i_slint_core/

items.rs

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

// cSpell: ignore nesw windowitem

/*!
This module contains the builtin items, either in this file or in sub-modules.

When adding an item or a property, it needs to be kept in sync with different place.
(This is less than ideal and maybe we can have some automation later)

 - It needs to be changed in this module
 - In the compiler: internal/compiler/builtin_elements.rs
 - In the interpreter (new item only): item_registry.rs
 - For the C++ code (new item only): the cbindgen.rs to export the new item
 - Don't forget to update the documentation
*/

#![allow(unsafe_code)]
#![allow(non_upper_case_globals)]
#![allow(missing_docs)] // because documenting each property of items is redundant

use crate::api::LogicalPosition;
use crate::cursor::MouseCursorInner;
use crate::data_transfer::DataTransfer;
use crate::graphics::{Brush, Color, FontRequest, Image};
use crate::input::{
    FocusEvent, FocusEventResult, InputEventFilterResult, InputEventResult, InternalKeyEvent,
    KeyEventResult, KeyEventType, Keys, MouseEvent,
};
use crate::item_rendering::{CachedRenderingData, RenderBorderRectangle, RenderRectangle};
use crate::item_tree::ItemTreeRc;
pub use crate::item_tree::{ItemRc, ItemTreeVTable};
use crate::layout::LayoutInfo;
use crate::lengths::{
    LogicalBorderRadius, LogicalLength, LogicalRect, LogicalSize, LogicalVector, PointLengths,
    RectLengths,
};
pub use crate::menus::MenuItem;
#[cfg(feature = "rtti")]
use crate::rtti::*;
use crate::window::{WindowAdapter, WindowAdapterRc, WindowInner};
use crate::{Callback, Coord, Property, SharedString};
use alloc::rc::Rc;
use const_field_offset::FieldOffsets;
use core::cell::Cell;
use core::num::NonZeroU32;
use core::pin::Pin;
use core::time::Duration;
use i_slint_core_macros::*;
pub use system_tray::SystemTrayIcon;
use vtable::*;

mod component_container;
pub use self::component_container::*;
mod flickable;
pub use flickable::Flickable;
mod text;
pub use text::*;
mod input_items;
pub use input_items::*;
mod image;
pub use self::image::*;
mod drag_n_drop;
pub use drag_n_drop::*;
#[cfg(feature = "path")]
mod path;
#[cfg(feature = "path")]
pub use path::*;
pub mod system_tray;

/// Alias for `&mut dyn ItemRenderer`. Required so cbindgen generates the ItemVTable
/// despite the presence of trait object
type ItemRendererRef<'a> = &'a mut dyn crate::item_rendering::ItemRenderer;

/// Workarounds for cbindgen
pub type VoidArg = ();
pub type KeyEventArg = (KeyEvent,);
pub type DragActionArg = (DragAction,);
type FocusReasonArg = (FocusReason,);
type PointerEventArg = (PointerEvent,);
type PointerScrollEventArg = (PointerScrollEvent,);
type PointArg = (LogicalPosition,);
type MenuEntryArg = (MenuEntry,);
type StringArg = (SharedString,);
type MenuEntryModel = crate::model::ModelRc<MenuEntry>;

#[cfg(all(feature = "ffi", windows))]
#[macro_export]
macro_rules! declare_item_vtable {
    (fn $getter:ident() -> $item_vtable_ty:ident for $item_ty:ty) => {
        ItemVTable_static! {
            #[unsafe(no_mangle)]
            pub static $item_vtable_ty for $item_ty
        }
        #[unsafe(no_mangle)]
        pub extern "C" fn $getter() -> *const ItemVTable {
            use vtable::HasStaticVTable;
            <$item_ty>::STATIC_VTABLE
        }
    };
}
#[cfg(not(all(feature = "ffi", windows)))]
#[macro_export]
macro_rules! declare_item_vtable {
    (fn $getter:ident() -> $item_vtable_ty:ident for $item_ty:ty) => {
        ItemVTable_static! {
            #[unsafe(no_mangle)]
            pub static $item_vtable_ty for $item_ty
        }
    };
}

