gtk/auto/

flow_box.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::{
    Adjustment, Align, Buildable, Container, FlowBoxChild, MovementStep, Orientable, Orientation,
    ResizeMode, SelectionMode, Widget,
};
use glib::{
    prelude::*,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};
use std::{boxed::Box as Box_, fmt, mem::transmute};

glib::wrapper! {
    /// A GtkFlowBox positions child widgets in sequence according to its
    /// orientation.
    ///
    /// For instance, with the horizontal orientation, the widgets will be
    /// arranged from left to right, starting a new row under the previous
    /// row when necessary. Reducing the width in this case will require more
    /// rows, so a larger height will be requested.
    ///
    /// Likewise, with the vertical orientation, the widgets will be arranged
    /// from top to bottom, starting a new column to the right when necessary.
    /// Reducing the height will require more columns, so a larger width will
    /// be requested.
    ///
    /// The size request of a GtkFlowBox alone may not be what you expect; if you
    /// need to be able to shrink it along both axes and dynamically reflow its
    /// children, you may have to wrap it in a [`ScrolledWindow`][crate::ScrolledWindow] to enable that.
    ///
    /// The children of a GtkFlowBox can be dynamically sorted and filtered.
    ///
    /// Although a GtkFlowBox must have only [`FlowBoxChild`][crate::FlowBoxChild] children,
    /// you can add any kind of widget to it via [`ContainerExt::add()`][crate::prelude::ContainerExt::add()], and
    /// a GtkFlowBoxChild widget will automatically be inserted between
    /// the box and the widget.
    ///
    /// Also see [`ListBox`][crate::ListBox].
    ///
    /// GtkFlowBox was added in GTK+ 3.12.
    ///
    /// # CSS nodes
    ///
    ///
    ///
    /// **⚠️ The following code is in plain ⚠️**
    ///
    /// ```plain
    /// flowbox
    /// ├── flowboxchild
    /// │   ╰── <child>
    /// ├── flowboxchild
    /// │   ╰── <child>
    /// ┊
    /// ╰── [rubberband]
    /// ```
    ///
    /// GtkFlowBox uses a single CSS node with name flowbox. GtkFlowBoxChild
    /// uses a single CSS node with name flowboxchild.
    /// For rubberband selection, a subnode with name rubberband is used.
    ///
    /// ## Properties
    ///
    ///
    /// #### `activate-on-single-click`
    ///  Determines whether children can be activated with a single
    /// click, or require a double-click.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `column-spacing`
    ///  The amount of horizontal space between two children.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `homogeneous`
    ///  Determines whether all children should be allocated the
    /// same size.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `max-children-per-line`
    ///  The maximum amount of children to request space for consecutively
    /// in the given orientation.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `min-children-per-line`
    ///  The minimum number of children to allocate consecutively
    /// in the given orientation.
    ///
    /// Setting the minimum children per line ensures
    /// that a reasonably small height will be requested
    /// for the overall minimum width of the box.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `row-spacing`
    ///  The amount of vertical space between two children.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `selection-mode`
    ///  The selection mode used by the flow box.
    ///
    /// Readable | Writeable
    /// <details><summary><h4>Container</h4></summary>
    ///
    ///
    /// #### `border-width`
    ///  Readable | Writeable
    ///
    ///
    /// #### `child`
    ///  Writeable
    ///
    ///
    /// #### `resize-mode`
    ///  Readable | Writeable
    /// </details>
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `app-paintable`
    ///  Readable | Writeable
    ///
    ///
    /// #### `can-default`
    ///  Readable | Writeable
    ///
    ///
    /// #### `can-focus`
    ///  Readable | Writeable
    ///
    ///
    /// #### `composite-child`
    ///  Readable
    ///
    ///
    /// #### `double-buffered`
    ///  Whether the widget is double buffered.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `events`
    ///  Readable | Writeable
    ///
    ///
    /// #### `expand`
    ///  Whether to expand in both directions. Setting this sets both [`hexpand`][struct@crate::Widget#hexpand] and [`vexpand`][struct@crate::Widget#vexpand]
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `halign`
    ///  How to distribute horizontal space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `has-default`
    ///  Readable | Writeable
    ///
    ///
    /// #### `has-focus`
    ///  Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `height-request`
    ///  Readable | Writeable
    ///
    ///
    /// #### `hexpand`
    ///  Whether to expand horizontally. See [`WidgetExt::set_hexpand()`][crate::prelude::WidgetExt::set_hexpand()].
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `hexpand-set`
