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# Useful widgets
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from pyqtgraph.Qt import QtCore, QtGui, QtWidgets
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# Useful class for adding horizontal lines.
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class QHLine(QtGui.QFrame):
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def __init__(self):
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super(QHLine, self).__init__()
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self.setFrameShape(QtGui.QFrame.HLine)
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self.setFrameShadow(QtGui.QFrame.Sunken)
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