/// Returned by the `render()` function on items to indicate whether the rendering of
/// children should be handled by the caller, of if the item took care of that (for example
/// through layer indirection)
#[repr(C)]
#[derive(Default)]
pub enum RenderingResult {
    #[default]
    ContinueRenderingChildren,
    ContinueRenderingWithoutChildren,
}

/// Items are the nodes in the render tree.
#[cfg_attr(not(feature = "ffi"), i_slint_core_macros::remove_extern)]
#[vtable]
#[repr(C)]
pub struct ItemVTable {
    /// This function is called by the run-time after the memory for the item
    /// has been allocated and initialized. It will be called before any user specified
    /// bindings are set.
    pub init: extern "C" fn(core::pin::Pin<VRef<ItemVTable>>, my_item: &ItemRc),

    pub deinit: extern "C" fn(core::pin::Pin<VRef<ItemVTable>>, window_adapter: &WindowAdapterRc),

    /// offset in bytes from the *const ItemImpl.
    /// usize::MAX  means None
    #[allow(non_upper_case_globals)]
    #[field_offset(CachedRenderingData)]
    pub cached_rendering_data_offset: usize,

    /// We would need max/min/preferred size, and all layout info.
    /// `cross_axis_constraint` is the available width when querying vertical
    /// layout info, enabling height-for-width (Text word-wrap, Image aspect
    /// ratio). Negative values mean unconstrained.
    pub layout_info: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        orientation: Orientation,
        cross_axis_constraint: Coord,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
    ) -> LayoutInfo,

    /// Event handler for mouse and touch event. This function is called before being called on children.
    /// Then, depending on the return value, it is called for the children, and their children, then
    /// [`Self::input_event`] is called on the children, and finally [`Self::input_event`] is called
    /// on this item again.
    ///
    /// The `cursor` argument needs to be changed by either this function ot the `input_event` function
    /// if this item wants to change the cursor.
    /// The value of `cursor` is always reset to `MouseCursor::Default` before dispatching the event,
    /// so any call to this function need to set the cursor
    pub input_event_filter_before_children: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        &MouseEvent,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
        cursor: &mut MouseCursorInner,
    ) -> InputEventFilterResult,

    /// Handle input event for mouse and touch event
    pub input_event: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        &MouseEvent,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
        cursor: &mut MouseCursorInner,
    ) -> InputEventResult,

    pub focus_event: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        &FocusEvent,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
    ) -> FocusEventResult,

    /// Called on the parents of the focused item, allowing for global shortcuts and similar
    /// overrides of the default actions.
    pub capture_key_event: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        &InternalKeyEvent,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
    ) -> KeyEventResult,

    pub key_event: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        &InternalKeyEvent,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
    ) -> KeyEventResult,

    pub render: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult,

    /// Returns the rendering bounding rect for that particular item in the parent's item coordinate
    /// (same coordinate system as the geometry)
    pub bounding_rect: extern "C" fn(
        core::pin::Pin<VRef<ItemVTable>>,
        window_adapter: &WindowAdapterRc,
        self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect,

    pub clips_children: extern "C" fn(core::pin::Pin<VRef<ItemVTable>>) -> bool,
}

/// Alias for `vtable::VRef<ItemVTable>` which represent a pointer to a `dyn Item` with
/// the associated vtable
pub type ItemRef<'a> = vtable::VRef<'a, ItemVTable>;

