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pyepics_Qt.py
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pyepics_Qt.py
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import epics
from PyQt5.QtWidgets import QWidget, QLabel, QLineEdit, QComboBox, QMessageBox, QPushButton
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtGui import QDoubleValidator,QIntValidator
from epics.utils import BYTES2STR
class PVText(QLabel):
pvChanging=pyqtSignal(str,float)
def __init__(self, pvname, parent=None):
QLabel.__init__(self,'',parent)
self.pv = None
self.cb_index = None
if pvname is not None:
self.setPV(pvname)
def setPV(self, pvname,prec=5,type=float):
self.prec=prec
self.type=type
if self.pv is not None and self.cb_index is not None:
self.pvChanging.disconnect()
self.pv.remove_callback(self.cb_index)
self.pv = epics.PV(BYTES2STR(pvname))
self.setText(self.pv.get(as_string=True))
self.cb_index = self.pv.add_callback(self.onPVChange)
self.pvChanging.connect(self.updatePV)
def onPVChange(self, pvname=None, value=None, char_value=None, **kws):
self.pvChanging.emit(char_value,value)
def updatePV(self,char_value,value):
if self.type==float:
self.setText(('%.'+str(self.prec)+'f')%value)
elif self.type==int:
self.setText('%d'%value)
else:
self.setText(char_value)
class PVLineEdit(QLineEdit):
pvChanged=pyqtSignal(str)
def __init__(self, pvname=None, parent=None):
QLineEdit.__init__(self, parent)
self.returnPressed.connect(self.onReturn)
self.pv = None
self.cb_index = None
if pvname is not None:
self.setPV(pvname)
def setPV(self, pvname, type=float, prec=5):
if self.pv is not None and self.cb_index is not None:
self.pv.remove_callback(self.cb_index)
self.pvChanged.disconnect(self.updatePV)
self.prec=prec
self.type=type
self.pv = epics.PV(BYTES2STR(pvname))
self.cb_index = self.pv.add_callback(self.onPVChange)
self.pvChanged.connect(self.updatePV)
if self.type==float:
self.validator=QDoubleValidator()
self.setValidator(self.validator)
elif self.type==int:
self.validator=QIntValidator()
self.setValidator(self.validator)
#self.updatePV(self.pv.char_value)
def onPVChange(self, pvname=None, char_value=None, **kws):
self.pvChanged.emit(char_value)
def updatePV(self,char_value):
if self.type==float:
text=float(char_value)
self.setText(("{:."+str(self.prec)+"f}").format(text))
else:
self.setText(char_value)
def onReturn(self):
if (self.type==float or self.type==int):
if self.validator.validate(self.text(),0)[0]==self.validator.Acceptable:
self.pv.put(BYTES2STR(self.text()))
else:
QMessageBox.warning(self,'Value Error','Please input floating point numbers only',QMessageBox.Ok)
else:
self.pv.put(BYTES2STR(self.text()))
class PVComboBox(QComboBox):
def __init__(self,parent=None,pvname=None):
QComboBox.__init__(self,parent)
self.pv = None
if pvname is not None:
self.setPV(pvname)
def setPV(self,pvname):
if self.pv is not None:
self.currentIndexChanged.disconnect()
self.pv=epics.PV(BYTES2STR(pvname))
self.clear()
self.addItems(self.pv.enum_strs)
self.setCurrentIndex(self.pv.value)
self.currentIndexChanged.connect(self.stateChanged)
def stateChanged(self,index):
text=self.itemText(index)
self.pv.put(BYTES2STR(text))
self.setCurrentIndex(index)
# class PVPushButton(QPushButton):
# def __init__(self,parent=None,pvname=None):
# QPushButton.__init__(self,parent)
# self.pv = None
# self.buttonText=None
# if pvname is not None:
# self.setPV(pvname)
#
# def setPV(self,pvname):
# self.pv=epics.PV(BYTES2STR(pvname))
# self.clicked.connect(self.changePV)
# self.cb_index = self.pv.add_callback(self.onPVChange)
# #self.pvChanged.connect(self.updatePushButton)
#
#
# def changePV(self):
# if self.pv.value==1:
# self.pv.put(0)
# else:
# self.pv.put(1)
def onPVChange(self,pvname=None, value=None, **kws):
print(value)
if self.pv.value==1:
self.setText(self.buttonText)
else:
self.setText('Stop')