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# Example of embedding CEF Python browser using Tkinter toolkit.
# This example has two widgets: a navigation bar and a browser.
# Tested with Tk 8.6 and CEF Python v53+.
# Issue #255: when typing url, mouse must be over url entry widget
# otherwise keyboard focus is lost.
from cefpython3 import cefpython as cef
try:
import tkinter as tk
except ImportError:
import Tkinter as tk
import sys
import os
import logging
# Globals
logger = logging.getLogger()
def main():
logger.setLevel(logging.INFO)
logger.addHandler(logging.StreamHandler())
logger.info("CEF Python {ver}".format(ver=cef.__version__))
logger.info("Python {ver}".format(ver=sys.version[:6]))
logger.info("Tk {ver}".format(ver=tk.TkVersion))
assert cef.__version__ >= "53.1", "CEF Python v53.1+ required to run this"
sys.excepthook = cef.ExceptHook # To shutdown all CEF processes on error
cef.Initialize()
app = MainFrame(tk.Tk())
app.mainloop()
cef.Shutdown()
class MainFrame(tk.Frame):
def __init__(self, master):
self.browser_frame = None
self.navigation_bar = None
# Root
master.geometry("800x600")
tk.Grid.rowconfigure(master, 0, weight=1)
tk.Grid.columnconfigure(master, 0, weight=1)
# MainFrame
tk.Frame.__init__(self, master)
self.master.title("Tkinter example")
self.master.protocol("WM_DELETE_WINDOW", self.on_close)
self.master.bind("<Configure>", self.on_root_configure)
self.setup_icon()
self.bind("<Configure>", self.on_configure)
self.bind("<FocusIn>", self.on_focus_in)
self.bind("<FocusOut>", self.on_focus_out)
# NavigationBar
self.navigation_bar = NavigationBar(self)
self.navigation_bar.grid(row=0, column=0,
sticky=(tk.N + tk.S + tk.E + tk.W))
tk.Grid.rowconfigure(self, 0, weight=0)
tk.Grid.columnconfigure(self, 0, weight=0)
# BrowserFrame
self.browser_frame = BrowserFrame(self, self.navigation_bar)
self.browser_frame.grid(row=1, column=0,
sticky=(tk.N + tk.S + tk.E + tk.W))
tk.Grid.rowconfigure(self, 1, weight=1)
tk.Grid.columnconfigure(self, 0, weight=1)
# Pack MainFrame
self.pack(fill=tk.BOTH, expand=tk.YES)
def on_root_configure(self, _):
logger.debug("MainFrame.on_root_configure")
if self.browser_frame:
self.browser_frame.on_root_configure()
def on_configure(self, event):
logger.debug("MainFrame.on_configure")
if self.browser_frame:
width = event.width
height = event.height
if self.navigation_bar:
height = height - self.navigation_bar.winfo_height()
self.browser_frame.on_mainframe_configure(width, height)
def on_focus_in(self, _):
logger.debug("MainFrame.on_focus_in")
def on_focus_out(self, _):
logger.debug("MainFrame.on_focus_out")
def on_close(self):
if self.browser_frame:
self.browser_frame.on_root_close()
self.master.destroy()
def get_browser(self):
if self.browser_frame:
return self.browser_frame.browser
return None
def get_browser_frame(self):
if self.browser_frame:
return self.browser_frame
return None
def setup_icon(self):
resources = os.path.join(os.path.dirname(__file__), "resources")
icon_path = os.path.join(resources, "tkinter.png")
if os.path.exists(icon_path):
self.icon = tk.PhotoImage(file=icon_path)
# noinspection PyProtectedMember
self.master.call("wm", "iconphoto", self.master._w, self.icon)
class NavigationBar(tk.Frame):
def __init__(self, master):
self.back_state = tk.NONE
self.forward_state = tk.NONE
self.back_image = None
self.forward_image = None
self.reload_image = None
tk.Frame.__init__(self, master)
resources = os.path.join(os.path.dirname(__file__), "resources")
# Back button
back_png = os.path.join(resources, "back.png")
if os.path.exists(back_png):
self.back_image = tk.PhotoImage(file=back_png)
self.back_button = tk.Button(self, image=self.back_image,
command=self.go_back)
self.back_button.grid(row=0, column=0)
# Forward button
forward_png = os.path.join(resources, "forward.png")
if os.path.exists(forward_png):
self.forward_image = tk.PhotoImage(file=forward_png)
self.forward_button = tk.Button(self, image=self.forward_image,
command=self.go_forward)
self.forward_button.grid(row=0, column=1)
# Reload button
reload_png = os.path.join(resources, "reload.png")
if os.path.exists(reload_png):
self.reload_image = tk.PhotoImage(file=reload_png)
self.reload_button = tk.Button(self, image=self.reload_image,
command=self.reload)
self.reload_button.grid(row=0, column=2)
# Url entry
self.url_entry = tk.Entry(self)
self.url_entry.bind("<FocusIn>", self.on_url_focus_in)
self.url_entry.bind("<FocusOut>", self.on_url_focus_out)
self.url_entry.bind("<Return>", self.on_load_url)
self.url_entry.bind("<Button-1>", self.on_button1)
self.url_entry.grid(row=0, column=3,
sticky=(tk.N + tk.S + tk.E + tk.W))
tk.Grid.rowconfigure(self, 0, weight=100)
tk.Grid.columnconfigure(self, 3, weight=100)
# Update state of buttons
self.update_state()
def go_back(self):
if self.master.get_browser():
self.master.get_browser().GoBack()
def go_forward(self):
if self.master.get_browser():
self.master.get_browser().GoForward()
def reload(self):
if self.master.get_browser():
self.master.get_browser().Reload()
def set_url(self, url):
self.url_entry.delete(0, tk.END)
self.url_entry.insert(0, url)
def on_url_focus_in(self, _):
logger.debug("NavigationBar.on_url_focus_in")
def on_url_focus_out(self, _):
logger.debug("NavigationBar.on_url_focus_out")
def on_load_url(self, _):
if self.master.get_browser():
self.master.get_browser().StopLoad()
self.master.get_browser().LoadUrl(self.url_entry.get())
def on_button1(self, _):
"""Fix CEF focus issues (#255). See also FocusHandler.OnGotFocus."""
