Replacing GetAsyncKeyState in painting code

Perdrix

I'm converting some Windows code that has the following in the repainting code:

bool forceHere  = (GetAsyncKeyState(VK_SHIFT) & 0x8000);

The intention is that if the shift key is pressed at this time, then things are drawn a little differently.

I think that I can remove the call to GetAsyncKeyState(), and change forceHere from being a local variable to be a member variable, I could then write a MouseMove handler like this:

void ClassName::mouseMoveEvent(QMouseEvent* e)
{
	if (e->modifiers() & Qt::ShiftModifier)
		forceHere = true;
	else
		forceHere = false;

	update();
}

which I think would have the same end result. Is that correct?

Thanks
David

Christian Ehrlicher

You can also check the modifier state during your paintEvent.

Perdrix

At least on Qt 5.5 I get:

error C2039: 'modifiers': is not a member of 'QPaintEvent'

D.

Christian Ehrlicher

@Perdrix said in Replacing GetAsyncKeyState in painting code:

error C2039: 'modifiers': is not a member of 'QPaintEvent'

And that's correct. It's a function of QGuiApplication as properly documented.