source: bcdaqwidgets/trunk/src/bcdaqwidgets_demos/pyside_probe.py @ 1443

#!/usr/bin/env python

'''
PySide implementation of EPICS probe

:author: Matt Newville, CARS, University of Chicago
:note: Does not use bcdaqwidgets
'''

import epics
import os
import sys
from PySide.QtGui import QWidget, QLabel, QLineEdit, QGridLayout, QApplication

class PVProbe(QWidget):
    '''frame that monitors a user-entered EPICS PV'''
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        name_label  = QLabel("PV Name:")
        self.pvname = QLineEdit()
        value_label = QLabel("PV Value:")
        self.value  = QLabel(" "*4)

        self.pvname.returnPressed.connect(self.onPVNameReturn)
        self.pv = None

        grid = QGridLayout()
        grid.addWidget(name_label,   0, 0)
        grid.addWidget(self.pvname,  0, 1)
        grid.addWidget(value_label,  1, 0)
        grid.addWidget(self.value,   1, 1)

        self.setLayout(grid)
        self.setWindowTitle("PySide PV Probe:")

    def onPVNameReturn(self):
        '''responds when user enters a new PV'''
        if self.pv is not None:
            self.pv.remove_callback()
            self.pv.ca_disconnect()
        self.pv = epics.PV(self.pvname.text(), callback=self.onPVChange)

    def onPVChange(self, pvname=None, char_value=None, **kws):
        '''updates the widget (not thread-safe)'''
        self.value.setText(char_value)


def main():
    app = QApplication(sys.argv)
    probe = PVProbe()
    probe.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()


########### SVN repository information ###################
# $Date: 2013-10-16 01:22:10 +0000 (Wed, 16 Oct 2013) $
# $Author: jemian $
# $Revision: 1443 $
# $URL: bcdaqwidgets/trunk/src/bcdaqwidgets_demos/pyside_probe.py $
# $Id: pyside_probe.py 1443 2013-10-16 01:22:10Z jemian $
########### SVN repository information ###################