Problem Qt 4.8 + MAC -> mouse buttons after drag and drog

[devarde]

I am using Qt 4.8 + MAC and when I perform a drag and drop the MAC understands that after the drop the left mouse button is pressed, tough, as matter of fact, it isn't.

How I can work around this problem?

Thanks, beforehand.

[SGaist]

Hi and welcome to devnet,

What do you mean by "the MAC understands that after the drop the left mouse is pressed" ?

Also what exact version of Qt 4.8 and OS X are you using ?

[devarde]

After to finish the drag-and-drop, when I read the mouse state, Qt informs me that the mouse left button is pressed.
After the drag and drop I need to perform a mouse wheel:

void MyWidget::doWheel ( QWheelEvent * event )
{
    if (layerStack)
    {
        layerStack->handleEvent(EventData(event, realWidget));

    }
}

EventData has the following code:

init(e, e->buttons(), e->modifiers());

void EventData::init(QInputEvent *e, Qt::MouseButtons buttons, Qt::KeyboardModifiers keyboard)
{
    if (buttons & Qt::LeftButton) {
        modifiers |= MouseEventModifier::Left;
    }
    if (buttons & Qt::RightButton) {
        modifiers |= MouseEventModifier::Right;
    }
    if (buttons & Qt::MidButton) {
        modifiers |= MouseEventModifier::Middle;
    }
    ...
}

In this moment it recognizes as Qt::LeftButton was active.

Qt: 4.8.7
Mac: 10.10.5 (OSX Yosemite)

[SGaist]

Why do you need that scroll event for ?

[devarde]

With drag and drop I drag a image to the main panel.
In the main panel a image can be actually a series of images. In this case I advance the images scrolling it. It is the purpose of scrolling. It is an event that can be occur any moment after the drag-and-drop.

If I click on the panel with any mouse button before to scroll, the scroll works, but this is not desirable (the forced click)

[SGaist]

Why not use scrollTo ?

[devarde]

After so much Googling I found my answer. The problem is a Qt 4.8.x bug on OSX.
ACcording the issue tracker this question was solved in Qt 5.x

[SGaist]

Can you share the bug report link ?

[devarde]

@SGaist https://bugreports.qt.io/browse/QTBUG-27634

I don't have any option to mark this question as solved. Does it because I didn't created it with a question flag or something like that? If you can, I would be glad if you do that to maybe help other users with the same problem.

[SGaist]

Don't you have that option with the "Topic Tool" button ?

[devarde]

Sorry. I saw all buttons, except that one hehe.

[SGaist]

No worries, that happens ;)