cefpython/examples/gtk2.py at cefpython57 · pythonthings/cefpython · GitHub

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# Example of embedding CEF browser using PyGTK library (GTK 2).

# Tested configurations:

# - GTK 2.24 on Windows/Linux/Mac

# - CEF Python v55.3+

from cefpython3 import cefpython as cef

import pygtk

import gtk

import gobject

import os

import platform

import sys

# 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")

# In CEF you can run message loop in two ways (see API ref for more details):

# 1. By calling cef.MessageLoopWork() in a timer - each call performs

# a single iteration of CEF message loop processing.

# 2. By calling cef.MessageLoop() instead of an application-provided

# message loop to get the best balance between performance and CPU

# usage. This function will block until a quit message is received by

# the system. This seem to work only on Linux in GTK example.

# NOTE: On Mac message loop timer doesn't work, so using CEF message

# loop by default.

MESSAGE_LOOP_TIMER = 1

MESSAGE_LOOP_CEF = 2 # Pass --message-loop-cef flag to script on Linux

g_message_loop = None

def main():

check_versions()

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

configure_message_loop()

cef.Initialize()

gobject.threads_init()

Gtk2Example()

if g_message_loop == MESSAGE_LOOP_CEF:

cef.MessageLoop()

else:

gtk.main()

cef.Shutdown()

def check_versions():

print("[gtk2.py] CEF Python {ver}".format(ver=cef.__version__))

print("[gtk2.py] Python {ver} {arch}".format(

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

print("[gtk2.py] GTK {ver}".format(ver='.'.join(

map(str, list(gtk.gtk_version)))))

assert cef.__version__ >= "55.3", "CEF Python v55.3+ required to run this"

pygtk.require('2.0')

def configure_message_loop():

global g_message_loop

if MAC and "--message-loop-cef" not in sys.argv:

print("[gtk2.py] Force --message-loop-cef flag on Mac")

sys.argv.append("--message-loop-cef")

if "--message-loop-cef" in sys.argv:

print("[gtk2.py] Message loop mode: CEF (best performance)")

g_message_loop = MESSAGE_LOOP_CEF

sys.argv.remove("--message-loop-cef")

else:

print("[gtk2.py] Message loop mode: TIMER")

g_message_loop = MESSAGE_LOOP_TIMER

class Gtk2Example:

def __init__(self):

self.browser = None

self.menubar_height = 0

self.exiting = False

self.main_window = gtk.Window(gtk.WINDOW_TOPLEVEL)

self.main_window.connect('focus-in-event', self.on_focus_in)

self.main_window.connect('configure-event', self.on_configure)

self.main_window.connect('destroy', self.on_exit)

self.main_window.set_size_request(width=800, height=600)

self.main_window.set_title('GTK 2 example (PyGTK)')

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

if os.path.exists(icon):

self.main_window.set_icon_from_file(icon)

self.main_window.realize()

self.vbox = gtk.VBox(False, 0)

self.vbox.connect('size-allocate', self.on_vbox_size_allocate)

self.menubar = self.create_menu()

self.menubar.connect('size-allocate', self.on_menubar_size_allocate)

self.vbox.pack_start(self.menubar, False, False, 0)

self.main_window.add(self.vbox)

# On Linux must show window first before embedding browser

# (Issue #347).

self.vbox.show()

self.main_window.show()

self.embed_browser()

self.vbox.get_window().focus()

self.main_window.get_window().focus()

if g_message_loop == MESSAGE_LOOP_TIMER:

gobject.timeout_add(10, self.on_timer)

def embed_browser(self):

windowInfo = cef.WindowInfo()

size = self.main_window.get_size()

rect = [0, 0, size[0], size[1]]

windowInfo.SetAsChild(self.get_window_handle(), rect)

self.browser = cef.CreateBrowserSync(windowInfo, settings={},

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

self.browser.SetClientHandler(LoadHandler())

def get_window_handle(self):

if WINDOWS:

return self.main_window.window.handle

elif LINUX:

return self.main_window.window.xid

elif MAC:

return self.main_window.window.nsview

def create_menu(self):

item1 = gtk.MenuItem('MenuBar')

item1.show()

item1_0 = gtk.Menu()

item1_1 = gtk.MenuItem('Just a menu')

item1_0.append(item1_1)

item1_1.show()

item1.set_submenu(item1_0)

menubar = gtk.MenuBar()

menubar.append(item1)

menubar.show()

return menubar

def on_timer(self):

if self.exiting:

return False

cef.MessageLoopWork()

return True

def on_focus_in(self, *_):

if self.browser:

self.browser.SetFocus(True)

return True

return False

def on_configure(self, *_):

if self.browser:

self.browser.NotifyMoveOrResizeStarted()

return False

def on_vbox_size_allocate(self, _, data):

if self.browser:

x = data.x

y = data.y + self.menubar_height

width = data.width

height = data.height - self.menubar_height

if WINDOWS:

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

elif LINUX:

self.browser.SetBounds(x, y, width, height)

def on_menubar_size_allocate(self, _, data):

self.menubar_height = data.height

def on_exit(self, *_):

if self.exiting:

print("[gtk2.py] on_exit() called, but already exiting")

return

self.exiting = True

self.browser.CloseBrowser(True)

self.clear_browser_references()

if g_message_loop == MESSAGE_LOOP_CEF:

cef.QuitMessageLoop()

else:

gtk.main_quit()

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

class LoadHandler(object):

def __init__(self):

self.initial_app_loading = True

def OnLoadStart(self, browser, **_):

if self.initial_app_loading:

# Temporary fix for focus issue during initial loading

# on Linux (Issue #284).

if LINUX:

print("[gtk2.py] LoadHandler.OnLoadStart:"

" keyboard focus fix (Issue #284)")

browser.SetFocus(True)

self.initial_app_loading = False

if __name__ == '__main__':

main()

cefpython/examples/gtk2.py at cefpython57 · pythonthings/cefpython · GitHub

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