import sys
import ctypes

import objc
import Cocoa
from PySide2.QtWidgets import QApplication, QMainWindow,QVBoxLayout,QWidget
from PySide2.QtGui import QPalette, QColor


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

        view = objc.objc_object(c_void_p=ctypes.c_void_p(int(self.winId())))
        self._window = view.window()
        self._hide_title_bar()

    def _hide_title_bar(self):
        self._window.setStyleMask_(
            self._window.styleMask() |
            Cocoa.NSFullSizeContentViewWindowMask)
        self._window.setTitlebarAppearsTransparent_(True)
        self._window.setTitleVisibility_(Cocoa.NSWindowTitleHidden)


class ModernWindow(BorderlessWindow):
    def __init__(self, window):
        super().__init__()
        self.hLayout = QVBoxLayout(self)
        self.hLayout.addWidget(window)

def theme(app):
    darkPalette = QPalette()
    darkPalette.setColor(QPalette.Window, QColor(53, 53, 53))
    app.setPalette(darkPalette)

    app.setStyleSheet("""#windowFrame {
      border-radius: 5px 5px 5px 5px;
      background-color: palette(Window);
    }""")

class TestWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    theme(app)
    mw = ModernWindow(TestWindow())
    mw.show()

    sys.exit(app.exec_())