[FIXED] PyQt5 - How to add a scrollbar to a QMessageBox

Issue

I have a list which is generated based on user-input.

I am trying to display this list in a QMessageBox. But, I have no way of knowing the length of this list. The list could be long.

Thus, I need to add a scrollbar to the QMessageBox.

Interestingly, I looked everywhere, but I haven’t found any solutions for this.

Below is, what I hope to be a “Minimal, Complete and Verifiable Example”, of course without the user input; I just created a list as an example.

I appreciate any advice.

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class W(QWidget):

   def __init__(self):
      super().__init__()

      self.initUi()

   def initUi(self):
      self.btn = QPushButton('Show Message', self)
      self.btn.setGeometry(10, 10, 100, 100)
      self.btn.clicked.connect(self.buttonClicked)
      self.lst = list(range(2000))
      self.show()


   def buttonClicked(self):
      result = QMessageBox(self)
      result.setText('%s' % self.lst)
      result.exec_()

if __name__ == "__main__":
   app = QApplication(sys.argv)
   gui = W()
   sys.exit(app.exec_())

Solution

You can not add a scrollbar directly since the widget in charge of displaying the text is a QLabel. The solution is to add a QScrollArea. The size may be inadequate so a stylesheet has to be used to set minimum values.

class ScrollMessageBox(QMessageBox):
   def __init__(self, l, *args, **kwargs):
      QMessageBox.__init__(self, *args, **kwargs)
      scroll = QScrollArea(self)
      scroll.setWidgetResizable(True)
      self.content = QWidget()
      scroll.setWidget(self.content)
      lay = QVBoxLayout(self.content)
      for item in l:
         lay.addWidget(QLabel(item, self))
      self.layout().addWidget(scroll, 0, 0, 1, self.layout().columnCount())
      self.setStyleSheet("QScrollArea{min-width:300 px; min-height: 400px}")

class W(QWidget):
   def __init__(self):
      super().__init__()
      self.btn = QPushButton('Show Message', self)
      self.btn.setGeometry(10, 10, 100, 100)
      self.btn.clicked.connect(self.buttonClicked)
      self.lst = [str(i) for i in range(2000)]
      self.show()


   def buttonClicked(self):
      result = ScrollMessageBox(self.lst, None)
      result.exec_()

if __name__ == "__main__":
   app = QApplication(sys.argv)
   gui = W()
   sys.exit(app.exec_())

Output:

Answered By - eyllanesc