// 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

#[cfg(any(feature = "v3_24", feature = "dox"))]
#[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
use crate::FontChooserLevel;
use glib::object::Cast;
use glib::object::IsA;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;

glib::wrapper! {
    /// [`FontChooser`][crate::FontChooser] is an interface that can be implemented by widgets
    /// displaying the list of fonts. In GTK+, the main objects
    /// that implement this interface are [`FontChooserWidget`][crate::FontChooserWidget],
    /// [`FontChooserDialog`][crate::FontChooserDialog] and [`FontButton`][crate::FontButton]. The GtkFontChooser interface
    /// has been introducted in GTK+ 3.2.
    ///
    /// # Implements
    ///
    /// [`FontChooserExt`][trait@crate::prelude::FontChooserExt]
    #[doc(alias = "GtkFontChooser")]
    pub struct FontChooser(Interface<ffi::GtkFontChooser, ffi::GtkFontChooserIface>);

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

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

/// Trait containing all [`struct@FontChooser`] methods.
///
/// # Implementors
///
/// [`FontButton`][struct@crate::FontButton], [`FontChooserDialog`][struct@crate::FontChooserDialog], [`FontChooserWidget`][struct@crate::FontChooserWidget], [`FontChooser`][struct@crate::FontChooser]
pub trait FontChooserExt: 'static {
    /// Gets the currently-selected font name.
    ///
    /// Note that this can be a different string than what you set with
    /// [`set_font()`][Self::set_font()], as the font chooser widget may
    /// normalize font names and thus return a string with a different
    /// structure. For example, “Helvetica Italic Bold 12” could be
    /// normalized to “Helvetica Bold Italic 12”.
    ///
    /// Use `pango_font_description_equal()` if you want to compare two
    /// font descriptions.
    ///
    /// # Returns
    ///
    /// A string with the name
    ///  of the current font, or [`None`] if no font is selected. You must
    ///  free this string with `g_free()`.
    #[doc(alias = "gtk_font_chooser_get_font")]
    #[doc(alias = "get_font")]
    fn font(&self) -> Option<glib::GString>;

    /// Gets the currently-selected font.
    ///
    /// Note that this can be a different string than what you set with
    /// [`set_font()`][Self::set_font()], as the font chooser widget may
    /// normalize font names and thus return a string with a different
    /// structure. For example, “Helvetica Italic Bold 12” could be
    /// normalized to “Helvetica Bold Italic 12”.
    ///
    /// Use `pango_font_description_equal()` if you want to compare two
    /// font descriptions.
    ///
    /// # Returns
    ///
    /// A [`pango::FontDescription`][crate::pango::FontDescription] for the
    ///  current font, or [`None`] if no font is selected.
    #[doc(alias = "gtk_font_chooser_get_font_desc")]
    #[doc(alias = "get_font_desc")]
    fn font_desc(&self) -> Option<pango::FontDescription>;

    /// Gets the [`pango::FontFace`][crate::pango::FontFace] representing the selected font group
    /// details (i.e. family, slant, weight, width, etc).
    ///
    /// If the selected font is not installed, returns [`None`].
    ///
    /// # Returns
    ///
    /// A [`pango::FontFace`][crate::pango::FontFace] representing the
    ///  selected font group details, or [`None`]. The returned object is owned by
    ///  `self` and must not be modified or freed.
    #[doc(alias = "gtk_font_chooser_get_font_face")]
    #[doc(alias = "get_font_face")]
    fn font_face(&self) -> Option<pango::FontFace>;

    /// Gets the [`pango::FontFamily`][crate::pango::FontFamily] representing the selected font family.
    /// Font families are a collection of font faces.
    ///
    /// If the selected font is not installed, returns [`None`].
    ///
    /// # Returns
    ///
    /// A [`pango::FontFamily`][crate::pango::FontFamily] representing the
    ///  selected font family, or [`None`]. The returned object is owned by `self`
    ///  and must not be modified or freed.
    #[doc(alias = "gtk_font_chooser_get_font_family")]
    #[doc(alias = "get_font_family")]
    fn font_family(&self) -> Option<pango::FontFamily>;

    /// Gets the currently-selected font features.
    ///
    /// # Returns
    ///
    /// the currently selected font features
    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "gtk_font_chooser_get_font_features")]
    #[doc(alias = "get_font_features")]
    fn font_features(&self) -> Option<glib::GString>;

    /// Gets the custom font map of this font chooser widget,
    /// or [`None`] if it does not have one.
    ///
    /// # Returns
    ///
    /// a [`pango::FontMap`][crate::pango::FontMap], or [`None`]
    #[doc(alias = "gtk_font_chooser_get_font_map")]
    #[doc(alias = "get_font_map")]
    fn font_map(&self) -> Option<pango::FontMap>;

    /// The selected font size.
    ///
    /// # Returns
    ///
    /// A n integer representing the selected font size,
    ///  or -1 if no font size is selected.
    #[doc(alias = "gtk_font_chooser_get_font_size")]
    #[doc(alias = "get_font_size")]
    fn font_size(&self) -> i32;

