// 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::{
    Accessible, AccessibleRole, Align, Buildable, ConstraintTarget, LayoutManager, Overflow, Widget,
};
use glib::{
    prelude::*,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};
use std::{boxed::Box as Box_, fmt, mem::transmute};

glib::wrapper! {
    /// [`Expander`][crate::Expander] allows the user to reveal its child by clicking
    /// on an expander triangle.
    ///
    /// ![An example GtkExpander](expander.png)
    ///
    /// This is similar to the triangles used in a [`TreeView`][crate::TreeView].
    ///
    /// Normally you use an expander as you would use a frame; you create
    /// the child widget and use [`set_child()`][Self::set_child()] to add it
    /// to the expander. When the expander is toggled, it will take care of
    /// showing and hiding the child automatically.
    ///
    /// # Special Usage
    ///
    /// There are situations in which you may prefer to show and hide the
    /// expanded widget yourself, such as when you want to actually create
    /// the widget at expansion time. In this case, create a [`Expander`][crate::Expander]
    /// but do not add a child to it. The expander widget has an
    /// [`expanded`][struct@crate::Expander#expanded][ property which can be used to
    /// monitor its expansion state. You should watch this property with
    /// a signal connection as follows:
    ///
    /// **⚠️ The following code is in c ⚠️**
    ///
    /// ```c
    /// static void
    /// expander_callback (GObject    *object,
    ///                    GParamSpec *param_spec,
    ///                    gpointer    user_data)
    /// {
    ///   GtkExpander *expander;
    ///
    ///   expander = GTK_EXPANDER (object);
    ///
    ///   if (gtk_expander_get_expanded (expander))
    ///     {
    ///       // Show or create widgets
    ///     }
    ///   else
    ///     {
    ///       // Hide or destroy widgets
    ///     }
    /// }
    ///
    /// static void
    /// create_expander (void)
    /// {
    ///   GtkWidget *expander = gtk_expander_new_with_mnemonic ("_More Options");
    ///   g_signal_connect (expander, "notify::expanded",
    ///                     G_CALLBACK (expander_callback), NULL);
    ///
    ///   // ...
    /// }
    /// ```
    ///
    /// # GtkExpander as GtkBuildable
    ///
    /// The [`Expander`][crate::Expander] implementation of the [`Buildable`][crate::Buildable] interface supports
    /// placing a child in the label position by specifying “label” as the
    /// “type” attribute of a `<child>` element. A normal content child can be
    /// specified without specifying a `<child>` type attribute.
    ///
    /// An example of a UI definition fragment with GtkExpander:
    ///
    /// ```xml
    /// <object class="GtkExpander">
    ///   <child type="label">
    ///     <object class="GtkLabel" id="expander-label"/>
    ///   </child>
    ///   <child>
    ///     <object class="GtkEntry" id="expander-content"/>
    ///   </child>
    /// </object>
    /// ```
    ///
    /// # CSS nodes
    ///
    /// ```text
    /// expander
    /// ╰── box
    ///     ├── title
    ///     │   ├── arrow
    ///     │   ╰── <label widget>
    ///     ╰── <child>
    /// ```
    ///
    /// [`Expander`][crate::Expander] has three CSS nodes, the main node with the name expander,
    /// a subnode with name title and node below it with name arrow. The arrow of an
    /// expander that is showing its child gets the :checked pseudoclass added to it.
    ///
    /// # Accessibility
    ///
    /// [`Expander`][crate::Expander] uses the [`AccessibleRole::Button`][crate::AccessibleRole::Button] role.
    ///
    /// ## Properties
    ///
    ///
    /// #### `child`
    ///  The child widget.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `expanded`
    ///  Whether the expander has been opened to reveal the child.
    ///
    /// Readable | Writeable | Construct
    ///
    ///
    /// #### `label`
    ///  The text of the expanders label.
    ///
    /// Readable | Writeable | Construct
    ///
    ///
    /// #### `label-widget`
    ///  A widget to display instead of the usual expander label.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `resize-toplevel`
    ///  When this property is [`true`], the expander will resize the toplevel
    /// widget containing the expander upon expanding and collapsing.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `use-markup`
    ///  Whether the text in the label is Pango markup.
    ///
    /// Readable | Writeable | Construct
    ///
    ///
    /// #### `use-underline`
    ///  Whether an underline in the text indicates a mnemonic.
    ///
    /// Readable | Writeable | Construct
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `can-focus`
    ///  Whether the widget or any of its descendents can accept
    /// the input focus.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `can-target`
    ///  Whether the widget can receive pointer events.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `css-classes`
    ///  A list of css classes applied to this widget.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `css-name`
    ///  The name of this widget in the CSS tree.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    ///
    /// Readable | Writeable | Construct Only
    ///
    ///
    /// #### `cursor`
    ///  The cursor used by @widget.
    ///
    /// 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.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `focusable`
    ///  Whether this widget itself will accept the input focus.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `halign`
    ///  How to distribute horizontal space if widget gets extra space.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `has-default`
    ///  Whether the widget is the default widget.
    ///
    /// Readable
    ///
    ///
    /// #### `has-focus`
    ///  Whether the widget has the input focus.
    ///
    /// Readable
    ///
    ///
    /// #### `has-tooltip`
