Bring window to front -> raise(),show(),activateWindow() don’t work

问题

In my Qt-application I open a URL in the default-browser. Afterwards I want to bring the main-window of my application to the front again.

I tried all approaches I could find but none worked. All it does is blink in the taskbar (of Window 7) Here’s an example:

this->viewer->show();
this->viewer->raise();
this->viewer->activateWindow();

*viewer is a pointer to a QmlApplicationViewer which is derived from QDeclarativeView

回答1:

This problem is specific to Windows. If the active window belongs to some process, then Windows does not allow other processes to change the active Window.

(Do not try the following: https://wiki.qt.io/Qt_project_org_faq#QWidget_::activateWindow.28.29_-_behavior_under_windows)

回答2:

try this:

viewer.setWindowState( (windowState() & ~Qt::WindowMinimized) | Qt::WindowActive);
viewer.raise();  // for MacOS
viewer.activateWindow(); // for Windows

it work in my project ( in my project viewer is QMainWindow): https://github.com/iptton/Rythem .

回答3:

for ( QWindow* appWindow : qApplication.allWindows() )
{
  appWindow->show(); //bring window to top on OSX
  appWindow->raise(); //bring window from minimized state on OSX

  appWindow->requestActivate(); //bring window to front/unminimize on windows
}

Note that this also brings up the window from other virtual desktops on both OSX and Windows. I did not test this on linux, it may work though.

回答4:

This issue is not specific to Windows....I have the same issue on Linux. My solution was to close() the window before I re open() it.

来源：https://stackoverflow.com/questions/6087887/bring-window-to-front-raise-show-activatewindow-don-t-work

标签

c++

windows

winapi

foreground