gtk4/subclass/

cell_area.rs

// Take a look at the license at the top of the repository in the LICENSE file.

// rustdoc-stripper-ignore-next
//! Traits intended for subclassing [`CellArea`](crate::CellArea).

use std::mem;

use glib::{translate::*, ParamSpec, Value};

use crate::{
    ffi, prelude::*, subclass::prelude::*, CellArea, CellAreaContext, CellRenderer,
    CellRendererState, DirectionType, SizeRequestMode, Snapshot, TreeIter, TreeModel, Widget,
};

#[derive(Debug)]
pub struct CellCallback {
    callback: ffi::GtkCellCallback,
    user_data: glib::ffi::gpointer,
}

impl CellCallback {
    pub fn call<R: IsA<CellRenderer>>(&self, cell_renderer: &R) -> glib::ControlFlow {
        unsafe {
            if let Some(callback) = self.callback {
                from_glib(callback(
                    cell_renderer.as_ref().to_glib_none().0,
                    self.user_data,
                ))
            } else {
                glib::ControlFlow::Break
            }
        }
    }
}

#[derive(Debug)]
pub struct CellCallbackAllocate {
    callback: ffi::GtkCellAllocCallback,
    user_data: glib::ffi::gpointer,
}

impl CellCallbackAllocate {
    pub fn call<R: IsA<CellRenderer>>(
        &self,
        cell_renderer: &R,
        cell_area: &gdk::Rectangle,
        cell_background: &gdk::Rectangle,
    ) -> glib::ControlFlow {
        unsafe {
            if let Some(callback) = self.callback {
                from_glib(callback(
                    cell_renderer.as_ref().to_glib_none().0,
                    cell_area.to_glib_none().0,
                    cell_background.to_glib_none().0,
                    self.user_data,
                ))
            } else {
                glib::ControlFlow::Break
            }
        }
    }
}

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait CellAreaImpl: CellAreaImplExt + ObjectImpl {
    fn cell_properties() -> &'static [ParamSpec] {
        &[]
    }

    /// This should be implemented to handle changes in child
    ///   cell properties for a given [`CellRenderer`][crate::CellRenderer] that were previously
    ///   installed on the [`CellAreaClass`][crate::CellAreaClass] with gtk_cell_area_class_install_cell_property().
    fn set_cell_property<R: IsA<CellRenderer>>(
        &self,
        _renderer: &R,
        _id: usize,
        _value: &Value,
        _pspec: &ParamSpec,
    ) {
        unimplemented!()
    }

    /// This should be implemented to report the values of
    ///   child cell properties for a given child [`CellRenderer`][crate::CellRenderer].
    fn cell_property<R: IsA<CellRenderer>>(
        &self,
        _renderer: &R,
        _id: usize,
        _pspec: &ParamSpec,
    ) -> Value {
        unimplemented!()
    }

    /// Activates @self, usually by activating the currently focused
    /// cell, however some subclasses which embed widgets in the area
    /// can also activate a widget if it currently has the focus.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context in context with the current row data
    /// ## `widget`
    /// the [`Widget`][crate::Widget] that @self is rendering on
    /// ## `cell_area`
    /// the size and location of @self relative to @widget’s allocation
    /// ## `flags`
    /// the [`CellRenderer`][crate::CellRenderer]State flags for @self for this row of data.
    /// ## `edit_only`
    /// if [`true`] then only cell renderers that are [`CellRendererMode::Editable`][crate::CellRendererMode::Editable]
    ///             will be activated.
    ///
    /// # Returns
    ///
    /// Whether @self was successfully activated.
    fn activate<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        area: &gdk::Rectangle,
        flags: CellRendererState,
        edit_only: bool,
    ) -> bool {
        self.parent_activate(context, widget, area, flags, edit_only)
    }

    /// Adds @renderer to @self with the default child cell properties.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `renderer`
    /// the [`CellRenderer`][crate::CellRenderer] to add to @self
    fn add<R: IsA<CellRenderer>>(&self, renderer: &R) {
        self.parent_add(renderer)
    }

