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PyQt5 QSpinBox – Getting tight bounding rectangle of the font

  • Last Updated : 28 May, 2020
Geek Week

In this article we will see how we can get the tight bounding rectangle of the spin box’s font i.e text. The bounding rectangle always covers at least the set of pixels the text would cover if drawn at (0, 0).

Note : Newline characters are processed as normal characters, not as line breaks.

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

Syntax : font_metrics.tightBoundingRect(text)

Argument : It takes string as argument

Return : It returns QRect object.

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(1, 999999)
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
        # setting strike out to the font
        font = self.spin.font()
        # 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()
        # text
        text = self.spin.text()
        # getting the tight bounding rectangle 
        value = f_metrics.tightBoundingRect(text)
        # setting text to the label
        label.setText("Tight Rectangle : " + str(value))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app

Output :

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