[Gtk2-perl-bugs] [Bug 591070] New: no support for GType/GParamGType

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  gnome-perl | Glib | Ver: unspecified
           Summary: no support for GType/GParamGType
           Product: gnome-perl
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Glib
        AssignedTo: gtk2-perl-bugs@...
        ReportedBy: ebassi@...
         QAContact: gtk2-perl-bugs@...
     GNOME version: 2.27/2.28
   GNOME milestone: Unspecified


currently, Glib does not support values and GParamSpec dealing with GType, thus
it's impossible to deal with object properties storing a GType.

rationale: Clutter has a class which stores an interval between two values,
ClutterInterval; it would be probably more Perl-ish to override the bindings
completely and write intervals as arrayrefs, but one of the nice bits of the
class is that it allows subclasses to override the interval progress using
their own progress function, e.g.:

  interval('boolean') = [ false, true ]
  compute(interval, progress=0.0) = false
  compute(interval, progress=0.2) = false
  compute(interval, progress=0.4) = false
  compute(interval, progress=0.6) = true
  compute(interval, progress=0.8) = true
  compute(interval, progress=1.0) = true

  myinterval('boolean') = [ false, true ]
  myinterval.threshold = 0.7
  compute(myinterval, progress=0.0) = false
  compute(myinterval, progress=0.2) = false
  compute(myinterval, progress=0.4) = false
  compute(myinterval, progress=0.6) = false
  compute(myinterval, progress=0.8) = true
  compute(myinterval, progress=1.0) = true

the type of the value of the interval is stored as a :value-type property in
the C class, declared with g_param_spec_gtype(), since we allow interpolating
the progress even between boxed types (e.g. colors or geometries).

if I try to subclass ClutterInterval from Perl, and pass any value to the
:value-type property at construction time, Perl, Glib and GLib will get *very*
angry at me.


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  gnome-perl | Glib | Ver: unspecified




------- Comment #1 from Emmanuele Bassi  2009-08-07 16:16 UTC -------
Created an attachment (id=140129)
 --> (http://bugzilla.gnome.org/attachment.cgi?id=140129&action=view)
Support GTypes in values and properties

Currently, Glib is missing support for declaring Object properties
storing GType (as package names), and for setting/getting those
properties.

The implementation of GParamSpecGType is pretty trivial, requiring
only the registration of the GParamSpec and some glue for constructor
and accessor to its only public member.

The implementation of GValue support for GType is slightly more
"interesting", since GType is *not* a fundamental type (like one
would expect) but a sub-type of G_TYPE_POINTER.

Fixes bug:


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  gnome-perl | Glib | Ver: unspecified

Emmanuel Rodriguez changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |591166
              nThis|                            |




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