    /// Applies any connected attributes to the renderers in
    /// @self by pulling the values from @tree_model.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `tree_model`
    /// the [`TreeModel`][crate::TreeModel] to pull values from
    /// ## `iter`
    /// the [`TreeIter`][crate::TreeIter] in @tree_model to apply values for
    /// ## `is_expander`
    /// whether @iter has children
    /// ## `is_expanded`
    /// whether @iter is expanded in the view and
    ///               children are visible
    fn apply_attributes<M: IsA<TreeModel>>(
        &self,
        tree_model: &M,
        iter: &TreeIter,
        is_expander: bool,
        is_expanded: bool,
    ) {
        self.parent_apply_attributes(tree_model, iter, is_expander, is_expanded)
    }

    /// Creates a [`CellArea`][crate::CellArea]Context to be used with @self for
    /// all purposes. [`CellArea`][crate::CellArea]Context stores geometry information
    /// for rows for which it was operated on, it is important to use
    /// the same context for the same row of data at all times (i.e.
    /// one should render and handle events with the same [`CellArea`][crate::CellArea]Context
    /// which was used to request the size of those rows of data).
    ///
    /// # Deprecated since 4.10
    ///
    ///
    /// # Returns
    ///
    /// a newly created [`CellArea`][crate::CellArea]Context which can be used with @self.
    fn create_context(&self) -> Option<CellAreaContext> {
        self.parent_create_context()
    }

    /// This is sometimes needed for cases where rows need to share
    /// alignments in one orientation but may be separately grouped
    /// in the opposing orientation.
    ///
    /// For instance, [`IconView`][crate::IconView] creates all icons (rows) to have
    /// the same width and the cells theirin to have the same
    /// horizontal alignments. However each row of icons may have
    /// a separate collective height. [`IconView`][crate::IconView] uses this to
    /// request the heights of each row based on a context which
    /// was already used to request all the row widths that are
    /// to be displayed.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context to copy
    ///
    /// # Returns
    ///
    /// a newly created [`CellArea`][crate::CellArea]Context copy of @context.
    fn copy_context<P: IsA<CellAreaContext>>(&self, context: &P) -> Option<CellAreaContext> {
        self.parent_copy_context(context)
    }

    /// Delegates event handling to a [`CellArea`][crate::CellArea].
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context for this row of data.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] that @self is rendering to
    /// ## `event`
    /// the [`gdk::Event`][crate::gdk::Event] to handle
    /// ## `cell_area`
    /// the @widget relative coordinates for @self
    /// ## `flags`
    /// the [`CellRenderer`][crate::CellRenderer]State for @self in this row.
    ///
    /// # Returns
    ///
    /// [`true`] if the event was handled by @self.
    fn event<W: IsA<Widget>, P: IsA<CellAreaContext>>(
        &self,
        context: &P,
        widget: &W,
        event: &gdk::Event,
        area: &gdk::Rectangle,
        flags: CellRendererState,
    ) -> bool {
        self.parent_event(context, widget, event, area, flags)
    }

    /// Calls @callback for every [`CellRenderer`][crate::CellRenderer] in @self.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `callback`
    /// the `GtkCellCallback` to call
    /// ## `callback_data`
    /// user provided data pointer
    fn foreach(&self, callback: &CellCallback) {
        self.parent_foreach(callback);
    }

    /// Calls @callback for every [`CellRenderer`][crate::CellRenderer] in @self with the
    /// allocated rectangle inside @cell_area.
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context for this row of data.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] that @self is rendering to
    /// ## `cell_area`
    /// the @widget relative coordinates and size for @self
    /// ## `background_area`
    /// the @widget relative coordinates of the background area
    /// ## `callback`
    /// the `GtkCellAllocCallback` to call
    /// ## `callback_data`
    /// user provided data pointer
    fn foreach_alloc<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        area: &gdk::Rectangle,
        bg_area: &gdk::Rectangle,
        callback: &CellCallbackAllocate,
    ) {
        self.parent_foreach_alloc(context, widget, area, bg_area, callback)
    }

