[openlp-dev] [OpenLP] QGraphicsView Renderer Concept

[Tomas Groth]

Hi Laura,

It was actually me who talked about it :-)
We are currently working on getting chords into OpenLP, and to do that we
use some CSS, which unfortunately is not supported by the Qt rich text
engine, we know because it breaks the printing-rendering of chords which
uses Qt rich text. The docs on the supported CSS is here:
http://doc.qt.io/qt-5/richtext-html-subset.html#css-properties
The formatting tags in OpenLP are also relying on HTML and CSS, but for
most cases I think the support in Qt rich text is sufficient.
The code for the chords is currently in this branch:
https://code.launchpad.net/~tomasgroth/openlp/chords - we (or me) hope to
merge it soon. If we switch to the new renderer we will have to
re-implement that somehow.

I think the new renderer looks good, but there are of course some
consideration about how it will measure up against our current all-html
approach. While a QGraphicsView based renderer could be the future of
OpenLP, I think we should stick to the webbased approach for the upcoming
2.6 release. A thing to note about the performance is that the QtWebEngine
that we plan to move to as renderer to replace the QtWebKit, should be
faster since it should use hardware acceleration. This is of course still
to be tested...

Best regards,
Tomas (tgc)



2016-12-03 21:10 GMT+01:00 Laura Ekstrand <laura at jlekstrand.net>:

> Tim Bentley was talking about using CSS to draw guitar chords (presumably
> for a confidence screen).  I'm not sure if this platform would accommodate
> that.  Could you elaborate on that idea?  Is there code for this I could
> look at?
>
> Thanks.
>
> Laura
>
> On Dec 3, 2016 11:21 AM, "Raoul Snyman" <raoul at snyman.info> wrote:
>
>> Hey Laura,
>>
>> As I said in the IRC channel, I'm really impressed with this. I think we
>> all would like to see if we can make something that contains all the
>> features of our current rendering engine, and then move onto the fancier
>> stuff like transitions.
>>
>>
>> --
>> Raoul Snyman
>> 082 550 3754
>> raoul at snyman.info
>> _______________________________________________
>> openlp-dev mailing list
>> openlp-dev at openlp.io
>> https://lists.openlp.io/mailman/listinfo/openlp-dev
>>
>
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