[ NoWrapper ]
public abstract bool custom_tag_start (Builder builder, Object? child, string tagname, out BuildableParser parser, out void* data)
Called for each unknown element under `<child>`.
| this |
a `GtkBuildable` |
| builder |
a `GtkBuilder` used to construct this object |
| child |
child object or null for non-child tags |
| tagname |
name of tag |
| parser |
a `GtkBuildableParser` to fill in |
| data |
return location for user data that will be passed in to parser functions |
|
true if an object has a custom implementation, false if it doesn't. |