    /// Removes @renderer from @self.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `renderer`
    /// the [`CellRenderer`][crate::CellRenderer] to remove from @self
    fn remove<R: IsA<CellRenderer>>(&self, renderer: &R) {
        self.parent_remove(renderer)
    }

    /// Returns whether the area can do anything when activated,
    /// after applying new attributes to @self.
    ///
    /// # Deprecated since 4.10
    ///
    ///
    /// # Returns
    ///
    /// whether @self can do anything when activated.
    fn is_activatable(&self) -> bool {
        self.parent_is_activatable()
    }

    /// This should be called by the @self’s owning layout widget
    /// when focus is to be passed to @self, or moved within @self
    /// for a given @direction and row data.
    ///
    /// Implementing [`CellArea`][crate::CellArea] classes should implement this
    /// method to receive and navigate focus in its own way particular
    /// to how it lays out cells.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `direction`
    /// the [`DirectionType`][crate::DirectionType]
    ///
    /// # Returns
    ///
    /// [`true`] if focus remains inside @self as a result of this call.
    fn focus(&self, direction_type: DirectionType) -> bool {
        self.parent_focus(direction_type)
    }

    /// Gets whether the area prefers a height-for-width layout
    /// or a width-for-height layout.
    ///
    /// # Returns
    ///
    /// The [`SizeRequestMode`][crate::SizeRequestMode] preferred by @self.
    fn request_mode(&self) -> SizeRequestMode {
        self.parent_request_mode()
    }

    /// Retrieves a cell area’s initial minimum and natural width.
    ///
    /// @self will store some geometrical information in @context along the way;
    /// when requesting sizes over an arbitrary number of rows, it’s not important
    /// to check the @minimum_width and @natural_width of this call but rather to
    /// consult gtk_cell_area_context_get_preferred_width() after a series of
    /// requests.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context to perform this request with
    /// ## `widget`
    /// the [`Widget`][crate::Widget] where @self will be rendering
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_width`
    /// location to store the minimum width
    ///
    /// ## `natural_width`
    /// location to store the natural width
    fn preferred_width<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
    ) -> (i32, i32) {
        self.parent_preferred_width(context, widget)
    }

    /// Retrieves a cell area’s minimum and natural width if it would be given
    /// the specified @height.
    ///
    /// @self stores some geometrical information in @context along the way
    /// while calling gtk_cell_area_get_preferred_height(). It’s important to
    /// perform a series of gtk_cell_area_get_preferred_height() requests with
    /// @context first and then call gtk_cell_area_get_preferred_width_for_height()
    /// on each cell area individually to get the height for width of each
    /// fully requested row.
    ///
    /// If at some point, the height of a single row changes, it should be
    /// requested with gtk_cell_area_get_preferred_height() again and then
    /// the full height of the requested rows checked again with
    /// gtk_cell_area_context_get_preferred_height().
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context which has already been requested for widths.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] where @self will be rendering
    /// ## `height`
    /// the height for which to check the width of this area
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_width`
    /// location to store the minimum width
    ///
    /// ## `natural_width`
    /// location to store the natural width
    fn preferred_width_for_height<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        height: i32,
    ) -> (i32, i32) {
        self.parent_preferred_width_for_height(context, widget, height)
    }

    /// Retrieves a cell area’s initial minimum and natural height.
    ///
    /// @self will store some geometrical information in @context along the way;
    /// when requesting sizes over an arbitrary number of rows, it’s not important
    /// to check the @minimum_height and @natural_height of this call but rather to
    /// consult gtk_cell_area_context_get_preferred_height() after a series of
    /// requests.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context to perform this request with
    /// ## `widget`
    /// the [`Widget`][crate::Widget] where @self will be rendering
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_height`
    /// location to store the minimum height
    ///
    /// ## `natural_height`
    /// location to store the natural height
    fn preferred_height<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
    ) -> (i32, i32) {
        self.parent_preferred_height(context, widget)
    }

