sg_后台线程运行函数示例

import PySimpleGUI as sg
import math
import time
from threading import Eventdef calculate_sqrt_sum(window, stop_event):"""后台计算函数：计算1亿以内自然数的平方根之和"""total = 100_000_000batch_size = 1_000_000sum_result = 0.0start_time = time.time()try:for i in range(1, total + 1):sum_result += math.sqrt(i)# 进度更新if i % batch_size == 0 or i == total:progress = i / total * 100elapsed = time.time() - start_time# 发送进度更新事件（使用元组传递多个值）window.write_event_value('-PROGRESS-', (f'已处理 {i:,} 个数...',progress,sum_result,elapsed))# 检查停止信号if stop_event.is_set():window.write_event_value('-CANCELED-', None)return# 计算完成elapsed = time.time() - start_timewindow.write_event_value('-DONE-', (sum_result, elapsed))except Exception as e:window.write_event_value('-ERROR-', str(e))def main():stop_event = Event()layout = [[sg.Text('1亿以内自然数平方根之和计算器')],[sg.Text('计算进度:'), sg.ProgressBar(100, orientation='h', size=(30, 20), key='-PROGRESS-BAR-')],[sg.Multiline('', size=(50, 8), key='-OUTPUT-', autoscroll=True)],[sg.Text('结果:'), sg.Input('', key='-RESULT-', disabled=True, size=(30, 1))],[sg.Text('用时:'), sg.Input('', key='-TIME-', disabled=True, size=(15, 1)), sg.Text('秒')],[sg.Button('开始计算'), sg.Button('停止'), sg.Button('退出')]]window = sg.Window('后台计算示例', layout, finalize=True)window['-PROGRESS-BAR-'].update(0)while True:event, values = window.read()if event in (sg.WIN_CLOSED, '退出'):stop_event.set()breakelif event == '开始计算':window['-PROGRESS-BAR-'].update(0)window['-RESULT-'].update('')window['-TIME-'].update('')window['-OUTPUT-'].update('')stop_event.clear()window['开始计算'].update(disabled=True)window['停止'].update(disabled=False)# 启动后台线程window.start_thread(lambda: calculate_sqrt_sum(window, stop_event),'-THREAD-')elif event == '停止':stop_event.set()window['停止'].update(disabled=True)# 处理来自线程的事件elif event == '-PROGRESS-':message, progress, result, elapsed = values[event]window['-OUTPUT-'].print(message)window['-PROGRESS-BAR-'].update(progress)elif event == '-DONE-':result, elapsed = values[event]window['-RESULT-'].update(f'{result:.4f}')window['-TIME-'].update(f'{elapsed:.2f}')window['-OUTPUT-'].print('计算完成!')window['开始计算'].update(disabled=False)window['停止'].update(disabled=True)elif event == '-CANCELED-':window['-OUTPUT-'].print('计算已取消')window['开始计算'].update(disabled=False)window['停止'].update(disabled=True)elif event == '-ERROR-':sg.popup_error(f'计算出错: {values[event]}')window['开始计算'].update(disabled=False)window['停止'].update(disabled=True)window.close()if __name__ == '__main__':main()