def SetPV(self, pv=None):
"set pv, either an epics.PV object or a pvname"
if isinstance(pv, epics.PV):
self.pv = pv
elif isinstance(pv, (str, unicode)):
self.pv = epics.PV(pv)
if self.pv is None:
return
self.pv.connection_callbacks.append(self.OnEpicsConnect)
self.pv.get()
self.pv.get_ctrlvars()
# be sure to set precision before value!! or PV may be moved!!
prec = self.pv.precision
if prec is None:
prec = 0
self.SetPrecision(prec)
self.SetValue(self.pv.char_value, act=False)
if self.pv.type in ('string', 'char'):
self._warn('pvFloatCtrl needs a double or float PV')
llim = set_float(self.pv.lower_ctrl_limit)
hlim = set_float(self.pv.upper_ctrl_limit)
if hlim is not None and llim is not None and hlim > llim:
self.SetMax(hlim)
self.SetMin(llim)
self.pv.add_callback(self._FloatpvEvent, wid=self.GetId())
self.SetAction(self._onEnter)
def SetPV(self, pv=None):
"set pv, either an epics.PV object or a pvname"
if isinstance(pv, epics.PV):
self.pv = pv
elif isinstance(pv, (str, unicode)):
self.pv = epics.get_pv(pv)
if self.pv is None:
return
self.pv.connection_callbacks.append(self.OnEpicsConnect)
self.pv.get()
self.pv.get_ctrlvars()
# be sure to set precision before value!! or PV may be moved!!
prec = self.pv.precision
if prec is None:
prec = 0
self.SetPrecision(prec)
self.SetValue(self.pv.char_value, act=False)
if self.pv.type in ('string', 'char'):
try:
x = float(self.pv.value)
except:
self._warn('pvFloatCtrl needs a double or float PV')
llim = set_float(self.pv.lower_ctrl_limit)
hlim = set_float(self.pv.upper_ctrl_limit)
if hlim is not None and llim is not None and hlim > llim:
self.SetMax(hlim)
self.SetMin(llim)
ncback = len(self.pv.callbacks) + 1
self.pv.add_callback(self._pvEvent, wid=self.GetId(), cb_info=ncback)
self.SetAction(self._onEnter)
def _pvEvent(self, pvname=None, value=None, wid=None,
char_value=None, **kws):
"epics PV callback function"
if pvname is None or value is None or wid is None:
return
if char_value is None and value is not None:
prec = kws.get('precision', None)
if prec not in (None, 0):
char_value = ("%%.%if" % prec) % value
else:
char_value = set_float(value)
self.OnPVChange(char_value)
def _pvEvent(self, pvname=None, value=None, wid=None,
char_value=None, **kws):
"epics PV callback function"
if pvname is None or value is None or wid is None:
return
if char_value is None and value is not None:
prec = kws.get('precision', None)
if prec not in (None, 0):
char_value = ("%%.%if" % prec) % value
else:
char_value = set_float(value)
self.OnPVChange(char_value)
def _FloatpvEvent(self, pvname=None, value=None, wid=None,
char_value=None, **kw):
"PV callback / event handler for pv change"
if pvname is None or value is None or wid is None:
return
if char_value is None and value is not None:
prec = kw.get('precision', None)
if prec not in (None, 0):
char_value = ("%%.%if" % prec) % value
else:
char_value = set_float(value)
self.SetValue(char_value, act=False)
def _FloatpvEvent(self, pvname=None, value=None, wid=None,
char_value=None, **kw):
"PV callback / event handler for pv change"
if pvname is None or value is None or wid is None:
return
if char_value is None and value is not None:
prec = kw.get('precision', None)
if prec not in (None, 0):
char_value = ("%%.%if" % prec) % value
else:
char_value = set_float(value)
self.SetValue(char_value, act=False)