    /// Gets the language that is used for font features.
    ///
    /// # Returns
    ///
    /// the currently selected language
    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "gtk_font_chooser_get_language")]
    #[doc(alias = "get_language")]
    fn language(&self) -> Option<glib::GString>;

    /// Returns the current level of granularity for selecting fonts.
    ///
    /// # Returns
    ///
    /// the current granularity level
    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "gtk_font_chooser_get_level")]
    #[doc(alias = "get_level")]
    fn level(&self) -> FontChooserLevel;

    /// Gets the text displayed in the preview area.
    ///
    /// # Returns
    ///
    /// the text displayed in the
    ///  preview area
    #[doc(alias = "gtk_font_chooser_get_preview_text")]
    #[doc(alias = "get_preview_text")]
    fn preview_text(&self) -> Option<glib::GString>;

    /// Returns whether the preview entry is shown or not.
    ///
    /// # Returns
    ///
    /// [`true`] if the preview entry is shown
    ///  or [`false`] if it is hidden.
    #[doc(alias = "gtk_font_chooser_get_show_preview_entry")]
    #[doc(alias = "get_show_preview_entry")]
    fn shows_preview_entry(&self) -> bool;

    /// Adds a filter function that decides which fonts to display
    /// in the font chooser.
    /// ## `filter`
    /// a `GtkFontFilterFunc`, or [`None`]
    #[doc(alias = "gtk_font_chooser_set_filter_func")]
    fn set_filter_func(
        &self,
        filter: Option<Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>>,
    );

    /// Sets the currently-selected font.
    /// ## `fontname`
    /// a font name like “Helvetica 12” or “Times Bold 18”
    #[doc(alias = "gtk_font_chooser_set_font")]
    fn set_font(&self, fontname: &str);

    /// Sets the currently-selected font from `font_desc`.
    /// ## `font_desc`
    /// a [`pango::FontDescription`][crate::pango::FontDescription]
    #[doc(alias = "gtk_font_chooser_set_font_desc")]
    fn set_font_desc(&self, font_desc: &pango::FontDescription);

    /// Sets a custom font map to use for this font chooser widget.
    /// A custom font map can be used to present application-specific
    /// fonts instead of or in addition to the normal system fonts.
    ///
    ///
    ///
    /// **⚠️ The following code is in C ⚠️**
    ///
    /// ```C
    /// FcConfig *config;
    /// PangoFontMap *fontmap;
    ///
    /// config = FcInitLoadConfigAndFonts ();
    /// FcConfigAppFontAddFile (config, my_app_font_file);
    ///
    /// fontmap = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT);
    /// pango_fc_font_map_set_config (PANGO_FC_FONT_MAP (fontmap), config);
    ///
    /// gtk_font_chooser_set_font_map (font_chooser, fontmap);
    /// ```
    ///
    /// Note that other GTK+ widgets will only be able to use the application-specific
    /// font if it is present in the font map they use:
    ///
    ///
    /// ```text
    /// context = gtk_widget_get_pango_context (label);
    /// pango_context_set_font_map (context, fontmap);
    /// ```
    /// ## `fontmap`
    /// a [`pango::FontMap`][crate::pango::FontMap]
    #[doc(alias = "gtk_font_chooser_set_font_map")]
    fn set_font_map(&self, fontmap: Option<&impl IsA<pango::FontMap>>);

    /// Sets the language to use for font features.
    /// ## `language`
    /// a language
    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "gtk_font_chooser_set_language")]
    fn set_language(&self, language: &str);

    /// Sets the desired level of granularity for selecting fonts.
    /// ## `level`
    /// the desired level of granularity
    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "gtk_font_chooser_set_level")]
    fn set_level(&self, level: FontChooserLevel);

    /// Sets the text displayed in the preview area.
    /// The `text` is used to show how the selected font looks.
    /// ## `text`
    /// the text to display in the preview area
    #[doc(alias = "gtk_font_chooser_set_preview_text")]
    fn set_preview_text(&self, text: &str);

    /// Shows or hides the editable preview entry.
    /// ## `show_preview_entry`
    /// whether to show the editable preview entry or not
    #[doc(alias = "gtk_font_chooser_set_show_preview_entry")]
    fn set_show_preview_entry(&self, show_preview_entry: bool);