    ///  Whether to use the [`hexpand`][struct@crate::Widget#hexpand] property. See [`WidgetExt::is_hexpand_set()`][crate::prelude::WidgetExt::is_hexpand_set()].
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `is-focus`
    ///  Readable | Writeable
    ///
    ///
    /// #### `margin`
    ///  Sets all four sides' margin at once. If read, returns max
    /// margin on any side.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `name`
    ///  Readable | Writeable
    ///
    ///
    /// #### `no-show-all`
    ///  Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `parent`
    ///  Readable | Writeable
    ///
    ///
    /// #### `receives-default`
    ///  Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `style`
    ///  The style of the widget, which contains information about how it will look (colors, etc).
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `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 | Writeable
    ///
    ///
    /// #### `valign`
    ///  How to distribute vertical space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `vexpand`
    ///  Whether to expand vertically. See [`WidgetExt::set_vexpand()`][crate::prelude::WidgetExt::set_vexpand()].
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `vexpand-set`
    ///  Whether to use the [`vexpand`][struct@crate::Widget#vexpand] property. See [`WidgetExt::is_vexpand_set()`][crate::prelude::WidgetExt::is_vexpand_set()].
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `visible`
    ///  Readable | Writeable
    ///
    ///
    /// #### `width-request`
    ///  Readable | Writeable
    ///
    ///
    /// #### `window`
    ///  The widget's window if it is realized, [`None`] otherwise.
    ///
    /// Readable
    /// </details>
    /// <details><summary><h4>Orientable</h4></summary>
    ///
    ///
    /// #### `orientation`
    ///  The orientation of the orientable.
    ///
    /// Readable | Writeable
    /// </details>
    ///
    /// ## Signals
    ///
    ///
    /// #### `activate-cursor-child`
    ///  The ::activate-cursor-child signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user activates the `box_`.
    ///
    /// Action
    ///
    ///
    /// #### `child-activated`
    ///  The ::child-activated signal is emitted when a child has been
    /// activated by the user.
    ///
    ///
    ///
    ///
    /// #### `move-cursor`
    ///  The ::move-cursor signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user initiates a cursor movement.
    ///
    /// Applications should not connect to it, but may emit it with
    /// `g_signal_emit_by_name()` if they need to control the cursor
    /// programmatically.
    ///
    /// The default bindings for this signal come in two variants,
    /// the variant with the Shift modifier extends the selection,
    /// the variant without the Shift modifer does not.
    /// There are too many key combinations to list them all here.
    /// - Arrow keys move by individual children
    /// - Home/End keys move to the ends of the box
    /// - PageUp/PageDown keys move vertically by pages
    ///
    /// Action
    ///
    ///
    /// #### `select-all`
    ///  The ::select-all signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to select all children of the box, if
    /// the selection mode permits it.
    ///
    /// The default bindings for this signal is Ctrl-a.
    ///
    /// Action
    ///
    ///
    /// #### `selected-children-changed`
    ///  The ::selected-children-changed signal is emitted when the
    /// set of selected children changes.
    ///
    /// Use [`FlowBoxExt::selected_foreach()`][crate::prelude::FlowBoxExt::selected_foreach()] or
    /// [`FlowBoxExt::selected_children()`][crate::prelude::FlowBoxExt::selected_children()] to obtain the
    /// selected children.
    ///
    ///
    ///
    ///
    /// #### `toggle-cursor-child`
    ///  The ::toggle-cursor-child signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which toggles the selection of the child that has the focus.
    ///
    /// The default binding for this signal is Ctrl-Space.
    ///
    /// Action
    ///
    ///
    /// #### `unselect-all`
    ///  The ::unselect-all signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to unselect all children of the box, if
    /// the selection mode permits it.
    ///
    /// The default bindings for this signal is Ctrl-Shift-a.
    ///
    /// Action
    /// <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
    ///
    /// [`FlowBoxExt`][trait@crate::prelude::FlowBoxExt], [`ContainerExt`][trait@crate::prelude::ContainerExt], [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`OrientableExt`][trait@crate::prelude::OrientableExt], [`FlowBoxExtManual`][trait@crate::prelude::FlowBoxExtManual], [`ContainerExtManual`][trait@crate::prelude::ContainerExtManual], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`BuildableExtManual`][trait@crate::prelude::BuildableExtManual]
    #[doc(alias = "GtkFlowBox")]
    pub struct FlowBox(Object<ffi::GtkFlowBox, ffi::GtkFlowBoxClass>) @extends Container, Widget, @implements Buildable, Orientable;

