2 回答

TA貢獻1784條經驗 獲得超8個贊
有一個現有的 AutocompleteEntry 小部件。
例子:
from ttkwidgets.autocomplete import AutocompleteEntry
import tkinter as tk
window = tk.Tk()
Label1 = tk.Label(window, text="Entry:")
Label1.pack(side='left', padx=10, pady=10)
test_values = ['one', 'two', 'three']
test_var = tk.StringVar(window)
test_var.set('Default Value')
Entry1 = AutocompleteEntry(window, width=20, textvariable=test_var, completevalues=test_values)
Entry1.pack(side='left', padx=10, pady=10)
window.mainloop()

TA貢獻1863條經驗 獲得超2個贊
好的,在分析了這段代碼幾個小時后,我想出了如何使用該insert()方法將值設為默認值。這樣做后我的第一個問題是列表框在應用程序啟動時默認也是活動的。通過向changed函數添加另一個 if 條件,它不會打開列表框,直到值被清除。當我添加條件語句時,該行在self.lb.destroy()清除字段時會引發錯誤:
AttributeError:“AutocompleteEntry”對象沒有屬性“lb”
我不確定為什么會拋出這個錯誤,因為它在我添加條件之前就起作用了。但是,lb未在類或函數的其他任何地方定義。刪除該行修復了錯誤,一切似乎都按預期工作。這是我所做的更改。如果其他人有更好的解決方案,請告訴我。
class AutocompleteEntry(Entry):
# add settings argument which is True or False
def __init__(self, lista, settings, *args, **kwargs):
Entry.__init__(self, *args, **kwargs)
self.lista = lista
# define the self.settings object
self.settings = settings
self.var = self["textvariable"]
if self.var == '':
self.var = self["textvariable"] = StringVar()
self.var.trace('w', self.changed)
self.bind("<Return>", 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() - removed this line
self.lb_up = False
# change this variable to False once the field is cleared
self.settings = False
# add if condition - field is not empty and settings is True
elif self.var.get() != '' and self.settings == True:
self.lb_up = False
else:
words = self.comparison()
if words:
if not self.lb_up:
self.lb = Listbox()
self.lb.bind("<Double-Button-1>", self.selection)
self.lb.bind("<Return>", 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
最后一部分:
if __name__ == '__main__':
root = Tk()
# define settings variable and add to AutoCompleteEntry arguments
settings = True
entry = AutocompleteEntry(lista, settings, root)
entry.insert(END, "this is the default value")
entry.grid(row=0, column=0)
Button(text='nothing').grid(row=1, column=0)
Button(text='nothing').grid(row=2, column=0)
Button(text='nothing').grid(row=3, column=0)
root.mainloop()
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