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# Example of embedding CEF Python browser using wxPython library.

# This example has a top menu and a browser widget without navigation bar.

# Tested configurations:

# - wxPython 4.0 on Windows/Mac/Linux

# - wxPython 3.0 on Windows/Mac

# - wxPython 2.8 on Linux

# - CEF Python v49.0+

import wx

from cefpython3 import cefpython as cef

import platform

import sys

import os

# 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")

# Configuration

WIDTH = 800

HEIGHT = 600

# Globals

g_count_windows = 0

def main():

check_versions()

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

settings = {}

# To enable High DPI support embed a DPI awareness manifest in

# both the main process and the subprocess.exe executable. Calling

# cef.DpiAware.SetProcessDpiAware sets DPI awareness only for

# the main process and thus is not recommended. Also you have to

# set ApplicationSettings.auto_zooming to "system_dpi".

cef.Initialize(settings=settings)

app = CefApp(False)

app.MainLoop()

del app # Must destroy before calling Shutdown

if not MAC:

# On Mac shutdown is called in OnClose

cef.Shutdown()

def check_versions():

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

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

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

print("[wxpython.py] wxPython {ver}".format(ver=wx.version()))

# CEF Python version requirement

assert cef.__version__ >= "49.0", "CEF Python v49.0+ required to run this"

class MainFrame(wx.Frame):

def __init__(self):

wx.Frame.__init__(self, parent=None, id=wx.ID_ANY,

title='wxPython example', size=(WIDTH, HEIGHT))

self.browser = None

# Must ignore X11 errors like 'BadWindow' and others by

# installing X11 error handlers. This must be done after

# wx was intialized.

if LINUX:

WindowUtils.InstallX11ErrorHandlers()

global g_count_windows

g_count_windows += 1

self.setup_icon()

self.create_menu()

self.Bind(wx.EVT_CLOSE, self.OnClose)

# Set wx.WANTS_CHARS style for the keyboard to work.

# This style also needs to be set for all parent controls.

self.browser_panel = wx.Panel(self, style=wx.WANTS_CHARS)

self.browser_panel.Bind(wx.EVT_SET_FOCUS, self.OnSetFocus)

self.browser_panel.Bind(wx.EVT_SIZE, self.OnSize)

# On Linux must show before embedding browser, so that handle

# is available (Issue #347).

if LINUX:

self.Show()

# In wxPython 3.0 and wxPython 4.0 handle is still

# not yet available, must delay embedding browser

# (Issue #349).

if wx.version().startswith("3.") or wx.version().startswith("4."):

wx.CallLater(20, self.embed_browser)

else:

# This works fine in wxPython 2.8

self.embed_browser()

else:

self.embed_browser()

self.Show()

def setup_icon(self):

icon_file = os.path.join(os.path.abspath(os.path.dirname(__file__)),

"resources", "wxpython.png")

# wx.IconFromBitmap is not available on Linux in wxPython 3.0/4.0

if os.path.exists(icon_file) and hasattr(wx, "IconFromBitmap"):

icon = wx.IconFromBitmap(wx.Bitmap(icon_file, wx.BITMAP_TYPE_PNG))

self.SetIcon(icon)

def create_menu(self):

filemenu = wx.Menu()

filemenu.Append(1, "Some option")

filemenu.Append(2, "Another option")

menubar = wx.MenuBar()

menubar.Append(filemenu, "&File")

self.SetMenuBar(menubar)

def embed_browser(self):

window_info = cef.WindowInfo()

(width, height) = self.browser_panel.GetClientSize().Get()

window_info.SetAsChild(self.browser_panel.GetHandle(),

[0, 0, width, height])

self.browser = cef.CreateBrowserSync(window_info,

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

self.browser.SetClientHandler(FocusHandler())

def OnSetFocus(self, _):

if not self.browser:

return

if WINDOWS:

WindowUtils.OnSetFocus(self.browser_panel.GetHandle(),

0, 0, 0)

self.browser.SetFocus(True)

def OnSize(self, _):

if not self.browser:

return

if WINDOWS:

WindowUtils.UpdateBrowserSize(self.browser_panel.GetHandle(),

self.browser)

elif LINUX:

(x, y) = (0, 0)

(width, height) = self.browser_panel.GetSize().Get()

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

self.browser.NotifyMoveOrResizeStarted()

def OnClose(self, event):

print("[wxpython.py] OnClose called")

if not self.browser:

# May already be closing, may be called multiple times on Mac

return

if MAC:

# On Mac things work differently, other steps are required

self.browser.CloseBrowser()

self.clear_browser_references()

self.Destroy()

global g_count_windows

g_count_windows -= 1

if g_count_windows == 0:

cef.Shutdown()

wx.GetApp().ExitMainLoop()

# Call _exit otherwise app exits with code 255 (Issue #162).

# noinspection PyProtectedMember

os._exit(0)

else:

# Calling browser.CloseBrowser() and/or self.Destroy()

# in OnClose may cause app crash on some paltforms in

# some use cases, details in Issue #107.

self.browser.ParentWindowWillClose()

event.Skip()

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

class FocusHandler(object):

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

# Temporary fix for focus issues on Linux (Issue #284).

if LINUX:

print("[wxpython.py] FocusHandler.OnGotFocus:"

" keyboard focus fix (Issue #284)")

browser.SetFocus(True)

class CefApp(wx.App):

def __init__(self, redirect):

self.timer = None

self.timer_id = 1

self.is_initialized = False

super(CefApp, self).__init__(redirect=redirect)

def OnPreInit(self):

super(CefApp, self).OnPreInit()

# On Mac with wxPython 4.0 the OnInit() event never gets

# called. Doing wx window creation in OnPreInit() seems to

# resolve the problem (Issue #350).

if MAC and wx.version().startswith("4."):

print("[wxpython.py] OnPreInit: initialize here"

" (wxPython 4.0 fix)")

self.initialize()

def OnInit(self):

self.initialize()

return True

def initialize(self):

if self.is_initialized:

return

self.is_initialized = True

self.create_timer()

frame = MainFrame()

self.SetTopWindow(frame)

frame.Show()

def create_timer(self):

# See also "Making a render loop":

# http://wiki.wxwidgets.org/Making_a_render_loop

# Another way would be to use EVT_IDLE in MainFrame.

self.timer = wx.Timer(self, self.timer_id)

self.Bind(wx.EVT_TIMER, self.on_timer, self.timer)

self.timer.Start(10) # 10ms timer

def on_timer(self, _):

cef.MessageLoopWork()

def OnExit(self):

self.timer.Stop()

return 0

if __name__ == '__main__':

main()

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