[Qt-interest] Images in tooltips

[newsletters at philippberger.de]

>
> Hello everyone,
>
> I need to display images in tooltips. But the images can't be stored as
> internal resources or on the local disk - they're dynamically computed
> and stored as QImage instances.
>
> Searching for a way to do this, I found this old thread:
> http://lists.trolltech.com/qt-interest/2007-07/thread00818-0.html
> ...suggesting to create a custom QAbstractFileEngine.
>
> Is there any other easier approach to achieve this?
>
> Thanks for any hint.
>
> Regards,
>
> --
>       /- Yves Bailly - Software developper  -\
>       \- Sescoi R&D  - http://www.sescoi.fr -/
> "The possible is done. The impossible is being done. For miracles,
> thanks to allow a little delay."
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>
Hi Yves,

Easy enough using some HTML hacks :)
I wrote a small function that will convert your QImage to a QString you
can embed into a tooltip:

QString getImageAsText(const QImage AImage) {
	QByteArray ba;
	QBuffer buffer(&ba);
	buffer.open(QIODevice::WriteOnly);
	AImage.save(&buffer, "PNG");
	return QString("<img
src=\"data:image/png;base64,%1\">").arg(QString(buffer.data().toBase64()));
}

HTML allows for base64 encoded data in the "src" tags, look here for more
information: http://www.greywyvern.com/code/php/binary2base64

You can use it like this:
myWidget->setToolTip(QString("Text before%1Text
after").arg(getImageAsText(image)));

I tried it and it worked like a charm, hope that works for you, too ;)
Attached is the function and an example as txt file!

Cheers,

Philipp
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