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

1. 
   
2. #Use a trace on the StringVar:
   
3. 
   
4. from tkinter import *
   
5. 
   
6. root = Tk()
   
7. 
   
8. s = StringVar(root, '23.1')
   
9. # your image here
   
10. image1 = PhotoImage(width=200, height=200)
    
11. image1.put('blue', to=(0,0,199,199))
    
12. 
    
13. canvas = Canvas(root, width=300, height=300)
    
14. canvas.pack()
    
15. canvas.create_image(150,150, anchor='c', image=image1)
    
16. txt = canvas.create_text(150,150, font='Helvetica 24 bold', text=s.get())
    
17. 
    
18. def on_change(varname, index, mode):
    
19.     canvas.itemconfigure(txt, text=root.getvar(varname))
    
20. 
    
21. s.trace_variable('w', on_change)
    
22. 
    
23. def trigger_change():
    
24.     s.set('26.0')
    
25. 
    
26. root.after(2000, trigger_change)
    
27. root.mainloop()
    

复制代码

1. 
   
2. ##Alternatively, you could just use a Label widget and take advantage of the compound option.
   
3. 
   
4. from tkinter import *
   
5. 
   
6. root = Tk()
   
7. 
   
8. s = StringVar(root, 'fine')
   
9. image1 = PhotoImage(width=200, height=200)
   
10. image1.put('blue', to=(0,0,199,199))
    
11. image2 = PhotoImage(width=200, height=200)
    
12. image2.put('gray70', to=(0,0,199,199))
    
13. 
    
14. lbl = Label(root, compound='center', textvariable=s, image=image1)
    
15. lbl.pack()
    
16. 
    
17. def trigger_change():
    
18.     lbl.config(image=image2)
    
19.     s.set('cloudy')
    
20. 
    
21. root.after(2000, trigger_change)
    
22. root.mainloop()

复制代码

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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