Tkinter自動完成：如何將選定的值傳遞給另一個類

Question

我有一個簡單的GUI，帶有一個組合框和一個列表框，它依賴於組合框。該列表框具有自動完成功能。現在我想將組合框的選擇以及列表框的選擇傳遞給一個函數。這裏是我到目前爲止的代碼：

from Tkinter import * 
import ttk, os, re 
root = Tk() 
root.minsize(500,300) 
root.maxsize(550,310) 

def go(Arg1, Arg2): 
    print "works" + Arg1 + Arg2 


class AutocompleteEntry(Entry): 
    def __init__(self, lista, *args, **kwargs): 
     Entry.__init__(self, *args, **kwargs) 
     self.lista = lista 
     self.var = self["textvariable"] 
     if self.var == '': 
      self.var = self["textvariable"] = StringVar() 
     self.var.trace('w', self.changed) 
     self.bind("<Right>", self.selection) 
     self.bind("<Up>", self.up) 
     self.bind("<Down>", self.down) 
     self.lb_up = False 


    def changed(self, name, index, mode): 
     if self.var.get() == '': 
      self.lb.destroy() 
      self.lb_up = False 
     else: 
      words = self.comparison() 
      print words 
      if words: 
       if not self.lb_up: 
        self.lb = Listbox() 
        self.lb.bind("<Double-Button-1>", self.selection) 
        self.lb.bind("<Right>", self.selection) 
        self.lb.place(x=self.winfo_x(), y=self.winfo_y()+self.winfo_height()) 
        self.lb_up = True 

       self.lb.delete(0, END) 
       for w in words: 
        self.lb.insert(END,w) 
      else: 
       if self.lb_up: 
        self.lb.destroy() 
        self.lb_up = False 

    def selection(self, event): 
     if self.lb_up: 
      self.var.set(self.lb.get(ACTIVE)) 
      self.list_out = self.lb.get(ACTIVE) 

      self.lb.destroy() 
      self.lb_up = False 
      self.icursor(END) 
     return self.list_out 

    def up(self, event): 
     if self.lb_up: 
      if self.lb.curselection() ==(): 
       index = '0' 
      else: 
       index = self.lb.curselection()[0] 
      if index != '0': 
       self.lb.selection_clear(first=index) 
       index = str(int(index)-1) 
       self.lb.selection_set(first=index) 
       self.lb.activate(index) 

    def down(self, event): 
     if self.lb_up: 
      if self.lb.curselection() ==(): 
       index = '0' 
      else: 
       index = self.lb.curselection()[0] 
      if index != END: 
       self.lb.selection_clear(first=index) 
       index = str(int(index)+1) 
       self.lb.selection_set(first=index) 
       self.lb.activate(index) 

    def comparison(self): 
     pattern = re.compile(self.var.get() + '.*') 
     return [w for w in self.lista if re.match(pattern, w)] 




class MyListbox: 

    lista = ['a', 'actions', 'additional', 'also', 'an', 'and', 'angle', 'are', 'as', 'be', 'bind', 'bracket', 'brackets', 'button', 'can', 'cases', 'configure', 'course', 'detail', 'enter', 'event', 'events', 'example', 'field', 'fields', 'for', 'give', 'important', 'in', 'information', 'is', 'it', 'just', 'key', 'keyboard', 'kind', 'leave', 'left', 'like', 'manager', 'many', 'match', 'modifier', 'most', 'of', 'or', 'others', 'out', 'part', 'simplify', 'space', 'specifier', 'specifies', 'string;', 'that', 'the', 'there', 'to', 'type', 'unless', 'use', 'used', 'user', 'various', 'ways', 'we', 'window', 'wish', 'you'] 


    def __init__(self, parent, title): 
     self.parent = parent 
     self.parent.title(title) 
     self.parent.protocol("WM_DELETE_WINDOW", self.closes) 
     self.cities = ['New York', 'Vienna', 'Miami', 'Oslo'] 

     self.establishment() 

    def combobox_handler(self, event): 
     current = self.combobox.current() 
     print self.combobox.get() 
     self.combo_out = self.combobox.get() 
     self.entNumber.delete(0, END) 

     print self.lista 
     self.entNumber.delete(0, END) 
     self.entNumber = AutocompleteEntry(self.lista, self.parent) 
     self.entNumber.place(x=50, y=100) 
     return self.combo_out 



    def establishment(self): 
     mainFrame = Frame(self.parent) 
     mainFrame.pack(fill=BOTH, expand=YES) 

     fr_left = Frame(mainFrame, bd=10) 
     fr_left.pack(fill=BOTH, expand=YES, side=LEFT) 

     self.combobox = ttk.Combobox(fr_left, values=self.cities) 
     self.combobox.bind('<<ComboboxSelected>>', self.combobox_handler) 
     self.combobox.pack() 

     fr_right = Frame(mainFrame, bd=10) 
     fr_right.pack(fill=BOTH, expand=YES, side=RIGHT) 

     fr_up = Frame(fr_right) 
     fr_up.pack(side=TOP, expand=YES) 


     self.entNumber = Entry() 
     self.entNumber.place(x=50, y=100) 
     labb=Button(fr_left,text="OK",command= lambda: go(self.combo_out, AutocompleteEntry.list_out), bg="green") 
     labb.pack(side=BOTTOM, fill=X, pady=5) 


    def closes(self, event=None): 
     self.parent.destroy() 

if __name__ == '__main__': 
    app = MyListbox(root, "Main Window") 
    root.mainloop() 

要通過組合框的變量是沒有問題的，但通過列表框的變量是棘手的我，因爲它來自不同的類。這裏是一部分，在列表框的選擇發生，我想通過list_out：

def selection(self, event): 
    if self.lb_up: 
     self.var.set(self.lb.get(ACTIVE)) 
     self.list_out = self.lb.get(ACTIVE) 

     self.lb.destroy() 
     self.lb_up = False 
     self.icursor(END) 
    return self.list_out 

代碼工作，複製到你的系統的時候。

Answer 1

首先，請勿使用lambda。 lambda在真正需要時非常有用，但在這種情況下並非如此。它所做的只是增加了代碼的複雜性。一個好的經驗法則是永遠不要使用lambda，除非沒有別的選擇。

其次，讓按鈕調用是類的一部分的函數。你需要的數據已經可以訪問，所以根本就不需要傳遞它。

類MyListbox： ... 高清去（個體經營）： 打印 「作品」 + self.combo_out，self.entNumber.list_out ... 高清機構（個體經營）： ... labb = Button（fr_left，text =「OK」，command = self.go）