如何在Tkinter中按字符设置文本动画？

Daijoubu 发表于 Dev

大上部

所以我知道在python窗口中您可以使用此..

for char in introstring:
    sleep(0.2)
    sys.stdout.write(char)
    sys.stdout.flush()

它将以0.2的速度逐个字符显示在窗口中的文本

如何将其转换为Tkinter窗口？例如，我有以下文字：

canvas.create_text((720,454),text="Just in case you start to feel sniffily, or something",fill="white", font=('arial'))

有没有办法获得相同的动画，但是在Tkinter GUI中，我已经设置好了？我已经听说过有关.after命令的信息，但是我似乎找不到如何将其应用于此功能。

2号环

这是一个非常简单的示例，将一个字符一个字符地打印到画布上，每个字符之间的延迟为500毫秒。

import Tkinter as tk

root = tk.Tk()
canvas = tk.Canvas(root)
canvas.pack()

canvas_text = canvas.create_text(10, 10, text='', anchor=tk.NW)

test_string = "This is a test"
#Time delay between chars, in milliseconds
delta = 500 
delay = 0
for i in range(len(test_string) + 1):
    s = test_string[:i]
    update_text = lambda s=s: canvas.itemconfigure(canvas_text, text=s)
    canvas.after(delay, update_text)
    delay += delta

root.mainloop()

该代码已在Python 2.6上进行了测试。要在Python 3上运行它，您需要将import语句更改为import tkinter as tk

这是一个更复杂的示例，显示输入到Entry小部件中的文本。Enter在“条目”小部件中按时会显示文本。

#!/usr/bin/env python

''' animate text in a tkinter canvas 

    See http://stackoverflow.com/q/34973060/4014959
    Written by PM 2Ring 2016.01.24
'''

import Tkinter as tk

class Application(object):
    def __init__(self):
        root = tk.Tk()
        self.canvas = tk.Canvas(root)
        self.canvas.pack()
        self.canvas_text = self.canvas.create_text(10, 10, text='', anchor=tk.NW)

        self.entry = tk.Entry(root)
        self.entry.bind("<Return>", self.entry_cb)
        self.entry.pack()
        root.mainloop()

    def animate_text(self, text, delta):
        ''' Animate canvas text with a time delay given in milliseconds '''
        delay = 0
        for i in range(len(text) + 1):
            update_text = lambda s=text[:i]: self.canvas.itemconfigure(self.canvas_text, text=s)
            self.canvas.after(delay, update_text)
            delay += delta

    def entry_cb(self, event):
        self.animate_text(self.entry.get(), 250) 

app = Application()