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# Example of embedding CEF Python browser using PyGObject/PyGI (GTK 3).

# Tested configurations:

# - GTK 3.18 on Windows (cefpython v53.1+)

# - GTK 3.10 on Linux (works with cefpython v53.1 and v57.0+)

# Mac crash: This example crashes on Mac with error message:

# > _createMenuRef called with existing principal MenuRef..

# Reported as Issue #310.

from cefpython3 import cefpython as cef

import ctypes

import gi

import os

import platform

import sys

gi.require_version("Gtk", "3.0")

# noinspection PyUnresolvedReferences

from gi.repository import Gtk, GObject, Gdk, GdkPixbuf # noqa

# Fix for PyCharm hints warnings when using static methods

WindowUtils = cef.WindowUtils()

# Platforms

WINDOWS = (platform.system() == "Windows")

LINUX = (platform.system() == "Linux")

MAC = (platform.system() == "Darwin")

# Linux imports

if LINUX:

# noinspection PyUnresolvedReferences

from gi.repository import GdkX11

def main():

print("[gkt3.py] CEF Python {ver}".format(ver=cef.__version__))

print("[gkt3.py] Python {ver} {arch}".format(

ver=platform.python_version(), arch=platform.architecture()[0]))

print("[gkt3.py] GTK {major}.{minor}".format(

major=Gtk.get_major_version(),

minor=Gtk.get_minor_version()))

assert cef.__version__ >= "53.1", "CEF Python v53.1+ required to run this"

if not MAC:

# On Mac exception hook doesn't work and is causing a strange error:

# > Python[57738:d07] _createMenuRef called with existing principal

# > MenuRef already associated with menu

sys.excepthook = cef.ExceptHook # To shutdown CEF processes on error

cef.Initialize()

app = Gtk3Example()

SystemExit(app.run(sys.argv))

class Gtk3Example(Gtk.Application):

def __init__(self):

super(Gtk3Example, self).__init__(application_id='cefpython.gtk3')

self.browser = None

self.window = None

self.win32_handle = None

def run(self, argv):

GObject.threads_init()

GObject.timeout_add(10, self.on_timer)

self.connect("startup", self.on_startup)

self.connect("activate", self.on_activate)

self.connect("shutdown", self.on_shutdown)

return super(Gtk3Example, self).run(argv)

def get_handle(self):

if WINDOWS:

Gdk.threads_enter()

ctypes.pythonapi.PyCapsule_GetPointer.restype = ctypes.c_void_p

ctypes.pythonapi.PyCapsule_GetPointer.argtypes = \

[ctypes.py_object]

gpointer = ctypes.pythonapi.PyCapsule_GetPointer(

self.window.get_property("window").__gpointer__, None)

libgdk = ctypes.CDLL("libgdk-3-0.dll")

self.win32_handle = libgdk.gdk_win32_window_get_handle(gpointer)

Gdk.threads_leave()

return self.win32_handle

elif LINUX:

return self.window.get_property("window").get_xid()

elif MAC:

# TODO: Must call libgdk.gdk_quartz_window_get_nsview(gpointer)

# similarly as on Windows.

print("[gtk3.py] WARNING: get_handle not implemented on Mac")

return 0

def on_timer(self):

cef.MessageLoopWork()

return True

def on_startup(self, *_):

self.window = Gtk.ApplicationWindow.new(self)

self.window.set_title("GTK 3 example (PyGObject)")

self.window.set_default_size(800, 600)

self.window.connect("configure-event", self.on_configure)

self.window.connect("size-allocate", self.on_size_allocate)

self.window.connect("focus-in-event", self.on_focus_in)

self.window.connect("delete-event", self.on_window_close)

self.add_window(self.window)

self.setup_icon()

def on_activate(self, *_):

self.window.realize()

self.embed_browser()

self.window.show_all()

# Must set size of the window again after it was shown,

# otherwise browser occupies only part of the window area.

self.window.resize(*self.window.get_default_size())

def embed_browser(self):

window_info = cef.WindowInfo()

# TODO: on Mac pass rect[x, y, width, height] to SetAsChild

window_info.SetAsChild(self.get_handle())

self.browser = cef.CreateBrowserSync(window_info,

url="https://www.google.com/")

def on_configure(self, *_):

if self.browser:

self.browser.NotifyMoveOrResizeStarted()

return False

def on_size_allocate(self, _, data):

if self.browser:

if WINDOWS:

WindowUtils.OnSize(self.win32_handle, 0, 0, 0)

elif LINUX:

self.browser.SetBounds(data.x, data.y,

data.width, data.height)

def on_focus_in(self, *_):

if self.browser:

self.browser.SetFocus(True)

return True

return False

def on_window_close(self, *_):

if self.browser:

self.browser.CloseBrowser(True)

self.clear_browser_references()

def clear_browser_references(self):

# Clear browser references that you keep anywhere in your

# code. All references must be cleared for CEF to shutdown cleanly.

self.browser = None

def on_shutdown(self, *_):

cef.Shutdown()

def setup_icon(self):

icon = os.path.join(os.path.dirname(__file__), "resources", "gtk.png")

if not os.path.exists(icon):

return

pixbuf = GdkPixbuf.Pixbuf.new_from_file(icon)

transparent = pixbuf.add_alpha(True, 0xff, 0xff, 0xff)

Gtk.Window.set_default_icon_list([transparent])

if __name__ == '__main__':

main()

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