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# An example of embedding CEF browser in the Kivy framework.
# The browser is embedded using off-screen rendering mode.
# Tested using Kivy 1.7.2 stable on Ubuntu 12.04 64-bit.
# In this example kivy-lang is used to declare the layout which
# contains two buttons (back, forward) and the browser view.
# 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
cur_dir = os.path.dirname(os.path.abspath(__file__))
libcef_so = os.path.join(cur_dir, 'libcef.so')
if os.path.exists(libcef_so):
# Import local module
LD_LIBRARY_PATH = os.environ.get('LD_LIBRARY_PATH', None)
if not LD_LIBRARY_PATH:
LD_LIBRARY_PATH = cur_dir
else:
LD_LIBRARY_PATH += os.path.sep + cur_dir
os.putenv('LD_LIBRARY_PATH', LD_LIBRARY_PATH)
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
import pygtk
pygtk.require('2.0')
import gtk
import io
import kivy
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.popup import Popup
from kivy.uix.label import Label
from kivy.uix.widget import Widget
from kivy.graphics import Color, Rectangle, GraphicException
from kivy.clock import Clock
from kivy.graphics.texture import Texture
from kivy.uix.boxlayout import BoxLayout
from kivy.base import EventLoop
# Global variables
g_switches = None
class BrowserLayout(BoxLayout):
def __init__(self, **kwargs):
super(BrowserLayout, self).__init__(**kwargs)
self.orientation = "vertical"
self.browser_widget = CefBrowser(id="browser")
layout = BoxLayout()
layout.size_hint_y = None
layout.height = 40
layout.add_widget(Button(text="Back",
on_press=self.browser_widget.go_back))
layout.add_widget(Button(text="Forward",
on_press=self.browser_widget.go_forward))
layout.add_widget(Button(text="Reload",
on_press=self.browser_widget.reload))
layout.add_widget(Button(text="Print",
on_press=self.browser_widget.print_page))
layout.add_widget(Button(text="DevTools",
on_press=self.browser_widget.devtools))
self.add_widget(layout)
self.add_widget(self.browser_widget)
class CefBrowser(Widget):
# Keyboard mode: "global" or "local".
# 1. Global mode forwards keys to CEF all the time.
# 2. Local mode forwards keys to CEF only when an editable
# control is focused (input type=text|password or textarea).
keyboard_mode = "global"
'''Represent a browser widget for kivy, which can be used like a normal widget.
'''
def __init__(self, start_url='https://www.google.com/', **kwargs):
super(CefBrowser, self).__init__(**kwargs)
for arg in sys.argv:
if arg.startswith("http://") or arg.startswith("https://"):
start_url = arg
self.start_url = start_url
#Workaround for flexible size:
#start browser when the height has changed (done by layout)
#This has to be done like this because I wasn't able to change
#the texture size
#until runtime without core-dump.
self.bind(size = self.size_changed)
self.browser = None
starting = True
def size_changed(self, *kwargs):
'''When the height of the cefbrowser widget got changed, create the browser
'''
if self.starting:
if self.height != 100:
self.start_cef()
self.starting = False
else:
self.texture = Texture.create(
size=self.size, colorfmt='rgba', bufferfmt='ubyte')
self.texture.flip_vertical()
with self.canvas:
Color(1, 1, 1)
# This will cause segmentation fault:
# | self.rect = Rectangle(size=self.size, texture=self.texture)
# Update only the size:
self.rect.size = self.size
self.browser.WasResized()
count = 0
def _message_loop_work(self, *kwargs):
'''Get called every frame.