    ///  Enables or disables the emission of the ::query-tooltip signal 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.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `height-request`
    ///  Override for height request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `hexpand`
    ///  Whether to expand horizontally.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `hexpand-set`
    ///  Whether to use the `hexpand` property.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `layout-manager`
    ///  The [`LayoutManager`][crate::LayoutManager] instance to use to compute the preferred size
    /// of the widget, and allocate its children.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    ///
    /// 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-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`
    ///  The name of the widget.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `opacity`
    ///  The requested opacity of the widget.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `overflow`
    ///  How content outside the widget's content area is treated.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `parent`
    ///  The parent widget of this widget.
    ///
    /// Readable
    ///
    ///
    /// #### `receives-default`
    ///  Whether the widget will receive the default action when it is focused.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `root`
    ///  The [`Root`][crate::Root] widget of the widget tree containing this widget.
    ///
    /// This will be [`None`] if the widget is not contained in a root widget.
    ///
    /// Readable
    ///
    ///
    /// #### `scale-factor`
    ///  The scale factor of the widget.
    ///
    /// Readable
    ///
    ///
    /// #### `sensitive`
    ///  Whether the widget responds to input.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `tooltip-markup`
    ///  Sets the text of tooltip to be the given string, which is marked up
    /// with Pango markup.
    ///
    /// 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.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `vexpand`
    ///  Whether to expand vertically.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `vexpand-set`
    ///  Whether to use the `vexpand` property.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `visible`
    ///  Whether the widget is visible.
    ///
    /// Readable | Writeable
    ///
    ///
    /// #### `width-request`
    ///  Override for width request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    ///
    /// Readable | Writeable
    /// </details>
    /// <details><summary><h4>Accessible</h4></summary>
    ///
    ///
    /// #### `accessible-role`
    ///  The accessible role of the given [`Accessible`][crate::Accessible] implementation.
    ///
    /// The accessible role cannot be changed once set.
    ///
    /// Readable | Writeable
    /// </details>
    ///
    /// ## Signals
    ///
    ///
    /// #### `activate`
    ///  Activates the [`Expander`][crate::Expander].
    ///
    /// Action
    /// <details><summary><h4>Widget</h4></summary>
    ///
    ///
    /// #### `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.
    ///
    ///
    ///
    ///
    /// #### `direction-changed`
    ///  Emitted when the text direction of a widget changes.
    ///
    ///
    ///
    ///
    /// #### `hide`
    ///  Emitted when @widget is hidden.
    ///
    ///
    ///
    ///
    /// #### `keynav-failed`
    ///  Emitted if keyboard navigation fails.
    ///
    /// See [`WidgetExt::keynav_failed()`][crate::prelude::WidgetExt::keynav_failed()] for details.
    ///
    ///
    ///
    ///
    /// #### `map`
    ///  Emitted when @widget is going to be mapped.
    ///
    /// A widget is mapped when the widget is visible (which is controlled with
    /// [`visible`][struct@crate::Widget#visible]) and all its parents up to the toplevel widget
    /// are also visible.
    ///
    /// 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].
    ///
    ///
    ///
    ///
    /// #### `mnemonic-activate`
    ///  Emitted when a widget is activated via a mnemonic.
    ///
    /// The default handler for this signal activates @widget if @group_cycling
    /// is [`false`], or just makes @widget grab focus if @group_cycling is [`true`].
    ///
    ///
    ///
    ///
    /// #### `move-focus`
    ///  Emitted when the focus is moved.
    ///
    /// Action
    ///
    ///
    /// #### `query-tooltip`
    ///  Emitted when the widgets tooltip is about to be shown.
    ///
    /// This happens when the [`has-tooltip`][struct@crate::Widget#has-tooltip] property
    /// 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`
    ///  Emitted when @widget is associated with a [`gdk::Surface`][crate::gdk::Surface].
    ///
    /// This 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).
    ///
    ///
    ///
    ///
    /// #### `show`
    ///  Emitted when @widget is shown.
    ///
    ///
    ///
    ///
    /// #### `state-flags-changed`
    ///  Emitted when the widget state changes.
    ///
    /// See [`WidgetExt::state_flags()`][crate::prelude::WidgetExt::state_flags()].
    ///
    ///
    ///
    ///
    /// #### `unmap`
    ///  Emitted when @widget is going to be unmapped.
    ///
    /// A widget is unmapped when 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.
    ///
    ///
    ///
    ///
    /// #### `unrealize`
    ///  Emitted when the [`gdk::Surface`][crate::gdk::Surface] associated with @widget is destroyed.
    ///
    /// This 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).
    ///
    ///
    /// </details>
    ///
    /// # Implements
    ///
    /// [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`AccessibleExt`][trait@crate::prelude::AccessibleExt], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`ConstraintTargetExt`][trait@crate::prelude::ConstraintTargetExt], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`AccessibleExtManual`][trait@crate::prelude::AccessibleExtManual]
    #[doc(alias = "GtkExpander")]
    pub struct Expander(Object<ffi::GtkExpander>) @extends Widget, @implements Accessible, Buildable, ConstraintTarget;