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of an empty items that does nothing
pub struct Empty {
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Empty {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        _backend: &mut ItemRendererRef,
        _self_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        mut geometry: LogicalRect,
    ) -> LogicalRect {
        geometry.size = LogicalSize::zero();
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl ItemConsts for Empty {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        Empty,
        CachedRenderingData,
    > = Empty::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_EmptyVTable() -> EmptyVTable for Empty
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of the `Rectangle` element
pub struct Rectangle {
    pub background: Property<Brush>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Rectangle {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        (*backend).draw_rectangle(self, self_rc, size, &self.cached_rendering_data);
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl RenderRectangle for Rectangle {
    fn background(self: Pin<&Self>) -> Brush {
        self.background()
    }
}

impl ItemConsts for Rectangle {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        Rectangle,
        CachedRenderingData,
    > = Rectangle::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_RectangleVTable() -> RectangleVTable for Rectangle
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of the `BasicBorderRectangle` element
pub struct BasicBorderRectangle {
    pub background: Property<Brush>,
    pub border_width: Property<LogicalLength>,
    pub border_radius: Property<LogicalLength>,
    pub border_color: Property<Brush>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for BasicBorderRectangle {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        (*backend).draw_border_rectangle(self, self_rc, size, &self.cached_rendering_data);
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl RenderBorderRectangle for BasicBorderRectangle {
    fn background(self: Pin<&Self>) -> Brush {
        self.background()
    }
    fn border_width(self: Pin<&Self>) -> LogicalLength {
        self.border_width()
    }
    fn border_radius(self: Pin<&Self>) -> LogicalBorderRadius {
        LogicalBorderRadius::from_length(self.border_radius())
    }
    fn border_color(self: Pin<&Self>) -> Brush {
        self.border_color()
    }
}

impl ItemConsts for BasicBorderRectangle {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        BasicBorderRectangle,
        CachedRenderingData,
    > = BasicBorderRectangle::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_BasicBorderRectangleVTable() -> BasicBorderRectangleVTable for BasicBorderRectangle
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of the `BorderRectangle` element
pub struct BorderRectangle {
    pub background: Property<Brush>,
    pub border_width: Property<LogicalLength>,
    pub border_radius: Property<LogicalLength>,
    pub border_top_left_radius: Property<LogicalLength>,
    pub border_top_right_radius: Property<LogicalLength>,
    pub border_bottom_left_radius: Property<LogicalLength>,
    pub border_bottom_right_radius: Property<LogicalLength>,
    pub border_color: Property<Brush>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for BorderRectangle {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        (*backend).draw_border_rectangle(self, self_rc, size, &self.cached_rendering_data);
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl RenderBorderRectangle for BorderRectangle {
    fn background(self: Pin<&Self>) -> Brush {
        self.background()
    }
    fn border_width(self: Pin<&Self>) -> LogicalLength {
        self.border_width()
    }
    fn border_radius(self: Pin<&Self>) -> LogicalBorderRadius {
        LogicalBorderRadius::from_lengths(
            self.border_top_left_radius(),
            self.border_top_right_radius(),
            self.border_bottom_right_radius(),
            self.border_bottom_left_radius(),
        )
    }
    fn border_color(self: Pin<&Self>) -> Brush {
        self.border_color()
    }
}

impl ItemConsts for BorderRectangle {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        BorderRectangle,
        CachedRenderingData,
    > = BorderRectangle::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_BorderRectangleVTable() -> BorderRectangleVTable for BorderRectangle
}

declare_item_vtable! {
    fn slint_get_TouchAreaVTable() -> TouchAreaVTable for TouchArea
}

declare_item_vtable! {
    fn slint_get_FocusScopeVTable() -> FocusScopeVTable for FocusScope
}

crate::declare_item_vtable! {
    fn slint_get_KeyBindingVTable() -> KeyBindingVTable for KeyBinding
}

declare_item_vtable! {
    fn slint_get_SwipeGestureHandlerVTable() -> SwipeGestureHandlerVTable for SwipeGestureHandler
}

