gtk/auto/

app_chooser_button.rs

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

use crate::{
    Align, AppChooser, Bin, Buildable, CellArea, CellEditable, CellLayout, ComboBox, Container,
    ResizeMode, SensitivityType, TreeModel, Widget, ffi,
};
use glib::{
    object::ObjectType as _,
    prelude::*,
    signal::{SignalHandlerId, connect_raw},
    translate::*,
};
use std::boxed::Box as Box_;

glib::wrapper! {
    /// The [`AppChooserButton`][crate::AppChooserButton] is a widget that lets the user select
    /// an application. It implements the [`AppChooser`][crate::AppChooser] interface.
    ///
    /// Initially, a [`AppChooserButton`][crate::AppChooserButton] selects the first application
    /// in its list, which will either be the most-recently used application
    /// or, if [`show-default-item`][struct@crate::AppChooserButton#show-default-item] is [`true`], the
    /// default application.
    ///
    /// The list of applications shown in a [`AppChooserButton`][crate::AppChooserButton] includes
    /// the recommended applications for the given content type. When
    /// [`show-default-item`][struct@crate::AppChooserButton#show-default-item] is set, the default application
    /// is also included. To let the user chooser other applications,
    /// you can set the [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item] property,
    /// which allows to open a full [`AppChooserDialog`][crate::AppChooserDialog].
    ///
    /// It is possible to add custom items to the list, using
    /// [`AppChooserButtonExt::append_custom_item()`][crate::prelude::AppChooserButtonExt::append_custom_item()]. These items cause
    /// the [`custom-item-activated`][struct@crate::AppChooserButton#custom-item-activated] signal to be
    /// emitted when they are selected.
    ///
    /// To track changes in the selected application, use the
    /// [`changed`][struct@crate::ComboBox#changed] signal.
    ///
    /// ## Properties
    ///
    ///
    /// #### `heading`
    ///  The text to show at the top of the dialog that can be
    /// opened from the button. The string may contain Pango markup.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `show-default-item`
    ///  The [`show-default-item`][struct@crate::AppChooserButton#show-default-item] property determines
    /// whether the dropdown menu should show the default application
    /// on top for the provided content type.
    ///
    /// Readable | Writable | Construct
    ///
    ///
    /// #### `show-dialog-item`
    ///  The [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item] property determines
    /// whether the dropdown menu should show an item that triggers
    /// a [`AppChooserDialog`][crate::AppChooserDialog] when clicked.
    ///
    /// Readable | Writable | Construct
    /// <details><summary><h4>ComboBox</h4></summary>
    ///
    ///
    /// #### `active`
    ///  The item which is currently active. If the model is a non-flat treemodel,
    /// and the active item is not an immediate child of the root of the tree,
    /// this property has the value
    /// `gtk_tree_path_get_indices (path)[0]`,
    /// where `path` is the [`TreePath`][crate::TreePath] of the active item.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `active-id`
    ///  The value of the ID column of the active row.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `add-tearoffs`
    ///  The add-tearoffs property controls whether generated menus
    /// have tearoff menu items.
    ///
    /// Note that this only affects menu style combo boxes.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `button-sensitivity`
    ///  Whether the dropdown button is sensitive when
    /// the model is empty.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `cell-area`
    ///  The [`CellArea`][crate::CellArea] used to layout cell renderers for this combo box.
    ///
    /// If no area is specified when creating the combo box with [`ComboBox::with_area()`][crate::ComboBox::with_area()]
    /// a horizontally oriented [`CellAreaBox`][crate::CellAreaBox] will be used.
    ///
    /// Readable | Writable | Construct Only
    ///
    ///
    /// #### `column-span-column`
    ///  If this is set to a non-negative value, it must be the index of a column
    /// of type `G_TYPE_INT` in the model. The value in that column for each item
    /// will determine how many columns that item will span in the popup.
    /// Therefore, values in this column must be greater than zero, and the sum of
    /// an item’s column position + span should not exceed [`wrap-width`][struct@crate::ComboBox#wrap-width].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `entry-text-column`
    ///  The column in the combo box's model to associate with strings from the entry
    /// if the combo was created with [`has-entry`][struct@crate::ComboBox#has-entry] = [`true`].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `has-entry`
    ///  Whether the combo box has an entry.
    ///
    /// Readable | Writable | Construct Only
    ///
    ///
    /// #### `has-frame`
    ///  The has-frame property controls whether a frame
    /// is drawn around the entry.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `id-column`
    ///  The column in the combo box's model that provides string
    /// IDs for the values in the model, if != -1.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `model`
    ///  The model from which the combo box takes the values shown
    /// in the list.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `popup-fixed-width`
    ///  Whether the popup's width should be a fixed width matching the
    /// allocated width of the combo box.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `popup-shown`
    ///  Whether the combo boxes dropdown is popped up.
    /// Note that this property is mainly useful, because
    /// it allows you to connect to notify::popup-shown.
    ///
    /// Readable
    ///
    ///
    /// #### `row-span-column`
    ///  If this is set to a non-negative value, it must be the index of a column
    /// of type `G_TYPE_INT` in the model. The value in that column for each item
    /// will determine how many rows that item will span in the popup. Therefore,
    /// values in this column must be greater than zero.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `tearoff-title`
    ///  A title that may be displayed by the window manager
    /// when the popup is torn-off.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `wrap-width`
    ///  If wrap-width is set to a positive value, items in the popup will be laid
    /// out along multiple columns, starting a new row on reaching the wrap width.
    ///
    /// Readable | Writable
    /// </details>
    /// <details><summary><h4>Container</h4></summary>
    ///
    ///
    /// #### `border-width`
    ///  Readable | Writable
    ///
    ///
    /// #### `child`
    ///  Writable
    ///
    ///
    /// #### `resize-mode`
    ///  Readable | Writable
    /// </details>
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `app-paintable`
    ///  Readable | Writable
    ///
    ///
    /// #### `can-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `can-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `composite-child`
    ///  Readable
    ///
    ///
    /// #### `double-buffered`
    ///  Whether the widget is double buffered.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `events`
    ///  Readable | Writable
    ///
    ///
    /// #### `expand`
    ///  Whether to expand in both directions. Setting this sets both [`hexpand`][struct@crate::Widget#hexpand] and [`vexpand`][struct@crate::Widget#vexpand]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `focus-on-click`
    ///  Whether the widget should grab focus when it is clicked with the mouse.
    ///
    /// This property is only relevant for widgets that can take focus.
    ///
    /// Before 3.20, several widgets (GtkButton, GtkFileChooserButton,
    /// GtkComboBox) implemented this property individually.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `halign`
