GtkAssistant: GTK+ 3 Reference Manual

## GtkAssistant GtkAssistant — A widget used to guide users through multi-step operations |

## Functions

GtkWidget * | gtk_assistant_new ()
gint | gtk_assistant_get_current_page ()
void | gtk_assistant_set_current_page ()
gint | gtk_assistant_get_n_pages ()
GtkWidget * | gtk_assistant_get_nth_page ()
gint | gtk_assistant_prepend_page ()
gint | gtk_assistant_append_page ()
gint | gtk_assistant_insert_page ()
void | gtk_assistant_remove_page ()
gint | (*GtkAssistantPageFunc) ()
void | gtk_assistant_set_forward_page_func ()
void | gtk_assistant_set_page_type ()
GtkAssistantPageType | gtk_assistant_get_page_type ()
void | gtk_assistant_set_page_title ()
const gchar * | gtk_assistant_get_page_title ()
void | gtk_assistant_set_page_header_image ()
GdkPixbuf * | gtk_assistant_get_page_header_image ()
void | gtk_assistant_set_page_side_image ()
GdkPixbuf * | gtk_assistant_get_page_side_image ()
void | gtk_assistant_set_page_complete ()
gboolean | gtk_assistant_get_page_complete ()
void | gtk_assistant_set_page_has_padding ()
gboolean | gtk_assistant_get_page_has_padding ()
void | gtk_assistant_add_action_widget ()
void | gtk_assistant_remove_action_widget ()
void | gtk_assistant_update_buttons_state ()
void | gtk_assistant_commit ()
void | gtk_assistant_next_page ()
void | gtk_assistant_previous_page ()

## Properties

gint | use-header-bar | Read / Write / Construct Only

## Child Properties

gboolean | complete | Read / Write
gboolean | has-padding | Read / Write
GdkPixbuf * | header-image | Read / Write
GtkAssistantPageType | page-type | Read / Write
GdkPixbuf * | sidebar-image | Read / Write
gchar * | title | Read / Write

## Style Properties

gint | content-padding | Read
gint | header-padding | Read

## Signals

void | apply | Run Last
void | cancel | Run Last
void | close | Run Last
void | escape | Action
void | prepare | Run Last

## Types and Values

struct | GtkAssistant
struct | GtkAssistantClass
enum | GtkAssistantPageType

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBin
                        ╰── GtkWindow
                            ╰── GtkAssistant

## Implemented Interfaces

GtkAssistant implements AtkImplementorIface and GtkBuildable.

## Includes

    #include <gtk/gtk.h>

## Description

A GtkAssistant is a widget used to represent a generally complex operation splitted in several steps, guiding the user through its pages and controlling the page flow to collect the necessary data.

The design of GtkAssistant is that it controls what buttons to show and to make sensitive, based on what it knows about the page sequence and the type of each page, in addition to state information like the page completion and committed status.

If you have a case that doesn’t quite fit in GtkAssistants way of handling buttons, you can use the GTK_ASSISTANT_PAGE_CUSTOM page type and handle buttons yourself.

### GtkAssistant as GtkBuildable

The GtkAssistant implementation of the GtkBuildable interface exposes the `action_area` as internal children with the name “action_area”.

To add pages to an assistant in GtkBuilder, simply add it as a child to the GtkAssistant object, and set its child properties as necessary.

### CSS nodes

GtkAssistant has a single CSS node with the name assistant.

## Functions

### gtk_assistant_new ()

    GtkWidget *
    gtk_assistant_new (void);

Creates a new GtkAssistant.

#### Returns

a newly created GtkAssistant

Since: 2.10

### gtk_assistant_get_current_page ()

    gint
    gtk_assistant_get_current_page (GtkAssistant *assistant);

Returns the page number of the current page.

#### Parameters

assistant | a GtkAssistant |

#### Returns

The index (starting from 0) of the current page in the `assistant` , or -1 if the `assistant` has no pages, or no current page.

Since: 2.10

### gtk_assistant_set_current_page ()

    void
    gtk_assistant_set_current_page (GtkAssistant *assistant,
                                    gint page_num);

Switches the page to `page_num` .

