This file is indexed.

/usr/lib/python2.7/dist-packages/qtconsole/mainwindow.py is in python-qtconsole 4.2.1-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
"""The Qt MainWindow for the QtConsole

This is a tabbed pseudo-terminal of Jupyter sessions, with a menu bar for
common actions.
"""

# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.

import sys
import webbrowser
from threading import Thread

from qtconsole.qt import QtGui,QtCore
from qtconsole.usage import gui_reference


def background(f):
    """call a function in a simple thread, to prevent blocking"""
    t = Thread(target=f)
    t.start()
    return t


class MainWindow(QtGui.QMainWindow):

    #---------------------------------------------------------------------------
    # 'object' interface
    #---------------------------------------------------------------------------

    def __init__(self, app,
                    confirm_exit=True,
                    new_frontend_factory=None, slave_frontend_factory=None,
                ):
        """ Create a tabbed MainWindow for managing FrontendWidgets
        
        Parameters
        ----------
        
        app : reference to QApplication parent
        confirm_exit : bool, optional
            Whether we should prompt on close of tabs
        new_frontend_factory : callable
            A callable that returns a new JupyterWidget instance, attached to
            its own running kernel.
        slave_frontend_factory : callable
            A callable that takes an existing JupyterWidget, and  returns a new 
            JupyterWidget instance, attached to the same kernel.
        """

        super(MainWindow, self).__init__()
        self._kernel_counter = 0
        self._app = app
        self.confirm_exit = confirm_exit
        self.new_frontend_factory = new_frontend_factory
        self.slave_frontend_factory = slave_frontend_factory

        self.tab_widget = QtGui.QTabWidget(self)
        self.tab_widget.setDocumentMode(True)
        self.tab_widget.setTabsClosable(True)
        self.tab_widget.tabCloseRequested[int].connect(self.close_tab)

        self.setCentralWidget(self.tab_widget)
        # hide tab bar at first, since we have no tabs:
        self.tab_widget.tabBar().setVisible(False)
        # prevent focus in tab bar
        self.tab_widget.setFocusPolicy(QtCore.Qt.NoFocus)

    def update_tab_bar_visibility(self):
        """ update visibility of the tabBar depending of the number of tab

        0 or 1 tab, tabBar hidden
        2+ tabs, tabBar visible

        send a self.close if number of tab ==0

        need to be called explicitly, or be connected to tabInserted/tabRemoved
        """
        if self.tab_widget.count() <= 1:
            self.tab_widget.tabBar().setVisible(False)
        else:
            self.tab_widget.tabBar().setVisible(True)
        if self.tab_widget.count()==0 :
            self.close()

    @property
    def next_kernel_id(self):
        """constantly increasing counter for kernel IDs"""
        c = self._kernel_counter
        self._kernel_counter += 1
        return c

    @property
    def active_frontend(self):
        return self.tab_widget.currentWidget()
    
    def create_tab_with_new_frontend(self):
        """create a new frontend and attach it to a new tab"""
        widget = self.new_frontend_factory()
        self.add_tab_with_frontend(widget)
    
    def create_tab_with_current_kernel(self):
        """create a new frontend attached to the same kernel as the current tab"""
        current_widget = self.tab_widget.currentWidget()
        current_widget_index = self.tab_widget.indexOf(current_widget)
        current_widget_name = self.tab_widget.tabText(current_widget_index)
        widget = self.slave_frontend_factory(current_widget)
        if 'slave' in current_widget_name:
            # don't keep stacking slaves
            name = current_widget_name
        else:
            name = '(%s) slave' % current_widget_name
        self.add_tab_with_frontend(widget,name=name)

    def close_tab(self,current_tab):
        """ Called when you need to try to close a tab.

