cefpython/examples/qt.py at cefpython55 · pythonthings/cefpython · GitHub

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# Example of embedding CEF Python browser using PyQt/PySide libraries.

# This example has two widgets: a navigation bar and a browser.

# Tested configurations:

# - PyQt 4.11.4 (4.8.7) on Windows

# - PySide 1.2.4 (4.8.7) on Windows

# - PyQt 4.10.4 (4.8.6) on Linux

# - PySide 1.2.1 (4.8.6) on Linux

# - CEF Python v55.4+

from cefpython3 import cefpython as cef

import ctypes

import os

import platform

import sys

# PyQt imports

if "pyqt" in sys.argv:

# noinspection PyUnresolvedReferences

from PyQt4.QtGui import *

# noinspection PyUnresolvedReferences

from PyQt4.QtCore import *

# PySide imports

elif "pyside" in sys.argv:

# noinspection PyUnresolvedReferences

import PySide

# noinspection PyUnresolvedReferences

from PySide import QtCore

# noinspection PyUnresolvedReferences

from PySide.QtGui import *

# noinspection PyUnresolvedReferences

from PySide.QtCore import *

else:

print("USAGE:")

print(" qt.py pyqt")

print(" qt.py pyside")

sys.exit(1)

# Fix for PyCharm hints warnings

WindowUtils = cef.WindowUtils()

# Platforms

WINDOWS = (platform.system() == "Windows")

LINUX = (platform.system() == "Linux")

MAC = (platform.system() == "Darwin")

# Configuration

WIDTH = 800

HEIGHT = 600

# OS differences

CefWidgetParent = QWidget

if LINUX:

# noinspection PyUnresolvedReferences

CefWidgetParent = QX11EmbedContainer

def main():

check_versions()

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

cef.Initialize()

app = CefApplication(sys.argv)

main_window = MainWindow()

main_window.show()

app.exec_()

app.stopTimer()

del main_window # Just to be safe, see below

del app # Must destroy before calling Shutdown

cef.Shutdown()

def check_versions():

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

print("[qt.py] Python {ver}".format(ver=sys.version[:6]))

# PyQt version

if "pyqt" in sys.argv:

# noinspection PyUnresolvedReferences

print("[qt.py] PyQt {v1} ({v2})".format(

v1=PYQT_VERSION_STR, v2=qVersion()))

# PySide version

elif "pyside" in sys.argv:

print("[qt.py] PySide {v1} ({v2})".format(

v1=PySide.__version__, v2=QtCore.__version__))

# CEF Python version requirement

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

class MainWindow(QMainWindow):

def __init__(self):

super(MainWindow, self).__init__(None)

self.cef_widget = None

self.navigation_bar = None

if "pyqt" in sys.argv:

self.setWindowTitle("PyQt example")

elif "pyside" in sys.argv:

self.setWindowTitle("PySide example")

self.setFocusPolicy(Qt.StrongFocus)

self.setupLayout()

def setupLayout(self):

self.resize(WIDTH, HEIGHT)

self.cef_widget = CefWidget(self)

self.navigation_bar = NavigationBar(self.cef_widget)

layout = QGridLayout()

layout.addWidget(self.navigation_bar, 0, 0)

layout.addWidget(self.cef_widget, 1, 0)

layout.setContentsMargins(0, 0, 0, 0)

layout.setSpacing(0)

layout.setRowStretch(0, 0)

layout.setRowStretch(1, 1)

frame = QFrame()

frame.setLayout(layout)

self.setCentralWidget(frame)

# Browser can be embedded only after layout was set up

self.cef_widget.embedBrowser()

def focusInEvent(self, event):

# This event seems to never get called on Linux, as CEF is

# stealing all focus due to Issue #284.

# print("[qt.py] focusInEvent")

if self.cef_widget.browser:

if WINDOWS:

WindowUtils.OnSetFocus(self.cef_widget.getHandle(),

0, 0, 0)

self.cef_widget.browser.SetFocus(True)

def focusOutEvent(self, event):

# This event seems to never get called on Linux, as CEF is

# stealing all focus due to Issue #284.

# print("[qt.py] focusOutEvent")

pass

def closeEvent(self, event):

# Close browser (force=True) and free CEF reference

if self.cef_widget.browser:

self.cef_widget.browser.CloseBrowser(True)

self.cef_widget.browser = None # free ref

class NavigationBar(QFrame):

def __init__(self, cef_widget):

super(NavigationBar, self).__init__()

self.cef_widget = cef_widget

# Init layout

layout = QGridLayout()

layout.setContentsMargins(0, 0, 0, 0)

layout.setSpacing(0)

# Back button

self.back = self.createButton("back")

# noinspection PyUnresolvedReferences

self.back.clicked.connect(self.onBack)

layout.addWidget(self.back, 0, 0)

# Forward button

self.forward = self.createButton("forward")

# noinspection PyUnresolvedReferences

self.forward.clicked.connect(self.onForward)

layout.addWidget(self.forward, 0, 1)

# Reload button

self.reload = self.createButton("reload")

# noinspection PyUnresolvedReferences

self.reload.clicked.connect(self.onReload)

layout.addWidget(self.reload, 0, 2)

# Url input

self.url = QLineEdit("")

# noinspection PyUnresolvedReferences

self.url.returnPressed.connect(self.onGoUrl)

layout.addWidget(self.url, 0, 3)

