def __init__(self, dm, parent=None):
"""
desc:
Constructor to initialize a QDataMatrix object.
arguments:
dm:
type: `DataMatrix`
keywords:
parent:
desc: A parent QWidget, or None for no parent.
type: [QWidget, None]
"""
QtWidgets.QWidget.__init__(self, parent=parent)
self._dm = dm
self._spreadsheet = QSpreadSheet(self)
self._layout = QtWidgets.QHBoxLayout(self)
self._layout.addWidget(self._spreadsheet)
self._layout.setContentsMargins(0, 0, 0, 0)
self.refresh()
