WebBrowser/WebBrowserTabWidget.py

branch
QtWebEngine
changeset 4709
8612533a223f
parent 4631
5c1a96925da4
child 4713
8dca047daf4b
diff -r bd7d781db729 -r 8612533a223f WebBrowser/WebBrowserTabWidget.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebBrowser/WebBrowserTabWidget.py	Sun Jan 31 18:48:43 2016 +0100
@@ -0,0 +1,1038 @@
+# -*- 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
+
+# TODO: implement this
+from .WebBrowserView import WebBrowserView
+
+import UI.PixmapCache
+
+import Utilities
+import Preferences
+
+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__(self, parent, dnd=True)
+        
+        # TODO: implement this
+        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)
+        
+        # TODO: re-enable once Closed Tabs Manager is done
+##        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)
+        
+        # TODO: re-enable once Closed Tabs Manager is done
+##        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)
+##        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: remove requestData from signature
+    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 tuple containing the request data (QNetworkRequest,
+            QNetworkAccessManager.Operation, QByteArray)
+        @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 Helpviewer.HelpWindow
+##            from .History.HistoryCompleter import HistoryCompletionModel, \
+##                HistoryCompleter
+##            self.__historyCompletionModel = HistoryCompletionModel(self)
+##            self.__historyCompletionModel.setSourceModel(
+##                Helpviewer.HelpWindow.HelpWindow.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.iconUrlChanged.connect(self.__iconUrlChanged)
+        browser.search.connect(self.newBrowser)
+        browser.page().windowCloseRequested.connect(
+            self.__windowCloseRequested)
+##        browser.page().printRequested.connect(self.__printRequested)
+        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 not linkName:
+            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)
+    
+    # TODO: remove requestData from signature
+    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 tuple containing the request data (QNetworkRequest,
+            QNetworkAccessManager.Operation, QByteArray)
+        """
+        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):
+        """
+        Public slot called to handle the close all action.
+        """
+        for index in range(self.count() - 1, -1, -1):
+            self.closeBrowserAt(index)
+    
+    def closeBrowserAt(self, index):
+        """
+        Public slot to close a browser based on its index.
+        
+        @param index index of browser to close (integer)
+        """
+        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()
+        browser.home()
+        self.removeTab(index)
+        self.browserClosed.emit(browser)
+        browser.deleteLater()
+        del browser
+        
+        if self.count() == 0:
+            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()
+##        
+##        self.__printRequested(browser.page().mainFrame())
+##    
+##    def __printRequested(self, frame):
+##        """
+##        Private slot to handle a print request.
+##        
+##        @param frame reference to the frame to be printed (QWebFrame)
+##        """
+##        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)
+##        
+##        printDialog = QPrintDialog(printer, self)
+##        if printDialog.exec_() == QDialog.Accepted:
+##            try:
+##                frame.print_(printer)
+##            except AttributeError:
+##                E5MessageBox.critical(
+##                    self,
+##                    self.tr("eric6 Web Browser"),
+##                    self.tr(
+##                        """<p>Printing is not available due to a bug in"""
+##                        """ PyQt5. Please upgrade.</p>"""))
+##                return
+##    
+##    @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()
+##        
+##        self.__printPdfRequested(browser.page().mainFrame())
+##    
+##    def __printPdfRequested(self, frame):
+##        """
+##        Private slot to handle a print to PDF request.
+##        
+##        @param frame reference to the frame to be printed (QWebFrame)
+##        """
+##        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 = frame.url().path().rsplit('/', 1)[-1]
+##        if name:
+##            name = name.rsplit('.', 1)[0]
+##            name += '.pdf'
+##            printer.setOutputFileName(name)
+##        
+##        printDialog = QPrintDialog(printer, self)
+##        if printDialog.exec_() == QDialog.Accepted:
+##            try:
+##                frame.print_(printer)
+##            except AttributeError:
+##                E5MessageBox.critical(
+##                    self,
+##                    self.tr("eric6 Web Browser"),
+##                    self.tr(
+##                        """<p>Printing is not available due to a bug in"""
+##                        """ PyQt5. Please upgrade.</p>"""))
+##                return
+##    
+##    @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)
+##        
+##        self.__printPreviewBrowser = browser
+##        preview = QPrintPreviewDialog(printer, self)
+##        preview.paintRequested.connect(self.__printPreview)
+##        preview.exec_()
+##    
+##    def __printPreview(self, printer):
+##        """
+##        Private slot to generate a print preview.
+##        
+##        @param printer reference to the printer object (QPrinter)
+##        """
+##        try:
+##            self.__printPreviewBrowser.print_(printer)
+##        except AttributeError:
+##            E5MessageBox.critical(
+##                self,
+##                self.tr("eric6 Web Browser"),
+##                self.tr(
+##                    """<p>Printing is not available due to a bug in PyQt5."""
+##                    """Please upgrade.</p>"""))
+##            return
+##    
+    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 __iconUrlChanged(self, url):
+        """
+        Private slot to handle a change of the icon URL.
+        
+        @param url URL of the icon
+        @type QUrl
+        """
+        browser = self.sender()
+        
+        if browser is not None and isinstance(browser, QWidget):
+            import WebBrowser.WebBrowserWindow
+            self.setTabIcon(
+                self.indexOf(browser),
+                WebBrowser.WebBrowserWindow.WebBrowserWindow.icon(url))
+            WebBrowser.WebBrowserWindow.WebBrowserWindow.bookmarksManager()\
+                .iconChanged(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.getHelp("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)
+        """
+        # TODO: re-enable once Open Search is done
+##        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()
+    
+    # TODO: re-enable once Closed Tabs Manager is done
+##    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)

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