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PyQt5 QSpinBox – Checking if the character is in font

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  • Last Updated : 26 May, 2020
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In this article we will see how we can check if the given character is in the font of the spin box, in order to do this we have to get the QFontMetrics object of spin box which can be done with the help of fontmetrics method.

In order to do this we use inFont method with the spin box’s QFontMetrics object.

Syntax : font_metrics.inFont(ch)

Argument : It takes string as argument

Return : It returns bool.

Below is the implementation

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
class Window(QMainWindow):
    def __init__(self):
        # setting title
        self.setWindowTitle("Python ")
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
        # calling method
        # showing all the widgets
        # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
        # setting range to the spin box
        self.spin.setRange(0, 999999)
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
        # creating a label
        label = QLabel(self)
        # making label multi line
        # setting geometry to the label
        label.setGeometry(100, 200, 300, 60)
        # getting font metrics
        f_metrics = self.spin.fontMetrics()
        # checking if the character is in the font
        check = f_metrics.inFont('I')
        # setting text to the label
        label.setText(" 'I' in font ?  : " + str(check))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app

Output :

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