'''
self.count += 1
# print(self.count)
cefpython.MessageLoopWork()
self.on_mouse_move_emulate()
# From Kivy docs:
# Clock.schedule_once(my_callback, 0) # call after the next frame
# Clock.schedule_once(my_callback, -1) # call before the next frame
# When scheduling "after the next frame" Kivy calls _message_loop_work
# in about 13ms intervals. We use a small trick to make this 6ms
# interval by scheduling it alternately before and after the next
# frame. This gives better User Experience when scrolling.
# See Issue #240 for more details on OSR performance.
if self.count % 2 == 0:
Clock.schedule_once(self._message_loop_work, 0)
else:
Clock.schedule_once(self._message_loop_work, -1)
def _update_rect(self, *kwargs):
'''Get called whenever the texture got updated.
=> we need to reset the texture for the rectangle
'''
self.rect.texture = self.texture
def start_cef(self):
'''Starts CEF.
'''
# create texture & add it to canvas
self.texture = Texture.create(
size=self.size, colorfmt='rgba', bufferfmt='ubyte')
self.texture.flip_vertical()
with self.canvas:
Color(1, 1, 1)
self.rect = Rectangle(size=self.size, texture=self.texture)
# Configure CEF
settings = {
"debug": True, # cefpython debug messages in console and in log_file
"log_severity": cefpython.LOGSEVERITY_INFO,
"log_file": "debug.log",
# 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"),
"windowless_rendering_enabled": True,
"context_menu": {
# Disable context menu, popup widgets not supported
"enabled": False,
},
}
switches = {
# Tweaking OSR performance by setting the same Chromium flags
# as in upstream cefclient (# Issue #240).
"disable-surfaces": "",
"disable-gpu": "",
"disable-gpu-compositing": "",
"enable-begin-frame-scheduling": "",
}
browserSettings = {
# Tweaking OSR performance (Issue #240)
"windowless_frame_rate": 60
}
# Initialize CEF
cefpython.WindowUtils.InstallX11ErrorHandlers()
global g_switches
g_switches = switches
cefpython.Initialize(settings, switches)
# Start idle - CEF message loop work.
Clock.schedule_once(self._message_loop_work, 0)
# CEF needs a valid window handle passed to SetAsOffscreen()
# for Printing to work. There is no API to get Kivy's window
# handle so creating a dummy hidden Window using GTK.
gtkwin = gtk.Window()
gtkwin.realize()
# WindowInfo offscreen flag
windowInfo = cefpython.WindowInfo()
windowInfo.SetAsOffscreen(gtkwin.window.xid)
# Create Broswer and naviagte to empty page <= OnPaint won't get
# called yet
# The render handler callbacks are not yet set, thus an
# error report will be thrown in the console (when release
# DCHECKS are enabled), however don't worry, it is harmless.
# This is happening because calling GetViewRect will return
# false. That's why it is initially navigating to "about:blank".
# Later, a real url will be loaded using the LoadUrl() method
# and the GetViewRect will be called again. This time the render
# handler callbacks will be available, it will work fine from
# this point.
# --
# Do not use "about:blank" as navigateUrl - this will cause
# the GoBack() and GoForward() methods to not work.
#
self.browser = cefpython.CreateBrowserSync(windowInfo, browserSettings,
navigateUrl=self.start_url)
# Set focus
self.browser.SendFocusEvent(True)
self._client_handler = ClientHandler(self)
self.browser.SetClientHandler(self._client_handler)
self.set_js_bindings()
# Call WasResized() => force cef to call GetViewRect() and OnPaint
# afterwards
self.browser.WasResized()
# The browserWidget instance is required in OnLoadingStateChange().
self.browser.SetUserData("browserWidget", self)
if self.keyboard_mode == "global":
self.request_keyboard()
# Clock.schedule_once(self.change_url, 5)
_client_handler = None
_js_bindings = None
def set_js_bindings(self):
if not self._js_bindings:
self._js_bindings = cefpython.JavascriptBindings(
bindToFrames=True, bindToPopups=True)
self._js_bindings.SetFunction("__kivy__request_keyboard",
self.request_keyboard)
self._js_bindings.SetFunction("__kivy__release_keyboard",
self.release_keyboard)
self.browser.SetJavascriptBindings(self._js_bindings)
def change_url(self, *kwargs):
# Doing a javascript redirect instead of Navigate()
# solves the js bindings error. The url here need to
# be preceded with "http://". Calling StopLoad()
# might be a good idea before making the js navigation.
self.browser.StopLoad()
self.browser.GetMainFrame().ExecuteJavascript(
"window.location='http://www.youtube.com/'")