    /// Retrieves a cell area’s minimum and natural height if it would be given
    /// the specified @width.
    ///
    /// @self stores some geometrical information in @context along the way
    /// while calling gtk_cell_area_get_preferred_width(). It’s important to
    /// perform a series of gtk_cell_area_get_preferred_width() requests with
    /// @context first and then call gtk_cell_area_get_preferred_height_for_width()
    /// on each cell area individually to get the height for width of each
    /// fully requested row.
    ///
    /// If at some point, the width of a single row changes, it should be
    /// requested with gtk_cell_area_get_preferred_width() again and then
    /// the full width of the requested rows checked again with
    /// gtk_cell_area_context_get_preferred_width().
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context which has already been requested for widths.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] where @self will be rendering
    /// ## `width`
    /// the width for which to check the height of this area
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_height`
    /// location to store the minimum height
    ///
    /// ## `natural_height`
    /// location to store the natural height
    fn preferred_height_for_width<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        width: i32,
    ) -> (i32, i32) {
        self.parent_preferred_height_for_width(context, widget, width)
    }

    /// Snapshots @self’s cells according to @self’s layout onto at
    /// the given coordinates.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `context`
    /// the [`CellArea`][crate::CellArea]Context for this row of data.
    /// ## `widget`
    /// the [`Widget`][crate::Widget] that @self is rendering to
    /// ## `snapshot`
    /// the [`Snapshot`][crate::Snapshot] to draw to
    /// ## `background_area`
    /// the @widget relative coordinates for @self’s background
    /// ## `cell_area`
    /// the @widget relative coordinates for @self
    /// ## `flags`
    /// the [`CellRenderer`][crate::CellRenderer]State for @self in this row.
    /// ## `paint_focus`
    /// whether @self should paint focus on focused cells for focused rows or not.
    #[allow(clippy::too_many_arguments)]
    fn snapshot<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        snapshot: &Snapshot,
        widget: &W,
        background_area: &gdk::Rectangle,
        cellarea: &gdk::Rectangle,
        flags: CellRendererState,
        paint_focus: bool,
    ) {
        self.parent_snapshot(
            context,
            snapshot,
            widget,
            background_area,
            cellarea,
            flags,
            paint_focus,
        );
    }
}

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

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait CellAreaImplExt: sealed::Sealed + ObjectSubclass {
    // Returns true if the area was successfully activated
    fn parent_activate<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        area: &gdk::Rectangle,
        flags: CellRendererState,
        edit_only: bool,
    ) -> bool {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).activate {
                from_glib(f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    context.as_ref().to_glib_none().0,
                    widget.as_ref().to_glib_none().0,
                    area.to_glib_none().0,
                    flags.into_glib(),
                    edit_only.into_glib(),
                ))
            } else {
                false
            }
        }
    }

    fn parent_add<R: IsA<CellRenderer>>(&self, renderer: &R) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).add {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    renderer.as_ref().to_glib_none().0,
                )
            }
        }
    }

    fn parent_apply_attributes<M: IsA<TreeModel>>(
        &self,
        tree_model: &M,
        iter: &TreeIter,
        is_expander: bool,
        is_expanded: bool,
    ) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).apply_attributes {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    tree_model.as_ref().to_glib_none().0,
                    iter.to_glib_none().0 as *mut _,
                    is_expander.into_glib(),
                    is_expanded.into_glib(),
                )
            }
        }
    }

    fn parent_create_context(&self) -> Option<CellAreaContext> {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class)
                .create_context
                .expect("No parent class impl for \"create_context\"");

            let ret = f(self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0);
            Some(from_glib_full(ret))
        }
    }

    fn parent_copy_context<P: IsA<CellAreaContext>>(&self, context: &P) -> Option<CellAreaContext> {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class)
                .copy_context
                .expect("No parent class impl for \"copy_context\"");

            let ret = f(
                self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                context.as_ref().to_glib_none().0,
            );
            Some(from_glib_full(ret))
        }
    }

