How to align a QPushButton inside window?

Question

I want to align a QPushButton to the bottom right corner, but without a fixed size, because if I use a fixed size and resize the window, it doen't look good anymore. Here's my code:

    self.copy_btn = QtWidgets.QPushButton(self)
    self.copy_btn.setText("Copy")
    self.copy_btn.move(370, 350)

As you can see, I'm currenctly using .move(). I tried it with .setAlignment(QtCore.Qt.AlignRight), because it worked for the label, but it doesn't work for QPushButton.

What I intuit, since your question is not clear, is that you want the button to always be in the topleft of the window. Is my intuition correct? — eyllanesc, Jun 04 '20 at 17:46
@eyllanesc Yes, you're right, but it's actually the bottom right corner. — , Jun 04 '20 at 17:55

eyllanesc · Accepted Answer · 2020-06-04T18:31:14.677

There are several solutions depending on the context:

Using a QXBoxLayout

from PyQt5 import QtCore, QtWidgets


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.copy_btn = QtWidgets.QPushButton()
        self.copy_btn.setText("Copy")

        lay = QtWidgets.QVBoxLayout(self)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.addStretch()
        lay.addWidget(self.copy_btn, alignment=QtCore.Qt.AlignRight)

        # or
        # lay = QtWidgets.QHBoxLayout(self)
        # lay.setContentsMargins(0, 0, 0, 0)
        # lay.addStretch()
        # lay.addWidget(self.copy_btn, alignment=QtCore.Qt.AlignBottom)

        self.resize(640, 480)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)

    w = Widget()
    w.show()

    sys.exit(app.exec_())

Using an eventFilter

from PyQt5 import QtCore, QtWidgets


class Resizer(QtCore.QObject):
    def __init__(self, widget):
        super().__init__(widget)

        self._widget = widget

        self.widget.installEventFilter(self)
        if not self.widget.isWindow():
            self.widget.window().installEventFilter(self)

    @property
    def widget(self):
        return self._widget

    def eventFilter(self, obj, event):
        if obj is self.widget and not self.widget.isWindow():
            if event.type() == QtCore.QEvent.ParentAboutToChange:
                self.widget.window().removeEventFilter(self)
            elif event.type() == QtCore.QEvent.ParentChange:
                self.widget.window().installEventFilter(self)

        if obj is self.widget.window() and event.type() == QtCore.QEvent.Resize:
            geom = self.widget.geometry()
            geom.moveBottomRight(QtCore.QPoint(event.size().width(), event.size().height()))
            self.widget.setGeometry(geom)
        return super().eventFilter(obj, event)


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.copy_btn = QtWidgets.QPushButton(self)
        self.copy_btn.setText("Copy")

        resizer = Resizer(self.copy_btn)
        self.resize(640, 480)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)

    w = Widget()
    w.show()

    sys.exit(app.exec_())

How to align a QPushButton inside window?

1 Answers1