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

use crate::Accessible;
use crate::AccessibleRole;
use crate::Align;
use crate::Buildable;
use crate::ConstraintTarget;
use crate::LayoutManager;
use crate::Overflow;
use crate::Widget;
use glib::object::Cast;
use glib::object::IsA;
use glib::object::ObjectType as ObjectType_;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use glib::StaticType;
use glib::ToValue;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;

glib::wrapper! {
    /// [`HeaderBar`][crate::HeaderBar] is a widget for creating custom title bars for windows.
    ///
    /// ![An example GtkHeaderBar](headerbar.png)
    ///
    /// [`HeaderBar`][crate::HeaderBar] is similar to a horizontal [`CenterBox`][crate::CenterBox]. It allows
    /// children to be placed at the start or the end. In addition, it allows
    /// the window title to be displayed. The title will be centered with respect
    /// to the width of the box, even if the children at either side take up
    /// different amounts of space.
    ///
    /// [`HeaderBar`][crate::HeaderBar] can add typical window frame controls, such as minimize,
    /// maximize and close buttons, or the window icon.
    ///
    /// For these reasons, [`HeaderBar`][crate::HeaderBar] is the natural choice for use as the
    /// custom titlebar widget of a [`Window`][crate::Window] (see [`GtkWindowExt::set_titlebar()`][crate::prelude::GtkWindowExt::set_titlebar()]),
    /// as it gives features typical of titlebars while allowing the addition of
    /// child widgets.
    ///
    /// ## GtkHeaderBar as GtkBuildable
    ///
    /// The [`HeaderBar`][crate::HeaderBar] implementation of the [`Buildable`][crate::Buildable] interface supports
    /// adding children at the start or end sides by specifying “start” or “end” as
    /// the “type” attribute of a <child> element, or setting the title widget by
    /// specifying “title” value.
    ///
    /// By default the [`HeaderBar`][crate::HeaderBar] uses a [`Label`][crate::Label] displaying the title of the
    /// window it is contained in as the title widget, equivalent to the following
    /// UI definition:
    ///
    /// ```xml
    /// <object class="GtkHeaderBar">
    ///   <property name="title-widget">
    ///     <object class="GtkLabel">
    ///       <property name="label" translatable="yes">Label</property>
    ///       <property name="single-line-mode">True</property>
    ///       <property name="ellipsize">end</property>
    ///       <property name="width-chars">5</property>
    ///       <style>
    ///         <class name="title"/>
    ///       </style>
    ///     </object>
    ///   </property>
    /// </object>
    /// ```
    ///
    /// # CSS nodes
    ///
    /// ```text
    /// headerbar
    /// ╰── windowhandle
    ///     ╰── box
    ///         ├── box.start
    ///         │   ├── windowcontrols.start
    ///         │   ╰── [other children]
    ///         ├── [Title Widget]
    ///         ╰── box.end
    ///             ├── [other children]
    ///             ╰── windowcontrols.end
    /// ```
    ///
    /// A [`HeaderBar`][crate::HeaderBar]'s CSS node is called `headerbar`. It contains a `windowhandle`
    /// subnode, which contains a `box` subnode, which contains two `box` subnodes at
    /// the start and end of the header bar, as well as a center node that represents
    /// the title.
    ///
    /// Each of the boxes contains a `windowcontrols` subnode, see
    /// [`WindowControls`][crate::WindowControls] for details, as well as other children.
    ///
    /// # Accessibility
    ///
    /// [`HeaderBar`][crate::HeaderBar] uses the [`AccessibleRole::Group`][crate::AccessibleRole::Group] role.
    ///
    /// # 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 = "GtkHeaderBar")]
    pub struct HeaderBar(Object<ffi::GtkHeaderBar>) @extends Widget, @implements Accessible, Buildable, ConstraintTarget;

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

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

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

    /// Gets the decoration layout of the [`HeaderBar`][crate::HeaderBar].
    ///
    /// # Returns
    ///
    /// the decoration layout
    #[doc(alias = "gtk_header_bar_get_decoration_layout")]
    #[doc(alias = "get_decoration_layout")]
    pub fn decoration_layout(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_none(ffi::gtk_header_bar_get_decoration_layout(
                self.to_glib_none().0,
            ))
        }
    }