    // returns true only if the event is handled
    fn parent_event<W: IsA<Widget>, P: IsA<CellAreaContext>>(
        &self,
        context: &P,
        widget: &W,
        event: &gdk::Event,
        area: &gdk::Rectangle,
        flags: CellRendererState,
    ) -> bool {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).event {
                from_glib(f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    context.as_ref().to_glib_none().0,
                    widget.as_ref().to_glib_none().0,
                    event.to_glib_none().0,
                    area.to_glib_none().0,
                    flags.into_glib(),
                ))
            } else {
                false
            }
        }
    }

    fn parent_foreach(&self, callback: &CellCallback) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).foreach {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    callback.callback,
                    callback.user_data,
                )
            }
        }
    }

    fn parent_foreach_alloc<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        widget: &W,
        area: &gdk::Rectangle,
        bg_area: &gdk::Rectangle,
        callback: &CellCallbackAllocate,
    ) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).foreach_alloc {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    context.as_ref().to_glib_none().0,
                    widget.as_ref().to_glib_none().0,
                    area.to_glib_none().0,
                    bg_area.to_glib_none().0,
                    callback.callback,
                    callback.user_data,
                )
            }
        }
    }

    fn parent_remove<R: IsA<CellRenderer>>(&self, renderer: &R) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).remove {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    renderer.as_ref().to_glib_none().0,
                )
            }
        }
    }

    // Whether the cell is activatable
    fn parent_is_activatable(&self) -> bool {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).is_activatable {
                from_glib(f(self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0))
            } else {
                false
            }
        }
    }

    // TRUE if focus remains inside area as a result of this call.
    fn parent_focus(&self, direction_type: DirectionType) -> bool {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).focus {
                from_glib(f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    direction_type.into_glib(),
                ))
            } else {
                false
            }
        }
    }

    fn parent_request_mode(&self) -> SizeRequestMode {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class)
                .get_request_mode
                .expect("No parent class impl for \"get_request_mode\"");
            from_glib(f(self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0))
        }
    }

    fn parent_preferred_width<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        cell_area_context: &P,
        widget: &W,
    ) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class).get_preferred_width.unwrap();

            let mut minimum_size = mem::MaybeUninit::uninit();
            let mut natural_size = mem::MaybeUninit::uninit();
            f(
                self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                cell_area_context.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                minimum_size.as_mut_ptr(),
                natural_size.as_mut_ptr(),
            );
            (minimum_size.assume_init(), natural_size.assume_init())
        }
    }

    fn parent_preferred_height<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        cell_area_context: &P,
        widget: &W,
    ) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class).get_preferred_height.unwrap();

            let mut minimum_size = mem::MaybeUninit::uninit();
            let mut natural_size = mem::MaybeUninit::uninit();
            f(
                self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                cell_area_context.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                minimum_size.as_mut_ptr(),
                natural_size.as_mut_ptr(),
            );
            (minimum_size.assume_init(), natural_size.assume_init())
        }
    }

    fn parent_preferred_width_for_height<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        cell_area_context: &P,
        widget: &W,
        height: i32,
    ) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class).get_preferred_width_for_height.unwrap();

            let mut minimum_size = mem::MaybeUninit::uninit();
            let mut natural_size = mem::MaybeUninit::uninit();
            f(
                self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                cell_area_context.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                height,
                minimum_size.as_mut_ptr(),
                natural_size.as_mut_ptr(),
            );
            (minimum_size.assume_init(), natural_size.assume_init())
        }
    }

    fn parent_preferred_height_for_width<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        cell_area_context: &P,
        widget: &W,
        width: i32,
    ) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            let f = (*parent_class).get_preferred_height_for_width.unwrap();
            let mut minimum_size = mem::MaybeUninit::uninit();
            let mut natural_size = mem::MaybeUninit::uninit();
            f(
                self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                cell_area_context.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                width,
                minimum_size.as_mut_ptr(),
                natural_size.as_mut_ptr(),
            );
            (minimum_size.assume_init(), natural_size.assume_init())
        }
    }

