window_size.py

"""
Set initial window size to 900/640px without use of
any third party GUI framework. On Linux/Mac you can set
window size by calling WindowInfo.SetAsChild. On Windows
you can accomplish this by calling Windows native functions
using the ctypes module.
"""

from cefpython3 import cefpython as cef
import ctypes
import platform


def main():
    cef.Initialize()
    window_info = cef.WindowInfo()
    parent_handle = 0
    # This call has effect only on Mac and Linux.
    # All rect coordinates are applied including X and Y parameters.
    window_info.SetAsChild(parent_handle, [0, 0, 900, 640])
    browser = cef.CreateBrowserSync(url="https://www.google.com/",
                                    window_info=window_info,
                                    window_title="Window size")
    if platform.system() == "Windows":
        window_handle = browser.GetOuterWindowHandle()
        insert_after_handle = 0
        # X and Y parameters are ignored by setting the SWP_NOMOVE flag
        SWP_NOMOVE = 0x0002
        # noinspection PyUnresolvedReferences
        ctypes.windll.user32.SetWindowPos(window_handle, insert_after_handle,
                                          0, 0, 900, 640, SWP_NOMOVE)
    cef.MessageLoop()
    del browser
    cef.Shutdown()


if __name__ == '__main__':
    main()