Coverage for qutebrowser/browser/webkit/webkittab.py : 1%

# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et: 

# Copyright 2016-2018 Florian Bruhin (The Compiler) <mail@qutebrowser.org> 

# 

# This file is part of qutebrowser. 

# 

# qutebrowser is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# qutebrowser is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the GNU General Public License 

# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>. 

"""Wrapper over our (QtWebKit) WebView.""" 

import re 

import functools 

import xml.etree.ElementTree 

import pygments 

import pygments.lexers 

import pygments.formatters 

import sip 

from PyQt5.QtCore import (pyqtSlot, Qt, QEvent, QUrl, QPoint, QTimer, QSizeF, 

QSize) 

from PyQt5.QtGui import QKeyEvent 

from PyQt5.QtWebKitWidgets import QWebPage, QWebFrame 

from PyQt5.QtWebKit import QWebSettings 

from PyQt5.QtPrintSupport import QPrinter 

from qutebrowser.browser import browsertab 

from qutebrowser.browser.webkit import webview, tabhistory, webkitelem 

from qutebrowser.utils import qtutils, objreg, usertypes, utils, log, debug 

class WebKitAction(browsertab.AbstractAction): 

"""QtWebKit implementations related to web actions.""" 

action_class = QWebPage 

action_base = QWebPage.WebAction 

def exit_fullscreen(self): 

raise browsertab.UnsupportedOperationError 

def save_page(self): 

"""Save the current page.""" 

raise browsertab.UnsupportedOperationError 

def show_source(self): 

def show_source_cb(source): 

"""Show source as soon as it's ready.""" 

# WORKAROUND for https://github.com/PyCQA/pylint/issues/491 

# pylint: disable=no-member 

lexer = pygments.lexers.HtmlLexer() 

formatter = pygments.formatters.HtmlFormatter( 

full=True, linenos='table') 

# pylint: enable=no-member 

highlighted = pygments.highlight(source, lexer, formatter) 

tb = objreg.get('tabbed-browser', scope='window', 

window=self._tab.win_id) 

new_tab = tb.tabopen(background=False, related=True) 

# The original URL becomes the path of a view-source: URL 

# (without a host), but query/fragment should stay. 

url = QUrl('view-source:' + urlstr) 

new_tab.set_html(highlighted, url) 

urlstr = self._tab.url().toString(QUrl.RemoveUserInfo) 

self._tab.dump_async(show_source_cb) 

class WebKitPrinting(browsertab.AbstractPrinting): 

"""QtWebKit implementations related to printing.""" 

def check_pdf_support(self): 

pass 

def check_printer_support(self): 

pass 

def check_preview_support(self): 

pass 

def to_pdf(self, filename): 

printer = QPrinter() 

printer.setOutputFileName(filename) 

self.to_printer(printer) 

def to_printer(self, printer, callback=None): 

self._widget.print(printer) 

# Can't find out whether there was an error... 

if callback is not None: 

callback(True) 

class WebKitSearch(browsertab.AbstractSearch): 

"""QtWebKit implementations related to searching on the page.""" 

def __init__(self, parent=None): 

super().__init__(parent) 

self._flags = QWebPage.FindFlags(0) 

def _call_cb(self, callback, found, text, flags, caller): 

"""Call the given callback if it's non-None. 

Delays the call via a QTimer so the website is re-rendered in between. 

Args: 

callback: What to call 

found: If the text was found 

text: The text searched for 

flags: The flags searched with 

caller: Name of the caller. 

""" 

found_text = 'found' if found else "didn't find" 

# Removing FindWrapsAroundDocument to get the same logging as with 

# QtWebEngine 

debug_flags = debug.qflags_key( 

QWebPage, flags & ~QWebPage.FindWrapsAroundDocument, 

klass=QWebPage.FindFlag) 

if debug_flags != '0x0000': 

flag_text = 'with flags {}'.format(debug_flags) 

else: 

flag_text = '' 

log.webview.debug(' '.join([caller, found_text, text, flag_text]) 

.strip()) 

if callback is not None: 