    #[allow(clippy::too_many_arguments)]
    fn parent_snapshot<P: IsA<CellAreaContext>, W: IsA<Widget>>(
        &self,
        context: &P,
        snapshot: &Snapshot,
        widget: &W,
        background_area: &gdk::Rectangle,
        cellarea: &gdk::Rectangle,
        flags: CellRendererState,
        paint_focus: bool,
    ) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaClass;
            if let Some(f) = (*parent_class).snapshot {
                f(
                    self.obj().unsafe_cast_ref::<CellArea>().to_glib_none().0,
                    context.as_ref().to_glib_none().0,
                    widget.as_ref().to_glib_none().0,
                    snapshot.to_glib_none().0,
                    background_area.to_glib_none().0,
                    cellarea.to_glib_none().0,
                    flags.into_glib(),
                    paint_focus.into_glib(),
                )
            }
        }
    }
}

impl<T: CellAreaImpl> CellAreaImplExt for T {}

unsafe impl<T: CellAreaImpl> IsSubclassable<T> for CellArea {
    fn class_init(class: &mut glib::Class<Self>) {
        Self::parent_class_init::<T>(class);
        let klass = class.as_mut();

        assert_initialized_main_thread!();

        let pspecs = <T as CellAreaImpl>::cell_properties();
        if !pspecs.is_empty() {
            unsafe {
                for (prop_id, pspec) in pspecs.iter().enumerate() {
                    ffi::gtk_cell_area_class_install_cell_property(
                        klass,
                        prop_id as u32,
                        pspec.to_glib_none().0,
                    );
                }
            }
        }
        klass.activate = Some(cell_area_activate::<T>);
        klass.add = Some(cell_area_add::<T>);
        klass.apply_attributes = Some(cell_area_apply_attributes::<T>);
        klass.create_context = Some(cell_area_create_context::<T>);
        klass.copy_context = Some(cell_area_copy_context::<T>);
        klass.event = Some(cell_area_event::<T>);
        klass.foreach = Some(cell_area_foreach::<T>);
        klass.foreach_alloc = Some(cell_area_foreach_alloc::<T>);
        klass.remove = Some(cell_area_remove::<T>);
        klass.is_activatable = Some(cell_area_is_activatable::<T>);
        klass.focus = Some(cell_area_focus::<T>);
        klass.get_request_mode = Some(cell_area_get_request_mode::<T>);
        klass.get_preferred_width = Some(cell_area_get_preferred_width::<T>);
        klass.get_preferred_width_for_height = Some(cell_area_get_preferred_width_for_height::<T>);
        klass.get_preferred_height = Some(cell_area_get_preferred_height::<T>);
        klass.get_preferred_height_for_width = Some(cell_area_get_preferred_height_for_width::<T>);
        klass.snapshot = Some(cell_area_snapshot::<T>);
        klass.set_cell_property = Some(cell_area_set_cell_property::<T>);
        klass.get_cell_property = Some(cell_area_get_cell_property::<T>);
    }
}

unsafe extern "C" fn cell_area_set_cell_property<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    rendererptr: *mut ffi::GtkCellRenderer,
    id: u32,
    valueptr: *mut glib::gobject_ffi::GValue,
    pspecptr: *mut glib::gobject_ffi::GParamSpec,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    imp.set_cell_property(
        &*from_glib_borrow::<_, CellRenderer>(rendererptr),
        id as usize,
        &*(valueptr as *mut Value),
        &from_glib_borrow(pspecptr),
    );
}

unsafe extern "C" fn cell_area_get_cell_property<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    rendererptr: *mut ffi::GtkCellRenderer,
    id: u32,
    valueptr: *mut glib::gobject_ffi::GValue,
    pspecptr: *mut glib::gobject_ffi::GParamSpec,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    let value = imp.cell_property(
        &*from_glib_borrow::<_, CellRenderer>(rendererptr),
        id as usize,
        &from_glib_borrow(pspecptr),
    );

