Tkinter - 如何使用自動填充功能創建組合框

Question

是否可以創建一個組合框，並在列表中使用最近的項目進行更新？

例如：

A = ttk.Combobox() 
A['values'] = ['Chris', 'Jane', 'Ben', 'Megan'] 

然後鍵入「CHR」進入組合框，我希望它在「克里斯」自動填寫。

Answer 1

tkinter wiki包含code自動完成文本框，但既然您想要一個組合框，您可以使用this代碼（您正在尋找AutocompleteCombobox）。

---

""" 
tkentrycomplete.py 

A Tkinter widget that features autocompletion. 

Created by Mitja Martini on 2008-11-29. 
Updated by Russell Adams, 2011/01/24 to support Python 3 and Combobox. 
Updated by Dominic Kexel to use Tkinter and ttk instead of tkinter and tkinter.ttk 
    Licensed same as original (not specified?), or public domain, whichever is less restrictive. 
""" 
import sys 
import os 
import Tkinter 
import ttk 

__version__ = "1.1" 

# I may have broken the unicode... 
Tkinter_umlauts=['odiaeresis', 'adiaeresis', 'udiaeresis', 'Odiaeresis', 'Adiaeresis', 'Udiaeresis', 'ssharp'] 

class AutocompleteEntry(Tkinter.Entry): 
     """ 
     Subclass of Tkinter.Entry that features autocompletion. 

     To enable autocompletion use set_completion_list(list) to define 
     a list of possible strings to hit. 
     To cycle through hits use down and up arrow keys. 
     """ 
     def set_completion_list(self, completion_list): 
       self._completion_list = sorted(completion_list, key=str.lower) # Work with a sorted list 
       self._hits = [] 
       self._hit_index = 0 
       self.position = 0 
       self.bind('<KeyRelease>', self.handle_keyrelease) 

     def autocomplete(self, delta=0): 
       """autocomplete the Entry, delta may be 0/1/-1 to cycle through possible hits""" 
       if delta: # need to delete selection otherwise we would fix the current position 
         self.delete(self.position, Tkinter.END) 
       else: # set position to end so selection starts where textentry ended 
         self.position = len(self.get()) 
       # collect hits 
       _hits = [] 
       for element in self._completion_list: 
         if element.lower().startswith(self.get().lower()): # Match case-insensitively 
           _hits.append(element) 
       # if we have a new hit list, keep this in mind 
       if _hits != self._hits: 
         self._hit_index = 0 
         self._hits=_hits 
       # only allow cycling if we are in a known hit list 
       if _hits == self._hits and self._hits: 
         self._hit_index = (self._hit_index + delta) % len(self._hits) 
       # now finally perform the auto completion 
       if self._hits: 
         self.delete(0,Tkinter.END) 
         self.insert(0,self._hits[self._hit_index]) 
         self.select_range(self.position,Tkinter.END) 

     def handle_keyrelease(self, event): 
       """event handler for the keyrelease event on this widget""" 
       if event.keysym == "BackSpace": 
         self.delete(self.index(Tkinter.INSERT), Tkinter.END) 
         self.position = self.index(Tkinter.END) 
       if event.keysym == "Left": 
         if self.position < self.index(Tkinter.END): # delete the selection 
           self.delete(self.position, Tkinter.END) 
         else: 
           self.position = self.position-1 # delete one character 
           self.delete(self.position, Tkinter.END) 
       if event.keysym == "Right": 
         self.position = self.index(Tkinter.END) # go to end (no selection) 
       if event.keysym == "Down": 
         self.autocomplete(1) # cycle to next hit 
       if event.keysym == "Up": 
         self.autocomplete(-1) # cycle to previous hit 
       if len(event.keysym) == 1 or event.keysym in Tkinter_umlauts: 
         self.autocomplete() 

class AutocompleteCombobox(ttk.Combobox): 

