Question

我正在使用Python tkinter进行设计。在我的UI中，我有一个画布，分隔符和滚动条。在更新时，新的画布正在附加到前一个。你能告诉我如何删除以前的画布，分隔符＆amp;滚动条？

我试过select dt.vendor, dt.email, dt.address, c.country, m.material, c.country from country c inner join vendor_countries vc on (c.id = vc.cid) right join details dt on (dt.id = vc.did) left join vendor_materials vm on dt.id = vm.did left join material m on vm.mid = m.id，separator.destroy()， canvas.delete('all')，self.canvas.delete('all')等
CODE：
```
self.canvas.update_idletasks()
```

Answer 1

为了清除框架的内容，我们的想法是摧毁它的所有孩子。框架的所有子项都存储在dictionnary frame.children中（在{name：widget}下面）

children = list(frame.children.values())
for child in children:
    child.destroy()

您可以使用它来清除分隔符2,3和2的内容。 6 get()开头。 separator2仅在get()内部定义，与其他框架的定义不一致，这意味着每次运行separator2时都会创建新的get()。所以我把它移到了函数之外，还有其他框架。

以下是修改后的代码：

from tkinter import *
import matplotlib
import pandas as pd
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.pyplot as plt
from wordcloud import WordCloud
from matplotlib.figure import Figure

master = Tk()
separator3 = Frame(master, height=618,width=180, bd=4, bg='dodgerblue')
separator6 = Frame(master, height=250,width=240, bd=4, bg='dodgerblue')
separator1 = Frame(master, height=100,width=100, bd=1,bg='dodgerblue')
separator2 = Frame(master, height=150, width=280, bd=4, bg='dodgerblue')  # define separator2 outside get()

def get():
    # start by clearing frames
    children = list(separator6.children.values()) + list(separator3.children.values()) + list(separator2.children.values())
    for child in children:
      child.destroy()

    Disp_pos =10
    Disp_neg =-12
    w = Scale(separator6, from_=10, to=0,orient=VERTICAL)
    w.set(Disp_pos)
    w.pack(anchor=CENTER,side=TOP,ipady=10,ipadx=10)

    Label1 = Label(separator6, text="")
    Label1.pack(anchor=CENTER, side=TOP)
    f3 = Figure(figsize=(2, 3), dpi=100)
    canvas2 = FigureCanvasTkAgg(f3, master=separator3)
    Label1 = Label(separator3,text="  WORD  CLOUD ")
    Label1.pack(anchor=CENTER, side=TOP)
    ax3 = f3.add_subplot(111)
    text = 'sample'
    print(type(text))
    ax3.set_wordcloud = WordCloud().generate(text)
    ax3.imshow(ax3.set_wordcloud, interpolation='bilinear')
    ax3.axis("off")
    canvas2.show() 
    canvas2.get_tk_widget().pack( side=BOTTOM,fill=BOTH, expand=1)
    canvas2.draw()
    scrollbar = Scrollbar(separator2)
    scrollbar.pack(side=RIGHT, ipady=270, fill=Y)
    Label1 = Label(separator2, text=" TEXT ",font=('Times', 12))
    Label1.pack(anchor=CENTER, side=TOP)
    i = 'sample sample sample'
    Re=Listbox(separator2,yscrollcommand=scrollbar.set)                      
    Re.insert(END, i)
    Re.pack()
    scrollbar.config(command=Re.yview)

Button1 = Button(separator1, text='  GET  ', font=('Times', 
                15,'bold'),command=get,  bg="wheat2",relief=RAISED)

Button1.pack(anchor=CENTER,pady=5)
separator1.pack(fill=BOTH,side=LEFT, padx=5, pady=5)
separator6.pack(fill=BOTH,side=RIGHT, padx=5, pady=5)
separator3.pack(side=BOTTOM,fill=BOTH,padx=5, pady=5)
separator2.pack(side=TOP, padx=10, pady=10, fill=BOTH)
master.config(bg='white')
master.title('sample')
mainloop()

如何删除画布，分隔符和滚动条？

1 个答案: