gtk/auto/

container.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
#![allow(deprecated)]

use crate::{Adjustment, Buildable, ResizeMode, Widget, WidgetPath, ffi};
use glib::{
    object::ObjectType as _,
    prelude::*,
    signal::{SignalHandlerId, connect_raw},
    translate::*,
};
use std::boxed::Box as Box_;

glib::wrapper! {
    /// A GTK+ user interface is constructed by nesting widgets inside widgets.
    /// Container widgets are the inner nodes in the resulting tree of widgets:
    /// they contain other widgets. So, for example, you might have a [`Window`][crate::Window]
    /// containing a [`Frame`][crate::Frame] containing a [`Label`][crate::Label]. If you wanted an image instead
    /// of a textual label inside the frame, you might replace the [`Label`][crate::Label] widget
    /// with a [`Image`][crate::Image] widget.
    ///
    /// There are two major kinds of container widgets in GTK+. Both are subclasses
    /// of the abstract GtkContainer base class.
    ///
    /// The first type of container widget has a single child widget and derives
    /// from [`Bin`][crate::Bin]. These containers are decorators, which
    /// add some kind of functionality to the child. For example, a [`Button`][crate::Button] makes
    /// its child into a clickable button; a [`Frame`][crate::Frame] draws a frame around its child
    /// and a [`Window`][crate::Window] places its child widget inside a top-level window.
    ///
    /// The second type of container can have more than one child; its purpose is to
    /// manage layout. This means that these containers assign
    /// sizes and positions to their children. For example, a `GtkHBox` arranges its
    /// children in a horizontal row, and a [`Grid`][crate::Grid] arranges the widgets it contains
    /// in a two-dimensional grid.
    ///
    /// For implementations of [`Container`][crate::Container] the virtual method `GtkContainerClass.forall()`
    /// is always required, since it's used for drawing and other internal operations
    /// on the children.
    /// If the [`Container`][crate::Container] implementation expect to have non internal children
    /// it's needed to implement both `GtkContainerClass.add()` and `GtkContainerClass.remove()`.
    /// If the GtkContainer implementation has internal children, they should be added
    /// with [`WidgetExt::set_parent()`][crate::prelude::WidgetExt::set_parent()] on `init()` and removed with [`WidgetExt::unparent()`][crate::prelude::WidgetExt::unparent()]
    /// in the `GtkWidgetClass.destroy()` implementation.
    /// See more about implementing custom widgets at https://wiki.gnome.org/HowDoI/CustomWidgets
    ///
    /// # Height for width geometry management
    ///
    /// GTK+ uses a height-for-width (and width-for-height) geometry management system.
    /// Height-for-width means that a widget can change how much vertical space it needs,
    /// depending on the amount of horizontal space that it is given (and similar for
    /// width-for-height).
    ///
    /// There are some things to keep in mind when implementing container widgets
    /// that make use of GTK+’s height for width geometry management system. First,
    /// it’s important to note that a container must prioritize one of its
    /// dimensions, that is to say that a widget or container can only have a
    /// [`SizeRequestMode`][crate::SizeRequestMode] that is [`SizeRequestMode::HeightForWidth`][crate::SizeRequestMode::HeightForWidth] or
    /// [`SizeRequestMode::WidthForHeight`][crate::SizeRequestMode::WidthForHeight]. However, every widget and container
    /// must be able to respond to the APIs for both dimensions, i.e. even if a
    /// widget has a request mode that is height-for-width, it is possible that
    /// its parent will request its sizes using the width-for-height APIs.
    ///
    /// To ensure that everything works properly, here are some guidelines to follow
    /// when implementing height-for-width (or width-for-height) containers.
    ///
    /// Each request mode involves 2 virtual methods. Height-for-width apis run
    /// through [`WidgetExt::preferred_width()`][crate::prelude::WidgetExt::preferred_width()] and then through [`WidgetExt::preferred_height_for_width()`][crate::prelude::WidgetExt::preferred_height_for_width()].
    /// When handling requests in the opposite [`SizeRequestMode`][crate::SizeRequestMode] it is important that
    /// every widget request at least enough space to display all of its content at all times.
    ///
