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webenginetab.py
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webenginetab.py
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# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
# Copyright 2016 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/>.
# FIXME:qtwebengine remove this once the stubs are gone
# pylint: disable=unused-variable
"""Wrapper over a QWebEngineView."""
import functools
from PyQt5.QtCore import pyqtSlot, Qt, QEvent, QPoint, QUrl, QTimer
from PyQt5.QtGui import QKeyEvent, QIcon
# pylint: disable=no-name-in-module,import-error,useless-suppression
from PyQt5.QtWidgets import QOpenGLWidget, QApplication
from PyQt5.QtWebEngineWidgets import (QWebEnginePage, QWebEngineScript,
QWebEngineProfile)
# pylint: enable=no-name-in-module,import-error,useless-suppression
from qutebrowser.browser import browsertab, mouse
from qutebrowser.browser.webengine import (webview, webengineelem, tabhistory,
interceptor)
from qutebrowser.utils import (usertypes, qtutils, log, javascript, utils,
objreg)
def init():
"""Initialize QtWebEngine-specific modules."""
log.init.debug("Initializing request interceptor...")
host_blocker = objreg.get('host-blocker')
req_interceptor = interceptor.RequestInterceptor(
host_blocker, parent=QApplication.instance())
req_interceptor.install(QWebEngineProfile.defaultProfile())
class WebEnginePrinting(browsertab.AbstractPrinting):
"""QtWebEngine implementations related to printing."""
def check_pdf_support(self):
if not hasattr(self._widget.page(), 'printToPdf'):
raise browsertab.WebTabError(
"Printing to PDF is unsupported with QtWebEngine on Qt < 5.7")
def check_printer_support(self):
raise browsertab.WebTabError(
"Printing is unsupported with QtWebEngine")
def to_pdf(self, filename):
self._widget.page().printToPdf(filename)
def to_printer(self, printer):
# Should never be called
assert False
class WebEngineSearch(browsertab.AbstractSearch):
"""QtWebEngine implementations related to searching on the page."""
def __init__(self, parent=None):
super().__init__(parent)
self._flags = QWebEnginePage.FindFlags(0)
def _find(self, text, flags, cb=None):
"""Call findText on the widget with optional callback."""
if cb is None:
self._widget.findText(text, flags)
else:
self._widget.findText(text, flags, cb)
def search(self, text, *, ignore_case=False, reverse=False,
result_cb=None):
flags = QWebEnginePage.FindFlags(0)
if ignore_case == 'smart':
if not text.islower():
flags |= QWebEnginePage.FindCaseSensitively
elif not ignore_case:
flags |= QWebEnginePage.FindCaseSensitively
if reverse:
flags |= QWebEnginePage.FindBackward
self.text = text
self._flags = flags
self._find(text, flags, result_cb)
def clear(self):
self._widget.findText('')
def prev_result(self, *, result_cb=None):
# The int() here makes sure we get a copy of the flags.
flags = QWebEnginePage.FindFlags(int(self._flags))
if flags & QWebEnginePage.FindBackward:
flags &= ~QWebEnginePage.FindBackward
else:
flags |= QWebEnginePage.FindBackward
self._find(self.text, flags, result_cb)
def next_result(self, *, result_cb=None):
self._find(self.text, self._flags, result_cb)
class WebEngineCaret(browsertab.AbstractCaret):
"""QtWebEngine implementations related to moving the cursor/selection."""
@pyqtSlot(usertypes.KeyMode)
def _on_mode_entered(self, mode):
log.stub()
@pyqtSlot(usertypes.KeyMode)
def _on_mode_left(self):
log.stub()
def move_to_next_line(self, count=1):
log.stub()
def move_to_prev_line(self, count=1):
log.stub()
def move_to_next_char(self, count=1):
log.stub()
def move_to_prev_char(self, count=1):
log.stub()
def move_to_end_of_word(self, count=1):
log.stub()
def move_to_next_word(self, count=1):
log.stub()
def move_to_prev_word(self, count=1):
log.stub()
def move_to_start_of_line(self):
log.stub()
def move_to_end_of_line(self):
log.stub()
def move_to_start_of_next_block(self, count=1):
log.stub()
def move_to_start_of_prev_block(self, count=1):
log.stub()
def move_to_end_of_next_block(self, count=1):
log.stub()
def move_to_end_of_prev_block(self, count=1):
log.stub()
def move_to_start_of_document(self):
log.stub()
def move_to_end_of_document(self):
log.stub()
def toggle_selection(self):
log.stub()
def drop_selection(self):
log.stub()
def has_selection(self):
return self._widget.hasSelection()
def selection(self, html=False):
if html:
raise browsertab.UnsupportedOperationError
return self._widget.selectedText()
def follow_selected(self, *, tab=False):
log.stub()
class WebEngineScroller(browsertab.AbstractScroller):
"""QtWebEngine implementations related to scrolling."""
