# Source code for taurus.qt.qtgui.panel.qrawdatachooser

    #!/usr/bin/env python

    # ###########################################################################
    #
    # This file is part of Taurus
    #
    # http://taurus-scada.org
    #
    # Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
    #
    # Taurus is free software: you can redistribute it and/or modify
    # it under the terms of the GNU Lesser General Public License as published by
    # the Free Software Foundation, either version 3 of the License, or
    # (at your option) any later version.
    #
    # Taurus is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU Lesser General Public License for more details.
    #
    # You should have received a copy of the GNU Lesser General Public License
    # along with Taurus.  If not, see <http://www.gnu.org/licenses/>.
    #
    # ###########################################################################

    """
    RawDataChooser.py:  widget for importing RawData (from file or from a function)
    """

    import numpy

    from taurus.external.qt import Qt
    from taurus.core.util.safeeval import SafeEvaluator
    from taurus.qt.qtgui.util.ui import UILoadable

    @UILoadable
    class QRawDataWidget(Qt.QWidget):

        ReadFromFiles = Qt.pyqtSignal(int, int)
        AddCurve = Qt.pyqtSignal(dict)

        def __init__(self, parent=None):
            super(QRawDataWidget, self).__init__(parent)
            self.loadUi()

            # connecttions
            self.openFilesBT.clicked.connect(self.onOpenFilesButtonClicked)
            self.addCurveBT.clicked.connect(self.onAddCurveButtonClicked)

            # set validators in LE's
            self.xFromLE.setValidator(Qt.QDoubleValidator(self))
            self.xToLE.setValidator(Qt.QDoubleValidator(self))
            self.xStepLE.setValidator(Qt.QDoubleValidator(self))

        def onOpenFilesButtonClicked(self):
            """Emit a ReadFromFiles signal with the selected xcol and skiprows as
            parameters"""
            xcol = self.xcolSB.value()
            if xcol == self.xcolSB.minimum():
                xcol = None
            skiprows = self.headerSB.value()
            self.ReadFromFiles.emit(xcol, skiprows)

        def onAddCurveButtonClicked(self):
            """Emit a AddCurve signal with a rawdata dictionary as a parameter.
            The rawdata dictionary is prepared from the from the GUI's selection.
            """
            rawdata = {}
            if self.xRangeRB.isChecked():
                rawdata["x"] = numpy.arange(
                    float(self.xFromLE.text()),
                    float(self.xToLE.text()),
                    float(self.xStepLE.text()),
                )
            else:
                sev = SafeEvaluator()
                try:
                    rawdata["x"] = sev.eval(str(self.xValuesLE.text()))
                except Exception:
                    Qt.QMessageBox.warning(
                        self,
                        "Invalid x values",
                        "Cannot interpret the x values."
                        + "\n Use Python expressions like"
                        + '"[1, 3 , 67]" or "arange(100)")',
                    )
                    return
            rawdata["f(x)"] = str(self.f_xLE.text())
            self.AddCurve.emit(rawdata)

    if __name__ == "__main__":
        import sys
        from taurus.qt.qtgui.application import TaurusApplication

        app = TaurusApplication(sys.argv, cmd_line_parser=None)
        form = QRawDataWidget()
        form.show()
        sys.exit(app.exec_())