## GimpWidgets GimpWidgets — A collection of convenient widget constructors, standard callbacks and helper functions. |

## Synopsis

    GtkWidget*          gimp_radio_group_new                (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             ...);
    GtkWidget*          gimp_radio_group_new2               (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             GCallback radio_button_callback,
                                                             gpointer radio_button_callback_data,
                                                             gpointer initial,
                                                             ...);
    void                gimp_radio_group_set_active         (GtkRadioButton *radio_button,
                                                             gpointer item_data);
    GtkWidget*          gimp_int_radio_group_new            (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             GCallback radio_button_callback,
                                                             gpointer radio_button_callback_data,
                                                             gint initial,
                                                             ...);
    void                gimp_int_radio_group_set_active     (GtkRadioButton *radio_button,
                                                             gint item_data);
    GtkWidget*          gimp_spin_button_new                (GtkObject **adjustment,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             gdouble page_size,
                                                             gdouble climb_rate,
                                                             guint digits);
    #define             GIMP_SCALE_ENTRY_LABEL              (adj)
    #define             GIMP_SCALE_ENTRY_SCALE              (adj)
    #define             GIMP_SCALE_ENTRY_SCALE_ADJ          (adj)
    #define             GIMP_SCALE_ENTRY_SPINBUTTON         (adj)
    #define             GIMP_SCALE_ENTRY_SPINBUTTON_ADJ     (adj)
    GtkObject*          gimp_scale_entry_new                (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *text,
                                                             gint scale_width,
                                                             gint spinbutton_width,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             guint digits,
                                                             gboolean constrain,
                                                             gdouble unconstrained_lower,
                                                             gdouble unconstrained_upper,
                                                             const gchar *tooltip,
                                                             const gchar *help_id);
    void                gimp_scale_entry_set_sensitive      (GtkObject *adjustment,
                                                             gboolean sensitive);
    void                gimp_scale_entry_set_logarithmic    (GtkObject *adjustment,
                                                             gboolean logarithmic);
    gboolean            gimp_scale_entry_get_logarithmic    (GtkObject *adjustment);
    GtkObject*          gimp_color_scale_entry_new          (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *text,
                                                             gint scale_width,
                                                             gint spinbutton_width,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             guint digits,
                                                             const gchar *tooltip,
                                                             const gchar *help_id);
    #define             GIMP_RANDOM_SEED_SPINBUTTON         (hbox)
    #define             GIMP_RANDOM_SEED_SPINBUTTON_ADJ     (hbox)
    #define             GIMP_RANDOM_SEED_TOGGLE             (hbox)
    GtkWidget*          gimp_random_seed_new                (guint32 *seed,
                                                             gboolean *random_seed);
    #define             GIMP_COORDINATES_CHAINBUTTON        (sizeentry)
    GtkWidget*          gimp_coordinates_new                (GimpUnit unit,
                                                             const gchar *unit_format,
                                                             gboolean menu_show_pixels,
                                                             gboolean menu_show_percent,
                                                             gint spinbutton_width,
                                                             GimpSizeEntryUpdatePolicy update_policy,
                                                             gboolean chainbutton_active,
                                                             gboolean chain_constrains_ratio,
                                                             const gchar *xlabel,
                                                             gdouble x,
                                                             gdouble xres,
                                                             gdouble lower_boundary_x,
                                                             gdouble upper_boundary_x,
                                                             gdouble xsize_0,
                                                             gdouble xsize_100,
                                                             const gchar *ylabel,
                                                             gdouble y,
                                                             gdouble yres,
                                                             gdouble lower_boundary_y,
                                                             gdouble upper_boundary_y,
                                                             gdouble ysize_0,
                                                             gdouble ysize_100);
    GtkWidget*          gimp_pixmap_button_new              (gchar **xpm_data,
                                                             const gchar *text);
    void                gimp_toggle_button_sensitive_update (GtkToggleButton *toggle_button);
    void                gimp_toggle_button_update           (GtkWidget *widget,
                                                             gpointer data);
    void                gimp_radio_button_update            (GtkWidget *widget,
                                                             gpointer data);
    void                gimp_int_adjustment_update          (GtkAdjustment *adjustment,
                                                             gpointer data);
    void                gimp_uint_adjustment_update         (GtkAdjustment *adjustment,
                                                             gpointer data);
    void                gimp_float_adjustment_update        (GtkAdjustment *adjustment,
                                                             gpointer data);
    void                gimp_double_adjustment_update       (GtkAdjustment *adjustment,
                                                             gpointer data);
    void                gimp_unit_menu_update               (GtkWidget *widget,
                                                             gpointer data);
    GtkWidget*          gimp_table_attach_aligned           (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *label_text,
                                                             gfloat xalign,
                                                             gfloat yalign,
                                                             GtkWidget *widget,
                                                             gint colspan,
                                                             gboolean left_align);
    void                gimp_label_set_attributes           (GtkLabel *label,
                                                             ...);