    /// When [`WidgetExt::preferred_height()`][crate::prelude::WidgetExt::preferred_height()] is called on a container that is height-for-width,
    /// the container must return the height for its minimum width. This is easily achieved by
    /// simply calling the reverse apis implemented for itself as follows:
    ///
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// static void
    /// foo_container_get_preferred_height (GtkWidget *widget,
    ///                                     gint *min_height,
    ///                                     gint *nat_height)
    /// {
    ///    if (i_am_in_height_for_width_mode)
    ///      {
    ///        gint min_width;
    ///
    ///        GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget,
    ///                                                            &min_width,
    ///                                                            NULL);
    ///        GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width
    ///                                                           (widget,
    ///                                                            min_width,
    ///                                                            min_height,
    ///                                                            nat_height);
    ///      }
    ///    else
    ///      {
    ///        ... many containers support both request modes, execute the
    ///        real width-for-height request here by returning the
    ///        collective heights of all widgets that are stacked
    ///        vertically (or whatever is appropriate for this container)
    ///        ...
    ///      }
    /// }
    /// ```
    ///
    /// Similarly, when [`WidgetExt::preferred_width_for_height()`][crate::prelude::WidgetExt::preferred_width_for_height()] is called for a container or widget
    /// that is height-for-width, it then only needs to return the base minimum width like so:
    ///
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// static void
    /// foo_container_get_preferred_width_for_height (GtkWidget *widget,
    ///                                               gint for_height,
    ///                                               gint *min_width,
    ///                                               gint *nat_width)
    /// {
    ///    if (i_am_in_height_for_width_mode)
    ///      {
    ///        GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget,
    ///                                                            min_width,
    ///                                                            nat_width);
    ///      }
    ///    else
    ///      {
    ///        ... execute the real width-for-height request here based on
    ///        the required width of the children collectively if the
    ///        container were to be allocated the said height ...
    ///      }
    /// }
    /// ```
    ///
    /// Height for width requests are generally implemented in terms of a virtual allocation
    /// of widgets in the input orientation. Assuming an height-for-width request mode, a container
    /// would implement the `get_preferred_height_for_width()` virtual function by first calling
    /// [`WidgetExt::preferred_width()`][crate::prelude::WidgetExt::preferred_width()] for each of its children.
    ///
    /// For each potential group of children that are lined up horizontally, the values returned by
    /// [`WidgetExt::preferred_width()`][crate::prelude::WidgetExt::preferred_width()] should be collected in an array of `GtkRequestedSize` structures.
    /// Any child spacing should be removed from the input `for_width` and then the collective size should be
    /// allocated using the `gtk_distribute_natural_allocation()` convenience function.
    ///
    /// The container will then move on to request the preferred height for each child by using
    /// [`WidgetExt::preferred_height_for_width()`][crate::prelude::WidgetExt::preferred_height_for_width()] and using the sizes stored in the `GtkRequestedSize` array.
    ///
    /// To allocate a height-for-width container, it’s again important
    /// to consider that a container must prioritize one dimension over the other. So if
    /// a container is a height-for-width container it must first allocate all widgets horizontally
    /// using a `GtkRequestedSize` array and `gtk_distribute_natural_allocation()` and then add any
    /// extra space (if and where appropriate) for the widget to expand.
    ///
    /// After adding all the expand space, the container assumes it was allocated sufficient
    /// height to fit all of its content. At this time, the container must use the total horizontal sizes
    /// of each widget to request the height-for-width of each of its children and store the requests in a
    /// `GtkRequestedSize` array for any widgets that stack vertically (for tabular containers this can
    /// be generalized into the heights and widths of rows and columns).
    /// The vertical space must then again be distributed using `gtk_distribute_natural_allocation()`
    /// while this time considering the allocated height of the widget minus any vertical spacing
    /// that the container adds. Then vertical expand space should be added where appropriate and available
    /// and the container should go on to actually allocating the child widgets.
    ///
    /// See [GtkWidget’s geometry management section][geometry-management]
    /// to learn more about implementing height-for-width geometry management for widgets.
    ///
    /// # Child properties
    ///
    /// GtkContainer introduces child properties.
    /// These are object properties that are not specific
    /// to either the container or the contained widget, but rather to their relation.
    /// Typical examples of child properties are the position or pack-type of a widget
    /// which is contained in a [`Box`][crate::Box].
    ///
    /// Use `gtk_container_class_install_child_property()` to install child properties
    /// for a container class and `gtk_container_class_find_child_property()` or
    /// `gtk_container_class_list_child_properties()` to get information about existing
    /// child properties.
    ///
    /// To set the value of a child property, use [`ContainerExtManual::child_set_property()`][crate::prelude::ContainerExtManual::child_set_property()],
    /// `gtk_container_child_set()` or `gtk_container_child_set_valist()`.
    /// To obtain the value of a child property, use
    /// [`ContainerExtManual::child_get_property()`][crate::prelude::ContainerExtManual::child_get_property()], `gtk_container_child_get()` or
    /// `gtk_container_child_get_valist()`. To emit notification about child property
    /// changes, use [`WidgetExt::child_notify()`][crate::prelude::WidgetExt::child_notify()].
    ///
    /// # GtkContainer as GtkBuildable
    ///
    /// The GtkContainer implementation of the GtkBuildable interface supports
    /// a ``<packing>`` element for children, which can contain multiple ``<property>``
    /// elements that specify child properties for the child.
    ///
    /// Since 2.16, child properties can also be marked as translatable using
    /// the same “translatable”, “comments” and “context” attributes that are used
    /// for regular properties.
    ///
    /// Since 3.16, containers can have a ``<focus-chain>`` element containing multiple
    /// ``<widget>`` elements, one for each child that should be added to the focus
    /// chain. The ”name” attribute gives the id of the widget.
    ///
    /// An example of these properties in UI definitions:
    ///
    ///
    ///
    /// **⚠️ The following code is in xml ⚠️**
    ///
    /// ```xml
    /// <object class="GtkBox">
    ///   <child>
    ///     <object class="GtkEntry" id="entry1"/>
    ///     <packing>
    ///       <property name="pack-type">start</property>
    ///     </packing>
    ///   </child>
    ///   <child>
    ///     <object class="GtkEntry" id="entry2"/>
    ///   </child>
    ///   <focus-chain>
    ///     <widget name="entry1"/>
    ///     <widget name="entry2"/>
    ///   </focus-chain>
    /// </object>
    /// ```
    ///
    /// This is an Abstract Base Class, you cannot instantiate it.
    ///
    /// ## Properties
    ///
    ///
    /// #### `border-width`
    ///  Readable | Writable
    ///
    ///
    /// #### `child`
    ///  Writable
    ///
    ///
    /// #### `resize-mode`
    ///  Readable | Writable
    /// <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
    ///
    ///
    /// #### `add`
    ///
    ///
    ///
    /// #### `check-resize`
    ///
    ///
    ///
    /// #### `remove`
    ///
    ///
    ///
    /// #### `set-focus-child`
    ///
    /// <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
    ///
    /// [`ContainerExt`][trait@crate::prelude::ContainerExt], [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`ContainerExtManual`][trait@crate::prelude::ContainerExtManual], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`BuildableExtManual`][trait@crate::prelude::BuildableExtManual]
    #[doc(alias = "GtkContainer")]
    pub struct Container(Object<ffi::GtkContainer, ffi::GtkContainerClass>) @extends Widget, @implements Buildable;

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

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

/// Trait containing all [`struct@Container`] methods.
///
/// # Implementors
///
/// [`Bin`][struct@crate::Bin], [`Box`][struct@crate::Box], [`Container`][struct@crate::Container], [`Fixed`][struct@crate::Fixed], [`FlowBox`][struct@crate::FlowBox], [`Grid`][struct@crate::Grid], [`HeaderBar`][struct@crate::HeaderBar], [`IconView`][struct@crate::IconView], [`Layout`][struct@crate::Layout], [`ListBox`][struct@crate::ListBox], [`MenuShell`][struct@crate::MenuShell], [`Notebook`][struct@crate::Notebook], [`Paned`][struct@crate::Paned], [`Socket`][struct@crate::Socket], [`Stack`][struct@crate::Stack], [`TextView`][struct@crate::TextView], [`ToolItemGroup`][struct@crate::ToolItemGroup], [`ToolPalette`][struct@crate::ToolPalette], [`Toolbar`][struct@crate::Toolbar], [`TreeView`][struct@crate::TreeView]
pub trait ContainerExt: IsA<Container> + 'static {
    /// Adds `widget` to `self`. Typically used for simple containers
    /// such as [`Window`][crate::Window], [`Frame`][crate::Frame], or [`Button`][crate::Button]; for more complicated
    /// layout containers such as [`Box`][crate::Box] or [`Grid`][crate::Grid], this function will
    /// pick default packing parameters that may not be correct. So
    /// consider functions such as [`BoxExt::pack_start()`][crate::prelude::BoxExt::pack_start()] and
    /// [`GridExt::attach()`][crate::prelude::GridExt::attach()] as an alternative to [`add()`][Self::add()] in
    /// those cases. A widget may be added to only one container at a time;
    /// you can’t place the same widget inside two different containers.
    ///
    /// Note that some containers, such as [`ScrolledWindow`][crate::ScrolledWindow] or [`ListBox`][crate::ListBox],
    /// may add intermediate children between the added widget and the
    /// container.
    /// ## `widget`
    /// a widget to be placed inside `self`
    #[doc(alias = "gtk_container_add")]
    fn add(&self, widget: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_container_add(
                self.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
            );
        }
    }

    //#[doc(alias = "gtk_container_add_with_properties")]
    //fn add_with_properties(&self, widget: &impl IsA<Widget>, first_prop_name: &str, : /*Unknown conversion*//*Unimplemented*/Basic: VarArgs) {
    //    unsafe { TODO: call ffi:gtk_container_add_with_properties() }
    //}

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

    //#[doc(alias = "gtk_container_child_get")]
    //fn child_get(&self, child: &impl IsA<Widget>, first_prop_name: &str, : /*Unknown conversion*//*Unimplemented*/Basic: VarArgs) {
    //    unsafe { TODO: call ffi:gtk_container_child_get() }
    //}

    //#[doc(alias = "gtk_container_child_get_valist")]
    //fn child_get_valist(&self, child: &impl IsA<Widget>, first_property_name: &str, var_args: /*Unknown conversion*//*Unimplemented*/Unsupported) {
    //    unsafe { TODO: call ffi:gtk_container_child_get_valist() }
    //}

    /// Emits a [`child-notify`][struct@crate::Widget#child-notify] signal for the
    /// [child property][child-properties]
    /// `child_property` on the child.
    ///
    /// This is an analogue of [`ObjectExt::notify()`][crate::glib::prelude::ObjectExt::notify()] for child properties.
    ///
    /// Also see [`WidgetExt::child_notify()`][crate::prelude::WidgetExt::child_notify()].
    /// ## `child`
    /// the child widget
    /// ## `child_property`
    /// the name of a child property installed on
    ///  the class of `self`
    #[doc(alias = "gtk_container_child_notify")]
    fn child_notify(&self, child: &impl IsA<Widget>, child_property: &str) {
        unsafe {
            ffi::gtk_container_child_notify(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
                child_property.to_glib_none().0,
            );
        }
    }

    /// Emits a [`child-notify`][struct@crate::Widget#child-notify] signal for the
    /// [child property][child-properties] specified by
    /// `pspec` on the child.
    ///
    /// This is an analogue of [`ObjectExt::notify_by_pspec()`][crate::glib::prelude::ObjectExt::notify_by_pspec()] for child properties.
    /// ## `child`
    /// the child widget
    /// ## `pspec`
    /// the [`glib::ParamSpec`][crate::glib::ParamSpec] of a child property instealled on
    ///  the class of `self`
    #[doc(alias = "gtk_container_child_notify_by_pspec")]
    fn child_notify_by_pspec(&self, child: &impl IsA<Widget>, pspec: impl AsRef<glib::ParamSpec>) {
        unsafe {
            ffi::gtk_container_child_notify_by_pspec(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
                pspec.as_ref().to_glib_none().0,
            );
        }
    }

    //#[doc(alias = "gtk_container_child_set")]
    //fn child_set(&self, child: &impl IsA<Widget>, first_prop_name: &str, : /*Unknown conversion*//*Unimplemented*/Basic: VarArgs) {
    //    unsafe { TODO: call ffi:gtk_container_child_set() }
    //}

    //#[doc(alias = "gtk_container_child_set_valist")]
    //fn child_set_valist(&self, child: &impl IsA<Widget>, first_property_name: &str, var_args: /*Unknown conversion*//*Unimplemented*/Unsupported) {
    //    unsafe { TODO: call ffi:gtk_container_child_set_valist() }
    //}

    /// Returns the type of the children supported by the container.
    ///
    /// Note that this may return `G_TYPE_NONE` to indicate that no more
    /// children can be added, e.g. for a [`Paned`][crate::Paned] which already has two
    /// children.
    ///
    /// # Returns
    ///
    /// a `GType`.
    #[doc(alias = "gtk_container_child_type")]
    fn child_type(&self) -> glib::types::Type {
        unsafe {
            from_glib(ffi::gtk_container_child_type(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Invokes `callback` on each direct child of `self`, including
    /// children that are considered “internal” (implementation details
    /// of the container). “Internal” children generally weren’t added
    /// by the user of the container, but were added by the container
    /// implementation itself.
    ///
    /// Most applications should use [`foreach()`][Self::foreach()], rather
    /// than [`forall()`][Self::forall()].
    /// ## `callback`
    /// a callback
    /// ## `callback_data`
    /// callback user data
    #[doc(alias = "gtk_container_forall")]
    fn forall<P: FnMut(&Widget)>(&self, callback: P) {
        let mut callback_data: P = callback;
        unsafe extern "C" fn callback_func<P: FnMut(&Widget)>(
            widget: *mut ffi::GtkWidget,
            data: glib::ffi::gpointer,
        ) {
            unsafe {
                let widget = from_glib_borrow(widget);
                let callback = data as *mut P;
                (*callback)(&widget)
            }
        }
        let callback = Some(callback_func::<P> as _);
        let super_callback0: &mut P = &mut callback_data;
        unsafe {
            ffi::gtk_container_forall(
                self.as_ref().to_glib_none().0,
                callback,
                super_callback0 as *mut _ as *mut _,
            );
        }
    }

    /// Invokes `callback` on each non-internal child of `self`.
    /// See [`forall()`][Self::forall()] for details on what constitutes
    /// an “internal” child. For all practical purposes, this function
    /// should iterate over precisely those child widgets that were
    /// added to the container by the application with explicit `add()`
    /// calls.
    ///
    /// It is permissible to remove the child from the `callback` handler.
    ///
    /// Most applications should use [`foreach()`][Self::foreach()],
    /// rather than [`forall()`][Self::forall()].
    /// ## `callback`
    /// a callback
    /// ## `callback_data`
    /// callback user data
    #[doc(alias = "gtk_container_foreach")]
    fn foreach<P: FnMut(&Widget)>(&self, callback: P) {
        let mut callback_data: P = callback;
        unsafe extern "C" fn callback_func<P: FnMut(&Widget)>(
            widget: *mut ffi::GtkWidget,
            data: glib::ffi::gpointer,
        ) {
            unsafe {
                let widget = from_glib_borrow(widget);
                let callback = data as *mut P;
                (*callback)(&widget)
            }
        }
        let callback = Some(callback_func::<P> as _);
        let super_callback0: &mut P = &mut callback_data;
        unsafe {
            ffi::gtk_container_foreach(
                self.as_ref().to_glib_none().0,
                callback,
                super_callback0 as *mut _ as *mut _,
            );
        }
    }

    /// Retrieves the border width of the container. See
    /// [`set_border_width()`][Self::set_border_width()].
    ///
    /// # Returns
    ///
    /// the current border width
    #[doc(alias = "gtk_container_get_border_width")]
    #[doc(alias = "get_border_width")]
    #[doc(alias = "border-width")]
    fn border_width(&self) -> u32 {
        unsafe { ffi::gtk_container_get_border_width(self.as_ref().to_glib_none().0) }
    }