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

impl Expander {
    /// Creates a new expander using @label as the text of the label.
    /// ## `label`
    /// the text of the label
    ///
    /// # Returns
    ///
    /// a new [`Expander`][crate::Expander] widget.
    #[doc(alias = "gtk_expander_new")]
    pub fn new(label: Option<&str>) -> Expander {
        assert_initialized_main_thread!();
        unsafe {
            Widget::from_glib_none(ffi::gtk_expander_new(label.to_glib_none().0)).unsafe_cast()
        }
    }

    /// Creates a new expander using @label as the text of the label.
    ///
    /// If characters in @label are preceded by an underscore, they are
    /// underlined. If you need a literal underscore character in a label,
    /// use “__” (two underscores). The first underlined character represents
    /// a keyboard accelerator called a mnemonic.
    ///
    /// Pressing Alt and that key activates the button.
    /// ## `label`
    /// the text of the label with an underscore
    ///   in front of the mnemonic character
    ///
    /// # Returns
    ///
    /// a new [`Expander`][crate::Expander] widget.
    #[doc(alias = "gtk_expander_new_with_mnemonic")]
    #[doc(alias = "new_with_mnemonic")]
    pub fn with_mnemonic(label: &str) -> Expander {
        assert_initialized_main_thread!();
        unsafe {
            Widget::from_glib_none(ffi::gtk_expander_new_with_mnemonic(label.to_glib_none().0))
                .unsafe_cast()
        }
    }

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

    /// Gets the child widget of @self.
    ///
    /// # Returns
    ///
    /// the child widget of @self
    #[doc(alias = "gtk_expander_get_child")]
    #[doc(alias = "get_child")]
    pub fn child(&self) -> Option<Widget> {
        unsafe { from_glib_none(ffi::gtk_expander_get_child(self.to_glib_none().0)) }
    }