# Layout

self.setLayout(layout)

self.updateState()

def onBack(self):

if self.cef_widget.browser:

self.cef_widget.browser.GoBack()

def onForward(self):

if self.cef_widget.browser:

self.cef_widget.browser.GoForward()

def onReload(self):

if self.cef_widget.browser:

self.cef_widget.browser.Reload()

def onGoUrl(self):

if self.cef_widget.browser:

self.cef_widget.browser.LoadUrl(self.url.text())

def updateState(self):

browser = self.cef_widget.browser

if not browser:

self.back.setEnabled(False)

self.forward.setEnabled(False)

self.reload.setEnabled(False)

self.url.setEnabled(False)

return

self.back.setEnabled(browser.CanGoBack())

self.forward.setEnabled(browser.CanGoForward())

self.reload.setEnabled(True)

self.url.setEnabled(True)

self.url.setText(browser.GetUrl())

def createButton(self, name):

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

"resources")

pixmap = QPixmap(os.path.join(resources, "{0}.png".format(name)))

icon = QIcon(pixmap)

button = QPushButton()

button.setIcon(icon)

button.setIconSize(pixmap.rect().size())

return button

class CefWidget(CefWidgetParent):

def __init__(self, parent=None):

super(CefWidget, self).__init__(parent)

self.parent = parent

self.browser = None

self.show()

def embedBrowser(self):

self.width = 0

self.height = 0

window_info = cef.WindowInfo()

window_info.SetAsChild(self.getHandle())

self.browser = cef.CreateBrowserSync(window_info,

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

self.browser.SetClientHandler(LoadHandler(self.parent.navigation_bar))

self.browser.SetClientHandler(FocusHandler())

def getHandle(self):

# PySide bug: QWidget.winId() returns <PyCObject object at 0x02FD8788>

# There is no easy way to convert it to int.

try:

return int(self.winId())

except:

if sys.version_info[0] == 2:

# Python 2

ctypes.pythonapi.PyCObject_AsVoidPtr.restype = (

ctypes.c_void_p)

ctypes.pythonapi.PyCObject_AsVoidPtr.argtypes = (

[ctypes.py_object])

return ctypes.pythonapi.PyCObject_AsVoidPtr(self.winId())

else:

# Python 3

ctypes.pythonapi.PyCapsule_GetPointer.restype = (

ctypes.c_void_p)

ctypes.pythonapi.PyCapsule_GetPointer.argtypes = (

[ctypes.py_object])

return ctypes.pythonapi.PyCapsule_GetPointer(

self.winId(), None)

def moveEvent(self, _):

# pos = event.pos()

# self.x = pos.x()

# self.y = pos.y()

self.x = 0

self.y = 0

if self.browser:

if WINDOWS:

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

elif LINUX:

self.browser.SetBounds(self.x, self.y,

self.width, self.height)

self.browser.NotifyMoveOrResizeStarted()

def resizeEvent(self, event):

size = event.size()

self.width = size.width()

self.height = size.height()

if self.browser:

if WINDOWS:

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

elif LINUX:

self.browser.SetBounds(self.x, self.y,

self.width, self.height)

self.browser.NotifyMoveOrResizeStarted()

class CefApplication(QApplication):

def __init__(self, args):

super(CefApplication, self).__init__(args)

self.timer = self.createTimer()

self.setupIcon()

def createTimer(self):

timer = QTimer()

# noinspection PyUnresolvedReferences

timer.timeout.connect(self.onTimer)

timer.start(10)

return timer

def onTimer(self):

# For best performance, a proper way of doing message loop should

# probably 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() always returns true.

# TODO: The bug above was noticed in Qt 4.8 on Windows. Other versions

# and/or other OSes may not be affected, so check it.

cef.MessageLoopWork()

def stopTimer(self):

# Stop the timer after Qt's message loop has ended

self.timer.stop()

def setupIcon(self):

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

"resources", "{0}.png".format(sys.argv[1]))

if os.path.exists(icon_file):

self.setWindowIcon(QIcon(icon_file))

class LoadHandler(object):

def __init__(self, navigation_bar):

self.initial_app_loading = True

self.navigation_bar = navigation_bar

def OnLoadingStateChange(self, **_):

self.navigation_bar.updateState()

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

self.navigation_bar.url.setText(browser.GetUrl())

if self.initial_app_loading:

# Temporary fix no. 2 for focus issue during initial loading

# on Linux (Issue #284). If this is not applied then

# sometimes during initial loading, keyboard focus may

# break and it is not possible to type anything, even

# though a type cursor blinks in web view.

if LINUX:

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

" keyboard focus fix no. 2 (#284)")

browser.SetFocus(True)

self.initial_app_loading = False

class FocusHandler(object):

def __init__(self):

pass

def OnTakeFocus(self, **kwargs):

# print("[qt.py] FocusHandler.OnTakeFocus, next={next}"

# .format(next=kwargs["next_component"]]))

pass

def OnSetFocus(self, **kwargs):

# source_enum = {cef.FOCUS_SOURCE_NAVIGATION: "navigation",

# cef.FOCUS_SOURCE_SYSTEM: "system"}

# print("[qt.py] FocusHandler.OnSetFocus, source={source}"

# .format(source=source_enum[kwargs["source"]]))

# return False

pass

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

# Temporary fix no. 1 for focus issues on Linux (Issue #284).

# If this is not applied then when switching to another

# window (alt+tab) and then back to this example, keyboard

# focus becomes broken, you can't type anything, even

# though a type cursor blinks in web view.

if LINUX:

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

" keyboard focus fix no. 1 (#284)")

browser.SetFocus(True)

if __name__ == '__main__':

main()

cefpython/examples/qt.py at cefpython55 · pythonthings/cefpython · GitHub

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