    /// Returns whether this header bar shows the standard window
    /// title buttons.
    ///
    /// # Returns
    ///
    /// [`true`] if title buttons are shown
    #[doc(alias = "gtk_header_bar_get_show_title_buttons")]
    #[doc(alias = "get_show_title_buttons")]
    pub fn shows_title_buttons(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_header_bar_get_show_title_buttons(
                self.to_glib_none().0,
            ))
        }
    }

    /// Retrieves the title widget of the header.
    ///
    /// See [`set_title_widget()`][Self::set_title_widget()].
    ///
    /// # Returns
    ///
    /// the title widget of the header
    #[doc(alias = "gtk_header_bar_get_title_widget")]
    #[doc(alias = "get_title_widget")]
    pub fn title_widget(&self) -> Option<Widget> {
        unsafe { from_glib_none(ffi::gtk_header_bar_get_title_widget(self.to_glib_none().0)) }
    }

    /// Adds @child to @self, packed with reference to the
    /// end of the @self.
    /// ## `child`
    /// the [`Widget`][crate::Widget] to be added to @self
    #[doc(alias = "gtk_header_bar_pack_end")]
    pub fn pack_end(&self, child: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_header_bar_pack_end(self.to_glib_none().0, child.as_ref().to_glib_none().0);
        }
    }

    /// Adds @child to @self, packed with reference to the
    /// start of the @self.
    /// ## `child`
    /// the [`Widget`][crate::Widget] to be added to @self
    #[doc(alias = "gtk_header_bar_pack_start")]
    pub fn pack_start(&self, child: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_header_bar_pack_start(self.to_glib_none().0, child.as_ref().to_glib_none().0);
        }
    }

    /// Removes a child from the [`HeaderBar`][crate::HeaderBar].
    ///
    /// The child must have been added with
    /// [`pack_start()`][Self::pack_start()],
    /// [`pack_end()`][Self::pack_end()] or
    /// [`set_title_widget()`][Self::set_title_widget()].
    /// ## `child`
    /// the child to remove
    #[doc(alias = "gtk_header_bar_remove")]
    pub fn remove(&self, child: &impl IsA<Widget>) {
        unsafe {
            ffi::gtk_header_bar_remove(self.to_glib_none().0, child.as_ref().to_glib_none().0);
        }
    }

    /// Sets the decoration layout for this header bar.
    ///
    /// This property overrides the
    /// `property::Settings::gtk-decoration-layout` setting.
    ///
    /// There can be valid reasons for overriding the setting, such
    /// as a header bar design that does not allow for buttons to take
    /// room on the right, or only offers room for a single close button.
    /// Split header bars are another example for overriding the setting.
    ///
    /// The format of the string is button names, separated by commas.
    /// A colon separates the buttons that should appear on the left
    /// from those on the right. Recognized button names are minimize,
    /// maximize, close and icon (the window icon).
    ///
    /// For example, “icon:minimize,maximize,close” specifies a icon
    /// on the left, and minimize, maximize and close buttons on the right.
    /// ## `layout`
    /// a decoration layout, or [`None`] to unset the layout
    #[doc(alias = "gtk_header_bar_set_decoration_layout")]
    pub fn set_decoration_layout(&self, layout: Option<&str>) {
        unsafe {
            ffi::gtk_header_bar_set_decoration_layout(
                self.to_glib_none().0,
                layout.to_glib_none().0,
            );
        }
    }

    /// Sets whether this header bar shows the standard window
    /// title buttons.
    /// ## `setting`
    /// [`true`] to show standard title buttons
    #[doc(alias = "gtk_header_bar_set_show_title_buttons")]
    pub fn set_show_title_buttons(&self, setting: bool) {
        unsafe {
            ffi::gtk_header_bar_set_show_title_buttons(self.to_glib_none().0, setting.into_glib());
        }
    }