        It takes the number of the tab to be closed as argument, or a reference
        to the widget inside this tab
        """

        # let's be sure "tab" and "closing widget" are respectively the index
        # of the tab to close and a reference to the frontend to close
        if type(current_tab) is not int :
            current_tab = self.tab_widget.indexOf(current_tab)
        closing_widget=self.tab_widget.widget(current_tab)


        # when trying to be closed, widget might re-send a request to be
        # closed again, but will be deleted when event will be processed. So
        # need to check that widget still exists and skip if not. One example
        # of this is when 'exit' is sent in a slave tab. 'exit' will be
        # re-sent by this function on the master widget, which ask all slave
        # widgets to exit
        if closing_widget is None:
            return

        #get a list of all slave widgets on the same kernel.
        slave_tabs = self.find_slave_widgets(closing_widget)

        keepkernel = None #Use the prompt by default
        if hasattr(closing_widget,'_keep_kernel_on_exit'): #set by exit magic
            keepkernel = closing_widget._keep_kernel_on_exit
            # If signal sent by exit magic (_keep_kernel_on_exit, exist and not None)
            # we set local slave tabs._hidden to True to avoid prompting for kernel
            # restart when they get the signal. and then "forward" the 'exit'
            # to the main window
            if keepkernel is not None:
                for tab in slave_tabs:
                    tab._hidden = True
                if closing_widget in slave_tabs:
                    try :
                        self.find_master_tab(closing_widget).execute('exit')
                    except AttributeError:
                        self.log.info("Master already closed or not local, closing only current tab")
                        self.tab_widget.removeTab(current_tab)
                    self.update_tab_bar_visibility()
                    return

        kernel_client = closing_widget.kernel_client
        kernel_manager = closing_widget.kernel_manager

        if keepkernel is None and not closing_widget._confirm_exit:
            # don't prompt, just terminate the kernel if we own it
            # or leave it alone if we don't
            keepkernel = closing_widget._existing
        if keepkernel is None: #show prompt
            if kernel_client and kernel_client.channels_running:
                title = self.window().windowTitle()
                cancel = QtGui.QMessageBox.Cancel
                okay = QtGui.QMessageBox.Ok
                if closing_widget._may_close:
                    msg = "You are closing the tab : "+'"'+self.tab_widget.tabText(current_tab)+'"'
                    info = "Would you like to quit the Kernel and close all attached Consoles as well?"
                    justthis = QtGui.QPushButton("&No, just this Tab", self)
                    justthis.setShortcut('N')
                    closeall = QtGui.QPushButton("&Yes, close all", self)
                    closeall.setShortcut('Y')
                    # allow ctrl-d ctrl-d exit, like in terminal
                    closeall.setShortcut('Ctrl+D')
                    box = QtGui.QMessageBox(QtGui.QMessageBox.Question,
                                            title, msg)
                    box.setInformativeText(info)
                    box.addButton(cancel)
                    box.addButton(justthis, QtGui.QMessageBox.NoRole)
                    box.addButton(closeall, QtGui.QMessageBox.YesRole)
                    box.setDefaultButton(closeall)
                    box.setEscapeButton(cancel)
                    pixmap = QtGui.QPixmap(self._app.icon.pixmap(QtCore.QSize(64,64)))
                    box.setIconPixmap(pixmap)
                    reply = box.exec_()
                    if reply == 1: # close All
                        for slave in slave_tabs:
                            background(slave.kernel_client.stop_channels)
                            self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                        kernel_manager.shutdown_kernel()
                        self.tab_widget.removeTab(current_tab)
                        background(kernel_client.stop_channels)
                    elif reply == 0: # close Console
                        if not closing_widget._existing:
                            # Have kernel: don't quit, just close the tab
                            closing_widget.execute("exit True")
                        self.tab_widget.removeTab(current_tab)
                        background(kernel_client.stop_channels)
                else:
                    reply = QtGui.QMessageBox.question(self, title,
                        "Are you sure you want to close this Console?"+
                        "\nThe Kernel and other Consoles will remain active.",
                        okay|cancel,
                        defaultButton=okay
                        )
                    if reply == okay:
                        self.tab_widget.removeTab(current_tab)
        elif keepkernel: #close console but leave kernel running (no prompt)
            self.tab_widget.removeTab(current_tab)
            background(kernel_client.stop_channels)
        else: #close console and kernel (no prompt)
            self.tab_widget.removeTab(current_tab)
            if kernel_client and kernel_client.channels_running:
                for slave in slave_tabs:
                    background(slave.kernel_client.stop_channels)
                    self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                if kernel_manager:
                    kernel_manager.shutdown_kernel()
                background(kernel_client.stop_channels)
        
        self.update_tab_bar_visibility()

    def add_tab_with_frontend(self,frontend,name=None):
        """ insert a tab with a given frontend in the tab bar, and give it a name

