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252 lines (212 loc) · 8.66 KB
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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 v55.4+
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 = {}
if WINDOWS:
settings["auto_zooming"] = "system_dpi" # High DPI support
# noinspection PyUnresolvedReferences, PyArgumentList
cef.DpiAware.SetProcessDpiAware() # Alternative is to embed manifest
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__ >= "55.3", "CEF Python v55.3+ 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)
if MAC:
try:
# noinspection PyUnresolvedReferences
from AppKit import NSApp
# Make the content view for the window have a layer.
# This will make all sub-views have layers. This is
# necessary to ensure correct layer ordering of all
# child views and their layers. This fixes Window
# glitchiness during initial loading on Mac (Issue #371).
NSApp.windows()[0].contentView().setWantsLayer_(True)
except ImportError:
print("[wxpython.py] Warning: PyObjC package is missing, "
"cannot fix Issue #371")
print("[wxpython.py] To install PyObjC type: "
"pip install -U pyobjc")
if LINUX:
# On Linux must show before embedding browser, so that handle
# is available (Issue #347).
self.Show()
# In wxPython 3.0 and wxPython 4.0 on Linux handle is
# still not yet available, so must delay embedding browser
# (Issue #349).
if wx.version().startswith("3.") or wx.version().startswith("4."):
wx.CallLater(100, self.embed_browser)
else:
# This works fine in wxPython 2.8 on Linux
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()
assert self.browser_panel.GetHandle(), "Window handle not available yet"
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.OnSize(self.browser_panel.GetHandle(),
0, 0, 0)
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()