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import sys
from PySide2.QtWebEngineWidgets import QWebEnginePage, QWebEngineView

from PySide2 import QtCore

_web_actions = [QWebEnginePage.Back, QWebEnginePage.Forward,
               QWebEnginePage.Reload,
               QWebEnginePage.Undo, QWebEnginePage.Redo,
               QWebEnginePage.Cut, QWebEnginePage.Copy,
               QWebEnginePage.Paste, QWebEnginePage.SelectAll]

class WebEngineView(QWebEngineView):

    enabled_changed = QtCore.Signal(QWebEnginePage.WebAction, bool)

    @staticmethod
    def web_actions():
        return _web_actions

    @staticmethod
    def minimum_zoom_factor():
        return 0.25

    @staticmethod
    def maximum_zoom_factor():
        return 5

    def __init__(self, tab_factory_func, window_factory_func):
        super(WebEngineView, self).__init__()
        self._tab_factory_func = tab_factory_func
        self._window_factory_func = window_factory_func
        page = self.page()
        self._actions = {}
        for web_action in WebEngineView.web_actions():
            action = page.action(web_action)
            action.changed.connect(self._enabled_changed)
            self._actions[action] = web_action

    def is_web_action_enabled(self, web_action):
        return self.page().action(web_action).isEnabled()

    def create_window(self, window_type):
        if window_type == QWebEnginePage.WebBrowserTab or window_type == QWebEnginePage.WebBrowserBackgroundTab:
            return self._tab_factory_func()
        return self._window_factory_func()

    def _enabled_changed(self):
        action = self.sender()
        web_action = self._actions[action]
        self.enabled_changed.emit(web_action, action.isEnabled())