## Description

## Details

### gimp_radio_group_new ()

    GtkWidget*          gimp_radio_group_new                (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             ...);

Convenience function to create a group of radio buttons embedded into a GtkFrame or GtkVbox.

`in_frame` : | `TRUE` if you want a GtkFrame around the radio button group.
`frame_title` : | The title of the Frame or `NULL` if you don't want a title.
`...` : | A `NULL`-terminated `va_list` describing the radio buttons.
Returns : | A GtkFrame or GtkVbox (depending on `in_frame`).

### gimp_radio_group_new2 ()

    GtkWidget*          gimp_radio_group_new2               (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             GCallback radio_button_callback,
                                                             gpointer radio_button_callback_data,
                                                             gpointer initial,
                                                             ...);

Convenience function to create a group of radio buttons embedded into a GtkFrame or GtkVbox.

`in_frame` : | `TRUE` if you want a GtkFrame around the radio button group.
`frame_title` : | The title of the Frame or `NULL` if you don't want a title.
`radio_button_callback` : | The callback each button's "toggled" signal will be connected with.
`radio_button_callback_data` : | The data which will be passed to `g_signal_connect()`.
`initial` : | The `item_data` of the initially pressed radio button.
`...` : | A `NULL`-terminated `va_list` describing the radio buttons.
Returns : | A GtkFrame or GtkVbox (depending on `in_frame`).

### gimp_radio_group_set_active ()

    void                gimp_radio_group_set_active         (GtkRadioButton *radio_button,
                                                             gpointer item_data);

Calls `gtk_toggle_button_set_active()` with the radio button that was created with a matching `item_data`.

`radio_button` : | Pointer to a GtkRadioButton.
`item_data` : | The `item_data` of the radio button you want to select.

### gimp_int_radio_group_new ()

    GtkWidget*          gimp_int_radio_group_new            (gboolean in_frame,
                                                             const gchar *frame_title,
                                                             GCallback radio_button_callback,
                                                             gpointer radio_button_callback_data,
                                                             gint initial,
                                                             ...);

Convenience function to create a group of radio buttons embedded into a GtkFrame or GtkVbox. This function does the same thing as `gimp_radio_group_new2()`, but it takes integers as `item_data` instead of pointers, since that is a very common case (mapping an enum to a radio group).

`in_frame` : | `TRUE` if you want a GtkFrame around the radio button group.
`frame_title` : | The title of the Frame or `NULL` if you don't want a title.
`radio_button_callback` : | The callback each button's "toggled" signal will be connected with.
`radio_button_callback_data` : | The data which will be passed to `g_signal_connect()`.
`initial` : | The `item_data` of the initially pressed radio button.
`...` : | A `NULL`-terminated `va_list` describing the radio buttons.
Returns : | A GtkFrame or GtkVbox (depending on `in_frame`).

### gimp_int_radio_group_set_active ()

    void                gimp_int_radio_group_set_active     (GtkRadioButton *radio_button,
                                                             gint item_data);

Calls `gtk_toggle_button_set_active()` with the radio button that was created with a matching `item_data`. This function does the same thing as `gimp_radio_group_set_active()`, but takes integers as `item_data` instead of pointers.

`radio_button` : | Pointer to a GtkRadioButton.
`item_data` : | The `item_data` of the radio button you want to select.