declare_item_vtable! {
    fn slint_get_ScaleRotateGestureHandlerVTable() -> ScaleRotateGestureHandlerVTable for ScaleRotateGestureHandler
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of the `Clip` element
pub struct Clip {
    pub border_top_left_radius: Property<LogicalLength>,
    pub border_top_right_radius: Property<LogicalLength>,
    pub border_bottom_left_radius: Property<LogicalLength>,
    pub border_bottom_right_radius: Property<LogicalLength>,
    pub border_width: Property<LogicalLength>,
    pub cached_rendering_data: CachedRenderingData,
    pub clip: Property<bool>,
    pub is_visibility_clip: Property<bool>,
}

impl Item for Clip {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        event: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        if let Some(pos) = event.position() {
            let geometry = self_rc.geometry();
            if self.clip()
                && (pos.x < 0 as Coord
                    || pos.y < 0 as Coord
                    || pos.x_length() > geometry.width_length()
                    || pos.y_length() > geometry.height_length())
            {
                return InputEventFilterResult::Intercept;
            }
        }
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        (*backend).visit_clip(self, self_rc, size)
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        self.clip()
    }
}

impl Clip {
    pub fn logical_border_radius(self: Pin<&Self>) -> LogicalBorderRadius {
        LogicalBorderRadius::from_lengths(
            self.border_top_left_radius(),
            self.border_top_right_radius(),
            self.border_bottom_right_radius(),
            self.border_bottom_left_radius(),
        )
    }
}

impl ItemConsts for Clip {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<Clip, CachedRenderingData> =
        Clip::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_ClipVTable() -> ClipVTable for Clip
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The Opacity Item is not meant to be used directly by the .slint code, instead, the `opacity: xxx` or `visible: false` should be used
pub struct Opacity {
    // FIXME: this element shouldn't need these geometry property
    pub opacity: Property<f32>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Opacity {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        backend.visit_opacity(self, self_rc, size)
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl Opacity {
    // This function determines the optimization opportunities for not having to render the
    // children of the Opacity element into a layer:
    //  *  The opacity item typically only one child (this is not guaranteed). If that item has
    //     no children, then we can skip the layer and apply the opacity directly. This is not perfect though,
    //     for example if the compiler inserts another synthetic element between the `Opacity` and the actual child,
    //     then this check will apply a layer even though it might not actually be necessary.
    //  * If the vale of the opacity is 1.0 then we don't need to do anything.
    pub fn need_layer(self_rc: &ItemRc, opacity: f32) -> bool {
        if opacity == 1.0 {
            return false;
        }

        let opacity_child = match self_rc.first_child() {
            Some(first_child) => first_child,
            None => return false, // No children? Don't need a layer then.
        };

        if opacity_child.next_sibling().is_some() {
            return true; // If the opacity item has more than one child, then we need a layer
        }

        // If the target of the opacity has any children then we need a layer
        opacity_child.first_child().is_some()
    }
}

impl ItemConsts for Opacity {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        Opacity,
        CachedRenderingData,
    > = Opacity::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_OpacityVTable() -> OpacityVTable for Opacity
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The Layer Item is not meant to be used directly by the .slint code, instead, the `layer: xxx` property should be used
pub struct Layer {
    pub cache_rendering_hint: Property<bool>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Layer {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        backend.visit_layer(self, self_rc, size)
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl ItemConsts for Layer {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        Layer,
        CachedRenderingData,
    > = Layer::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_LayerVTable() -> LayerVTable for Layer
}

#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
/// The implementation of the `Transform` item.
/// This item is generated by the compiler  as soon as any transform property is used on any element.
pub struct Transform {
    pub transform_rotation: Property<f32>,
    pub transform_scale_x: Property<f32>,
    pub transform_scale_y: Property<f32>,
    pub transform_origin: Property<LogicalPosition>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for Transform {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        _self_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        let origin = self.transform_origin().to_euclid().to_vector();
        (*backend).translate(origin);
        (*backend).scale(self.transform_scale_x(), self.transform_scale_y());
        (*backend).rotate(self.transform_rotation());
        (*backend).translate(-origin);
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl ItemConsts for Transform {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        Transform,
        CachedRenderingData,
    > = Transform::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_TransformVTable() -> TransformVTable for Transform
}

declare_item_vtable! {
    fn slint_get_FlickableVTable() -> FlickableVTable for Flickable
}

declare_item_vtable! {
    fn slint_get_DragAreaVTable() -> DragAreaVTable for DragArea
}

declare_item_vtable! {
    fn slint_get_DropAreaVTable() -> DropAreaVTable for DropArea
}

declare_item_vtable! {
    fn slint_get_WindowMoveAreaVTable() -> WindowMoveAreaVTable for WindowMoveArea
}

