gtk/auto/

assistant.rs

// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{
    Align, Application, AssistantPageType, Bin, Buildable, Container, ResizeMode, Widget, Window,
    WindowPosition, WindowType, ffi,
};
use glib::{
    object::ObjectType as _,
    prelude::*,
    signal::{SignalHandlerId, connect_raw},
    translate::*,
};
use std::boxed::Box as Box_;

glib::wrapper! {
    /// A [`Assistant`][crate::Assistant] 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][GtkAssistantPageType] of each page,
    /// in addition to state information like the page
    /// [completion][gtk-assistant-set-page-complete]
    /// and [committed][gtk-assistant-commit] status.
    ///
    /// If you have a case that doesn’t quite fit in `GtkAssistants` way of
    /// handling buttons, you can use the [`AssistantPageType::Custom`][crate::AssistantPageType::Custom] page
    /// type and handle buttons yourself.
    ///
    /// # GtkAssistant as GtkBuildable
    ///
    /// The GtkAssistant implementation of the [`Buildable`][crate::Buildable] interface
    /// exposes the `action_area` as internal children with the name
    /// “action_area”.
    ///
    /// To add pages to an assistant in [`Builder`][crate::Builder], 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.
    ///
    /// ## Properties
    ///
    ///
    /// #### `use-header-bar`
    ///  [`true`] if the assistant uses a [`HeaderBar`][crate::HeaderBar] 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`].
    ///
    /// Readable | Writable | Construct Only
    /// <details><summary><h4>Window</h4></summary>
    ///
    ///
    /// #### `accept-focus`
    ///  Whether the window should receive the input focus.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `application`
    ///  The [`Application`][crate::Application] associated with the window.
    ///
    /// The application will be kept alive for at least as long as it
    /// has any windows associated with it (see [`ApplicationExtManual::hold()`][crate::gio::prelude::ApplicationExtManual::hold()]
    /// for a way to keep it alive without windows).
    ///
    /// Normally, the connection between the application and the window
    /// will remain until the window is destroyed, but you can explicitly
    /// remove it by setting the :application property to [`None`].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `attached-to`
    ///  The widget to which this window is attached.
    /// See [`GtkWindowExt::set_attached_to()`][crate::prelude::GtkWindowExt::set_attached_to()].
    ///
    /// Examples of places where specifying this relation is useful are
    /// for instance a [`Menu`][crate::Menu] created by a [`ComboBox`][crate::ComboBox], a completion
    /// popup window created by [`Entry`][crate::Entry] or a typeahead search entry
    /// created by [`TreeView`][crate::TreeView].
    ///
    /// Readable | Writable | Construct
    ///
    ///
    /// #### `decorated`
    ///  Whether the window should be decorated by the window manager.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `default-height`
    ///  Readable | Writable
    ///
    ///
    /// #### `default-width`
    ///  Readable | Writable
    ///
    ///
    /// #### `deletable`
    ///  Whether the window frame should have a close button.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `destroy-with-parent`
    ///  Readable | Writable
    ///
    ///
    /// #### `focus-on-map`
    ///  Whether the window should receive the input focus when mapped.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `focus-visible`
    ///  Whether 'focus rectangles' are currently visible in this window.
    ///
    /// This property is maintained by GTK+ based on user input
    /// and should not be set by applications.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `gravity`
    ///  The window gravity of the window. See [`GtkWindowExt::move_()`][crate::prelude::GtkWindowExt::move_()] and [`gdk::Gravity`][crate::gdk::Gravity] for
    /// more details about window gravity.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `has-resize-grip`
    ///  Whether the window has a corner resize grip.
    ///
    /// Note that the resize grip is only shown if the window is
    /// actually resizable and not maximized. Use
    /// [`resize-grip-visible`][struct@crate::Window#resize-grip-visible] to find out if the resize
    /// grip is currently shown.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `has-toplevel-focus`
    ///  Readable
    ///
    ///
    /// #### `hide-titlebar-when-maximized`
    ///  Whether the titlebar should be hidden during maximization.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `icon`
    ///  Readable | Writable
    ///
    ///
    /// #### `icon-name`
    ///  The :icon-name property specifies the name of the themed icon to
    /// use as the window icon. See [`IconTheme`][crate::IconTheme] for more details.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `is-active`
    ///  Readable
    ///
    ///
    /// #### `is-maximized`
    ///  Readable
    ///
    ///
    /// #### `mnemonics-visible`
    ///  Whether mnemonics are currently visible in this window.
    ///
    /// This property is maintained by GTK+ based on user input,
    /// and should not be set by applications.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `modal`
    ///  Readable | Writable
    ///
    ///
    /// #### `resizable`
    ///  Readable | Writable
    ///
    ///
    /// #### `resize-grip-visible`
    ///  Whether a corner resize grip is currently shown.
    ///
    /// Readable
    ///
    ///
    /// #### `role`
    ///  Readable | Writable
    ///
    ///
    /// #### `screen`
    ///  Readable | Writable
    ///
    ///
    /// #### `skip-pager-hint`
    ///  Readable | Writable
    ///
    ///
    /// #### `skip-taskbar-hint`
    ///  Readable | Writable
    ///
    ///
    /// #### `startup-id`
    ///  The :startup-id is a write-only property for setting window's
    /// startup notification identifier. See [`GtkWindowExt::set_startup_id()`][crate::prelude::GtkWindowExt::set_startup_id()]
    /// for more details.
    ///
    /// Writable
    ///
    ///
    /// #### `title`
    ///  Readable | Writable
    ///
    ///
    /// #### `transient-for`
    ///  The transient parent of the window. See [`GtkWindowExt::set_transient_for()`][crate::prelude::GtkWindowExt::set_transient_for()] for
    /// more details about transient windows.
    ///
    /// Readable | Writable | Construct
    ///
    ///
    /// #### `type`
    ///  Readable | Writable | Construct Only
    ///
    ///
    /// #### `type-hint`
    ///  Readable | Writable
    ///
    ///
    /// #### `urgency-hint`
    ///  Readable | Writable
    ///
    ///
    /// #### `window-position`
    ///  Readable | Writable
    /// </details>
    /// <details><summary><h4>Container</h4></summary>
    ///
    ///
    /// #### `border-width`
    ///  Readable | Writable
    ///
    ///
    /// #### `child`
    ///  Writable
    ///
    ///
    /// #### `resize-mode`
    ///  Readable | Writable
    /// </details>
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `app-paintable`
    ///  Readable | Writable
    ///
    ///
    /// #### `can-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `can-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `composite-child`
    ///  Readable
    ///
    ///
    /// #### `double-buffered`
    ///  Whether the widget is double buffered.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `events`
    ///  Readable | Writable
    ///
    ///
    /// #### `expand`
    ///  Whether to expand in both directions. Setting this sets both [`hexpand`][struct@crate::Widget#hexpand] and [`vexpand`][struct@crate::Widget#vexpand]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `focus-on-click`
    ///  Whether the widget should grab focus when it is clicked with the mouse.
    ///
    /// This property is only relevant for widgets that can take focus.
    ///
    /// Before 3.20, several widgets (GtkButton, GtkFileChooserButton,
    /// GtkComboBox) implemented this property individually.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `halign`
    ///  How to distribute horizontal space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `has-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `has-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `has-tooltip`
    ///  Enables or disables the emission of [`query-tooltip`][struct@crate::Widget#query-tooltip] on `widget`.
    /// A value of [`true`] indicates that `widget` can have a tooltip, in this case
    /// the widget will be queried using [`query-tooltip`][struct@crate::Widget#query-tooltip] to determine
    /// whether it will provide a tooltip or not.
    ///
    /// Note that setting this property to [`true`] for the first time will change
    /// the event masks of the GdkWindows of this widget to include leave-notify
    /// and motion-notify events. This cannot and will not be undone when the
    /// property is set to [`false`] again.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `height-request`
    ///  Readable | Writable
    ///
    ///
    /// #### `hexpand`
    ///  Whether to expand horizontally. See [`WidgetExt::set_hexpand()`][crate::prelude::WidgetExt::set_hexpand()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `hexpand-set`
    ///  Whether to use the [`hexpand`][struct@crate::Widget#hexpand] property. See [`WidgetExt::is_hexpand_set()`][crate::prelude::WidgetExt::is_hexpand_set()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `is-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `margin`
    ///  Sets all four sides' margin at once. If read, returns max
    /// margin on any side.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-bottom`
    ///  Margin on bottom side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-end`
    ///  Margin on end of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-left`
    ///  Margin on left side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-right`
    ///  Margin on right side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-start`
    ///  Margin on start of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-top`
    ///  Margin on top side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `name`
    ///  Readable | Writable
    ///
    ///
    /// #### `no-show-all`
    ///  Readable | Writable
    ///
    ///
    /// #### `opacity`
    ///  The requested opacity of the widget. See [`WidgetExt::set_opacity()`][crate::prelude::WidgetExt::set_opacity()] for
    /// more details about window opacity.
    ///
    /// Before 3.8 this was only available in GtkWindow
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `parent`
    ///  Readable | Writable
    ///
    ///
    /// #### `receives-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `scale-factor`
    ///  The scale factor of the widget. See [`WidgetExt::scale_factor()`][crate::prelude::WidgetExt::scale_factor()] for
    /// more details about widget scaling.
