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import sys
from PySide2.QtWebEngineWidgets import QWebEnginePage, QWebEngineView

from PySide2 import QtCore

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

class WebEngineView(QWebEngineView):

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

    @staticmethod
    def webActions():
        return _webActions

    @staticmethod
    def minimumZoomFactor():
        return 0.25

    @staticmethod
    def maximumZoomFactor():
        return 5

    def __init__(self, tabFactoryFunc, windowFactoryFunc):
        super(WebEngineView, self).__init__()
        self._tabFactoryFunc = tabFactoryFunc
        self._windowFactoryFunc = windowFactoryFunc
        page = self.page()
        self._actions = {}
        for webAction in WebEngineView.webActions():
            action = page.action(webAction)
            action.changed.connect(self._enabledChanged)
            self._actions[action] = webAction

    def isWebActionEnabled(self, webAction):
        return self.page().action(webAction).isEnabled()

    def createWindow(self, windowType):
        if windowType == QWebEnginePage.WebBrowserTab or windowType == QWebEnginePage.WebBrowserBackgroundTab:
            return self._tabFactoryFunc()
        return self._windowFactoryFunc()

    def _enabledChanged(self):
        action = self.sender()
        webAction = self._actions[action]
        self.enabledChanged.emit(webAction, action.isEnabled())