logger.debug("NavigationBar.on_button1")
self.master.master.focus_force()
def update_state(self):
browser = self.master.get_browser()
if not browser:
if self.back_state != tk.DISABLED:
self.back_button.config(state=tk.DISABLED)
self.back_state = tk.DISABLED
if self.forward_state != tk.DISABLED:
self.forward_button.config(state=tk.DISABLED)
self.forward_state = tk.DISABLED
self.after(100, self.update_state)
return
if browser.CanGoBack():
if self.back_state != tk.NORMAL:
self.back_button.config(state=tk.NORMAL)
self.back_state = tk.NORMAL
else:
if self.back_state != tk.DISABLED:
self.back_button.config(state=tk.DISABLED)
self.back_state = tk.DISABLED
if browser.CanGoForward():
if self.forward_state != tk.NORMAL:
self.forward_button.config(state=tk.NORMAL)
self.forward_state = tk.NORMAL
else:
if self.forward_state != tk.DISABLED:
self.forward_button.config(state=tk.DISABLED)
self.forward_state = tk.DISABLED
self.after(100, self.update_state)
class Tabs(tk.Frame):
def __init__(self):
tk.Frame.__init__(self)
# TODO: implement tabs
class BrowserFrame(tk.Frame):
def __init__(self, master, navigation_bar=None):
self.navigation_bar = navigation_bar
self.closing = False
self.browser = None
tk.Frame.__init__(self, master)
self.bind("<FocusIn>", self.on_focus_in)
self.bind("<FocusOut>", self.on_focus_out)
self.bind("<Configure>", self.on_configure)
self.focus_set()
def embed_browser(self):
window_info = cef.WindowInfo()
window_info.SetAsChild(self.winfo_id())
self.browser = cef.CreateBrowserSync(window_info,
url="https://www.google.com/")
self.browser.SetClientHandler(LoadHandler(self))
# FocusHandler requires cefpython 53.2+
if cef.__version__ >= "53.2":
self.browser.SetClientHandler(FocusHandler(self))
self.message_loop_work()
def message_loop_work(self):
cef.MessageLoopWork()
self.after(10, self.message_loop_work)
def on_configure(self, _):
if not self.browser:
self.embed_browser()
def on_root_configure(self):
# Root <Configure> event will be called when top window is moved
if self.browser:
self.browser.NotifyMoveOrResizeStarted()
def on_mainframe_configure(self, width, height):
if self.browser:
self.browser.SetBounds(0, 0, width, height)
self.browser.NotifyMoveOrResizeStarted()
def on_focus_in(self, _):
logger.debug("BrowserFrame.on_focus_in")
if self.browser:
self.browser.SetFocus(True)
def on_focus_out(self, _):
logger.debug("BrowserFrame.on_focus_out")
if self.browser:
self.browser.SetFocus(False)
def on_root_close(self):
if self.browser:
# Close browser and free reference by setting to None
self.browser.CloseBrowser(True)
self.browser = None
self.destroy()
class LoadHandler(object):
def __init__(self, browser_frame):
self.browser_frame = browser_frame
def OnLoadStart(self, browser, _):
if self.browser_frame.master.navigation_bar:
self.browser_frame.master.navigation_bar.set_url(browser.GetUrl())
class FocusHandler(object):
"""FocusHandler is available in CEF Python 53.2 and higher."""
def __init__(self, browser_frame):
self.browser_frame = browser_frame
def OnTakeFocus(self, _, next_component):
logger.debug("FocusHandler.OnTakeFocus, next={next}"
.format(next=next_component))
def OnSetFocus(self, _, source):
logger.debug("FocusHandler.OnSetFocus, source={source}"
.format(source=source))
return False
def OnGotFocus(self, _):
"""Fix CEF focus issues (#255). Call browser frame's focus_set
to get rid of type cursor in url entry widget."""
logger.debug("FocusHandler.OnGotFocus")
self.browser_frame.focus_set()
if __name__ == '__main__':
main()
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