Infinite tooltip

ademmler

Hi there,

I need to create an infinite tooltip at mouse position.

From the documentation:
*[static] void QToolTip::showText(const QPoint &pos, const QString &text, QWidget *w, const QRect &rect, int msecDisplayTime)

This is an overloaded function.
This is similar to QToolTip::showText(pos, text, w, rect) but with an extra parameter msecDisplayTime that specifies how long the tool tip will be displayed, in milliseconds.
This function was introduced in Qt 5.2.*

I tried this - and it does not have any effect. The tooltip vanishes short after appearing. Tested on windows and macOS.

QString eyedropperToolTip;
eyedropperTooltip += "Put some information ...";

QRect rect;
QToolTip::showText(ui->graphicsView->mapToGlobal(pos), eyedropperToolTip, nullptr, rect, 10000);

Any hint is welcome. thx in advance

Christian Ehrlicher

It's working fine for me in a small testcase as long as the focus does not change.

Bonnie

Maybe it is not related to the time, looking into the qtooltip.cpp souce code I find that there're some app events will cause it to hide :

bool QTipLabel::eventFilter(QObject *o, QEvent *e)
{
    switch (e->type()) {
#ifdef Q_OS_MACOS
    case QEvent::KeyPress:
    case QEvent::KeyRelease: {
        const int key = static_cast<QKeyEvent *>(e)->key();
        // Anything except key modifiers or caps-lock, etc.
        if (key < Qt::Key_Shift || key > Qt::Key_ScrollLock)
            hideTipImmediately();
        break;
    }
#endif
    case QEvent::Leave:
        hideTip();
        break;


#if defined (Q_OS_QNX) // On QNX the window activate and focus events are delayed and will appear
                       // after the window is shown.
    case QEvent::WindowActivate:
    case QEvent::FocusIn:
        return false;
    case QEvent::WindowDeactivate:
        if (o != this)
            return false;
        hideTipImmediately();
        break;
    case QEvent::FocusOut:
        if (reinterpret_cast<QWindow*>(o) != windowHandle())
            return false;
        hideTipImmediately();
        break;
#else
    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate:
    case QEvent::FocusIn:
    case QEvent::FocusOut:
#endif
    case QEvent::Close: // For QTBUG-55523 (QQC) specifically: Hide tooltip when windows are closed
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::Wheel:
        hideTipImmediately();
        break;

    case QEvent::MouseMove:
        if (o == widget && !rect.isNull() && !rect.contains(static_cast<QMouseEvent*>(e)->pos()))
            hideTip();
    default:
        break;
    }
    return false;
}