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

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

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

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

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

// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`FlowBox`] 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 FlowBoxBuilder {
    builder: glib::object::ObjectBuilder<'static, FlowBox>,
}

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

    /// Determines whether children can be activated with a single
    /// click, or require a double-click.
    pub fn activate_on_single_click(self, activate_on_single_click: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("activate-on-single-click", activate_on_single_click),
        }
    }

    /// The amount of horizontal space between two children.
    pub fn column_spacing(self, column_spacing: u32) -> Self {
        Self {
            builder: self.builder.property("column-spacing", column_spacing),
        }
    }

    /// Determines whether all children should be allocated the
    /// same size.
    pub fn homogeneous(self, homogeneous: bool) -> Self {
        Self {
            builder: self.builder.property("homogeneous", homogeneous),
        }
    }

    /// The maximum amount of children to request space for consecutively
    /// in the given orientation.
    pub fn max_children_per_line(self, max_children_per_line: u32) -> Self {
        Self {
            builder: self
                .builder
                .property("max-children-per-line", max_children_per_line),
        }
    }

    /// The minimum number of children to allocate consecutively
    /// in the given orientation.
    ///
    /// Setting the minimum children per line ensures
    /// that a reasonably small height will be requested
    /// for the overall minimum width of the box.
    pub fn min_children_per_line(self, min_children_per_line: u32) -> Self {
        Self {
            builder: self
                .builder
                .property("min-children-per-line", min_children_per_line),
        }
    }

    /// The amount of vertical space between two children.
    pub fn row_spacing(self, row_spacing: u32) -> Self {
        Self {
            builder: self.builder.property("row-spacing", row_spacing),
        }
    }

    /// The selection mode used by the flow box.
    pub fn selection_mode(self, selection_mode: SelectionMode) -> Self {
        Self {
            builder: self.builder.property("selection-mode", selection_mode),
        }
    }

    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),
        }
    }

    /// The orientation of the orientable.
    pub fn orientation(self, orientation: Orientation) -> Self {
        Self {
            builder: self.builder.property("orientation", orientation),
        }
    }

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

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::FlowBox>> Sealed for T {}
}

/// Trait containing all [`struct@FlowBox`] methods.
///
/// # Implementors
///
/// [`FlowBox`][struct@crate::FlowBox]
pub trait FlowBoxExt: IsA<FlowBox> + sealed::Sealed + 'static {
    /// Binds `model` to `self`.
    ///
    /// If `self` was already bound to a model, that previous binding is
    /// destroyed.
    ///
    /// The contents of `self` are cleared and then filled with widgets that
    /// represent items from `model`. `self` is updated whenever `model` changes.
    /// If `model` is [`None`], `self` is left empty.
    ///
    /// It is undefined to add or remove widgets directly (for example, with
    /// [`insert()`][Self::insert()] or [`ContainerExt::add()`][crate::prelude::ContainerExt::add()]) while `self` is bound to a
    /// model.
    ///
    /// Note that using a model is incompatible with the filtering and sorting
    /// functionality in GtkFlowBox. When using a model, filtering and sorting
    /// should be implemented by the model.
    /// ## `model`
    /// the [`gio::ListModel`][crate::gio::ListModel] to be bound to `self`
    /// ## `create_widget_func`
    /// a function that creates widgets for items
    #[doc(alias = "gtk_flow_box_bind_model")]
    fn bind_model<P: Fn(&glib::Object) -> Widget + 'static>(
        &self,
        model: Option<&impl IsA<gio::ListModel>>,
        create_widget_func: P,
    ) {
        let create_widget_func_data: Box_<P> = Box_::new(create_widget_func);
        unsafe extern "C" fn create_widget_func_func<P: Fn(&glib::Object) -> Widget + 'static>(
            item: *mut glib::gobject_ffi::GObject,
            user_data: glib::ffi::gpointer,
        ) -> *mut ffi::GtkWidget {
            let item = from_glib_borrow(item);
            let callback: &P = &*(user_data as *mut _);
            (*callback)(&item).to_glib_full()
        }
        let create_widget_func = Some(create_widget_func_func::<P> as _);
        unsafe extern "C" fn user_data_free_func_func<P: Fn(&glib::Object) -> Widget + 'static>(
            data: glib::ffi::gpointer,
        ) {
            let _callback: Box_<P> = Box_::from_raw(data as *mut _);
        }
        let destroy_call4 = Some(user_data_free_func_func::<P> as _);
        let super_callback0: Box_<P> = create_widget_func_data;
        unsafe {
            ffi::gtk_flow_box_bind_model(
                self.as_ref().to_glib_none().0,
                model.map(|p| p.as_ref()).to_glib_none().0,
                create_widget_func,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call4,
            );
        }
    }

    /// Returns whether children activate on single clicks.
    ///
    /// # Returns
    ///
    /// [`true`] if children are activated on single click,
    ///  [`false`] otherwise
    #[doc(alias = "gtk_flow_box_get_activate_on_single_click")]
    #[doc(alias = "get_activate_on_single_click")]
    fn activates_on_single_click(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_flow_box_get_activate_on_single_click(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets the nth child in the `self`.
    /// ## `idx`
    /// the position of the child
    ///
    /// # Returns
    ///
    /// the child widget, which will
    ///  always be a [`FlowBoxChild`][crate::FlowBoxChild] or [`None`] in case no child widget
    ///  with the given index exists.
    #[doc(alias = "gtk_flow_box_get_child_at_index")]
    #[doc(alias = "get_child_at_index")]
    fn child_at_index(&self, idx: i32) -> Option<FlowBoxChild> {
        unsafe {
            from_glib_none(ffi::gtk_flow_box_get_child_at_index(
                self.as_ref().to_glib_none().0,
                idx,
            ))
        }
    }