### gimp_spin_button_new ()

    GtkWidget*          gimp_spin_button_new                (GtkObject **adjustment,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             gdouble page_size,
                                                             gdouble climb_rate,
                                                             guint digits);

This function is a shortcut for `gtk_adjustment_new()` and a subsequent `gtk_spin_button_new()` and does some more initialisation stuff like setting a standard minimum horizontal size.

`adjustment` : | Returns the spinbutton's GtkAdjustment.
`value` : | The initial value of the spinbutton.
`lower` : | The lower boundary.
`upper` : | The uppper boundary.
`step_increment` : | The spinbutton's step increment.
`page_increment` : | The spinbutton's page increment (mouse button 2).
`page_size` : | The spinbutton's page size.
`climb_rate` : | The spinbutton's climb rate.
`digits` : | The spinbutton's number of decimal digits.
Returns : | A GtkSpinbutton and it's GtkAdjustment.

### GIMP_SCALE_ENTRY_LABEL()

    #define             GIMP_SCALE_ENTRY_LABEL(adj)

Returns the scale_entry's GtkLabel.

`adj` : | The GtkAdjustment returned by `gimp_scale_entry_new()`.

### GIMP_SCALE_ENTRY_SCALE()

    #define             GIMP_SCALE_ENTRY_SCALE(adj)

Returns the scale_entry's GtkHScale.

`adj` : | The GtkAdjustment returned by `gimp_scale_entry_new()`.

### GIMP_SCALE_ENTRY_SCALE_ADJ()

    #define             GIMP_SCALE_ENTRY_SCALE_ADJ(adj)

Returns the GtkAdjustment of the scale_entry's GtkHScale.

`adj` : | The GtkAdjustment returned by `gimp_scale_entry_new()`.

### GIMP_SCALE_ENTRY_SPINBUTTON()

    #define             GIMP_SCALE_ENTRY_SPINBUTTON(adj)

Returns the scale_entry's GtkSpinButton.

`adj` : | The GtkAdjustment returned by `gimp_scale_entry_new()`.

### GIMP_SCALE_ENTRY_SPINBUTTON_ADJ()

    #define             GIMP_SCALE_ENTRY_SPINBUTTON_ADJ(adj)

Returns the GtkAdjustment of the scale_entry's GtkSpinButton.

`adj` : | The GtkAdjustment returned by `gimp_scale_entry_new()`.

### gimp_scale_entry_new ()

    GtkObject*          gimp_scale_entry_new                (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *text,
                                                             gint scale_width,
                                                             gint spinbutton_width,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             guint digits,
                                                             gboolean constrain,
                                                             gdouble unconstrained_lower,
                                                             gdouble unconstrained_upper,
                                                             const gchar *tooltip,
                                                             const gchar *help_id);

This function creates a GtkLabel, a GtkHScale and a GtkSpinButton and attaches them to a 3-column GtkTable.

`table` : | The GtkTable the widgets will be attached to.
`column` : | The column to start with.
`row` : | The row to attach the widgets.
`text` : | The text for the GtkLabel which will appear left of the GtkHScale.
`scale_width` : | The minimum horizontal size of the GtkHScale.
`spinbutton_width` : | The minimum horizontal size of the GtkSpinButton.
`value` : | The initial value.
`lower` : | The lower boundary.
`upper` : | The upper boundary.
`step_increment` : | The step increment.
`page_increment` : | The page increment.
`digits` : | The number of decimal digits.
`constrain` : | `TRUE` if the range of possible values of the GtkSpinButton should be the same as of the GtkHScale.
`unconstrained_lower` : | The spinbutton's lower boundary if `constrain` == `FALSE`.
`unconstrained_upper` : | The spinbutton's upper boundary if `constrain` == `FALSE`.
`tooltip` : | A tooltip message for the scale and the spinbutton.
`help_id` : | The widgets' help_id (see `gimp_help_set_help_data()`).
Returns : | The GtkSpinButton's GtkAdjustment.

### gimp_scale_entry_set_sensitive ()

    void                gimp_scale_entry_set_sensitive      (GtkObject *adjustment,
                                                             gboolean sensitive);

Sets the sensitivity of the scale_entry's GtkLabel, GtkHScale and GtkSpinbutton.

