the quickest solution I can come up with is to use a handler script that monitors the spinbutton in the custom gladevcp panel and saves the current value to a file if it changes. On opening the gui the script will set the spinbutton value to the value read from that file:
to try save this as 'gladevcp-handler.py' to the 'python' folder in your config:
Code:
#!/usr/bin/env python3
import hal
import os
parameter_file = 'gladepanel_parameter.txt'
class HandlerClass:
def on_value_changed(self,hal_spinbutton1,data=None):
changed_value = hal_spinbutton1.get_value()
print(':gladevcp-handler: gladevcp.hal_spinbutton1 value has changed to ', changed_value)
f = open(parameter_file, 'w')
f.write(str(changed_value))
f.close()
def __init__(self, halcomp,builder,useropts):
self.halcomp = halcomp
self.hal_spinbutton1 = builder.get_object("hal_spinbutton1") # builder.get_object(ID of the targeted glade object)
self.halcomp.newpin("number", hal.HAL_FLOAT, hal.HAL_IN)
print(':gladevcp-handler: Initialized')
print(':gladevcp-handler: gladevcp.hal_spinbutton1 value is ', self.hal_spinbutton1.get_value())
if os.path.isfile(parameter_file):
with open(parameter_file) as f:
line = f.readline()
line_parsed = list(line.strip().split('\t'))
value = float(line_parsed[0])
print(':gladevcp-handler: Setting gladevcp.hal_spinbutton1 value to ', value)
self.hal_spinbutton1.set_value(value)
def get_handlers(halcomp,builder,useropts):
return [HandlerClass(halcomp,builder,useropts)]
then change this line in the [DISPLAY] section of your ini file from:
Code:
EMBED_TAB_COMMAND = halcmd loadusr -Wn testpanel gladevcp -c testpanel -H ./gladevcp/testpanel.hal -x {XID} ./gladevcp/testpanel.ui
to this (this will automatically load the handler file when the custom panel is loaded):
Code:
EMBED_TAB_COMMAND= halcmd loadusr -Wn testpanel gladevcp -c testpanel -u python/gladevcp-handler.py -H ./gladevcp/testpanel.hal -x {XID} ./gladevcp/testpanel.ui
To get this to work with the 'testpanel.ui' I posted earlier you need to open the panel in glade and
1. make sure the 'ID' of the spinbutton to be monitored is 'hal_spinbutton1'
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2. add the handler to the spinbutton by opening the 'Signals' tab and writing 'on_value_changed' in the 'Handler' column of the 'value-changed' line. With this a value change in the spinbutton widget will call the on_value_changed function in the handler script.
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