    /// Gets the child in the (`x`, `y`) position.
    /// ## `x`
    /// the x coordinate of the child
    /// ## `y`
    /// the y coordinate of the child
    ///
    /// # Returns
    ///
    /// the child widget, which will
    ///  always be a [`FlowBoxChild`][crate::FlowBoxChild] or [`None`] in case no child widget
    ///  exists for the given x and y coordinates.
    #[doc(alias = "gtk_flow_box_get_child_at_pos")]
    #[doc(alias = "get_child_at_pos")]
    fn child_at_pos(&self, x: i32, y: i32) -> Option<FlowBoxChild> {
        unsafe {
            from_glib_none(ffi::gtk_flow_box_get_child_at_pos(
                self.as_ref().to_glib_none().0,
                x,
                y,
            ))
        }
    }

    /// Gets the horizontal spacing.
    ///
    /// # Returns
    ///
    /// the horizontal spacing
    #[doc(alias = "gtk_flow_box_get_column_spacing")]
    #[doc(alias = "get_column_spacing")]
    fn column_spacing(&self) -> u32 {
        unsafe { ffi::gtk_flow_box_get_column_spacing(self.as_ref().to_glib_none().0) }
    }

    /// Returns whether the box is homogeneous (all children are the
    /// same size). See [`BoxExt::set_homogeneous()`][crate::prelude::BoxExt::set_homogeneous()].
    ///
    /// # Returns
    ///
    /// [`true`] if the box is homogeneous.
    #[doc(alias = "gtk_flow_box_get_homogeneous")]
    #[doc(alias = "get_homogeneous")]
    fn is_homogeneous(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_flow_box_get_homogeneous(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets the maximum number of children per line.
    ///
    /// # Returns
    ///
    /// the maximum number of children per line
    #[doc(alias = "gtk_flow_box_get_max_children_per_line")]
    #[doc(alias = "get_max_children_per_line")]
    fn max_children_per_line(&self) -> u32 {
        unsafe { ffi::gtk_flow_box_get_max_children_per_line(self.as_ref().to_glib_none().0) }
    }

    /// Gets the minimum number of children per line.
    ///
    /// # Returns
    ///
    /// the minimum number of children per line
    #[doc(alias = "gtk_flow_box_get_min_children_per_line")]
    #[doc(alias = "get_min_children_per_line")]
    fn min_children_per_line(&self) -> u32 {
        unsafe { ffi::gtk_flow_box_get_min_children_per_line(self.as_ref().to_glib_none().0) }
    }

    /// Gets the vertical spacing.
    ///
    /// # Returns
    ///
    /// the vertical spacing
    #[doc(alias = "gtk_flow_box_get_row_spacing")]
    #[doc(alias = "get_row_spacing")]
    fn row_spacing(&self) -> u32 {
        unsafe { ffi::gtk_flow_box_get_row_spacing(self.as_ref().to_glib_none().0) }
    }

    /// Creates a list of all selected children.
    ///
    /// # Returns
    ///
    ///
    ///  A `GList` containing the [`Widget`][crate::Widget] for each selected child.
    ///  Free with `g_list_free()` when done.
    #[doc(alias = "gtk_flow_box_get_selected_children")]
    #[doc(alias = "get_selected_children")]
    fn selected_children(&self) -> Vec<FlowBoxChild> {
        unsafe {
            FromGlibPtrContainer::from_glib_container(ffi::gtk_flow_box_get_selected_children(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Gets the selection mode of `self`.
    ///
    /// # Returns
    ///
    /// the [`SelectionMode`][crate::SelectionMode]
    #[doc(alias = "gtk_flow_box_get_selection_mode")]
    #[doc(alias = "get_selection_mode")]
    fn selection_mode(&self) -> SelectionMode {
        unsafe {
            from_glib(ffi::gtk_flow_box_get_selection_mode(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Inserts the `widget` into `self` at `position`.
    ///
    /// If a sort function is set, the widget will actually be inserted
    /// at the calculated position and this function has the same effect
    /// as [`ContainerExt::add()`][crate::prelude::ContainerExt::add()].
    ///
    /// If `position` is -1, or larger than the total number of children
    /// in the `self`, then the `widget` will be appended to the end.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] to add
    /// ## `position`
    /// the position to insert `child` in
    #[doc(alias = "gtk_flow_box_insert")]
    fn insert(&self, widget: &impl IsA<Widget>, position: i32) {
        unsafe {
            ffi::gtk_flow_box_insert(
                self.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                position,
            );
        }
    }

