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GitHub Repository: jackfrued/Python-100-Days
 Path: blob/master/Day01-15/code/Day13/singlethread2.py
Views: 729
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"""

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不使用多线程的情况 - 耗时间的任务阻塞主事件循环

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Version: 0.1

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Author: 骆昊

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Date: 2018-03-20

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"""

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import time

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import tkinter

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import tkinter.messagebox

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def download():

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    # 模拟下载任务需要花费10秒钟时间

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    time.sleep(10)

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    tkinter.messagebox.showinfo('提示', '下载完成!')

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def show_about():

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    tkinter.messagebox.showinfo('关于', '作者: 骆昊(v1.0)')

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def main():

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    top = tkinter.Tk()

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    top.title('单线程')

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    top.geometry('200x150')

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    top.wm_attributes('-topmost', True)

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    panel = tkinter.Frame(top)

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    button1 = tkinter.Button(panel, text='下载', command=download)

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    button1.pack(side='left')

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    button2 = tkinter.Button(panel, text='关于', command=show_about)

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    button2.pack(side='right')

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    panel.pack(side='bottom')

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    tkinter.mainloop()

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if __name__ == '__main__':

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    main()

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# 在不使用多线程的情况下 一旦点击下载按钮 由于该操作需要花费10秒中的时间

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# 整个主消息循环也会被阻塞10秒钟无法响应其他的事件

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# 事实上 对于没有因果关系的子任务 这种顺序执行的方式并不合理

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