QTimer.singleShot(0, functools.partial(callback, found)) 

def clear(self): 

self.search_displayed = False 

# We first clear the marked text, then the highlights 

self._widget.findText('') 

self._widget.findText('', QWebPage.HighlightAllOccurrences) 

def search(self, text, *, ignore_case='never', reverse=False, 

result_cb=None): 

self.search_displayed = True 

self.text = text 

self._flags = QWebPage.FindWrapsAroundDocument 

if self._is_case_sensitive(ignore_case): 

self._flags |= QWebPage.FindCaseSensitively 

if reverse: 

self._flags |= QWebPage.FindBackward 

# We actually search *twice* - once to highlight everything, then again 

# to get a mark so we can navigate. 

found = self._widget.findText(text, self._flags) 

self._widget.findText(text, 

self._flags | QWebPage.HighlightAllOccurrences) 

self._call_cb(result_cb, found, text, self._flags, 'search') 

def next_result(self, *, result_cb=None): 

self.search_displayed = True 

found = self._widget.findText(self.text, self._flags) 

self._call_cb(result_cb, found, self.text, self._flags, 'next_result') 

def prev_result(self, *, result_cb=None): 

self.search_displayed = True 

# The int() here makes sure we get a copy of the flags. 

flags = QWebPage.FindFlags(int(self._flags)) 

if flags & QWebPage.FindBackward: 

flags &= ~QWebPage.FindBackward 

else: 

flags |= QWebPage.FindBackward 

found = self._widget.findText(self.text, flags) 

self._call_cb(result_cb, found, self.text, flags, 'prev_result') 

class WebKitCaret(browsertab.AbstractCaret): 

"""QtWebKit implementations related to moving the cursor/selection.""" 

@pyqtSlot(usertypes.KeyMode) 

def _on_mode_entered(self, mode): 

if mode != usertypes.KeyMode.caret: 

return 

settings = self._widget.settings() 

settings.setAttribute(QWebSettings.CaretBrowsingEnabled, True) 

self.selection_enabled = self._widget.hasSelection() 

if self._widget.isVisible(): 

# Sometimes the caret isn't immediately visible, but unfocusing 

# and refocusing it fixes that. 

self._widget.clearFocus() 

self._widget.setFocus(Qt.OtherFocusReason) 

# Move the caret to the first element in the viewport if there 

# isn't any text which is already selected. 

# 

# Note: We can't use hasSelection() here, as that's always 

# true in caret mode. 

if not self.selection_enabled: 

self._widget.page().currentFrame().evaluateJavaScript( 

utils.read_file('javascript/position_caret.js')) 

@pyqtSlot(usertypes.KeyMode) 

def _on_mode_left(self, _mode): 

settings = self._widget.settings() 

if settings.testAttribute(QWebSettings.CaretBrowsingEnabled): 

if self.selection_enabled and self._widget.hasSelection(): 

# Remove selection if it exists 

self._widget.triggerPageAction(QWebPage.MoveToNextChar) 

settings.setAttribute(QWebSettings.CaretBrowsingEnabled, False) 

self.selection_enabled = False 

def move_to_next_line(self, count=1): 

if not self.selection_enabled: 

act = QWebPage.MoveToNextLine 

else: 

act = QWebPage.SelectNextLine 

for _ in range(count): 

self._widget.triggerPageAction(act) 

def move_to_prev_line(self, count=1): 

if not self.selection_enabled: 

act = QWebPage.MoveToPreviousLine 

else: 

act = QWebPage.SelectPreviousLine 

for _ in range(count): 

self._widget.triggerPageAction(act) 

def move_to_next_char(self, count=1): 

if not self.selection_enabled: 

act = QWebPage.MoveToNextChar 

else: 

act = QWebPage.SelectNextChar 

for _ in range(count): 

self._widget.triggerPageAction(act) 

def move_to_prev_char(self, count=1): 

if not self.selection_enabled: 

act = QWebPage.MoveToPreviousChar 

else: 

act = QWebPage.SelectPreviousChar 

for _ in range(count): 

self._widget.triggerPageAction(act) 

def move_to_end_of_word(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToNextWord] 

if utils.is_windows: # pragma: no cover 

act.append(QWebPage.MoveToPreviousChar) 

else: 

act = [QWebPage.SelectNextWord] 

if utils.is_windows: # pragma: no cover 

act.append(QWebPage.SelectPreviousChar) 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_next_word(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToNextWord] 

