KWin and Qt5

[Alexis Ménard]

Hi,

There are big differences between QGPW and QWidget sitting on top of
the scene graph.

QPW we needed to :

- Convert all events from a QWidget (QGV) to QGS then back to QWidget.
- Hook up the painting code from one QPainter to the paintEvent of QWidget.

QGV was a framework sitting on top of another one (QWidget) trying to
integrate again with the one it's sitting on.

The way I see the QWidget integration with scene graph is WAY more simple :

- No event redirections/machinery (this is managed by Lighthouse already).
- All drawing calls made on QPainter goes to the scene graph.

Not sure they will redo the backing store related stuff. It will be
most probably not fast but good enough for desktop usage and as a
legacy framework.

So I believe it's WAY less cave-heats than QGP.

On Mon, May 9, 2011 at 6:41 PM, Marco Martin <notmart at gmail.com> wrote:
> On Monday 09 May 2011, Aaron J. Seigo wrote:
>> On Monday, May 9, 2011 19:38:28 Marco Martin wrote:
>> > On Monday 09 May 2011, Martin Gräßlin wrote:
>> > > Hi all,
>> > >
>> > > yes it's early, but there was something in Lars's blog post [1] which I
>> > > need to braindump/discuss. Let me quote the important part: "Qt will
>> > > require OpenGL (ES) 2.0 to work. QWidgets will be layered on top of the
>> > > scene graph (not the scene graph on top of QWidgets as is currently
>> > > done with Qt 4)."
>> >
>> > this sounds to me as qgraphicsproxywidgets pain all over again and i
>> > really
>>
>> the one ray of hope i have is that QGraphicsProxyWidget had to work with
>> QWidget as it was. in Qt5, there is the opportunity to break ABI and allow
>> this to be done Properly(tm) by making necessary changes in QWidget itself.
>>
>> we need to get involved early :)
>
> indeed.
> and this influences the design of plasma2 quite a bit as well
> (we could be forced to eat the cake, even if a lie ;)
>
> --
> Marco Martin
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