# FIXME:qtwebengine
# using stuff here with a big count/argument causes memory leaks and hangs
def __init__(self, tab, parent=None):
super().__init__(tab, parent)
self._pos_perc = (0, 0)
self._pos_px = QPoint()
self._at_bottom = False
def _init_widget(self, widget):
super()._init_widget(widget)
page = widget.page()
try:
page.scrollPositionChanged.connect(self._update_pos)
except AttributeError:
log.stub('scrollPositionChanged, on Qt < 5.7')
self._pos_perc = (None, None)
def _key_press(self, key, count=1):
# FIXME:qtwebengine Abort scrolling if the minimum/maximum was reached.
press_evt = QKeyEvent(QEvent.KeyPress, key, Qt.NoModifier, 0, 0, 0)
release_evt = QKeyEvent(QEvent.KeyRelease, key, Qt.NoModifier, 0, 0, 0)
for _ in range(count):
self._tab.send_event(press_evt)
self._tab.send_event(release_evt)
@pyqtSlot()
def _update_pos(self):
"""Update the scroll position attributes when it changed."""
def update_pos_cb(jsret):
"""Callback after getting scroll position via JS."""
if jsret is None:
# This can happen when the callback would get called after
# shutting down a tab
return
assert isinstance(jsret, dict), jsret
self._pos_perc = (jsret['perc']['x'], jsret['perc']['y'])
self._pos_px = QPoint(jsret['px']['x'], jsret['px']['y'])
self._at_bottom = jsret['at_bottom']
self.perc_changed.emit(*self._pos_perc)
js_code = javascript.assemble('scroll', 'pos')
self._tab.run_js_async(js_code, update_pos_cb)
def pos_px(self):
return self._pos_px
def pos_perc(self):
return self._pos_perc
def to_perc(self, x=None, y=None):
js_code = javascript.assemble('scroll', 'to_perc', x, y)
self._tab.run_js_async(js_code)
def to_point(self, point):
js_code = javascript.assemble('window', 'scroll', point.x(), point.y())
self._tab.run_js_async(js_code)
def delta(self, x=0, y=0):
self._tab.run_js_async(javascript.assemble('window', 'scrollBy', x, y))
def delta_page(self, x=0, y=0):
js_code = javascript.assemble('scroll', 'delta_page', x, y)
self._tab.run_js_async(js_code)
def up(self, count=1):
self._key_press(Qt.Key_Up, count)
def down(self, count=1):
self._key_press(Qt.Key_Down, count)
def left(self, count=1):
self._key_press(Qt.Key_Left, count)
def right(self, count=1):
self._key_press(Qt.Key_Right, count)
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)
def page_down(self, count=1):
self._key_press(Qt.Key_PageDown, count)
def at_top(self):
return self.pos_px().y() == 0
def at_bottom(self):
return self._at_bottom
class WebEngineHistory(browsertab.AbstractHistory):
"""QtWebEngine implementations related to page history."""
def current_idx(self):
return self._history.currentItemIndex()
def back(self):
self._history.back()
def forward(self):
self._history.forward()
def can_go_back(self):
return self._history.canGoBack()
def can_go_forward(self):
return self._history.canGoForward()
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, cur_data = tabhistory.serialize(items)
qtutils.deserialize_stream(stream, self._history)
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 WebEngineZoom(browsertab.AbstractZoom):
"""QtWebEngine implementations related to zooming."""
def _set_factor_internal(self, factor):
self._widget.setZoomFactor(factor)
def factor(self):
return self._widget.zoomFactor()
class WebEngineElements(browsertab.AbstractElements):
"""QtWebEngine implemementations related to elements on the page."""
def _js_cb_multiple(self, callback, js_elems):
"""Handle found elements coming from JS and call the real callback.
Args:
callback: The callback to call with the found elements.
js_elems: The elements serialized from javascript.
"""
elems = []
for js_elem in js_elems:
elem = webengineelem.WebEngineElement(js_elem, tab=self._tab)
elems.append(elem)
callback(elems)
def _js_cb_single(self, callback, js_elem):
"""Handle a found focus elem coming from JS and call the real callback.
Args:
callback: The callback to call with the found element.
Called with a WebEngineElement or None.
js_elem: The element serialized from javascript.
"""
log.webview.debug("Got element from JS: {!r}".format(js_elem))
if js_elem is None:
callback(None)
else:
elem = webengineelem.WebEngineElement(js_elem, tab=self._tab)
callback(elem)
def find_css(self, selector, callback, *, only_visible=False):
js_code = javascript.assemble('webelem', 'find_all', selector,
only_visible)
js_cb = functools.partial(self._js_cb_multiple, callback)
self._tab.run_js_async(js_code, js_cb)
def find_id(self, elem_id, callback):
js_code = javascript.assemble('webelem', 'element_by_id', elem_id)
js_cb = functools.partial(self._js_cb_single, callback)
self._tab.run_js_async(js_code, js_cb)
def find_focused(self, callback):
js_code = javascript.assemble('webelem', 'focus_element')
js_cb = functools.partial(self._js_cb_single, callback)
self._tab.run_js_async(js_code, js_cb)
def find_at_pos(self, pos, callback):
assert pos.x() >= 0
assert pos.y() >= 0
js_code = javascript.assemble('webelem', 'element_at_pos',
pos.x(), pos.y())
js_cb = functools.partial(self._js_cb_single, callback)
self._tab.run_js_async(js_code, js_cb)
class WebEngineTab(browsertab.AbstractTab):
"""A QtWebEngine tab in the browser."""