    /// Returns the container’s non-internal children. See
    /// [`forall()`][Self::forall()] for details on what constitutes an "internal" child.
    ///
    /// # Returns
    ///
    /// a newly-allocated list of the container’s non-internal children.
    #[doc(alias = "gtk_container_get_children")]
    #[doc(alias = "get_children")]
    fn children(&self) -> Vec<Widget> {
        unsafe {
            FromGlibPtrContainer::from_glib_container(ffi::gtk_container_get_children(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    //#[cfg_attr(feature = "v3_24", deprecated = "Since 3.24")]
    //#[allow(deprecated)]
    //#[doc(alias = "gtk_container_get_focus_chain")]
    //#[doc(alias = "get_focus_chain")]
    //fn focus_chain(&self, focusable_widgets: /*Unimplemented*/Vec<Widget>) -> bool {
    //    unsafe { TODO: call ffi:gtk_container_get_focus_chain() }
    //}

    /// Returns the current focus child widget inside `self`. This is not the
    /// currently focused widget. That can be obtained by calling
    /// [`GtkWindowExt::focused_widget()`][crate::prelude::GtkWindowExt::focused_widget()].
    ///
    /// # Returns
    ///
    /// The child widget which will receive the
    ///  focus inside `self` when the `self` is focused,
    ///  or [`None`] if none is set.
    #[doc(alias = "gtk_container_get_focus_child")]
    #[doc(alias = "get_focus_child")]
    fn focus_child(&self) -> Option<Widget> {
        unsafe {
            from_glib_none(ffi::gtk_container_get_focus_child(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Retrieves the horizontal focus adjustment for the container. See
    /// gtk_container_set_focus_hadjustment ().
    ///
    /// # Returns
    ///
    /// the horizontal focus adjustment, or [`None`] if
    ///  none has been set.
    #[doc(alias = "gtk_container_get_focus_hadjustment")]
    #[doc(alias = "get_focus_hadjustment")]
    fn focus_hadjustment(&self) -> Option<Adjustment> {
        unsafe {
            from_glib_none(ffi::gtk_container_get_focus_hadjustment(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Retrieves the vertical focus adjustment for the container. See
    /// [`set_focus_vadjustment()`][Self::set_focus_vadjustment()].
    ///
    /// # Returns
    ///
    /// the vertical focus adjustment, or
    ///  [`None`] if none has been set.
    #[doc(alias = "gtk_container_get_focus_vadjustment")]
    #[doc(alias = "get_focus_vadjustment")]
    fn focus_vadjustment(&self) -> Option<Adjustment> {
        unsafe {
            from_glib_none(ffi::gtk_container_get_focus_vadjustment(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Returns a newly created widget path representing all the widget hierarchy
    /// from the toplevel down to and including `child`.
    /// ## `child`
    /// a child of `self`
    ///
    /// # Returns
    ///
    /// A newly created [`WidgetPath`][crate::WidgetPath]
    #[doc(alias = "gtk_container_get_path_for_child")]
    #[doc(alias = "get_path_for_child")]
    fn path_for_child(&self, child: &impl IsA<Widget>) -> Option<WidgetPath> {
        unsafe {
            from_glib_full(ffi::gtk_container_get_path_for_child(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
            ))
        }
    }