`adjustment` : | a GtkAdjustment returned by `gimp_scale_entry_new()`
`sensitive` : | a boolean value with the same semantics as the `sensitive` parameter of `gtk_widget_set_sensitive()`

### gimp_scale_entry_set_logarithmic ()

    void                gimp_scale_entry_set_logarithmic    (GtkObject *adjustment,
                                                             gboolean logarithmic);

Sets whether the scale_entry's scale widget will behave in a linear or logharithmic fashion. Useful when an entry has to attend large ranges, but smaller selections on that range require a finer adjustment.

`adjustment` : | a GtkAdjustment as returned by `gimp_scale_entry_new()`
`logarithmic` : | a boolean value to set or reset logarithmic behaviour of the scale widget

Since GIMP 2.2

### gimp_scale_entry_get_logarithmic ()

    gboolean            gimp_scale_entry_get_logarithmic    (GtkObject *adjustment);

`adjustment` : | a GtkAdjustment as returned by `gimp_scale_entry_new()`
Returns : | `TRUE` if the the entry's scale widget will behave in logharithmic fashion, `FALSE` for linear behaviour.

Since GIMP 2.2

### gimp_color_scale_entry_new ()

    GtkObject*          gimp_color_scale_entry_new          (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *text,
                                                             gint scale_width,
                                                             gint spinbutton_width,
                                                             gdouble value,
                                                             gdouble lower,
                                                             gdouble upper,
                                                             gdouble step_increment,
                                                             gdouble page_increment,
                                                             guint digits,
                                                             const gchar *tooltip,
                                                             const gchar *help_id);

This function creates a GtkLabel, a GimpColorScale and a GtkSpinButton and attaches them to a 3-column GtkTable.

`table` : | The GtkTable the widgets will be attached to.
`column` : | The column to start with.
`row` : | The row to attach the widgets.
`text` : | The text for the GtkLabel which will appear left of the GtkHScale.
`scale_width` : | The minimum horizontal size of the GtkHScale.
`spinbutton_width` : | The minimum horizontal size of the GtkSpinButton.
`value` : | The initial value.
`lower` : | The lower boundary.
`upper` : | The upper boundary.
`step_increment` : | The step increment.
`page_increment` : | The page increment.
`digits` : | The number of decimal digits.
`tooltip` : | A tooltip message for the scale and the spinbutton.
`help_id` : | The widgets' help_id (see `gimp_help_set_help_data()`).
Returns : | The GtkSpinButton's GtkAdjustment.

### GIMP_RANDOM_SEED_SPINBUTTON()

    #define             GIMP_RANDOM_SEED_SPINBUTTON(hbox)

Returns the random_seed's GtkSpinButton.

`hbox` : | The GtkHBox returned by `gimp_random_seed_new()`.

### GIMP_RANDOM_SEED_SPINBUTTON_ADJ()

    #define             GIMP_RANDOM_SEED_SPINBUTTON_ADJ(hbox)

Returns the GtkAdjustment of the random_seed's GtkSpinButton.

`hbox` : | The GtkHBox returned by `gimp_random_seed_new()`.

### GIMP_RANDOM_SEED_TOGGLE()

    #define             GIMP_RANDOM_SEED_TOGGLE(hbox)

`hbox` : |

### gimp_random_seed_new ()

    GtkWidget*          gimp_random_seed_new                (guint32 *seed,
                                                             gboolean *random_seed);

Creates a widget that allows the user to control how the random number generator is initialized.

`seed` : | A pointer to the variable which stores the random seed.
`random_seed` : | A pointer to a boolean indicating whether seed should be initialised randomly or not.
Returns : | A GtkHBox containing a GtkSpinButton for the seed and a GtkButton for setting a random seed.

### GIMP_COORDINATES_CHAINBUTTON()

    #define             GIMP_COORDINATES_CHAINBUTTON(sizeentry)

Returns the GimpChainButton which is attached to the GimpSizeEntry.

`sizeentry` : | The GimpSizeEntry returned by `gimp_coordinates_new()`.