    // See glib::subclass::ObjectImpl::property for the reasoning behind
    glib::gobject_ffi::g_value_unset(valueptr);
    let value = mem::ManuallyDrop::new(value);
    std::ptr::write(valueptr, std::ptr::read(value.to_glib_none().0));
}

unsafe extern "C" fn cell_area_add<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    rendererptr: *mut ffi::GtkCellRenderer,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let renderer: Borrowed<CellRenderer> = from_glib_borrow(rendererptr);

    imp.add(&*renderer)
}

unsafe extern "C" fn cell_area_apply_attributes<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    modelptr: *mut ffi::GtkTreeModel,
    iterptr: *mut ffi::GtkTreeIter,
    is_expander: glib::ffi::gboolean,
    is_expanded: glib::ffi::gboolean,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let model: Borrowed<TreeModel> = from_glib_borrow(modelptr);
    let iter: Borrowed<TreeIter> = from_glib_borrow(iterptr);

    imp.apply_attributes(
        &*model,
        &iter,
        from_glib(is_expander),
        from_glib(is_expanded),
    )
}

unsafe extern "C" fn cell_area_remove<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    rendererptr: *mut ffi::GtkCellRenderer,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let renderer: Borrowed<CellRenderer> = from_glib_borrow(rendererptr);

    imp.remove(&*renderer)
}

unsafe extern "C" fn cell_area_is_activatable<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
) -> glib::ffi::gboolean {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    imp.is_activatable().into_glib()
}

unsafe extern "C" fn cell_area_focus<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    directionptr: ffi::GtkDirectionType,
) -> glib::ffi::gboolean {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    imp.focus(from_glib(directionptr)).into_glib()
}

unsafe extern "C" fn cell_area_get_request_mode<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
) -> ffi::GtkSizeRequestMode {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    imp.request_mode().into_glib()
}

unsafe extern "C" fn cell_area_get_preferred_height<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    minptr: *mut libc::c_int,
    natptr: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);

    let (min_size, nat_size) = imp.preferred_height(&*context, &*widget);
    if !minptr.is_null() {
        *minptr = min_size;
    }
    if !natptr.is_null() {
        *natptr = nat_size;
    }
}

unsafe extern "C" fn cell_area_get_preferred_width<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    minptr: *mut libc::c_int,
    natptr: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);

    let (min_size, nat_size) = imp.preferred_width(&*context, &*widget);
    if !minptr.is_null() {
        *minptr = min_size;
    }
    if !natptr.is_null() {
        *natptr = nat_size;
    }
}

unsafe extern "C" fn cell_area_get_preferred_width_for_height<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    height: i32,
    min_width_ptr: *mut libc::c_int,
    nat_width_ptr: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);

    let (min_width, nat_width) = imp.preferred_width_for_height(&*context, &*widget, height);
    if !min_width_ptr.is_null() {
        *min_width_ptr = min_width;
    }
    if !nat_width_ptr.is_null() {
        *nat_width_ptr = nat_width;
    }
}

unsafe extern "C" fn cell_area_get_preferred_height_for_width<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    width: i32,
    min_height_ptr: *mut libc::c_int,
    nat_height_ptr: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);

    let (min_height, nat_height) = imp.preferred_height_for_width(&*context, &*widget, width);
    if !min_height_ptr.is_null() {
        *min_height_ptr = min_height;
    }
    if !nat_height_ptr.is_null() {
        *nat_height_ptr = nat_height;
    }
}

unsafe extern "C" fn cell_area_activate<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    cellptr: *const gdk::ffi::GdkRectangle,
    flags: ffi::GtkCellRendererState,
    edit_only: glib::ffi::gboolean,
) -> glib::ffi::gboolean {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);

    imp.activate(
        &*context,
        &*widget,
        &from_glib_borrow(cellptr),
        from_glib(flags),
        from_glib(edit_only),
    )
    .into_glib()
}

unsafe extern "C" fn cell_area_snapshot<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    wdgtptr: *mut ffi::GtkWidget,
    snapshotptr: *mut ffi::GtkSnapshot,
    bgptr: *const gdk::ffi::GdkRectangle,
    cellptr: *const gdk::ffi::GdkRectangle,
    flags: ffi::GtkCellRendererState,
    paint_focus: glib::ffi::gboolean,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(wdgtptr);
    let snapshot: Borrowed<Snapshot> = from_glib_borrow(snapshotptr);

    imp.snapshot(
        &*context,
        &snapshot,
        &*widget,
        &from_glib_borrow(bgptr),
        &from_glib_borrow(cellptr),
        from_glib(flags),
        from_glib(paint_focus),
    )
}

