Mercurial Repositories > eric / file revision

# -*- coding: utf-8 -*-

# Copyright (c) 2010 - 2016 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the central widget showing the web pages.
"""

from __future__ import unicode_literals

import os

from PyQt5.QtCore import pyqtSignal, pyqtSlot, Qt, QUrl
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QWidget, QHBoxLayout, QMenu, QToolButton, QDialog
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog
##from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest

from E5Gui.E5TabWidget import E5TabWidget
from E5Gui import E5MessageBox
from E5Gui.E5Application import e5App

from .WebBrowserView import WebBrowserView
from .Tools import WebBrowserTools
from . import WebInspector

import UI.PixmapCache

import Utilities
import Preferences
import Globals

from eric6config import getConfig


class WebBrowserTabWidget(E5TabWidget):
    """
    Class implementing the central widget showing the web pages.
    
    @signal sourceChanged(WebBrowserView, QUrl) emitted after the URL of a
        browser has changed
    @signal titleChanged(WebBrowserView, str) emitted after the title of a
        browser has changed
    @signal showMessage(str) emitted to show a message in the main window
        status bar
    @signal browserClosed(QWidget) emitted after a browser was closed
    @signal browserZoomValueChanged(int) emitted to signal a change of the
        current browser's zoom level
    """
    sourceChanged = pyqtSignal(WebBrowserView, QUrl)
    titleChanged = pyqtSignal(WebBrowserView, str)
    showMessage = pyqtSignal(str)
    browserClosed = pyqtSignal(QWidget)
    browserZoomValueChanged = pyqtSignal(int)
    
    def __init__(self, parent):
        """
        Constructor
        
        @param parent reference to the parent widget (QWidget)
        """
        super(WebBrowserTabWidget, self).__init__(parent, dnd=True)
        
        from .WebBrowserTabBar import WebBrowserTabBar
        self.__tabBar = WebBrowserTabBar(self)
        self.setCustomTabBar(True, self.__tabBar)
        
        self.__mainWindow = parent
        
        self.setUsesScrollButtons(True)
        self.setDocumentMode(True)
        self.setElideMode(Qt.ElideNone)
        
        from .ClosedTabsManager import ClosedTabsManager
        self.__closedTabsManager = ClosedTabsManager(self)
        self.__closedTabsManager.closedTabAvailable.connect(
            self.__closedTabAvailable)
        
        from .UrlBar.StackedUrlBar import StackedUrlBar
        self.__stackedUrlBar = StackedUrlBar(self)
        self.__tabBar.tabMoved.connect(self.__stackedUrlBar.moveBar)
        
        self.__tabContextMenuIndex = -1
        self.currentChanged[int].connect(self.__currentChanged)
        self.setTabContextMenuPolicy(Qt.CustomContextMenu)
        self.customTabContextMenuRequested.connect(self.__showContextMenu)
        
        self.__rightCornerWidget = QWidget(self)
        self.__rightCornerWidgetLayout = QHBoxLayout(self.__rightCornerWidget)
        self.__rightCornerWidgetLayout.setContentsMargins(0, 0, 0, 0)
        self.__rightCornerWidgetLayout.setSpacing(0)
        
        self.__navigationMenu = QMenu(self)
        self.__navigationMenu.aboutToShow.connect(self.__showNavigationMenu)
        self.__navigationMenu.triggered.connect(self.__navigationMenuTriggered)
        
        self.__navigationButton = QToolButton(self)
        self.__navigationButton.setIcon(
            UI.PixmapCache.getIcon("1downarrow.png"))
        self.__navigationButton.setToolTip(
            self.tr("Show a navigation menu"))
        self.__navigationButton.setPopupMode(QToolButton.InstantPopup)
        self.__navigationButton.setMenu(self.__navigationMenu)
        self.__navigationButton.setEnabled(False)
        self.__rightCornerWidgetLayout.addWidget(self.__navigationButton)
        
        self.__closedTabsMenu = QMenu(self)
        self.__closedTabsMenu.aboutToShow.connect(
            self.__aboutToShowClosedTabsMenu)
        