if not utils.is_windows: # pragma: no branch 

act.append(QWebPage.MoveToNextChar) 

else: 

act = [QWebPage.SelectNextWord] 

if not utils.is_windows: # pragma: no branch 

act.append(QWebPage.SelectNextChar) 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_prev_word(self, count=1): 

if not self.selection_enabled: 

act = QWebPage.MoveToPreviousWord 

else: 

act = QWebPage.SelectPreviousWord 

for _ in range(count): 

self._widget.triggerPageAction(act) 

def move_to_start_of_line(self): 

if not self.selection_enabled: 

act = QWebPage.MoveToStartOfLine 

else: 

act = QWebPage.SelectStartOfLine 

self._widget.triggerPageAction(act) 

def move_to_end_of_line(self): 

if not self.selection_enabled: 

act = QWebPage.MoveToEndOfLine 

else: 

act = QWebPage.SelectEndOfLine 

self._widget.triggerPageAction(act) 

def move_to_start_of_next_block(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToNextLine, 

QWebPage.MoveToStartOfBlock] 

else: 

act = [QWebPage.SelectNextLine, 

QWebPage.SelectStartOfBlock] 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_start_of_prev_block(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToPreviousLine, 

QWebPage.MoveToStartOfBlock] 

else: 

act = [QWebPage.SelectPreviousLine, 

QWebPage.SelectStartOfBlock] 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_end_of_next_block(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToNextLine, 

QWebPage.MoveToEndOfBlock] 

else: 

act = [QWebPage.SelectNextLine, 

QWebPage.SelectEndOfBlock] 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_end_of_prev_block(self, count=1): 

if not self.selection_enabled: 

act = [QWebPage.MoveToPreviousLine, QWebPage.MoveToEndOfBlock] 

else: 

act = [QWebPage.SelectPreviousLine, QWebPage.SelectEndOfBlock] 

for _ in range(count): 

for a in act: 

self._widget.triggerPageAction(a) 

def move_to_start_of_document(self): 

if not self.selection_enabled: 

act = QWebPage.MoveToStartOfDocument 

else: 

act = QWebPage.SelectStartOfDocument 

self._widget.triggerPageAction(act) 

def move_to_end_of_document(self): 

if not self.selection_enabled: 

act = QWebPage.MoveToEndOfDocument 

else: 

act = QWebPage.SelectEndOfDocument 

self._widget.triggerPageAction(act) 

def toggle_selection(self): 

self.selection_enabled = not self.selection_enabled 

mainwindow = objreg.get('main-window', scope='window', 

window=self._tab.win_id) 

mainwindow.status.set_mode_active(usertypes.KeyMode.caret, True) 

def drop_selection(self): 

self._widget.triggerPageAction(QWebPage.MoveToNextChar) 

def selection(self, callback): 

callback(self._widget.selectedText()) 

def follow_selected(self, *, tab=False): 

if QWebSettings.globalSettings().testAttribute( 

QWebSettings.JavascriptEnabled): 

if tab: 

self._tab.data.override_target = usertypes.ClickTarget.tab 

self._tab.run_js_async( 

'window.getSelection().anchorNode.parentNode.click()') 

else: 

selection = self._widget.selectedHtml() 

if not selection: 

return 

try: 

selected_element = xml.etree.ElementTree.fromstring( 

'<html>{}</html>'.format(selection)).find('a') 

except xml.etree.ElementTree.ParseError: 

raise browsertab.WebTabError('Could not parse selected ' 

'element!') 

if selected_element is not None: 

try: 

url = selected_element.attrib['href'] 

except KeyError: 

raise browsertab.WebTabError('Anchor element without ' 

'href!') 

url = self._tab.url().resolved(QUrl(url)) 

if tab: 

self._tab.new_tab_requested.emit(url) 

else: 

self._tab.openurl(url) 

class WebKitZoom(browsertab.AbstractZoom): 

"""QtWebKit implementations related to zooming.""" 

def _set_factor_internal(self, factor): 

self._widget.setZoomFactor(factor) 

class WebKitScroller(browsertab.AbstractScroller): 

"""QtWebKit implementations related to scrolling.""" 

