qt:将窗口移出屏幕后，如何将其移回到默认位置，包括默认定位行为? [英] qt: after moving window off-screen, how to move it back to default position, including default positioning behaviour?

问题描述

[qt 4.8]

要获得正确的窗口尺寸及其框架，请执行以下操作(如

To get correct window dimensions including its frame, I do the following (as described e.g. here, see comment from Daniel Hedberg).

mainWindow.move(-50000, -50000);
mainWindow.show();

// do something with the window dimensions

mainWindow.move(0, 0);
mainWindow.show()

这很好，但是，我对move(0,0)调用有问题:它使窗口总是出现在位置(0,0)，而我希望具有默认行为，也就是说，应用程序仅向窗口管理器发出建议的建议，即(0,0)是放置窗口的好地方，并且WM可能会决定在必要时移动它以避免重叠.换句话说，我想切换回Qt的默认行为，好像根本没有调用move一样.

This works fine, however, I have a problem with the move(0,0) call: It makes the window always appear at position (0,0), while I would like to have the default behaviour, this is, the application only suggests to the window manager that (0,0) is a good place to position the window, and the WM might decide to shift it if necessary to avoid overlapping. In other words, I would like to switch back to Qt's default behaviour as if there weren't a call to move at all.

我该怎么做?

推荐答案

现在看一下Qt的源代码，我可以部分回答自己的问题:将对move的调用转换为定位建议，而不是请求，执行此操作:

Looking into the source code of Qt, I can now partially answer my own question: To convert a call to move into a suggestion for positioning instead of a request, do this:

mainWindow.move(100, 100);
mainWindow.setAttribute(Qt::WA_Moved, false);
mainWindow.show();

我已经使用Qt 4.8.4在X11下测试了代码，希望它也可以在其他平台上使用.

I've tested the code under X11 using Qt 4.8.4, and hopefully it works with on other platforms too.

不幸的是，这并不能解决我遇到的问题，即使用show获取屏幕外窗口的(装饰)尺寸，然后将其移至屏幕，再次调用show.似乎第一次调用show会直接设置特定于平台的窗口管理器标志，这些标志在第二次调用中不会完全重置和重新评估.实际上，我会认为这是Qt中的错误，因此我将相应地进行报告.

Unfortunately, this doesn't solve the very problem I have, namely to use show to get the (decorated) dimensions of an off-screen window which then gets moved to the screen, calling show again. It seems that the first call to show directly sets platform-specific window manager flags which aren't completely reset and reevaluated in the second call. Actually, I'm going to think that this is a bug in Qt, so I'll report it accordingly.

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