class ThreadedClient:
gate = None
scales = None
dispensingControl = None
dispensingRule = None
tickCounter = 0
"""
Launch the main part of the GUI and the worker thread. periodicCall and
endApplication could reside in the GUI part, but putting them here
means that you have all the thread controls in a single place.
"""
def __init__(self, master):
"""
Start the GUI and the asynchronous threads. We are in the main
(original) thread of the application, which will later be used by
the GUI. We spawn a new thread for the worker.
"""
self.master = master
self.running = 1
self.dispensing_state = 0
# Create the queue
self.queue = queue.Queue()
# Set up the GUI part
self.gui = GuiPart(master, self.queue, self.onEndApplication,
self.onGUIEvent)
self.gate = Gate(self.processOpeningChange)
self.gate.start()
self.gate.execute(["Z"])
self.scales = Scales()
self.scales.subscribe("WeightChanged", self)
self.scales.start()
self.scales.execute("T")
self.scales.execute("Z")
self.dispensingControl = DispensingControl(self.scales, self.gate)
self.dispensingControl.subscribe("FlowChanged", self)
self.loadDispensingRule()
# Start the periodic call in the GUI to check if the queue contains
# anything
self.periodicCall()
def processOpeningChange(self, sender, openingData):
self.gui.update(["OpeningPercentage", openingData[0]])
self.gui.update(["OpeningSteps", openingData[1]])
def onWeightChanged(self, weightAndState):
weight = weightAndState[0]
stable = weightAndState[1]
self.gui.update(["ActualWeight", weight])
if self.dispensing_state == 1:
opening = self.dispensingRule.getOpeningForWeight(weight)
if opening < 0:
self.btn_stopdispensing_click()
else:
self.gate.execute(["P", opening])
def onFlowChanged(self, flow):
self.gui.update(["ActualFlow", flow])
def periodicCall(self):
"""
Check every 100 ms if there is something new in the queue.
"""
self.gui.processIncoming()
if not self.running:
# This is the brutal stop of the system. You may want to do
# some cleanup before actually shutting it down.
import sys
sys.exit(1)
self.master.after(100, self.periodicCall)
def onEndApplication(self):
self.gate.execute(["C"])
self.gate.execute("X")
self.scales.execute("X")
print("before join")
self.gate.join()
self.scales.join()
print("ready")
self.running = 0
def onGUIEvent(self, event):
if isinstance(event.widget, Button):
btn_text = event.widget.cget("text")
if btn_text == "Down":
self.btn_down_click()
elif btn_text == "Up":
self.btn_up_click()
elif btn_text == "TickDn":
self.btn_tickdown_click()
elif btn_text == "TickUp":
self.btn_tickup_click()
elif btn_text == "Zero":
self.btn_zero_click()
elif btn_text == "Open":
self.btn_open_click()
elif btn_text == "Close":
self.btn_close_click()
elif btn_text == "StartDispensing":
self.btn_startdispensing_click()
elif btn_text == "StopDispensing":
self.btn_stopdispensing_click()
elif btn_text == "LoadDispRule":
self.btn_loaddispensingrule_click()
else:
print("widgetType = ", typeof(event.widget), ", x= ", event.x,
", y = ", event.y, ", num = ", event.num)
def btn_down_click(self):
self.gate.execute(["S", 10])
def btn_up_click(self):
self.gate.execute(["S", -10])
def btn_tickdown_click(self):
self.gate.execute(["S", 1])
def btn_tickup_click(self):
self.gate.execute(["S", -1])
def btn_zero_click(self):
self.gate.execute(["Z"])
def btn_open_click(self):
self.gate.execute(["O"])
def btn_close_click(self):
self.gate.execute(["C"])
def btn_startdispensing_click(self):
self.dispensing_state = 1
self.scales.execute(["T"])
self.gate.execute(["O"])
self.gui.update(["DispensingState", self.dispensing_state])
# self.periodicWeight()
def btn_stopdispensing_click(self):
self.dispensing_state = 0
self.gate.execute(["C"])
self.gui.update(["DispensingState", self.dispensing_state])
def btn_loaddispensingrule_click(self):
self.loadDispensingRule()
def loadDispensingRule(self):
if self.dispensingRule is None:
self.dispensingRule = DispensingRule()
self.dispensingRule.load()
self.gui.update(["DispensingRule", self.dispensingRule.asString()])