WIDGET_CLASS = QOpenGLWidget
def __init__(self, win_id, mode_manager, parent=None):
super().__init__(win_id=win_id, mode_manager=mode_manager,
parent=parent)
widget = webview.WebEngineView(tabdata=self.data, win_id=win_id)
self.history = WebEngineHistory(self)
self.scroller = WebEngineScroller(self, parent=self)
self.caret = WebEngineCaret(win_id=win_id, mode_manager=mode_manager,
tab=self, parent=self)
self.zoom = WebEngineZoom(win_id=win_id, parent=self)
self.search = WebEngineSearch(parent=self)
self.printing = WebEnginePrinting()
self.elements = WebEngineElements(self)
self._set_widget(widget)
self._connect_signals()
self.backend = usertypes.Backend.QtWebEngine
# init js stuff
self._init_js()
self._child_event_filter = None
def _init_js(self):
js_code = '\n'.join([
'"use strict";',
'window._qutebrowser = {};',
utils.read_file('javascript/scroll.js'),
utils.read_file('javascript/webelem.js'),
])
script = QWebEngineScript()
script.setInjectionPoint(QWebEngineScript.DocumentCreation)
script.setSourceCode(js_code)
page = self._widget.page()
try:
page.runJavaScript("", QWebEngineScript.ApplicationWorld)
except TypeError:
# We're unable to pass a world to runJavaScript
script.setWorldId(QWebEngineScript.MainWorld)
else:
script.setWorldId(QWebEngineScript.ApplicationWorld)
# FIXME:qtwebengine what about runsOnSubFrames?
page.scripts().insert(script)
def _install_event_filter(self):
self._widget.focusProxy().installEventFilter(self._mouse_event_filter)
self._child_event_filter = mouse.ChildEventFilter(
eventfilter=self._mouse_event_filter, widget=self._widget,
parent=self)
self._widget.installEventFilter(self._child_event_filter)
def openurl(self, url):
self._openurl_prepare(url)
self._widget.load(url)
def url(self, requested=False):
page = self._widget.page()
if requested:
return page.requestedUrl()
else:
return page.url()
def dump_async(self, callback, *, plain=False):
if plain:
self._widget.page().toPlainText(callback)
else:
self._widget.page().toHtml(callback)
def run_js_async(self, code, callback=None):
world = QWebEngineScript.ApplicationWorld
try:
if callback is None:
self._widget.page().runJavaScript(code, world)
else:
self._widget.page().runJavaScript(code, world, callback)
except TypeError:
# Qt < 5.7
if callback is None:
self._widget.page().runJavaScript(code)
else:
self._widget.page().runJavaScript(code, callback)
def has_js(self):
# QtWebEngine can run JS even if the page can't
return True
def shutdown(self):
log.stub()
def reload(self, *, force=False):
if force:
action = QWebEnginePage.ReloadAndBypassCache
else:
action = QWebEnginePage.Reload
self._widget.triggerPageAction(action)
def stop(self):
self._widget.stop()
def title(self):
return self._widget.title()
def icon(self):
try:
return self._widget.icon()
except AttributeError:
log.stub('on Qt < 5.7')
return QIcon()
def set_html(self, html, base_url):
# FIXME:qtwebengine
# check this and raise an exception if too big:
# Warning: The content will be percent encoded before being sent to the
# renderer via IPC. This may increase its size. The maximum size of the
# percent encoded content is 2 megabytes minus 30 bytes.
self._widget.setHtml(html, base_url)
def clear_ssl_errors(self):
log.stub()
@pyqtSlot()
def _on_history_trigger(self):
url = self.url()
requested_url = self.url(requested=True)
# Don't save the title if it's generated from the URL
title = self.title()
title_url = QUrl(url)
title_url.setScheme('')
if title == title_url.toDisplayString(QUrl.RemoveScheme).strip('/'):
title = ""
# Don't add history entry if the URL is invalid anyways
if not url.isValid():
log.misc.debug("Ignoring invalid URL being added to history")
return
self.add_history_item.emit(url, requested_url, title)
def _connect_signals(self):
view = self._widget
page = view.page()
page.windowCloseRequested.connect(self.window_close_requested)
page.linkHovered.connect(self.link_hovered)
page.loadProgress.connect(self._on_load_progress)
page.loadStarted.connect(self._on_load_started)
page.loadFinished.connect(self._on_history_trigger)
view.titleChanged.connect(self.title_changed)
view.urlChanged.connect(self._on_url_changed)
page.loadFinished.connect(self._on_load_finished)
page.certificate_error.connect(self._on_ssl_errors)
page.link_clicked.connect(self._on_link_clicked)
try:
view.iconChanged.connect(self.icon_changed)
except AttributeError:
log.stub('iconChanged, on Qt < 5.7')
try:
page.contentsSizeChanged.connect(self.contents_size_changed)
except AttributeError:
log.stub('contentsSizeChanged, on Qt < 5.7')
def _event_target(self):
return self._widget.focusProxy()