Struct sixtyfps_corelib::component::ComponentVTable

#[repr(C)]
pub struct ComponentVTable {
    pub visit_children_item: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: isize, order: TraversalOrder, visitor: VRefMut<'_, ItemVisitorVTable>) -> VisitChildrenResult,
    pub get_item_ref: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: usize) -> Pin<VRef<'_, ItemVTable>>,
    pub parent_item: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: usize, result: &mut ItemWeak),
    pub layout_info: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, _: Orientation) -> LayoutInfo,
    pub drop_in_place: unsafe extern "C" fn(_: VRefMut<'_, ComponentVTable>) -> Layout,
    pub dealloc: unsafe extern "C" fn(_: &ComponentVTable, ptr: *mut u8, layout: Layout),
}

A Component is representing an unit that is allocated together

Fields

visit_children_item: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: isize, order: TraversalOrder, visitor: VRefMut<'_, ItemVisitorVTable>) -> VisitChildrenResult

Visit the children of the item at index index. Note that the root item is at index 0, so passing 0 would visit the item under root (the children of root). If you want to visit the root item, you need to pass -1 as an index.

get_item_ref: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: usize) -> Pin<VRef<'_, ItemVTable>>

Return a reference to an item using the given index

parent_item: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, index: usize, result: &mut ItemWeak)

Return the parent item. The return value is an item weak because it can be null if there is no parent. And the return value is passed by &mut because ItemWeak has a destructor

layout_info: unsafe extern "C" fn(_: Pin<VRef<'_, ComponentVTable>>, _: Orientation) -> LayoutInfo

Returns the layout info for this component

drop_in_place: unsafe extern "C" fn(_: VRefMut<'_, ComponentVTable>) -> Layout

in-place destructor (for VRc)

dealloc: unsafe extern "C" fn(_: &ComponentVTable, ptr: *mut u8, layout: Layout)

dealloc function (for VRc)

Implementations

impl ComponentVTable

pub fn new<T: Component>() -> Self

Create a vtable suitable for a given type implementing the trait.

Trait Implementations

impl VTableMeta for ComponentVTable

type VTable = ComponentVTable

That’s the VTable itself (so most likely Self)

type Target = ComponentTO

That’s the trait object that implements the functions

impl VTableMetaDropInPlace for ComponentVTable

unsafe fn drop_in_place(vtable: &Self::VTable, ptr: *mut u8) -> Layout

Safety

unsafe fn dealloc(vtable: &Self::VTable, ptr: *mut u8, layout: Layout)

Safety