Note that this will only be necessary in custom buttons, as the `assistant` flow can be set with `gtk_assistant_set_forward_page_func()`.

#### Parameters

assistant | a GtkAssistant |
page_num | index of the page to switch to, starting from 0. If negative, the last page will be used. If greater than the number of pages in the `assistant` , nothing will be done. |

Since: 2.10

### gtk_assistant_get_n_pages ()

    gint
    gtk_assistant_get_n_pages (GtkAssistant *assistant);

Returns the number of pages in the `assistant`

#### Parameters

assistant | a GtkAssistant |

#### Returns

the number of pages in the `assistant`

Since: 2.10

### gtk_assistant_get_nth_page ()

    GtkWidget *
    gtk_assistant_get_nth_page (GtkAssistant *assistant,
                                gint page_num);

Returns the child widget contained in page number `page_num` .

#### Parameters

assistant | a GtkAssistant |
page_num | the index of a page in the `assistant` , or -1 to get the last page |

#### Returns

the child widget, or `NULL` if `page_num` is out of bounds.

[nullable][transfer none]

Since: 2.10

### gtk_assistant_prepend_page ()

    gint
    gtk_assistant_prepend_page (GtkAssistant *assistant,
                                GtkWidget *page);

Prepends a page to the `assistant` .

#### Parameters

assistant | a GtkAssistant |
page | a GtkWidget |

#### Returns

the index (starting at 0) of the inserted page

Since: 2.10

### gtk_assistant_append_page ()

    gint
    gtk_assistant_append_page (GtkAssistant *assistant,
                               GtkWidget *page);

Appends a page to the `assistant` .

#### Parameters

assistant | a GtkAssistant |
page | a GtkWidget |

#### Returns

the index (starting at 0) of the inserted page

Since: 2.10

### gtk_assistant_insert_page ()

    gint
    gtk_assistant_insert_page (GtkAssistant *assistant,
                               GtkWidget *page,
                               gint position);

Inserts a page in the `assistant` at a given position.

#### Parameters

assistant | a GtkAssistant |
page | a GtkWidget |
position | the index (starting at 0) at which to insert the page, or -1 to append the page to the `assistant` |

#### Returns

the index (starting from 0) of the inserted page

Since: 2.10

### gtk_assistant_remove_page ()

    void
    gtk_assistant_remove_page (GtkAssistant *assistant,
                               gint page_num);

Removes the `page_num` ’s page from `assistant` .

#### Parameters

assistant | a GtkAssistant |
page_num | the index of a page in the `assistant` , or -1 to remove the last page |

Since: 3.2

### GtkAssistantPageFunc ()

    gint
    (*GtkAssistantPageFunc) (gint current_page,
                             gpointer data);

A function used by `gtk_assistant_set_forward_page_func()` to know which is the next page given a current one. It’s called both for computing the next page when the user presses the “forward” button and for handling the behavior of the “last” button.

#### Parameters

current_page | The page number used to calculate the next page. |
data | user data. | [closure]

#### Returns

The next page number.

### gtk_assistant_set_forward_page_func ()

    void
    gtk_assistant_set_forward_page_func (GtkAssistant *assistant,
                                         GtkAssistantPageFunc page_func,
                                         gpointer data,
                                         GDestroyNotify destroy);

Sets the page forwarding function to be `page_func` .

This function will be used to determine what will be the next page when the user presses the forward button. Setting `page_func` to `NULL` will make the assistant to use the default forward function, which just goes to the next visible page.

#### Parameters

assistant | a GtkAssistant |
page_func | the GtkAssistantPageFunc, or `NULL` to use the default one. | [allow-none]
data | user data for `page_func` |
destroy | destroy notifier for `data` |

Since: 2.10

### gtk_assistant_set_page_type ()

    void
    gtk_assistant_set_page_type (GtkAssistant *assistant,
                                 GtkWidget *page,
                                 GtkAssistantPageType type);

Sets the page type for `page` .