    /// Sets the title for the [`HeaderBar`][crate::HeaderBar].
    ///
    /// When set to [`None`], the headerbar will display the title of
    /// the window it is contained in.
    ///
    /// The title should help a user identify the current view.
    /// To achieve the same style as the builtin title, use the
    /// “title” style class.
    ///
    /// You should set the title widget to [`None`], for the window
    /// title label to be visible again.
    /// ## `title_widget`
    /// a widget to use for a title
    #[doc(alias = "gtk_header_bar_set_title_widget")]
    pub fn set_title_widget(&self, title_widget: Option<&impl IsA<Widget>>) {
        unsafe {
            ffi::gtk_header_bar_set_title_widget(
                self.to_glib_none().0,
                title_widget.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    #[doc(alias = "decoration-layout")]
    pub fn connect_decoration_layout_notify<F: Fn(&Self) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_decoration_layout_trampoline<F: Fn(&HeaderBar) + 'static>(
            this: *mut ffi::GtkHeaderBar,
            _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::decoration-layout\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_decoration_layout_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "show-title-buttons")]
    pub fn connect_show_title_buttons_notify<F: Fn(&Self) + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn notify_show_title_buttons_trampoline<F: Fn(&HeaderBar) + 'static>(
            this: *mut ffi::GtkHeaderBar,
            _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::show-title-buttons\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_show_title_buttons_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "title-widget")]
    pub fn connect_title_widget_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_title_widget_trampoline<F: Fn(&HeaderBar) + 'static>(
            this: *mut ffi::GtkHeaderBar,
            _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::title-widget\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_title_widget_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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

#[derive(Clone, Default)]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`HeaderBar`] 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 HeaderBarBuilder {
    decoration_layout: Option<String>,
    show_title_buttons: Option<bool>,
    title_widget: Option<Widget>,
    can_focus: Option<bool>,
    can_target: Option<bool>,
    css_classes: Option<Vec<String>>,
    css_name: Option<String>,
    cursor: Option<gdk::Cursor>,
    focus_on_click: Option<bool>,
    focusable: Option<bool>,
    halign: Option<Align>,
    has_tooltip: Option<bool>,
    height_request: Option<i32>,
    hexpand: Option<bool>,
    hexpand_set: Option<bool>,
    layout_manager: Option<LayoutManager>,
    margin_bottom: Option<i32>,
    margin_end: Option<i32>,
    margin_start: Option<i32>,
    margin_top: Option<i32>,
    name: Option<String>,
    opacity: Option<f64>,
    overflow: Option<Overflow>,
    receives_default: Option<bool>,
    sensitive: Option<bool>,
    tooltip_markup: Option<String>,
    tooltip_text: Option<String>,
    valign: Option<Align>,
    vexpand: Option<bool>,
    vexpand_set: Option<bool>,
    visible: Option<bool>,
    width_request: Option<i32>,
    accessible_role: Option<AccessibleRole>,
}

