[Bug 786246] qmlglsink: Add itemInitialized signal

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786246

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ystreet00 at gmail.com

--- Comment #4 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> Is there no existing signal for this already that we could re-use? Seems
> like a common thing to want to get notified about.

I don't think so.  Performing these acrobatics is not something every
QQuickItem will need to do.

There is the windowChanged() signal that the item already uses internally to do
this exact setup depending on if the scene graph is initialized.
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/qt/qtitem.cc#n351

Requiring every user to implement similar logic isn't that user-friendly so an
extra signal is a good idea.

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