Why can't the button be set size and other styles?

q&a
,
1

Why can’t the button be set size and other styles?
After using the design tool, the button control cannot be inherited because it cannot be sized.

from PyQt5.QtWidgets import *
from PyQt5.QtCore import QSize

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(345, 225)
        self.pushButton = QtWidgets.QPushButton(self)
        self.pushButton.setGeometry(QtCore.QRect(20, 30, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "PushButt"))

class MyButton(QPushButton):
    def __init__(self):
        super(MyButton, self).__init__()
        self.setStyleSheet("background:green")  #Writing this way will not produce practical results
        self.setFixedSize(QSize(10,10)) #Writing this way will not produce practical results

class Demo(Ui_Form,QWidget):
    def __init__(self,parent=None):
        super(Demo,self).__init__(parent)
        self.setupUi(self)
        self.btn = MyButton()
        self.btn.setFixedSize(QSize(100,20))  #Writing this way will not produce practical results

if __name__ == '__main__':
    app = QApplication([])
    w = Demo()
    w.show()
    sys.exit(app.exec_())

28

2

Hello!

The reason this is having no effect, is that this button is invisible. You have a Ui_Form with a button in it (self.pushButton). You then create a new button called self.btn and change the dimensions of that button, but because it isn’t added to a window, or a layout, it remains invisible.

For example

from PyQt5.QtWidgets import *
from PyQt5.QtCore import QSize

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(345, 225)
        self.pushButton = QtWidgets.QPushButton(self)
        # self.pushButton.setGeometry(QtCore.QRect(20, 30, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "PushButt"))


class Demo(Ui_Form,QWidget):
    def __init__(self,parent=None):
        super(Demo,self).__init__(parent)
        self.setupUi(self)
        # self.btn= MyButton() we don't create this button, instead modifying the existing one
        self.pushButton.setFixedSize(QSize(200,20))  #Writing this way will not produce practical results
         
        
if __name__ == '__main__':
    app = QApplication([])
    w = Demo()
    w.show()
    sys.exit(app.exec_())