pythonqt线程更新程序，使用单独的线程更新GUI项。
qt-thread-updater的Python项目详细描述
pythonqt线程更新程序使用单独的线程更新GUI项。在
这个库允许您从一个单独的线程高效地更新qtgui元素。Qt-GUI元素不是线程 安全。方法调用，如标签.setText不要在单独的线程中工作。这个图书馆解决了这个问题。在
公用事业
ThreadUpdater提供了几个实用程序来帮助更新小部件的值。在
- call_latest - Call the given function with the most recent value in the main thread using the timer.
- It is safe to call this many times with the same function.
- If the given function is called multiple times it is only called once with the most recent value.
- call_in_main - Call the given function in the main thread using the timer.
- Every time you call this function the given function will be called in the main thread
- If the given function is called multiple times it will be called every time in the main thread.
- If this function is called too many times it could slow down the main event loop.
- register_continuous - Register a function to be called every time the ThreadUpdater.update method is called.
- The timeout variable (in seconds) indicates how often the registered functions will be called.
- delay - Call a function after the given number of seconds has passed.
- This will not be accurate. Accuracy can be improved by lowering the timeout to increase how often the timer runs.
线程更新程序示例
下面是一些通常如何使用ThreadUpdater的示例。在
简单线程示例
下面的示例告诉要运行的更新lbl.SETEXT文本在具有最新值的主线程中。在
importtimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updaterimportget_updaterapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])lbl=QtWidgets.QLabel("Latest Count: 0")lbl.resize(300,300)lbl.show()data={'counter':0}defrun(is_alive):is_alive.set()whileis_alive.is_set():text='Latest Count: {}'.format(data['counter'])get_updater().call_latest(lbl.setText,text)data['counter']+=1time.sleep(0.001)# Not needed (still good to have some delay to release the thread)alive=threading.Event()th=threading.Thread(target=run,args=(alive,))th.start()app.exec_()alive.clear()
持续更新示例
下面的示例每次线程更新程序.update（）从计时器调用。 如果没有要更新标签的新数据，这可能效率低下。在
^{pr2}$调用主要示例
下面的示例每次都调用append函数。它可能没有效率。在
importtimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updaterimportget_updaterapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])text_edit=QtWidgets.QTextEdit()text_edit.resize(300,300)text_edit.setReadOnly(True)text_edit.show()data={'counter':0}defrun(is_alive):is_alive.set()whileis_alive.is_set():text='Main Count: {}'.format(data['counter'])get_updater().call_in_main(text_edit.append,text)data['counter']+=1time.sleep(0.01)# Some delay/waiting is requiredalive=threading.Event()th=threading.Thread(target=run,args=(alive,))th.start()app.exec_()alive.clear()
延迟示例
下面的示例在经过X秒数后调用append函数。延迟功能不会 精确，但保证函数在X秒数后被调用。为了提高准确度 ThreadUpdater使其以更快的速度运行的超时时间更短。在
importtimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updaterimportget_updaterapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])text_edit=QtWidgets.QTextEdit()text_edit.resize(300,300)text_edit.setReadOnly(True)text_edit.show()now=time.time()defupdate_text(set_time):text_edit.append('Requested {:.04f} Updated {:.04f}'.format(set_time,time.time()-now))# Lower the timeout so it runs at a faster rate.get_updater().timeout=0# 0.0001 # Qt runs in millisecondsget_updater().delay(0.5,update_text,0.5)get_updater().delay(1,update_text,1)get_updater().delay(1.5,update_text,1.5)get_updater().delay(2,update_text,2)get_updater().delay(2.5,update_text,2.5)get_updater().delay(3,update_text,3)app.exec_()
小工具
我决定在这个库中包含一些有用的Qt小部件。在
- QuickPlainTextEdit - Used to display fast streams of data
- QuickTextEdit - Display fast streams of data with color.
快速明文编辑
快速显示来自单独线程的数据。在
importtimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updater.widgets.quick_text_editimportQuickPlainTextEditapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])text_edit=QuickPlainTextEdit()text_edit.resize(300,300)text_edit.show()data={'counter':0}defrun(is_alive):is_alive.set()whileis_alive.is_set():text='Main Count: {}\n'.format(data['counter'])text_edit.write(text)data['counter']+=1time.sleep(0.0001)# Some delay is usually required to let the Qt event loop run (not needed if IO used)alive=threading.Event()th=threading.Thread(target=run,args=(alive,))th.start()app.exec_()alive.clear()
快速文本编辑
使用颜色快速显示来自单独线程的数据。在
importtimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updater.widgets.quick_text_editimportQuickTextEditapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])text_edit=QuickTextEdit()text_edit.resize(300,300)text_edit.show()data={'counter':0}defrun(is_alive):is_alive.set()whileis_alive.is_set():text='Main Count: {}\n'.format(data['counter'])text_edit.write(text,'blue')data['counter']+=1time.sleep(0.0001)# Some delay is usually required to let the Qt event loop run (not needed if IO used)alive=threading.Event()th=threading.Thread(target=run,args=(alive,))th.start()app.exec_()alive.clear()
QuickTextEdit重定向
用颜色在QTextEdit中显示打印（stdout和stderr）。在
importsysimporttimeimportthreadingfromqtpyimportQtWidgetsfromqt_thread_updater.widgets.quick_text_editimportQuickTextEditapp=QtWidgets.QApplication.instance()orQtWidgets.QApplication([])text_edit=QuickTextEdit()text_edit.resize(300,300)text_edit.show()sys.stdout=text_edit.redirect(sys.__stdout__,color='blue')sys.stderr=text_edit.redirect(sys.__stderr__,color='red')data={'counter':0}defrun(is_alive):is_alive.set()whileis_alive.is_set():stdout_text='Main Count: {}'.format(data['counter'])# Print gives \n automaticallyerror_text='Error Count: {}'.format(data['counter'])# Print gives \n automatically# Print automatically give '\n' with the "end" keyword argument.print(stdout_text)# Print will write to sys.stdout where the rediect will write to text_edit and stdoutprint(error_text,file=sys.stderr)# Print to sys.stderr. Rediect will write to text_edit and stderrdata['counter']+=1# Some delay is usually desired. print/sys.__stdout__ uses IO which gives time for Qt's event loop.# time.sleep(0.0001)alive=threading.Event()th=threading.Thread(target=run,args=(alive,))th.start()app.exec_()alive.clear()
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