/// The implementation of the `PropertyAnimation` element
/// This animation has the time as animation limit
#[repr(C)]
#[derive(FieldOffsets, SlintElement, Clone, Debug)]
#[pin]
pub struct PropertyAnimation {
    #[rtti_field]
    pub delay: i32,
    /// duration in millisecond
    #[rtti_field]
    pub duration: i32,
    #[rtti_field]
    pub iteration_count: f32,
    #[rtti_field]
    pub direction: AnimationDirection,
    #[rtti_field]
    pub easing: crate::animations::EasingCurve,
    #[rtti_field]
    pub enabled: bool,
}

impl Default for PropertyAnimation {
    fn default() -> Self {
        // Defaults for PropertyAnimation are defined here (for internal Rust code doing programmatic animations)
        // as well as in `internal/compiler/builtin_elements.rs` (for generated C++ and Rust code)
        Self {
            delay: 0,
            duration: 0,
            iteration_count: 1.,
            direction: Default::default(),
            easing: Default::default(),
            enabled: true,
        }
    }
}

/// The implementation of the `Window` element
#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
pub struct WindowItem {
    pub width: Property<LogicalLength>,
    pub height: Property<LogicalLength>,
    pub safe_area_insets: Property<crate::lengths::LogicalEdges>,
    pub virtual_keyboard_position: Property<crate::lengths::LogicalPoint>,
    pub virtual_keyboard_size: Property<crate::lengths::LogicalSize>,
    pub background: Property<Brush>,
    pub title: Property<SharedString>,
    pub no_frame: Property<bool>,
    pub resize_border_width: Property<LogicalLength>,
    pub always_on_top: Property<bool>,
    pub full_screen: Property<bool>,
    pub minimized: Property<bool>,
    pub maximized: Property<bool>,
    pub icon: Property<crate::graphics::Image>,
    pub default_font_family: Property<SharedString>,
    pub default_font_size: Property<LogicalLength>,
    pub default_font_weight: Property<i32>,
    pub cached_rendering_data: CachedRenderingData,
}

impl Item for WindowItem {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {
        #[cfg(feature = "std")]
        self.full_screen.set(std::env::var("SLINT_FULLSCREEN").is_ok());
    }

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo::default()
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        if self_rc.parent_item(crate::item_tree::ParentItemTraversalMode::StopAtPopups).is_none() {
            backend.draw_window_background(self, self_rc, size, &self.cached_rendering_data);
        } else {
            // Dialogs and other nested Window items
            backend.draw_rectangle(self, self_rc, size, &self.cached_rendering_data);
        }
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl RenderRectangle for WindowItem {
    fn background(self: Pin<&Self>) -> Brush {
        self.background()
    }
}

fn next_window_item(item: &ItemRc) -> Option<ItemRc> {
    let root_item_in_local_item_tree = ItemRc::new_root(item.item_tree().clone());

    if root_item_in_local_item_tree.downcast::<crate::items::WindowItem>().is_some() {
        Some(root_item_in_local_item_tree)
    } else {
        root_item_in_local_item_tree
            .parent_item(crate::item_tree::ParentItemTraversalMode::FindAllParents)
            .and_then(|parent| next_window_item(&parent))
    }
}

impl WindowItem {
    pub fn font_family(self: Pin<&Self>) -> Option<SharedString> {
        let maybe_family = self.default_font_family();
        if !maybe_family.is_empty() { Some(maybe_family) } else { None }
    }

