cefpython/src/linux/binaries_32bit/pyqt.py at cefpython53 · pythonthings/cefpython · GitHub

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# An example of embedding the CEF browser in a PyQt4 application.

# Tested with PyQt "4.9.1".

# Command for installing PyQt4: "sudo apt-get install python-qt4".

# The official CEF Python binaries come with tcmalloc hook

# disabled. But if you've built custom binaries and kept tcmalloc

# hook enabled, then be aware that in such case it is required

# for the cefpython module to be the very first import in

# python scripts. See Issue 73 in the CEF Python Issue Tracker

# for more details.

import ctypes, os, sys

libcef_so = os.path.join(os.path.dirname(os.path.abspath(__file__)),\

'libcef.so')

if os.path.exists(libcef_so):

# Import local module

ctypes.CDLL(libcef_so, ctypes.RTLD_GLOBAL)

if 0x02070000 <= sys.hexversion < 0x03000000:

import cefpython_py27 as cefpython

else:

raise Exception("Unsupported python version: %s" % sys.version)

else:

# Import from package

from cefpython3 import cefpython

from PyQt4 import QtGui

from PyQt4 import QtCore

def GetApplicationPath(file=None):

import re, os, platform

# On Windows after downloading file and calling Browser.GoForward(),

# current working directory is set to %UserProfile%.

# Calling os.path.dirname(os.path.realpath(__file__))

# returns for eg. "C:\Users\user\Downloads". A solution

# is to cache path on first call.

if not hasattr(GetApplicationPath, "dir"):

if hasattr(sys, "frozen"):

dir = os.path.dirname(sys.executable)

elif "__file__" in globals():

dir = os.path.dirname(os.path.realpath(__file__))

else:

dir = os.getcwd()

GetApplicationPath.dir = dir

# If file is None return current directory without trailing slash.

if file is None:

file = ""

# Only when relative path.

if not file.startswith("/") and not file.startswith("\\") and (

not re.search(r"^[\w-]+:", file)):

path = GetApplicationPath.dir + os.sep + file

if platform.system() == "Windows":

path = re.sub(r"[/\\]+", re.escape(os.sep), path)

path = re.sub(r"[/\\]+$", "", path)

return path

return str(file)

def ExceptHook(excType, excValue, traceObject):

import traceback, os, time, codecs

# This hook does the following: in case of exception write it to

# the "error.log" file, display it to the console, shutdown CEF

# and exit application immediately by ignoring "finally" (os._exit()).

errorMsg = "\n".join(traceback.format_exception(excType, excValue,

traceObject))

errorFile = GetApplicationPath("error.log")

try:

appEncoding = cefpython.g_applicationSettings["string_encoding"]

except:

appEncoding = "utf-8"

if type(errorMsg) == bytes:

errorMsg = errorMsg.decode(encoding=appEncoding, errors="replace")

try:

with codecs.open(errorFile, mode="a", encoding=appEncoding) as fp:

fp.write("\n[%s] %s\n" % (

time.strftime("%Y-%m-%d %H:%M:%S"), errorMsg))

except:

print("[pyqt.py] WARNING: failed writing to error file: %s" % (

errorFile))

# Convert error message to ascii before printing, otherwise

# you may get error like this:

# | UnicodeEncodeError: 'charmap' codec can't encode characters

errorMsg = errorMsg.encode("ascii", errors="replace")

errorMsg = errorMsg.decode("ascii", errors="replace")

print("\n"+errorMsg+"\n")

cefpython.QuitMessageLoop()

cefpython.Shutdown()

os._exit(1)

class MainWindow(QtGui.QMainWindow):

mainFrame = None

def __init__(self):

super(MainWindow, self).__init__(None)

self.createMenu()

self.mainFrame = MainFrame(self)

self.setCentralWidget(self.mainFrame)

self.resize(1024, 768)

self.setWindowTitle('PyQT CEF 3 example')

self.setFocusPolicy(QtCore.Qt.StrongFocus)

def createMenu(self):

menubar = self.menuBar()

filemenu = menubar.addMenu("&File")

filemenu.addAction(QtGui.QAction("Open", self))

filemenu.addAction(QtGui.QAction("Exit", self))

aboutmenu = menubar.addMenu("&About")

def focusInEvent(self, event):

