How to Customize Appearance of PyQt5 Application

In this PyQt5 article, we want to learn How to Customize the Appearance of PyQt5 Application, so PyQt5 is a powerful Python GUI framework for building desktop applications. even though PyQt5 has a lot of widgets for building nice and powerful look and feel, but sometimes you may want to customize the appearance of your PyQt5 application. in this article, we want to talk about different techniques and options to help you create nice and wonderful user interfaces.

How to Change PyQt5 Window Title and Icon

The first step in customizing your GUI application in PyQt5 is to change the window title and icon. You can do this by using setWindowTitle() and setWindowIcon() methods of the QMainWindow class like this.

self.setWindowTitle("My Custom App")
self.setWindowIcon(QIcon("icon.png"))

1 2	self.setWindowTitle("My Custom App") self.setWindowIcon(QIcon("icon.png"))

How to Customize Fonts and Colors in PyQt5

PyQt5 provides several ways to modify fonts and colors throughout your application. you can use setFont() method to set a custom font for specific widgets or even the entire application. and also setStyleSheet() method allows you to define custom CSS like stylesheets to control the appearance of different widgets.

# Setting custom font for QLabel
label = QLabel("Hello, PyQt5!")
font = QFont("Arial", 12)
label.setFont(font)

# Applying custom stylesheet to widget
widget.setStyleSheet("background-color: blue; color: white;")

# Setting custom font for QLabel

label = QLabel("Hello, PyQt5!")

font = QFont("Arial", 12)

label.setFont(font)

# Applying custom stylesheet to widget

widget.setStyleSheet("background-color: blue; color: white;")

How to Create Custom Stylesheet in PyQt5

Stylesheets provide a powerful way to define the visual appearance of your PyQt5 application. you can use CSS like syntax to customize different aspects such as background colors, fonts, borders and many more. By applying stylesheets to individual widgets or entire layouts, you can achieve a unique design. this is an example.

# Creating custom stylesheet for QPushButton
button_style = """
QPushButton {
    background-color: red;
    color: white;
    font-size: 16px;
    padding: 10px;
}
QPushButton:hover {
    background-color: darkred;
}
"""

button = QPushButton("Click me")
button.setStyleSheet(button_style)

# Creating custom stylesheet for QPushButton

button_style = """

QPushButton {

background-color: red;

color: white;

font-size: 16px;

padding: 10px;

}

QPushButton:hover {

background-color: darkred;

}

"""

button = QPushButton("Click me")

button.setStyleSheet(button_style)

PyQt5 Customizing Icons

Icons play a vital role in the visual appeal of an application. PyQt5 provides support for different types of icons, including standard system icons, custom images and SVG icons. you can set icons for buttons, menus or even the application window using the setIcon() method. you can also use the QIcon class to load and manipulate icons dynamically.

# Setting an icon for QPushButton
button.setIcon(QIcon("path/to/icon.png"))

# Loading an SVG icon and setting it for QAction
action = QAction(QIcon("icon.svg"), "Action", self)

# Setting an icon for QPushButton

button.setIcon(QIcon("path/to/icon.png"))

# Loading an SVG icon and setting it for QAction

action = QAction(QIcon("icon.svg"), "Action", self)

PyQt5 Custom Graphics and Effects

PyQt5 allows you to leverage its powerful graphics framework to create custom visuals for your application. you can subclass QWidget or QFrame and override the paintEvent() method to draw custom shapes, images or apply different effects. this gives you complete control over the appearance of your application.

class CustomWidget(QWidget):
    def paintEvent(self, event):
        painter = QPainter(self)
        #Perform painting operations using QPainter methods

# Creat custom widget and adding it to the application layout
custom_widget = CustomWidget()
layout.addWidget(custom_widget)

class CustomWidget(QWidget):

def paintEvent(self, event):

painter = QPainter(self)

#Perform painting operations using QPainter methods

# Creat custom widget and adding it to the application layout

custom_widget = CustomWidget()

layout.addWidget(custom_widget)

This is the complete code for this article

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QPushButton, QVBoxLayout, QWidget
from PyQt5.QtGui import QIcon, QFont, QPainter
from PyQt5.QtCore import Qt

class CustomMainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("My Custom App")
        self.setWindowIcon(QIcon("icon.png"))

        central_widget = QWidget(self)
        self.setCentralWidget(central_widget)

        layout = QVBoxLayout(central_widget)

        label = QLabel("Hello Geekscoders.com")
        font = QFont("Arial", 12)
        label.setFont(font)
        layout.addWidget(label)

        button_style = """
        QPushButton {
            background-color: red;
            color: white;
            font-size: 16px;
            padding: 10px;
        }
        QPushButton:hover {
            background-color: darkred;
        }
        """

        button = QPushButton("Click me")
        button.setStyleSheet(button_style)
        layout.addWidget(button)

        custom_widget = CustomWidget()
        layout.addWidget(custom_widget)

class CustomWidget(QWidget):
    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setPen(Qt.red)
        painter.setBrush(Qt.yellow)
        painter.drawRect(50, 50, 200, 100)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = CustomMainWindow()
    window.show()
    sys.exit(app.exec_())

import sys

from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QPushButton, QVBoxLayout, QWidget

from PyQt5.QtGui import QIcon, QFont, QPainter

from PyQt5.QtCore import Qt

class CustomMainWindow(QMainWindow):

def __init__(self):

super().__init__()

self.setWindowTitle("My Custom App")

self.setWindowIcon(QIcon("icon.png"))

central_widget = QWidget(self)

self.setCentralWidget(central_widget)

layout = QVBoxLayout(central_widget)

label = QLabel("Hello Geekscoders.com")

font = QFont("Arial", 12)

label.setFont(font)

layout.addWidget(label)

button_style = """

QPushButton {

background-color: red;

color: white;

font-size: 16px;

padding: 10px;

}

QPushButton:hover {

background-color: darkred;

}

"""

button = QPushButton("Click me")

button.setStyleSheet(button_style)

layout.addWidget(button)

custom_widget = CustomWidget()

layout.addWidget(custom_widget)

class CustomWidget(QWidget):

def paintEvent(self, event):

painter = QPainter(self)

painter.setPen(Qt.red)

painter.setBrush(Qt.yellow)

painter.drawRect(50, 50, 200, 100)

if __name__ == "__main__":

app = QApplication(sys.argv)

window = CustomMainWindow()

window.show()

sys.exit(app.exec_())

Run your code and this will be the output