浮动子QMainWindow（QMainWindow作为子窗口部件的主要QMainWindow）

问题描述

我使用 QMainWindow 作为我的主要 QMainWindow 的子。我得到一个其他区域，我可以用于可停靠的小部件（ QDockWidget ）。

I use a QMainWindow as child of my main QMainWindow. By that I get an other area which I can use for dockable widgets (QDockWidget).

根据以下帖子这是好的，它也为我工作完美。

According to the following posts this is OK, it also works perfectly for me.

1. https://qt-project.org/forums/viewthread/17519
2. http://www.qtcentre.org/threads/12569-QMainWindow-as-a-child-of-QMainWindow

要使 QMainWindow 正常的窗口小部件，我取消设置窗口标志，这个技巧是在上面的一个帖子中提到。

To make the QMainWindow behaving as a normal widget, I unset the window flag, this trick is mentioned in one of the posts above.

现在我也想要能够浮动这个孩子 QMainWindow 及其所有停靠的窗口小部件。换句话说，我想恢复步骤使其成为一个正常的小部件。不幸的是，这不工作。

Now I also want to be able to float this child QMainWindow with all its docked widgets. In other words, I want to revert the step "making it a normal widget". Unfortunately, this does does not work. It is gone from the main window, but not visible at all.

以任何方式解决这个问题？

Any way to resolve it?

// this is the child QMainWindow
if (this->m_infoAreaFloating)
{
    // this should give me a floating window besides the main window
    this->setWindowFlags(Qt::Desktop);
    this->show();
}
else
{
    // make this compliant as QWidget
    this->setWindowFlags(this->windowFlags() & ~Qt::Window);
}

相关：，

推荐答案

Qt :: Desktop 标志不是你自己应该设置的标志。

The Qt::Desktop flag is not something you are supposed to set by yourself.

你需要设置 Qt： ：Window flag：

You need to set the Qt::Window flag:

setWindowFlags(m_infoAreaFloating ? Qt::Window : Qt::Widget);
show();

没有意义 this-> windowFlags（）& 〜Qt :: Window ：当您设置孤立 Qt :: Window 标志时，您已清除所有其他窗口标志。你完全控制了旗帜，没有必要保留一些其他旗帜：没有。

There's no point to this->windowFlags() & ~Qt::Window: you've cleared all other window flags when setting the lone Qt::Window flag. You're in full control of the flags, there's no need to preserve some "other" flags: there are none.

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