run.py 文件源码

def run_gui():
    """
    Run B3 graphical user interface.
    Will raise an exception if the GUI cannot be initialized.
    """
    from b3.gui import B3App
    from b3.gui.misc import SplashScreen
    from PyQt5.QtWidgets import QMessageBox
    from PyQt5.QtWidgets import QSpacerItem, QSizePolicy

    # initialize outside try/except so if PyQt5 is not avaiable or there is
    # no display adapter available, this will raise an exception and we can
    # fallback into console mode
    app = B3App.Instance(sys.argv)

    try:
        with SplashScreen(min_splash_time=2):
            mainwindow = app.init()
    except Exception, e:
        box = QMessageBox()
        box.setIcon(QMessageBox.Critical)
        box.setWindowTitle('CRITICAL')
        box.setText('CRITICAL: B3 FAILED TO START!')
        box.setInformativeText('ERROR: %s' % e)
        box.setDetailedText(traceback.format_exc())
        box.setStandardButtons(QMessageBox.Ok)

        # this will trick Qt and resize a bit the QMessageBox to the exception stack trace is printed nice
        box.layout().addItem(QSpacerItem(400, 0, QSizePolicy.Minimum, QSizePolicy.Expanding),
                             box.layout().rowCount(), 0, 1, box.layout().columnCount())
        box.exec_()
        sys.exit(127)
    else:
        mainwindow.make_visible()
        sys.exit(app.exec_())