The tootip of QToolButton does not appear when hover into the button by WinAPI instead of Physical Mouse

[Trong Le]

I use WinAPI to move mouse and hover into QToolButton but its tooltip does not appear. My code is below:

int moveMouseToEx_win ( const int& nX , const int& nY )
{  

	// Get current screen size
	double fScreenWidth		= ::GetSystemMetrics ( SM_CXSCREEN ) - 1 ; 
	double fScreenHeight	= ::GetSystemMetrics ( SM_CYSCREEN ) - 1 ; 

	// Translate it into mouse coordinate
	double fX = nX * ( 65535.0f / fScreenWidth ) ;
	double fY = nY * ( 65535.0f / fScreenHeight ) ;

	// Initialize a mouse input struct
	INPUT  mouseInput ;
	::SecureZeroMemory ( &mouseInput , sizeof(INPUT) ) ;

	mouseInput.type			= INPUT_MOUSE ;
	mouseInput.mi.dwFlags	= MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE ;
	mouseInput.mi.dx			= (long)fX ;
	mouseInput.mi.dy			= (long)fY ;

	return sendInput(&mouseInput,1);
}

However, I see that the mouse is already on the button but its tooltip does not appear.

I tried with physcal mouse and it works normaly. Iam working on Qt 5.15.2 x64
Please support me to solve this issue.

Regards,

[Trong Le]

@Trong-Le I forgot note that Iam working on PyQt 5.15.2 x64

[kkoehne]

@Trong-Le Don't know the answer, but the code that triggers the tooltip to show eventually is in QApplication::notify. You could try and see whether (and which which attributes the mouse move event is delivered to the application by e.g. calling a custom event handler on the QApplication object (see QObject.installEventFilter).

    case QEvent::MouseMove: {
        QMouseEvent* mouse = static_cast<QMouseEvent*>(e);
        QPoint relpos = mouse->position().toPoint();

        if (e->spontaneous()) {
            // ...
            if (e->type() == QEvent::MouseMove && mouse->buttons() == 0
                && w->rect().contains(relpos)) { // Outside due to mouse grab?
                d->toolTipWidget = w;
                d->toolTipPos = relpos;
                d->toolTipGlobalPos = mouse->globalPosition().toPoint();
                QStyle *s = d->toolTipWidget->style();
                int wakeDelay = s->styleHint(QStyle::SH_ToolTip_WakeUpDelay, nullptr, d->toolTipWidget, nullptr);
                d->toolTipWakeUp.start(d->toolTipFallAsleep.isActive() ? 20 : wakeDelay, this);
            }

[Trong Le]

@kkoehne Many thanks, I will check more in object events.