[qt5] box layout

boxlayout.py

__author__ = 'tom'

import sys
from PyQt5.QtWidgets import (QWidget, QPushButton,
                             QHBoxLayout, QVBoxLayout, QApplication)


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        ok_btn = QPushButton('OK')
        cancel_btn = QPushButton('Cancel')

        h_box = QHBoxLayout()
        h_box.addStretch(1)  # add stretchable space on the left of the box
        h_box.addWidget(ok_btn)
        h_box.addWidget(cancel_btn)

        v_box = QVBoxLayout()
        v_box.addStretch(1)
        v_box.addLayout(h_box)

        self.setLayout(v_box)

        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')
        self.show()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())