Webkit free-layout pane provider for Leo (http://leoeditor.com/)

gistfile1.py

from PyQt4 import QtGui, QtWebKit, QtCore, Qt
from PyQt4.QtCore import Qt as QtConst

class WebKitPaneProvider:
    ns_id = '_add_tmce_pane'
    def __init__(self, c):
        self.c = c
        # Careful: we may be unit testing.
        if hasattr(c, 'free_layout'):
            splitter = c.free_layout.get_top_splitter()
            if splitter:
                splitter.register_provider(self)
    def ns_provides(self):
        return[('WebKit browser', self.ns_id)]
    def ns_provide(self, id_):
        if id_ != self.ns_id:
            return

        w = QtGui.QWidget()
        w.setLayout(QtGui.QVBoxLayout())
        location = QtGui.QLineEdit("http://www.google.com/")
        w.layout().addWidget(location)
        web_browser = QtWebKit.QWebView()
        w.layout().addWidget(web_browser)

        QtWebKit.QWebSettings.globalSettings().setAttribute(
            QtWebKit.QWebSettings.DeveloperExtrasEnabled, True)
            
        location.returnPressed.connect(
            lambda: web_browser.setUrl(QtCore.QUrl(location.text())))
        
        location.returnPressed.emit()
        
        web_browser.urlChanged.connect(
            lambda url: location.setText(url.toString()))
        
        return w

    def ns_provider_id(self):
        return self.ns_id

WebKitPaneProvider(c)

if hasattr(c, 'free_layout'):
    splitter = c.free_layout.get_top_splitter()
    if splitter:
        splitter.open_window(action=WebKitPaneProvider.ns_id)