## GtkHeaderBar

GtkHeaderBar — A box with a centered child

## Functions

GtkWidget * | gtk_header_bar_new ()
void | gtk_header_bar_set_title ()
const gchar * | gtk_header_bar_get_title ()
void | gtk_header_bar_set_subtitle ()
const gchar * | gtk_header_bar_get_subtitle ()
void | gtk_header_bar_set_has_subtitle ()
gboolean | gtk_header_bar_get_has_subtitle ()
void | gtk_header_bar_set_custom_title ()
GtkWidget * | gtk_header_bar_get_custom_title ()
void | gtk_header_bar_pack_start ()
void | gtk_header_bar_pack_end ()
void | gtk_header_bar_set_show_close_button ()
gboolean | gtk_header_bar_get_show_close_button ()
void | gtk_header_bar_set_decoration_layout ()
const gchar * | gtk_header_bar_get_decoration_layout ()

## Properties

GtkWidget * | custom-title | Read / Write
gchar * | decoration-layout | Read / Write
gboolean | decoration-layout-set | Read / Write
gboolean | has-subtitle | Read / Write
gboolean | show-close-button | Read / Write
gint | spacing | Read / Write
gchar * | subtitle | Read / Write
gchar * | title | Read / Write

## Child Properties

GtkPackType | pack-type | Read / Write
gint | position | Read / Write

## Types and Values

struct | GtkHeaderBar

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkHeaderBar

## Implemented Interfaces

GtkHeaderBar implements AtkImplementorIface and GtkBuildable.

## Includes

    #include <gtk/gtk.h>

## Description

GtkHeaderBar is similar to a horizontal GtkBox. It allows children to be placed at the start or the end. In addition, it allows a title and subtitle to be displayed. The title will be centered with respect to the width of the box, even if the children at either side take up different amounts of space. The height of the titlebar will be set to provide sufficient space for the subtitle, even if none is currently set. If a subtitle is not needed, the space reservation can be turned off with `gtk_header_bar_set_has_subtitle()`.

GtkHeaderBar can add typical window frame controls, such as minimize, maximize and close buttons, or the window icon.

## Functions

### gtk_header_bar_new ()

    GtkWidget *
    gtk_header_bar_new (void);

Creates a new GtkHeaderBar widget.

#### Returns

a new GtkHeaderBar

Since: 3.10

### gtk_header_bar_set_title ()

    void
    gtk_header_bar_set_title (GtkHeaderBar *bar,
                              const gchar *title);

Sets the title of the GtkHeaderBar. The title should help a user identify the current view. A good title should not include the application name.

#### Parameters

bar | a GtkHeaderBar |
title | a title, or `NULL`. | [allow-none]

Since: 3.10

### gtk_header_bar_get_title ()

    const gchar *
    gtk_header_bar_get_title (GtkHeaderBar *bar);

Retrieves the title of the header. See `gtk_header_bar_set_title()`.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

the title of the header, or `NULL` if none has been set explicitly. The returned string is owned by the widget and must not be modified or freed.

[nullable]

Since: 3.10

### gtk_header_bar_set_subtitle ()

    void
    gtk_header_bar_set_subtitle (GtkHeaderBar *bar,
                                 const gchar *subtitle);

Sets the subtitle of the GtkHeaderBar. The title should give a user an additional detail to help him identify the current view.

Note that GtkHeaderBar by default reserves room for the subtitle, even if none is currently set. If this is not desired, set the “has-subtitle” property to `FALSE`.

#### Parameters

bar | a GtkHeaderBar |
subtitle | a subtitle, or `NULL`. | [allow-none]

Since: 3.10

### gtk_header_bar_get_subtitle ()

    const gchar *
    gtk_header_bar_get_subtitle (GtkHeaderBar *bar);

Retrieves the subtitle of the header. See `gtk_header_bar_set_subtitle()`.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

the subtitle of the header, or `NULL` if none has been set explicitly. The returned string is owned by the widget and must not be modified or freed.

[nullable]

Since: 3.10

### gtk_header_bar_set_has_subtitle ()

    void
    gtk_header_bar_set_has_subtitle (GtkHeaderBar *bar,
                                     gboolean setting);

Sets whether the header bar should reserve space for a subtitle, even if none is currently set.

#### Parameters

bar | a GtkHeaderBar |
setting | `TRUE` to reserve space for a subtitle |

Since: 3.12

### gtk_header_bar_get_has_subtitle ()

    gboolean
    gtk_header_bar_get_has_subtitle (GtkHeaderBar *bar);

Retrieves whether the header bar reserves space for a subtitle, regardless if one is currently set or not.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

`TRUE` if the header bar reserves space for a subtitle

Since: 3.12

### gtk_header_bar_set_custom_title ()

    void
    gtk_header_bar_set_custom_title (GtkHeaderBar *bar,
                                     GtkWidget *title_widget);

Sets a custom title for the GtkHeaderBar.

The title should help a user identify the current view. This supersedes any title set by `gtk_header_bar_set_title()` or `gtk_header_bar_set_subtitle()`. To achieve the same style as the builtin title and subtitle, use the “title” and “subtitle” style classes.

