我在畫布中創建了一個框架，通過單擊鼠標在其中放置復選按鈕。選擇另一個單選按鈕，我運行命令 canvas.delete("all") 來清除畫布（以及帶有復選按鈕的框架），然后再次創建框架以繼續放置復選按鈕?？蚣芤褎摻ǎ覠o法再放置檢查按鈕（我也沒有收到錯誤消息）。有人知道為什么嗎？from tkinter import *root = Tk()top_canvas = Canvas(root,width=676,height=768, bg='light blue')top_canvas.pack()frame = Frame(top_canvas, bg='light grey')main_frame = top_canvas.create_window(500, 780, height = 1600, width = 600, window = frame)def place_checkbutton_in_canvas(e): # order to insert the checkbutton xx = e.x yy = e.y buttons = Checkbutton(frame) buttons.place(x=xx, y=yy)def place_checkbutton(): #to run when checkbutton is selected. Now the checkbutton will be placed where mouse clicked if choose_line is selected frame.bind('<Button-1>', place_checkbutton_in_canvas)def clear_canvas(): top_canvas.delete("all") frame = Frame(top_canvas, bg='magenta') main_frame = top_canvas.create_window(500, 780, height=1600, width=600, window=frame)chosen_option = IntVar()choose_checkbutton = Radiobutton(root, text = "place checkbutton", variable=chosen_option, value = 1, command = place_checkbutton)choose_checkbutton.place(x=10, y=10)clear_button = Radiobutton(root, text = "clear everything", variable=chosen_option, value = 2, command = clear_canvas)clear_button.place(x=10, y=100)root.mainloop()
1 回答
慕婉清6462132
TA貢獻1804條經驗 獲得超2個贊
無需刪除畫布上的所有項目。您可以使用列表來保存所有檢查按鈕，并使用.destroy()“刪除”它們：
from tkinter import *
root = Tk()
top_canvas = Canvas(root,width=676,height=768, bg='light blue')
top_canvas.pack()
root.checkbutton_list = [] # initial a list
frame = Frame(top_canvas, bg='light grey')
main_frame = top_canvas.create_window(500, 780, height = 1600, width = 600, window = frame)
def place_checkbutton_in_canvas(e): # order to insert the checkbutton
xx = e.x
yy = e.y
buttons = Checkbutton(frame)
buttons.place(x=xx, y=yy)
root.checkbutton_list.append(buttons) # append the checkbutton to the list
def place_checkbutton(): #to run when checkbutton is selected. Now the checkbutton will be placed where mouse clicked if choose_line is selected
frame.bind('<Button-1>', place_checkbutton_in_canvas)
def clear_canvas():
for i in root.checkbutton_list:
i.destroy() # destroy all the checkbuttons in the list
root.checkbutton_list = [] # init it again
chosen_option = IntVar()
choose_checkbutton = Radiobutton(root, text = "place checkbutton", variable=chosen_option, value = 1, command = place_checkbutton)
choose_checkbutton.place(x=10, y=10)
clear_button = Radiobutton(root, text = "clear everything", variable=chosen_option, value = 2, command = clear_canvas)
clear_button.place(x=10, y=100)
root.mainloop()
如果你真的想將它與 一起使用.delete(ALL)。你需要更改 checkbutton 的父容器。我用它root.frame來覆蓋前一幀。例如：
from tkinter import *
root = Tk()
top_canvas = Canvas(root,width=676,height=768, bg='light blue')
top_canvas.pack()
root.frame = Frame(top_canvas, bg='light grey')
main_frame = top_canvas.create_window(500, 780, height = 1600, width = 600, window = root.frame)
def place_checkbutton_in_canvas(e): # order to insert the checkbutton
xx = e.x
yy = e.y
buttons = Checkbutton(root.frame)
buttons.place(x=xx, y=yy)
def place_checkbutton(): #to run when checkbutton is selected. Now the checkbutton will be placed where mouse clicked if choose_line is selected
root.frame.bind('<Button-1>', place_checkbutton_in_canvas)
def clear_canvas():
top_canvas.delete("all")
root.frame = Frame(top_canvas, bg='magenta')
main_frame = top_canvas.create_window(500, 780, height=1600, width=600, window=root.frame)
chosen_option = IntVar()
choose_checkbutton = Radiobutton(root, text = "place checkbutton", variable=chosen_option, value = 1, command = place_checkbutton)
choose_checkbutton.place(x=10, y=10)
clear_button = Radiobutton(root, text = "clear everything", variable=chosen_option, value = 2, command = clear_canvas)
clear_button.place(x=10, y=100)
root.mainloop()
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