        self.__closedTabsButton = QToolButton(self)
        self.__closedTabsButton.setIcon(UI.PixmapCache.getIcon("trash.png"))
        self.__closedTabsButton.setToolTip(
            self.tr("Show a navigation menu for closed tabs"))
        self.__closedTabsButton.setPopupMode(QToolButton.InstantPopup)
        self.__closedTabsButton.setMenu(self.__closedTabsMenu)
        self.__closedTabsButton.setEnabled(False)
        self.__rightCornerWidgetLayout.addWidget(self.__closedTabsButton)
        
        self.__closeButton = QToolButton(self)
        self.__closeButton.setIcon(UI.PixmapCache.getIcon("close.png"))
        self.__closeButton.setToolTip(
            self.tr("Close the current web browser"))
        self.__closeButton.setEnabled(False)
        self.__closeButton.clicked.connect(self.closeBrowser)
        self.__rightCornerWidgetLayout.addWidget(self.__closeButton)
        if Preferences.getUI("SingleCloseButton") or \
           not hasattr(self, 'setTabsClosable'):
            self.__closeButton.show()
        else:
            self.setTabsClosable(True)
            self.tabCloseRequested.connect(self.closeBrowserAt)
            self.__closeButton.hide()
        
        self.setCornerWidget(self.__rightCornerWidget, Qt.TopRightCorner)
        
        self.__newTabButton = QToolButton(self)
        self.__newTabButton.setIcon(UI.PixmapCache.getIcon("plus.png"))
        self.__newTabButton.setToolTip(
            self.tr("Open a new web browser tab"))
        self.setCornerWidget(self.__newTabButton, Qt.TopLeftCorner)
        self.__newTabButton.clicked.connect(self.__newBrowser)
        
        self.__initTabContextMenu()
        
        self.__historyCompleter = None
    
    def __initTabContextMenu(self):
        """
        Private method to create the tab context menu.
        """
        self.__tabContextMenu = QMenu(self)
        self.tabContextNewAct = self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("tabNew.png"),
            self.tr('New Tab'), self.newBrowser)
        self.__tabContextMenu.addSeparator()
        self.leftMenuAct = self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("1leftarrow.png"),
            self.tr('Move Left'), self.__tabContextMenuMoveLeft)
        self.rightMenuAct = self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("1rightarrow.png"),
            self.tr('Move Right'), self.__tabContextMenuMoveRight)
        self.__tabContextMenu.addSeparator()
        self.tabContextCloneAct = self.__tabContextMenu.addAction(
            self.tr("Duplicate Page"), self.__tabContextMenuClone)
        self.__tabContextMenu.addSeparator()
        self.tabContextCloseAct = self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("tabClose.png"),
            self.tr('Close'), self.__tabContextMenuClose)
        self.tabContextCloseOthersAct = self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("tabCloseOther.png"),
            self.tr("Close Others"), self.__tabContextMenuCloseOthers)
        self.__tabContextMenu.addAction(
            self.tr('Close All'), self.closeAllBrowsers)
        self.__tabContextMenu.addSeparator()
        self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("printPreview.png"),
            self.tr('Print Preview'), self.__tabContextMenuPrintPreview)
        self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("print.png"),
            self.tr('Print'), self.__tabContextMenuPrint)
        if Globals.isLinuxPlatform():
            self.__tabContextMenu.addAction(
                UI.PixmapCache.getIcon("printPdf.png"),
                self.tr('Print as PDF'), self.__tabContextMenuPrintPdf)
        self.__tabContextMenu.addSeparator()
        self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("reload.png"),
            self.tr('Reload All'), self.reloadAllBrowsers)
        self.__tabContextMenu.addSeparator()
        self.__tabContextMenu.addAction(
            UI.PixmapCache.getIcon("addBookmark.png"),
            self.tr('Bookmark All Tabs'), self.__mainWindow.bookmarkAll)
        
        self.__tabBackContextMenu = QMenu(self)
        self.__tabBackContextMenu.addAction(
            self.tr('Close All'), self.closeAllBrowsers)
        self.__tabBackContextMenu.addAction(
            UI.PixmapCache.getIcon("reload.png"),
            self.tr('Reload All'), self.reloadAllBrowsers)
        self.__tabBackContextMenu.addAction(
            UI.PixmapCache.getIcon("addBookmark.png"),
            self.tr('Bookmark All Tabs'), self.__mainWindow.bookmarkAll)
        self.__tabBackContextMenu.addSeparator()
        self.__restoreClosedTabAct = self.__tabBackContextMenu.addAction(
            UI.PixmapCache.getIcon("trash.png"),
            self.tr('Restore Closed Tab'), self.restoreClosedTab)
        self.__restoreClosedTabAct.setEnabled(False)
        self.__restoreClosedTabAct.setData(0)
    
    def __showContextMenu(self, coord, index):
        """
        Private slot to show the tab context menu.
        
