Am Montag, den 10.07.2006, 12:45 -0300 schrieb Daniel Alonso:
> Hi, I'm trying to define a gobject class with a floating number
> property. In the init class procedure I define the property the
> following way:
>
> param_spec = g_param_spec_float
> ("width" /* name */,
> _("Icon Width") /* nick */,
> _("The width of the svg icon") /* blurb */,
> G_MINFLOAT /* minimum */,
> G_MAXFLOAT /* maximum */,
> 0.0 /* default_value */,
> (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE));
> g_object_class_install_property (g_object_class,
> PROP_WIDTH,
> param_spec);
>
> This compiles fine, but when running the test program it raises a glib
> exception:
>
> (test:5073): GLib-GObject-CRITICAL **: g_param_spec_float: assertion
> `default_value >= minimum && default_value <= maximum' failed
>
> (test:5073): GLib-GObject-CRITICAL **: g_object_class_install_property:
> assertion `G_IS_PARAM_SPEC (pspec)' failed
>
> But default value 0.0 is equal G_MINFLOAT and lesser than G_MAXFLOAT,
> isn't it?
>From the API docs [1]:
"The minimum positive value which can be held in a gfloat.
If you are interested in the smallest value which can be held in a
gfloat, use -G_MAX_FLOAT."
0.0 is not considered positive in this case, I think it works like:
G_MINFLOAT is the smalles floating number f that satisfies f > 0.
Since icons may only have a positive width, 1.0 might be a good default
value.
[1]
http://developer.gnome.org/doc/API/2.0/glib/glib-Limits-of-Basic-Types.html#G-MINFLOAT:CAPS";
--
Christian Neumair <[EMAIL PROTECTED]>
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