1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#!/usr/bin/env python
import epics
import sys
try:
from PySide.QtGui import QWidget, QLabel, QLineEdit, QGridLayout, QApplication
except:
from PyQt4.QtGui import QWidget, QLabel, QLineEdit, QGridLayout, QApplication
from epics.utils import bytes2str
class PVText(QLabel):
def __init__(self, pvname, **kws):
QLabel.__init__(self, '', **kws)
self.pv = None
self.cb_index = None
def SetPV(self, pvname):
if self.pv is not None and self.cb_index is not None:
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)
def onPVChange(self, pvname=None, char_value=None, **kws):
self.setText(char_value)
class PVLineEdit(QLineEdit):
def __init__(self, pvname=None, **kws):
QLineEdit.__init__(self, **kws)
self.returnPressed.connect(self.onReturn)
self.pv = None
self.cb_index = None
if pvname is not None:
self.SetPV(pvname)
def SetPV(self, pvname):
if self.pv is not None and self.cb_index is not None:
self.pv.remove_callback(self.cb_index)
self.pv = epics.PV(bytes2str(pvname))
self.cb_index = self.pv.add_callback(self.onPVChange)
def onPVChange(self, pvname=None, char_value=None, **kws):
self.setText(char_value)
def onReturn(self):
self.pv.put(bytes2str(self.text()))
class PVProbe(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.setWindowTitle("PyQt4 PV Probe:")
self.pv1name = QLineEdit()
self.pv2name = QLineEdit()
self.value = PVText(None)
self.pvedit = PVLineEdit()
grid = QGridLayout()
grid.addWidget(QLabel("PV1 Name (Read-only):"), 0, 0)
grid.addWidget(QLabel("PV1 Value (Read-only):"), 1, 0)
grid.addWidget(QLabel("PV2 Name: (Read-write):"), 2, 0)
grid.addWidget(QLabel("PV2 Value (Read-write):"), 3, 0)
grid.addWidget(self.pv1name, 0, 1)
grid.addWidget(self.value, 1, 1)
grid.addWidget(self.pv2name, 2, 1)
grid.addWidget(self.pvedit, 3, 1)
self.pv1name.returnPressed.connect(self.onPV1NameReturn)
self.pv2name.returnPressed.connect(self.onPV2NameReturn)
self.setLayout(grid)
def onPV1NameReturn(self):
self.value.SetPV(self.pv1name.text())
def onPV2NameReturn(self):
self.pvedit.SetPV(self.pv2name.text())
if __name__ == '__main__':
app = QApplication(sys.argv)
probe = PVProbe()
probe.show()
sys.exit(app.exec_())
|
