def __init__(self, parent=None):
super().__init__(parent)
self.setFocusPolicy(Qt.StrongFocus)
self.setAcceptDrops(True)
self._currentTool = BaseTool()
self._currentToolActivated = False
self._eventFilter = KeyEventFilter(self)
font = self.window().font_()
self._layoutManager = LayoutManager(font, self)
self._mouseDown = False
self._preview = False
self._defaultDrawingAttributes["showGlyphSelection"] = True
# inbound notifications
app = QApplication.instance()
app.dispatcher.addObserver(self, "_needsUpdate", "glyphViewUpdate")
app.dispatcher.addObserver(self, "_preferencesChanged",
"preferencesChanged")
self.readSettings()