# Do not use Navigate() or GetMainFrame()->LoadURL(),
# as it causes the js bindings to be removed. There is
# a bug in CEF, that happens after a call to Navigate().
# The OnBrowserDestroyed() callback is fired and causes
# the js bindings to be removed. See this topic for more
# details:
# http://www.magpcss.org/ceforum/viewtopic.php?f=6&t=11009
# OFF:
# | self.browser.Navigate("http://www.youtube.com/")
_keyboard = None
def request_keyboard(self):
print("request_keyboard()")
self._keyboard = EventLoop.window.request_keyboard(
self.release_keyboard, self)
self._keyboard.bind(on_key_down=self.on_key_down)
self._keyboard.bind(on_key_up=self.on_key_up)
self.is_shift1 = False
self.is_shift2 = False
self.is_ctrl1 = False
self.is_ctrl2 = False
self.is_alt1 = False
self.is_alt2 = False
# Not sure if it is still required to send the focus
# (some earlier bug), but it shouldn't hurt to call it.
self.browser.SendFocusEvent(True)
def release_keyboard(self):
# When using local keyboard mode, do all the request
# and releases of the keyboard through js bindings,
# otherwise some focus problems arise.
self.is_shift1 = False
self.is_shift2 = False
self.is_ctrl1 = False
self.is_ctrl2 = False
self.is_alt1 = False
self.is_alt2 = False
if not self._keyboard:
return
print("release_keyboard()")
self._keyboard.unbind(on_key_down=self.on_key_down)
self._keyboard.unbind(on_key_up=self.on_key_up)
self._keyboard.release()
# Kivy does not provide modifiers in on_key_up, but these
# must be sent to CEF as well.
is_shift1 = False
is_shift2 = False
is_ctrl1 = False
is_ctrl2 = False
is_alt1 = False
is_alt2 = False
def on_key_down(self, keyboard, key, text, modifiers):
# NOTE: Right alt modifier is not sent by Kivy through modifiers param.
print("---- on_key_down")
print("-- key="+str(key))
# print(text) - utf-8 char
print("-- modifiers="+str(modifiers))
if text:
print("-- ord(text)="+str(ord(text)))