# cefpython.WindowUtils.OnSetFocus(

# int(self.centralWidget().winId()), 0, 0, 0)

pass

def closeEvent(self, event):

self.mainFrame.browser.CloseBrowser()

class MainFrame(QtGui.QX11EmbedContainer):

browser = None

plug = None

def __init__(self, parent=None):

super(MainFrame, self).__init__(parent)

# QX11EmbedContainer provides an X11 window. The CEF

# browser can be embedded only by providing a GtkWidget

# pointer. So we're embedding a GtkPlug inside the X11

# window. In latest CEF trunk it is possible to embed

# the CEF browser by providing X11 window id. So it will

# be possible to remove the GTK dependency from CEF

# Python in the future.

gtkPlugPtr = cefpython.WindowUtils.gtk_plug_new(\

int(self.winId()))

print("[pyqt.py] MainFrame: GDK Native Window id: "+str(self.winId()))

print("[pyqt.py] MainFrame: GTK Plug ptr: "+str(gtkPlugPtr))

"""

Embedding GtkPlug is also possible with the pygtk module.

---------------------------------------------------------

self.plug = gtk.Plug(self.winId())

import re

m = re.search("GtkPlug at 0x(\w+)", str(self.plug))

hexId = m.group(1)

gtkPlugPtr = int(hexId, 16)

...

plug.show()

self.show()

---------------------------------------------------------

"""

windowInfo = cefpython.WindowInfo()

# Need to pass to CEF the GtkWidget* pointer

windowInfo.SetAsChild(gtkPlugPtr)

# Linux requires adding "file://" for local files,

# otherwise /home/some will be replaced as http://home/some

self.browser = cefpython.CreateBrowserSync(windowInfo,

browserSettings={},

navigateUrl="file://"+GetApplicationPath("example.html"))

cefpython.WindowUtils.gtk_widget_show(gtkPlugPtr)

self.show()

def moveEvent(self, event):

# cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)

pass

def resizeEvent(self, event):

# cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)

pass

class CefApplication(QtGui.QApplication):

timer = None

def __init__(self, args):

super(CefApplication, self).__init__(args)

self.createTimer()

def createTimer(self):

self.timer = QtCore.QTimer()

self.timer.timeout.connect(self.onTimer)

self.timer.start(10)

def onTimer(self):

# The proper way of doing message loop should be:

# 1. In createTimer() call self.timer.start(0)

# 2. In onTimer() call MessageLoopWork() only when

# QtGui.QApplication.instance()->hasPendingEvents()

# returns False.

# But there is a bug in Qt, hasPendingEvents() returns

# always true.

# (The behavior described above was tested on Windows

# with pyqt 4.8, maybe this is not true anymore,

# test it TODO)

cefpython.MessageLoopWork()

def stopTimer(self):

# Stop the timer after Qt message loop ended, calls to

# MessageLoopWork() should not happen anymore.

self.timer.stop()

if __name__ == '__main__':

print("[pyqt.py] PyQt version: %s" % QtCore.PYQT_VERSION_STR)

print("[pyqt.py] QtCore version: %s" % QtCore.qVersion())

# Intercept python exceptions. Exit app immediately when exception

# happens on any of the threads.

sys.excepthook = ExceptHook

# Application settings

settings = {

"debug": True, # cefpython debug messages in console and in log_file

"log_severity": cefpython.LOGSEVERITY_INFO, # LOGSEVERITY_VERBOSE

"log_file": GetApplicationPath("debug.log"), # Set to "" to disable.

# This directories must be set on Linux

"locales_dir_path": cefpython.GetModuleDirectory()+"/locales",

"resources_dir_path": cefpython.GetModuleDirectory(),

"browser_subprocess_path": "%s/%s" % (

cefpython.GetModuleDirectory(), "subprocess"),

}

# Command line switches set programmatically

switches = {

# "proxy-server": "socks5://127.0.0.1:8888",

# "enable-media-stream": "",

# "--invalid-switch": "" -> Invalid switch name

}

cefpython.Initialize(settings, switches)

app = CefApplication(sys.argv)

mainWindow = MainWindow()

mainWindow.show()

app.exec_()

app.stopTimer()

# Need to destroy QApplication(), otherwise Shutdown() fails.

# Unset main window also just to be safe.

del mainWindow

del app

cefpython.Shutdown()

cefpython/src/linux/binaries_32bit/pyqt.py at cefpython53 · pythonthings/cefpython · GitHub

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