多选下拉列表增加纵向滚动条

网上看到一个多选下拉列表示范，想给它加一个纵向滚动条，一直没弄成功，请高手指点一下

demo.py文件

1. 
   
2. from tkinter import *
   
3. from ComBoPicker import Combopicker# 导入自定义下拉多选框
   
4. if __name__ == "__main__":
   
5.    
   
6. 
   
7.     root = Tk()
   
8.     root.geometry("200x200")
   
9. 
   
10.     main =Frame(root)
    
11.     main.pack(expand=False, fill="both")
    
12.     COMBOPICKER1 = Combopicker(main, values = ['CELL-S1','CELL-S2','CELL-S3','CELL-S4'])
    
13.     COMBOPICKER1.pack(anchor="w")
    
14. 
    
15.     root.mainloop()
    

复制代码

ComBoPicker.py文件

1. '''
   
2.         自定义多选下拉列表
   
3. '''
   
4. import tkinter.font as tkFont
   
5. import tkinter.ttk as ttk
   
6. from tkinter import *
   
7. class Picker(ttk.Frame):
   
8. 
   
9.     def __init__(self, master=None,activebackground='#b1dcfb',values=[],entry_wid=None,activeforeground='black', selectbackground='#003eff', selectforeground='white', command=None, borderwidth=1, relief="solid"):
   
10. 
    
11.         self._selected_item = None
    
12. 
    
13.         self._values = values
    
14. 
    
15.         self._entry_wid = entry_wid
    
16. 
    
17.         self._sel_bg = selectbackground
    
18.         self._sel_fg = selectforeground
    
19. 
    
20.         self._act_bg = activebackground
    
21.         self._act_fg = activeforeground
    
22. 
    
23.         self._command = command
    
24.         ttk.Frame.__init__(self, master, borderwidth=borderwidth, relief=relief)
    
25. 
    
26.         self.bind("<FocusIn>", lambda event:self.event_generate('<<PickerFocusIn>>'))
    
27.         self.bind("<FocusOut>", lambda event:self.event_generate('<<PickerFocusOut>>'))
    
28. 
    
29.         self._font = tkFont.Font()
    
30. 
    
31.         self.dict_checkbutton = {}
    
32.         self.dict_checkbutton_var = {}
    
33.         self.dict_intvar_item = {}
    
34. 
    
35.         for index,item in enumerate(self._values):
    
36. 
    
37.             self.dict_intvar_item[item] = IntVar()
    
38.             self.dict_checkbutton[item] = ttk.Checkbutton(self, text = item, variable=self.dict_intvar_item[item],command=lambda ITEM = item:self._command(ITEM))
    
39.             self.dict_checkbutton[item].grid(row=index, column=0, sticky=NSEW)
    
40.             self.dict_intvar_item[item].set(0)
    
41. 
    
42. 
    
43. class Combopicker(ttk.Entry, Picker):
    
44.     def __init__(self, master, values= [] ,entryvar=None, entrywidth=None, entrystyle=None, **elect=None,activebackground='#b1dcfb', activeforeground='black', selectbackground='#003eff', selectforeground='white', borderwidth=1, relief="solid"):
    
45. 
    
46.         if entryvar is not None:
    
47.             self.entry_var = entryvar
    
48.         else:
    
49.             self.entry_var = StringVar()
    
50. 
    
51.         entry_config = {}
    
52.         if entrywidth is not None:
    
53.             entry_config["width"] = entrywidth
    
54. 
    
55.         if entrystyle is not None:
    
56.             entry_config["style"] = entrystyle
    
57. 
    
58.         ttk.Entry.__init__(self, master, textvariable=self.entry_var, **entry_config, state = "readonly")
    
59. 
    
60.         self._is_menuopti**_visible = False
    
61. 
    
62.         self.picker_frame = Picker(self.winfo_toplevel(), values=values,entry_wid = self.entry_var,activebackground=activebackground, activeforeground=activeforeground, selectbackground=selectbackground, selectforeground=selectforeground, command=self._on_selected_check)
    
63. 
    
64.         self.bind_all("<1>", self._on_click, "+")
    
65. 
    
66.         self.bind("<Escape>", lambda event: self.hide_picker())
    
67. 
    
68.     @property
    
69.     def current_value(self):
    
70.         try:
    
71.             value = self.entry_var.get()
    
72.             return value
    
73.         except ValueError:
    
74.             return None
    
75. 
    
76.     @current_value.setter
    
77.     def current_value(self, INDEX):
    
78.         self.entry_var.set(values.index(INDEX))
    
79. 
    
80.     def _on_selected_check(self, SELECTED):
    
81. 
    
82.         value = []
    
83.         if self.entry_var.get() != "" and self.entry_var.get() != None:
    
84.             temp_value = self.entry_var.get()
    
85.             value = temp_value.split(",")
    
86. 
    
87.         if str(SELECTED) in value:
    
88.             value.remove(str(SELECTED))
    
89. 
    
90.         else:   
    
91.             value.append(str(SELECTED))
    
92. 
    
93.         value.sort()
    
94. 
    
95.         temp_value = ""
    
96.         for index,item in enumerate(value):
    
97.             if item!= "":
    
98.                 if index != 0:
    
99.                     temp_value += ","
    
100.                 temp_value += str(item)
     
101. 
     
102.         self.entry_var.set(temp_value)
     
103. 
     
104.     def _on_click(self, event):
     
105.         str_widget = str(event.widget)
     
106. 
     
107.         if str_widget == str(self):
     
108.             if not self._is_menuopti**_visible:
     
109.                 self.show_picker()
     
110.         else:
     
111.             if not str_widget.startswith(str(self.picker_frame)) and self._is_menuopti**_visible:
     
112.                 self.hide_picker()
     
113. 
     
114.     def show_picker(self):
     
115.         if not self._is_menuopti**_visible:
     
116.             self.picker_frame.place(in_=self, relx=0, rely=1, relwidth=1 )
     
117.             self.picker_frame.lift()
     
118. 
     
119.         self._is_menuopti**_visible = True
     
120. 
     
121.     def hide_picker(self):
     
122.         if self._is_menuopti**_visible:
     
123.             self.picker_frame.place_forget()
     
124. 
     
125.         self._is_menuopti**_visible = False
     
126. 
     

复制代码

有人知道吗？请指点一下呢