     def set_completion_list(self, completion_list): 
       """Use our completion list as our drop down selection menu, arrows move through menu.""" 
       self._completion_list = sorted(completion_list, key=str.lower) # Work with a sorted list 
       self._hits = [] 
       self._hit_index = 0 
       self.position = 0 
       self.bind('<KeyRelease>', self.handle_keyrelease) 
       self['values'] = self._completion_list # Setup our popup menu 

     def autocomplete(self, delta=0): 
       """autocomplete the Combobox, delta may be 0/1/-1 to cycle through possible hits""" 
       if delta: # need to delete selection otherwise we would fix the current position 
         self.delete(self.position, Tkinter.END) 
       else: # set position to end so selection starts where textentry ended 
         self.position = len(self.get()) 
       # collect hits 
       _hits = [] 
       for element in self._completion_list: 
         if element.lower().startswith(self.get().lower()): # Match case insensitively 
           _hits.append(element) 
       # if we have a new hit list, keep this in mind 
       if _hits != self._hits: 
         self._hit_index = 0 
         self._hits=_hits 
       # only allow cycling if we are in a known hit list 
       if _hits == self._hits and self._hits: 
         self._hit_index = (self._hit_index + delta) % len(self._hits) 
       # now finally perform the auto completion 
       if self._hits: 
         self.delete(0,Tkinter.END) 
         self.insert(0,self._hits[self._hit_index]) 
         self.select_range(self.position,Tkinter.END) 

     def handle_keyrelease(self, event): 
       """event handler for the keyrelease event on this widget""" 
       if event.keysym == "BackSpace": 
         self.delete(self.index(Tkinter.INSERT), Tkinter.END) 
         self.position = self.index(Tkinter.END) 
       if event.keysym == "Left": 
         if self.position < self.index(Tkinter.END): # delete the selection 
           self.delete(self.position, Tkinter.END) 
         else: 
           self.position = self.position-1 # delete one character 
           self.delete(self.position, Tkinter.END) 
       if event.keysym == "Right": 
         self.position = self.index(Tkinter.END) # go to end (no selection) 
       if len(event.keysym) == 1: 
         self.autocomplete() 
       # No need for up/down, we'll jump to the popup 
       # list at the position of the autocompletion 

def test(test_list): 
     """Run a mini application to test the AutocompleteEntry Widget.""" 
     root = Tkinter.Tk(className=' AutocompleteEntry demo') 
     entry = AutocompleteEntry(root) 
     entry.set_completion_list(test_list) 
     entry.pack() 
     entry.focus_set() 
     combo = AutocompleteCombobox(root) 
     combo.set_completion_list(test_list) 
     combo.pack() 
     combo.focus_set() 
     # I used a tiling WM with no controls, added a shortcut to quit 
     root.bind('<Control-Q>', lambda event=None: root.destroy()) 
     root.bind('<Control-q>', lambda event=None: root.destroy()) 
     root.mainloop() 

if __name__ == '__main__': 
     test_list = ('apple', 'banana', 'CranBerry', 'dogwood', 'alpha', 'Acorn', 'Anise') 
     test(test_list) 

Answer 2

的AutoCompleteComboBox是一個真正的美女的確，上面的回答涉及到從Python代碼給定的值的列表獲取。我正在加強答案，包括從SQLite提取的數據並顯示到組合框中：

if __name__ == '__main__': 
     #test_list = ('apple', 'banana', 'CranBerry', 'dogwood', 'alpha', 'Acorn', 'Anise', 'crannotberry') 
     #test(test_list) 

     connection = sqlite3.connect('my_sqliteDB') 
     cur = connection.cursor() 
     cur.execute("select stock_item_name from inventory") 
     sqloutput = cur.fetchall() #This contains the SQL output in format [(u'data1',), (u'data2',), (u'data3',)] 
     sqloutput_2 = [item[0] for item in sqloutput] #This is manipulated to the format [u'data1',u'data2',u'data3'] 
     test_list = tuple(map(str, sqloutput_2)) #This will remove the unicode data and final format [data1,data2,data3] 
     test(test_list) #The final format works with values in DB.