QVideoWidget had to be abandoned in favour of QGraphicsVideoItem. This
is because UBGraphicsMediaItem, i.e the class representing a media
(audio or video) object on the board, is a QGraphicsProxyWidget, and is
used to embed a QWidget into the Scene.
With Phonon's video widget, it was possible to embed the video widget in
this ProxyWidget. This is no longer possible (except on Windows, for
some reason), so this commit is a workaround, to use a
QGraphicsVideoItem instead of a QVideoWidget while modifying the rest
of the class hierarchy as little as possible.
Ultimately, a cleaner solution (not making UBGraphicsMediaItem inherit
QGraphicsProxyWidget, for example) may be desirable.
- Removed commented out obsolete code that had been added
- Removed objects that were never used (mAudioOutput, audioFormat etc)
- Re-made changes that had been reverted since commit cdb5633
Long version:
UBGraphicsPolygonItem::shape() sometimes caused OpenBoard to crash due to
inifinite recursion. This is easily replicated by trying to use the
highlighting tool.
The reason is: shape() calls boundingRect(); this function's definition is:
QRectF QGraphicsPolygonItem::boundingRect() const
{
Q_D(const QGraphicsPolygonItem);
if (d->boundingRect.isNull()) {
qreal pw = pen().style() == Qt::NoPen ? qreal(0) : pen().widthF();
if (pw == 0.0)
d->boundingRect = d->polygon.boundingRect();
else
d->boundingRect = shape().controlPointRect();
}
return d->boundingRect;
}
In the case where pw != 0, the shape() function is called. However, it
is shape() from the derived class, not the base class, which is called.
In other words, UBGraphicsPolygonItem::shape() is called rather than
QGraphicsPolygonItem::shape().
This means that boundingRect() is called again from within shape(), and
so on, causing the program to crash.
The fix was simply to remove UBGraphicsPolygonItem::shape(), as it
appears to provide the same (or very similar) functionality to that of
the base class's shape() function.
In case this shape() function actually is needed, another workaround
should be implemented to prevent this infinite recursion.
Craig Watson
agriche
Claudio Valerio
Claudio Valerio
Nicolas Nenon
-f
Ilia Ryabokon