    /// When a container receives a call to the draw function, it must send
    /// synthetic [`draw`][struct@crate::Widget#draw] calls to all children that don’t have their
    /// own `GdkWindows`. This function provides a convenient way of doing this.
    /// A container, when it receives a call to its [`draw`][struct@crate::Widget#draw] function,
    /// calls [`propagate_draw()`][Self::propagate_draw()] once for each child, passing in
    /// the `cr` the container received.
    ///
    /// [`propagate_draw()`][Self::propagate_draw()] takes care of translating the origin of `cr`,
    /// and deciding whether the draw needs to be sent to the child. It is a
    /// convenient and optimized way of getting the same effect as calling
    /// [`WidgetExt::draw()`][crate::prelude::WidgetExt::draw()] on the child directly.
    ///
    /// In most cases, a container can simply either inherit the
    /// [`draw`][struct@crate::Widget#draw] implementation from [`Container`][crate::Container], or do some drawing
    /// and then chain to the ::draw implementation from [`Container`][crate::Container].
    /// ## `child`
    /// a child of `self`
    /// ## `cr`
    /// Cairo context as passed to the container. If you want to use `cr`
    ///  in container’s draw function, consider using `cairo_save()` and
    ///  `cairo_restore()` before calling this function.
    #[doc(alias = "gtk_container_propagate_draw")]
    fn propagate_draw(&self, child: &impl IsA<Widget>, cr: &cairo::Context) {
        unsafe {
            ffi::gtk_container_propagate_draw(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
                mut_override(cr.to_glib_none().0),
            );
        }
    }

    /// Removes `widget` from `self`. `widget` must be inside `self`.
    /// Note that `self` will own a reference to `widget`, and that this
    /// may be the last reference held; so removing a widget from its
    /// container can destroy that widget. If you want to use `widget`
    /// again, you need to add a reference to it before removing it from
    /// a container, using `g_object_ref()`. If you don’t want to use `widget`
    /// again it’s usually more efficient to simply destroy it directly
    /// using `gtk_widget_destroy()` since this will remove it from the
    /// container and help break any circular reference count cycles.
    /// ## `widget`
    /// a current child of `self`
    #[doc(alias = "gtk_container_remove")]
    fn remove(&self, widget: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_container_remove(
                self.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
            );
        }
    }

    /// Sets the border width of the container.
    ///
    /// The border width of a container is the amount of space to leave
    /// around the outside of the container. The only exception to this is
    /// [`Window`][crate::Window]; because toplevel windows can’t leave space outside,
    /// they leave the space inside. The border is added on all sides of
    /// the container. To add space to only one side, use a specific
    /// [`margin`][struct@crate::Widget#margin] property on the child widget, for example
    /// [`margin-top`][struct@crate::Widget#margin-top].
    /// ## `border_width`
    /// amount of blank space to leave outside
    ///  the container. Valid values are in the range 0-65535 pixels.
    #[doc(alias = "gtk_container_set_border_width")]
    #[doc(alias = "border-width")]
    fn set_border_width(&self, border_width: u32) {
        unsafe {
            ffi::gtk_container_set_border_width(self.as_ref().to_glib_none().0, border_width);
        }
    }

    /// Sets a focus chain, overriding the one computed automatically by GTK+.
    ///
    /// In principle each widget in the chain should be a descendant of the
    /// container, but this is not enforced by this method, since it’s allowed
    /// to set the focus chain before you pack the widgets, or have a widget
    /// in the chain that isn’t always packed. The necessary checks are done
    /// when the focus chain is actually traversed.
    ///
    /// # Deprecated since 3.24
    ///
    /// For overriding focus behavior, use the
    ///  GtkWidgetClass::focus signal.
    /// ## `focusable_widgets`
    ///
    ///  the new focus chain
    #[cfg_attr(feature = "v3_24", deprecated = "Since 3.24")]
    #[allow(deprecated)]
    #[doc(alias = "gtk_container_set_focus_chain")]
    fn set_focus_chain(&self, focusable_widgets: &[Widget]) {
        unsafe {
            ffi::gtk_container_set_focus_chain(
                self.as_ref().to_glib_none().0,
                focusable_widgets.to_glib_none().0,
            );
        }
    }

