## GladePropertyClass

GladePropertyClass — Property Class-wide metadata.

## Synopsis

    #define             GPC_OBJECT_DELIMITER
    #define             GPC_PROPERTY_NAMELEN
                        GladePropertyClass;
    GladePropertyClass * glade_property_class_new           (gpointer handle);
    GladePropertyClass * glade_property_class_new_from_spec (gpointer handle,
                                                             GParamSpec *spec);
    GladePropertyClass * glade_property_class_clone         (GladePropertyClass *property_class);
    void                glade_property_class_free           (GladePropertyClass *property_class);
    gboolean            glade_property_class_is_visible     (GladePropertyClass *property_class);
    gboolean            glade_property_class_is_object      (GladePropertyClass *property_class,
                                                             GladeProjectFormat fmt);
    GValue *            glade_property_class_make_gvalue_from_string
                                                            (GladePropertyClass *property_class,
                                                             const gchar *string,
                                                             GladeProject *project,
                                                             GladeWidget *widget);
    gchar *             glade_property_class_make_string_from_gvalue
                                                            (GladePropertyClass *property_class,
                                                             const GValue *value,
                                                             GladeProjectFormat fmt);
    GValue *            glade_property_class_make_gvalue_from_vl
                                                            (GladePropertyClass *property_class,
                                                             va_list vl);
    void                glade_property_class_set_vl_from_gvalue
                                                            (GladePropertyClass *klass,
                                                             GValue *value,
                                                             va_list vl);
    GValue *            glade_property_class_make_gvalue    (GladePropertyClass *klass,
                                                             ...);
    void                glade_property_class_get_from_gvalue
                                                            (GladePropertyClass *klass,
                                                             GValue *value,
                                                             ...);
    gboolean            glade_property_class_update_from_node
                                                            (GladeXmlNode *node,
                                                             GModule *module,
                                                             GType object_type,
                                                             GladePropertyClass **property_class,
                                                             const gchar *domain);
    GtkAdjustment *     glade_property_class_make_adjustment
                                                            (GladePropertyClass *property_class);
    gboolean            glade_property_class_match          (GladePropertyClass *klass,
                                                             GladePropertyClass *comp);
    gboolean            glade_property_class_void_value     (GladePropertyClass *klass,
                                                             GValue *value);

## Description

GladePropertyClass is a structure based on a GParamSpec and parameters from the Glade catalog files and describes how properties are to be handled in Glade; it also provides an interface to convert GValue to strings and va_lists etc (back and forth).

## Details

### GPC_OBJECT_DELIMITER

    #define GPC_OBJECT_DELIMITER ", "

### GPC_PROPERTY_NAMELEN

    #define GPC_PROPERTY_NAMELEN 512  /* Enough space for a property name I think */

### GladePropertyClass

    typedef struct {
    	gpointer    handle; /* The GladeWidgetAdaptor that this property class
    			     * was created for.
    			     */

    	guint16     version_since_major; /* Version in which this property was */
    	guint16     version_since_minor; /* introduced.                       */

    	guint16     builder_since_major; /* Version in which this property became */
    	guint16     builder_since_minor; /* available in GtkBuilder format        */

    	GParamSpec *pspec; /* The Parameter Specification for this property.
    			    */

    	gchar *id;       /* The id of the property. Like "label" or "xpad"
    			  * this is a non-translatable string
    			  */

    	gchar *name;     /* The name of the property. Like "Label" or "X Pad"
    			  * this is a translatable string
    			  */

    	gchar *tooltip; /* The default tooltip for the property editor rows.
    			 */

    	GValue *def;      /* The default value for this property (this will exist
    			   * as a copy of orig_def if not specified by the catalog)
    			   */

    	GValue *orig_def; /* The real default value obtained through introspection.
    			   * (used to decide whether we should write to the
    			   * glade file or not, or to restore the loaded property
    			   * correctly); all property classes have and orig_def.
    			   */

    	GList *parameters; /* list of GladeParameter objects. This list
    			    * provides with an extra set of key-value
    			    * pairs to specify aspects of this property.
    			    *
    			    * This is unused by glade and only maintained
    			    * to be of possible use in plugin code.
    			    */

    	gint  visible_lines; /* When this pspec calls for a text editor, how many
    			      * lines should be visible in the editor.
    			      */