        @param coord the position of the mouse pointer (QPoint)
        @param index index of the tab the menu is requested for (integer)
        """
        coord = self.mapToGlobal(coord)
        if index == -1:
            self.__tabBackContextMenu.popup(coord)
        else:
            self.__tabContextMenuIndex = index
            self.leftMenuAct.setEnabled(index > 0)
            self.rightMenuAct.setEnabled(index < self.count() - 1)
            
            self.tabContextCloseOthersAct.setEnabled(self.count() > 1)
            
            self.__tabContextMenu.popup(coord)
    
    def __tabContextMenuMoveLeft(self):
        """
        Private method to move a tab one position to the left.
        """
        self.moveTab(self.__tabContextMenuIndex,
                     self.__tabContextMenuIndex - 1)
    
    def __tabContextMenuMoveRight(self):
        """
        Private method to move a tab one position to the right.
        """
        self.moveTab(self.__tabContextMenuIndex,
                     self.__tabContextMenuIndex + 1)
    
    def __tabContextMenuClone(self):
        """
        Private method to clone the selected tab.
        """
        idx = self.__tabContextMenuIndex
        if idx < 0:
            idx = self.currentIndex()
        if idx < 0 or idx > self.count():
            return
        
##        req = QNetworkRequest(self.widget(idx).url())
##        req.setRawHeader(b"X-Eric6-UserLoadAction", b"1")
##        self.newBrowser(None, (req, QNetworkAccessManager.GetOperation, b""))
        url = self.widget(idx).url()
        self.newBrowser(url)
    
    def __tabContextMenuClose(self):
        """
        Private method to close the selected tab.
        """
        self.closeBrowserAt(self.__tabContextMenuIndex)
    
    def __tabContextMenuCloseOthers(self):
        """
        Private slot to close all other tabs.
        """
        index = self.__tabContextMenuIndex
        for i in list(range(self.count() - 1, index, -1)) + \
                list(range(index - 1, -1, -1)):
            self.closeBrowserAt(i)
    
    def __tabContextMenuPrint(self):
        """
        Private method to print the selected tab.
        """
        browser = self.widget(self.__tabContextMenuIndex)
        self.printBrowser(browser)
    
    def __tabContextMenuPrintPdf(self):
        """
        Private method to print the selected tab as PDF.
        """
        browser = self.widget(self.__tabContextMenuIndex)
        self.printBrowserPdf(browser)
    
    def __tabContextMenuPrintPreview(self):
        """
        Private method to show a print preview of the selected tab.
        """
        browser = self.widget(self.__tabContextMenuIndex)
        self.printPreviewBrowser(browser)
    
    @pyqtSlot()
    def __newBrowser(self):
        """
        Private slot to open a new browser tab.
        """
        self.newBrowser()
    
    # TODO: get rid of requestData
    def newBrowser(self, link=None, requestData=None, position=-1):
        """
        Public method to create a new web browser tab.
        
        @param link link to be shown (string or QUrl)
        @param requestData page load request data (LoadRequest)
        @keyparam position position to create the new tab at or -1 to add it
            to the end (integer)
        """
        if link is None:
            linkName = ""
        elif isinstance(link, QUrl):
            linkName = link.toString()
        else:
            linkName = link
        