### gimp_coordinates_new ()

    GtkWidget*          gimp_coordinates_new                (GimpUnit unit,
                                                             const gchar *unit_format,
                                                             gboolean menu_show_pixels,
                                                             gboolean menu_show_percent,
                                                             gint spinbutton_width,
                                                             GimpSizeEntryUpdatePolicy update_policy,
                                                             gboolean chainbutton_active,
                                                             gboolean chain_constrains_ratio,
                                                             const gchar *xlabel,
                                                             gdouble x,
                                                             gdouble xres,
                                                             gdouble lower_boundary_x,
                                                             gdouble upper_boundary_x,
                                                             gdouble xsize_0,
                                                             gdouble xsize_100,
                                                             const gchar *ylabel,
                                                             gdouble y,
                                                             gdouble yres,
                                                             gdouble lower_boundary_y,
                                                             gdouble upper_boundary_y,
                                                             gdouble ysize_0,
                                                             gdouble ysize_100);

Convenience function that creates a GimpSizeEntry with two fields for x/y coordinates/sizes with a GimpChainButton attached to constrain either the two fields' values or the ratio between them.

`unit` : | The initial unit of the GimpUnitMenu.
`unit_format` : | A printf-like unit-format string as is used with `gimp_unit_menu_new()`.
`menu_show_pixels` : | `TRUE` if the GimpUnitMenu should contain an item for GIMP_UNIT_PIXEL.
`menu_show_percent` : | `TRUE` if the GimpUnitMenu should contain an item for GIMP_UNIT_PERCENT.
`spinbutton_width` : | The horizontal size of the GimpSizeEntry's GtkSpinButton's.
`update_policy` : | The update policy for the GimpSizeEntry.
`chainbutton_active` : | `TRUE` if the attached GimpChainButton should be active.
`chain_constrains_ratio` : | `TRUE` if the chainbutton should constrain the fields' aspect ratio. If `FALSE`, the values will be constrained.
`xlabel` : | The label for the X coordinate.
`x` : | The initial value of the X coordinate.
`xres` : | The horizontal resolution in DPI.
`lower_boundary_x` : | The lower boundary of the X coordinate.
`upper_boundary_x` : | The upper boundary of the X coordinate.
`xsize_0` : | The X value which will be treated as 0%.
`xsize_100` : | The X value which will be treated as 100%.
`ylabel` : | The label for the Y coordinate.
`y` : | The initial value of the Y coordinate.
`yres` : | The vertical resolution in DPI.
`lower_boundary_y` : | The lower boundary of the Y coordinate.
`upper_boundary_y` : | The upper boundary of the Y coordinate.
`ysize_0` : | The Y value which will be treated as 0%.
`ysize_100` : | The Y value which will be treated as 100%.
Returns : | The new GimpSizeEntry.

### gimp_pixmap_button_new ()

    GtkWidget*          gimp_pixmap_button_new              (gchar **xpm_data,
                                                             const gchar *text);

### Warning

`gimp_pixmap_button_new` is deprecated and should not be used in newly-written code.

Convenience function that creates a GtkButton with a GimpPixmap and an optional GtkLabel.

`xpm_data` : | The XPM data which will be passed to `gimp_pixmap_new()`.
`text` : | An optional text which will appear right of the pixmap.
Returns : | The new GtkButton.

### gimp_toggle_button_sensitive_update ()

    void                gimp_toggle_button_sensitive_update (GtkToggleButton *toggle_button);

If you attached a pointer to a GtkWidget with `g_object_set_data()` and the "set_sensitive" key to the GtkToggleButton, the sensitive state of the attached widget will be set according to the toggle button's "active" state.

You can attach an arbitrary list of widgets by attaching another "set_sensitive" data pointer to the first widget (and so on...).

This function can also set the sensitive state according to the toggle button's inverse "active" state by attaching widgets with the "inverse_sensitive" key.

`toggle_button` : | The GtkToggleButton the "set_sensitive" and "inverse_sensitive" lists are attached to.

