爲什麼屬性不會在用戶輸入的traitsui中更新

Question

我有一個簡單的程序，可以從用戶那裏獲取文本輸入，並將其顯示在儀器上（吉時利）。但是，該屬性似乎沒有改變。也就是說，當我運行Start方法時，即使在彈出窗口中更改了Display，輸出也是「Wowee」。我必須使它可編輯嗎？我不這麼認爲。我基本上是遵循Gael Varoquaux's介紹性狀。

COntrolPanel.py：

from traits.api import * 
from traitsui.api import * 

import Keithley3706A_module 



class ControlPanel(HasTraits): 
    keithley2430settings = Instance(Keithley2430.Keithley2430Settings,()) 
    keithley3706Asettings = Instance(Keithley3706A_module.Keithley3706ASettings,()) 
    start = Button("Start Measurements") 
    clear_3706A_display = Button("Clear K3706A Display") 

    k3706A_settings = Keithley3706A_module.Keithley3706ASettings() 
    k3706A = Keithley3706A_module.Keithley3706A() 
    view = View(Item('start', show_label=False,style='custom'), 
     Item('clear_3706A_display', show_label=False,style='custom'), 
     Item('keithley2430settings',style='custom'), 
     Item('keithley3706Asettings',style='simple')) 


    def _start_fired(self): 
     print "hello %s" % self.k3706A_settings.display 
     self.k3706A.message(self.k3706A_settings.display) 

    def _clear_3706A_display_fired(self): 
     self.k3706A.clear() 

if __name__ == '__main__': 
    ControlPanel().configure_traits() 

Keithley3706A.py：

from traits.api import * 
from traitsui.api import * 

import visa 
import time 

class Keithley3706ASettings(HasTraits): 
    display = String("Wowee") 

class Keithley3706A(HasTraits): 
    def __init__(self): 
     self.Keithley3706AUSB = visa.instrument("USB0::0x05E6::0x3706::04019447::INSTR") 

    def message(self,foo): 
     s="display.settext('%s')" % foo 
     self.Keithley3706AUSB.write("display.clear()") 
     self.Keithley3706AUSB.write(s) 

    def clear(self): 
     self.Keithley3706AUSB.write("display.clear()") 

Answer 1

在ControlPanel類，創建了兩個的Keithley3706ASettings，即keithley3706Asettings和k3706A_settings不同的實例。如果我刪除後者，並將k3706A_settings替換爲keithley3706Asettings，則可以使用。這裏是我的版本（與被去除的2430設備的引用，該k3706A特質聲明的Keithley3706A的Instance，以及其他一些不相關的用戶界面的變化）：

class ControlPanel(HasTraits): 

    keithley3706Asettings = Instance(Keithley3706A_module.Keithley3706ASettings,()) 

    k3706A = Instance(Keithley3706A_module.Keithley3706A,()) 

    start = Button("Start Measurements") 
    clear_3706A_display = Button("Clear K3706A Display") 

    view = View(UItem('start'), 
       UItem('clear_3706A_display'), 
       Item('keithley3706Asettings', style='simple')) 

    def _start_fired(self): 
     print "hello %s" % self.keithley3706Asettings.display 
     self.k3706A.message(self.keithley3706Asettings.display) 

    def _clear_3706A_display_fired(self): 
     self.k3706A.clear()