The page type determines the page behavior in the `assistant` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
type | the new type for `page` |

Since: 2.10

### gtk_assistant_get_page_type ()

    GtkAssistantPageType
    gtk_assistant_get_page_type (GtkAssistant *assistant,
                                 GtkWidget *page);

Gets the page type of `page` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

the page type of `page`

Since: 2.10

### gtk_assistant_set_page_title ()

    void
    gtk_assistant_set_page_title (GtkAssistant *assistant,
                                  GtkWidget *page,
                                  const gchar *title);

Sets a title for `page` .

The title is displayed in the header area of the assistant when `page` is the current page.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
title | the new title for `page` |

Since: 2.10

### gtk_assistant_get_page_title ()

    const gchar *
    gtk_assistant_get_page_title (GtkAssistant *assistant,
                                  GtkWidget *page);

Gets the title for `page` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

the title for `page`

Since: 2.10

### gtk_assistant_set_page_header_image ()

    void
    gtk_assistant_set_page_header_image (GtkAssistant *assistant,
                                         GtkWidget *page,
                                         GdkPixbuf *pixbuf);

`gtk_assistant_set_page_header_image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, a header is no longer shown; add your header decoration to the page content instead.

Sets a header image for `page` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
pixbuf | the new header image `page` . | [allow-none]

Since: 2.10

### gtk_assistant_get_page_header_image ()

    GdkPixbuf *
    gtk_assistant_get_page_header_image (GtkAssistant *assistant,
                                         GtkWidget *page);

`gtk_assistant_get_page_header_image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, a header is no longer shown; add your header decoration to the page content instead.

Gets the header image for `page` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

the header image for `page` , or `NULL` if there’s no header image for the page.

[transfer none]

Since: 2.10

### gtk_assistant_set_page_side_image ()

    void
    gtk_assistant_set_page_side_image (GtkAssistant *assistant,
                                       GtkWidget *page,
                                       GdkPixbuf *pixbuf);

`gtk_assistant_set_page_side_image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, sidebar images are not shown anymore.

Sets a side image for `page` .

This image used to be displayed in the side area of the assistant when `page` is the current page.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
pixbuf | the new side image `page` . | [allow-none]

Since: 2.10

### gtk_assistant_get_page_side_image ()

    GdkPixbuf *
    gtk_assistant_get_page_side_image (GtkAssistant *assistant,
                                       GtkWidget *page);

`gtk_assistant_get_page_side_image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, sidebar images are not shown anymore.

Gets the side image for `page` .

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

the side image for `page` , or `NULL` if there’s no side image for the page.

[transfer none]

Since: 2.10

### gtk_assistant_set_page_complete ()

    void
    gtk_assistant_set_page_complete (GtkAssistant *assistant,
                                     GtkWidget *page,
                                     gboolean complete);

Sets whether `page` contents are complete.

This will make `assistant` update the buttons state to be able to continue the task.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
complete | the completeness status of the page |

Since: 2.10

### gtk_assistant_get_page_complete ()

    gboolean
    gtk_assistant_get_page_complete (GtkAssistant *assistant,
                                     GtkWidget *page);

Gets whether `page` is complete.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

`TRUE` if `page` is complete.

Since: 2.10

### gtk_assistant_set_page_has_padding ()

    void
    gtk_assistant_set_page_has_padding (GtkAssistant *assistant,
                                        GtkWidget *page,
                                        gboolean has_padding);

Sets whether the assistant is adding padding around the page.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |
has_padding | whether this page has padding |

Since: 3.18

### gtk_assistant_get_page_has_padding ()

    gboolean
    gtk_assistant_get_page_has_padding (GtkAssistant *assistant,
                                        GtkWidget *page);

Gets whether page has padding.

#### Parameters

assistant | a GtkAssistant |
page | a page of `assistant` |

#### Returns

`TRUE` if `page` has padding

Since: 3.18

### gtk_assistant_add_action_widget ()

    void
    gtk_assistant_add_action_widget (GtkAssistant *assistant,
                                     GtkWidget *child);

Adds a widget to the action area of a GtkAssistant.