# CEF key event type:
# KEYEVENT_RAWKEYDOWN = 0
# KEYEVENT_KEYDOWN = 1
# KEYEVENT_KEYUP = 2
# KEYEVENT_CHAR = 3
# Kivy code -1 is a special key eg. Change keyboard layout.
# Sending it to CEF would crash it.
if key[0] == -1:
return
# On escape release the keyboard, see the injected in OnLoadStart()
if key[0] == 27:
self.browser.GetFocusedFrame().ExecuteJavascript(
"__kivy__on_escape()")
return
# CEF modifiers
# When pressing ctrl also set modifiers for ctrl
if key[0] in (306, 305):
modifiers.append('ctrl')
cef_modifiers = cefpython.EVENTFLAG_NONE
if "shift" in modifiers:
cef_modifiers |= cefpython.EVENTFLAG_SHIFT_DOWN
if "ctrl" in modifiers:
cef_modifiers |= cefpython.EVENTFLAG_CONTROL_DOWN
if "alt" in modifiers:
cef_modifiers |= cefpython.EVENTFLAG_ALT_DOWN
if "capslock" in modifiers:
cef_modifiers |= cefpython.EVENTFLAG_CAPS_LOCK_ON
keycode = self.get_windows_key_code(key[0])
charcode = key[0]
if text:
charcode = ord(text)
# Send key event to cef: RAWKEYDOWN
keyEvent = {
"type": cefpython.KEYEVENT_RAWKEYDOWN,
"windows_key_code": keycode,
"character": charcode,
"unmodified_character": charcode,
"modifiers": cef_modifiers,
}
print("- SendKeyEvent: %s" % keyEvent)
self.browser.SendKeyEvent(keyEvent)
# Send key event to cef: CHAR
if text:
keyEvent = {
"type": cefpython.KEYEVENT_CHAR,
"windows_key_code": keycode,
"character": charcode,
"unmodified_character": charcode,
"modifiers": cef_modifiers
}
print("- SendKeyEvent: %s" % keyEvent)
self.browser.SendKeyEvent(keyEvent)
if key[0] == 304:
self.is_shift1 = True
elif key[0] == 303:
self.is_shift2 = True
elif key[0] == 306:
self.is_ctrl1 = True
elif key[0] == 305:
self.is_ctrl2 = True
elif key[0] == 308:
self.is_alt1 = True
elif key[0] == 313:
self.is_alt2 = True
def on_key_up(self, keyboard, key):
print("---- on_key_up")
print("-- key="+str(key))
# Kivy code -1 is a special key eg. Change keyboard layout.
# Sending it to CEF would crash it.
if key[0] == -1:
return
# CEF modifiers
cef_modifiers = cefpython.EVENTFLAG_NONE
if self.is_shift1 or self.is_shift2:
cef_modifiers |= cefpython.EVENTFLAG_SHIFT_DOWN
if self.is_ctrl1 or self.is_ctrl2:
cef_modifiers |= cefpython.EVENTFLAG_CONTROL_DOWN
if self.is_alt1:
cef_modifiers |= cefpython.EVENTFLAG_ALT_DOWN
keycode = self.get_windows_key_code(key[0])
charcode = key[0]
# Send key event to cef: KEYUP
keyEvent = {
"type": cefpython.KEYEVENT_KEYUP,
"windows_key_code": keycode,
"character": charcode,
"unmodified_character": charcode,
"modifiers": cef_modifiers
}
print("- SendKeyEvent: %s" % keyEvent)
self.browser.SendKeyEvent(keyEvent)
if key[0] == 304:
self.is_shift1 = False
elif key[0] == 303:
self.is_shift2 = False
elif key[0] == 306:
self.is_ctrl1 = False
elif key[0] == 305:
self.is_ctrl2 = False
elif key[0] == 308:
self.is_alt1 = False
elif key[0] == 313:
self.is_alt2 = False
def get_windows_key_code(self, kivycode):
cefcode = kivycode
# NOTES:
# - Map on all platforms to OnPreKeyEvent.event["windows_key_code"]
# - Mapping all keys was not necessary on Linux, for example
# 'comma' worked fine, while 'dot' did not, but mapping all keys
# to make sure it will work correctly on all platforms.
# - If some key mapping is missing launch wxpython.py and see
# OnPreKeyEvent info for key events and replacate it here.
# (key codes can also be found on MSDN Virtual-key codes page)
# Must map basic letters, otherwise eg. ctrl+a to select all
# text won't work. (97-122 kivy <> 65-90 cef)
if 97 <= kivycode <= 122:
