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[pygtk] Embedding a Win32 window or ActiveX control in a pygtk application

Richie Hindle richie at entrian.com

Thu Jun 9 07:23:41 WST 2005

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[Guillaume]

> I don't remember all details but I did embed a Flash file into a GTK

> window some time ago:

> [...]

> axcontainer=gtk.DrawingArea()

Aha! Parenting the control to a DrawingArea was the step I was missing.

Thanks!

I've now got this working, and an example application (a poor man's webbrowser,

embedding IE in pygtk via AtlAxWin and ctypes) is below. There are a few things

I couldn't make work:

o My keyboard accelerator (Alt+A to focus the address box) doesn't work

when IE has the focus. Any ideas? How do pygtk accelerators work under the

surface?

o Clicking a Gtk control when the IE control has the focus doesn't focus

the Gtk control. I worked around this by putting an event handler on the

Gtk controls for "button-press-event", but it would need to be done for

every Gtk control - is there a better solution?

o IE's accelerator keys (eg. Tab and Alt+Left) don't work. In a pure Win32

app, I'd fix this by calling IOleInPlaceActiveObject::TranslateAccelerator()

in the message pump, but can I get access to the message pump in pygtk?

o Pressing Enter in the address box should have the same effect as pressing

the Go button - I've done this, but it's a hack. Is there a better way?

o I'm using 65293 as the code for the Enter key - does pygtk have a constant

for this?

This is my first pygtk program, so any criticism or suggestions will be

gratefully received!

-------------------------------- snip snip --------------------------------

"""A poor man's webbrowser, embedding IE in pygtk via AtlAxWin and ctypes."""

import win32con

from ctypes import *

from ctypes.wintypes import *

from ctypes.com import IUnknown

from ctypes.com.automation import IDispatch, VARIANT

from ie6_gen import IWebBrowser2 # Copy ie6_gen from ctypes\win32\com\samples

kernel32 = windll.kernel32

user32 = windll.user32

atl = windll.atl # If this fails, you need atl.dll

import pygtk

pygtk.require("2.0")

import gtk

class GUI:

def __init__(self):

# Create the main GTK window.

self.main = gtk.Window(gtk.WINDOW_TOPLEVEL)

self.main.set_title("Poor man's browser [TM]")

self.main.connect("destroy", gtk.main_quit)

self.main.set_size_request(750, 550)

self.main.realize()

# Create a VBox to house the address bar and the IE control.

self.mainVBox = gtk.VBox()

self.main.add(self.mainVBox)

self.mainVBox.show()

# Create the address bar.

self.addressEntry = gtk.Entry()

self.addressEntry.show()

self.addressEntry.connect("key-press-event", self.on_addressEntry_key)

self.addressLabel = gtk.Label()

self.addressLabel.set_text_with_mnemonic("_Address: ")

self.addressLabel.set_mnemonic_widget(self.addressEntry)

self.addressLabel.show()

self.goButton = gtk.Button(" Go ")

self.goButton.show()

self.goButton.connect("clicked", self.on_goButton_clicked)

self.addressHbox = gtk.HBox()

self.addressHbox.show()

self.addressHbox.add(self.addressLabel)

self.addressHbox.add(self.addressEntry)

self.addressHbox.add(self.goButton)

self.addressHbox.set_child_packing(self.addressLabel,

False, True, 2, gtk.PACK_START)

self.addressHbox.set_child_packing(self.goButton,

False, True, 0, gtk.PACK_END)

self.mainVBox.add(self.addressHbox)

self.mainVBox.set_child_packing(self.addressHbox,

False, True, 0, gtk.PACK_START)

# Create a DrawingArea to host IE and add it to the hbox.

self.container = gtk.DrawingArea()

self.mainVBox.add(self.container)

self.container.show()

# Make the container accept the focus and pass it to the control;

# this makes the Tab key pass focus to IE correctly.

self.container.set_property("can-focus", True)

self.container.connect("focus", self.on_container_focus)

# Resize the AtlAxWin window with its container.

self.container.connect("size-allocate", self.on_container_size)

# Create an instance of IE via AtlAxWin.

atl.AtlAxWinInit()

hInstance = kernel32.GetModuleHandleA(None)

parentHwnd = self.container.window.handle

self.atlAxWinHwnd = \

user32.CreateWindowExA(0, "AtlAxWin", "http://www.pygtk.org",

win32con.WS_VISIBLE | win32con.WS_CHILD |

win32con.WS_HSCROLL | win32con.WS_VSCROLL,

0, 0, 100, 100, parentHwnd, None, hInstance, 0)

# Get the IWebBrowser2 interface for the IE control.

pBrowserUnk = POINTER(IUnknown)()

atl.AtlAxGetControl(self.atlAxWinHwnd, byref(pBrowserUnk))

self.pBrowser = POINTER(IWebBrowser2)()

pBrowserUnk.QueryInterface(byref(IWebBrowser2._iid_),

byref(self.pBrowser))

# Create a Gtk window that refers to the native AtlAxWin window.

self.gtkAtlAxWin = gtk.gdk.window_foreign_new(long(self.atlAxWinHwnd))

# By default, clicking a GTK widget doesn't grab the focus away from

# a native Win32 control.

self.addressEntry.connect("button-press-event", self.on_widget_click)

def on_goButton_clicked(self, widget):

v = byref(VARIANT())

self.pBrowser.Navigate(self.addressEntry.get_text(), v, v, v, v)

def on_addressEntry_key(self, widget, event):

if event.keyval == 65293: # "Enter"; is there a constant for this?

self.on_goButton_clicked(None)

def on_widget_click(self, widget, data):

self.main.window.focus()

def on_container_size(self, widget, sizeAlloc):

self.gtkAtlAxWin.move_resize(0, 0, sizeAlloc.width, sizeAlloc.height)

def on_container_focus(self, widget, data):

# Pass the focus to IE. First get the HWND of the IE control; this

# is a bit of a hack but I couldn't make IWebBrowser2._get_HWND work.

rect = RECT()

user32.GetWindowRect(self.atlAxWinHwnd, byref(rect))

ieHwnd = user32.WindowFromPoint(POINT(rect.left, rect.top))

user32.SetFocus(ieHwnd)

# Show the main window and run the message loop.

gui = GUI()

gui.main.show()

gtk.main()

-------------------------------- snip snip --------------------------------

--

Richie Hindle

richie at entrian.com

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