#### Parameters

assistant | a GtkAssistant |
child | a GtkWidget |

Since: 2.10

### gtk_assistant_remove_action_widget ()

    void
    gtk_assistant_remove_action_widget (GtkAssistant *assistant,
                                        GtkWidget *child);

Removes a widget from the action area of a GtkAssistant.

#### Parameters

assistant | a GtkAssistant |
child | a GtkWidget |

Since: 2.10

### gtk_assistant_update_buttons_state ()

    void
    gtk_assistant_update_buttons_state (GtkAssistant *assistant);

Forces `assistant` to recompute the buttons state.

GTK+ automatically takes care of this in most situations, e.g. when the user goes to a different page, or when the visibility or completeness of a page changes.

One situation where it can be necessary to call this function is when changing a value on the current page affects the future page flow of the assistant.

#### Parameters

assistant | a GtkAssistant |

Since: 2.10

### gtk_assistant_commit ()

    void
    gtk_assistant_commit (GtkAssistant *assistant);

Erases the visited page history so the back button is not shown on the current page, and removes the cancel button from subsequent pages.

Use this when the information provided up to the current page is hereafter deemed permanent and cannot be modified or undone. For example, showing a progress page to track a long-running, unreversible operation after the user has clicked apply on a confirmation page.

#### Parameters

assistant | a GtkAssistant |

Since: 2.22

### gtk_assistant_next_page ()

    void
    gtk_assistant_next_page (GtkAssistant *assistant);

Navigate to the next page.

It is a programming error to call this function when there is no next page.

This function is for use when creating pages of the GTK_ASSISTANT_PAGE_CUSTOM type.

#### Parameters

assistant | a GtkAssistant |

Since: 3.0

### gtk_assistant_previous_page ()

    void
    gtk_assistant_previous_page (GtkAssistant *assistant);

Navigate to the previous visited page.

It is a programming error to call this function when no previous page is available.

This function is for use when creating pages of the GTK_ASSISTANT_PAGE_CUSTOM type.

#### Parameters

assistant | a GtkAssistant |

Since: 3.0

## Types and Values

### struct GtkAssistant

    struct GtkAssistant;

### struct GtkAssistantClass

    struct GtkAssistantClass {
      GtkWindowClass parent_class;

      void (* prepare) (GtkAssistant *assistant, GtkWidget *page);
      void (* apply)   (GtkAssistant *assistant);
      void (* close)   (GtkAssistant *assistant);
      void (* cancel)  (GtkAssistant *assistant);
    };

#### Members

`prepare` () | Signal emitted when a new page is set as the assistant’s current page, before making the new page visible. |
`apply` () | Signal emitted when the apply button is clicked. |
`close` () | Signal emitted either when the close button or last page apply button is clicked. |
`cancel` () | Signal emitted when the cancel button is clicked. |

### enum GtkAssistantPageType

An enum for determining the page role inside the GtkAssistant. It's used to handle buttons sensitivity and visibility.

Note that an assistant needs to end its page flow with a page of type `GTK_ASSISTANT_PAGE_CONFIRM`, `GTK_ASSISTANT_PAGE_SUMMARY` or `GTK_ASSISTANT_PAGE_PROGRESS` to be correct.

The Cancel button will only be shown if the page isn’t “committed”. See `gtk_assistant_commit()` for details.

#### Members

GTK_ASSISTANT_PAGE_CONTENT | The page has regular contents. Both the Back and forward buttons will be shown. |
GTK_ASSISTANT_PAGE_INTRO | The page contains an introduction to the assistant task. Only the Forward button will be shown if there is a next page. |
GTK_ASSISTANT_PAGE_CONFIRM | The page lets the user confirm or deny the changes. The Back and Apply buttons will be shown. |
GTK_ASSISTANT_PAGE_SUMMARY | The page informs the user of the changes done. Only the Close button will be shown. |
GTK_ASSISTANT_PAGE_PROGRESS | Used for tasks that take a long time to complete, blocks the assistant until the page is marked as complete. Only the back button will be shown. |
GTK_ASSISTANT_PAGE_CUSTOM | Used for when other page types are not appropriate. No buttons will be shown, and the application must add its own buttons through `gtk_assistant_add_action_widget()`. |

## Property Details

### The `“use-header-bar”` property

      “use-header-bar”           gint

`TRUE` if the assistant uses a GtkHeaderBar for action buttons instead of the action-area.