cefcode = kivycode - 32
other_keys_map = {
# Escape
"27":27,
# F1-F12
"282":112, "283":113, "284":114, "285":115,
"286":116, "287":117, "288":118, "289":119,
"290":120, "291":121, "292":122, "293":123,
# Tab
"9":9,
# Left Shift, Right Shift
"304":16, "303":16,
# Left Ctrl, Right Ctrl
"306":17, "305": 17,
# Left Alt, Right Alt
# TODO: left alt is_system_key=True in CEF but only when RAWKEYDOWN
"308":18, "313":225,
# Backspace
"8":8,
# Enter
"13":13,
# PrScr, ScrLck, Pause
"316":42, "302":145, "19":19,
# Insert, Delete,
# Home, End,
# Pgup, Pgdn
"277":45, "127":46,
"278":36, "279":35,
"280":33, "281":34,
# Arrows (left, up, right, down)
"276":37, "273":38, "275":39, "274":40,
# tilde
"96":192,
# minus, plus
"45":189, "61":187,
# square brackets / curly brackets, backslash
"91":219, "93":221, "92":220,
# windows key
"311":91,
# colon / semicolon
"59": 186,
# single quote / double quote
"39":222,
# comma, dot, slash
"44":188, "46":190, "47":91,
# context menu key is 93, but disable as it crashes app after
# context menu is shown.
"319":0,
}
if str(kivycode) in other_keys_map:
cefcode = other_keys_map[str(kivycode)]
return cefcode
def go_forward(self, *kwargs):
'''Going to forward in browser history
'''
print "go forward"
self.browser.GoForward()
def go_back(self, *kwargs):
'''Going back in browser history
'''
print "go back"
self.browser.GoBack()
def reload(self, *kwargs):
self.browser.Reload()
def print_page(self, *kwargs):
self.browser.Print()
def devtools(self, *kwargs):
# ShowDevTools doesn't work with the 'enable-begin-frame-scheduling'
# switch. This might be fixed by implementing native popup widgets,
# see Issue #69. The solution for now is to remove that switch,
# but this will impact performance.
if "enable-begin-frame-scheduling" in g_switches:
text = ("To enable DevTools you need to remove the\n"
"'enable-begin-frame-scheduling' switch that\n"
"is passed to cefpython.Initialize(). See also\n"
"comment in CefBrowser.devtools().")
popup = Popup(title='DevTools INFO', content=Label(text=text),
size_hint=(None, None), size=(400, 400))
popup.open()
else:
self.browser.ShowDevTools()
is_mouse_down = False
is_drag = False
is_drag_leave = False # Mouse leaves web view
drag_data = None
current_drag_operation = cefpython.DRAG_OPERATION_NONE
def on_touch_down(self, touch, *kwargs):
# Mouse scrolling
if "button" in touch.profile:
if touch.button in ["scrollup", "scrolldown"]:
# Handled in on_touch_up()
return
if not self.collide_point(*touch.pos):
return
touch.grab(self)
y = self.height-touch.pos[1]
if touch.is_double_tap:
# is_double_tap seems not to work in Kivy 1.7.
# Context menu is currently disabled see
# settings["context_menu"] in cef_start().
self.browser.SendMouseClickEvent(
touch.x, y, cefpython.MOUSEBUTTON_RIGHT,
mouseUp=False, clickCount=1
)
self.browser.SendMouseClickEvent(
touch.x, y, cefpython.MOUSEBUTTON_RIGHT,
mouseUp=True, clickCount=1
)
else:
self.browser.SendMouseClickEvent(touch.x, y,
cefpython.MOUSEBUTTON_LEFT,
mouseUp=False, clickCount=1)
self.is_mouse_down = True
def on_touch_up(self, touch, *kwargs):
# Mouse scrolling
if "button" in touch.profile:
if touch.button in ["scrollup", "scrolldown"]:
x = touch.x
y = self.height-touch.pos[1]
deltaY = -40 if "scrollup" == touch.button else 40
self.browser.SendMouseWheelEvent(x, y, deltaX=0, deltaY=deltaY)
return
if touch.grab_current is not self:
return
y = self.height-touch.pos[1]
self.browser.SendMouseClickEvent(touch.x, y, cefpython.MOUSEBUTTON_LEFT,
mouseUp=True, clickCount=1)
self.is_mouse_down = False
if self.is_drag:
#print("on_touch_up=%s/%s" % (touch.x,y))
if self.is_drag_leave or not self.is_inside_web_view(touch.x, y):
