tkinter实现过程中发现create_text竟然没有textvariable

豌图酱

tkinter实现过程中发现create_text竟然没有textvariable功能，求助那如果我要在画布上显示可变的文本时要怎么办呢？？

豌图酱

有搜到一个网页：python - How to add a Tkinter Text Variable in canvas text
http://stackoverflow.com/questio ... able-in-canvas-text


但是打不开啊，估计被墙了

SixPy

豌图酱 发表于 2017-5-12 10:14
有搜到一个网页：python - How to add a Tkinter Text Variable in canvas text
http://stackoverflow.co ...

我这能打开阿

SixPy

#Use a trace on the StringVar:

from tkinter import *

root = Tk()

s = StringVar(root, '23.1')
# your image here
image1 = PhotoImage(width=200, height=200)
image1.put('blue', to=(0,0,199,199))

canvas = Canvas(root, width=300, height=300)
canvas.pack()
canvas.create_image(150,150, anchor='c', image=image1)
txt = canvas.create_text(150,150, font='Helvetica 24 bold', text=s.get())

def on_change(varname, index, mode):
    canvas.itemconfigure(txt, text=root.getvar(varname))

s.trace_variable('w', on_change)

def trigger_change():
    s.set('26.0')

root.after(2000, trigger_change)
root.mainloop()

##Alternatively, you could just use a Label widget and take advantage of the compound option.

from tkinter import *

root = Tk()

s = StringVar(root, 'fine')
image1 = PhotoImage(width=200, height=200)
image1.put('blue', to=(0,0,199,199))
image2 = PhotoImage(width=200, height=200)
image2.put('gray70', to=(0,0,199,199))

lbl = Label(root, compound='center', textvariable=s, image=image1)
lbl.pack()

def trigger_change():
    lbl.config(image=image2)
    s.set('cloudy')

root.after(2000, trigger_change)
root.mainloop()

豌图酱

SixPy 发表于 2017-5-12 12:00

那个trace_variable是什么意思，内置函数嘛~

豌图酱

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