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"""QUiLoader example, showing how to dynamically load a Qt Designer form
   from a UI file."""

from argparse import ArgumentParser, RawTextHelpFormatter
import sys

from PySide2.QtCore import Qt, QFile, QIODevice
from PySide2.QtWidgets import QApplication, QWidget
from PySide2.QtUiTools import QUiLoader


if __name__ == '__main__':
    arg_parser = ArgumentParser(description="QUiLoader example",
                                formatter_class=RawTextHelpFormatter)
    arg_parser.add_argument('file', type=str, help='UI file')
    args = arg_parser.parse_args()
    ui_file_name = args.file

    app = QApplication(sys.argv)
    ui_file = QFile(ui_file_name)
    if not ui_file.open(QIODevice.ReadOnly):
        print("Cannot open {}: {}".format(ui_file_name, ui_file.errorString()))
        sys.exit(-1)
    loader = QUiLoader()
    widget = loader.load(ui_file, None)
    ui_file.close()
    if not widget:
        print(loader.errorString())
        sys.exit(-1)
    widget.show()
    sys.exit(app.exec_())