For technical reasons, this property is declared as an integer property, but you should only set it to `TRUE` or `FALSE`.

Flags: Read / Write / Construct Only

Allowed values: [-1,1]

Default value: -1

Since: 3.12

## Child Property Details

### The `“complete”` child property

      “complete”                 gboolean

Setting the "complete" child property to `TRUE` marks a page as complete (i.e.: all the required fields are filled out). GTK+ uses this information to control the sensitivity of the navigation buttons.

Flags: Read / Write

Default value: FALSE

Since: 2.10

### The `“has-padding”` child property

      “has-padding”              gboolean

Whether the assistant adds padding around the page.

Flags: Read / Write

Default value: TRUE

### The `“header-image”` child property

      “header-image”             GdkPixbuf *

This image used to be displayed in the page header.

`GtkAssistant:header-image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, a header is no longer shown; add your header decoration to the page content instead.

Flags: Read / Write

Since: 2.10

### The `“page-type”` child property

      “page-type”                GtkAssistantPageType

The type of the assistant page.

Flags: Read / Write

Default value: GTK_ASSISTANT_PAGE_CONTENT

Since: 2.10

### The `“sidebar-image”` child property

      “sidebar-image”            GdkPixbuf *

This image used to be displayed in the 'sidebar'.

`GtkAssistant:sidebar-image` has been deprecated since version 3.2 and should not be used in newly-written code.

Since GTK+ 3.2, the sidebar image is no longer shown.

Flags: Read / Write

Since: 2.10

### The `“title”` child property

      “title”                    gchar *

The title of the page.

Flags: Read / Write

Default value: NULL

Since: 2.10

## Style Property Details

### The `“content-padding”` style property

      “content-padding”          gint

Number of pixels around the content.

`GtkAssistant:content-padding` has been deprecated since version 3.20 and should not be used in newly-written code.

This style property is ignored.

Flags: Read

Allowed values: >= 0

Default value: 1

### The `“header-padding”` style property

      “header-padding”           gint

Number of pixels around the header.

`GtkAssistant:header-padding` has been deprecated since version 3.20 and should not be used in newly-written code.

This style property is ignored.

Flags: Read

Allowed values: >= 0

Default value: 6

## Signal Details

### The `“apply”` signal

    void
    user_function (GtkAssistant *assistant,
                   gpointer      user_data)

The ::apply signal is emitted when the apply button is clicked.

The default behavior of the GtkAssistant is to switch to the page after the current page, unless the current page is the last one.

A handler for the ::apply signal should carry out the actions for which the wizard has collected data. If the action takes a long time to complete, you might consider putting a page of type `GTK_ASSISTANT_PAGE_PROGRESS` after the confirmation page and handle this operation within the “prepare” signal of the progress page.

#### Parameters

assistant | the GtkAssistant |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 2.10

### The `“cancel”` signal

    void
    user_function (GtkAssistant *assistant,
                   gpointer      user_data)

The ::cancel signal is emitted when then the cancel button is clicked.

#### Parameters

assistant | the GtkAssistant |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 2.10

### The `“close”` signal

    void
    user_function (GtkAssistant *assistant,
                   gpointer      user_data)

The ::close signal is emitted either when the close button of a summary page is clicked, or when the apply button in the last page in the flow (of type `GTK_ASSISTANT_PAGE_CONFIRM`) is clicked.

#### Parameters

assistant | the GtkAssistant |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 2.10

### The `“escape”` signal

    void
    user_function (GtkAssistant *assistant,
                   gpointer      user_data)

Flags: Action

### The `“prepare”` signal

    void
    user_function (GtkAssistant *assistant,
                   GtkWidget    *page,
                   gpointer      user_data)

The ::prepare signal is emitted when a new page is set as the assistant's current page, before making the new page visible.

A handler for this signal can do any preparations which are necessary before showing `page` .

#### Parameters

assistant | the GtkAssistant |
page | the current page |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 2.10