在进入单独的函数之前强制Qt GUI进行更新 [英] Forcing the Qt GUI to update before entering a separate function

问题描述

这似乎应该是自动的，但显然不是。我有以下代码：

This seems like it should be automatic, but apparently it's not. I have the following code:

    ui.my_label->setText("Test 1...");
    ui.my_label->adjustSize();

    processThatTakesAbout30SecondsToFinish(files[0].toStdString());

    ui.my_label->setText("Finished.");
    ui.my_label->adjustSize();

发生的是我永远不会看到 Test1 ...，，因为GUI似乎挂起，直到下面的函数完成，我eventaully只看到完成。

What is happening is that I never see "Test1...", as the GUI seems to hang until the following function completes, and I eventaully only see "Finished.".

如何在进入该功能之前确认GUI正在更新？

谢谢。

How can I make sure the GUI is updating before it enters that function?
Thanks.

推荐答案

您可以在输入代码之前处理事件队列

You shuld be able to process the event queue before entering your code if you;

#include <QApplication>

，当您想刷新GUI时，请呼叫

and, when you want to refresh your GUI, call;

qApp->processEvents();

请注意，让长时间运行的进程调用该函数可能是个好主意，让您的GUI感觉更加敏感。

Note that it may be a good idea to let your long running process call that function now and then, to make your GUI feel more responsive.

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