        """
        if not name:
            name = 'kernel %i' % self.next_kernel_id
        self.tab_widget.addTab(frontend,name)
        self.update_tab_bar_visibility()
        self.make_frontend_visible(frontend)
        frontend.exit_requested.connect(self.close_tab)

    def next_tab(self):
        self.tab_widget.setCurrentIndex((self.tab_widget.currentIndex()+1))

    def prev_tab(self):
        self.tab_widget.setCurrentIndex((self.tab_widget.currentIndex()-1))

    def make_frontend_visible(self,frontend):
        widget_index=self.tab_widget.indexOf(frontend)
        if widget_index > 0 :
            self.tab_widget.setCurrentIndex(widget_index)

    def find_master_tab(self,tab,as_list=False):
        """
        Try to return the frontend that owns the kernel attached to the given widget/tab.

            Only finds frontend owned by the current application. Selection
            based on port of the kernel might be inaccurate if several kernel
            on different ip use same port number.

            This function does the conversion tabNumber/widget if needed.
            Might return None if no master widget (non local kernel)
            Will crash if more than 1 masterWidget

            When asList set to True, always return a list of widget(s) owning
            the kernel. The list might be empty or containing several Widget.
        """

        #convert from/to int/richIpythonWidget if needed
        if isinstance(tab, int):
            tab = self.tab_widget.widget(tab)
        km=tab.kernel_client

        #build list of all widgets
        widget_list = [self.tab_widget.widget(i) for i in range(self.tab_widget.count())]

        # widget that are candidate to be the owner of the kernel does have all the same port of the curent widget
        # And should have a _may_close attribute
        filtered_widget_list = [ widget for widget in widget_list if
                                widget.kernel_client.connection_file == km.connection_file and
                                hasattr(widget,'_may_close') ]
        # the master widget is the one that may close the kernel
        master_widget= [ widget for widget in filtered_widget_list if widget._may_close]
        if as_list:
            return master_widget
        assert(len(master_widget)<=1 )
        if len(master_widget)==0:
            return None

        return master_widget[0]

    def find_slave_widgets(self,tab):
        """return all the frontends that do not own the kernel attached to the given widget/tab.

            Only find frontends owned by the current application. Selection
            based on connection file of the kernel.

            This function does the conversion tabNumber/widget if needed.
        """
        #convert from/to int/richIpythonWidget if needed
        if isinstance(tab, int):
            tab = self.tab_widget.widget(tab)
        km=tab.kernel_client

        #build list of all widgets
        widget_list = [self.tab_widget.widget(i) for i in range(self.tab_widget.count())]

        # widget that are candidate not to be the owner of the kernel does have all the same port of the curent widget
        filtered_widget_list = ( widget for widget in widget_list if
                                widget.kernel_client.connection_file == km.connection_file)
        # Get a list of all widget owning the same kernel and removed it from
        # the previous cadidate. (better using sets ?)
        master_widget_list = self.find_master_tab(tab, as_list=True)
        slave_list = [widget for widget in filtered_widget_list if widget not in master_widget_list]

        return slave_list

    # Populate the menu bar with common actions and shortcuts
    def add_menu_action(self, menu, action, defer_shortcut=False):
        """Add action to menu as well as self
        
        So that when the menu bar is invisible, its actions are still available.
        
