canvas.create_window无法正常工作? [英] canvas.create_window not working?

问题描述

我想在我的画布上放置一个小部件.我编写了以下函数来创建一个按钮并显示它.在画布的x坐标的中心.

I want to place a widget in my canvas. I have written the following function to create a button and display it. in the center of the x coordinate of my canvas.

def Button_Placer():
label1=Label(canvas, width =20, height = 2, font = font2, text="")
label1.pack()
def Show_Name():
    name=NameGenerator()
    label1.config(text=name)
button1=Button(canvas, text="Generate Name", width=20, height=4, font=font1, command=Show_Name)
button1=canvas.create_window(250, 300)

我还在顶部创建了一个画布:

I have also created a canvas at the top:

canvas = Canvas(root, width=500, height = 500, bg="red")
canvas.pack()

很不幸，canvas.create_window无法正常工作..pack()工作不过不是我所需要的.我看了其他示例，但是它们都没有面向对象编程，因此对我的理解并不重要.

Unfortunately the canvas.create_window does not work. .pack() works however is not what i need. I have looked at other examples however they are all off OOP and therefore do not find it relevant for my understanding.

推荐答案

@CommonSense写道，请尝试 canvas.create_window(200，200，window = button1).

As @CommonSense writes, try canvas.create_window(200, 200, window=button1).

也；您在函数内创建 label1 ，当函数退出时，名称 label1 将被垃圾回收.

Also; you create label1 inside a function and when the functioin exits the name label1 will be garbage collected.

在画布上创建小部件时，引用是整数；该小部件在画布上的索引.如果您使用小部件名称作为画布小部件的引用，则会丢失对实际小部件的引用.

When you create widgets on canvas the reference is an integer; the index of that widget on the canvas. If you use the widget name as reference for the canvas widget you lose the reference to the actual widget.

请尝试以下示例:

from tkinter import *

root = Tk()

canvas = Canvas(root, width=500, height=500, bg="red")
canvas.pack()

def Show_Name():
    name = 'A name' # No function NameGenerator()
    label1.config(text=name)

button1 = Button(canvas, text="Generate Name", width=20, height=4,
               command=Show_Name)
canvas_button1 = canvas.create_window(250, 300, window=button1)

label1 = Label(canvas, width=20, height=2, text="")
canvas_label1 = canvas.create_window(250, 200, window=label1)

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