    ///
    /// Readable
    ///
    ///
    /// #### `sensitive`
    ///  Readable | Writable
    ///
    ///
    /// #### `style`
    ///  The style of the widget, which contains information about how it will look (colors, etc).
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `tooltip-markup`
    ///  Sets the text of tooltip to be the given string, which is marked up
    /// with the [Pango text markup language][PangoMarkupFormat].
    /// Also see [`Tooltip::set_markup()`][crate::Tooltip::set_markup()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `tooltip-text`
    ///  Sets the text of tooltip to be the given string.
    ///
    /// Also see [`Tooltip::set_text()`][crate::Tooltip::set_text()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `valign`
    ///  How to distribute vertical space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `vexpand`
    ///  Whether to expand vertically. See [`WidgetExt::set_vexpand()`][crate::prelude::WidgetExt::set_vexpand()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `vexpand-set`
    ///  Whether to use the [`vexpand`][struct@crate::Widget#vexpand] property. See [`WidgetExt::is_vexpand_set()`][crate::prelude::WidgetExt::is_vexpand_set()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `visible`
    ///  Readable | Writable
    ///
    ///
    /// #### `width-request`
    ///  Readable | Writable
    ///
    ///
    /// #### `window`
    ///  The widget's window if it is realized, [`None`] otherwise.
    ///
    /// Readable
    /// </details>
    ///
    /// ## Signals
    ///
    ///
    /// #### `apply`
    ///  The ::apply signal is emitted when the apply button is clicked.
    ///
    /// The default behavior of the [`Assistant`][crate::Assistant] 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
    /// [`AssistantPageType::Progress`][crate::AssistantPageType::Progress] after the confirmation page and handle
    /// this operation within the [`prepare`][struct@crate::Assistant#prepare] signal of the progress
    /// page.
    ///
    ///
    ///
    ///
    /// #### `cancel`
    ///  The ::cancel signal is emitted when then the cancel button is clicked.
    ///
    ///
    ///
    ///
    /// #### `close`
    ///  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 [`AssistantPageType::Confirm`][crate::AssistantPageType::Confirm]) is clicked.
    ///
    ///
    ///
    ///
    /// #### `escape`
    ///  Action
    ///
    ///
    /// #### `prepare`
    ///  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`.
    ///
    ///
    /// <details><summary><h4>Window</h4></summary>
    ///
    ///
    /// #### `activate-default`
    ///  The ::activate-default signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user activates the default widget
    /// of `window`.
    ///
    /// Action
    ///
    ///
    /// #### `activate-focus`
    ///  The ::activate-focus signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user activates the currently
    /// focused widget of `window`.
    ///
    /// Action
    ///
    ///
    /// #### `enable-debugging`
    ///  The ::enable-debugging signal is a [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user enables or disables interactive
    /// debugging. When `toggle` is [`true`], interactive debugging is toggled
    /// on or off, when it is [`false`], the debugger will be pointed at the
    /// widget under the pointer.
    ///
    /// The default bindings for this signal are Ctrl-Shift-I
    /// and Ctrl-Shift-D.
    ///
    /// Action
    ///
    ///
    /// #### `keys-changed`
    ///  The ::keys-changed signal gets emitted when the set of accelerators
    /// or mnemonics that are associated with `window` changes.
    ///
    ///
    ///
    ///
    /// #### `set-focus`
    ///  This signal is emitted whenever the currently focused widget in
    /// this window changes.
    ///
    ///
    /// </details>
    /// <details><summary><h4>Container</h4></summary>
    ///
    ///
    /// #### `add`
    ///
    ///
    ///
    /// #### `check-resize`
    ///
    ///
    ///
    /// #### `remove`
    ///
    ///
    ///
    /// #### `set-focus-child`
    ///
    /// </details>
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `accel-closures-changed`
    ///
    ///
    ///
    /// #### `button-press-event`
    ///  The ::button-press-event signal will be emitted when a button
    /// (typically from a mouse) is pressed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the
    /// widget needs to enable the [`gdk::EventMask::BUTTON_PRESS_MASK`][crate::gdk::EventMask::BUTTON_PRESS_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `button-release-event`
    ///  The ::button-release-event signal will be emitted when a button
    /// (typically from a mouse) is released.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the
    /// widget needs to enable the [`gdk::EventMask::BUTTON_RELEASE_MASK`][crate::gdk::EventMask::BUTTON_RELEASE_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `can-activate-accel`
    ///  Determines whether an accelerator that activates the signal
    /// identified by `signal_id` can currently be activated.
    /// This signal is present to allow applications and derived
    /// widgets to override the default [`Widget`][crate::Widget] handling
    /// for determining whether an accelerator can be activated.
    ///
    ///
    ///
    ///
    /// #### `child-notify`
    ///  The ::child-notify signal is emitted for each
    /// [child property][child-properties] that has
    /// changed on an object. The signal's detail holds the property name.
    ///
    /// Detailed
    ///
    ///
    /// #### `composited-changed`
    ///  The ::composited-changed signal is emitted when the composited
    /// status of `widgets` screen changes.
    /// See [`Screen::is_composited()`][crate::gdk::Screen::is_composited()].
    ///
    /// Action
    ///
    ///
    /// #### `configure-event`
    ///  The ::configure-event signal will be emitted when the size, position or
    /// stacking of the `widget`'s window has changed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `damage-event`
    ///  Emitted when a redirected window belonging to `widget` gets drawn into.
    /// The region/area members of the event shows what area of the redirected
    /// drawable was drawn into.
    ///
    ///
    ///
    ///
    /// #### `delete-event`
    ///  The ::delete-event signal is emitted if a user requests that
    /// a toplevel window is closed. The default handler for this signal
    /// destroys the window. Connecting [`WidgetExtManual::hide_on_delete()`][crate::prelude::WidgetExtManual::hide_on_delete()] to
    /// this signal will cause the window to be hidden instead, so that
    /// it can later be shown again without reconstructing it.
    ///
    ///
    ///
    ///
    /// #### `destroy`
    ///  Signals that all holders of a reference to the widget should release
    /// the reference that they hold. May result in finalization of the widget
    /// if all references are released.
    ///
    /// This signal is not suitable for saving widget state.
    ///
    ///
    ///
    ///
    /// #### `destroy-event`
    ///  The ::destroy-event signal is emitted when a [`gdk::Window`][crate::gdk::Window] is destroyed.
    /// You rarely get this signal, because most widgets disconnect themselves
    /// from their window before they destroy it, so no widget owns the
    /// window at destroy time.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `direction-changed`
    ///  The ::direction-changed signal is emitted when the text direction
    /// of a widget changes.
    ///
    ///
    ///
    ///
    /// #### `drag-begin`
    ///  The ::drag-begin signal is emitted on the drag source when a drag is
    /// started. A typical reason to connect to this signal is to set up a
    /// custom drag icon with e.g. [`WidgetExt::drag_source_set_icon_pixbuf()`][crate::prelude::WidgetExt::drag_source_set_icon_pixbuf()].
    ///
    /// Note that some widgets set up a drag icon in the default handler of
    /// this signal, so you may have to use `g_signal_connect_after()` to
    /// override what the default handler did.
    ///
    ///
    ///
    ///
    /// #### `drag-data-delete`
    ///  The ::drag-data-delete signal is emitted on the drag source when a drag
    /// with the action [`gdk::DragAction::MOVE`][crate::gdk::DragAction::MOVE] is successfully completed. The signal
    /// handler is responsible for deleting the data that has been dropped. What
    /// "delete" means depends on the context of the drag operation.
    ///
    ///
    ///
    ///
    /// #### `drag-data-get`
    ///  The ::drag-data-get signal is emitted on the drag source when the drop
    /// site requests the data which is dragged. It is the responsibility of
    /// the signal handler to fill `data` with the data in the format which
    /// is indicated by `info`. See [`SelectionData::set()`][crate::SelectionData::set()] and
    /// [`SelectionData::set_text()`][crate::SelectionData::set_text()].
    ///
    ///
    ///
    ///
    /// #### `drag-data-received`
    ///  The ::drag-data-received signal is emitted on the drop site when the
    /// dragged data has been received. If the data was received in order to
    /// determine whether the drop will be accepted, the handler is expected
    /// to call `gdk_drag_status()` and not finish the drag.
    /// If the data was received in response to a [`drag-drop`][struct@crate::Widget#drag-drop] signal
    /// (and this is the last target to be received), the handler for this
    /// signal is expected to process the received data and then call
    /// `gtk_drag_finish()`, setting the `success` parameter depending on
    /// whether the data was processed successfully.
    ///
    /// Applications must create some means to determine why the signal was emitted
    /// and therefore whether to call `gdk_drag_status()` or `gtk_drag_finish()`.
    ///
    /// The handler may inspect the selected action with
    /// [`DragContext::selected_action()`][crate::gdk::DragContext::selected_action()] before calling
    /// `gtk_drag_finish()`, e.g. to implement [`gdk::DragAction::ASK`][crate::gdk::DragAction::ASK] as
    /// shown in the following example:
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// void
    /// drag_data_received (GtkWidget          *widget,
    ///                     GdkDragContext     *context,
    ///                     gint                x,
    ///                     gint                y,
    ///                     GtkSelectionData   *data,
    ///                     guint               info,
    ///                     guint               time)
    /// {
    ///   if ((data->length >= 0) && (data->format == 8))
    ///     {
    ///       GdkDragAction action;
    ///
    ///       // handle data here
    ///
    ///       action = gdk_drag_context_get_selected_action (context);
    ///       if (action == GDK_ACTION_ASK)
    ///         {
    ///           GtkWidget *dialog;
    ///           gint response;
