Hi,
On 26/10/2010, at 12:02 AM, ext andrew.christ...@nokia.com wrote:
> Is there any way to quickly extract R,G, and B values from color property?
>
> I tried the obvious things like:
>
> Item {
> property color myColor: "blue"
>
> function getRed() {
> return myColor.red();
> }
> }
>
> but I don't get anything useful. It looks like a QML color is exactly an
> underlying QColor object, but the QColor object isn't exposing any of the
> internal color information in a way that I can reach it from QML.
Unfortunately there isn't any easy, automatic way to do this as the moment. QML
sees and manipulates color as a single value, rather than as an object with
properties (QColor itself doesn't give any "object" interface -- e.g. it is not
a QObject -- which is why this doesn't automatically work from QML). QML adds
object-like support for some other simple value types (such as QRect, QFont,
etc), so it should be possible to add similar support for QColor (could you add
a suggestion to http://bugreports.qt.nokia.com if you'd like to see this
added?).
If you only need R,G, and B (and not A), you might be able to use a technique
like that that described at http://ejohn.org/blog/numbers-hex-and-colors/ to
extract the values. Alternatively, you could expose some helper functions from
C++ to do the conversions for you, for example
Q_INVOKABLE int getRed(const QColor &color) { return color.red(); }
Regards,
Michael
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