    /// Updates the filtering for all children.
    ///
    /// Call this function when the result of the filter
    /// function on the `self` is changed due ot an external
    /// factor. For instance, this would be used if the
    /// filter function just looked for a specific search
    /// term, and the entry with the string has changed.
    #[doc(alias = "gtk_flow_box_invalidate_filter")]
    fn invalidate_filter(&self) {
        unsafe {
            ffi::gtk_flow_box_invalidate_filter(self.as_ref().to_glib_none().0);
        }
    }

    /// Updates the sorting for all children.
    ///
    /// Call this when the result of the sort function on
    /// `self` is changed due to an external factor.
    #[doc(alias = "gtk_flow_box_invalidate_sort")]
    fn invalidate_sort(&self) {
        unsafe {
            ffi::gtk_flow_box_invalidate_sort(self.as_ref().to_glib_none().0);
        }
    }

    /// Select all children of `self`, if the selection
    /// mode allows it.
    #[doc(alias = "gtk_flow_box_select_all")]
    fn select_all(&self) {
        unsafe {
            ffi::gtk_flow_box_select_all(self.as_ref().to_glib_none().0);
        }
    }

    /// Selects a single child of `self`, if the selection
    /// mode allows it.
    /// ## `child`
    /// a child of `self`
    #[doc(alias = "gtk_flow_box_select_child")]
    fn select_child(&self, child: &impl IsA<FlowBoxChild>) {
        unsafe {
            ffi::gtk_flow_box_select_child(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
            );
        }
    }

    /// Calls a function for each selected child.
    ///
    /// Note that the selection cannot be modified from within
    /// this function.
    /// ## `func`
    /// the function to call for each selected child
    #[doc(alias = "gtk_flow_box_selected_foreach")]
    fn selected_foreach<P: FnMut(&FlowBox, &FlowBoxChild)>(&self, func: P) {
        let func_data: P = func;
        unsafe extern "C" fn func_func<P: FnMut(&FlowBox, &FlowBoxChild)>(
            box_: *mut ffi::GtkFlowBox,
            child: *mut ffi::GtkFlowBoxChild,
            user_data: glib::ffi::gpointer,
        ) {
            let box_ = from_glib_borrow(box_);
            let child = from_glib_borrow(child);
            let callback: *mut P = user_data as *const _ as usize as *mut P;
            (*callback)(&box_, &child)
        }
        let func = Some(func_func::<P> as _);
        let super_callback0: &P = &func_data;
        unsafe {
            ffi::gtk_flow_box_selected_foreach(
                self.as_ref().to_glib_none().0,
                func,
                super_callback0 as *const _ as usize as *mut _,
            );
        }
    }

    /// If `single` is [`true`], children will be activated when you click
    /// on them, otherwise you need to double-click.
    /// ## `single`
    /// [`true`] to emit child-activated on a single click
    #[doc(alias = "gtk_flow_box_set_activate_on_single_click")]
    fn set_activate_on_single_click(&self, single: bool) {
        unsafe {
            ffi::gtk_flow_box_set_activate_on_single_click(
                self.as_ref().to_glib_none().0,
                single.into_glib(),
            );
        }
    }

    /// Sets the horizontal space to add between children.
    /// See the [`column-spacing`][struct@crate::FlowBox#column-spacing] property.
    /// ## `spacing`
    /// the spacing to use
    #[doc(alias = "gtk_flow_box_set_column_spacing")]
    fn set_column_spacing(&self, spacing: u32) {
        unsafe {
            ffi::gtk_flow_box_set_column_spacing(self.as_ref().to_glib_none().0, spacing);
        }
    }