        If defer_shortcut is True, set the shortcut context to widget-only,
        where it will avoid conflict with shortcuts already bound to the
        widgets themselves.
        """
        menu.addAction(action)
        self.addAction(action)

        if defer_shortcut:
            action.setShortcutContext(QtCore.Qt.WidgetShortcut)
    
    def init_menu_bar(self):
        #create menu in the order they should appear in the menu bar
        self.init_file_menu()
        self.init_edit_menu()
        self.init_view_menu()
        self.init_kernel_menu()
        self.init_window_menu()
        self.init_help_menu()
    
    def init_file_menu(self):
        self.file_menu = self.menuBar().addMenu("&File")
        
        self.new_kernel_tab_act = QtGui.QAction("New Tab with &New kernel",
            self,
            shortcut="Ctrl+T",
            triggered=self.create_tab_with_new_frontend)
        self.add_menu_action(self.file_menu, self.new_kernel_tab_act)

        self.slave_kernel_tab_act = QtGui.QAction("New Tab with Sa&me kernel",
            self,
            shortcut="Ctrl+Shift+T",
            triggered=self.create_tab_with_current_kernel)
        self.add_menu_action(self.file_menu, self.slave_kernel_tab_act)
        
        self.file_menu.addSeparator()

        self.close_action=QtGui.QAction("&Close Tab",
            self,
            shortcut=QtGui.QKeySequence.Close,
            triggered=self.close_active_frontend
            )
        self.add_menu_action(self.file_menu, self.close_action)

        self.export_action=QtGui.QAction("&Save to HTML/XHTML",
            self,
            shortcut=QtGui.QKeySequence.Save,
            triggered=self.export_action_active_frontend
            )
        self.add_menu_action(self.file_menu, self.export_action, True)

        self.file_menu.addSeparator()
        
        printkey = QtGui.QKeySequence(QtGui.QKeySequence.Print)
        if printkey.matches("Ctrl+P") and sys.platform != 'darwin':
            # Only override the default if there is a collision.
            # Qt ctrl = cmd on OSX, so the match gets a false positive on OSX.
            printkey = "Ctrl+Shift+P"
        self.print_action = QtGui.QAction("&Print",
            self,
            shortcut=printkey,
            triggered=self.print_action_active_frontend)
        self.add_menu_action(self.file_menu, self.print_action, True)
        
        if sys.platform != 'darwin':
            # OSX always has Quit in the Application menu, only add it
            # to the File menu elsewhere.

            self.file_menu.addSeparator()

            self.quit_action = QtGui.QAction("&Quit",
                self,
                shortcut=QtGui.QKeySequence.Quit,
                triggered=self.close,
            )
            self.add_menu_action(self.file_menu, self.quit_action)

    
    def init_edit_menu(self):
        self.edit_menu = self.menuBar().addMenu("&Edit")
        
        self.undo_action = QtGui.QAction("&Undo",
            self,
            shortcut=QtGui.QKeySequence.Undo,
            statusTip="Undo last action if possible",
            triggered=self.undo_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.undo_action)

        self.redo_action = QtGui.QAction("&Redo",
            self,
            shortcut=QtGui.QKeySequence.Redo,
            statusTip="Redo last action if possible",
            triggered=self.redo_active_frontend)
        self.add_menu_action(self.edit_menu, self.redo_action)

        self.edit_menu.addSeparator()

        self.cut_action = QtGui.QAction("&Cut",
            self,
            shortcut=QtGui.QKeySequence.Cut,
            triggered=self.cut_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.cut_action, True)

        self.copy_action = QtGui.QAction("&Copy",
            self,
            shortcut=QtGui.QKeySequence.Copy,
            triggered=self.copy_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.copy_action, True)

        self.copy_raw_action = QtGui.QAction("Copy (&Raw Text)",
            self,
            shortcut="Ctrl+Shift+C",
            triggered=self.copy_raw_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.copy_raw_action, True)

        self.paste_action = QtGui.QAction("&Paste",
            self,
            shortcut=QtGui.QKeySequence.Paste,
            triggered=self.paste_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.paste_action, True)

        self.edit_menu.addSeparator()
        