    ///  How to distribute horizontal space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `has-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `has-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `has-tooltip`
    ///  Enables or disables the emission of [`query-tooltip`][struct@crate::Widget#query-tooltip] on `widget`.
    /// A value of [`true`] indicates that `widget` can have a tooltip, in this case
    /// the widget will be queried using [`query-tooltip`][struct@crate::Widget#query-tooltip] to determine
    /// whether it will provide a tooltip or not.
    ///
    /// Note that setting this property to [`true`] for the first time will change
    /// the event masks of the GdkWindows of this widget to include leave-notify
    /// and motion-notify events. This cannot and will not be undone when the
    /// property is set to [`false`] again.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `height-request`
    ///  Readable | Writable
    ///
    ///
    /// #### `hexpand`
    ///  Whether to expand horizontally. See [`WidgetExt::set_hexpand()`][crate::prelude::WidgetExt::set_hexpand()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `hexpand-set`
    ///  Whether to use the [`hexpand`][struct@crate::Widget#hexpand] property. See [`WidgetExt::is_hexpand_set()`][crate::prelude::WidgetExt::is_hexpand_set()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `is-focus`
    ///  Readable | Writable
    ///
    ///
    /// #### `margin`
    ///  Sets all four sides' margin at once. If read, returns max
    /// margin on any side.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-bottom`
    ///  Margin on bottom side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-end`
    ///  Margin on end of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-left`
    ///  Margin on left side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-right`
    ///  Margin on right side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-start`
    ///  Margin on start of widget, horizontally. This property supports
    /// left-to-right and right-to-left text directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `margin-top`
    ///  Margin on top side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [`WidgetExt::set_size_request()`][crate::prelude::WidgetExt::set_size_request()] for example.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `name`
    ///  Readable | Writable
    ///
    ///
    /// #### `no-show-all`
    ///  Readable | Writable
    ///
    ///
    /// #### `opacity`
    ///  The requested opacity of the widget. See [`WidgetExt::set_opacity()`][crate::prelude::WidgetExt::set_opacity()] for
    /// more details about window opacity.
    ///
    /// Before 3.8 this was only available in GtkWindow
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `parent`
    ///  Readable | Writable
    ///
    ///
    /// #### `receives-default`
    ///  Readable | Writable
    ///
    ///
    /// #### `scale-factor`
    ///  The scale factor of the widget. See [`WidgetExt::scale_factor()`][crate::prelude::WidgetExt::scale_factor()] for
    /// more details about widget scaling.
    ///
    /// Readable
    ///
    ///
    /// #### `sensitive`
    ///  Readable | Writable
    ///
    ///
    /// #### `style`
    ///  The style of the widget, which contains information about how it will look (colors, etc).
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `tooltip-markup`
    ///  Sets the text of tooltip to be the given string, which is marked up
    /// with the [Pango text markup language][PangoMarkupFormat].
    /// Also see [`Tooltip::set_markup()`][crate::Tooltip::set_markup()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `tooltip-text`
    ///  Sets the text of tooltip to be the given string.
    ///
    /// Also see [`Tooltip::set_text()`][crate::Tooltip::set_text()].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]: [`has-tooltip`][struct@crate::Widget#has-tooltip]
    /// will automatically be set to [`true`] and there will be taken care of
    /// [`query-tooltip`][struct@crate::Widget#query-tooltip] in the default signal handler.
    ///
    /// Note that if both [`tooltip-text`][struct@crate::Widget#tooltip-text] and [`tooltip-markup`][struct@crate::Widget#tooltip-markup]
    /// are set, the last one wins.
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `valign`
    ///  How to distribute vertical space if widget gets extra space, see [`Align`][crate::Align]
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `vexpand`
    ///  Whether to expand vertically. See [`WidgetExt::set_vexpand()`][crate::prelude::WidgetExt::set_vexpand()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `vexpand-set`
    ///  Whether to use the [`vexpand`][struct@crate::Widget#vexpand] property. See [`WidgetExt::is_vexpand_set()`][crate::prelude::WidgetExt::is_vexpand_set()].
    ///
    /// Readable | Writable
    ///
    ///
    /// #### `visible`
    ///  Readable | Writable
    ///
    ///
    /// #### `width-request`
    ///  Readable | Writable
    ///
    ///
    /// #### `window`
    ///  The widget's window if it is realized, [`None`] otherwise.
    ///
    /// Readable
    /// </details>
    /// <details><summary><h4>CellEditable</h4></summary>
    ///
    ///
    /// #### `editing-canceled`
    ///  Indicates whether editing on the cell has been canceled.
    ///
    /// Readable | Writable
    /// </details>
    /// <details><summary><h4>AppChooser</h4></summary>
    ///
    ///
    /// #### `content-type`
    ///  The content type of the [`AppChooser`][crate::AppChooser] object.
    ///
    /// See [GContentType][gio-GContentType]
    /// for more information about content types.
    ///
    /// Readable | Writable | Construct Only
    /// </details>
    ///
    /// ## Signals
    ///
    ///
    /// #### `custom-item-activated`
    ///  Emitted when a custom item, previously added with
    /// [`AppChooserButtonExt::append_custom_item()`][crate::prelude::AppChooserButtonExt::append_custom_item()], is activated from the
    /// dropdown menu.
    ///
    /// Detailed
    /// <details><summary><h4>ComboBox</h4></summary>
    ///
    ///
    /// #### `changed`
    ///  The changed signal is emitted when the active
    /// item is changed. The can be due to the user selecting
    /// a different item from the list, or due to a
    /// call to [`ComboBoxExt::set_active_iter()`][crate::prelude::ComboBoxExt::set_active_iter()].
    /// It will also be emitted while typing into the entry of a combo box
    /// with an entry.
    ///
    ///
    ///
    ///
    /// #### `format-entry-text`
    ///  For combo boxes that are created with an entry (See GtkComboBox:has-entry).
    ///
    /// A signal which allows you to change how the text displayed in a combo box's
    /// entry is displayed.
    ///
    /// Connect a signal handler which returns an allocated string representing
    /// `path`. That string will then be used to set the text in the combo box's entry.
    /// The default signal handler uses the text from the GtkComboBox::entry-text-column
    /// model column.
    ///
    /// Here's an example signal handler which fetches data from the model and
    /// displays it in the entry.
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// static gchar*
    /// format_entry_text_callback (GtkComboBox *combo,
    ///                             const gchar *path,
    ///                             gpointer     user_data)
    /// {
    ///   GtkTreeIter iter;
    ///   GtkTreeModel model;
    ///   gdouble      value;
    ///
    ///   model = gtk_combo_box_get_model (combo);
    ///
    ///   gtk_tree_model_get_iter_from_string (model, &iter, path);
    ///   gtk_tree_model_get (model, &iter,
    ///                       THE_DOUBLE_VALUE_COLUMN, &value,
    ///                       -1);
    ///
    ///   return g_strdup_printf ("%g", value);
    /// }
    /// ```
    ///
    ///
    ///
    ///
    /// #### `move-active`
