Thursday, December 13. 2007
got a present today
Today I checked my mails and saw a few Phonon-related commits. I always read those commit messages with priority... and I was a bit surprised. I knew this day would come. But I didn't know when and I didn't know whether it's going to be GPL+commercial or LGPL. And I found the commit messages all said "[License: LGPL]". *dance* 
Now what does that license mean? It means everybody can contribute without having to sign a copyright assignment. That just makes it so much easier to handle contributions!
Now I know what code I'm going to read and play with the next days. 
Tuesday, December 11. 2007
Jetzt hat's mich doch noch erwischt!
Okay, der Grund, warum ich schon länger nichts mehr geschrieben hab, ist ganz einfach: ich bin schon ne Weile krank 
und da unternimmt man nun mal nicht so viel und hat deswegen auch nicht so viel zu schreiben.
In genau einer Woche bin ich endlich zu Hause und vereint mit meinem Seelenpartner Habe schon gleich einen Arzttermin für den nächsten Tag, aber ehrlich gesagt hoffe ich, dass bis dahin die Schmerzen aus den Bronchien weg sind! Wer will, darf/soll bitte für mich beten!
Sunday, December 9. 2007
going crazy
I have nothing to say in my defense. But I must be crazy.
See for yourself:
Saturday, December 8. 2007
QWidget::render
Yesterday on IRC I was reminded of the nice abstractions Qt has with QPaintDevice. (There are many useful paint devices, but most important for this discourse are QWidget, QPixmap and QImage.) So there are several things Qt4 allows you to do:
- QPainter::setRedirected
- QPixmap::grabWidget
- QWidget::render
Inspired by the video from Mirco Müller I wanted to see what could be done with those functions. I started with setRedirected but couldn't make it work immediately. So I did what the docs said and tried QPixmap::grabWidget. And without much effort I was able to draw a widget someplace else. But then I wanted to transform the image which needs a conversion to QImage. Expecting that Qt might optimize a bit if it renders directly into a QImage instead of a QPixmap and then converts to QImage I used QWidget::render to render a widget directly onto a QImage. Piece of cake. Now I had a QImage, transformed and painted into a different widget. Last missing piece is to update the image if the original widget changes (e.g. mouse or keyboard events). QObject::installEventFilter makes it easy to listen for paint events on the other widget and update accordingly. And to make it a fully featured class I added the ability to look for child widget paint events and made it repaint only as little as needed.
The result is this code:
{
QApplication app(argc, argv);
QWidget topLevel;
QWidget w(&topLevel);
WidgetMirror leMirror(&topLevel);
leMirror.setMirroredWidget(&w);
QPushButton b("Button", &w);
QLineEdit le(&w);
QListWidget lw(&w);
lw.setMaximumHeight(64);
lw.addItems(QStringList() << "Item 1" << "Item 2" << "Item 3" << "Item 4" << "Item 5" << "Item 6" << "Item 7" << "Item 8");
QGridLayout layout(&w);
layout.setMargin(0);
layout.addWidget(&b, 0, 0, Qt::AlignBottom);
layout.addWidget(&le, 0, 1, Qt::AlignBottom);
layout.addWidget(&lw, 0, 2, Qt::AlignBottom);
QVBoxLayout outerLayout(&topLevel);
outerLayout.setSpacing(0);
outerLayout.addWidget(&w);
outerLayout.addWidget(&leMirror);
topLevel.show();
return app.exec();
}
Today I wanted to see whether this eye-candy can be put into KDE at some place and I have not succeeded. Perhaps somebody can make a mockup of how this could be used without making you feel "something is wrong".
Anyway more pictures:
Notice that all this is just fooling around with what Qt provides. This is neither useful nor going into KDE 4.0 
For the interested people, the implementation of WidgetMirror looks like this:
Continue reading "QWidget::render"
Wednesday, December 5. 2007
Sinterklaas
Hier in Spanje vieren ze geen Sinterklaas. Dat komt omdat hij vandaag op de boot naar Nederland gegaan is!
Tuesday, December 4. 2007
spanischer Unterricht...
Juhuuu!!! Matthias, ich komme!! 
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