# FIXME:qtwebengine When to use the main frame, when the current one? 

def pos_px(self): 

return self._widget.page().mainFrame().scrollPosition() 

def pos_perc(self): 

return self._widget.scroll_pos 

def to_point(self, point): 

self._widget.page().mainFrame().setScrollPosition(point) 

def delta(self, x=0, y=0): 

qtutils.check_overflow(x, 'int') 

qtutils.check_overflow(y, 'int') 

self._widget.page().mainFrame().scroll(x, y) 

def delta_page(self, x=0.0, y=0.0): 

if y.is_integer(): 

y = int(y) 

if y == 0: 

pass 

elif y < 0: 

self.page_up(count=-y) 

elif y > 0: 

self.page_down(count=y) 

y = 0 

if x == 0 and y == 0: 

return 

size = self._widget.page().mainFrame().geometry() 

self.delta(x * size.width(), y * size.height()) 

def to_perc(self, x=None, y=None): 

if x is None and y == 0: 

self.top() 

elif x is None and y == 100: 

self.bottom() 

else: 

for val, orientation in [(x, Qt.Horizontal), (y, Qt.Vertical)]: 

if val is not None: 

frame = self._widget.page().mainFrame() 

maximum = frame.scrollBarMaximum(orientation) 

if maximum == 0: 

continue 

pos = int(maximum * val / 100) 

pos = qtutils.check_overflow(pos, 'int', fatal=False) 

frame.setScrollBarValue(orientation, pos) 

def _key_press(self, key, count=1, getter_name=None, direction=None): 

frame = self._widget.page().mainFrame() 

getter = None if getter_name is None else getattr(frame, getter_name) 

# FIXME:qtwebengine needed? 

# self._widget.setFocus() 

for _ in range(min(count, 5000)): 

# Abort scrolling if the minimum/maximum was reached. 

if (getter is not None and 

frame.scrollBarValue(direction) == getter(direction)): 

return 

self._tab.key_press(key) 

def up(self, count=1): 

self._key_press(Qt.Key_Up, count, 'scrollBarMinimum', Qt.Vertical) 

def down(self, count=1): 

self._key_press(Qt.Key_Down, count, 'scrollBarMaximum', Qt.Vertical) 

def left(self, count=1): 

self._key_press(Qt.Key_Left, count, 'scrollBarMinimum', Qt.Horizontal) 

def right(self, count=1): 

self._key_press(Qt.Key_Right, count, 'scrollBarMaximum', Qt.Horizontal) 

def top(self): 

self._key_press(Qt.Key_Home) 

def bottom(self): 

self._key_press(Qt.Key_End) 

def page_up(self, count=1): 

self._key_press(Qt.Key_PageUp, count, 'scrollBarMinimum', Qt.Vertical) 

def page_down(self, count=1): 

self._key_press(Qt.Key_PageDown, count, 'scrollBarMaximum', 

Qt.Vertical) 

def at_top(self): 

return self.pos_px().y() == 0 

def at_bottom(self): 

frame = self._widget.page().currentFrame() 

return self.pos_px().y() >= frame.scrollBarMaximum(Qt.Vertical) 

class WebKitHistory(browsertab.AbstractHistory): 

"""QtWebKit implementations related to page history.""" 

def current_idx(self): 

return self._history.currentItemIndex() 

def can_go_back(self): 

return self._history.canGoBack() 

def can_go_forward(self): 

return self._history.canGoForward() 

def _item_at(self, i): 

return self._history.itemAt(i) 

def _go_to_item(self, item): 

return self._history.goToItem(item) 

def serialize(self): 

return qtutils.serialize(self._history) 

def deserialize(self, data): 

return qtutils.deserialize(data, self._history) 

def load_items(self, items): 

stream, _data, user_data = tabhistory.serialize(items) 

qtutils.deserialize_stream(stream, self._history) 

for i, data in enumerate(user_data): 

self._history.itemAt(i).setUserData(data) 

cur_data = self._history.currentItem().userData() 

if cur_data is not None: 

if 'zoom' in cur_data: 

self._tab.zoom.set_factor(cur_data['zoom']) 

if ('scroll-pos' in cur_data and 

self._tab.scroller.pos_px() == QPoint(0, 0)): 

QTimer.singleShot(0, functools.partial( 

self._tab.scroller.to_point, cur_data['scroll-pos'])) 

class WebKitElements(browsertab.AbstractElements): 