    ///
    ///           dialog = gtk_message_dialog_new (NULL,
    ///                                            GTK_DIALOG_MODAL |
    ///                                            GTK_DIALOG_DESTROY_WITH_PARENT,
    ///                                            GTK_MESSAGE_INFO,
    ///                                            GTK_BUTTONS_YES_NO,
    ///                                            "Move the data ?\n");
    ///           response = gtk_dialog_run (GTK_DIALOG (dialog));
    ///           gtk_widget_destroy (dialog);
    ///
    ///           if (response == GTK_RESPONSE_YES)
    ///             action = GDK_ACTION_MOVE;
    ///           else
    ///             action = GDK_ACTION_COPY;
    ///          }
    ///
    ///       gtk_drag_finish (context, TRUE, action == GDK_ACTION_MOVE, time);
    ///     }
    ///   else
    ///     gtk_drag_finish (context, FALSE, FALSE, time);
    ///  }
    /// ```
    ///
    ///
    ///
    ///
    /// #### `drag-drop`
    ///  The ::drag-drop signal is emitted on the drop site when the user drops
    /// the data onto the widget. The signal handler must determine whether
    /// the cursor position is in a drop zone or not. If it is not in a drop
    /// zone, it returns [`false`] and no further processing is necessary.
    /// Otherwise, the handler returns [`true`]. In this case, the handler must
    /// ensure that `gtk_drag_finish()` is called to let the source know that
    /// the drop is done. The call to `gtk_drag_finish()` can be done either
    /// directly or in a [`drag-data-received`][struct@crate::Widget#drag-data-received] handler which gets
    /// triggered by calling [`WidgetExt::drag_get_data()`][crate::prelude::WidgetExt::drag_get_data()] to receive the data for one
    /// or more of the supported targets.
    ///
    ///
    ///
    ///
    /// #### `drag-end`
    ///  The ::drag-end signal is emitted on the drag source when a drag is
    /// finished. A typical reason to connect to this signal is to undo
    /// things done in [`drag-begin`][struct@crate::Widget#drag-begin].
    ///
    ///
    ///
    ///
    /// #### `drag-failed`
    ///  The ::drag-failed signal is emitted on the drag source when a drag has
    /// failed. The signal handler may hook custom code to handle a failed DnD
    /// operation based on the type of error, it returns [`true`] is the failure has
    /// been already handled (not showing the default "drag operation failed"
    /// animation), otherwise it returns [`false`].
    ///
    ///
    ///
    ///
    /// #### `drag-leave`
    ///  The ::drag-leave signal is emitted on the drop site when the cursor
    /// leaves the widget. A typical reason to connect to this signal is to
    /// undo things done in [`drag-motion`][struct@crate::Widget#drag-motion], e.g. undo highlighting
    /// with [`WidgetExt::drag_unhighlight()`][crate::prelude::WidgetExt::drag_unhighlight()].
    ///
    ///
    /// Likewise, the [`drag-leave`][struct@crate::Widget#drag-leave] signal is also emitted before the
    /// ::drag-drop signal, for instance to allow cleaning up of a preview item
    /// created in the [`drag-motion`][struct@crate::Widget#drag-motion] signal handler.
    ///
    ///
    ///
    ///
    /// #### `drag-motion`
    ///  The ::drag-motion signal is emitted on the drop site when the user
    /// moves the cursor over the widget during a drag. The signal handler
    /// must determine whether the cursor position is in a drop zone or not.
    /// If it is not in a drop zone, it returns [`false`] and no further processing
    /// is necessary. Otherwise, the handler returns [`true`]. In this case, the
    /// handler is responsible for providing the necessary information for
    /// displaying feedback to the user, by calling `gdk_drag_status()`.
    ///
    /// If the decision whether the drop will be accepted or rejected can't be
    /// made based solely on the cursor position and the type of the data, the
    /// handler may inspect the dragged data by calling [`WidgetExt::drag_get_data()`][crate::prelude::WidgetExt::drag_get_data()] and
    /// defer the `gdk_drag_status()` call to the [`drag-data-received`][struct@crate::Widget#drag-data-received]
    /// handler. Note that you must pass [`DestDefaults::DROP`][crate::DestDefaults::DROP],
    /// [`DestDefaults::MOTION`][crate::DestDefaults::MOTION] or [`DestDefaults::ALL`][crate::DestDefaults::ALL] to [`WidgetExtManual::drag_dest_set()`][crate::prelude::WidgetExtManual::drag_dest_set()]
    /// when using the drag-motion signal that way.
    ///
    /// Also note that there is no drag-enter signal. The drag receiver has to
    /// keep track of whether he has received any drag-motion signals since the
    /// last [`drag-leave`][struct@crate::Widget#drag-leave] and if not, treat the drag-motion signal as
    /// an "enter" signal. Upon an "enter", the handler will typically highlight
    /// the drop site with [`WidgetExt::drag_highlight()`][crate::prelude::WidgetExt::drag_highlight()].
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// static void
    /// drag_motion (GtkWidget      *widget,
    ///              GdkDragContext *context,
    ///              gint            x,
    ///              gint            y,
    ///              guint           time)
    /// {
    ///   GdkAtom target;
    ///
    ///   PrivateData *private_data = GET_PRIVATE_DATA (widget);
    ///
    ///   if (!private_data->drag_highlight)
    ///    {
    ///      private_data->drag_highlight = 1;
    ///      gtk_drag_highlight (widget);
    ///    }
    ///
    ///   target = gtk_drag_dest_find_target (widget, context, NULL);
    ///   if (target == GDK_NONE)
    ///     gdk_drag_status (context, 0, time);
    ///   else
    ///    {
    ///      private_data->pending_status
    ///         = gdk_drag_context_get_suggested_action (context);
    ///      gtk_drag_get_data (widget, context, target, time);
    ///    }
    ///
    ///   return TRUE;
    /// }
    ///
    /// static void
    /// drag_data_received (GtkWidget        *widget,
    ///                     GdkDragContext   *context,
    ///                     gint              x,
    ///                     gint              y,
    ///                     GtkSelectionData *selection_data,
    ///                     guint             info,
    ///                     guint             time)
    /// {
    ///   PrivateData *private_data = GET_PRIVATE_DATA (widget);
    ///
    ///   if (private_data->suggested_action)
    ///    {
    ///      private_data->suggested_action = 0;
    ///
    ///      // We are getting this data due to a request in drag_motion,
    ///      // rather than due to a request in drag_drop, so we are just
    ///      // supposed to call gdk_drag_status(), not actually paste in
    ///      // the data.
    ///
    ///      str = gtk_selection_data_get_text (selection_data);
    ///      if (!data_is_acceptable (str))
    ///        gdk_drag_status (context, 0, time);
    ///      else
    ///        gdk_drag_status (context,
    ///                         private_data->suggested_action,
    ///                         time);
    ///    }
    ///   else
    ///    {
    ///      // accept the drop
    ///    }
    /// }
    /// ```
    ///
    ///
    ///
    ///
    /// #### `draw`
    ///  This signal is emitted when a widget is supposed to render itself.
    /// The `widget`'s top left corner must be painted at the origin of
    /// the passed in context and be sized to the values returned by
    /// [`WidgetExt::allocated_width()`][crate::prelude::WidgetExt::allocated_width()] and
    /// [`WidgetExt::allocated_height()`][crate::prelude::WidgetExt::allocated_height()].
    ///
    /// Signal handlers connected to this signal can modify the cairo
    /// context passed as `cr` in any way they like and don't need to
    /// restore it. The signal emission takes care of calling `cairo_save()`
    /// before and `cairo_restore()` after invoking the handler.
    ///
    /// The signal handler will get a `cr` with a clip region already set to the
    /// widget's dirty region, i.e. to the area that needs repainting. Complicated
    /// widgets that want to avoid redrawing themselves completely can get the full
    /// extents of the clip region with `gdk_cairo_get_clip_rectangle()`, or they can
    /// get a finer-grained representation of the dirty region with
    /// `cairo_copy_clip_rectangle_list()`.
    ///
    ///
    ///
    ///
    /// #### `enter-notify-event`
    ///  The ::enter-notify-event will be emitted when the pointer enters
    /// the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::ENTER_NOTIFY_MASK`][crate::gdk::EventMask::ENTER_NOTIFY_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `event`
    ///  The GTK+ main loop will emit three signals for each GDK event delivered
    /// to a widget: one generic ::event signal, another, more specific,
    /// signal that matches the type of event delivered (e.g.
    /// [`key-press-event`][struct@crate::Widget#key-press-event]) and finally a generic
    /// [`event-after`][struct@crate::Widget#event-after] signal.
    ///
    ///
    ///
    ///
    /// #### `event-after`
    ///  After the emission of the [`event`][struct@crate::Widget#event] signal and (optionally)
    /// the second more specific signal, ::event-after will be emitted
    /// regardless of the previous two signals handlers return values.
    ///
    ///
    ///
    ///
    /// #### `focus`
    ///
    ///
    ///
    /// #### `focus-in-event`
    ///  The ::focus-in-event signal will be emitted when the keyboard focus
    /// enters the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::FOCUS_CHANGE_MASK`][crate::gdk::EventMask::FOCUS_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `focus-out-event`
    ///  The ::focus-out-event signal will be emitted when the keyboard focus
    /// leaves the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::FOCUS_CHANGE_MASK`][crate::gdk::EventMask::FOCUS_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `grab-broken-event`
    ///  Emitted when a pointer or keyboard grab on a window belonging
    /// to `widget` gets broken.
    ///
    /// On X11, this happens when the grab window becomes unviewable
    /// (i.e. it or one of its ancestors is unmapped), or if the same
    /// application grabs the pointer or keyboard again.
    ///
    ///
    ///
    ///
    /// #### `grab-focus`
    ///  Action
    ///
    ///
    /// #### `grab-notify`
    ///  The ::grab-notify signal is emitted when a widget becomes
    /// shadowed by a GTK+ grab (not a pointer or keyboard grab) on
    /// another widget, or when it becomes unshadowed due to a grab
    /// being removed.
    ///
    /// A widget is shadowed by a [`WidgetExt::grab_add()`][crate::prelude::WidgetExt::grab_add()] when the topmost
    /// grab widget in the grab stack of its window group is not
    /// its ancestor.
    ///
    ///
    ///
    ///
    /// #### `hide`