# See comment in is_inside_web_view() - x/y at borders
# should be treated as outside of web view.
x = touch.x
if x == 0:
x = -1
if x == self.width-1:
x = self.width
if y == 0:
y = -1
if y == self.height-1:
y = self.height
print("~~ DragSourceEndedAt")
print("~~ current_drag_operation=%s"
% self.current_drag_operation)
self.browser.DragSourceEndedAt(x, y,
self.current_drag_operation)
self.drag_ended()
else:
print("~~ DragTargetDrop")
print("~~ DragSourceEndedAt")
print("~~ current_drag_operation=%s"
% self.current_drag_operation)
self.browser.DragTargetDrop(touch.x, y)
self.browser.DragSourceEndedAt(touch.x, y,
self.current_drag_operation)
self.drag_ended()
touch.ungrab(self)
last_mouse_pos = None
def on_mouse_move_emulate(self):
if not hasattr(self.get_root_window(), "mouse_pos"):
# Not all Kivy window providers have the "mouse_pos" attribute.
# WindowPygame does have (kivy/kivy#325).
return
mouse_pos = self.get_root_window().mouse_pos
if self.last_mouse_pos == mouse_pos:
return
self.last_mouse_pos = mouse_pos
# Fix mouse pos: realy = 0, kivy y = 600 / realy = 600, kivy y = 0
x = mouse_pos[0]
y = int(mouse_pos[1]-self.height)
if x >= 0 and y <= 0:
y = abs(y)
if not self.is_mouse_down and not self.is_drag:
# When mouse is down on_touch_move will be called. Calling
# mouse move event here caused issues with drag&drop.
self.browser.SendMouseMoveEvent(x, y, mouseLeave=False)
def on_touch_move(self, touch, *kwargs):
if touch.grab_current is not self:
return
y = self.height-touch.pos[1]
modifiers = cefpython.EVENTFLAG_LEFT_MOUSE_BUTTON
self.browser.SendMouseMoveEvent(touch.x, y, mouseLeave=False,
modifiers=modifiers)
if self.is_drag:
#print("on_touch_move=%s/%s" % (touch.x, y))
if self.is_inside_web_view(touch.x, y):
if self.is_drag_leave:
print("~~ DragTargetDragEnter")
self.browser.DragTargetDragEnter(
self.drag_data, touch.x, y,
cefpython.DRAG_OPERATION_EVERY)
self.is_drag_leave = False
print("~~ DragTargetDragOver")
self.browser.DragTargetDragOver(
touch.x, y, cefpython.DRAG_OPERATION_EVERY)
self.update_drag_icon(touch.x, y)
else:
if not self.is_drag_leave:
self.is_drag_leave = True
print("~~ DragTargetDragLeave")
self.browser.DragTargetDragLeave()
def is_inside_web_view(self, x, y):
# When mouse is out of app window Kivy still generates move events
# at the borders with x=0, x=width-1, y=0, y=height-1.
if (x > 0 and x < self.width-1)\
and (y > 0 and y < self.height-1):
return True
return False
def drag_ended(self):