### gimp_toggle_button_update ()

    void                gimp_toggle_button_update           (GtkWidget *widget,
                                                             gpointer data);

Note that this function calls `gimp_toggle_button_sensitive_update()`.

`widget` : | A GtkToggleButton.
`data` : | A pointer to a gint variable which will store the value of `gtk_toggle_button_get_active()`.

### gimp_radio_button_update ()

    void                gimp_radio_button_update            (GtkWidget *widget,
                                                             gpointer data);

Note that this function calls `gimp_toggle_button_sensitive_update()`.

`widget` : | A GtkRadioButton.
`data` : | A pointer to a gint variable which will store the value of GPOINTER_TO_INT (g_object_get_data (`widget`, "gimp-item-data")).

### gimp_int_adjustment_update ()

    void                gimp_int_adjustment_update          (GtkAdjustment *adjustment,
                                                             gpointer data);

Note that the GtkAdjustment's value (which is a gdouble) will be rounded with `RINT()`.

`adjustment` : | A GtkAdjustment.
`data` : | A pointer to a gint variable which will store the `adjustment`'s value.

### gimp_uint_adjustment_update ()

    void                gimp_uint_adjustment_update         (GtkAdjustment *adjustment,
                                                             gpointer data);

Note that the GtkAdjustment's value (which is a gdouble) will be rounded with (guint) (value + 0.5).

`adjustment` : | A GtkAdjustment.
`data` : | A pointer to a guint variable which will store the `adjustment`'s value.

### gimp_float_adjustment_update ()

    void                gimp_float_adjustment_update        (GtkAdjustment *adjustment,
                                                             gpointer data);

`adjustment` : | A GtkAdjustment.
`data` : | A pointer to a gfloat varaiable which will store the `adjustment`'s value.

### gimp_double_adjustment_update ()

    void                gimp_double_adjustment_update       (GtkAdjustment *adjustment,
                                                             gpointer data);

`adjustment` : | A GtkAdjustment.
`data` : | A pointer to a gdouble variable which will store the `adjustment`'s value.

### gimp_unit_menu_update ()

    void                gimp_unit_menu_update               (GtkWidget *widget,
                                                             gpointer data);

This callback can set the number of decimal digits of an arbitrary number of GtkSpinButton's. To use this functionality, attach the spinbuttons as list of data pointers attached with `g_object_set_data()` with the "set_digits" key.

See `gimp_toggle_button_sensitive_update()` for a description of how to set up the list.

`widget` : | A GimpUnitMenu.
`data` : | A pointer to a GimpUnit variable which will store the unit menu's value.

### gimp_table_attach_aligned ()

    GtkWidget*          gimp_table_attach_aligned           (GtkTable *table,
                                                             gint column,
                                                             gint row,
                                                             const gchar *label_text,
                                                             gfloat xalign,
                                                             gfloat yalign,
                                                             GtkWidget *widget,
                                                             gint colspan,
                                                             gboolean left_align);

Note that the `label_text` can be `NULL` and that the widget will be attached starting at (`column` + 1) in this case, too.

`table` : | The GtkTable the widgets will be attached to.
`column` : | The column to start with.
`row` : | The row to attach the widgets.
`label_text` : | The text for the GtkLabel which will be attached left of the widget.
`xalign` : | The horizontal alignment of the GtkLabel.
`yalign` : | The vertival alignment of the GtkLabel.
`widget` : | The GtkWidget to attach right of the label.
`colspan` : | The number of columns the widget will use.
`left_align` : | `TRUE` if the widget should be left-aligned.
Returns : | The created GtkLabel.

### gimp_label_set_attributes ()

    void                gimp_label_set_attributes           (GtkLabel *label,
                                                             ...);

Sets Pango attributes on a GtkLabel in a more convenient way than `gtk_label_set_attributes()`.

This function is useful if you want to change the font attributes of a GtkLabel. This is an alternative to using PangoMarkup which is slow to parse and akward to handle in an i18n-friendly way.

The attributes are set on the complete label, from start to end. If you need to set attributes on part of the label, you will have to use the PangoAttributes API directly.

`label` : | a GtkLabel
`...` : | a list of PangoAttrType and value pairs terminated by -1.

Since GIMP 2.2