    ///  The ::hide signal is emitted when `widget` is hidden, for example with
    /// [`WidgetExt::hide()`][crate::prelude::WidgetExt::hide()].
    ///
    ///
    ///
    ///
    /// #### `hierarchy-changed`
    ///  The ::hierarchy-changed signal is emitted when the
    /// anchored state of a widget changes. A widget is
    /// “anchored” when its toplevel
    /// ancestor is a [`Window`][crate::Window]. This signal is emitted when
    /// a widget changes from un-anchored to anchored or vice-versa.
    ///
    ///
    ///
    ///
    /// #### `key-press-event`
    ///  The ::key-press-event signal is emitted when a key is pressed. The signal
    /// emission will reoccur at the key-repeat rate when the key is kept pressed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::KEY_PRESS_MASK`][crate::gdk::EventMask::KEY_PRESS_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `key-release-event`
    ///  The ::key-release-event signal is emitted when a key is released.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::KEY_RELEASE_MASK`][crate::gdk::EventMask::KEY_RELEASE_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `keynav-failed`
    ///  Gets emitted if keyboard navigation fails.
    /// See [`WidgetExt::keynav_failed()`][crate::prelude::WidgetExt::keynav_failed()] for details.
    ///
    ///
    ///
    ///
    /// #### `leave-notify-event`
    ///  The ::leave-notify-event will be emitted when the pointer leaves
    /// the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::LEAVE_NOTIFY_MASK`][crate::gdk::EventMask::LEAVE_NOTIFY_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `map`
    ///  The ::map signal is emitted when `widget` is going to be mapped, that is
    /// when the widget is visible (which is controlled with
    /// [`WidgetExt::set_visible()`][crate::prelude::WidgetExt::set_visible()]) and all its parents up to the toplevel widget
    /// are also visible. Once the map has occurred, [`map-event`][struct@crate::Widget#map-event] will
    /// be emitted.
    ///
    /// The ::map signal can be used to determine whether a widget will be drawn,
    /// for instance it can resume an animation that was stopped during the
    /// emission of [`unmap`][struct@crate::Widget#unmap].
    ///
    ///
    ///
    ///
    /// #### `map-event`
    ///  The ::map-event signal will be emitted when the `widget`'s window is
    /// mapped. A window is mapped when it becomes visible on the screen.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `mnemonic-activate`
    ///  The default handler for this signal activates `widget` if `group_cycling`
    /// is [`false`], or just makes `widget` grab focus if `group_cycling` is [`true`].
    ///
    ///
    ///
    ///
    /// #### `motion-notify-event`
    ///  The ::motion-notify-event signal is emitted when the pointer moves
    /// over the widget's [`gdk::Window`][crate::gdk::Window].
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget
    /// needs to enable the [`gdk::EventMask::POINTER_MOTION_MASK`][crate::gdk::EventMask::POINTER_MOTION_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `move-focus`
    ///  Action
    ///
    ///
    /// #### `parent-set`
    ///  The ::parent-set signal is emitted when a new parent
    /// has been set on a widget.
    ///
    ///
    ///
    ///
    /// #### `popup-menu`
    ///  This signal gets emitted whenever a widget should pop up a context
    /// menu. This usually happens through the standard key binding mechanism;
    /// by pressing a certain key while a widget is focused, the user can cause
    /// the widget to pop up a menu. For example, the [`Entry`][crate::Entry] widget creates
    /// a menu with clipboard commands. See the
    /// [Popup Menu Migration Checklist][checklist-popup-menu]
    /// for an example of how to use this signal.
    ///
    /// Action
    ///
    ///
    /// #### `property-notify-event`
    ///  The ::property-notify-event signal will be emitted when a property on
    /// the `widget`'s window has been changed or deleted.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROPERTY_CHANGE_MASK`][crate::gdk::EventMask::PROPERTY_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `proximity-in-event`
    ///  To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROXIMITY_IN_MASK`][crate::gdk::EventMask::PROXIMITY_IN_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `proximity-out-event`
    ///  To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROXIMITY_OUT_MASK`][crate::gdk::EventMask::PROXIMITY_OUT_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `query-tooltip`
    ///  Emitted when [`has-tooltip`][struct@crate::Widget#has-tooltip] is [`true`] and the hover timeout
    /// has expired with the cursor hovering "above" `widget`; or emitted when `widget` got
    /// focus in keyboard mode.
    ///
    /// Using the given coordinates, the signal handler should determine
    /// whether a tooltip should be shown for `widget`. If this is the case
    /// [`true`] should be returned, [`false`] otherwise. Note that if
    /// `keyboard_mode` is [`true`], the values of `x` and `y` are undefined and
    /// should not be used.
    ///
    /// The signal handler is free to manipulate `tooltip` with the therefore
    /// destined function calls.
    ///
    ///
    ///
    ///
    /// #### `realize`
    ///  The ::realize signal is emitted when `widget` is associated with a
    /// [`gdk::Window`][crate::gdk::Window], which means that [`WidgetExt::realize()`][crate::prelude::WidgetExt::realize()] has been called or the
    /// widget has been mapped (that is, it is going to be drawn).
    ///
    ///
    ///
    ///
    /// #### `screen-changed`
    ///  The ::screen-changed signal gets emitted when the
    /// screen of a widget has changed.
    ///
    ///
    ///
    ///
    /// #### `scroll-event`
    ///  The ::scroll-event signal is emitted when a button in the 4 to 7
    /// range is pressed. Wheel mice are usually configured to generate
    /// button press events for buttons 4 and 5 when the wheel is turned.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::SCROLL_MASK`][crate::gdk::EventMask::SCROLL_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `selection-clear-event`
    ///  The ::selection-clear-event signal will be emitted when the
    /// the `widget`'s window has lost ownership of a selection.
    ///
    ///
    ///
    ///
    /// #### `selection-get`
    ///
    ///
    ///
    /// #### `selection-notify-event`
    ///
    ///
    ///
    /// #### `selection-received`
    ///
    ///
    ///
    /// #### `selection-request-event`
    ///  The ::selection-request-event signal will be emitted when
    /// another client requests ownership of the selection owned by
    /// the `widget`'s window.
    ///
    ///
    ///
    ///
    /// #### `show`
    ///  The ::show signal is emitted when `widget` is shown, for example with
    /// [`WidgetExt::show()`][crate::prelude::WidgetExt::show()].
    ///
    ///
    ///
    ///
    /// #### `show-help`
    ///  Action
    ///
    ///
    /// #### `size-allocate`
    ///
    ///
    ///
    /// #### `state-changed`
    ///  The ::state-changed signal is emitted when the widget state changes.
    /// See `gtk_widget_get_state()`.
    ///
    ///
    ///
    ///
    /// #### `state-flags-changed`
    ///  The ::state-flags-changed signal is emitted when the widget state
    /// changes, see [`WidgetExt::state_flags()`][crate::prelude::WidgetExt::state_flags()].
    ///
    ///
    ///
    ///
    /// #### `style-set`
    ///  The ::style-set signal is emitted when a new style has been set
    /// on a widget. Note that style-modifying functions like
    /// `gtk_widget_modify_base()` also cause this signal to be emitted.
    ///
    /// Note that this signal is emitted for changes to the deprecated
    /// `GtkStyle`. To track changes to the [`StyleContext`][crate::StyleContext] associated
    /// with a widget, use the [`style-updated`][struct@crate::Widget#style-updated] signal.
    ///
    ///
    ///
    ///
    /// #### `style-updated`
    ///  The ::style-updated signal is a convenience signal that is emitted when the
    /// [`changed`][struct@crate::StyleContext#changed] signal is emitted on the `widget`'s associated
    /// [`StyleContext`][crate::StyleContext] as returned by [`WidgetExt::style_context()`][crate::prelude::WidgetExt::style_context()].
    ///
    /// Note that style-modifying functions like `gtk_widget_override_color()` also
    /// cause this signal to be emitted.
    ///
    ///
    ///
    ///
    /// #### `touch-event`
    ///
    ///
    ///
    /// #### `unmap`
    ///  The ::unmap signal is emitted when `widget` is going to be unmapped, which
    /// means that either it or any of its parents up to the toplevel widget have
    /// been set as hidden.
    ///
    /// As ::unmap indicates that a widget will not be shown any longer, it can be
    /// used to, for example, stop an animation on the widget.
    ///
    ///
    ///
    ///
    /// #### `unmap-event`
    ///  The ::unmap-event signal will be emitted when the `widget`'s window is
    /// unmapped. A window is unmapped when it becomes invisible on the screen.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `unrealize`
    ///  The ::unrealize signal is emitted when the [`gdk::Window`][crate::gdk::Window] associated with
    /// `widget` is destroyed, which means that [`WidgetExt::unrealize()`][crate::prelude::WidgetExt::unrealize()] has been
    /// called or the widget has been unmapped (that is, it is going to be
    /// hidden).
    ///
    ///
    ///
    ///
    /// #### `visibility-notify-event`
    ///  The ::visibility-notify-event will be emitted when the `widget`'s
    /// window is obscured or unobscured.
    ///
    /// To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::VISIBILITY_NOTIFY_MASK`][crate::gdk::EventMask::VISIBILITY_NOTIFY_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `window-state-event`
    ///  The ::window-state-event will be emitted when the state of the
    /// toplevel window associated to the `widget` changes.
    ///
    /// To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget
    /// needs to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable
    /// this mask automatically for all new windows.
    ///
    ///
    /// </details>
    ///
    /// # Implements
    ///
    /// [`AssistantExt`][trait@crate::prelude::AssistantExt], [`GtkWindowExt`][trait@crate::prelude::GtkWindowExt], [`BinExt`][trait@crate::prelude::BinExt], [`ContainerExt`][trait@crate::prelude::ContainerExt], [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`GtkWindowExtManual`][trait@crate::prelude::GtkWindowExtManual], [`ContainerExtManual`][trait@crate::prelude::ContainerExtManual], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`BuildableExtManual`][trait@crate::prelude::BuildableExtManual]
    #[doc(alias = "GtkAssistant")]
    pub struct Assistant(Object<ffi::GtkAssistant, ffi::GtkAssistantClass>) @extends Window, Bin, Container, Widget, @implements Buildable;