    	/* For catalogs that support libglade: */
    	guint    libglade_only : 1;       /* Mark special libglade virtual properties */
    	guint    libglade_unsupported : 1;/* Mark properties that are not available in libglade */

    	guint virt : 1; /* Whether this is a virtual property with its pspec supplied
    			 * via the catalog (or hard code-paths); or FALSE if its a real
    			 * GObject introspected property
    			 */

    	guint optional : 1; /* Some properties are optional by nature like
    			     * default width. It can be set or not set. A
    			     * default property has a check box in the
    			     * left that enables/disables the input
    			     */

    	guint optional_default : 1; /* For optional values, what the default is */

    	guint construct_only : 1; /* Whether this property is G_PARAM_CONSTRUCT_ONLY or not */

    	guint common : 1;  /* Common properties go in the common tab */
    	guint atk : 1;     /* Atk properties go in the atk tab */
    	guint packing : 1; /* Packing properties go in the packing tab */
    	guint query : 1;   /* Whether we should explicitly ask the user about this property
    			    * when instantiating a widget with this property (through a popup
    			    * dialog).
    			    */

    	guint translatable : 1; /* The property should be translatable, which
    				 * means that it needs extra parameters in the
    				 * UI.
    				 */

    	/* These three are the master switches for the glade-file output,
    	 * property editor availability & live object updates in the glade environment.
    	 */
    	guint save : 1;      /* Whether we should save to the glade file or not
    			      * (mostly just for virtual internal glade properties,
    			      * also used for properties with generic pspecs that
    			      * are saved in custom ways by the plugin)
    			      */
    	guint save_always : 1; /* Used to make a special case exception and always
    				* save this property regardless of what the default
    				* value is (used for some special cases like properties
    				* that are assigned initial values in composite widgets
    				* or derived widget code).
    				*/
    	guint visible : 1;   /* Whether or not to show this property in the editor &
    			      * reset dialog.
    			      */

    	guint custom_layout : 1; /* Properties marked as custom_layout will not be included
    				  * in a base #GladeEditorTable implementation (use this
    				  * for properties you want to layout in custom ways in
    				  * a #GladeEditable widget
    				  */

    	guint ignore : 1;    /* When true, we will not sync the object when the property
    			      * changes, or load values from the object.
    			      */

    	guint needs_sync : 1; /* Virtual properties need to be synchronized after object
    			       * creation, some properties that are not virtual also need
    			       * handling from the backend, if "needs-sync" is true then
    			       * this property will by synced with virtual properties.
    			       */

    	guint is_modified : 1; /* If true, this property_class has been "modified" from the
    				* the standard property by a xml file. */

    	guint themed_icon : 1; /* Some GParamSpecString properties reffer to icon names
    				* in the icon theme... these need to be specified in the
    				* property class definition if proper editing tools are to
    				* be used.
    				*/
    	guint stock_icon : 1; /* String properties can also denote stock icons, including
    			       * icons from icon factories...
    			       */
    	guint stock : 1;      /* ... or a narrower list of "items" from gtk builtin stock items.
    			       */

    	guint transfer_on_paste : 1; /* If this is a packing prop,
    				      * wether we should transfer it on paste.
    				      */

    	guint parentless_widget : 1;  /* True if this property should point to a parentless widget
    				       * in the project
    				       */

    	gdouble weight; /* This will determine the position of this property in
    			 * the editor.
    			 */

    	gchar *create_type; /* If this is an object property and you want the option to create
    			     * one from the object selection dialog, then set the name of the
    			     * concrete type here.
    			     */
    } GladePropertyClass;

### glade_property_class_new ()

    GladePropertyClass * glade_property_class_new           (gpointer handle);

`handle` : | A generic pointer (i.e. a GladeWidgetClass)
Returns : | a new GladePropertyClass

### glade_property_class_new_from_spec ()

    GladePropertyClass * glade_property_class_new_from_spec (gpointer handle,
                                                             GParamSpec *spec);

`handle` : | A generic pointer (i.e. a GladeWidgetClass)
`spec` : | A GParamSpec
Returns : | a newly created GladePropertyClass based on `spec` or `NULL` if its unsupported.

### glade_property_class_clone ()

    GladePropertyClass * glade_property_class_clone         (GladePropertyClass *property_class);

`property_class` : | a GladePropertyClass
Returns : | a new GladePropertyClass cloned from `property_class`

### glade_property_class_free ()

    void                glade_property_class_free           (GladePropertyClass *property_class);

Frees `klass` and its associated memory.

