[Qt-interest] Images in tooltips

[Pritam Ghanghas]

On Wed, 2010-12-22 at 20:10 +0530, Yves Bailly wrote:
> newsletters at philippberger.de a écrit :
> >> 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.
>  > [...]
> > 
> > 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()));
> > }
> 
> Philipp, that's simply brilliant, works great :-)
> 
> Thanks a lot for this nice trick.
> 

Hi,

I tried this. Didn't work for me. I am appending a small code snippet
almost same as yours. Tootip shows some blank placeholder image instead
of actual image. I have set the image onto label just to show that image
was loaded. Do you see anything wrong in it? 

#include <QtGui>

int main(int argc, char * argv[])
{
    QApplication app(argc, argv);

    QImage image("/usr/share/icons/Human/32x32/actions/sleep.png");
    QByteArray ba;
    QBuffer buffer(&ba);
    buffer.open(QIODevice::WriteOnly);
    image.save(&buffer, "PNG");
    QString imgStr = QString("<img src=\"data:image/png;base64,%1
\">").arg(QString(buffer.data().toBase64()));


    QLabel label2;
    label2.setPixmap(QPixmap::fromImage(image));
    label2.resize(100,100);
    label2.show();
    label2.setToolTip(imgStr);

    app.exec();
}


-- 
Thanks,
Pritam


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