# Either success or cancelled.
self.is_drag = False
self.is_drag_leave = False
del self.drag_data
self.current_drag_operation = cefpython.DRAG_OPERATION_NONE
self.update_drag_icon(None, None)
print("~~ DragSourceSystemDragEnded")
self.browser.DragSourceSystemDragEnded()
drag_icon = None
def update_drag_icon(self, x, y):
if self.is_drag:
if self.drag_icon:
self.drag_icon.pos = self.flip_pos_vertical(x, y)
else:
image = self.drag_data.GetImage()
width = image.GetWidth()
height = image.GetHeight()
abuffer = image.GetAsBitmap(
1.0,
cefpython.CEF_COLOR_TYPE_BGRA_8888,
cefpython.CEF_ALPHA_TYPE_PREMULTIPLIED)
texture = Texture.create(size=(width, height))
texture.blit_buffer(abuffer, colorfmt='bgra', bufferfmt='ubyte')
texture.flip_vertical()
self.drag_icon = Rectangle(texture=texture,
pos=self.flip_pos_vertical(x, y),
size=(width, height))
self.canvas.add(self.drag_icon)
elif self.drag_icon:
self.canvas.remove(self.drag_icon)
del self.drag_icon
def flip_pos_vertical(self, x, y):
half = self.height / 2
if y > half:
y = half - (y-half)
elif y < half:
y = half + (half-y)
# Additionally position drag icon to the center of mouse cursor
y = y - 20
x = x - 20
return (x, y)
class ClientHandler:
def __init__(self, browserWidget):
self.browserWidget = browserWidget
def _fix_select_boxes(self, frame):
# This is just a temporary fix, until proper Popup widgets
# painting is implemented (PET_POPUP in OnPaint). Currently
# there is no way to obtain a native window handle (GtkWindow
# pointer) in Kivy, and this may cause things like context menus,
# select boxes and plugins not to display correctly. Although,
# this needs to be tested. The popup widget buffers are
# available in a separate paint buffer, so they could positioned
# freely so that it doesn't go out of the window. So the native
# window handle might not necessarily be required to make it work
# in most cases (99.9%). Though, this still needs testing to confirm.
# --
# See this topic on the CEF Forum regarding the NULL window handle:
# http://www.magpcss.org/ceforum/viewtopic.php?f=6&t=10851
# --
# See also a related topic on the Kivy-users group:
# https://groups.google.com/d/topic/kivy-users/WdEQyHI5vTs/discussion
# --
# The javascript select boxes library used:
# http://marcj.github.io/jquery-selectBox/
# --
# Cannot use "file://" urls to load local resources, error:
# | Not allowed to load local resource
print("_fix_select_boxes()")
resources_dir = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
"kivy-select-boxes")
if not os.path.exists(resources_dir):
print("The kivy-select-boxes directory does not exist, " \
"select boxes fix won't be applied.")
return
js_file = os.path.join(resources_dir, "kivy-selectBox.js")
js_content = ""
with open(js_file, "r") as myfile:
js_content = myfile.read()
css_file = os.path.join(resources_dir, "kivy-selectBox.css")
css_content = ""
with open(css_file, "r") as myfile:
css_content = myfile.read()
css_content = css_content.replace("\r", "")
css_content = css_content.replace("\n", "")
jsCode = """
%(js_content)s
var __kivy_temp_head = document.getElementsByTagName('head')[0];
var __kivy_temp_style = document.createElement('style');
__kivy_temp_style.type = 'text/css';
__kivy_temp_style.appendChild(document.createTextNode("%(css_content)s"));
__kivy_temp_head.appendChild(__kivy_temp_style);
""" % locals()
frame.ExecuteJavascript(jsCode,
"kivy_.py > ClientHandler > OnLoadStart > _fix_select_boxes()")
def OnLoadStart(self, browser, frame):
self._fix_select_boxes(frame);
browserWidget = browser.GetUserData("browserWidget")
if browserWidget and browserWidget.keyboard_mode == "local":
print("OnLoadStart(): injecting focus listeners for text controls")
# The logic is similar to the one found in kivy-berkelium:
# https://github.com/kivy/kivy-berkelium/blob/master/berkelium/__init__.py
jsCode = """
var __kivy__keyboard_requested = false;
function __kivy__keyboard_interval() {
var element = document.activeElement;
if (!element) {
return;
}
var tag = element.tagName;
var type = element.type;
if (tag == "INPUT" && (type == "" || type == "text"
|| type == "password") || tag == "TEXTAREA") {
if (!__kivy__keyboard_requested) {
__kivy__request_keyboard();
__kivy__keyboard_requested = true;
}
return;
}
if (__kivy__keyboard_requested) {
__kivy__release_keyboard();
__kivy__keyboard_requested = false;
}
}
function __kivy__on_escape() {
if (document.activeElement) {
document.activeElement.blur();
}
if (__kivy__keyboard_requested) {
__kivy__release_keyboard();
__kivy__keyboard_requested = false;
}
}
setInterval(__kivy__keyboard_interval, 100);
"""
frame.ExecuteJavascript(jsCode,
"kivy_.py > ClientHandler > OnLoadStart")
def OnLoadEnd(self, browser, frame, httpStatusCode):
