qt : show mouse position like tooltip

问题

As I write on title, I hope to show mouse position like tooltip.
To do that, I think that I have to override QCursor, right?
But I don't know the details of QCursor and how to make a new cursorShape.
Is there any example like this?

回答1:

Assuming you want a coordinate readout as you move the cursor (like in many graphics or CAD applications), you really do not want to override QCursor.

The most efficient approach depends on what widget will be providing the coordinates, but in most cases the simplest way will be to setMouseTracking(true) for the widget, and override it's mouseMoveEvent(QMouseEvent* event) to display a QToolTip like so:

void MyWidget::mouseMoveEvent(QMouseEvent* event)
{
    QToolTip::showText(event->globalPos(),
                       //  In most scenarios you will have to change these for
                       //  the coordinate system you are working in.
                       QString::number( event->pos().x() ) + ", " +
                       QString::number( event->pos().y() ),
                       this, rect() );
    QWidget::mouseMoveEvent(event);  // Or whatever the base class is.
}

Normally you would not 'force' a tooltip like this; you would use QWidget::setToolTip(const QString&) or capture tooltip events in QWidget::event(QEvent*). But normal QToolTips only appear after short delay, but you want them updated continuously.

I should state that I haven't tried this, but this is the way I would do it. Hope that helps!

来源：https://stackoverflow.com/questions/12417636/qt-show-mouse-position-like-tooltip

标签

cursor

overriding