So, finally I had to switch to QMessageBox for this case. QML window is
just not updated without user interaction due to an unknown reason....
On 2/27/2021 4:52 PM, Alexander Dyagilev wrote:
Hello,
I'm trying to add quit confirmation message at OS shutdown according
to this example:
https://doc.qt.io/qt-5/qsessionmanager.html#allowsInteraction
I interact with the user via QML interface. It is asynchronous, so I
use slots/signals. And I use additional QEventLoop to stay inside of
QGuiApplication::commitDataRequest call while interacting with the user.
The trouble is that after I shutdown OS - my app prevents OS to
shutdown and it's good, but its screen is just white, or contains old
state without the confirmation dialog. I need to hide/restore window
or change its size, or do some mouse clicks inside of it to force it
repaint. When it repaint all is OK and my confirmation dialog is there.
Is this a bug? Is there a workaround?
This is the code I use:
voidAppQuitConfirmationAtOsShutdownManager::onCommitDataRequest(
QSessionManager&m)
{
Q_ASSERT_SAME_THREAD;
if(!m_ui->isConfirmationRequired())
return;
if(!m.allowsInteraction())
return;
boolisConfirmed=true;
QEventLooploop;
qtconnect(m_ui.data(),&AppQuitConfirmationUiManager::confirmationResult,
&loop,[&](boolconfirmed)
{
isConfirmed=confirmed;
loop.quit();
},
Qt::QueuedConnection);
m_ui->requestConfirmation();
loop.exec();
m.release();
if(!isConfirmed)
m.cancel();
}
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