    match fn {
        type_ => || ffi::gtk_assistant_get_type(),
    }
}

impl Assistant {
    pub const NONE: Option<&'static Assistant> = None;

    /// Creates a new [`Assistant`][crate::Assistant].
    ///
    /// # Returns
    ///
    /// a newly created [`Assistant`][crate::Assistant]
    #[doc(alias = "gtk_assistant_new")]
    pub fn new() -> Assistant {
        assert_initialized_main_thread!();
        unsafe { Widget::from_glib_none(ffi::gtk_assistant_new()).unsafe_cast() }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`Assistant`] objects.
    ///
    /// This method returns an instance of [`AssistantBuilder`](crate::builders::AssistantBuilder) which can be used to create [`Assistant`] objects.
    pub fn builder() -> AssistantBuilder {
        AssistantBuilder::new()
    }
}

impl Default for Assistant {
    fn default() -> Self {
        Self::new()
    }
}

// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`Assistant`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct AssistantBuilder {
    builder: glib::object::ObjectBuilder<'static, Assistant>,
}

impl AssistantBuilder {
    fn new() -> Self {
        Self {
            builder: glib::object::Object::builder(),
        }
    }

    /// [`true`] if the assistant uses a [`HeaderBar`][crate::HeaderBar] 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`].
    pub fn use_header_bar(self, use_header_bar: i32) -> Self {
        Self {
            builder: self.builder.property("use-header-bar", use_header_bar),
        }
    }

    /// Whether the window should receive the input focus.
    pub fn accept_focus(self, accept_focus: bool) -> Self {
        Self {
            builder: self.builder.property("accept-focus", accept_focus),
        }
    }

    /// The [`Application`][crate::Application] associated with the window.
    ///
    /// The application will be kept alive for at least as long as it
    /// has any windows associated with it (see [`ApplicationExtManual::hold()`][crate::gio::prelude::ApplicationExtManual::hold()]
    /// for a way to keep it alive without windows).
    ///
    /// Normally, the connection between the application and the window
    /// will remain until the window is destroyed, but you can explicitly
    /// remove it by setting the :application property to [`None`].
    pub fn application(self, application: &impl IsA<Application>) -> Self {
        Self {
            builder: self
                .builder
                .property("application", application.clone().upcast()),
        }
    }

    /// The widget to which this window is attached.
    /// See [`GtkWindowExt::set_attached_to()`][crate::prelude::GtkWindowExt::set_attached_to()].
    ///
    /// Examples of places where specifying this relation is useful are
    /// for instance a [`Menu`][crate::Menu] created by a [`ComboBox`][crate::ComboBox], a completion
    /// popup window created by [`Entry`][crate::Entry] or a typeahead search entry
    /// created by [`TreeView`][crate::TreeView].
    pub fn attached_to(self, attached_to: &impl IsA<Widget>) -> Self {
        Self {
            builder: self
                .builder
                .property("attached-to", attached_to.clone().upcast()),
        }
    }

    /// Whether the window should be decorated by the window manager.
    pub fn decorated(self, decorated: bool) -> Self {
        Self {
            builder: self.builder.property("decorated", decorated),
        }
    }

    pub fn default_height(self, default_height: i32) -> Self {
        Self {
            builder: self.builder.property("default-height", default_height),
        }
    }

    pub fn default_width(self, default_width: i32) -> Self {
        Self {
            builder: self.builder.property("default-width", default_width),
        }
    }

    /// Whether the window frame should have a close button.
    pub fn deletable(self, deletable: bool) -> Self {
        Self {
            builder: self.builder.property("deletable", deletable),
        }
    }

    pub fn destroy_with_parent(self, destroy_with_parent: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("destroy-with-parent", destroy_with_parent),
        }
    }

    /// Whether the window should receive the input focus when mapped.
    pub fn focus_on_map(self, focus_on_map: bool) -> Self {
        Self {
            builder: self.builder.property("focus-on-map", focus_on_map),
        }
    }

    /// Whether 'focus rectangles' are currently visible in this window.
    ///
    /// This property is maintained by GTK+ based on user input
    /// and should not be set by applications.
    pub fn focus_visible(self, focus_visible: bool) -> Self {
        Self {
            builder: self.builder.property("focus-visible", focus_visible),
        }
    }

    /// The window gravity of the window. See [`GtkWindowExt::move_()`][crate::prelude::GtkWindowExt::move_()] and [`gdk::Gravity`][crate::gdk::Gravity] for
    /// more details about window gravity.
    pub fn gravity(self, gravity: gdk::Gravity) -> Self {
        Self {
            builder: self.builder.property("gravity", gravity),
        }
    }