        from .UrlBar.UrlBar import UrlBar
        urlbar = UrlBar(self.__mainWindow, self)
        if self.__historyCompleter is None:
            import WebBrowser.WebBrowserWindow
            from .History.HistoryCompleter import HistoryCompletionModel, \
                HistoryCompleter
            self.__historyCompletionModel = HistoryCompletionModel(self)
            self.__historyCompletionModel.setSourceModel(
                WebBrowser.WebBrowserWindow.WebBrowserWindow.historyManager()
                .historyFilterModel())
            self.__historyCompleter = HistoryCompleter(
                self.__historyCompletionModel, self)
            self.__historyCompleter.activated[str].connect(self.__pathSelected)
        urlbar.setCompleter(self.__historyCompleter)
        urlbar.returnPressed.connect(self.__lineEditReturnPressed)
        if position == -1:
            self.__stackedUrlBar.addWidget(urlbar)
        else:
            self.__stackedUrlBar.insertWidget(position, urlbar)
        
        browser = WebBrowserView(self.__mainWindow, self)
        urlbar.setBrowser(browser)
        
        browser.sourceChanged.connect(self.__sourceChanged)
        browser.titleChanged.connect(self.__titleChanged)
        browser.highlighted.connect(self.showMessage)
        browser.backwardAvailable.connect(
            self.__mainWindow.setBackwardAvailable)
        browser.forwardAvailable.connect(self.__mainWindow.setForwardAvailable)
        browser.loadStarted.connect(self.__loadStarted)
        browser.loadFinished.connect(self.__loadFinished)
        browser.iconChanged.connect(self.__iconChanged)
        browser.search.connect(self.newBrowser)
        browser.page().windowCloseRequested.connect(
            self.__windowCloseRequested)
        browser.zoomValueChanged.connect(self.browserZoomValueChanged)
        
        if position == -1:
            index = self.addTab(browser, self.tr("..."))
        else:
            index = self.insertTab(position, browser, self.tr("..."))
        self.setCurrentIndex(index)
        
        self.__mainWindow.closeAct.setEnabled(True)
        self.__mainWindow.closeAllAct.setEnabled(True)
        self.__closeButton.setEnabled(True)
        self.__navigationButton.setEnabled(True)
        
        if not linkName and not requestData:
            if Preferences.getWebBrowser("StartupBehavior") == 0:
                linkName = Preferences.getWebBrowser("HomePage")
            elif Preferences.getWebBrowser("StartupBehavior") == 1:
                linkName = "eric:speeddial"
        
        if linkName:
            browser.setSource(QUrl(linkName))
            if not browser.documentTitle():
                self.setTabText(index, self.__elide(linkName, Qt.ElideMiddle))
                self.setTabToolTip(index, linkName)
            else:
                self.setTabText(
                    index,
                    self.__elide(browser.documentTitle().replace("&", "&&")))
                self.setTabToolTip(index, browser.documentTitle())
##        elif requestData:
##            browser.load(requestData)
    
    def newBrowserAfter(self, browser, link=None, requestData=None):
        """
        Public method to create a new web browser tab after a given one.
        
        @param browser reference to the browser to add after (WebBrowserView)
        @param link link to be shown (string or QUrl)
        @param requestData page load request data (LoadRequest)
        """
        if browser:
            position = self.indexOf(browser) + 1
        else:
            position = -1
        self.newBrowser(link, requestData, position)
    
    def __showNavigationMenu(self):
        """
        Private slot to show the navigation button menu.
        """
        self.__navigationMenu.clear()
        for index in range(self.count()):
            act = self.__navigationMenu.addAction(
                self.tabIcon(index), self.tabText(index))
            act.setData(index)
    
    def __navigationMenuTriggered(self, act):
        """
        Private slot called to handle the navigation button menu selection.
        
        @param act reference to the selected action (QAction)
        """
        index = act.data()
        if index is not None:
            self.setCurrentIndex(index)
    
    def __windowCloseRequested(self):
        """
        Private slot to handle the windowCloseRequested signal of a browser.
        """
        page = self.sender()
        if page is None:
            return
        
        browser = page.view()
        if browser is None:
            return
        
        index = self.indexOf(browser)
        self.closeBrowserAt(index)
    
    def reloadAllBrowsers(self):
        """
        Public slot to reload all browsers.
        """
        for index in range(self.count()):
            browser = self.widget(index)
            browser and browser.reload()
    
    @pyqtSlot()
    def closeBrowser(self):
        """
        Public slot called to handle the close action.
        """
        self.closeBrowserAt(self.currentIndex())
    
    def closeAllBrowsers(self, shutdown=False):
        """
        Public slot called to handle the close all action.
        