        selectall = QtGui.QKeySequence(QtGui.QKeySequence.SelectAll)
        if selectall.matches("Ctrl+A") and sys.platform != 'darwin':
            # Only override the default if there is a collision.
            # Qt ctrl = cmd on OSX, so the match gets a false positive on OSX.
            selectall = "Ctrl+Shift+A"
        self.select_all_action = QtGui.QAction("Select &All",
            self,
            shortcut=selectall,
            triggered=self.select_all_active_frontend
            )
        self.add_menu_action(self.edit_menu, self.select_all_action, True)

    
    def init_view_menu(self):
        self.view_menu = self.menuBar().addMenu("&View")

        if sys.platform != 'darwin':
            # disable on OSX, where there is always a menu bar
            self.toggle_menu_bar_act = QtGui.QAction("Toggle &Menu Bar",
                self,
                shortcut="Ctrl+Shift+M",
                statusTip="Toggle visibility of menubar",
                triggered=self.toggle_menu_bar)
            self.add_menu_action(self.view_menu, self.toggle_menu_bar_act)
        
        fs_key = "Ctrl+Meta+F" if sys.platform == 'darwin' else "F11"
        self.full_screen_act = QtGui.QAction("&Full Screen",
            self,
            shortcut=fs_key,
            statusTip="Toggle between Fullscreen and Normal Size",
            triggered=self.toggleFullScreen)
        self.add_menu_action(self.view_menu, self.full_screen_act)

        self.view_menu.addSeparator()

        self.increase_font_size = QtGui.QAction("Zoom &In",
            self,
            shortcut=QtGui.QKeySequence.ZoomIn,
            triggered=self.increase_font_size_active_frontend
            )
        self.add_menu_action(self.view_menu, self.increase_font_size, True)

        self.decrease_font_size = QtGui.QAction("Zoom &Out",
            self,
            shortcut=QtGui.QKeySequence.ZoomOut,
            triggered=self.decrease_font_size_active_frontend
            )
        self.add_menu_action(self.view_menu, self.decrease_font_size, True)

        self.reset_font_size = QtGui.QAction("Zoom &Reset",
            self,
            shortcut="Ctrl+0",
            triggered=self.reset_font_size_active_frontend
            )
        self.add_menu_action(self.view_menu, self.reset_font_size, True)

        self.view_menu.addSeparator()

        self.clear_action = QtGui.QAction("&Clear Screen",
            self,
            shortcut='Ctrl+L',
            statusTip="Clear the console",
            triggered=self.clear_active_frontend)
        self.add_menu_action(self.view_menu, self.clear_action)

        self.pager_menu = self.view_menu.addMenu("&Pager")

        hsplit_action = QtGui.QAction(".. &Horizontal Split",
            self,
            triggered=lambda: self.set_paging_active_frontend('hsplit'))

        vsplit_action = QtGui.QAction(" : &Vertical Split",
            self,
            triggered=lambda: self.set_paging_active_frontend('vsplit'))

        inside_action = QtGui.QAction("   &Inside Pager",
            self,
            triggered=lambda: self.set_paging_active_frontend('inside'))

        self.pager_menu.addAction(hsplit_action)
        self.pager_menu.addAction(vsplit_action)
        self.pager_menu.addAction(inside_action)

    def init_kernel_menu(self):
        self.kernel_menu = self.menuBar().addMenu("&Kernel")
        # Qt on OSX maps Ctrl to Cmd, and Meta to Ctrl
        # keep the signal shortcuts to ctrl, rather than 
        # platform-default like we do elsewhere.

