On 29/12/2011, at 1:22 AM, ext Harri Pasanen wrote:
> I wrote my custom QML type, using Qt 4.7.4.
> It is working just fine, except when I run using it I keep getting
> messages like:
>
> QColor::setNamedColor: Unknown color name 'mpaja.lvl'
>
>
> Comes from here:
>
>
> void QColor::setNamedColor(const QString &name)
> {
> if (!setColorFromString(name))
> qWarning("QColor::setNamedColor: Unknown color name '%s'",
> name.toLatin1().constData());
> }
>
>
> I traced it a bit, and it seems to be triggered from
>
> QVariant QDeclarativeStringConverters::variantFromString(const QString &s)
> {
> if (s.isEmpty())
> return QVariant(s);
> bool ok = false;
> QRectF r = rectFFromString(s, &ok);
> if (ok) return QVariant(r);
> QColor c = colorFromString(s, &ok); <<<=== Here
> if (ok) return QVariant(c);
> QPointF p = pointFFromString(s, &ok);
> if (ok) return QVariant(p);
> QSizeF sz = sizeFFromString(s, &ok);
> if (ok) return QVariant(sz);
> QVector3D v = vector3DFromString(s, &ok);
> if (ok) return qVariantFromValue(v);
>
> return QVariant(s);
> }
>
> I'm guessing that when ever a parameter is passed from QML to C++ it
> gets converted to QVariant, which makes a best guess at the underlying type.
>
> But I'm a bit puzzled why only some of the strings elicit this warning.
>
> My custom type looks like:
>
> Spoke { name: "MPaja"; value: "mpaja.lvl" }
>
> and I'm getting a warning for each "value:", but not for "name:"
>
> Is there some naming convention or other method that I should be aware
> off to avoid this needless warning?
Hi Harri,
This issue should be fixed for 4.8
(https://bugreports.qt.nokia.com/browse/QTBUG-19098), if you are able to switch
to that. For 4.7.4 the only way I know of to work around it is to make things
more strongly typed when possible -- e.g. in your above example, if the "value"
property can be of type QString (or QUrl, etc) rather than QVariant, you should
be able to avoid the warning.
Regards,
Michael
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