        @param shutdown flag indicating a shutdown action
        @type bool
        """
        for index in range(self.count() - 1, -1, -1):
            self.closeBrowserAt(index, shutdown=shutdown)
    
    def closeBrowserAt(self, index, shutdown=False):
        """
        Public slot to close a browser based on its index.
        
        @param index index of browser to close
        @type int
        @param shutdown flag indicating a shutdown action
        @type bool
        """
        browser = self.widget(index)
        if browser is None:
            return
        
##        if browser.isModified():
##            ok = E5MessageBox.yesNo(
##                self,
##                self.tr("Do you really want to close this page?"),
##                self.tr("""You have modified this page and when closing it"""
##                        """ you would lose the modification.\nDo you really"""
##                        """ want to close this page?"""))
##            if not ok:
##                return
##        
        urlbar = self.__stackedUrlBar.widget(index)
        self.__stackedUrlBar.removeWidget(urlbar)
        urlbar.deleteLater()
        del urlbar
        
        self.__closedTabsManager.recordBrowser(browser, index)
        
        browser.closeWebInspector()
        WebInspector.unregisterView(browser)
        self.removeTab(index)
        self.browserClosed.emit(browser)
        browser.deleteLater()
        del browser
        
        if self.count() == 0 and not shutdown:
            self.newBrowser()
        else:
            self.currentChanged[int].emit(self.currentIndex())
    
    def currentBrowser(self):
        """
        Public method to get a reference to the current browser.
        
        @return reference to the current browser (WebBrowserView)
        """
        return self.currentWidget()
    
    def browserAt(self, index):
        """
        Public method to get a reference to the browser with the given index.
        
        @param index index of the browser to get (integer)
        @return reference to the indexed browser (WebBrowserView)
        """
        return self.widget(index)
    
    def browsers(self):
        """
        Public method to get a list of references to all browsers.
        
        @return list of references to browsers (list of WebBrowserView)
        """
        li = []
        for index in range(self.count()):
            li.append(self.widget(index))
        return li
    
    @pyqtSlot()
    def printBrowser(self, browser=None):
        """
        Public slot called to print the displayed page.
        
        @param browser reference to the browser to be printed (WebBrowserView)
        """
        if browser is None:
            browser = self.currentBrowser()
        
        printer = QPrinter(mode=QPrinter.HighResolution)
        if Preferences.getPrinter("ColorMode"):
            printer.setColorMode(QPrinter.Color)
        else:
            printer.setColorMode(QPrinter.GrayScale)
        if Preferences.getPrinter("FirstPageFirst"):
            printer.setPageOrder(QPrinter.FirstPageFirst)
        else:
            printer.setPageOrder(QPrinter.LastPageFirst)
        printer.setPageMargins(
            Preferences.getPrinter("LeftMargin") * 10,
            Preferences.getPrinter("TopMargin") * 10,
            Preferences.getPrinter("RightMargin") * 10,
            Preferences.getPrinter("BottomMargin") * 10,
            QPrinter.Millimeter
        )
        printerName = Preferences.getPrinter("PrinterName")
        if printerName:
            printer.setPrinterName(printerName)
        printer.setResolution(Preferences.getPrinter("Resolution"))
        
        printDialog = QPrintDialog(printer, self)
        if printDialog.exec_() == QDialog.Accepted:
            browser.render(printer)
    
    @pyqtSlot()
    def printBrowserPdf(self, browser=None):
        """
        Public slot called to print the displayed page to PDF.
        
        @param browser reference to the browser to be printed (HelpBrowser)
        """
        if browser is None:
            browser = self.currentBrowser()
        
        printer = QPrinter(mode=QPrinter.HighResolution)
        if Preferences.getPrinter("ColorMode"):
            printer.setColorMode(QPrinter.Color)
        else:
            printer.setColorMode(QPrinter.GrayScale)
        printerName = Preferences.getPrinter("PrinterName")
        if printerName:
            printer.setPrinterName(printerName)
        printer.setOutputFormat(QPrinter.PdfFormat)
        name = WebBrowserTools.getFileNameFromUrl(browser.url())
        if name:
            name = name.rsplit('.', 1)[0]
            name += '.pdf'
            printer.setOutputFileName(name)
        printer.setResolution(Preferences.getPrinter("Resolution"))
        
        printDialog = QPrintDialog(printer, self)
        if printDialog.exec_() == QDialog.Accepted:
            browser.render(printer)
    
    @pyqtSlot()
    def printPreviewBrowser(self, browser=None):
        """
        Public slot called to show a print preview of the displayed file.
        
