PyQt5线程休眠和唤醒

本是古典何须时尚 2022-03-01 11:10 446阅读 0赞

在上一篇文章中我有写线程的终止 挂起和唤醒，下面这个例子是线程的休眠和唤醒，是通过线程内一个私有的属性来进行的，读者可以直接将代码跑起来  
注：网上搜索的资源

#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    
    from PyQt5.QtCore import QThread, QWaitCondition, QMutex, pyqtSignal
    from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QProgressBar
    
    class Thread(QThread):
    
        valueChange = pyqtSignal(int)
    
        def __init__(self, *args, **kwargs):
            super(Thread, self).__init__(*args, **kwargs)
            self._isPause = False
            self._value = 0
            self.cond = QWaitCondition()
            self.mutex = QMutex()
    
        def pause(self):
            print("线程休眠")
            self._isPause = True
    
        def resume(self):
            print("线程启动")
            self._isPause = False
            self.cond.wakeAll()
    
        def run(self):
            while 1:
                self.mutex.lock()
                if self._isPause:
                    self.cond.wait(self.mutex)
                if self._value > 100:
                    self._value = 0
                self._value += 1
                self.valueChange.emit(self._value)
                self.msleep(100)
                self.mutex.unlock()
    
    
    class Window(QWidget):
    
        def __init__(self, *args, **kwargs):
            super(Window, self).__init__(*args, **kwargs)
            layout = QVBoxLayout(self)
            self.progressBar = QProgressBar(self)
            layout.addWidget(self.progressBar)
            layout.addWidget(QPushButton('休眠', self, clicked=self.doWait))
            layout.addWidget(QPushButton('唤醒', self, clicked=self.doWake))
    
            self.t = Thread(self)
            self.t.valueChange.connect(self.progressBar.setValue)
            self.t.start()
    
        def doWait(self):
            self.t.pause()
    
        def doWake(self):
            self.t.resume()
    
    
    if __name__ == '__main__':
        import sys
        import cgitb
        sys.excepthook = cgitb.enable(1, None, 5, '')
        from PyQt5.QtWidgets import QApplication
        app = QApplication(sys.argv)
        w = Window()
        w.show()
        sys.exit(app.exec_())