impl HeaderBarBuilder {
    // rustdoc-stripper-ignore-next
    /// Create a new [`HeaderBarBuilder`].
    pub fn new() -> Self {
        Self::default()
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`HeaderBar`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> HeaderBar {
        let mut properties: Vec<(&str, &dyn ToValue)> = vec![];
        if let Some(ref decoration_layout) = self.decoration_layout {
            properties.push(("decoration-layout", decoration_layout));
        }
        if let Some(ref show_title_buttons) = self.show_title_buttons {
            properties.push(("show-title-buttons", show_title_buttons));
        }
        if let Some(ref title_widget) = self.title_widget {
            properties.push(("title-widget", title_widget));
        }
        if let Some(ref can_focus) = self.can_focus {
            properties.push(("can-focus", can_focus));
        }
        if let Some(ref can_target) = self.can_target {
            properties.push(("can-target", can_target));
        }
        if let Some(ref css_classes) = self.css_classes {
            properties.push(("css-classes", css_classes));
        }
        if let Some(ref css_name) = self.css_name {
            properties.push(("css-name", css_name));
        }
        if let Some(ref cursor) = self.cursor {
            properties.push(("cursor", cursor));
        }
        if let Some(ref focus_on_click) = self.focus_on_click {
            properties.push(("focus-on-click", focus_on_click));
        }
        if let Some(ref focusable) = self.focusable {
            properties.push(("focusable", focusable));
        }
        if let Some(ref halign) = self.halign {
            properties.push(("halign", halign));
        }
        if let Some(ref has_tooltip) = self.has_tooltip {
            properties.push(("has-tooltip", has_tooltip));
        }
        if let Some(ref height_request) = self.height_request {
            properties.push(("height-request", height_request));
        }
        if let Some(ref hexpand) = self.hexpand {
            properties.push(("hexpand", hexpand));
        }
        if let Some(ref hexpand_set) = self.hexpand_set {
            properties.push(("hexpand-set", hexpand_set));
        }
        if let Some(ref layout_manager) = self.layout_manager {
            properties.push(("layout-manager", layout_manager));
        }
        if let Some(ref margin_bottom) = self.margin_bottom {
            properties.push(("margin-bottom", margin_bottom));
        }
        if let Some(ref margin_end) = self.margin_end {
            properties.push(("margin-end", margin_end));
        }
        if let Some(ref margin_start) = self.margin_start {
            properties.push(("margin-start", margin_start));
        }
        if let Some(ref margin_top) = self.margin_top {
            properties.push(("margin-top", margin_top));
        }
        if let Some(ref name) = self.name {
            properties.push(("name", name));
        }
        if let Some(ref opacity) = self.opacity {
            properties.push(("opacity", opacity));
        }
        if let Some(ref overflow) = self.overflow {
            properties.push(("overflow", overflow));
        }
        if let Some(ref receives_default) = self.receives_default {
            properties.push(("receives-default", receives_default));
        }
        if let Some(ref sensitive) = self.sensitive {
            properties.push(("sensitive", sensitive));
        }
        if let Some(ref tooltip_markup) = self.tooltip_markup {
            properties.push(("tooltip-markup", tooltip_markup));
        }
        if let Some(ref tooltip_text) = self.tooltip_text {
            properties.push(("tooltip-text", tooltip_text));
        }
        if let Some(ref valign) = self.valign {
            properties.push(("valign", valign));
        }
        if let Some(ref vexpand) = self.vexpand {
            properties.push(("vexpand", vexpand));
        }
        if let Some(ref vexpand_set) = self.vexpand_set {
            properties.push(("vexpand-set", vexpand_set));
        }
        if let Some(ref visible) = self.visible {
            properties.push(("visible", visible));
        }
        if let Some(ref width_request) = self.width_request {
            properties.push(("width-request", width_request));
        }
        if let Some(ref accessible_role) = self.accessible_role {
            properties.push(("accessible-role", accessible_role));
        }
        glib::Object::new::<HeaderBar>(&properties)
            .expect("Failed to create an instance of HeaderBar")
    }

    /// The decoration layout for buttons.
    ///
    /// If this property is not set, the
    /// `property::Settings::gtk-decoration-layout` setting is used.
    pub fn decoration_layout(mut self, decoration_layout: &str) -> Self {
        self.decoration_layout = Some(decoration_layout.to_string());
        self
    }

    /// Whether to show title buttons like close, minimize, maximize.
    ///
    /// Which buttons are actually shown and where is determined
    /// by the `property::HeaderBar::decoration-layout` property,
    /// and by the state of the window (e.g. a close button will not
    /// be shown if the window can't be closed).
    pub fn show_title_buttons(mut self, show_title_buttons: bool) -> Self {
        self.show_title_buttons = Some(show_title_buttons);
        self
    }

    pub fn title_widget(mut self, title_widget: &impl IsA<Widget>) -> Self {
        self.title_widget = Some(title_widget.clone().upcast());
        self
    }

    /// 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(mut self, can_focus: bool) -> Self {
        self.can_focus = Some(can_focus);
        self
    }

    /// Whether the widget can receive pointer events.
    pub fn can_target(mut self, can_target: bool) -> Self {
        self.can_target = Some(can_target);
        self
    }

    /// A list of css classes applied to this widget.
    pub fn css_classes(mut self, css_classes: Vec<String>) -> Self {
        self.css_classes = Some(css_classes);
        self
    }

    /// 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(mut self, css_name: &str) -> Self {
        self.css_name = Some(css_name.to_string());
        self
    }

    /// The cursor used by @widget.
    pub fn cursor(mut self, cursor: &gdk::Cursor) -> Self {
        self.cursor = Some(cursor.clone());
        self
    }