        @param browser reference to the browser to be printed (HelpBrowserWV)
        """
        from PyQt5.QtPrintSupport import QPrintPreviewDialog
        
        if browser is None:
            browser = self.currentBrowser()
        
        printer = QPrinter(mode=QPrinter.HighResolution)
        if Preferences.getPrinter("ColorMode"):
            printer.setColorMode(QPrinter.Color)
        else:
            printer.setColorMode(QPrinter.GrayScale)
        if Preferences.getPrinter("FirstPageFirst"):
            printer.setPageOrder(QPrinter.FirstPageFirst)
        else:
            printer.setPageOrder(QPrinter.LastPageFirst)
        printer.setPageMargins(
            Preferences.getPrinter("LeftMargin") * 10,
            Preferences.getPrinter("TopMargin") * 10,
            Preferences.getPrinter("RightMargin") * 10,
            Preferences.getPrinter("BottomMargin") * 10,
            QPrinter.Millimeter
        )
        printerName = Preferences.getPrinter("PrinterName")
        if printerName:
            printer.setPrinterName(printerName)
        printer.setResolution(Preferences.getPrinter("Resolution"))
        
        preview = QPrintPreviewDialog(printer, self)
        preview.paintRequested.connect(lambda p: browser.render(p))
        preview.exec_()
    
    def __sourceChanged(self, url):
        """
        Private slot to handle a change of a browsers source.
        
        @param url URL of the new site (QUrl)
        """
        browser = self.sender()
        
        if browser is not None:
            self.sourceChanged.emit(browser, url)
    
    def __titleChanged(self, title):
        """
        Private slot to handle a change of a browsers title.
        
        @param title new title (string)
        """
        browser = self.sender()
        
        if browser is not None and isinstance(browser, QWidget):
            index = self.indexOf(browser)
            if title == "":
                title = browser.url().toString()
            
            self.setTabText(index, self.__elide(title.replace("&", "&&")))
            self.setTabToolTip(index, title)
        
            self.titleChanged.emit(browser, title)
    
    def __elide(self, txt, mode=Qt.ElideRight, length=40):
        """
        Private method to elide some text.
        
        @param txt text to be elided (string)
        @keyparam mode elide mode (Qt.TextElideMode)
        @keyparam length amount of characters to be used (integer)
        @return the elided text (string)
        """
        if mode == Qt.ElideNone or len(txt) < length:
            return txt
        elif mode == Qt.ElideLeft:
            return "...{0}".format(txt[-length:])
        elif mode == Qt.ElideMiddle:
            return "{0}...{1}".format(txt[:length // 2], txt[-(length // 2):])
        elif mode == Qt.ElideRight:
            return "{0}...".format(txt[:length])
        else:
            # just in case
            return txt
    
    def preferencesChanged(self):
        """
        Public slot to handle a change of preferences.
        """
        for browser in self.browsers():
            browser.preferencesChanged()
        
        for urlbar in self.__stackedUrlBar.urlBars():
            urlbar.preferencesChanged()
        
        if Preferences.getUI("SingleCloseButton"):
            self.setTabsClosable(False)
            try:
                self.tabCloseRequested.disconnect(self.closeBrowserAt)
            except TypeError:
                pass
            self.__closeButton.show()
        else:
            self.setTabsClosable(True)
            self.tabCloseRequested.connect(self.closeBrowserAt)
            self.__closeButton.hide()
    
    def __loadStarted(self):
        """
        Private method to handle the loadStarted signal.
        """
        browser = self.sender()
        
        if browser is not None:
            index = self.indexOf(browser)
            anim = self.animationLabel(
                index, os.path.join(getConfig("ericPixDir"), "loading.gif"),
                100)
            if not anim:
                loading = QIcon(os.path.join(getConfig("ericPixDir"),
                                "loading.gif"))
                self.setTabIcon(index, loading)
            else:
                self.setTabIcon(index, QIcon())
            self.setTabText(index, self.tr("Loading..."))
            self.setTabToolTip(index, self.tr("Loading..."))
            self.showMessage.emit(self.tr("Loading..."))
            
            self.__mainWindow.setLoadingActions(True)
    
    def __loadFinished(self, ok):
        """
        Private method to handle the loadFinished signal.
        