    /// By setting a filter function on the `self` one can decide dynamically
    /// which of the children to show. For instance, to implement a search
    /// function that only shows the children matching the search terms.
    ///
    /// The `filter_func` will be called for each child after the call, and
    /// it will continue to be called each time a child changes (via
    /// [`FlowBoxChildExt::changed()`][crate::prelude::FlowBoxChildExt::changed()]) or when [`invalidate_filter()`][Self::invalidate_filter()]
    /// is called.
    ///
    /// Note that using a filter function is incompatible with using a model
    /// (see [`bind_model()`][Self::bind_model()]).
    /// ## `filter_func`
    /// callback that
    ///  lets you filter which children to show
    #[doc(alias = "gtk_flow_box_set_filter_func")]
    fn set_filter_func(&self, filter_func: Option<Box_<dyn Fn(&FlowBoxChild) -> bool + 'static>>) {
        let filter_func_data: Box_<Option<Box_<dyn Fn(&FlowBoxChild) -> bool + 'static>>> =
            Box_::new(filter_func);
        unsafe extern "C" fn filter_func_func(
            child: *mut ffi::GtkFlowBoxChild,
            user_data: glib::ffi::gpointer,
        ) -> glib::ffi::gboolean {
            let child = from_glib_borrow(child);
            let callback: &Option<Box_<dyn Fn(&FlowBoxChild) -> bool + 'static>> =
                &*(user_data as *mut _);
            if let Some(ref callback) = *callback {
                callback(&child)
            } else {
                panic!("cannot get closure...")
            }
            .into_glib()
        }
        let filter_func = if filter_func_data.is_some() {
            Some(filter_func_func as _)
        } else {
            None
        };
        unsafe extern "C" fn destroy_func(data: glib::ffi::gpointer) {
            let _callback: Box_<Option<Box_<dyn Fn(&FlowBoxChild) -> bool + 'static>>> =
                Box_::from_raw(data as *mut _);
        }
        let destroy_call3 = Some(destroy_func as _);
        let super_callback0: Box_<Option<Box_<dyn Fn(&FlowBoxChild) -> bool + 'static>>> =
            filter_func_data;
        unsafe {
            ffi::gtk_flow_box_set_filter_func(
                self.as_ref().to_glib_none().0,
                filter_func,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call3,
            );
        }
    }

    /// Hooks up an adjustment to focus handling in `self`.
    /// The adjustment is also used for autoscrolling during
    /// rubberband selection. See [`ScrolledWindowExt::hadjustment()`][crate::prelude::ScrolledWindowExt::hadjustment()]
    /// for a typical way of obtaining the adjustment, and
    /// [`set_vadjustment()`][Self::set_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 box.
    /// ## `adjustment`
    /// an adjustment which should be adjusted
    ///  when the focus is moved among the descendents of `container`
    #[doc(alias = "gtk_flow_box_set_hadjustment")]
    fn set_hadjustment(&self, adjustment: &impl IsA<Adjustment>) {
        unsafe {
            ffi::gtk_flow_box_set_hadjustment(
                self.as_ref().to_glib_none().0,
                adjustment.as_ref().to_glib_none().0,
            );
        }
    }

    /// Sets the [`homogeneous`][struct@crate::FlowBox#homogeneous] property of `self`, controlling
    /// whether or not all children of `self` are given equal space
    /// in the box.
    /// ## `homogeneous`
    /// [`true`] to create equal allotments,
    ///  [`false`] for variable allotments
    #[doc(alias = "gtk_flow_box_set_homogeneous")]
    fn set_homogeneous(&self, homogeneous: bool) {
        unsafe {
            ffi::gtk_flow_box_set_homogeneous(
                self.as_ref().to_glib_none().0,
                homogeneous.into_glib(),
            );
        }
    }

    /// Sets the maximum number of children to request and
    /// allocate space for in `self`’s orientation.
    ///
    /// Setting the maximum number of children per line
    /// limits the overall natural size request to be no more
    /// than `n_children` children long in the given orientation.
    /// ## `n_children`
    /// the maximum number of children per line
    #[doc(alias = "gtk_flow_box_set_max_children_per_line")]
    fn set_max_children_per_line(&self, n_children: u32) {
        unsafe {
            ffi::gtk_flow_box_set_max_children_per_line(self.as_ref().to_glib_none().0, n_children);
        }
    }

    /// Sets the minimum number of children to line up
    /// in `self`’s orientation before flowing.
    /// ## `n_children`
    /// the minimum number of children per line
    #[doc(alias = "gtk_flow_box_set_min_children_per_line")]
    fn set_min_children_per_line(&self, n_children: u32) {
        unsafe {
            ffi::gtk_flow_box_set_min_children_per_line(self.as_ref().to_glib_none().0, n_children);
        }
    }

    /// Sets the vertical space to add between children.
    /// See the [`row-spacing`][struct@crate::FlowBox#row-spacing] property.
    /// ## `spacing`
    /// the spacing to use
    #[doc(alias = "gtk_flow_box_set_row_spacing")]
    fn set_row_spacing(&self, spacing: u32) {
        unsafe {
            ffi::gtk_flow_box_set_row_spacing(self.as_ref().to_glib_none().0, spacing);
        }
    }

    /// Sets how selection works in `self`.
    /// See [`SelectionMode`][crate::SelectionMode] for details.
    /// ## `mode`
    /// the new selection mode
    #[doc(alias = "gtk_flow_box_set_selection_mode")]
    fn set_selection_mode(&self, mode: SelectionMode) {
        unsafe {
            ffi::gtk_flow_box_set_selection_mode(self.as_ref().to_glib_none().0, mode.into_glib());
        }
    }