    pub fn font_size(self: Pin<&Self>) -> Option<LogicalLength> {
        let font_size = self.default_font_size();
        if font_size.get() <= 0 as Coord { None } else { Some(font_size) }
    }

    pub fn font_weight(self: Pin<&Self>) -> Option<i32> {
        let font_weight = self.default_font_weight();
        if font_weight == 0 { None } else { Some(font_weight) }
    }

    pub fn resolved_default_font_size(item_tree: ItemTreeRc) -> LogicalLength {
        let first_item = ItemRc::new_root(item_tree);
        let window_item = next_window_item(&first_item).unwrap();
        Self::resolve_font_property(&window_item, Self::font_size)
            .or_else(|| Self::platform_default_font_size(&first_item))
            .unwrap_or(crate::textlayout::DEFAULT_FONT_SIZE)
    }

    /// Returns the default font size reported by the platform (e.g. iOS Dynamic Type),
    /// or `None` when the backend doesn't report one. Used as fallback when no
    /// `default-font-size` is set in the .slint code, before the renderer's built-in
    /// default applies.
    fn platform_default_font_size(item: &ItemRc) -> Option<LogicalLength> {
        item.window_adapter().and_then(|adapter| {
            WindowInner::from_pub(adapter.window()).context().platform_default_font_size()
        })
    }

    fn resolve_font_property<T>(
        self_rc: &ItemRc,
        property_fn: impl Fn(Pin<&Self>) -> Option<T>,
    ) -> Option<T> {
        let mut window_item_rc = self_rc.clone();
        loop {
            let window_item = window_item_rc.downcast::<Self>()?;
            if let Some(result) = property_fn(window_item.as_pin_ref()) {
                return Some(result);
            }

            window_item_rc = window_item_rc
                .parent_item(crate::item_tree::ParentItemTraversalMode::FindAllParents)
                .and_then(|p| next_window_item(&p))?;
        }
    }

    /// Creates a new FontRequest that uses the provide local font properties. If they're not set, i.e.
    /// the family is an empty string, or the weight is zero, the corresponding properties are fetched
    /// from the next parent WindowItem.
    pub fn resolved_font_request(
        self_rc: &crate::items::ItemRc,
        local_font_family: SharedString,
        local_font_weight: i32,
        local_font_size: LogicalLength,
        local_letter_spacing: LogicalLength,
        local_line_height_factor: f32,
        local_italic: bool,
    ) -> FontRequest {
        let Some(window_item_rc) = next_window_item(self_rc) else {
            return FontRequest::default();
        };

        FontRequest {
            family: {
                if !local_font_family.is_empty() {
                    Some(local_font_family)
                } else {
                    Self::resolve_font_property(
                        &window_item_rc,
                        crate::items::WindowItem::font_family,
                    )
                }
            },
            weight: {
                if local_font_weight == 0 {
                    Self::resolve_font_property(
                        &window_item_rc,
                        crate::items::WindowItem::font_weight,
                    )
                } else {
                    Some(local_font_weight)
                }
            },
            pixel_size: {
                if local_font_size.get() == 0 as Coord {
                    Self::resolve_font_property(
                        &window_item_rc,
                        crate::items::WindowItem::font_size,
                    )
                    .or_else(|| Self::platform_default_font_size(self_rc))
                } else {
                    Some(local_font_size)
                }
            },
            letter_spacing: Some(local_letter_spacing),
            // 1 is neutral and negative or non-finite values behave like 1, all mapping to
            // None (the font's natural line height); 0 is a valid factor and collapses lines.
            line_height_factor: (local_line_height_factor.is_finite()
                && local_line_height_factor >= 0.0
                && local_line_height_factor != 1.0)
                .then_some(local_line_height_factor),
            italic: local_italic,
        }
    }

