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98
Gdk.cairo_set_source_rgba(gdkcontext, Gdk.RGBA(0, 0, 0, 0.50))
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gdkcontext.set_line_width(3.0)
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gdkcontext.line_to(pos_x+size/2, pos_y+size)
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def on_expose(self, widget, cr): # pylint: disable-msg=W0613
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"""Callback: redraws the widget when it is exposed"""