pyqt5 layout

A window can contain widgets (buttons, text field, image and others). Widgets are frequently added to a layout. A horizontal layout can be used to (dynamically) add widgets in horizontal direction.

In this article we’ll show you how to add buttons in the horizontal direction using a horizontal layout.

Related course:

• Create GUI Apps with PyQt5

Horizontal layout example
We will show the whole code and then explain.

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QGroupBox, QDialog, QVBoxLayout
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QDialog):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 layout - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 100
        self.initUI()
    
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.createHorizontalLayout()
        
        windowLayout = QVBoxLayout()
        windowLayout.addWidget(self.horizontalGroupBox)
        self.setLayout(windowLayout)
        
        self.show()
    
    def createHorizontalLayout(self):
        self.horizontalGroupBox = QGroupBox("What is your favorite color?")
        layout = QHBoxLayout()
        
        buttonBlue = QPushButton('Blue', self)
        buttonBlue.clicked.connect(self.on_click)
        layout.addWidget(buttonBlue)
        
        buttonRed = QPushButton('Red', self)
        buttonRed.clicked.connect(self.on_click)
        layout.addWidget(buttonRed)
        
        buttonGreen = QPushButton('Green', self)
        buttonGreen.clicked.connect(self.on_click)
        layout.addWidget(buttonGreen)
        
        self.horizontalGroupBox.setLayout(layout)
    
    @pyqtSlot()
    def on_click(self):
        print('PyQt5 button click')
    
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

Explanation

We start by calling the method self.createHorizontalLayout() inside the initUI() method.
Inside the method we create a box with a title and a horizontal layout:

self.horizontalGroupBox = QGroupBox("What is your favorite color?")
layout = QHBoxLayout()

We create widgets (in this example QPushButtons) and add them to the layout one by one:

buttonBlue = QPushButton('Blue', self)
buttonBlue.clicked.connect(self.on_click)
layout.addWidget(buttonBlue)

We set the title-box to contain the horizontal layout:

self.horizontalGroupBox.setLayout(layout)

In the initUI method we add it to the window:

windowLayout = QVBoxLayout()
windowLayout.addWidget(self.horizontalGroupBox)
self.setLayout(windowLayout)

If you are new to programming Python PyQt, I highly recommend this book.

Download PyQT5 Examples

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