After completing the self-contained UICoord data elements,
the next thing to consider might be how to resolve UI coordinates
against an actual window topology. We need to define a suitable
command-and-query interface in order to build and verify this
intricate resolution process separated from the actual UI code.
exploring the idea of a configuration DSL.
As a first step, this could be a simple internal DSL,
implemented as a bunch of static functor objects, which are internally bound
and thus implemented by the ViewLocator within InteractionDirector
...we have to face the problem that we need some generic strategy
for access to component views, which possibly will become customisable.
And the allowed patterns of access are quite different for the various
kind of view we know....
responsible for access and allocation of component views.
Internally wired to the PanelLocator within the global WindowLocator
This setup settles those nasty qeustions of crosswise top-level access
this starts work on a new UI global topic (#1004)
- coin a new term: "view component"
- distinction between veiw component and Panel
- consider how to locate view components
- WindowList becomes WindowLocator
actually I do not know much regarding the actual situation when,
within the Builder run, we're able to detect a change and generate
a diff description. However, as a first step, I'll pick IterSrouce
as a base interface and use a "generation context", which is to be
passed by shared-ptr
the (trivial) implementation turned out to be correct as written,
but it was (again) damn challenging to get the mulithreaded chaotic
test fixture and especially the lambda captures to work correct.
- concept for a first preliminary implementation of dispatch into the UI thread
- define an integration effort to build a complete working communication chain
This change was caused by investigation of UI event loop dispatch;
since the GTK UI is designed to run single threaded, any invocation
from other threads need to be diepatched explicitly.
A possible way to achieve this is to use Glib::Dispatcher, which
in turn requires that the current thread (which is in this case the UI thread)
already holds a Glib::MainContext
This prompted me to create a tight link between the external facade interfaces
of the UI and the event loop itself. What remains to be settled is how
to hand over arguments to the action in the main loop
After investigation of current GTK and GIO code, I came to the conclusion
that we do *not* want to rely on the shiny new Gtk::Application, which
provides a lot of additional "convenience" functionality we do neither
need nor want. Most notably, we do not want extended desktop integration
like automatically connecting to D-Bus or exposing application actions
as desktop events.
After stripping away all those optional functions and extensions, it turns
out the basic code to operate the GTK main event loop is quite simple.
This changeset extracts this code from the (deprecated) Gtk::Main and
integrates it directly in Lumiera's UI framework object (UiManager).
this is just a tiny change to make things more othogonal.
Now the unwinding and calls to any GTK / Widget dtors happen *after*
emitting the term signal from UI shutdown. Which means, the other subsystems
are shutting down (in their dedicated threads) as well, thus lowering
the probability of some action still using the UI and triggering an exception
as it turned out, the former functionality was deactivated in 2009
with changeset 6151415
The whole concept seems to be unfinished, and needs to be reworked
and integrated with "Views and Perspectives" (whatever that is...)
See also #1097
Gtk::Main is deprecated, but the new solution, instantiating a
Gtk::Application object does not match our use case, since we handle
all application concerns already and just need a Gtk main loop to run.
Anyway, it became clear that the "main object" will be the new UiManager.
As a first step, I've now moved the (deprecated) Gtk::Main object
down there. Next step (planned) will be to inherit from Gio::Application
and clone some functionality from Gtk::Application