        @param ok flag indicating the result (boolean)
        """
        browser = self.sender()
        if not isinstance(browser, WebBrowserView):
            return
        
        if browser is not None:
            import WebBrowser.WebBrowserWindow
            index = self.indexOf(browser)
            self.resetAnimation(index)
            self.setTabIcon(
                index, WebBrowser.WebBrowserWindow.WebBrowserWindow.icon(
                    browser.url()))
            if ok:
                self.showMessage.emit(self.tr("Finished loading"))
            else:
                self.showMessage.emit(self.tr("Failed to load"))
            
            self.__mainWindow.setLoadingActions(False)
    
    def __iconChanged(self):
        """
        Private slot to handle a change of the web site icon.
        """
        browser = self.sender()
        
        if browser is not None and isinstance(browser, QWidget):
            self.setTabIcon(
                self.indexOf(browser),
                browser.icon())
            self.__mainWindow.bookmarksManager().iconChanged(browser.url())
    
    def getSourceFileList(self):
        """
        Public method to get a list of all opened Qt help files.
        
        @return dictionary with tab id as key and host/namespace as value
        """
        sourceList = {}
        for i in range(self.count()):
            browser = self.widget(i)
            if browser is not None and \
               browser.source().isValid():
                sourceList[i] = browser.source().host()
        
        return sourceList
    
    def shallShutDown(self):
        """
        Public method to check, if the application should be shut down.
        
        @return flag indicating a shut down (boolean)
        """
        if self.count() > 1 and Preferences.getWebBrowser(
                "WarnOnMultipleClose"):
            mb = E5MessageBox.E5MessageBox(
                E5MessageBox.Information,
                self.tr("Are you sure you want to close the window?"),
                self.tr("""Are you sure you want to close the window?\n"""
                        """You have %n tab(s) open.""", "", self.count()),
                modal=True,
                parent=self)
            if self.__mainWindow.fromEric:
                quitButton = mb.addButton(
                    self.tr("&Close"), E5MessageBox.AcceptRole)
                quitButton.setIcon(UI.PixmapCache.getIcon("close.png"))
            else:
                quitButton = mb.addButton(
                    self.tr("&Quit"), E5MessageBox.AcceptRole)
                quitButton.setIcon(UI.PixmapCache.getIcon("exit.png"))
            closeTabButton = mb.addButton(
                self.tr("C&lose Current Tab"), E5MessageBox.AcceptRole)
            closeTabButton.setIcon(UI.PixmapCache.getIcon("tabClose.png"))
            mb.addButton(E5MessageBox.Cancel)
            mb.exec_()
            if mb.clickedButton() == quitButton:
                return True
            else:
                if mb.clickedButton() == closeTabButton:
                    self.closeBrowser()
                return False
        
        return True
    
    def stackedUrlBar(self):
        """
        Public method to get a reference to the stacked url bar.
        
        @return reference to the stacked url bar (StackedUrlBar)
        """
        return self.__stackedUrlBar
    
    def currentUrlBar(self):
        """
        Public method to get a reference to the current url bar.
        
        @return reference to the current url bar (UrlBar)
        """
        return self.__stackedUrlBar.currentWidget()
    
    def __lineEditReturnPressed(self):
        """
        Private slot to handle the entering of an URL.
        """
        edit = self.sender()
        url = self.__guessUrlFromPath(edit.text())
##        request = QNetworkRequest(url)
##        request.setRawHeader(b"X-Eric6-UserLoadAction", b"1")
        if e5App().keyboardModifiers() == Qt.AltModifier:
            self.newBrowser(url)
##            self.newBrowser(
##                None, (request, QNetworkAccessManager.GetOperation, b""))
        else:
            self.currentBrowser().setSource(url)
##            self.currentBrowser().setSource(
##                None, (request, QNetworkAccessManager.GetOperation, b""))
            self.currentBrowser().setFocus()
    
    def __pathSelected(self, path):
        """
        Private slot called when a URL is selected from the completer.
        