    ///  The ::move-active signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to move the active selection.
    ///
    /// Action
    ///
    ///
    /// #### `popdown`
    ///  The ::popdown signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to popdown the combo box list.
    ///
    /// The default bindings for this signal are Alt+Up and Escape.
    ///
    /// Action
    ///
    ///
    /// #### `popup`
    ///  The ::popup signal is a
    /// [keybinding signal][GtkBindingSignal]
    /// which gets emitted to popup the combo box list.
    ///
    /// The default binding for this signal is Alt+Down.
    ///
    /// Action
    /// </details>
    /// <details><summary><h4>Container</h4></summary>
    ///
    ///
    /// #### `add`
    ///
    ///
    ///
    /// #### `check-resize`
    ///
    ///
    ///
    /// #### `remove`
    ///
    ///
    ///
    /// #### `set-focus-child`
    ///
    /// </details>
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `accel-closures-changed`
    ///
    ///
    ///
    /// #### `button-press-event`
    ///  The ::button-press-event signal will be emitted when a button
    /// (typically from a mouse) is pressed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the
    /// widget needs to enable the [`gdk::EventMask::BUTTON_PRESS_MASK`][crate::gdk::EventMask::BUTTON_PRESS_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `button-release-event`
    ///  The ::button-release-event signal will be emitted when a button
    /// (typically from a mouse) is released.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the
    /// widget needs to enable the [`gdk::EventMask::BUTTON_RELEASE_MASK`][crate::gdk::EventMask::BUTTON_RELEASE_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `can-activate-accel`
    ///  Determines whether an accelerator that activates the signal
    /// identified by `signal_id` can currently be activated.
    /// This signal is present to allow applications and derived
    /// widgets to override the default [`Widget`][crate::Widget] handling
    /// for determining whether an accelerator can be activated.
    ///
    ///
    ///
    ///
    /// #### `child-notify`
    ///  The ::child-notify signal is emitted for each
    /// [child property][child-properties] that has
    /// changed on an object. The signal's detail holds the property name.
    ///
    /// Detailed
    ///
    ///
    /// #### `composited-changed`
    ///  The ::composited-changed signal is emitted when the composited
    /// status of `widgets` screen changes.
    /// See [`Screen::is_composited()`][crate::gdk::Screen::is_composited()].
    ///
    /// Action
    ///
    ///
    /// #### `configure-event`
    ///  The ::configure-event signal will be emitted when the size, position or
    /// stacking of the `widget`'s window has changed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `damage-event`
    ///  Emitted when a redirected window belonging to `widget` gets drawn into.
    /// The region/area members of the event shows what area of the redirected
    /// drawable was drawn into.
    ///
    ///
    ///
    ///
    /// #### `delete-event`
    ///  The ::delete-event signal is emitted if a user requests that
    /// a toplevel window is closed. The default handler for this signal
    /// destroys the window. Connecting [`WidgetExtManual::hide_on_delete()`][crate::prelude::WidgetExtManual::hide_on_delete()] to
    /// this signal will cause the window to be hidden instead, so that
    /// it can later be shown again without reconstructing it.
    ///
    ///
    ///
    ///
    /// #### `destroy`
    ///  Signals that all holders of a reference to the widget should release
    /// the reference that they hold. May result in finalization of the widget
    /// if all references are released.
    ///
    /// This signal is not suitable for saving widget state.
    ///
    ///
    ///
    ///
    /// #### `destroy-event`
    ///  The ::destroy-event signal is emitted when a [`gdk::Window`][crate::gdk::Window] is destroyed.
    /// You rarely get this signal, because most widgets disconnect themselves
    /// from their window before they destroy it, so no widget owns the
    /// window at destroy time.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `direction-changed`
    ///  The ::direction-changed signal is emitted when the text direction
    /// of a widget changes.
    ///
    ///
    ///
    ///
    /// #### `drag-begin`
    ///  The ::drag-begin signal is emitted on the drag source when a drag is
    /// started. A typical reason to connect to this signal is to set up a
    /// custom drag icon with e.g. [`WidgetExt::drag_source_set_icon_pixbuf()`][crate::prelude::WidgetExt::drag_source_set_icon_pixbuf()].
    ///
    /// Note that some widgets set up a drag icon in the default handler of
    /// this signal, so you may have to use `g_signal_connect_after()` to
    /// override what the default handler did.
    ///
    ///
    ///
    ///
    /// #### `drag-data-delete`
    ///  The ::drag-data-delete signal is emitted on the drag source when a drag
    /// with the action [`gdk::DragAction::MOVE`][crate::gdk::DragAction::MOVE] is successfully completed. The signal
    /// handler is responsible for deleting the data that has been dropped. What
    /// "delete" means depends on the context of the drag operation.
    ///
    ///
    ///
    ///
    /// #### `drag-data-get`
    ///  The ::drag-data-get signal is emitted on the drag source when the drop
    /// site requests the data which is dragged. It is the responsibility of
    /// the signal handler to fill `data` with the data in the format which
    /// is indicated by `info`. See [`SelectionData::set()`][crate::SelectionData::set()] and
    /// [`SelectionData::set_text()`][crate::SelectionData::set_text()].
    ///
    ///
    ///
    ///
    /// #### `drag-data-received`
    ///  The ::drag-data-received signal is emitted on the drop site when the
    /// dragged data has been received. If the data was received in order to
    /// determine whether the drop will be accepted, the handler is expected
    /// to call `gdk_drag_status()` and not finish the drag.
    /// If the data was received in response to a [`drag-drop`][struct@crate::Widget#drag-drop] signal
    /// (and this is the last target to be received), the handler for this
    /// signal is expected to process the received data and then call
    /// `gtk_drag_finish()`, setting the `success` parameter depending on
    /// whether the data was processed successfully.
    ///
    /// Applications must create some means to determine why the signal was emitted
    /// and therefore whether to call `gdk_drag_status()` or `gtk_drag_finish()`.
    ///
    /// The handler may inspect the selected action with
    /// [`DragContext::selected_action()`][crate::gdk::DragContext::selected_action()] before calling
    /// `gtk_drag_finish()`, e.g. to implement [`gdk::DragAction::ASK`][crate::gdk::DragAction::ASK] as
    /// shown in the following example:
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// void
    /// drag_data_received (GtkWidget          *widget,
    ///                     GdkDragContext     *context,
    ///                     gint                x,
    ///                     gint                y,
    ///                     GtkSelectionData   *data,
    ///                     guint               info,
    ///                     guint               time)
    /// {
    ///   if ((data->length >= 0) && (data->format == 8))
    ///     {
    ///       GdkDragAction action;
    ///
    ///       // handle data here
    ///
    ///       action = gdk_drag_context_get_selected_action (context);
    ///       if (action == GDK_ACTION_ASK)
    ///         {
    ///           GtkWidget *dialog;
    ///           gint response;
    ///
    ///           dialog = gtk_message_dialog_new (NULL,
    ///                                            GTK_DIALOG_MODAL |
    ///                                            GTK_DIALOG_DESTROY_WITH_PARENT,
