PyQt QGridLayout

Summary: in this tutorial, you will learn how to use PyQt QGridLayout to arrange widgets in uniform rows and columns.

Introduction to the PyQt QGridLayout

The QGridLayout allows you to place widgets in uniform rows and columns of a grid. For example, the following picture shows a grid that consists of four columns and three rows:

PyQt QGridLayout

Rows and columns are zero-based indexing. It means that the first row has an index of zero, the second row has an index of one, and so on. Similarly, the first column has an index of zero, the second column has an index of one, etc.

The intersection between a row and a column is called a cell. A cell is a space where you can place a widget.

Rows and columns can span. For example, the following picture illustrates that the second column of the first row spans two columns and the second row of the second column spans two rows:

PyQt QGridLayout - row and column span

If a widget takes less space than the containing cell, you can align it within the cell using one of the following alignment options:

Alignment FlagMeaning
AlignAbsoluteIf the direction is left to right, the AlignLeft means align with the right edge. However, if you want AlignLeft to be always aligned with the left edge, you can combine the AlignLeft with the AlignAbsolute option.
AlignBaselineAlign the widget with the baseline.
AlignBottomAlign the widget with the bottom edge.
AlignCenterCenters the widget in both dimensions.
AlignHCenterCenters the widget horizontally in the available space.
AlignHorizontal_MaskAlignLeft | AlignRight | AlignHCenter | AlignJustify | AlignAbsolute
AlignJustifyJustifies the text in the available space.
AlignLeftAlign the widget with the left edge.
AlignRightAlign the widget with the right edge.
AlignTopAlign the widget with the top edge.
AlignVCenterCenters the widget vertically in the available space.
AlignVertical_MaskAlignTop | AlignBottom | AlignVCenter | AlignBaseline

Using a QGridLayout

To use the QGridLayout, you follow these steps:

First, create a QGridLayout object:

layout = QGridLayout()
Code language: Python (python)

Second, set the parent widget layout:

parent.setLayout(layout)
Code language: Python (python)

Third, place the child widgets on the grid layout:

layout.addWidget(widget, row, column, rowSpan, columnSpan, alignment)
Code language: Python (python)

In this syntax:

  • widget is a child widget that you want to place on the grid.
  • row is a row index that starts from 0.
  • column is a column index that starts from 0.
  • rowSpan is the number of rows that you want to span.
  • columnSpan is the number of columns that you want to span.
  • alignment specifies the alignment of the widget within the cell.

To get the alignment value, you import Qt from PyQt6.QtCore:

from PyQt6.QtCore import Qt
Code language: Python (python)

and use one of the values of the Qt.AlignmentFlag enum, for example:

Qt.AlignmentFlag.AlignRight
Code language: Python (python)

PyQt QGridLayout example

The following example shows how to create a login form using the QGridLayout:

import sys from PyQt6.QtWidgets import QApplication, QWidget, QPushButton, QLineEdit, QLabel, QGridLayout from PyQt6.QtCore import Qt class MainWindow(QWidget): def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.setWindowTitle('Login Form') # set the grid layout layout = QGridLayout() self.setLayout(layout) # username layout.addWidget(QLabel('Username:'), 0, 0) layout.addWidget(QLineEdit(), 0, 1) # password layout.addWidget(QLabel('Password:'), 1, 0) layout.addWidget(QLineEdit(echoMode=QLineEdit.EchoMode.Password), 1, 1) # buttons layout.addWidget(QPushButton('Log in'), 2, 0, alignment=Qt.AlignmentFlag.AlignRight) layout.addWidget(QPushButton('Close'), 2, 1, alignment=Qt.AlignmentFlag.AlignRight) # show the window self.show() if __name__ == '__main__': app = QApplication(sys.argv) window = MainWindow() sys.exit(app.exec())
Code language: Python (python)

Output:

PyQt QGridLayout Example

How it works.

First, create a QGridLayout object:

layout = QGridLayout() self.setLayout(layout)
Code language: Python (python)

Second, place a QLabel on the cell (0,0) and QLineEdit on the cell (0,1) for creating the username field:

layout.addWidget(QLabel('Username:'), 0, 0) layout.addWidget(QLineEdit(), 0, 1)
Code language: Python (python)

Third, place a QLabel on the cell (1,0) and QLineEdit on the cell (1,1) for creating the password field:

layout.addWidget(QLabel('Password:'), 1, 0) layout.addWidget(QLineEdit(echoMode=QLineEdit.EchoMode.Password), 1, 1)
Code language: Python (python)

Finally, place a login button on the cell (2,0) and align it to the left edge. Also, place the close button on the cell (2,1) and align it to the right edge.

# buttons layout.addWidget(QPushButton('Log in'), 2, 0, alignment=Qt.AlignmentFlag.AlignRight) layout.addWidget(QPushButton('Close'), 2, 1, alignment=Qt.AlignmentFlag.AlignRight)
Code language: Python (python)

Summary

  • Use PyQt QGridLayout to arrange widgets in rows and columns.
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