        @param path path to be shown (string)
        """
        url = self.__guessUrlFromPath(path)
        self.currentBrowser().setSource(url)
    
    def __guessUrlFromPath(self, path):
        """
        Private method to guess an URL given a path string.
        
        @param path path string to guess an URL for (string)
        @return guessed URL (QUrl)
        """
        manager = self.__mainWindow.openSearchManager()
        path = Utilities.fromNativeSeparators(path)
        url = manager.convertKeywordSearchToUrl(path)
        if url.isValid():
            return url
        
        try:
            url = QUrl.fromUserInput(path)
        except AttributeError:
            url = QUrl(path)
        
        if url.scheme() == "about" and \
           url.path() == "home":
            url = QUrl("eric:home")
        
        # TODO: extend this logic to about:config (open config dialog)
        
        if url.scheme() in ["s", "search"]:
            url = manager.currentEngine().searchUrl(url.path().strip())
        
        if url.scheme() != "" and \
           (url.host() != "" or url.path() != ""):
            return url
        
        urlString = Preferences.getWebBrowser("DefaultScheme") + path.strip()
        url = QUrl.fromEncoded(urlString.encode("utf-8"), QUrl.TolerantMode)
        
        return url
    
    def __currentChanged(self, index):
        """
        Private slot to handle an index change.
        
        @param index new index (integer)
        """
        self.__stackedUrlBar.setCurrentIndex(index)
        
        browser = self.browserAt(index)
        if browser is not None:
            if browser.url() == "" and browser.hasFocus():
                self.__stackedUrlBar.currentWidget.setFocus()
            elif browser.url() != "":
                browser.setFocus()
    
    def restoreClosedTab(self):
        """
        Public slot to restore the most recently closed tab.
        """
        if not self.canRestoreClosedTab():
            return
        
        act = self.sender()
        tab = self.__closedTabsManager.getClosedTabAt(act.data())
        
        self.newBrowser(tab.url.toString(), position=tab.position)
    
    def canRestoreClosedTab(self):
        """
        Public method to check, if closed tabs can be restored.
        
        @return flag indicating that closed tabs can be restored (boolean)
        """
        return self.__closedTabsManager.isClosedTabAvailable()
    
    def restoreAllClosedTabs(self):
        """
        Public slot to restore all closed tabs.
        """
        if not self.canRestoreClosedTab():
            return
        
        for tab in self.__closedTabsManager.allClosedTabs():
            self.newBrowser(tab.url.toString(), position=tab.position)
        self.__closedTabsManager.clearList()
    
    def clearClosedTabsList(self):
        """
        Public slot to clear the list of closed tabs.
        """
        self.__closedTabsManager.clearList()
    
    def __aboutToShowClosedTabsMenu(self):
        """
        Private slot to populate the closed tabs menu.
        """
        fm = self.__closedTabsMenu.fontMetrics()
        maxWidth = fm.width('m') * 40
        
        self.__closedTabsMenu.clear()
        index = 0
        for tab in self.__closedTabsManager.allClosedTabs():
            title = fm.elidedText(tab.title, Qt.ElideRight, maxWidth)
            self.__closedTabsMenu.addAction(
                self.__mainWindow.icon(tab.url), title,
                self.restoreClosedTab).setData(index)
            index += 1
        self.__closedTabsMenu.addSeparator()
        self.__closedTabsMenu.addAction(
            self.tr("Restore All Closed Tabs"), self.restoreAllClosedTabs)
        self.__closedTabsMenu.addAction(
            self.tr("Clear List"), self.clearClosedTabsList)
    
    def closedTabsManager(self):
        """
        Public slot to get a reference to the closed tabs manager.
        
        @return reference to the closed tabs manager (ClosedTabsManager)
        """
        return self.__closedTabsManager
    
    def __closedTabAvailable(self, avail):
        """
        Private slot to handle changes of the availability of closed tabs.
        
        @param avail flag indicating the availability of closed tabs (boolean)
        """
        self.__closedTabsButton.setEnabled(avail)
        self.__restoreClosedTabAct.setEnabled(avail)