    ///                                            GTK_MESSAGE_INFO,
    ///                                            GTK_BUTTONS_YES_NO,
    ///                                            "Move the data ?\n");
    ///           response = gtk_dialog_run (GTK_DIALOG (dialog));
    ///           gtk_widget_destroy (dialog);
    ///
    ///           if (response == GTK_RESPONSE_YES)
    ///             action = GDK_ACTION_MOVE;
    ///           else
    ///             action = GDK_ACTION_COPY;
    ///          }
    ///
    ///       gtk_drag_finish (context, TRUE, action == GDK_ACTION_MOVE, time);
    ///     }
    ///   else
    ///     gtk_drag_finish (context, FALSE, FALSE, time);
    ///  }
    /// ```
    ///
    ///
    ///
    ///
    /// #### `drag-drop`
    ///  The ::drag-drop signal is emitted on the drop site when the user drops
    /// the data onto the widget. The signal handler must determine whether
    /// the cursor position is in a drop zone or not. If it is not in a drop
    /// zone, it returns [`false`] and no further processing is necessary.
    /// Otherwise, the handler returns [`true`]. In this case, the handler must
    /// ensure that `gtk_drag_finish()` is called to let the source know that
    /// the drop is done. The call to `gtk_drag_finish()` can be done either
    /// directly or in a [`drag-data-received`][struct@crate::Widget#drag-data-received] handler which gets
    /// triggered by calling [`WidgetExt::drag_get_data()`][crate::prelude::WidgetExt::drag_get_data()] to receive the data for one
    /// or more of the supported targets.
    ///
    ///
    ///
    ///
    /// #### `drag-end`
    ///  The ::drag-end signal is emitted on the drag source when a drag is
    /// finished. A typical reason to connect to this signal is to undo
    /// things done in [`drag-begin`][struct@crate::Widget#drag-begin].
    ///
    ///
    ///
    ///
    /// #### `drag-failed`
    ///  The ::drag-failed signal is emitted on the drag source when a drag has
    /// failed. The signal handler may hook custom code to handle a failed DnD
    /// operation based on the type of error, it returns [`true`] is the failure has
    /// been already handled (not showing the default "drag operation failed"
    /// animation), otherwise it returns [`false`].
    ///
    ///
    ///
    ///
    /// #### `drag-leave`
    ///  The ::drag-leave signal is emitted on the drop site when the cursor
    /// leaves the widget. A typical reason to connect to this signal is to
    /// undo things done in [`drag-motion`][struct@crate::Widget#drag-motion], e.g. undo highlighting
    /// with [`WidgetExt::drag_unhighlight()`][crate::prelude::WidgetExt::drag_unhighlight()].
    ///
    ///
    /// Likewise, the [`drag-leave`][struct@crate::Widget#drag-leave] signal is also emitted before the
    /// ::drag-drop signal, for instance to allow cleaning up of a preview item
    /// created in the [`drag-motion`][struct@crate::Widget#drag-motion] signal handler.
    ///
    ///
    ///
    ///
    /// #### `drag-motion`
    ///  The ::drag-motion signal is emitted on the drop site when the user
    /// moves the cursor over the widget during a drag. The signal handler
    /// must determine whether the cursor position is in a drop zone or not.
    /// If it is not in a drop zone, it returns [`false`] and no further processing
    /// is necessary. Otherwise, the handler returns [`true`]. In this case, the
    /// handler is responsible for providing the necessary information for
    /// displaying feedback to the user, by calling `gdk_drag_status()`.
    ///
    /// If the decision whether the drop will be accepted or rejected can't be
    /// made based solely on the cursor position and the type of the data, the
    /// handler may inspect the dragged data by calling [`WidgetExt::drag_get_data()`][crate::prelude::WidgetExt::drag_get_data()] and
    /// defer the `gdk_drag_status()` call to the [`drag-data-received`][struct@crate::Widget#drag-data-received]
    /// handler. Note that you must pass [`DestDefaults::DROP`][crate::DestDefaults::DROP],
    /// [`DestDefaults::MOTION`][crate::DestDefaults::MOTION] or [`DestDefaults::ALL`][crate::DestDefaults::ALL] to [`WidgetExtManual::drag_dest_set()`][crate::prelude::WidgetExtManual::drag_dest_set()]
    /// when using the drag-motion signal that way.
    ///
    /// Also note that there is no drag-enter signal. The drag receiver has to
    /// keep track of whether he has received any drag-motion signals since the
    /// last [`drag-leave`][struct@crate::Widget#drag-leave] and if not, treat the drag-motion signal as
    /// an "enter" signal. Upon an "enter", the handler will typically highlight
    /// the drop site with [`WidgetExt::drag_highlight()`][crate::prelude::WidgetExt::drag_highlight()].
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// static void
    /// drag_motion (GtkWidget      *widget,
    ///              GdkDragContext *context,
    ///              gint            x,
    ///              gint            y,
    ///              guint           time)
    /// {
    ///   GdkAtom target;
    ///
    ///   PrivateData *private_data = GET_PRIVATE_DATA (widget);
    ///
    ///   if (!private_data->drag_highlight)
    ///    {
    ///      private_data->drag_highlight = 1;
    ///      gtk_drag_highlight (widget);
    ///    }
    ///
    ///   target = gtk_drag_dest_find_target (widget, context, NULL);
    ///   if (target == GDK_NONE)
    ///     gdk_drag_status (context, 0, time);
    ///   else
    ///    {
    ///      private_data->pending_status
    ///         = gdk_drag_context_get_suggested_action (context);
    ///      gtk_drag_get_data (widget, context, target, time);
    ///    }
    ///
    ///   return TRUE;
    /// }
    ///
    /// static void
    /// drag_data_received (GtkWidget        *widget,
    ///                     GdkDragContext   *context,
    ///                     gint              x,
    ///                     gint              y,
    ///                     GtkSelectionData *selection_data,
    ///                     guint             info,
    ///                     guint             time)
    /// {
    ///   PrivateData *private_data = GET_PRIVATE_DATA (widget);
    ///
    ///   if (private_data->suggested_action)
    ///    {
    ///      private_data->suggested_action = 0;
    ///
    ///      // We are getting this data due to a request in drag_motion,
    ///      // rather than due to a request in drag_drop, so we are just
    ///      // supposed to call gdk_drag_status(), not actually paste in
    ///      // the data.
    ///
    ///      str = gtk_selection_data_get_text (selection_data);
    ///      if (!data_is_acceptable (str))
    ///        gdk_drag_status (context, 0, time);
    ///      else
    ///        gdk_drag_status (context,
    ///                         private_data->suggested_action,
    ///                         time);
    ///    }
    ///   else
    ///    {
    ///      // accept the drop
    ///    }
    /// }
    /// ```
    ///
    ///
    ///
    ///
    /// #### `draw`
    ///  This signal is emitted when a widget is supposed to render itself.
    /// The `widget`'s top left corner must be painted at the origin of
    /// the passed in context and be sized to the values returned by
    /// [`WidgetExt::allocated_width()`][crate::prelude::WidgetExt::allocated_width()] and
    /// [`WidgetExt::allocated_height()`][crate::prelude::WidgetExt::allocated_height()].
    ///
    /// Signal handlers connected to this signal can modify the cairo
    /// context passed as `cr` in any way they like and don't need to
    /// restore it. The signal emission takes care of calling `cairo_save()`
    /// before and `cairo_restore()` after invoking the handler.
    ///
    /// The signal handler will get a `cr` with a clip region already set to the
    /// widget's dirty region, i.e. to the area that needs repainting. Complicated
    /// widgets that want to avoid redrawing themselves completely can get the full
