gtk4/subclass/

cell_area_context.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 [`CellAreaContext`](crate::CellAreaContext).

use std::mem::MaybeUninit;

use glib::translate::*;

use crate::{ffi, prelude::*, subclass::prelude::*, CellAreaContext};

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait CellAreaContextImpl: CellAreaContextImplExt + ObjectImpl {
    /// Resets any previously cached request and allocation
    /// data.
    ///
    /// When underlying [`TreeModel`][crate::TreeModel] data changes its
    /// important to reset the context if the content
    /// size is allowed to shrink. If the content size
    /// is only allowed to grow (this is usually an option
    /// for views rendering large data stores as a measure
    /// of optimization), then only the row that changed
    /// or was inserted needs to be (re)requested with
    /// gtk_cell_area_get_preferred_width().
    ///
    /// When the new overall size of the context requires
    /// that the allocated size changes (or whenever this
    /// allocation changes at all), the variable row
    /// sizes need to be re-requested for every row.
    ///
    /// For instance, if the rows are displayed all with
    /// the same width from top to bottom then a change
    /// in the allocated width necessitates a recalculation
    /// of all the displayed row heights using
    /// gtk_cell_area_get_preferred_height_for_width().
    ///
    /// # Deprecated since 4.10
    ///
    /// This object will be removed in GTK 5
    fn reset(&self) {
        self.parent_reset()
    }

    /// Gets the accumulative preferred height for @width for all rows
    /// which have been requested for the same said @width with this context.
    ///
    /// After gtk_cell_area_context_reset() is called and/or before ever
    /// requesting the size of a [`CellArea`][crate::CellArea], the returned values are -1.
    ///
    /// # Deprecated since 4.10
    ///
    /// This object will be removed in GTK 5
    /// ## `width`
    /// a proposed width for allocation
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_height`
    /// location to store the minimum height
    ///
    /// ## `natural_height`
    /// location to store the natural height
    fn preferred_height_for_width(&self, width: i32) -> (i32, i32) {
        self.parent_preferred_height_for_width(width)
    }

    /// Gets the accumulative preferred width for @height for all rows which
    /// have been requested for the same said @height with this context.
    ///
    /// After gtk_cell_area_context_reset() is called and/or before ever
    /// requesting the size of a [`CellArea`][crate::CellArea], the returned values are -1.
    ///
    /// # Deprecated since 4.10
    ///
    /// This object will be removed in GTK 5
    /// ## `height`
    /// a proposed height for allocation
    ///
    /// # Returns
    ///
    ///
    /// ## `minimum_width`
    /// location to store the minimum width
    ///
    /// ## `natural_width`
    /// location to store the natural width
    fn preferred_width_for_height(&self, height: i32) -> (i32, i32) {
        self.parent_preferred_width_for_height(height)
    }

    /// Allocates a width and/or a height for all rows which are to be
    /// rendered with @self.
    ///
    /// Usually allocation is performed only horizontally or sometimes
    /// vertically since a group of rows are usually rendered side by
    /// side vertically or horizontally and share either the same width
    /// or the same height. Sometimes they are allocated in both horizontal
    /// and vertical orientations producing a homogeneous effect of the
    /// rows. This is generally the case for [`TreeView`][crate::TreeView] when
    /// `GtkTreeView:fixed-height-mode` is enabled.
    ///
    /// # Deprecated since 4.10
    ///
    /// This object will be removed in GTK 5
    /// ## `width`
    /// the allocated width for all [`TreeModel`][crate::TreeModel] rows rendered
    ///   with @self, or -1
    /// ## `height`
    /// the allocated height for all [`TreeModel`][crate::TreeModel] rows rendered
    ///   with @self, or -1
    fn allocate(&self, width: i32, height: i32) {
        self.parent_allocate(width, height)
    }
}

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

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait CellAreaContextImplExt: sealed::Sealed + ObjectSubclass {
    fn parent_reset(&self) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaContextClass;
            if let Some(f) = (*parent_class).reset {
                f(self
                    .obj()
                    .unsafe_cast_ref::<CellAreaContext>()
                    .to_glib_none()
                    .0)
            }
        }
    }

    fn parent_preferred_height_for_width(&self, width: i32) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaContextClass;
            if let Some(f) = (*parent_class).get_preferred_height_for_width {
                let mut minimum_size = MaybeUninit::uninit();
                let mut natural_size = MaybeUninit::uninit();
                f(
                    self.obj()
                        .unsafe_cast_ref::<CellAreaContext>()
                        .to_glib_none()
                        .0,
                    width,
                    minimum_size.as_mut_ptr(),
                    natural_size.as_mut_ptr(),
                );
                (minimum_size.assume_init(), natural_size.assume_init())
            } else {
                (-1, -1)
            }
        }
    }

    fn parent_preferred_width_for_height(&self, height: i32) -> (i32, i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaContextClass;
            if let Some(f) = (*parent_class).get_preferred_width_for_height {
                let mut minimum_size = MaybeUninit::uninit();
                let mut natural_size = MaybeUninit::uninit();
                f(
                    self.obj()
                        .unsafe_cast_ref::<CellAreaContext>()
                        .to_glib_none()
                        .0,
                    height,
                    minimum_size.as_mut_ptr(),
                    natural_size.as_mut_ptr(),
                );
                (minimum_size.assume_init(), natural_size.assume_init())
            } else {
                (-1, -1)
            }
        }
    }

    fn parent_allocate(&self, width: i32, height: i32) {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkCellAreaContextClass;
            if let Some(f) = (*parent_class).allocate {
                f(
                    self.obj()
                        .unsafe_cast_ref::<CellAreaContext>()
                        .to_glib_none()
                        .0,
                    width,
                    height,
                )
            }
        }
    }
}

impl<T: CellAreaContextImpl> CellAreaContextImplExt for T {}

unsafe impl<T: CellAreaContextImpl> IsSubclassable<T> for CellAreaContext {
    fn class_init(class: &mut glib::Class<Self>) {
        Self::parent_class_init::<T>(class);

        assert_initialized_main_thread!();

        let klass = class.as_mut();
        klass.reset = Some(cell_area_context_reset::<T>);
        klass.get_preferred_height_for_width =
            Some(cell_area_context_get_preferred_height_for_width::<T>);
        klass.get_preferred_width_for_height =
            Some(cell_area_context_get_preferred_width_for_height::<T>);
        klass.allocate = Some(cell_area_context_allocate::<T>);
    }
}

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

    imp.reset()
}

unsafe extern "C" fn cell_area_context_get_preferred_height_for_width<T: CellAreaContextImpl>(
    ptr: *mut ffi::GtkCellAreaContext,
    width: i32,
    minimum_height: *mut libc::c_int,
    natural_height: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    let (min_height, nat_height) = imp.preferred_height_for_width(width);
    *minimum_height = min_height;
    *natural_height = nat_height;
}

unsafe extern "C" fn cell_area_context_get_preferred_width_for_height<T: CellAreaContextImpl>(
    ptr: *mut ffi::GtkCellAreaContext,
    height: i32,
    minimum_width: *mut libc::c_int,
    natural_width: *mut libc::c_int,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    let (min_width, nat_width) = imp.preferred_width_for_height(height);
    *minimum_width = min_width;
    *natural_width = nat_width;
}

unsafe extern "C" fn cell_area_context_allocate<T: CellAreaContextImpl>(
    ptr: *mut ffi::GtkCellAreaContext,
    width: i32,
    height: i32,
) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.imp();

    imp.allocate(width, height)
}