    def changeOpacity(_):
        op = QtWidgets.QGraphicsOpacityEffect()
        op.setOpacity(0.5)
        myshow.setGraphicsEffect(op)
        myshow.setAutoFillBackground(True)

    myshow.clicked.connect(changeOpacity)

    layout = QtWidgets.QVBoxLayout()
    layout.addWidget(myshow)
    
    main = QtWidgets.QWidget()
    main.setLayout(layout)
    main.show()
    sys.exit(app.exec_())

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