    /// extents of the clip region with `gdk_cairo_get_clip_rectangle()`, or they can
    /// get a finer-grained representation of the dirty region with
    /// `cairo_copy_clip_rectangle_list()`.
    ///
    ///
    ///
    ///
    /// #### `enter-notify-event`
    ///  The ::enter-notify-event will be emitted when the pointer enters
    /// the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::ENTER_NOTIFY_MASK`][crate::gdk::EventMask::ENTER_NOTIFY_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `event`
    ///  The GTK+ main loop will emit three signals for each GDK event delivered
    /// to a widget: one generic ::event signal, another, more specific,
    /// signal that matches the type of event delivered (e.g.
    /// [`key-press-event`][struct@crate::Widget#key-press-event]) and finally a generic
    /// [`event-after`][struct@crate::Widget#event-after] signal.
    ///
    ///
    ///
    ///
    /// #### `event-after`
    ///  After the emission of the [`event`][struct@crate::Widget#event] signal and (optionally)
    /// the second more specific signal, ::event-after will be emitted
    /// regardless of the previous two signals handlers return values.
    ///
    ///
    ///
    ///
    /// #### `focus`
    ///
    ///
    ///
    /// #### `focus-in-event`
    ///  The ::focus-in-event signal will be emitted when the keyboard focus
    /// enters the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::FOCUS_CHANGE_MASK`][crate::gdk::EventMask::FOCUS_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `focus-out-event`
    ///  The ::focus-out-event signal will be emitted when the keyboard focus
    /// leaves the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::FOCUS_CHANGE_MASK`][crate::gdk::EventMask::FOCUS_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `grab-broken-event`
    ///  Emitted when a pointer or keyboard grab on a window belonging
    /// to `widget` gets broken.
    ///
    /// On X11, this happens when the grab window becomes unviewable
    /// (i.e. it or one of its ancestors is unmapped), or if the same
    /// application grabs the pointer or keyboard again.
    ///
    ///
    ///
    ///
    /// #### `grab-focus`
    ///  Action
    ///
    ///
    /// #### `grab-notify`
    ///  The ::grab-notify signal is emitted when a widget becomes
    /// shadowed by a GTK+ grab (not a pointer or keyboard grab) on
    /// another widget, or when it becomes unshadowed due to a grab
    /// being removed.
    ///
    /// A widget is shadowed by a [`WidgetExt::grab_add()`][crate::prelude::WidgetExt::grab_add()] when the topmost
    /// grab widget in the grab stack of its window group is not
    /// its ancestor.
    ///
    ///
    ///
    ///
    /// #### `hide`
    ///  The ::hide signal is emitted when `widget` is hidden, for example with
    /// [`WidgetExt::hide()`][crate::prelude::WidgetExt::hide()].
    ///
    ///
    ///
    ///
    /// #### `hierarchy-changed`
    ///  The ::hierarchy-changed signal is emitted when the
    /// anchored state of a widget changes. A widget is
    /// “anchored” when its toplevel
    /// ancestor is a [`Window`][crate::Window]. This signal is emitted when
    /// a widget changes from un-anchored to anchored or vice-versa.
    ///
    ///
    ///
    ///
    /// #### `key-press-event`
    ///  The ::key-press-event signal is emitted when a key is pressed. The signal
    /// emission will reoccur at the key-repeat rate when the key is kept pressed.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::KEY_PRESS_MASK`][crate::gdk::EventMask::KEY_PRESS_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `key-release-event`
    ///  The ::key-release-event signal is emitted when a key is released.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::KEY_RELEASE_MASK`][crate::gdk::EventMask::KEY_RELEASE_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `keynav-failed`
    ///  Gets emitted if keyboard navigation fails.
    /// See [`WidgetExt::keynav_failed()`][crate::prelude::WidgetExt::keynav_failed()] for details.
    ///
    ///
    ///
    ///
    /// #### `leave-notify-event`
    ///  The ::leave-notify-event will be emitted when the pointer leaves
    /// the `widget`'s window.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::LEAVE_NOTIFY_MASK`][crate::gdk::EventMask::LEAVE_NOTIFY_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `map`
    ///  The ::map signal is emitted when `widget` is going to be mapped, that is
    /// when the widget is visible (which is controlled with
    /// [`WidgetExt::set_visible()`][crate::prelude::WidgetExt::set_visible()]) and all its parents up to the toplevel widget
    /// are also visible. Once the map has occurred, [`map-event`][struct@crate::Widget#map-event] will
    /// be emitted.
    ///
    /// The ::map signal can be used to determine whether a widget will be drawn,
    /// for instance it can resume an animation that was stopped during the
    /// emission of [`unmap`][struct@crate::Widget#unmap].
    ///
    ///
    ///
    ///
    /// #### `map-event`
    ///  The ::map-event signal will be emitted when the `widget`'s window is
    /// mapped. A window is mapped when it becomes visible on the screen.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `mnemonic-activate`
    ///  The default handler for this signal activates `widget` if `group_cycling`
    /// is [`false`], or just makes `widget` grab focus if `group_cycling` is [`true`].
    ///
    ///
    ///
    ///
    /// #### `motion-notify-event`
    ///  The ::motion-notify-event signal is emitted when the pointer moves
    /// over the widget's [`gdk::Window`][crate::gdk::Window].
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget
    /// needs to enable the [`gdk::EventMask::POINTER_MOTION_MASK`][crate::gdk::EventMask::POINTER_MOTION_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `move-focus`
    ///  Action
    ///
    ///
    /// #### `parent-set`
    ///  The ::parent-set signal is emitted when a new parent
    /// has been set on a widget.
    ///
    ///
    ///
    ///
    /// #### `popup-menu`
    ///  This signal gets emitted whenever a widget should pop up a context
    /// menu. This usually happens through the standard key binding mechanism;
    /// by pressing a certain key while a widget is focused, the user can cause
    /// the widget to pop up a menu. For example, the [`Entry`][crate::Entry] widget creates
    /// a menu with clipboard commands. See the
    /// [Popup Menu Migration Checklist][checklist-popup-menu]
    /// for an example of how to use this signal.
    ///
    /// Action
    ///
    ///
    /// #### `property-notify-event`
    ///  The ::property-notify-event signal will be emitted when a property on
    /// the `widget`'s window has been changed or deleted.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROPERTY_CHANGE_MASK`][crate::gdk::EventMask::PROPERTY_CHANGE_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `proximity-in-event`
    ///  To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROXIMITY_IN_MASK`][crate::gdk::EventMask::PROXIMITY_IN_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `proximity-out-event`
    ///  To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::PROXIMITY_OUT_MASK`][crate::gdk::EventMask::PROXIMITY_OUT_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `query-tooltip`
    ///  Emitted when [`has-tooltip`][struct@crate::Widget#has-tooltip] is [`true`] and the hover timeout
    /// has expired with the cursor hovering "above" `widget`; or emitted when `widget` got
    /// focus in keyboard mode.
    ///
    /// Using the given coordinates, the signal handler should determine
    /// whether a tooltip should be shown for `widget`. If this is the case
    /// [`true`] should be returned, [`false`] otherwise. Note that if
    /// `keyboard_mode` is [`true`], the values of `x` and `y` are undefined and
    /// should not be used.
    ///
    /// The signal handler is free to manipulate `tooltip` with the therefore
    /// destined function calls.
    ///
    ///
    ///
    ///