    /// Queries a [`Expander`][crate::Expander] and returns its current state.
    ///
    /// Returns [`true`] if the child widget is revealed.
    ///
    /// # Returns
    ///
    /// the current state of the expander
    #[doc(alias = "gtk_expander_get_expanded")]
    #[doc(alias = "get_expanded")]
    pub fn is_expanded(&self) -> bool {
        unsafe { from_glib(ffi::gtk_expander_get_expanded(self.to_glib_none().0)) }
    }

    /// Fetches the text from a label widget.
    ///
    /// This is including any embedded underlines indicating mnemonics and
    /// Pango markup, as set by [`set_label()`][Self::set_label()]. If the label
    /// text has not been set the return value will be [`None`]. This will be the
    /// case if you create an empty button with gtk_button_new() to use as a
    /// container.
    ///
    /// # Returns
    ///
    /// The text of the label widget. This string is owned
    ///   by the widget and must not be modified or freed.
    #[doc(alias = "gtk_expander_get_label")]
    #[doc(alias = "get_label")]
    pub fn label(&self) -> Option<glib::GString> {
        unsafe { from_glib_none(ffi::gtk_expander_get_label(self.to_glib_none().0)) }
    }

    /// Retrieves the label widget for the frame.
    ///
    /// # Returns
    ///
    /// the label widget
    #[doc(alias = "gtk_expander_get_label_widget")]
    #[doc(alias = "get_label_widget")]
    pub fn label_widget(&self) -> Option<Widget> {
        unsafe { from_glib_none(ffi::gtk_expander_get_label_widget(self.to_glib_none().0)) }
    }

    /// Returns whether the expander will resize the toplevel widget
    /// containing the expander upon resizing and collapsing.
    ///
    /// # Returns
    ///
    /// the “resize toplevel” setting.
    #[doc(alias = "gtk_expander_get_resize_toplevel")]
    #[doc(alias = "get_resize_toplevel")]
    pub fn resizes_toplevel(&self) -> bool {
        unsafe { from_glib(ffi::gtk_expander_get_resize_toplevel(self.to_glib_none().0)) }
    }

    /// Returns whether the label’s text is interpreted as Pango markup.
    ///
    /// # Returns
    ///
    /// [`true`] if the label’s text will be parsed for markup
    #[doc(alias = "gtk_expander_get_use_markup")]
    #[doc(alias = "get_use_markup")]
    pub fn uses_markup(&self) -> bool {
        unsafe { from_glib(ffi::gtk_expander_get_use_markup(self.to_glib_none().0)) }
    }

    /// Returns whether an underline in the text indicates a mnemonic.
    ///
    /// # Returns
    ///
    /// [`true`] if an embedded underline in the expander
    ///   label indicates the mnemonic accelerator keys
    #[doc(alias = "gtk_expander_get_use_underline")]
    #[doc(alias = "get_use_underline")]
    pub fn uses_underline(&self) -> bool {
        unsafe { from_glib(ffi::gtk_expander_get_use_underline(self.to_glib_none().0)) }
    }

    /// Sets the child widget of @self.
    /// ## `child`
    /// the child widget
    #[doc(alias = "gtk_expander_set_child")]
    pub fn set_child(&self, child: Option<&impl IsA<Widget>>) {
        unsafe {
            ffi::gtk_expander_set_child(
                self.to_glib_none().0,
                child.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    /// Sets the state of the expander.
    ///
    /// Set to [`true`], if you want the child widget to be revealed,
    /// and [`false`] if you want the child widget to be hidden.
    /// ## `expanded`
    /// whether the child widget is revealed
    #[doc(alias = "gtk_expander_set_expanded")]
    pub fn set_expanded(&self, expanded: bool) {
        unsafe {
            ffi::gtk_expander_set_expanded(self.to_glib_none().0, expanded.into_glib());
        }
    }

    /// Sets the text of the label of the expander to @label.
    ///
    /// This will also clear any previously set labels.
    /// ## `label`
    /// a string
    #[doc(alias = "gtk_expander_set_label")]
    pub fn set_label(&self, label: Option<&str>) {
        unsafe {
            ffi::gtk_expander_set_label(self.to_glib_none().0, label.to_glib_none().0);
        }
    }