`property_class` : | a GladePropertyClass

### glade_property_class_is_visible ()

    gboolean            glade_property_class_is_visible     (GladePropertyClass *property_class);

`property_class` : | A GladePropertyClass
Returns : | whether or not to show this property in the editor

### glade_property_class_is_object ()

    gboolean            glade_property_class_is_object      (GladePropertyClass *property_class,
                                                             GladeProjectFormat fmt);

`property_class` : | A GladePropertyClass
`fmt` : | the GladeProjectFormat
Returns : | whether or not this is an object property that refers to another object in this project.

### glade_property_class_make_gvalue_from_string ()

    GValue *            glade_property_class_make_gvalue_from_string
                                                            (GladePropertyClass *property_class,
                                                             const gchar *string,
                                                             GladeProject *project,
                                                             GladeWidget *widget);

`property_class` : | A GladePropertyClass
`string` : | a string representation of this property
`widget` : | the GladeWidget that the associated property belongs to.
Returns : | A GValue created based on the `property_class` and `string` criteria.

### glade_property_class_make_string_from_gvalue ()

    gchar *             glade_property_class_make_string_from_gvalue
                                                            (GladePropertyClass *property_class,
                                                             const GValue *value,
                                                             GladeProjectFormat fmt);

`property_class` : | A GladePropertyClass
`value` : | A GValue
`fmt` : | The GladeProjectFormat the string should conform to
Returns : | A newly allocated string representation of `value`

### glade_property_class_make_gvalue_from_vl ()

    GValue *            glade_property_class_make_gvalue_from_vl
                                                            (GladePropertyClass *property_class,
                                                             va_list vl);

`property_class` : | A GladePropertyClass
`vl` : | a va_list holding one argument of the correct type specified by `property_class`
Returns : | A GValue created based on the `property_class` and a `vl` arg of the correct type.

### glade_property_class_set_vl_from_gvalue ()

    void                glade_property_class_set_vl_from_gvalue
                                                            (GladePropertyClass *klass,
                                                             GValue *value,
                                                             va_list vl);

Sets `vl` from `value` based on `klass` criteria.

`klass` : | A GladePropertyClass
`value` : | A GValue to set
`vl` : | a va_list holding one argument of the correct type specified by `klass`

### glade_property_class_make_gvalue ()

    GValue *            glade_property_class_make_gvalue    (GladePropertyClass *klass,
                                                             ...);

`klass` : | A GladePropertyClass
`...` : | an argument of the correct type specified by `property_class`
Returns : | A GValue created based on the `property_class` and the provided argument.

### glade_property_class_get_from_gvalue ()

    void                glade_property_class_get_from_gvalue
                                                            (GladePropertyClass *klass,
                                                             GValue *value,
                                                             ...);

Assignes the provided return location to `value`

`klass` : | A GladePropertyClass
`value` : | A GValue to set
`...` : | a return location of the correct type

### glade_property_class_update_from_node ()

    gboolean            glade_property_class_update_from_node
                                                            (GladeXmlNode *node,
                                                             GModule *module,
                                                             GType object_type,
                                                             GladePropertyClass **property_class,
                                                             const gchar *domain);

Updates the `property_class` with the contents of the node in the xml file. Only the values found in the xml file are overridden.

`node` : | the property node
`module` : | a GModule to lookup symbols from the plugin
`object_type` : | the GType of the owning object
`property_class` : | a pointer to the property class
`domain` : | the domain to translate catalog strings from
Returns : | `TRUE` on success. `property_class` is set to NULL if the property has Disabled="TRUE".

### glade_property_class_make_adjustment ()

    GtkAdjustment *     glade_property_class_make_adjustment
                                                            (GladePropertyClass *property_class);

Creates and appropriate GtkAdjustment for use in the editor

`property_class` : | a pointer to the property class
Returns : | An appropriate GtkAdjustment for use in the Property editor

### glade_property_class_match ()

    gboolean            glade_property_class_match          (GladePropertyClass *klass,
                                                             GladePropertyClass *comp);

`klass` : | a GladePropertyClass
`comp` : | a GladePropertyClass
Returns : | whether `klass` and `comp` are a match or not (properties in seperate decendant heirarchies that have the same name are not matches).

### glade_property_class_void_value ()

    gboolean            glade_property_class_void_value     (GladePropertyClass *klass,
                                                             GValue *value);

`klass` : | a GladePropertyClass
Returns : | Whether `value` for this `klass` is voided; a voided value can be a `NULL` value for boxed or object type param specs.