    /// #### `realize`
    ///  The ::realize signal is emitted when `widget` is associated with a
    /// [`gdk::Window`][crate::gdk::Window], which means that [`WidgetExt::realize()`][crate::prelude::WidgetExt::realize()] has been called or the
    /// widget has been mapped (that is, it is going to be drawn).
    ///
    ///
    ///
    ///
    /// #### `screen-changed`
    ///  The ::screen-changed signal gets emitted when the
    /// screen of a widget has changed.
    ///
    ///
    ///
    ///
    /// #### `scroll-event`
    ///  The ::scroll-event signal is emitted when a button in the 4 to 7
    /// range is pressed. Wheel mice are usually configured to generate
    /// button press events for buttons 4 and 5 when the wheel is turned.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::SCROLL_MASK`][crate::gdk::EventMask::SCROLL_MASK] mask.
    ///
    /// This signal will be sent to the grab widget if there is one.
    ///
    ///
    ///
    ///
    /// #### `selection-clear-event`
    ///  The ::selection-clear-event signal will be emitted when the
    /// the `widget`'s window has lost ownership of a selection.
    ///
    ///
    ///
    ///
    /// #### `selection-get`
    ///
    ///
    ///
    /// #### `selection-notify-event`
    ///
    ///
    ///
    /// #### `selection-received`
    ///
    ///
    ///
    /// #### `selection-request-event`
    ///  The ::selection-request-event signal will be emitted when
    /// another client requests ownership of the selection owned by
    /// the `widget`'s window.
    ///
    ///
    ///
    ///
    /// #### `show`
    ///  The ::show signal is emitted when `widget` is shown, for example with
    /// [`WidgetExt::show()`][crate::prelude::WidgetExt::show()].
    ///
    ///
    ///
    ///
    /// #### `show-help`
    ///  Action
    ///
    ///
    /// #### `size-allocate`
    ///
    ///
    ///
    /// #### `state-changed`
    ///  The ::state-changed signal is emitted when the widget state changes.
    /// See `gtk_widget_get_state()`.
    ///
    ///
    ///
    ///
    /// #### `state-flags-changed`
    ///  The ::state-flags-changed signal is emitted when the widget state
    /// changes, see [`WidgetExt::state_flags()`][crate::prelude::WidgetExt::state_flags()].
    ///
    ///
    ///
    ///
    /// #### `style-set`
    ///  The ::style-set signal is emitted when a new style has been set
    /// on a widget. Note that style-modifying functions like
    /// `gtk_widget_modify_base()` also cause this signal to be emitted.
    ///
    /// Note that this signal is emitted for changes to the deprecated
    /// `GtkStyle`. To track changes to the [`StyleContext`][crate::StyleContext] associated
    /// with a widget, use the [`style-updated`][struct@crate::Widget#style-updated] signal.
    ///
    ///
    ///
    ///
    /// #### `style-updated`
    ///  The ::style-updated signal is a convenience signal that is emitted when the
    /// [`changed`][struct@crate::StyleContext#changed] signal is emitted on the `widget`'s associated
    /// [`StyleContext`][crate::StyleContext] as returned by [`WidgetExt::style_context()`][crate::prelude::WidgetExt::style_context()].
    ///
    /// Note that style-modifying functions like `gtk_widget_override_color()` also
    /// cause this signal to be emitted.
    ///
    ///
    ///
    ///
    /// #### `touch-event`
    ///
    ///
    ///
    /// #### `unmap`
    ///  The ::unmap signal is emitted when `widget` is going to be unmapped, which
    /// means that either it or any of its parents up to the toplevel widget have
    /// been set as hidden.
    ///
    /// As ::unmap indicates that a widget will not be shown any longer, it can be
    /// used to, for example, stop an animation on the widget.
    ///
    ///
    ///
    ///
    /// #### `unmap-event`
    ///  The ::unmap-event signal will be emitted when the `widget`'s window is
    /// unmapped. A window is unmapped when it becomes invisible on the screen.
    ///
    /// To receive this signal, the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable this mask
    /// automatically for all new windows.
    ///
    ///
    ///
    ///
    /// #### `unrealize`
    ///  The ::unrealize signal is emitted when the [`gdk::Window`][crate::gdk::Window] associated with
    /// `widget` is destroyed, which means that [`WidgetExt::unrealize()`][crate::prelude::WidgetExt::unrealize()] has been
    /// called or the widget has been unmapped (that is, it is going to be
    /// hidden).
    ///
    ///
    ///
    ///
    /// #### `visibility-notify-event`
    ///  The ::visibility-notify-event will be emitted when the `widget`'s
    /// window is obscured or unobscured.
    ///
    /// To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget needs
    /// to enable the [`gdk::EventMask::VISIBILITY_NOTIFY_MASK`][crate::gdk::EventMask::VISIBILITY_NOTIFY_MASK] mask.
    ///
    ///
    ///
    ///
    /// #### `window-state-event`
    ///  The ::window-state-event will be emitted when the state of the
    /// toplevel window associated to the `widget` changes.
    ///
    /// To receive this signal the [`gdk::Window`][crate::gdk::Window] associated to the widget
    /// needs to enable the [`gdk::EventMask::STRUCTURE_MASK`][crate::gdk::EventMask::STRUCTURE_MASK] mask. GDK will enable
    /// this mask automatically for all new windows.
    ///
    ///
    /// </details>
    /// <details><summary><h4>CellEditable</h4></summary>
    ///
    ///
    /// #### `editing-done`
    ///  This signal is a sign for the cell renderer to update its
    /// value from the `cell_editable`.
    ///
    /// Implementations of [`CellEditable`][crate::CellEditable] are responsible for
    /// emitting this signal when they are done editing, e.g.
    /// [`Entry`][crate::Entry] emits this signal when the user presses Enter. Typical things to
    /// do in a handler for ::editing-done are to capture the edited value,
    /// disconnect the `cell_editable` from signals on the [`CellRenderer`][crate::CellRenderer], etc.
    ///
    /// [`CellEditableExt::editing_done()`][crate::prelude::CellEditableExt::editing_done()] is a convenience method
    /// for emitting [`editing-done`][struct@crate::CellEditable#editing-done].
    ///
    ///
    ///
    ///
    /// #### `remove-widget`
    ///  This signal is meant to indicate that the cell is finished
    /// editing, and the `cell_editable` widget is being removed and may
    /// subsequently be destroyed.
    ///
    /// Implementations of [`CellEditable`][crate::CellEditable] are responsible for
    /// emitting this signal when they are done editing. It must
    /// be emitted after the [`editing-done`][struct@crate::CellEditable#editing-done] signal,
    /// to give the cell renderer a chance to update the cell's value
    /// before the widget is removed.
    ///
    /// [`CellEditableExt::remove_widget()`][crate::prelude::CellEditableExt::remove_widget()] is a convenience method
    /// for emitting [`remove-widget`][struct@crate::CellEditable#remove-widget].
    ///
    ///
    /// </details>
    ///
    /// # Implements
    ///
    /// [`AppChooserButtonExt`][trait@crate::prelude::AppChooserButtonExt], [`ComboBoxExt`][trait@crate::prelude::ComboBoxExt], [`BinExt`][trait@crate::prelude::BinExt], [`ContainerExt`][trait@crate::prelude::ContainerExt], [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`CellEditableExt`][trait@crate::prelude::CellEditableExt], [`CellLayoutExt`][trait@crate::prelude::CellLayoutExt], [`AppChooserExt`][trait@crate::prelude::AppChooserExt], [`ComboBoxExtManual`][trait@crate::prelude::ComboBoxExtManual], [`ContainerExtManual`][trait@crate::prelude::ContainerExtManual], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`BuildableExtManual`][trait@crate::prelude::BuildableExtManual]
    #[doc(alias = "GtkAppChooserButton")]
    pub struct AppChooserButton(Object<ffi::GtkAppChooserButton, ffi::GtkAppChooserButtonClass>) @extends ComboBox, Bin, Container, Widget, @implements Buildable, CellEditable, CellLayout, AppChooser;