    /// By setting a sort function on the `self`, one can dynamically
    /// reorder the children of the box, based on the contents of
    /// the children.
    ///
    /// The `sort_func` will be called for each child after the call,
    /// and will continue to be called each time a child changes (via
    /// [`FlowBoxChildExt::changed()`][crate::prelude::FlowBoxChildExt::changed()]) and when [`invalidate_sort()`][Self::invalidate_sort()]
    /// is called.
    ///
    /// Note that using a sort function is incompatible with using a model
    /// (see [`bind_model()`][Self::bind_model()]).
    /// ## `sort_func`
    /// the sort function
    #[doc(alias = "gtk_flow_box_set_sort_func")]
    fn set_sort_func(
        &self,
        sort_func: Option<Box_<dyn Fn(&FlowBoxChild, &FlowBoxChild) -> i32 + 'static>>,
    ) {
        let sort_func_data: Box_<
            Option<Box_<dyn Fn(&FlowBoxChild, &FlowBoxChild) -> i32 + 'static>>,
        > = Box_::new(sort_func);
        unsafe extern "C" fn sort_func_func(
            child1: *mut ffi::GtkFlowBoxChild,
            child2: *mut ffi::GtkFlowBoxChild,
            user_data: glib::ffi::gpointer,
        ) -> libc::c_int {
            let child1 = from_glib_borrow(child1);
            let child2 = from_glib_borrow(child2);
            let callback: &Option<Box_<dyn Fn(&FlowBoxChild, &FlowBoxChild) -> i32 + 'static>> =
                &*(user_data as *mut _);
            if let Some(ref callback) = *callback {
                callback(&child1, &child2)
            } else {
                panic!("cannot get closure...")
            }
        }
        let sort_func = if sort_func_data.is_some() {
            Some(sort_func_func as _)
        } else {
            None
        };
        unsafe extern "C" fn destroy_func(data: glib::ffi::gpointer) {
            let _callback: Box_<
                Option<Box_<dyn Fn(&FlowBoxChild, &FlowBoxChild) -> i32 + 'static>>,
            > = Box_::from_raw(data as *mut _);
        }
        let destroy_call3 = Some(destroy_func as _);
        let super_callback0: Box_<
            Option<Box_<dyn Fn(&FlowBoxChild, &FlowBoxChild) -> i32 + 'static>>,
        > = sort_func_data;
        unsafe {
            ffi::gtk_flow_box_set_sort_func(
                self.as_ref().to_glib_none().0,
                sort_func,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call3,
            );
        }
    }

    /// Hooks up an adjustment to focus handling in `self`.
    /// The adjustment is also used for autoscrolling during
    /// rubberband selection. See [`ScrolledWindowExt::vadjustment()`][crate::prelude::ScrolledWindowExt::vadjustment()]
    /// for a typical way of obtaining the adjustment, and
    /// [`set_hadjustment()`][Self::set_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 box.
    /// ## `adjustment`
    /// an adjustment which should be adjusted
    ///  when the focus is moved among the descendents of `container`
    #[doc(alias = "gtk_flow_box_set_vadjustment")]
    fn set_vadjustment(&self, adjustment: &impl IsA<Adjustment>) {
        unsafe {
            ffi::gtk_flow_box_set_vadjustment(
                self.as_ref().to_glib_none().0,
                adjustment.as_ref().to_glib_none().0,
            );
        }
    }

    /// Unselect all children of `self`, if the selection
    /// mode allows it.
    #[doc(alias = "gtk_flow_box_unselect_all")]
    fn unselect_all(&self) {
        unsafe {
            ffi::gtk_flow_box_unselect_all(self.as_ref().to_glib_none().0);
        }
    }

    /// Unselects a single child of `self`, if the selection
    /// mode allows it.
    /// ## `child`
    /// a child of `self`
    #[doc(alias = "gtk_flow_box_unselect_child")]
    fn unselect_child(&self, child: &impl IsA<FlowBoxChild>) {
        unsafe {
            ffi::gtk_flow_box_unselect_child(
                self.as_ref().to_glib_none().0,
                child.as_ref().to_glib_none().0,
            );
        }
    }

    /// The ::activate-cursor-child signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user activates the `box_`.
    #[doc(alias = "activate-cursor-child")]
    fn connect_activate_cursor_child<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn activate_cursor_child_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"activate-cursor-child\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    activate_cursor_child_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_activate_cursor_child(&self) {
        self.emit_by_name::<()>("activate-cursor-child", &[]);
    }