unsafe extern "C" fn cell_area_create_context<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
) -> *mut ffi::GtkCellAreaContext {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    imp.create_context().into_glib_ptr()
}

unsafe extern "C" fn cell_area_copy_context<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
) -> *mut ffi::GtkCellAreaContext {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);

    imp.copy_context(&*context).into_glib_ptr()
}

unsafe extern "C" fn cell_area_event<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    widgetptr: *mut ffi::GtkWidget,
    eventptr: *mut gdk::ffi::GdkEvent,
    rectangleptr: *const gdk::ffi::GdkRectangle,
    flags: ffi::GtkCellRendererState,
) -> glib::ffi::gboolean {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(widgetptr);
    let event: Borrowed<gdk::Event> = from_glib_borrow(eventptr);
    let rectangle: Borrowed<gdk::Rectangle> = from_glib_borrow(rectangleptr);

    imp.event(&*context, &*widget, &event, &rectangle, from_glib(flags))
        .into_glib()
}

unsafe extern "C" fn cell_area_foreach<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    callback: ffi::GtkCellCallback,
    user_data: glib::ffi::gpointer,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    let callback = CellCallback {
        callback,
        user_data,
    };

    imp.foreach(&callback)
}

unsafe extern "C" fn cell_area_foreach_alloc<T: CellAreaImpl>(
    ptr: *mut ffi::GtkCellArea,
    contextptr: *mut ffi::GtkCellAreaContext,
    widgetptr: *mut ffi::GtkWidget,
    areaptr: *const gdk::ffi::GdkRectangle,
    rectangleptr: *const gdk::ffi::GdkRectangle,
    callback: ffi::GtkCellAllocCallback,
    user_data: glib::ffi::gpointer,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();
    let context: Borrowed<CellAreaContext> = from_glib_borrow(contextptr);
    let widget: Borrowed<Widget> = from_glib_borrow(widgetptr);
    let rectangle: Borrowed<gdk::Rectangle> = from_glib_borrow(rectangleptr);
    let area: Borrowed<gdk::Rectangle> = from_glib_borrow(areaptr);

    let callback = CellCallbackAllocate {
        callback,
        user_data,
    };

    imp.foreach_alloc(&*context, &*widget, &area, &rectangle, &callback)
}

#[allow(clippy::missing_safety_doc)]
pub unsafe trait CellAreaClassExt: ClassStruct {
    /// Finds a cell property of a cell area class by name.
    ///
    /// # Deprecated since 4.10
    ///
    /// ## `property_name`
    /// the name of the child property to find
    ///
    /// # Returns
    ///
    /// the `GParamSpec` of the child property
    #[doc(alias = "gtk_cell_area_class_find_cell_property")]
    fn find_cell_property(&self, property_name: &str) -> Option<ParamSpec> {
        unsafe {
            let cell_area_class = self as *const _ as *mut ffi::GtkCellAreaClass;
            from_glib_none(ffi::gtk_cell_area_class_find_cell_property(
                cell_area_class,
                property_name.to_glib_none().0,
            ))
        }
    }

    /// Returns all cell properties of a cell area class.
    ///
    /// # Deprecated since 4.10
    ///
    ///
    /// # Returns
    ///
    /// a newly
    ///     allocated [`None`]-terminated array of `GParamSpec`*.  The array
    ///     must be freed with g_free().
    #[doc(alias = "gtk_cell_area_class_list_cell_properties")]
    fn list_cell_properties(&self) -> Vec<ParamSpec> {
        unsafe {
            let cell_area_class = self as *const _ as *mut ffi::GtkCellAreaClass;
            let mut n_properties = std::mem::MaybeUninit::uninit();
            let props = ffi::gtk_cell_area_class_list_cell_properties(
                cell_area_class,
                n_properties.as_mut_ptr(),
            );
            FromGlibContainer::from_glib_none_num(props, n_properties.assume_init() as usize)
        }
    }
}

unsafe impl<T: ClassStruct> CellAreaClassExt for T where T::Type: CellAreaImpl {}