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A #GParamSpec derived structure that contains the meta data for float properties.





default_value: number

default value for the property specified

epsilon: number

values closer than epsilon will be considered identical by g_param_values_cmp(); the default value is 1e-30.


#GParamFlags flags for this parameter

g_type_instance: TypeInstance

private #GTypeInstance portion

maximum: number

maximum value for the property specified

minimum: number

minimum value for the property specified

name: string

name of this parameter: always an interned string

owner_type: GType<unknown>

#GType type that uses (introduces) this parameter

parent_instance: ParamSpec

private #GParamSpec portion

value_type: GType<unknown>

the #GValue type for this parameter

name: string


  • get_blurb(): string
  • get_default_value(): any
  • get_name(): string
  • get_name_quark(): number
  • get_nick(): string
  • get_qdata(quark: number): object
  • If the paramspec redirects operations to another paramspec, returns that paramspec. Redirect is used typically for providing a new implementation of a property in a derived type while preserving all the properties from the parent type. Redirection is established by creating a property of type #GParamSpecOverride. See g_object_class_override_property() for an example of the use of this capability.

    Returns ParamSpec

  • set_qdata(quark: number, data: object): void
  • Sets an opaque, named pointer on a #GParamSpec. The name is specified through a #GQuark (retrieved e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the pspec with g_param_spec_get_qdata(). Setting a previously set user data pointer, overrides (frees) the old pointer set, using %NULL as pointer essentially removes the data stored.


    • quark: number

      a #GQuark, naming the user data pointer

    • data: object

      an opaque user data pointer

    Returns void

  • sink(): void
  • The initial reference count of a newly created #GParamSpec is 1, even though no one has explicitly called g_param_spec_ref() on it yet. So the initial reference count is flagged as "floating", until someone calls g_param_spec_ref (pspec); g_param_spec_sink (pspec); in sequence on it, taking over the initial reference count (thus ending up with a pspec that has a reference count of 1 still, but is not flagged "floating" anymore).

    Returns void

  • steal_qdata(quark: number): object
  • Gets back user data pointers stored via g_param_spec_set_qdata() and removes the data from pspec without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier.


    • quark: number

      a #GQuark, naming the user data pointer

    Returns object

  • vfunc_finalize(): void
  • vfunc_value_set_default(value: any): void
  • vfunc_value_validate(value: any): boolean
  • vfunc_values_cmp(value1: any, value2: any): number
  • is_valid_name(name: string): boolean
  • Validate a property name for a #GParamSpec. This can be useful for dynamically-generated properties which need to be validated at run-time before actually trying to create them.

    See [canonical parameter names][canonical-parameter-names] for details of the rules for valid names.


    • name: string

      the canonical name of the property

    Returns boolean


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