    /// Set the label widget for the expander.
    ///
    /// This is the widget that will appear embedded alongside
    /// the expander arrow.
    /// ## `label_widget`
    /// the new label widget
    #[doc(alias = "gtk_expander_set_label_widget")]
    pub fn set_label_widget(&self, label_widget: Option<&impl IsA<Widget>>) {
        unsafe {
            ffi::gtk_expander_set_label_widget(
                self.to_glib_none().0,
                label_widget.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    /// Sets whether the expander will resize the toplevel widget
    /// containing the expander upon resizing and collapsing.
    /// ## `resize_toplevel`
    /// whether to resize the toplevel
    #[doc(alias = "gtk_expander_set_resize_toplevel")]
    pub fn set_resize_toplevel(&self, resize_toplevel: bool) {
        unsafe {
            ffi::gtk_expander_set_resize_toplevel(
                self.to_glib_none().0,
                resize_toplevel.into_glib(),
            );
        }
    }

    /// Sets whether the text of the label contains Pango markup.
    /// ## `use_markup`
    /// [`true`] if the label’s text should be parsed for markup
    #[doc(alias = "gtk_expander_set_use_markup")]
    pub fn set_use_markup(&self, use_markup: bool) {
        unsafe {
            ffi::gtk_expander_set_use_markup(self.to_glib_none().0, use_markup.into_glib());
        }
    }

    /// If true, an underline in the text indicates a mnemonic.
    /// ## `use_underline`
    /// [`true`] if underlines in the text indicate mnemonics
    #[doc(alias = "gtk_expander_set_use_underline")]
    pub fn set_use_underline(&self, use_underline: bool) {
        unsafe {
            ffi::gtk_expander_set_use_underline(self.to_glib_none().0, use_underline.into_glib());
        }
    }

    /// Activates the [`Expander`][crate::Expander].
    #[doc(alias = "activate")]
    pub fn connect_activate<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn activate_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"activate\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    activate_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    pub fn emit_activate(&self) {
        self.emit_by_name::<()>("activate", &[]);
    }

    #[doc(alias = "child")]
    pub fn connect_child_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_child_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::child\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_child_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "expanded")]
    pub fn connect_expanded_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_expanded_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::expanded\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_expanded_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "label")]
    pub fn connect_label_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_label_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::label\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_label_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "label-widget")]
    pub fn connect_label_widget_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_label_widget_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::label-widget\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_label_widget_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "resize-toplevel")]
    pub fn connect_resize_toplevel_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_resize_toplevel_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::resize-toplevel\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_resize_toplevel_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "use-markup")]
    pub fn connect_use_markup_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_use_markup_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::use-markup\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_use_markup_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "use-underline")]
    pub fn connect_use_underline_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_use_underline_trampoline<F: Fn(&Expander) + 'static>(
            this: *mut ffi::GtkExpander,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::use-underline\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_use_underline_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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

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

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

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

    /// Whether the expander has been opened to reveal the child.
    pub fn expanded(self, expanded: bool) -> Self {
        Self {
            builder: self.builder.property("expanded", expanded),
        }
    }

    /// The text of the expanders label.
    pub fn label(self, label: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("label", label.into()),
        }
    }

    /// A widget to display instead of the usual expander label.
    pub fn label_widget(self, label_widget: &impl IsA<Widget>) -> Self {
        Self {
            builder: self
                .builder
                .property("label-widget", label_widget.clone().upcast()),
        }
    }

    /// When this property is [`true`], the expander will resize the toplevel
    /// widget containing the expander upon expanding and collapsing.
    pub fn resize_toplevel(self, resize_toplevel: bool) -> Self {
        Self {
            builder: self.builder.property("resize-toplevel", resize_toplevel),
        }
    }

    /// Whether the text in the label is Pango markup.
    pub fn use_markup(self, use_markup: bool) -> Self {
        Self {
            builder: self.builder.property("use-markup", use_markup),
        }
    }

    /// Whether an underline in the text indicates a mnemonic.
    pub fn use_underline(self, use_underline: bool) -> Self {
        Self {
            builder: self.builder.property("use-underline", use_underline),
        }
    }