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

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

    /// Creates a new [`AppChooserButton`][crate::AppChooserButton] for applications
    /// that can handle content of the given type.
    /// ## `content_type`
    /// the content type to show applications for
    ///
    /// # Returns
    ///
    /// a newly created [`AppChooserButton`][crate::AppChooserButton]
    #[doc(alias = "gtk_app_chooser_button_new")]
    pub fn new(content_type: &str) -> AppChooserButton {
        assert_initialized_main_thread!();
        unsafe {
            Widget::from_glib_none(ffi::gtk_app_chooser_button_new(
                content_type.to_glib_none().0,
            ))
            .unsafe_cast()
        }
    }

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

impl Default for AppChooserButton {
    fn default() -> Self {
        glib::object::Object::new::<Self>()
    }
}

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

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

    /// The text to show at the top of the dialog that can be
    /// opened from the button. The string may contain Pango markup.
    pub fn heading(self, heading: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("heading", heading.into()),
        }
    }

    /// The [`show-default-item`][struct@crate::AppChooserButton#show-default-item] property determines
    /// whether the dropdown menu should show the default application
    /// on top for the provided content type.
    pub fn show_default_item(self, show_default_item: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("show-default-item", show_default_item),
        }
    }

    /// The [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item] property determines
    /// whether the dropdown menu should show an item that triggers
    /// a [`AppChooserDialog`][crate::AppChooserDialog] when clicked.
    pub fn show_dialog_item(self, show_dialog_item: bool) -> Self {
        Self {
            builder: self.builder.property("show-dialog-item", show_dialog_item),
        }
    }

    /// The item which is currently active. If the model is a non-flat treemodel,
    /// and the active item is not an immediate child of the root of the tree,
    /// this property has the value
    /// `gtk_tree_path_get_indices (path)[0]`,
    /// where `path` is the [`TreePath`][crate::TreePath] of the active item.
    pub fn active(self, active: i32) -> Self {
        Self {
            builder: self.builder.property("active", active),
        }
    }

    /// The value of the ID column of the active row.
    pub fn active_id(self, active_id: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("active-id", active_id.into()),
        }
    }

    /// Whether the dropdown button is sensitive when
    /// the model is empty.
    pub fn button_sensitivity(self, button_sensitivity: SensitivityType) -> Self {
        Self {
            builder: self
                .builder
                .property("button-sensitivity", button_sensitivity),
        }
    }

    /// The [`CellArea`][crate::CellArea] used to layout cell renderers for this combo box.
    ///
    /// If no area is specified when creating the combo box with [`ComboBox::with_area()`][crate::ComboBox::with_area()]
    /// a horizontally oriented [`CellAreaBox`][crate::CellAreaBox] will be used.
    pub fn cell_area(self, cell_area: &impl IsA<CellArea>) -> Self {
        Self {
            builder: self
                .builder
                .property("cell-area", cell_area.clone().upcast()),
        }
    }

    /// If this is set to a non-negative value, it must be the index of a column
    /// of type `G_TYPE_INT` in the model. The value in that column for each item
    /// will determine how many columns that item will span in the popup.
    /// Therefore, values in this column must be greater than zero, and the sum of
    /// an item’s column position + span should not exceed [`wrap-width`][struct@crate::ComboBox#wrap-width].
    pub fn column_span_column(self, column_span_column: i32) -> Self {
        Self {
            builder: self
                .builder
                .property("column-span-column", column_span_column),
        }
    }

    /// The column in the combo box's model to associate with strings from the entry
    /// if the combo was created with [`has-entry`][struct@crate::ComboBox#has-entry] = [`true`].
    pub fn entry_text_column(self, entry_text_column: i32) -> Self {
        Self {
            builder: self
                .builder
                .property("entry-text-column", entry_text_column),
        }
    }

    /// Whether the combo box has an entry.
    pub fn has_entry(self, has_entry: bool) -> Self {
        Self {
            builder: self.builder.property("has-entry", has_entry),
        }
    }

    /// The has-frame property controls whether a frame
    /// is drawn around the entry.
    pub fn has_frame(self, has_frame: bool) -> Self {
        Self {
            builder: self.builder.property("has-frame", has_frame),
        }
    }

    /// The column in the combo box's model that provides string
    /// IDs for the values in the model, if != -1.
    pub fn id_column(self, id_column: i32) -> Self {
        Self {
            builder: self.builder.property("id-column", id_column),
        }
    }

    /// The model from which the combo box takes the values shown
    /// in the list.
    pub fn model(self, model: &impl IsA<TreeModel>) -> Self {
        Self {
            builder: self.builder.property("model", model.clone().upcast()),
        }
    }

    /// Whether the popup's width should be a fixed width matching the
    /// allocated width of the combo box.
    pub fn popup_fixed_width(self, popup_fixed_width: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("popup-fixed-width", popup_fixed_width),
        }
    }

    /// If this is set to a non-negative value, it must be the index of a column
    /// of type `G_TYPE_INT` in the model. The value in that column for each item
    /// will determine how many rows that item will span in the popup. Therefore,
    /// values in this column must be greater than zero.
    pub fn row_span_column(self, row_span_column: i32) -> Self {
        Self {
            builder: self.builder.property("row-span-column", row_span_column),
        }
    }

    /// If wrap-width is set to a positive value, items in the popup will be laid
    /// out along multiple columns, starting a new row on reaching the wrap width.
    pub fn wrap_width(self, wrap_width: i32) -> Self {
        Self {
            builder: self.builder.property("wrap-width", wrap_width),
        }
    }