    /// Whether the titlebar should be hidden during maximization.
    pub fn hide_titlebar_when_maximized(self, hide_titlebar_when_maximized: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("hide-titlebar-when-maximized", hide_titlebar_when_maximized),
        }
    }

    pub fn icon(self, icon: &gdk_pixbuf::Pixbuf) -> Self {
        Self {
            builder: self.builder.property("icon", icon.clone()),
        }
    }

    /// The :icon-name property specifies the name of the themed icon to
    /// use as the window icon. See [`IconTheme`][crate::IconTheme] for more details.
    pub fn icon_name(self, icon_name: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("icon-name", icon_name.into()),
        }
    }

    /// Whether mnemonics are currently visible in this window.
    ///
    /// This property is maintained by GTK+ based on user input,
    /// and should not be set by applications.
    pub fn mnemonics_visible(self, mnemonics_visible: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("mnemonics-visible", mnemonics_visible),
        }
    }

    pub fn modal(self, modal: bool) -> Self {
        Self {
            builder: self.builder.property("modal", modal),
        }
    }

    pub fn resizable(self, resizable: bool) -> Self {
        Self {
            builder: self.builder.property("resizable", resizable),
        }
    }

    pub fn role(self, role: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("role", role.into()),
        }
    }

    pub fn screen(self, screen: &gdk::Screen) -> Self {
        Self {
            builder: self.builder.property("screen", screen.clone()),
        }
    }

    pub fn skip_pager_hint(self, skip_pager_hint: bool) -> Self {
        Self {
            builder: self.builder.property("skip-pager-hint", skip_pager_hint),
        }
    }

    pub fn skip_taskbar_hint(self, skip_taskbar_hint: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("skip-taskbar-hint", skip_taskbar_hint),
        }
    }

    /// The :startup-id is a write-only property for setting window's
    /// startup notification identifier. See [`GtkWindowExt::set_startup_id()`][crate::prelude::GtkWindowExt::set_startup_id()]
    /// for more details.
    pub fn startup_id(self, startup_id: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("startup-id", startup_id.into()),
        }
    }

    pub fn title(self, title: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("title", title.into()),
        }
    }

    /// The transient parent of the window. See [`GtkWindowExt::set_transient_for()`][crate::prelude::GtkWindowExt::set_transient_for()] for
    /// more details about transient windows.
    pub fn transient_for(self, transient_for: &impl IsA<Window>) -> Self {
        Self {
            builder: self
                .builder
                .property("transient-for", transient_for.clone().upcast()),
        }
    }

    pub fn type_(self, type_: WindowType) -> Self {
        Self {
            builder: self.builder.property("type", type_),
        }
    }

    pub fn type_hint(self, type_hint: gdk::WindowTypeHint) -> Self {
        Self {
            builder: self.builder.property("type-hint", type_hint),
        }
    }

    pub fn urgency_hint(self, urgency_hint: bool) -> Self {
        Self {
            builder: self.builder.property("urgency-hint", urgency_hint),
        }
    }

    pub fn window_position(self, window_position: WindowPosition) -> Self {
        Self {
            builder: self.builder.property("window-position", window_position),
        }
    }

    pub fn border_width(self, border_width: u32) -> Self {
        Self {
            builder: self.builder.property("border-width", border_width),
        }
    }

    pub fn child(self, child: &impl IsA<Widget>) -> Self {
        Self {
            builder: self.builder.property("child", child.clone().upcast()),
        }
    }

    pub fn resize_mode(self, resize_mode: ResizeMode) -> Self {
        Self {
            builder: self.builder.property("resize-mode", resize_mode),
        }
    }

    pub fn app_paintable(self, app_paintable: bool) -> Self {
        Self {
            builder: self.builder.property("app-paintable", app_paintable),
        }
    }

    pub fn can_default(self, can_default: bool) -> Self {
        Self {
            builder: self.builder.property("can-default", can_default),
        }
    }

    pub fn can_focus(self, can_focus: bool) -> Self {
        Self {
            builder: self.builder.property("can-focus", can_focus),
        }
    }

    pub fn events(self, events: gdk::EventMask) -> Self {
        Self {
            builder: self.builder.property("events", events),
        }
    }

    /// Whether to expand in both directions. Setting this sets both [`hexpand`][struct@crate::Widget#hexpand] and [`vexpand`][struct@crate::Widget#vexpand]
    pub fn expand(self, expand: bool) -> Self {
        Self {
            builder: self.builder.property("expand", expand),
        }
    }

    /// Whether the widget should grab focus when it is clicked with the mouse.
    ///
    /// This property is only relevant for widgets that can take focus.
    ///
    /// Before 3.20, several widgets (GtkButton, GtkFileChooserButton,
    /// GtkComboBox) implemented this property individually.
    pub fn focus_on_click(self, focus_on_click: bool) -> Self {
        Self {
            builder: self.builder.property("focus-on-click", focus_on_click),
        }
    }

    /// How to distribute horizontal space if widget gets extra space, see [`Align`][crate::Align]
    pub fn halign(self, halign: Align) -> Self {
        Self {
            builder: self.builder.property("halign", halign),
        }
    }

    pub fn has_default(self, has_default: bool) -> Self {
        Self {
            builder: self.builder.property("has-default", has_default),
        }
    }

    pub fn has_focus(self, has_focus: bool) -> Self {
        Self {
            builder: self.builder.property("has-focus", has_focus),
        }
    }

    /// Enables or disables the emission of [`query-tooltip`][struct@crate::Widget#query-tooltip] on `widget`.
    /// A value of [`true`] indicates that `widget` can have a tooltip, in this case
    /// the widget will be queried using [`query-tooltip`][struct@crate::Widget#query-tooltip] to determine
    /// whether it will provide a tooltip or not.
    ///
    /// Note that setting this property to [`true`] for the first time will change
    /// the event masks of the GdkWindows of this widget to include leave-notify
    /// and motion-notify events. This cannot and will not be undone when the
    /// property is set to [`false`] again.
    pub fn has_tooltip(self, has_tooltip: bool) -> Self {
        Self {
            builder: self.builder.property("has-tooltip", has_tooltip),
        }
    }

    pub fn height_request(self, height_request: i32) -> Self {
        Self {
            builder: self.builder.property("height-request", height_request),
        }
    }

    /// Whether to expand horizontally. See [`WidgetExt::set_hexpand()`][crate::prelude::WidgetExt::set_hexpand()].
    pub fn hexpand(self, hexpand: bool) -> Self {
        Self {
            builder: self.builder.property("hexpand", hexpand),
        }
    }

    /// Whether to use the [`hexpand`][struct@crate::Widget#hexpand] property. See [`WidgetExt::is_hexpand_set()`][crate::prelude::WidgetExt::is_hexpand_set()].
    pub fn hexpand_set(self, hexpand_set: bool) -> Self {
        Self {
            builder: self.builder.property("hexpand-set", hexpand_set),
        }
    }

    pub fn is_focus(self, is_focus: bool) -> Self {
        Self {
            builder: self.builder.property("is-focus", is_focus),
        }
    }

    /// Sets all four sides' margin at once. If read, returns max
    /// margin on any side.
    pub fn margin(self, margin: i32) -> Self {
        Self {
            builder: self.builder.property("margin", margin),
        }
    }

    /// Margin on bottom side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    pub fn margin_bottom(self, margin_bottom: i32) -> Self {
        Self {
            builder: self.builder.property("margin-bottom", margin_bottom),
        }
    }

    /// Margin on end of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    pub fn margin_end(self, margin_end: i32) -> Self {
        Self {
            builder: self.builder.property("margin-end", margin_end),
        }
    }

    /// Margin on start of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    pub fn margin_start(self, margin_start: i32) -> Self {
        Self {
            builder: self.builder.property("margin-start", margin_start),
        }
    }

    /// Margin on top side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    pub fn margin_top(self, margin_top: i32) -> Self {
        Self {
            builder: self.builder.property("margin-top", margin_top),
        }
    }

    pub fn name(self, name: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("name", name.into()),
        }
    }

    pub fn no_show_all(self, no_show_all: bool) -> Self {
        Self {
            builder: self.builder.property("no-show-all", no_show_all),
        }
    }

    /// The requested opacity of the widget. See [`WidgetExt::set_opacity()`][crate::prelude::WidgetExt::set_opacity()] for
    /// more details about window opacity.
    ///
    /// Before 3.8 this was only available in GtkWindow
    pub fn opacity(self, opacity: f64) -> Self {
        Self {
            builder: self.builder.property("opacity", opacity),
        }
    }

    pub fn parent(self, parent: &impl IsA<Container>) -> Self {
        Self {
            builder: self.builder.property("parent", parent.clone().upcast()),
        }
    }

    pub fn receives_default(self, receives_default: bool) -> Self {
        Self {
            builder: self.builder.property("receives-default", receives_default),
        }
    }

    pub fn sensitive(self, sensitive: bool) -> Self {
        Self {
            builder: self.builder.property("sensitive", sensitive),
        }
    }