    /// 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(mut self, focus_on_click: bool) -> Self {
        self.focus_on_click = Some(focus_on_click);
        self
    }

    /// Whether this widget itself will accept the input focus.
    pub fn focusable(mut self, focusable: bool) -> Self {
        self.focusable = Some(focusable);
        self
    }

    /// How to distribute horizontal space if widget gets extra space.
    pub fn halign(mut self, halign: Align) -> Self {
        self.halign = Some(halign);
        self
    }

    /// 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 `signal::Widget::query-tooltip` to
    /// determine whether it will provide a tooltip or not.
    pub fn has_tooltip(mut self, has_tooltip: bool) -> Self {
        self.has_tooltip = Some(has_tooltip);
        self
    }

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

    /// Whether to expand horizontally.
    pub fn hexpand(mut self, hexpand: bool) -> Self {
        self.hexpand = Some(hexpand);
        self
    }

    /// Whether to use the `hexpand` property.
    pub fn hexpand_set(mut self, hexpand_set: bool) -> Self {
        self.hexpand_set = Some(hexpand_set);
        self
    }

    /// 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(mut self, layout_manager: &impl IsA<LayoutManager>) -> Self {
        self.layout_manager = Some(layout_manager.clone().upcast());
        self
    }

    /// 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(mut self, margin_bottom: i32) -> Self {
        self.margin_bottom = Some(margin_bottom);
        self
    }

    /// 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(mut self, margin_end: i32) -> Self {
        self.margin_end = Some(margin_end);
        self
    }

    /// 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(mut self, margin_start: i32) -> Self {
        self.margin_start = Some(margin_start);
        self
    }

    /// 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(mut self, margin_top: i32) -> Self {
        self.margin_top = Some(margin_top);
        self
    }

    /// The name of the widget.
    pub fn name(mut self, name: &str) -> Self {
        self.name = Some(name.to_string());
        self
    }

    /// The requested opacity of the widget.
    pub fn opacity(mut self, opacity: f64) -> Self {
        self.opacity = Some(opacity);
        self
    }

    /// 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(mut self, overflow: Overflow) -> Self {
        self.overflow = Some(overflow);
        self
    }

    /// Whether the widget will receive the default action when it is focused.
    pub fn receives_default(mut self, receives_default: bool) -> Self {
        self.receives_default = Some(receives_default);
        self
    }

    /// Whether the widget responds to input.
    pub fn sensitive(mut self, sensitive: bool) -> Self {
        self.sensitive = Some(sensitive);
        self
    }

    /// 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`]:
    /// `property::Widget::has-tooltip` will automatically be set to [`true`]
    /// and there will be taken care of `signal::Widget::query-tooltip` in
    /// the default signal handler.
    ///
    /// Note that if both `property::Widget::tooltip-text` and
    /// `property::Widget::tooltip-markup` are set, the last one wins.
    pub fn tooltip_markup(mut self, tooltip_markup: &str) -> Self {
        self.tooltip_markup = Some(tooltip_markup.to_string());
        self
    }

    /// 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`]:
    /// `property::Widget::has-tooltip` will automatically be set to [`true`]
    /// and there will be taken care of `signal::Widget::query-tooltip` in
    /// the default signal handler.
    ///
    /// Note that if both `property::Widget::tooltip-text` and
    /// `property::Widget::tooltip-markup` are set, the last one wins.
    pub fn tooltip_text(mut self, tooltip_text: &str) -> Self {
        self.tooltip_text = Some(tooltip_text.to_string());
        self
    }

    /// How to distribute vertical space if widget gets extra space.
    pub fn valign(mut self, valign: Align) -> Self {
        self.valign = Some(valign);
        self
    }

    /// Whether to expand vertically.
    pub fn vexpand(mut self, vexpand: bool) -> Self {
        self.vexpand = Some(vexpand);
        self
    }

    /// Whether to use the `vexpand` property.
    pub fn vexpand_set(mut self, vexpand_set: bool) -> Self {
        self.vexpand_set = Some(vexpand_set);
        self
    }

    /// Whether the widget is visible.
    pub fn visible(mut self, visible: bool) -> Self {
        self.visible = Some(visible);
        self
    }

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

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

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