Use object registry for mainwindow.

qutebrowser/app.py

@@ -135,8 +135,8 @@ class Application(QApplication):
         log.init.debug("Initializing downloads...")
         self.downloadmanager = downloads.DownloadManager(self)
         log.init.debug("Initializing main window...")
-        self.mainwindow = mainwindow.MainWindow()
-        modeman_obj.mainwindow = self.mainwindow
+        mainwin = mainwindow.MainWindow()
+        self.registry['mainwindow'] = mainwin
         log.init.debug("Initializing debug console...")
         self._debugconsole = console.ConsoleWidget()
         log.init.debug("Initializing eventfilter...")
@@ -149,7 +149,7 @@ class Application(QApplication):
 
         log.init.debug("Showing mainwindow...")
         if not args.nowindow:
-            self.mainwindow.show()
+            mainwin.show()
         log.init.debug("Applying python hacks...")
         self._python_hacks()
         QTimer.singleShot(0, self._process_init_args)
@@ -371,7 +371,8 @@ class Application(QApplication):
         # pylint: disable=too-many-statements
         # syntactic sugar
         kp = self._keyparsers
-        status = self.mainwindow.status
+        mainwin = self.registry['mainwindow']
+        status = mainwin.status
         completion = self.registry['completion']
         tabs = self.registry['tabbedbrowser']
         cmd = self.registry['status-cmd']
@@ -419,7 +420,7 @@ class Application(QApplication):
 
         # config
         self.config.style_changed.connect(style.get_stylesheet.cache_clear)
-        for obj in (tabs, completion, self.mainwindow, self.cmd_history,
+        for obj in (tabs, completion, mainwin, self.cmd_history,
                     websettings, modeman, status, status.txt):
             self.config.changed.connect(obj.on_config_changed)
         for obj in kp.values():
@@ -527,7 +528,7 @@ class Application(QApplication):
     def _save_geometry(self):
         """Save the window geometry to the state config."""
         stateconfig = self.registry['stateconfig']
-        data = bytes(self.mainwindow.saveGeometry())
+        data = bytes(self.registry['mainwindow'].saveGeometry())
         geom = base64.b64encode(data).decode('ASCII')
         try:
             stateconfig.add_section('geometry')

qutebrowser/keyinput/modeman.py

@@ -70,7 +70,6 @@ class ModeManager(QObject):
 
     Attributes:
         passthrough: A list of modes in which to pass through events.
-        mainwindow: The mainwindow object
         locked: Whether current mode is locked. This means the current mode can
                 still be left (then locked will be reset), but no new mode can
                 be entered while the current mode is active.
@@ -94,7 +93,6 @@ class ModeManager(QObject):
 
     def __init__(self, parent=None):
         super().__init__(parent)
-        self.mainwindow = None
         self.locked = False
         self._handlers = {}
         self.passthrough = []
@@ -284,7 +282,8 @@ class ModeManager(QObject):
             # We already handled this same event at some point earlier, so
             # we're not interested in it anymore.
             return False
-        if QApplication.instance().activeWindow() is not self.mainwindow:
+        if (QApplication.instance().activeWindow() is not
+                utils.get_object('mainwindow')):
             # Some other window (print dialog, etc.) is focused so we pass
             # the event through.
             return False

qutebrowser/widgets/tabwidget.py

@@ -28,11 +28,10 @@ import functools
 
 from PyQt5.QtCore import pyqtSlot, Qt, QSize, QRect, QPoint, QTimer
 from PyQt5.QtWidgets import (QTabWidget, QTabBar, QSizePolicy, QCommonStyle,
-                             QStyle, QStylePainter, QStyleOptionTab,
-                             QApplication)
+                             QStyle, QStylePainter, QStyleOptionTab)
 from PyQt5.QtGui import QIcon, QPalette, QColor
 
-from qutebrowser.utils import qtutils
+from qutebrowser.utils import qtutils, utils
 from qutebrowser.config import config
 
 
@@ -210,7 +209,7 @@ class TabBar(QTabBar):
             confwidth = str(config.get('tabs', 'width'))
             if confwidth.endswith('%'):
                 perc = int(confwidth.rstrip('%'))
-                width = QApplication.instance().mainwindow.width() * perc / 100
+                width = utils.get_object('mainwindow').width() * perc / 100
             else:
                 width = int(confwidth)
             size = QSize(max(minimum_size.width(), width), height)