# Browser lost its focus after the LoadURL() and the
# OnBrowserDestroyed() callback bug. When keyboard mode
# is local the fix is in the request_keyboard() method.
# Call it from OnLoadEnd only when keyboard mode is global.
browserWidget = browser.GetUserData("browserWidget")
if browserWidget and browserWidget.keyboard_mode == "global":
browser.SendFocusEvent(True)
def OnLoadingStateChange(self, browser, isLoading, canGoBack,
canGoForward):
print("OnLoadingStateChange(): isLoading = %s" % isLoading)
browserWidget = browser.GetUserData("browserWidget")
def OnPaint(self, browser, paintElementType, dirtyRects, buffer, width,
height):
# print "OnPaint()"
if paintElementType != cefpython.PET_VIEW:
print "Popups aren't implemented yet"
return
#update buffer
buffer = buffer.GetString(mode="bgra", origin="top-left")
#update texture of canvas rectangle
self.browserWidget.texture.blit_buffer(buffer, colorfmt='bgra',
bufferfmt='ubyte')
self.browserWidget._update_rect()
return True
def GetViewRect(self, browser, rect):
width, height = self.browserWidget.texture.size
rect.append(0)
rect.append(0)
rect.append(width)
rect.append(height)
# print("GetViewRect(): %s x %s" % (width, height))
return True
"""
def GetRootScreenRect(self, browser, rect):
width, height = self.browserWidget.texture.size
rect.append(0)
rect.append(0)
rect.append(width)
rect.append(height)
return True
def GetScreenRect(self, browser, rect):
width, height = self.browserWidget.texture.size
rect.append(0)
rect.append(0)
rect.append(width)
rect.append(height)
return True
def GetScreenPoint(self, browser, view_x, view_y, screen_coords):
screen_coords.append(view_x)
screen_coords.append(view_y)
return True
"""
def OnJavascriptDialog(self, browser, originUrl, dialogType,
messageText, defaultPromptText, callback,
suppressMessage):
suppressMessage[0] = True
return False
def OnBeforeUnloadJavascriptDialog(self, browser, messageText, isReload,
callback):
callback.Continue(allow=True, userInput="")
return True
def StartDragging(self, browser, drag_data, allowed_ops, x, y):
print("~~ StartDragging")
# Succession of d&d calls:
# DragTargetDragEnter
# DragTargetDragOver - in touch move event
# DragTargetDragLeave - optional
# DragSourceSystemDragEnded - optional, to cancel dragging
# DragTargetDrop - on mouse up
# DragSourceEndedAt - on mouse up
# DragSourceSystemDragEnded - on mouse up
print("~~ DragTargetDragEnter")
self.browserWidget.browser.DragTargetDragEnter(
drag_data, x, y, cefpython.DRAG_OPERATION_EVERY)
self.browserWidget.is_drag = True
self.browserWidget.is_drag_leave = False
self.browserWidget.drag_data = drag_data
self.browserWidget.current_drag_operation =\
cefpython.DRAG_OPERATION_NONE
self.browserWidget.update_drag_icon(x, y)
return True
def UpdateDragCursor(self, browser, operation):
#print("~~ UpdateDragCursor(): operation=%s" % operation)
self.browserWidget.current_drag_operation = operation
class CefBrowserApp(App):
def build(self):
self.layout = BrowserLayout()
return self.layout
def on_stop(self):
# This is required for a clean shutdown of CEF.
self.layout.browser_widget.browser.CloseBrowser(True)
del self.layout.browser_widget.browser
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