    pub fn close(
        self: Pin<&Self>,
        window_adapter: &Rc<dyn WindowAdapter>,
        self_rc: &ItemRc,
    ) -> bool {
        if !is_root_window_item(window_adapter, self_rc) {
            return false;
        }
        let inner = WindowInner::from_pub(window_adapter.window());
        let accepted = inner.request_close();
        if accepted && let Err(err) = inner.hide() {
            crate::debug_log!("Slint: Failed to hide window after close request: {err}");
        }
        accepted
    }

    pub fn hide(self: Pin<&Self>, window_adapter: &Rc<dyn WindowAdapter>, self_rc: &ItemRc) {
        if !is_root_window_item(window_adapter, self_rc) {
            return;
        }
        let _ = WindowInner::from_pub(window_adapter.window()).hide();
    }
}

/// A `WindowItem` is considered the adapter's root window only when it is at index 0 of
/// the component item tree currently bound to the adapter.
fn is_root_window_item(window_adapter: &Rc<dyn WindowAdapter>, self_rc: &ItemRc) -> bool {
    if !self_rc.is_root() {
        return false;
    }

    WindowInner::from_pub(window_adapter.window())
        .try_component()
        .is_some_and(|component| VRc::ptr_eq(&component, self_rc.item_tree()))
}

impl ItemConsts for WindowItem {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<Self, CachedRenderingData> =
        Self::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

#[cfg(feature = "ffi")]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_windowitem_close(
    window_item: Pin<&WindowItem>,
    window_adapter: *const crate::window::ffi::WindowAdapterRcOpaque,
    self_component: &vtable::VRc<crate::item_tree::ItemTreeVTable>,
    self_index: u32,
) -> bool {
    unsafe {
        let window_adapter = &*(window_adapter as *const Rc<dyn WindowAdapter>);
        let item_rc = ItemRc::new(self_component.clone(), self_index);
        window_item.close(window_adapter, &item_rc)
    }
}

#[cfg(feature = "ffi")]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_windowitem_hide(
    window_item: Pin<&WindowItem>,
    window_adapter: *const crate::window::ffi::WindowAdapterRcOpaque,
    self_component: &vtable::VRc<crate::item_tree::ItemTreeVTable>,
    self_index: u32,
) {
    unsafe {
        let window_adapter = &*(window_adapter as *const Rc<dyn WindowAdapter>);
        let item_rc = ItemRc::new(self_component.clone(), self_index);
        window_item.hide(window_adapter, &item_rc);
    }
}

declare_item_vtable! {
    fn slint_get_WindowItemVTable() -> WindowItemVTable for WindowItem
}

/// The implementation used for `ContextMenuArea` and `ContextMenuInternal` elements
#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
pub struct ContextMenu {
    //pub entries: Property<crate::model::ModelRc<MenuEntry>>,
    pub sub_menu: Callback<MenuEntryArg, MenuEntryModel>,
    pub activated: Callback<MenuEntryArg>,
    pub show: Callback<PointArg>,
    pub cached_rendering_data: CachedRenderingData,
    pub popup_id: Cell<Option<NonZeroU32>>,
    pub enabled: Property<bool>,
    #[cfg(target_os = "android")]
    long_press_timer: crate::timers::Timer,
}

impl Item for ContextMenu {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo::default()
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardEvent
    }