    /// The ::child-activated signal is emitted when a child has been
    /// activated by the user.
    /// ## `child`
    /// the child that is activated
    #[doc(alias = "child-activated")]
    fn connect_child_activated<F: Fn(&Self, &FlowBoxChild) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn child_activated_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P, &FlowBoxChild) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            child: *mut ffi::GtkFlowBoxChild,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                FlowBox::from_glib_borrow(this).unsafe_cast_ref(),
                &from_glib_borrow(child),
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"child-activated\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    child_activated_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// The ::move-cursor signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted when the user initiates a cursor movement.
    ///
    /// Applications should not connect to it, but may emit it with
    /// `g_signal_emit_by_name()` if they need to control the cursor
    /// programmatically.
    ///
    /// The default bindings for this signal come in two variants,
    /// the variant with the Shift modifier extends the selection,
    /// the variant without the Shift modifer does not.
    /// There are too many key combinations to list them all here.
    /// - Arrow keys move by individual children
    /// - Home/End keys move to the ends of the box
    /// - PageUp/PageDown keys move vertically by pages
    /// ## `step`
    /// the granularity fo the move, as a [`MovementStep`][crate::MovementStep]
    /// ## `count`
    /// the number of `step` units to move
    ///
    /// # Returns
    ///
    /// [`true`] to stop other handlers from being invoked for the event.
    /// [`false`] to propagate the event further.
    #[doc(alias = "move-cursor")]
    fn connect_move_cursor<F: Fn(&Self, MovementStep, i32) -> bool + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn move_cursor_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P, MovementStep, i32) -> bool + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            step: ffi::GtkMovementStep,
            count: libc::c_int,
            f: glib::ffi::gpointer,
        ) -> glib::ffi::gboolean {
            let f: &F = &*(f as *const F);
            f(
                FlowBox::from_glib_borrow(this).unsafe_cast_ref(),
                from_glib(step),
                count,
            )
            .into_glib()
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"move-cursor\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    move_cursor_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_move_cursor(&self, step: MovementStep, count: i32) -> bool {
        self.emit_by_name("move-cursor", &[&step, &count])
    }

    /// The ::select-all signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to select all children of the box, if
    /// the selection mode permits it.
    ///
    /// The default bindings for this signal is Ctrl-a.
    #[doc(alias = "select-all")]
    fn connect_select_all<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn select_all_trampoline<P: IsA<FlowBox>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFlowBox,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"select-all\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    select_all_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_select_all(&self) {
        self.emit_by_name::<()>("select-all", &[]);
    }

    /// The ::selected-children-changed signal is emitted when the
    /// set of selected children changes.
    ///
    /// Use [`selected_foreach()`][Self::selected_foreach()] or
    /// [`selected_children()`][Self::selected_children()] to obtain the
    /// selected children.
    #[doc(alias = "selected-children-changed")]
    fn connect_selected_children_changed<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn selected_children_changed_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"selected-children-changed\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    selected_children_changed_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// The ::toggle-cursor-child signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which toggles the selection of the child that has the focus.
    ///
    /// The default binding for this signal is Ctrl-Space.
    #[doc(alias = "toggle-cursor-child")]
    fn connect_toggle_cursor_child<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn toggle_cursor_child_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"toggle-cursor-child\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    toggle_cursor_child_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_toggle_cursor_child(&self) {
        self.emit_by_name::<()>("toggle-cursor-child", &[]);
    }

    /// The ::unselect-all signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to unselect all children of the box, if
    /// the selection mode permits it.
    ///
    /// The default bindings for this signal is Ctrl-Shift-a.
    #[doc(alias = "unselect-all")]
    fn connect_unselect_all<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn unselect_all_trampoline<P: IsA<FlowBox>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFlowBox,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"unselect-all\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    unselect_all_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn emit_unselect_all(&self) {
        self.emit_by_name::<()>("unselect-all", &[]);
    }

    #[doc(alias = "activate-on-single-click")]
    fn connect_activate_on_single_click_notify<F: Fn(&Self) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_activate_on_single_click_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::activate-on-single-click\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_activate_on_single_click_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "column-spacing")]
    fn connect_column_spacing_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_column_spacing_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::column-spacing\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_column_spacing_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "homogeneous")]
    fn connect_homogeneous_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_homogeneous_trampoline<P: IsA<FlowBox>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::homogeneous\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_homogeneous_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "max-children-per-line")]
    fn connect_max_children_per_line_notify<F: Fn(&Self) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_max_children_per_line_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::max-children-per-line\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_max_children_per_line_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "min-children-per-line")]
    fn connect_min_children_per_line_notify<F: Fn(&Self) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_min_children_per_line_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::min-children-per-line\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_min_children_per_line_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "row-spacing")]
    fn connect_row_spacing_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_row_spacing_trampoline<P: IsA<FlowBox>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::row-spacing\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_row_spacing_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "selection-mode")]
    fn connect_selection_mode_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_selection_mode_trampoline<
            P: IsA<FlowBox>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFlowBox,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FlowBox::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::selection-mode\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_selection_mode_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl<O: IsA<FlowBox>> FlowBoxExt for O {}

impl fmt::Display for FlowBox {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("FlowBox")
    }
}