    /// Whether the widget or any of its descendents can accept
    /// the input focus.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn can_focus(self, can_focus: bool) -> Self {
        Self {
            builder: self.builder.property("can-focus", can_focus),
        }
    }

    /// Whether the widget can receive pointer events.
    pub fn can_target(self, can_target: bool) -> Self {
        Self {
            builder: self.builder.property("can-target", can_target),
        }
    }

    /// A list of css classes applied to this widget.
    pub fn css_classes(self, css_classes: impl Into<glib::StrV>) -> Self {
        Self {
            builder: self.builder.property("css-classes", css_classes.into()),
        }
    }

    /// The name of this widget in the CSS tree.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn css_name(self, css_name: impl Into<glib::GString>) -> Self {
        Self {
            builder: self.builder.property("css-name", css_name.into()),
        }
    }

    /// The cursor used by @widget.
    pub fn cursor(self, cursor: &gdk::Cursor) -> Self {
        Self {
            builder: self.builder.property("cursor", cursor.clone()),
        }
    }

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

    /// Whether this widget itself will accept the input focus.
    pub fn focusable(self, focusable: bool) -> Self {
        Self {
            builder: self.builder.property("focusable", focusable),
        }
    }

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

    /// Enables or disables the emission of the ::query-tooltip signal 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.
    pub fn has_tooltip(self, has_tooltip: bool) -> Self {
        Self {
            builder: self.builder.property("has-tooltip", has_tooltip),
        }
    }

    /// Override for height request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    pub fn height_request(self, height_request: i32) -> Self {
        Self {
            builder: self.builder.property("height-request", height_request),
        }
    }

    /// Whether to expand horizontally.
    pub fn hexpand(self, hexpand: bool) -> Self {
        Self {
            builder: self.builder.property("hexpand", hexpand),
        }
    }

    /// Whether to use the `hexpand` property.
    pub fn hexpand_set(self, hexpand_set: bool) -> Self {
        Self {
            builder: self.builder.property("hexpand-set", hexpand_set),
        }
    }

    /// The [`LayoutManager`][crate::LayoutManager] instance to use to compute the preferred size
    /// of the widget, and allocate its children.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn layout_manager(self, layout_manager: &impl IsA<LayoutManager>) -> Self {
        Self {
            builder: self
                .builder
                .property("layout-manager", layout_manager.clone().upcast()),
        }
    }

    /// 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),
        }
    }

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

    /// The requested opacity of the widget.
    pub fn opacity(self, opacity: f64) -> Self {
        Self {
            builder: self.builder.property("opacity", opacity),
        }
    }

    /// How content outside the widget's content area is treated.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn overflow(self, overflow: Overflow) -> Self {
        Self {
            builder: self.builder.property("overflow", overflow),
        }
    }

    /// Whether the widget will receive the default action when it is focused.
    pub fn receives_default(self, receives_default: bool) -> Self {
        Self {
            builder: self.builder.property("receives-default", receives_default),
        }
    }

    /// Whether the widget responds to input.
    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 Pango markup.
    ///
    /// 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.
    pub fn valign(self, valign: Align) -> Self {
        Self {
            builder: self.builder.property("valign", valign),
        }
    }

    /// Whether to expand vertically.
    pub fn vexpand(self, vexpand: bool) -> Self {
        Self {
            builder: self.builder.property("vexpand", vexpand),
        }
    }

    /// Whether to use the `vexpand` property.
    pub fn vexpand_set(self, vexpand_set: bool) -> Self {
        Self {
            builder: self.builder.property("vexpand-set", vexpand_set),
        }
    }

    /// Whether the widget is visible.
    pub fn visible(self, visible: bool) -> Self {
        Self {
            builder: self.builder.property("visible", visible),
        }
    }

    /// Override for width request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    pub fn width_request(self, width_request: i32) -> Self {
        Self {
            builder: self.builder.property("width-request", width_request),
        }
    }

    /// The accessible role of the given [`Accessible`][crate::Accessible] implementation.
    ///
    /// The accessible role cannot be changed once set.
    pub fn accessible_role(self, accessible_role: AccessibleRole) -> Self {
        Self {
            builder: self.builder.property("accessible-role", accessible_role),
        }
    }

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

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