"""QtWebKit implemementations related to elements on the page.""" 

def find_css(self, selector, callback, *, only_visible=False): 

mainframe = self._widget.page().mainFrame() 

if mainframe is None: 

raise browsertab.WebTabError("No frame focused!") 

elems = [] 

frames = webkitelem.get_child_frames(mainframe) 

for f in frames: 

for elem in f.findAllElements(selector): 

elems.append(webkitelem.WebKitElement(elem, tab=self._tab)) 

if only_visible: 

# pylint: disable=protected-access 

elems = [e for e in elems if e._is_visible(mainframe)] 

# pylint: enable=protected-access 

callback(elems) 

def find_id(self, elem_id, callback): 

def find_id_cb(elems): 

"""Call the real callback with the found elements.""" 

if not elems: 

callback(None) 

else: 

callback(elems[0]) 

# Escape non-alphanumeric characters in the selector 

# https://www.w3.org/TR/CSS2/syndata.html#value-def-identifier 

elem_id = re.sub(r'[^a-zA-Z0-9_-]', r'\\\g<0>', elem_id) 

self.find_css('#' + elem_id, find_id_cb) 

def find_focused(self, callback): 

frame = self._widget.page().currentFrame() 

if frame is None: 

callback(None) 

return 

elem = frame.findFirstElement('*:focus') 

if elem.isNull(): 

callback(None) 

else: 

callback(webkitelem.WebKitElement(elem, tab=self._tab)) 

def find_at_pos(self, pos, callback): 

assert pos.x() >= 0 

assert pos.y() >= 0 

frame = self._widget.page().frameAt(pos) 

if frame is None: 

# This happens when we click inside the webview, but not actually 

# on the QWebPage - for example when clicking the scrollbar 

# sometimes. 

log.webview.debug("Hit test at {} but frame is None!".format(pos)) 

callback(None) 

return 

# You'd think we have to subtract frame.geometry().topLeft() from the 

# position, but it seems QWebFrame::hitTestContent wants a position 

# relative to the QWebView, not to the frame. This makes no sense to 

# me, but it works this way. 

hitresult = frame.hitTestContent(pos) 

if hitresult.isNull(): 

# For some reason, the whole hit result can be null sometimes (e.g. 

# on doodle menu links). 

log.webview.debug("Hit test result is null!") 

callback(None) 

return 

try: 

elem = webkitelem.WebKitElement(hitresult.element(), tab=self._tab) 

except webkitelem.IsNullError: 

# For some reason, the hit result element can be a null element 

# sometimes (e.g. when clicking the timetable fields on 

# http://www.sbb.ch/ ). 

log.webview.debug("Hit test result element is null!") 

callback(None) 

return 

callback(elem) 

class WebKitTab(browsertab.AbstractTab): 

"""A QtWebKit tab in the browser.""" 

def __init__(self, *, win_id, mode_manager, private, parent=None): 

super().__init__(win_id=win_id, mode_manager=mode_manager, 

private=private, parent=parent) 

widget = webview.WebView(win_id=win_id, tab_id=self.tab_id, 

private=private, tab=self) 

if private: 

self._make_private(widget) 

self.history = WebKitHistory(self) 

self.scroller = WebKitScroller(self, parent=self) 

self.caret = WebKitCaret(mode_manager=mode_manager, 

tab=self, parent=self) 

self.zoom = WebKitZoom(tab=self, parent=self) 

self.search = WebKitSearch(parent=self) 

self.printing = WebKitPrinting() 

self.elements = WebKitElements(tab=self) 

self.action = WebKitAction(tab=self) 

self._set_widget(widget) 

self._connect_signals() 

self.backend = usertypes.Backend.QtWebKit 

def _install_event_filter(self): 

self._widget.installEventFilter(self._mouse_event_filter) 

def _make_private(self, widget): 

settings = widget.settings() 

settings.setAttribute(QWebSettings.PrivateBrowsingEnabled, True) 

def openurl(self, url): 

self._openurl_prepare(url) 

self._widget.openurl(url) 

def url(self, requested=False): 

frame = self._widget.page().mainFrame() 

if requested: 

return frame.requestedUrl() 

else: 

