PyQT 在调用其他函数之前强制更新 textEdit [英] PyQT force update textEdit before calling other function

问题描述

我的问题是关于 PyQT5.我尝试创建一个带有按钮的对话框窗口，单击该按钮时

My question concerns PyQT5. I try to have a dialog window with a button that when clicked

1. 更新 QTextEdit 字段的一些文本
2. 调用一个函数(需要很长时间才能终止)

像这样:

class StartDialog(QtWidgets.QWidget, start_dialog_ui.Ui_Dialog):
  def __init__(self, parent):
    super(self.__class__, self).__init__()
    self.setupUi(self)
    self.OKButton.clicked.connect(self.start)

 def start(self):
    self.startDialogTextEdit.append("simulation running ...")
    run_lengthy_function(self)

但是，当我运行 GUI 时，我注意到文本仅在 冗长函数终止之后更新，尽管 QTextEdit.append 在冗长函数之前调用.如何强制提前更新文本?

However, when I run my GUI I notice that the text is updated only after the lengthy function has terminated, although the QTextEdit.append is called before the lengthy function. How can I enforce that the text is updated in advance?

到目前为止我尝试过的(但没有奏效)是让 Python 在触发冗长的函数调用之前等待一段时间，即

What I tried so far (but didn't work) was to let Python wait some time before triggering the lengthy function call, i.e.

from time import sleep

class StartDialog(QtWidgets.QWidget, start_dialog_ui.Ui_Dialog):
  def __init__(self, parent):
    super(self.__class__, self).__init__()
    self.setupUi(self)
    self.OKButton.clicked.connect(self.start)

 def start(self):
    self.startDialogTextEdit.append("simulation running ...")
    sleep(5)
    run_lengthy_function(self)

推荐答案

重绘在事件循环中被调用，因此整个线程休眠不会改变任何东西.

The repaint is called in event loop so sleep the whole thread does not change anything.

您可以通过以下方式手动调用重绘:

You can call repaint manually by:

self.startDialogTextEdit.repaint()

或调用静态方法:

QCoreApplication.processEvents()

在内部也调用重绘

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