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Fix Qt HighGUI lifecycle issue when external QApplication exists

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Respect QApplication::quitOnLastWindowClosed() before calling qApp->quit().
This prevents OpenCV from unintentionally terminating externally managed
Qt applications when the last HighGUI window is closed.

Fixes #28291
This commit is contained in:
0AnshuAditya0
2025-12-26 13:36:17 +05:30
parent cff7581175
commit 5d5b5c14a9
1 changed files with 9 additions and 6 deletions
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15
modules/highgui/src/window_QT.cpp
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@@ -854,14 +854,17 @@ GuiReceiver::GuiReceiver() : bTimeOut(false), nb_windows(0)
void GuiReceiver::isLastWindow()
{
if (--nb_windows <= 0)
if (qApp->quitOnLastWindowClosed())
{
delete guiMainThread;//delete global_control_panel too
guiMainThread = NULL;
if (doesExternalQAppExist)
if (--nb_windows <= 0)
{
qApp->quit();
delete guiMainThread; // delete global_control_panel too
guiMainThread = NULL;
if (doesExternalQAppExist)
{
qApp->quit();
}
}
}
}