PyQt: How to stick a widget to the bottom edge of dialog

Question

Running this code creates a simple dialog with a label, lineedit and two buttons. All the widgets beautifully respond to the dialog horizontal resizing. But the buttons at the bottom of the dialog do not stick to the lower edge of dialog window when it is being resized vertically. What would be a possible solution to make sure the buttons are always positioned at the bottom edge of dialog?

from PyQt4 import QtCore, QtGui
app = QtGui.QApplication(sys.argv)



class mainWindow(QtGui.QMainWindow):

    def __init__(self):
        super(mainWindow, self).__init__()

        mainQWidget = QtGui.QWidget()
        mainLayout=QtGui.QFormLayout()
        mainLayout.setFieldGrowthPolicy(QtGui.QFormLayout.AllNonFixedFieldsGrow)

        label = QtGui.QLabel('My Label')  
        lineEdit = QtGui.QLineEdit()
        mainLayout.addRow(label, lineEdit)

        ButtonBox = QtGui.QGroupBox()
        ButtonsLayout = QtGui.QHBoxLayout()

        Button_01 = QtGui.QPushButton("Close")
        Button_02 = QtGui.QPushButton("Execute")

        ButtonsLayout.addWidget(Button_01)
        ButtonsLayout.addWidget(Button_02)

        ButtonBox.setLayout(ButtonsLayout)
        mainLayout.addRow(ButtonBox)

        mainQWidget.setLayout(mainLayout)
        self.setCentralWidget(mainQWidget)


if __name__ == '__main__':
    window = mainWindow()
    window.show()
    window.raise_() 
    window.resize(480,320)
    app.exec_()

Just on a side note: If you want a dialog, inherit from `QDialog` not from `QMainWindow`. — Hyperboreus, Mar 06 '14 at 20:08
Unfortunately QDialog doesn't have a 'Minimize Dialog' button (on OSX) while QMainWindow does. What are the side effects of using QMainWindow over QDialog? Why would be a reason behind of your recommendation of using QDialog over the QMainWindow? — alphanumeric, Mar 06 '14 at 20:16
Well, QDialog has `accepted` and `rejected` slots. It may be modal (but I think a MainWindow, too, not sure though). — Hyperboreus, Mar 06 '14 at 20:24

score 2 · Accepted Answer · answered Mar 06 '14 at 21:01

I would suggest using a QVBoxLayout as your main layout, with a stretch between the QFormLayout and the button's QHBoxLayout.

As an example based on your current dialog:

import sys
from PyQt4 import QtGui


class MainWindow(QtGui.QMainWindow):

    def __init__(self):
        super(MainWindow, self).__init__()

        label = QtGui.QLabel('My Label')
        line_edit = QtGui.QLineEdit()

        form_layout = QtGui.QFormLayout()
        form_layout.addRow(label, line_edit)

        close_button = QtGui.QPushButton('Close')
        execute_button = QtGui.QPushButton('Execute')

        button_layout = QtGui.QHBoxLayout()
        button_layout.addWidget(close_button)
        button_layout.addWidget(execute_button)

        main_layout = QtGui.QVBoxLayout()
        main_layout.addLayout(form_layout)
        main_layout.addStretch()
        main_layout.addLayout(button_layout)

        central_widget = QtGui.QWidget()
        central_widget.setLayout(main_layout)
        self.setCentralWidget(central_widget)


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = MainWindow()
    window.resize(480, 320)
    window.show()
    sys.exit(app.exec_())

PyQt: How to stick a widget to the bottom edge of dialog

1 Answers1