    /// Sets, or unsets if `child` is [`None`], the focused child of `self`.
    ///
    /// This function emits the GtkContainer::set_focus_child signal of
    /// `self`. Implementations of [`Container`][crate::Container] can override the
    /// default behaviour by overriding the class closure of this signal.
    ///
    /// This is function is mostly meant to be used by widgets. Applications can use
    /// [`WidgetExt::grab_focus()`][crate::prelude::WidgetExt::grab_focus()] to manually set the focus to a specific widget.
    /// ## `child`
    /// a [`Widget`][crate::Widget], or [`None`]
    #[doc(alias = "gtk_container_set_focus_child")]
    fn set_focus_child(&self, child: Option<&impl IsA<Widget>>) {
        unsafe {
            ffi::gtk_container_set_focus_child(
                self.as_ref().to_glib_none().0,
                child.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    /// Hooks up an adjustment to focus handling in a container, so when a child
    /// of the container is focused, the adjustment is scrolled to show that
    /// widget. This function sets the horizontal alignment.
    /// See [`ScrolledWindowExt::hadjustment()`][crate::prelude::ScrolledWindowExt::hadjustment()] for a typical way of obtaining
    /// the adjustment and [`set_focus_vadjustment()`][Self::set_focus_vadjustment()] for setting
    /// the vertical adjustment.
    ///
    /// The adjustments have to be in pixel units and in the same coordinate
    /// system as the allocation for immediate children of the container.
    /// ## `adjustment`
    /// an adjustment which should be adjusted when the focus is
    ///  moved among the descendents of `self`
    #[doc(alias = "gtk_container_set_focus_hadjustment")]
    fn set_focus_hadjustment(&self, adjustment: &impl IsA<Adjustment>) {
        unsafe {
            ffi::gtk_container_set_focus_hadjustment(
                self.as_ref().to_glib_none().0,
                adjustment.as_ref().to_glib_none().0,
            );
        }
    }

    /// Hooks up an adjustment to focus handling in a container, so when a
    /// child of the container is focused, the adjustment is scrolled to
    /// show that widget. This function sets the vertical alignment. See
    /// [`ScrolledWindowExt::vadjustment()`][crate::prelude::ScrolledWindowExt::vadjustment()] for a typical way of obtaining
    /// the adjustment and [`set_focus_hadjustment()`][Self::set_focus_hadjustment()] for setting
    /// the horizontal adjustment.
    ///
    /// The adjustments have to be in pixel units and in the same coordinate
    /// system as the allocation for immediate children of the container.
    /// ## `adjustment`
    /// an adjustment which should be adjusted when the focus
    ///  is moved among the descendents of `self`
    #[doc(alias = "gtk_container_set_focus_vadjustment")]
    fn set_focus_vadjustment(&self, adjustment: &impl IsA<Adjustment>) {
        unsafe {
            ffi::gtk_container_set_focus_vadjustment(
                self.as_ref().to_glib_none().0,
                adjustment.as_ref().to_glib_none().0,
            );
        }
    }

    /// Removes a focus chain explicitly set with [`set_focus_chain()`][Self::set_focus_chain()].
    ///
    /// # Deprecated since 3.24
    ///
    /// For overriding focus behavior, use the
    ///  GtkWidgetClass::focus signal.
    #[cfg_attr(feature = "v3_24", deprecated = "Since 3.24")]
    #[allow(deprecated)]
    #[doc(alias = "gtk_container_unset_focus_chain")]
    fn unset_focus_chain(&self) {
        unsafe {
            ffi::gtk_container_unset_focus_chain(self.as_ref().to_glib_none().0);
        }
    }

    fn set_child<P: IsA<Widget>>(&self, child: Option<&P>) {
        ObjectExt::set_property(self.as_ref(), "child", child)
    }

    #[doc(alias = "resize-mode")]
    fn resize_mode(&self) -> ResizeMode {
        ObjectExt::property(self.as_ref(), "resize-mode")
    }

    #[doc(alias = "resize-mode")]
    fn set_resize_mode(&self, resize_mode: ResizeMode) {
        ObjectExt::set_property(self.as_ref(), "resize-mode", resize_mode)
    }

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

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

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

    #[doc(alias = "set-focus-child")]
    fn connect_set_focus_child<F: Fn(&Self, &Widget) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn set_focus_child_trampoline<
            P: IsA<Container>,
            F: Fn(&P, &Widget) + 'static,
        >(
            this: *mut ffi::GtkContainer,
            object: *mut ffi::GtkWidget,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(
                    Container::from_glib_borrow(this).unsafe_cast_ref(),
                    &from_glib_borrow(object),
                )
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                c"set-focus-child".as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    set_focus_child_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

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

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

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

impl<O: IsA<Container>> ContainerExt for O {}