Hi
Quick answer - No
The value is set at either 100 or <initval> in the .xml file if set.
By the time the pins are available, the panel has been created from the .xml file
Long answer - Anything is possible, if you want to do it.
Have a look at /usr/share/pyshared/pyvcp_widgets.py
The code for the spinbox widget starts at line 763
You could rewrite the widget so that it creates a param called initparam and updates when this changes.
Code:
class pyvcp_spinbox(Spinbox):
""" (control) controls a float, also shown as text
reacts to the mouse wheel
<spinbox>
[ <halpin>"my-spinbox"</halpin> ]
[ <min_>55</min_> ] sets the minimum value to 55
[ <max_>123</max_> ] sets the maximum value to 123
[ <initval>100</initval> ] sets intial value to 100 TJP 12 04 2007
</spinbox>
"""
# FIXME: scale resolution when shift/ctrl/alt is held down?
n=0
def __init__(self,master,pycomp,halpin=None, halparam=None,
min_=0,max_=100,initval=0,resolution=1,format="2.1f",**kw):
self.v = DoubleVar()
if 'increment' not in kw: kw['increment'] = resolution
if 'from' not in kw: kw['from'] = min_
if 'to' not in kw: kw['to'] = max_
if 'format' not in kw: kw['format'] = "%" + format
kw['command'] = self.command
Spinbox.__init__(self,master,textvariable=self.v,**kw)
if halpin == None:
halpin = "spinbox."+str(pyvcp_spinbox.n)
pyvcp_spinbox.n += 1
self.halpin=halpin
if halparam == None:
halparam = "spinbox.initparam"
self.halparam=halparam
if initval < min_:
self.value=min_
elif initval > max_:
self.value=max_
else:
self.value=initval
self.oldvalue=min_
self.init=self.value
self.oldinit=self.init
self.format = "%(b)"+format
self.max_=max_
self.min_=min_
self.resolution=resolution
self.v.set( str( self.format % {'b':self.value} ) )
pycomp.newpin(halpin, HAL_FLOAT, HAL_OUT)
pycomp.newpin(halparam, HAL_FLOAT, HAL_IN)
self.bind('<Button-4>',self.wheel_up)
self.bind('<Button-5>',self.wheel_down)
pycomp[self.halparam] = self.init
def command(self):
self.value = self.v.get()
def update(self,pycomp):
pycomp[self.halpin] = self.value
if self.value != self.oldvalue:
self.v.set( str( self.format % {'b':self.value} ) )
self.oldvalue=self.value
self.init = pycomp[self.halparam]
if self.init != self.oldinit:
self.v.set( str( self.format % {'b':self.init} ) )
self.oldinit=self.init
self.value=self.init
def wheel_up(self,event):
self.value += self.resolution
if self.value > self.max_:
self.value = self.max_
def wheel_down(self,event):
self.value -= self.resolution
if self.value < self.min_:
self.value = self.min_
# -------------------------------------------
And here it is working - ignore the other stuff, I just added it to a sim to test it
Attachment not found
This is not polished, I am not a python programmer, but it works.
(you need to delete /usr/lib/python2.6/dist-packages/pyvcp_widgets.pyc and insert this code into pyvcp_widgets.py or it will run the old compiled code)
regards