return frame.url() 

def dump_async(self, callback, *, plain=False): 

frame = self._widget.page().mainFrame() 

if plain: 

callback(frame.toPlainText()) 

else: 

callback(frame.toHtml()) 

def run_js_async(self, code, callback=None, *, world=None): 

if world is not None and world != usertypes.JsWorld.jseval: 

log.webview.warning("Ignoring world ID {}".format(world)) 

document_element = self._widget.page().mainFrame().documentElement() 

result = document_element.evaluateJavaScript(code) 

if callback is not None: 

callback(result) 

def icon(self): 

return self._widget.icon() 

def shutdown(self): 

self._widget.shutdown() 

def reload(self, *, force=False): 

if force: 

action = QWebPage.ReloadAndBypassCache 

else: 

action = QWebPage.Reload 

self._widget.triggerPageAction(action) 

def stop(self): 

self._widget.stop() 

def title(self): 

return self._widget.title() 

def clear_ssl_errors(self): 

self.networkaccessmanager().clear_all_ssl_errors() 

def key_press(self, key, modifier=Qt.NoModifier): 

press_evt = QKeyEvent(QEvent.KeyPress, key, modifier, 0, 0, 0) 

release_evt = QKeyEvent(QEvent.KeyRelease, key, modifier, 

0, 0, 0) 

self.send_event(press_evt) 

self.send_event(release_evt) 

@pyqtSlot() 

def _on_history_trigger(self): 

url = self.url() 

requested_url = self.url(requested=True) 

self.add_history_item.emit(url, requested_url, self.title()) 

def set_html(self, html, base_url=QUrl()): 

self._widget.setHtml(html, base_url) 

def networkaccessmanager(self): 

return self._widget.page().networkAccessManager() 

def user_agent(self): 

page = self._widget.page() 

return page.userAgentForUrl(self.url()) 

@pyqtSlot() 

def _on_load_started(self): 

super()._on_load_started() 

self.networkaccessmanager().netrc_used = False 

@pyqtSlot() 

def _on_frame_load_finished(self): 

"""Make sure we emit an appropriate status when loading finished. 

While Qt has a bool "ok" attribute for loadFinished, it always is True 

when using error pages... See 

https://github.com/qutebrowser/qutebrowser/issues/84 

""" 

self._on_load_finished(not self._widget.page().error_occurred) 

@pyqtSlot() 

def _on_webkit_icon_changed(self): 

"""Emit iconChanged with a QIcon like QWebEngineView does.""" 

if sip.isdeleted(self._widget): 

log.webview.debug("Got _on_webkit_icon_changed for deleted view!") 

return 

self.icon_changed.emit(self._widget.icon()) 

@pyqtSlot(QWebFrame) 

def _on_frame_created(self, frame): 

"""Connect the contentsSizeChanged signal of each frame.""" 

# FIXME:qtwebengine those could theoretically regress: 

# https://github.com/qutebrowser/qutebrowser/issues/152 

# https://github.com/qutebrowser/qutebrowser/issues/263 

frame.contentsSizeChanged.connect(self._on_contents_size_changed) 

@pyqtSlot(QSize) 

def _on_contents_size_changed(self, size): 

self.contents_size_changed.emit(QSizeF(size)) 

def _connect_signals(self): 

view = self._widget 

page = view.page() 

frame = page.mainFrame() 

page.windowCloseRequested.connect(self.window_close_requested) 

page.linkHovered.connect(self.link_hovered) 

page.loadProgress.connect(self._on_load_progress) 

frame.loadStarted.connect(self._on_load_started) 

view.scroll_pos_changed.connect(self.scroller.perc_changed) 

view.titleChanged.connect(self.title_changed) 

view.urlChanged.connect(self._on_url_changed) 

view.shutting_down.connect(self.shutting_down) 

page.networkAccessManager().sslErrors.connect(self._on_ssl_errors) 

frame.loadFinished.connect(self._on_frame_load_finished) 

view.iconChanged.connect(self._on_webkit_icon_changed) 

page.frameCreated.connect(self._on_frame_created) 

frame.contentsSizeChanged.connect(self._on_contents_size_changed) 

frame.initialLayoutCompleted.connect(self._on_history_trigger) 

def event_target(self): 

return self._widget