multithreading - Qt: Using thread to construct widgets -

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In my application, I have a QWidget MyWidget , which I want to create after push button clicks is required. Now, MyWijet is a heavy widget with many children's components and there are many components of those children's components. Now, when I try to create a widget after pressing the push button, it can sometimes be used for widgets. I do not like, which I do not like Therefore, I have to build the widget before clicking pushbutan and put an example on hand. Thread looks right for this job. But I have very little information about QT threads.

Now someone can suggest me how to deal with the problem and what can be done to solve this problem?

Note: To say clearly why my widget is so heavy, in MyWdtate, I have 7 * 24 widgets, each containing a stacked widget that has two widgets containing each button. .

QT does not support the creation of widgets in non-gui threads. The reason is simple: Widget Consultants Threads-free to access to unsafe APIs that can be used by the main thread at any time. Even if this may seem to work, it is actually a bug in your code if you do this.

Generally, parallel non-graphical, long-running initial tasks in their heavyweight widget classes. You can use QtConcurrent :: run for this purpose, of course, you need to make your implementation thread-safe for this purpose.

You should also make sure that you use any blocked API in your widget code, absolutely, not positively. There is usually no GUI code, but a widget constructor should never be specifically:

  • Wait for any file access to finish,

  • Wait

  • any waitForXxxx

  • < / Li>

  • Code> Methods in QT.


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