You should set the custom title to `NULL`, for the header title label to be visible again.

#### Parameters

bar | a GtkHeaderBar |
title_widget | a custom widget to use for a title. | [allow-none]

Since: 3.10

### gtk_header_bar_get_custom_title ()

    GtkWidget *
    gtk_header_bar_get_custom_title (GtkHeaderBar *bar);

Retrieves the custom title widget of the header. See `gtk_header_bar_set_custom_title()`.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

the custom title widget of the header, or `NULL` if none has been set explicitly.

[nullable][transfer none]

Since: 3.10

### gtk_header_bar_pack_start ()

    void
    gtk_header_bar_pack_start (GtkHeaderBar *bar,
                               GtkWidget *child);

Adds `child` to `bar` , packed with reference to the start of the `bar` .

#### Parameters

bar | A GtkHeaderBar |
child | the GtkWidget to be added to `bar` |

Since: 3.10

### gtk_header_bar_pack_end ()

    void
    gtk_header_bar_pack_end (GtkHeaderBar *bar,
                             GtkWidget *child);

Adds `child` to `bar` , packed with reference to the end of the `bar` .

#### Parameters

bar | A GtkHeaderBar |
child | the GtkWidget to be added to `bar` |

Since: 3.10

### gtk_header_bar_set_show_close_button ()

    void
    gtk_header_bar_set_show_close_button (GtkHeaderBar *bar,
                                          gboolean setting);

Sets whether this header bar shows the standard window decorations, including close, maximize, and minimize.

#### Parameters

bar | a GtkHeaderBar |
setting | `TRUE` to show standard widow decorations |

Since: 3.10

### gtk_header_bar_get_show_close_button ()

    gboolean
    gtk_header_bar_get_show_close_button (GtkHeaderBar *bar);

Returns whether this header bar shows the standard window decorations.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

`TRUE` if the decorations are shown

Since: 3.10

### gtk_header_bar_set_decoration_layout ()

    void
    gtk_header_bar_set_decoration_layout (GtkHeaderBar *bar,
                                          const gchar *layout);

Sets the decoration layout for this header bar, overriding the “gtk-decoration-layout” setting.

There can be valid reasons for overriding the setting, such as a header bar design that does not allow for buttons to take room on the right, or only offers room for a single close button. Split header bars are another example for overriding the setting.

The format of the string is button names, separated by commas. A colon separates the buttons that should appear on the left from those on the right. Recognized button names are minimize, maximize, close, icon (the window icon) and menu (a menu button for the fallback app menu).

For example, “menu:minimize,maximize,close” specifies a menu on the left, and minimize, maximize and close buttons on the right.

#### Parameters

bar | a GtkHeaderBar |
layout | a decoration layout, or `NULL` to unset the layout. | [allow-none]

Since: 3.12

### gtk_header_bar_get_decoration_layout ()

    const gchar *
    gtk_header_bar_get_decoration_layout (GtkHeaderBar *bar);

Gets the decoration layout set with `gtk_header_bar_set_decoration_layout()`.

#### Parameters

bar | a GtkHeaderBar |

#### Returns

the decoration layout

Since: 3.12

## Types and Values

### struct GtkHeaderBar

    struct GtkHeaderBar;

## Property Details

### The `“custom-title”` property

      “custom-title”             GtkWidget *

Custom title widget to display.

Flags: Read / Write

### The `“decoration-layout”` property

      “decoration-layout”        gchar *

The decoration layout for buttons. If this property is not set, the “gtk-decoration-layout” setting is used.

See `gtk_header_bar_set_decoration_layout()` for information about the format of this string.

Flags: Read / Write

Default value: NULL

Since: 3.12

### The `“decoration-layout-set”` property

      “decoration-layout-set”    gboolean

Set to `TRUE` if “decoration-layout” is set.

Flags: Read / Write

Default value: FALSE

Since: 3.12

### The `“has-subtitle”` property

      “has-subtitle”             gboolean

If `TRUE`, reserve space for a subtitle, even if none is currently set.

Flags: Read / Write

Default value: TRUE

Since: 3.12

### The `“show-close-button”` property

      “show-close-button”        gboolean

Whether to show window decorations.

Which buttons are actually shown and where is determined by the “decoration-layout” property, and by the state of the window (e.g. a close button will not be shown if the window can't be closed).

Flags: Read / Write

Default value: FALSE

### The `“spacing”` property

      “spacing”                  gint

The amount of space between children.

Flags: Read / Write

Allowed values: >= 0

Default value: 6

### The `“subtitle”` property

      “subtitle”                 gchar *

The subtitle to display.

Flags: Read / Write

Default value: NULL

### The `“title”` property

      “title”                    gchar *

The title to display.

Flags: Read / Write

Default value: NULL

## Child Property Details

### The `“pack-type”` child property

      “pack-type”                GtkPackType

A GtkPackType indicating whether the child is packed with reference to the start or end of the parent.

Flags: Read / Write

Default value: GTK_PACK_START

### The `“position”` child property

      “position”                 gint

The index of the child in the parent.

Flags: Read / Write

Allowed values: >= -1

Default value: 0

## See Also

GtkBox, GtkActionBar