    /// Sets the text of tooltip to be the given string, which is marked up
    /// with the [Pango text markup language][PangoMarkupFormat].
    /// Also see [`Tooltip::set_markup()`][crate::Tooltip::set_markup()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    pub fn tooltip_markup(self, tooltip_markup: impl Into<glib::GString>) -> Self {
        Self {
            builder: self
                .builder
                .property("tooltip-markup", tooltip_markup.into()),
        }
    }

    /// Sets the text of tooltip to be the given string.
    ///
    /// Also see [`Tooltip::set_text()`][crate::Tooltip::set_text()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    pub fn tooltip_text(self, tooltip_text: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("tooltip-text", tooltip_text.into()),
        }
    }

    /// How to distribute vertical space if widget gets extra space, see [`Align`][crate::Align]
    pub fn valign(self, valign: Align) -> Self {
        Self {
            builder: self.builder.property("valign", valign),
        }
    }

    /// Whether to expand vertically. See [`WidgetExt::set_vexpand()`][crate::prelude::WidgetExt::set_vexpand()].
    pub fn vexpand(self, vexpand: bool) -> Self {
        Self {
            builder: self.builder.property("vexpand", vexpand),
        }
    }

    /// Whether to use the [`vexpand`][struct@crate::Widget#vexpand] property. See [`WidgetExt::is_vexpand_set()`][crate::prelude::WidgetExt::is_vexpand_set()].
    pub fn vexpand_set(self, vexpand_set: bool) -> Self {
        Self {
            builder: self.builder.property("vexpand-set", vexpand_set),
        }
    }

    pub fn visible(self, visible: bool) -> Self {
        Self {
            builder: self.builder.property("visible", visible),
        }
    }

    pub fn width_request(self, width_request: i32) -> Self {
        Self {
            builder: self.builder.property("width-request", width_request),
        }
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`Assistant`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> Assistant {
        assert_initialized_main_thread!();
        self.builder.build()
    }
}

/// Trait containing all [`struct@Assistant`] methods.
///
/// # Implementors
///
/// [`Assistant`][struct@crate::Assistant]
pub trait AssistantExt: IsA<Assistant> + 'static {
    /// Adds a widget to the action area of a [`Assistant`][crate::Assistant].
    /// ## `child`
    /// a [`Widget`][crate::Widget]
    #[doc(alias = "gtk_assistant_add_action_widget")]
    fn add_action_widget(&self, child: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_assistant_add_action_widget(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
            );
        }
    }

    /// Appends a page to the `self`.
    /// ## `page`
    /// a [`Widget`][crate::Widget]
    ///
    /// # Returns
    ///
    /// the index (starting at 0) of the inserted page
    #[doc(alias = "gtk_assistant_append_page")]
    fn append_page(&self, page: &impl IsA<Widget>) -> i32 {
        unsafe {
            ffi::gtk_assistant_append_page(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            )
        }
    }

    /// 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.
    #[doc(alias = "gtk_assistant_commit")]
    fn commit(&self) {
        unsafe {
            ffi::gtk_assistant_commit(self.as_ref().to_glib_none().0);
        }
    }

    /// Returns the page number of the current page.
    ///
    /// # Returns
    ///
    /// The index (starting from 0) of the current
    ///  page in the `self`, or -1 if the `self` has no pages,
    ///  or no current page.
    #[doc(alias = "gtk_assistant_get_current_page")]
    #[doc(alias = "get_current_page")]
    fn current_page(&self) -> i32 {
        unsafe { ffi::gtk_assistant_get_current_page(self.as_ref().to_glib_none().0) }
    }

    /// Returns the number of pages in the `self`
    ///
    /// # Returns
    ///
    /// the number of pages in the `self`
    #[doc(alias = "gtk_assistant_get_n_pages")]
    #[doc(alias = "get_n_pages")]
    fn n_pages(&self) -> i32 {
        unsafe { ffi::gtk_assistant_get_n_pages(self.as_ref().to_glib_none().0) }
    }

    /// Returns the child widget contained in page number `page_num`.
    /// ## `page_num`
    /// the index of a page in the `self`,
    ///  or -1 to get the last page
    ///
    /// # Returns
    ///
    /// the child widget, or [`None`]
    ///  if `page_num` is out of bounds
    #[doc(alias = "gtk_assistant_get_nth_page")]
    #[doc(alias = "get_nth_page")]
    fn nth_page(&self, page_num: i32) -> Option<Widget> {
        unsafe {
            from_glib_none(ffi::gtk_assistant_get_nth_page(
                self.as_ref().to_glib_none().0,
                page_num,
            ))
        }
    }

    /// Gets whether `page` is complete.
    /// ## `page`
    /// a page of `self`
    ///
    /// # Returns
    ///
    /// [`true`] if `page` is complete.
    #[doc(alias = "gtk_assistant_get_page_complete")]
    #[doc(alias = "get_page_complete")]
    fn page_is_complete(&self, page: &impl IsA<Widget>) -> bool {
        unsafe {
            from_glib(ffi::gtk_assistant_get_page_complete(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets whether page has padding.
    /// ## `page`
    /// a page of `self`
    ///
    /// # Returns
    ///
    /// [`true`] if `page` has padding
    #[doc(alias = "gtk_assistant_get_page_has_padding")]
    #[doc(alias = "get_page_has_padding")]
    fn page_has_padding(&self, page: &impl IsA<Widget>) -> bool {
        unsafe {
            from_glib(ffi::gtk_assistant_get_page_has_padding(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets the title for `page`.
    /// ## `page`
    /// a page of `self`
    ///
    /// # Returns
    ///
    /// the title for `page`
    #[doc(alias = "gtk_assistant_get_page_title")]
    #[doc(alias = "get_page_title")]
    fn page_title(&self, page: &impl IsA<Widget>) -> Option<glib::GString> {
        unsafe {
            from_glib_none(ffi::gtk_assistant_get_page_title(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets the page type of `page`.
    /// ## `page`
    /// a page of `self`
    ///
    /// # Returns
    ///
    /// the page type of `page`
    #[doc(alias = "gtk_assistant_get_page_type")]
    #[doc(alias = "get_page_type")]
    fn page_type(&self, page: &impl IsA<Widget>) -> AssistantPageType {
        unsafe {
            from_glib(ffi::gtk_assistant_get_page_type(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Inserts a page in the `self` at a given position.
    /// ## `page`
    /// a [`Widget`][crate::Widget]
    /// ## `position`
    /// the index (starting at 0) at which to insert the page,
    ///  or -1 to append the page to the `self`
    ///
    /// # Returns
    ///
    /// the index (starting from 0) of the inserted page
    #[doc(alias = "gtk_assistant_insert_page")]
    fn insert_page(&self, page: &impl IsA<Widget>, position: i32) -> i32 {
        unsafe {
            ffi::gtk_assistant_insert_page(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
                position,
            )
        }
    }

    /// 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
    /// [`AssistantPageType::Custom`][crate::AssistantPageType::Custom] type.
    #[doc(alias = "gtk_assistant_next_page")]
    fn next_page(&self) {
        unsafe {
            ffi::gtk_assistant_next_page(self.as_ref().to_glib_none().0);
        }
    }

    /// Prepends a page to the `self`.
    /// ## `page`
    /// a [`Widget`][crate::Widget]
    ///
    /// # Returns
    ///
    /// the index (starting at 0) of the inserted page
    #[doc(alias = "gtk_assistant_prepend_page")]
    fn prepend_page(&self, page: &impl IsA<Widget>) -> i32 {
        unsafe {
            ffi::gtk_assistant_prepend_page(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
            )
        }
    }

    /// 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
    /// [`AssistantPageType::Custom`][crate::AssistantPageType::Custom] type.
    #[doc(alias = "gtk_assistant_previous_page")]
    fn previous_page(&self) {
        unsafe {
            ffi::gtk_assistant_previous_page(self.as_ref().to_glib_none().0);
        }
    }

    /// Removes a widget from the action area of a [`Assistant`][crate::Assistant].
    /// ## `child`
    /// a [`Widget`][crate::Widget]
    #[doc(alias = "gtk_assistant_remove_action_widget")]
    fn remove_action_widget(&self, child: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_assistant_remove_action_widget(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
            );
        }
    }

    /// Removes the `page_num`’s page from `self`.
    /// ## `page_num`
    /// the index of a page in the `self`,
    ///  or -1 to remove the last page
    #[doc(alias = "gtk_assistant_remove_page")]
    fn remove_page(&self, page_num: i32) {
        unsafe {
            ffi::gtk_assistant_remove_page(self.as_ref().to_glib_none().0, page_num);
        }
    }