    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),
        }
    }

    /// Indicates whether editing on the cell has been canceled.
    pub fn editing_canceled(self, editing_canceled: bool) -> Self {
        Self {
            builder: self.builder.property("editing-canceled", editing_canceled),
        }
    }

    /// The content type of the [`AppChooser`][crate::AppChooser] object.
    ///
    /// See [GContentType][gio-GContentType]
    /// for more information about content types.
    pub fn content_type(self, content_type: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("content-type", content_type.into()),
        }
    }

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

/// Trait containing all [`struct@AppChooserButton`] methods.
///
/// # Implementors
///
/// [`AppChooserButton`][struct@crate::AppChooserButton]
pub trait AppChooserButtonExt: IsA<AppChooserButton> + 'static {
    /// Appends a custom item to the list of applications that is shown
    /// in the popup; the item name must be unique per-widget.
    /// Clients can use the provided name as a detail for the
    /// [`custom-item-activated`][struct@crate::AppChooserButton#custom-item-activated] signal, to add a
    /// callback for the activation of a particular custom item in the list.
    /// See also [`append_separator()`][Self::append_separator()].
    /// ## `name`
    /// the name of the custom item
    /// ## `label`
    /// the label for the custom item
    /// ## `icon`
    /// the icon for the custom item
    #[doc(alias = "gtk_app_chooser_button_append_custom_item")]
    fn append_custom_item(&self, name: &str, label: &str, icon: &impl IsA<gio::Icon>) {
        unsafe {
            ffi::gtk_app_chooser_button_append_custom_item(
                self.as_ref().to_glib_none().0,
                name.to_glib_none().0,
                label.to_glib_none().0,
                icon.as_ref().to_glib_none().0,
            );
        }
    }

    /// Appends a separator to the list of applications that is shown
    /// in the popup.
    #[doc(alias = "gtk_app_chooser_button_append_separator")]
    fn append_separator(&self) {
        unsafe {
            ffi::gtk_app_chooser_button_append_separator(self.as_ref().to_glib_none().0);
        }
    }

    /// Returns the text to display at the top of the dialog.
    ///
    /// # Returns
    ///
    /// the text to display at the top of the dialog,
    ///  or [`None`], in which case a default text is displayed
    #[doc(alias = "gtk_app_chooser_button_get_heading")]
    #[doc(alias = "get_heading")]
    fn heading(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_none(ffi::gtk_app_chooser_button_get_heading(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Returns the current value of the [`show-default-item`][struct@crate::AppChooserButton#show-default-item]
    /// property.
    ///
    /// # Returns
    ///
    /// the value of [`show-default-item`][struct@crate::AppChooserButton#show-default-item]
    #[doc(alias = "gtk_app_chooser_button_get_show_default_item")]
    #[doc(alias = "get_show_default_item")]
    #[doc(alias = "show-default-item")]
    fn shows_default_item(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_app_chooser_button_get_show_default_item(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Returns the current value of the [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item]
    /// property.
    ///
    /// # Returns
    ///
    /// the value of [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item]
    #[doc(alias = "gtk_app_chooser_button_get_show_dialog_item")]
    #[doc(alias = "get_show_dialog_item")]
    #[doc(alias = "show-dialog-item")]
    fn shows_dialog_item(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_app_chooser_button_get_show_dialog_item(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Selects a custom item previously added with
    /// [`append_custom_item()`][Self::append_custom_item()].
    ///
    /// Use [`AppChooserExtManual::refresh()`][crate::prelude::AppChooserExtManual::refresh()] to bring the selection
    /// to its initial state.
    /// ## `name`
    /// the name of the custom item
    #[doc(alias = "gtk_app_chooser_button_set_active_custom_item")]
    fn set_active_custom_item(&self, name: &str) {
        unsafe {
            ffi::gtk_app_chooser_button_set_active_custom_item(
                self.as_ref().to_glib_none().0,
                name.to_glib_none().0,
            );
        }
    }

    /// Sets the text to display at the top of the dialog.
    /// If the heading is not set, the dialog displays a default text.
    /// ## `heading`
    /// a string containing Pango markup
    #[doc(alias = "gtk_app_chooser_button_set_heading")]
    #[doc(alias = "heading")]
    fn set_heading(&self, heading: &str) {
        unsafe {
            ffi::gtk_app_chooser_button_set_heading(
                self.as_ref().to_glib_none().0,
                heading.to_glib_none().0,
            );
        }
    }

    /// Sets whether the dropdown menu of this button should show the
    /// default application for the given content type at top.
    /// ## `setting`
    /// the new value for [`show-default-item`][struct@crate::AppChooserButton#show-default-item]
    #[doc(alias = "gtk_app_chooser_button_set_show_default_item")]
    #[doc(alias = "show-default-item")]
    fn set_show_default_item(&self, setting: bool) {
        unsafe {
            ffi::gtk_app_chooser_button_set_show_default_item(
                self.as_ref().to_glib_none().0,
                setting.into_glib(),
            );
        }
    }

    /// Sets whether the dropdown menu of this button should show an
    /// entry to trigger a [`AppChooserDialog`][crate::AppChooserDialog].
    /// ## `setting`
    /// the new value for [`show-dialog-item`][struct@crate::AppChooserButton#show-dialog-item]
    #[doc(alias = "gtk_app_chooser_button_set_show_dialog_item")]
    #[doc(alias = "show-dialog-item")]
    fn set_show_dialog_item(&self, setting: bool) {
        unsafe {
            ffi::gtk_app_chooser_button_set_show_dialog_item(
                self.as_ref().to_glib_none().0,
                setting.into_glib(),
            );
        }
    }

    /// Emitted when a custom item, previously added with
    /// [`append_custom_item()`][Self::append_custom_item()], is activated from the
    /// dropdown menu.
    /// ## `item_name`
    /// the name of the activated item
    #[doc(alias = "custom-item-activated")]
    fn connect_custom_item_activated<F: Fn(&Self, &str) + 'static>(
        &self,
        detail: Option<&str>,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn custom_item_activated_trampoline<
            P: IsA<AppChooserButton>,
            F: Fn(&P, &str) + 'static,
        >(
            this: *mut ffi::GtkAppChooserButton,
            item_name: *mut std::ffi::c_char,
            f: glib::ffi::gpointer,
        ) {
            unsafe {
                let f: &F = &*(f as *const F);
                f(
                    AppChooserButton::from_glib_borrow(this).unsafe_cast_ref(),
                    &glib::GString::from_glib_borrow(item_name),
                )
            }
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            let detailed_signal_name =
                detail.map(|name| format!("custom-item-activated::{name}\0"));
            let signal_name = detailed_signal_name
                .as_ref()
                .map_or(c"custom-item-activated", |n| {
                    std::ffi::CStr::from_bytes_with_nul_unchecked(n.as_bytes())
                });
            connect_raw(
                self.as_ptr() as *mut _,
                signal_name.as_ptr(),
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    custom_item_activated_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

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

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

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

impl<O: IsA<AppChooserButton>> AppChooserButtonExt for O {}