        ctrl = "Meta" if sys.platform == 'darwin' else "Ctrl"

        self.interrupt_kernel_action = QtGui.QAction("&Interrupt current Kernel",
            self,
            triggered=self.interrupt_kernel_active_frontend,
            shortcut=ctrl+"+C",
            )
        self.add_menu_action(self.kernel_menu, self.interrupt_kernel_action)

        self.restart_kernel_action = QtGui.QAction("&Restart current Kernel",
            self,
            triggered=self.restart_kernel_active_frontend,
            shortcut=ctrl+"+.",
            )
        self.add_menu_action(self.kernel_menu, self.restart_kernel_action)

        self.kernel_menu.addSeparator()

        self.confirm_restart_kernel_action = QtGui.QAction("&Confirm kernel restart",
            self,
            checkable=True,
            checked=self.active_frontend.confirm_restart,
            triggered=self.toggle_confirm_restart_active_frontend
            )

        self.add_menu_action(self.kernel_menu, self.confirm_restart_kernel_action)
        self.tab_widget.currentChanged.connect(self.update_restart_checkbox)

    def init_window_menu(self):
        self.window_menu = self.menuBar().addMenu("&Window")
        if sys.platform == 'darwin':
            # add min/maximize actions to OSX, which lacks default bindings.
            self.minimizeAct = QtGui.QAction("Mini&mize",
                self,
                shortcut="Ctrl+m",
                statusTip="Minimize the window/Restore Normal Size",
                triggered=self.toggleMinimized)
            # maximize is called 'Zoom' on OSX for some reason
            self.maximizeAct = QtGui.QAction("&Zoom",
                self,
                shortcut="Ctrl+Shift+M",
                statusTip="Maximize the window/Restore Normal Size",
                triggered=self.toggleMaximized)

            self.add_menu_action(self.window_menu, self.minimizeAct)
            self.add_menu_action(self.window_menu, self.maximizeAct)
            self.window_menu.addSeparator()

        prev_key = "Ctrl+Shift+Left" if sys.platform == 'darwin' else "Ctrl+PgUp"
        self.prev_tab_act = QtGui.QAction("Pre&vious Tab",
            self,
            shortcut=prev_key,
            statusTip="Select previous tab",
            triggered=self.prev_tab)
        self.add_menu_action(self.window_menu, self.prev_tab_act)

        next_key = "Ctrl+Shift+Right" if sys.platform == 'darwin' else "Ctrl+PgDown"
        self.next_tab_act = QtGui.QAction("Ne&xt Tab",
            self,
            shortcut=next_key,
            statusTip="Select next tab",
            triggered=self.next_tab)
        self.add_menu_action(self.window_menu, self.next_tab_act)
    
    def init_help_menu(self):
        # please keep the Help menu in Mac Os even if empty. It will
        # automatically contain a search field to search inside menus and
        # please keep it spelled in English, as long as Qt Doesn't support
        # a QAction.MenuRole like HelpMenuRole otherwise it will lose
        # this search field functionality
        self.help_menu = self.menuBar().addMenu("&Help")

        # Help Menu
        self.help_action = QtGui.QAction("Show &QtConsole help", self,
                                         triggered=self._show_help)
        self.online_help_action = QtGui.QAction("Open online &help", self,
                                                triggered=self._open_online_help)
        self.add_menu_action(self.help_menu, self.help_action)
        self.add_menu_action(self.help_menu, self.online_help_action)

    def _set_active_frontend_focus(self):
        # this is a hack, self.active_frontend._control seems to be 
        # a private member. Unfortunately this is the only method 
        # to set focus reliably
        QtCore.QTimer.singleShot(200, self.active_frontend._control.setFocus)

    # minimize/maximize/fullscreen actions:

    def toggle_menu_bar(self):
        menu_bar = self.menuBar()
        if menu_bar.isVisible():
            menu_bar.setVisible(False)
        else:
            menu_bar.setVisible(True)

    def toggleMinimized(self):
        if not self.isMinimized():
            self.showMinimized()
        else:
            self.showNormal()

    def _show_help(self):
        self.active_frontend._page(gui_reference)

    def _open_online_help(self):
        filename="http://ipython.org/ipython-doc/stable/index.html"
        webbrowser.open(filename, new=1, autoraise=True)

    def toggleMaximized(self):
        if not self.isMaximized():
            self.showMaximized()
        else:
            self.showNormal()