    /// Switches the page to `page_num`.
    ///
    /// Note that this will only be necessary in custom buttons,
    /// as the `self` flow can be set with
    /// [`set_forward_page_func()`][Self::set_forward_page_func()].
    /// ## `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 `self`, nothing
    ///  will be done.
    #[doc(alias = "gtk_assistant_set_current_page")]
    fn set_current_page(&self, page_num: i32) {
        unsafe {
            ffi::gtk_assistant_set_current_page(self.as_ref().to_glib_none().0, page_num);
        }
    }

    /// 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 [`None`] will make the assistant to
    /// use the default forward function, which just goes to the
    /// next visible page.
    /// ## `page_func`
    /// the `GtkAssistantPageFunc`, or [`None`]
    ///  to use the default one
    #[doc(alias = "gtk_assistant_set_forward_page_func")]
    fn set_forward_page_func(&self, page_func: Option<Box_<dyn Fn(i32) -> i32 + 'static>>) {
        let page_func_data: Box_<Option<Box_<dyn Fn(i32) -> i32 + 'static>>> = Box_::new(page_func);
        unsafe extern "C" fn page_func_func(
            current_page: std::ffi::c_int,
            data: glib::ffi::gpointer,
        ) -> std::ffi::c_int {
            unsafe {
                let callback = &*(data as *mut Option<Box_<dyn Fn(i32) -> i32 + 'static>>);
                if let Some(ref callback) = *callback {
                    callback(current_page)
                } else {
                    panic!("cannot get closure...")
                }
            }
        }
        let page_func = if page_func_data.is_some() {
            Some(page_func_func as _)
        } else {
            None
        };
        unsafe extern "C" fn destroy_func(data: glib::ffi::gpointer) {
            unsafe {
                let _callback =
                    Box_::from_raw(data as *mut Option<Box_<dyn Fn(i32) -> i32 + 'static>>);
            }
        }
        let destroy_call3 = Some(destroy_func as _);
        let super_callback0: Box_<Option<Box_<dyn Fn(i32) -> i32 + 'static>>> = page_func_data;
        unsafe {
            ffi::gtk_assistant_set_forward_page_func(
                self.as_ref().to_glib_none().0,
                page_func,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call3,
            );
        }
    }

    /// Sets whether `page` contents are complete.
    ///
    /// This will make `self` update the buttons state
    /// to be able to continue the task.
    /// ## `page`
    /// a page of `self`
    /// ## `complete`
    /// the completeness status of the page
    #[doc(alias = "gtk_assistant_set_page_complete")]
    fn set_page_complete(&self, page: &impl IsA<Widget>, complete: bool) {
        unsafe {
            ffi::gtk_assistant_set_page_complete(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
                complete.into_glib(),
            );
        }
    }

    /// Sets whether the assistant is adding padding around
    /// the page.
    /// ## `page`
    /// a page of `self`
    /// ## `has_padding`
    /// whether this page has padding
    #[doc(alias = "gtk_assistant_set_page_has_padding")]
    fn set_page_has_padding(&self, page: &impl IsA<Widget>, has_padding: bool) {
        unsafe {
            ffi::gtk_assistant_set_page_has_padding(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
                has_padding.into_glib(),
            );
        }
    }

    /// Sets a title for `page`.
    ///
    /// The title is displayed in the header area of the assistant
    /// when `page` is the current page.
    /// ## `page`
    /// a page of `self`
    /// ## `title`
    /// the new title for `page`
    #[doc(alias = "gtk_assistant_set_page_title")]
    fn set_page_title(&self, page: &impl IsA<Widget>, title: &str) {
        unsafe {
            ffi::gtk_assistant_set_page_title(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
                title.to_glib_none().0,
            );
        }
    }

    /// Sets the page type for `page`.
    ///
    /// The page type determines the page behavior in the `self`.
    /// ## `page`
    /// a page of `self`
    /// ## `type_`
    /// the new type for `page`
    #[doc(alias = "gtk_assistant_set_page_type")]
    fn set_page_type(&self, page: &impl IsA<Widget>, type_: AssistantPageType) {
        unsafe {
            ffi::gtk_assistant_set_page_type(
                self.as_ref().to_glib_none().0,
                page.as_ref().to_glib_none().0,
                type_.into_glib(),
            );
        }
    }

    /// Forces `self` 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.
    #[doc(alias = "gtk_assistant_update_buttons_state")]
    fn update_buttons_state(&self) {
        unsafe {
            ffi::gtk_assistant_update_buttons_state(self.as_ref().to_glib_none().0);
        }
    }

    /// [`true`] if the assistant uses a [`HeaderBar`][crate::HeaderBar] 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`].
    #[doc(alias = "use-header-bar")]
    fn use_header_bar(&self) -> i32 {
        ObjectExt::property(self.as_ref(), "use-header-bar")
    }

    fn child_is_complete<T: IsA<crate::Widget>>(&self, item: &T) -> bool {
        crate::prelude::ContainerExtManual::child_property(
            self.as_ref(),
            &item.clone().upcast(),
            "complete",
        )
    }

    fn set_child_complete<T: IsA<crate::Widget>>(&self, item: &T, complete: bool) {
        crate::prelude::ContainerExtManual::child_set_property(
            self.as_ref(),
            &item.clone().upcast(),
            "complete",
            &complete,
        )
    }

    #[doc(alias = "child.has-padding")]
    fn child_has_padding<T: IsA<crate::Widget>>(&self, item: &T) -> bool {
        crate::prelude::ContainerExtManual::child_property(
            self.as_ref(),
            &item.clone().upcast(),
            "has-padding",
        )
    }

    #[doc(alias = "child.has-padding")]
    fn set_child_has_padding<T: IsA<crate::Widget>>(&self, item: &T, has_padding: bool) {
        crate::prelude::ContainerExtManual::child_set_property(
            self.as_ref(),
            &item.clone().upcast(),
            "has-padding",
            &has_padding,
        )
    }

    #[doc(alias = "child.page-type")]
    fn child_page_type<T: IsA<crate::Widget>>(&self, item: &T) -> AssistantPageType {
        crate::prelude::ContainerExtManual::child_property(
            self.as_ref(),
            &item.clone().upcast(),
            "page-type",
        )
    }

    #[doc(alias = "child.page-type")]
    fn set_child_page_type<T: IsA<crate::Widget>>(&self, item: &T, page_type: AssistantPageType) {
        crate::prelude::ContainerExtManual::child_set_property(
            self.as_ref(),
            &item.clone().upcast(),
            "page-type",
            &page_type,
        )
    }

    fn child_title<T: IsA<crate::Widget>>(&self, item: &T) -> Option<glib::GString> {
        crate::prelude::ContainerExtManual::child_property(
            self.as_ref(),
            &item.clone().upcast(),
            "title",
        )
    }

    fn set_child_title<T: IsA<crate::Widget>>(&self, item: &T, title: Option<&str>) {
        crate::prelude::ContainerExtManual::child_set_property(
            self.as_ref(),
            &item.clone().upcast(),
            "title",
            &title,
        )
    }

    /// The ::apply signal is emitted when the apply button is clicked.
    ///
    /// The default behavior of the [`Assistant`][crate::Assistant] 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
    /// [`AssistantPageType::Progress`][crate::AssistantPageType::Progress] after the confirmation page and handle
    /// this operation within the [`prepare`][struct@crate::Assistant#prepare] signal of the progress
    /// page.
    #[doc(alias = "apply")]
    fn connect_apply<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn apply_trampoline<P: IsA<Assistant>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkAssistant,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(Assistant::from_glib_borrow(this).unsafe_cast_ref())
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"apply".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    apply_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// The ::cancel signal is emitted when then the cancel button is clicked.
    #[doc(alias = "cancel")]
    fn connect_cancel<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn cancel_trampoline<P: IsA<Assistant>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkAssistant,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(Assistant::from_glib_borrow(this).unsafe_cast_ref())
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"cancel".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    cancel_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// 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 [`AssistantPageType::Confirm`][crate::AssistantPageType::Confirm]) is clicked.
    #[doc(alias = "close")]
    fn connect_close<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn close_trampoline<P: IsA<Assistant>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkAssistant,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(Assistant::from_glib_borrow(this).unsafe_cast_ref())
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"close".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    close_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "escape")]
    fn connect_escape<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn escape_trampoline<P: IsA<Assistant>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkAssistant,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(Assistant::from_glib_borrow(this).unsafe_cast_ref())
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"escape".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    escape_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_escape(&self) {
        self.emit_by_name::<()>("escape", &[]);
    }

    /// 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`.
    /// ## `page`
    /// the current page
    #[doc(alias = "prepare")]
    fn connect_prepare<F: Fn(&Self, &Widget) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn prepare_trampoline<P: IsA<Assistant>, F: Fn(&P, &Widget) + 'static>(
            this: *mut ffi::GtkAssistant,
            page: *mut ffi::GtkWidget,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(
                    Assistant::from_glib_borrow(this).unsafe_cast_ref(),
                    &from_glib_borrow(page),
                )
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"prepare".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    prepare_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl<O: IsA<Assistant>> AssistantExt for O {}