    /// Emitted when a font is activated.
    /// This usually happens when the user double clicks an item,
    /// or an item is selected and the user presses one of the keys
    /// Space, Shift+Space, Return or Enter.
    /// ## `fontname`
    /// the font name
    #[doc(alias = "font-activated")]
    fn connect_font_activated<F: Fn(&Self, &str) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "font")]
    fn connect_font_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "font-desc")]
    fn connect_font_desc_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "font-features")]
    fn connect_font_features_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "language")]
    fn connect_language_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "level")]
    fn connect_level_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "preview-text")]
    fn connect_preview_text_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "show-preview-entry")]
    fn connect_show_preview_entry_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<FontChooser>> FontChooserExt for O {
    fn font(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_font(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn font_desc(&self) -> Option<pango::FontDescription> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_font_desc(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn font_face(&self) -> Option<pango::FontFace> {
        unsafe {
            from_glib_none(ffi::gtk_font_chooser_get_font_face(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn font_family(&self) -> Option<pango::FontFamily> {
        unsafe {
            from_glib_none(ffi::gtk_font_chooser_get_font_family(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn font_features(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_font_features(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn font_map(&self) -> Option<pango::FontMap> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_font_map(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn font_size(&self) -> i32 {
        unsafe { ffi::gtk_font_chooser_get_font_size(self.as_ref().to_glib_none().0) }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn language(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_language(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn level(&self) -> FontChooserLevel {
        unsafe {
            from_glib(ffi::gtk_font_chooser_get_level(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn preview_text(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::gtk_font_chooser_get_preview_text(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn shows_preview_entry(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_font_chooser_get_show_preview_entry(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn set_filter_func(
        &self,
        filter: Option<Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>>,
    ) {
        let filter_data: Box_<
            Option<Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>>,
        > = Box_::new(filter);
        unsafe extern "C" fn filter_func(
            family: *const pango::ffi::PangoFontFamily,
            face: *const pango::ffi::PangoFontFace,
            data: glib::ffi::gpointer,
        ) -> glib::ffi::gboolean {
            let family = from_glib_borrow(family);
            let face = from_glib_borrow(face);
            let callback: &Option<
                Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>,
            > = &*(data as *mut _);
            let res = if let Some(ref callback) = *callback {
                callback(&family, &face)
            } else {
                panic!("cannot get closure...")
            };
            res.into_glib()
        }
        let filter = if filter_data.is_some() {
            Some(filter_func as _)
        } else {
            None
        };
        unsafe extern "C" fn destroy_func(data: glib::ffi::gpointer) {
            let _callback: Box_<
                Option<Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>>,
            > = Box_::from_raw(data as *mut _);
        }
        let destroy_call3 = Some(destroy_func as _);
        let super_callback0: Box_<
            Option<Box_<dyn Fn(&pango::FontFamily, &pango::FontFace) -> bool + 'static>>,
        > = filter_data;
        unsafe {
            ffi::gtk_font_chooser_set_filter_func(
                self.as_ref().to_glib_none().0,
                filter,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call3,
            );
        }
    }

    fn set_font(&self, fontname: &str) {
        unsafe {
            ffi::gtk_font_chooser_set_font(
                self.as_ref().to_glib_none().0,
                fontname.to_glib_none().0,
            );
        }
    }

    fn set_font_desc(&self, font_desc: &pango::FontDescription) {
        unsafe {
            ffi::gtk_font_chooser_set_font_desc(
                self.as_ref().to_glib_none().0,
                font_desc.to_glib_none().0,
            );
        }
    }

    fn set_font_map(&self, fontmap: Option<&impl IsA<pango::FontMap>>) {
        unsafe {
            ffi::gtk_font_chooser_set_font_map(
                self.as_ref().to_glib_none().0,
                fontmap.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn set_language(&self, language: &str) {
        unsafe {
            ffi::gtk_font_chooser_set_language(
                self.as_ref().to_glib_none().0,
                language.to_glib_none().0,
            );
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn set_level(&self, level: FontChooserLevel) {
        unsafe {
            ffi::gtk_font_chooser_set_level(self.as_ref().to_glib_none().0, level.into_glib());
        }
    }

    fn set_preview_text(&self, text: &str) {
        unsafe {
            ffi::gtk_font_chooser_set_preview_text(
                self.as_ref().to_glib_none().0,
                text.to_glib_none().0,
            );
        }
    }

    fn set_show_preview_entry(&self, show_preview_entry: bool) {
        unsafe {
            ffi::gtk_font_chooser_set_show_preview_entry(
                self.as_ref().to_glib_none().0,
                show_preview_entry.into_glib(),
            );
        }
    }

    fn connect_font_activated<F: Fn(&Self, &str) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn font_activated_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P, &str) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            fontname: *mut libc::c_char,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                FontChooser::from_glib_borrow(this).unsafe_cast_ref(),
                &glib::GString::from_glib_borrow(fontname),
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"font-activated\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    font_activated_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_font_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_font_trampoline<P: IsA<FontChooser>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::font\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_font_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_font_desc_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_font_desc_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::font-desc\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_font_desc_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn connect_font_features_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_font_features_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::font-features\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_font_features_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn connect_language_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_language_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::language\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_language_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    fn connect_level_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_level_trampoline<P: IsA<FontChooser>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::level\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_level_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_preview_text_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_preview_text_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::preview-text\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_preview_text_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_show_preview_entry_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_show_preview_entry_trampoline<
            P: IsA<FontChooser>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GtkFontChooser,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(FontChooser::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::show-preview-entry\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_show_preview_entry_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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