    # Min/Max imizing while in full screen give a bug
    # when going out of full screen, at least on OSX
    def toggleFullScreen(self):
        if not self.isFullScreen():
            self.showFullScreen()
            if sys.platform == 'darwin':
                self.maximizeAct.setEnabled(False)
                self.minimizeAct.setEnabled(False)
        else:
            self.showNormal()
            if sys.platform == 'darwin':
                self.maximizeAct.setEnabled(True)
                self.minimizeAct.setEnabled(True)

    def set_paging_active_frontend(self, paging):
        self.active_frontend._set_paging(paging)

    def close_active_frontend(self):
        self.close_tab(self.active_frontend)

    def restart_kernel_active_frontend(self):
        self.active_frontend.request_restart_kernel()

    def interrupt_kernel_active_frontend(self):
        self.active_frontend.request_interrupt_kernel()

    def toggle_confirm_restart_active_frontend(self):
        widget = self.active_frontend
        widget.confirm_restart = not widget.confirm_restart
        self.confirm_restart_kernel_action.setChecked(widget.confirm_restart)

    def update_restart_checkbox(self):
        if self.active_frontend is None:
            return
        widget = self.active_frontend
        self.confirm_restart_kernel_action.setChecked(widget.confirm_restart)

    def clear_active_frontend(self):
        self.active_frontend.clear()

    def cut_active_frontend(self):
        widget = self.active_frontend
        if widget.can_cut():
            widget.cut()

    def copy_active_frontend(self):
        widget = self.active_frontend
        widget.copy()

    def copy_raw_active_frontend(self):
        self.active_frontend._copy_raw_action.trigger()

    def paste_active_frontend(self):
        widget = self.active_frontend
        if widget.can_paste():
            widget.paste()

    def undo_active_frontend(self):
        self.active_frontend.undo()

    def redo_active_frontend(self):
        self.active_frontend.redo()

    def print_action_active_frontend(self):
        self.active_frontend.print_action.trigger()

    def export_action_active_frontend(self):
        self.active_frontend.export_action.trigger()

    def select_all_active_frontend(self):
        self.active_frontend.select_all_action.trigger()

    def increase_font_size_active_frontend(self):
        self.active_frontend.increase_font_size.trigger()

    def decrease_font_size_active_frontend(self):
        self.active_frontend.decrease_font_size.trigger()

    def reset_font_size_active_frontend(self):
        self.active_frontend.reset_font_size.trigger()

    #---------------------------------------------------------------------------
    # QWidget interface
    #---------------------------------------------------------------------------

    def closeEvent(self, event):
        """ Forward the close event to every tabs contained by the windows
        """
        if self.tab_widget.count() == 0:
            # no tabs, just close
            event.accept()
            return
        # Do Not loop on the widget count as it change while closing
        title = self.window().windowTitle()
        cancel = QtGui.QMessageBox.Cancel
        okay = QtGui.QMessageBox.Ok
        accept_role = QtGui.QMessageBox.AcceptRole
        
        if self.confirm_exit:
            if self.tab_widget.count() > 1:
                msg = "Close all tabs, stop all kernels, and Quit?"
            else:
                msg = "Close console, stop kernel, and Quit?"
            info = "Kernels not started here (e.g. notebooks) will be left alone."
            closeall = QtGui.QPushButton("&Quit", self)
            closeall.setShortcut('Q')
            box = QtGui.QMessageBox(QtGui.QMessageBox.Question,
                                    title, msg)
            box.setInformativeText(info)
            box.addButton(cancel)
            box.addButton(closeall, QtGui.QMessageBox.YesRole)
            box.setDefaultButton(closeall)
            box.setEscapeButton(cancel)
            pixmap = QtGui.QPixmap(self._app.icon.pixmap(QtCore.QSize(64,64)))
            box.setIconPixmap(pixmap)
            reply = box.exec_()
        else:
            reply = okay
        
        if reply == cancel:
            event.ignore()
            return
        if reply == okay or reply == accept_role:
            while self.tab_widget.count() >= 1:
                # prevent further confirmations:
                widget = self.active_frontend
                widget._confirm_exit = False
                self.close_tab(widget)
            event.accept()