mouseTracking on QLabels with rich-text?

[Zakum]

Hey-ho!

I've a little problem, I'm sure it's just me not knowing the Qt-context, so hopefully that wont be difficult.

I'd like to use a Picture as mouse Pointer. So I switched my MainWindow to enable mouseTracking via the Designer, added a QLabel, loaded my Pixmap... every thing working so far. Now i wanted to place a QLabel on my Mainwindow. And of course it should also accept the picture as mouse:

//...
QLabel * textLabel = new QLabel(widget);
textLabel->setMouseTracking(true);
textLabel->setCursor(QCursor(Qt::BlankCursor));
//...

//...
QLabel * textLabel = new QLabel(widget);
textLabel->setMouseTracking(true);
textLabel->setCursor(QCursor(Qt::BlankCursor));
//...

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The after a while I add some text to the label:

//...
project1->labels.at(1)->setText("Foo"); //dont bother with the vector, just the place our label from above went ;)
//...

//...
project1->labels.at(1)->setText("Foo"); //dont bother with the vector, just the place our label from above went ;)
//...

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Still everything is fine, I see the text where it should be and I can move the mouse over it.

But if I try the same with html inside the String, all of a sudden the mouseTracking wont work any more:

//...
project1->labels.at(1)->setText("<b>Foo</b>"); 
//...

//...
project1->labels.at(1)->setText("<b>Foo</b>"); 
//...

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When I try to move the mouse over the Label now, the mouse-picture gets caught at the edges of the Label. The mouse is moving on invisibly, emerging on the other side of the Label, and then the pictures changes its location to the new mouse location.

Everything I changed was the added html inside the String. So i guess, my Labeltext changed from plain to richtext. But whats the matter with the mouseTracking not working anymore?

Ohh... and heres the picture-following-the mouse algorithm, just in case...

void MainWindow::mouseMoveEvent(QMouseEvent * pEvent)
{
    ui->fingerLabel->move(pEvent->x() - 50, pEvent->y() + 1);
}

void MainWindow::mouseMoveEvent(QMouseEvent * pEvent)
{
    ui->fingerLabel->move(pEvent->x() - 50, pEvent->y() + 1);
}

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I would realy appreciate some hints.

[high_flyer]

Ohh... and heres the picture-following-the mouse algorithm, just in case...

Maybe I don't understand, but if you want your own image as a mouse cursor, why don't you just set it, instead of the empty cursor you are setting?
You don't need to follow the mouse your self then.
This is probably why your cursor disappears when you go over the label.
I don't know why it disappears only for html text, maybe it uses a default cursor for non html label when none is set.

[Zakum]

Hmm... it's 3:30 in the morning and I'm back again. Oo

Well, setting the Cursor to my image worked pretty well (thanks a lot, had no idea that I can make a cursor from my own pixmaps!).

But actually I need the mouseTracking for some other feautures (e.g. gesture recognition). I surely could use some tricks to make it work without, but thats surly not how nature intended it.

So anybody an idea what could be wrong with my html-labels?

[high_flyer]

So anybody an idea what could be wrong with my html-labels?

What is the problem you are having?
In your original post I thought it was using a custom mouse cursor.
But since now you know how to do that, what is the current problem you have?

[Zakum]

When I try to move the mouse over the Label now, the mouse-picture gets caught at the edges of the Label. The mouse is moving on invisibly, emerging on the other side of the Label, and then the pictures changes its location to the new mouse location.

To make it short:
QLabel with normal text: setMouseTracking(true) works.
QLabel with richtext: setMouseTracking(true) dosn't work.

Whereas doesn't work means: compiles fine without warnings, but doesn't track the mouse while running.

[wysota]

Since the label probably tracks the mouse itself, it eats up the events you would like to be getting. Installing an event filter and tracking the events there might be a solution although I consider it a strange thing that you wish to track gestures when a mouse button is not pressed. You might be interpreting random mouse movements as gestures. It might not be what people expect.