    fn input_event(
        self: Pin<&Self>,
        event: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        if !self.enabled() {
            return InputEventResult::EventIgnored;
        }
        match event {
            MouseEvent::Pressed { position, button: PointerEventButton::Right, .. } => {
                self.show.call(&(LogicalPosition::from_euclid(*position),));
                InputEventResult::EventAccepted
            }
            #[cfg(target_os = "android")]
            MouseEvent::Pressed { position, button: PointerEventButton::Left, .. } => {
                let self_weak = _self_rc.downgrade();
                let position = *position;
                let ctx = WindowInner::from_pub(_window_adapter.window()).context();
                self.long_press_timer.start_on(
                    ctx,
                    crate::timers::TimerMode::SingleShot,
                    ctx.platform().long_press_interval(crate::InternalToken),
                    move || {
                        let Some(self_rc) = self_weak.upgrade() else { return };
                        let Some(self_) = self_rc.downcast::<ContextMenu>() else { return };
                        self_.show.call(&(LogicalPosition::from_euclid(position),));
                    },
                );
                InputEventResult::GrabMouse
            }
            #[cfg(target_os = "android")]
            MouseEvent::Released { .. } | MouseEvent::Exit => {
                self.long_press_timer.stop();
                InputEventResult::EventIgnored
            }
            #[cfg(target_os = "android")]
            MouseEvent::Moved { .. } => InputEventResult::EventAccepted,
            _ => InputEventResult::EventIgnored,
        }
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        event: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        if !self.enabled() {
            return KeyEventResult::EventIgnored;
        }

        fn is_menu_key(event: &InternalKeyEvent) -> bool {
            #[allow(unused_mut)]
            let mut is_menu_key = event.key_event.text.contains(crate::input::key_codes::Menu);
            #[cfg(target_os = "windows")]
            {
                // Windows maps Shift + F10 to open the context menu
                is_menu_key |= event.key_event.text.contains(crate::input::key_codes::F10)
                    && event.key_event.modifiers.shift;
            }
            is_menu_key
        }

        if is_menu_key(event) {
            self.show.call(&(Default::default(),));
            KeyEventResult::EventAccepted
        } else {
            KeyEventResult::EventIgnored
        }
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        _backend: &mut ItemRendererRef,
        _self_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl ContextMenu {
    pub fn close(self: Pin<&Self>, window_adapter: &Rc<dyn WindowAdapter>, _: &ItemRc) {
        if let Some(id) = self.popup_id.take() {
            WindowInner::from_pub(window_adapter.window()).close_popup(id);
        }
    }

    pub fn is_open(self: Pin<&Self>, window_adapter: &Rc<dyn WindowAdapter>, _: &ItemRc) -> bool {
        self.popup_id.get().is_some_and(|id| {
            WindowInner::from_pub(window_adapter.window())
                .active_popups()
                .iter()
                .any(|p| p.popup_id == id)
        })
    }
}

impl ItemConsts for ContextMenu {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<Self, CachedRenderingData> =
        Self::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_ContextMenuVTable() -> ContextMenuVTable for ContextMenu
}

#[cfg(feature = "ffi")]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_contextmenu_close(
    s: Pin<&ContextMenu>,
    window_adapter: *const crate::window::ffi::WindowAdapterRcOpaque,
    self_component: &vtable::VRc<crate::item_tree::ItemTreeVTable>,
    self_index: u32,
) {
    unsafe {
        let window_adapter = &*(window_adapter as *const Rc<dyn WindowAdapter>);
        let self_rc = ItemRc::new(self_component.clone(), self_index);
        s.close(window_adapter, &self_rc);
    }
}

#[cfg(feature = "ffi")]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_contextmenu_is_open(
    s: Pin<&ContextMenu>,
    window_adapter: *const crate::window::ffi::WindowAdapterRcOpaque,
    self_component: &vtable::VRc<crate::item_tree::ItemTreeVTable>,
    self_index: u32,
) -> bool {
    unsafe {
        let window_adapter = &*(window_adapter as *const Rc<dyn WindowAdapter>);
        let self_rc = ItemRc::new(self_component.clone(), self_index);
        s.is_open(window_adapter, &self_rc)
    }
}

/// The implementation of the `BoxShadow` element
#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
pub struct BoxShadow {
    pub border_top_left_radius: Property<LogicalLength>,
    pub border_top_right_radius: Property<LogicalLength>,
    pub border_bottom_left_radius: Property<LogicalLength>,
    pub border_bottom_right_radius: Property<LogicalLength>,
    // Shadow specific properties
    pub offset_x: Property<LogicalLength>,
    pub offset_y: Property<LogicalLength>,
    pub color: Property<Color>,
    pub blur: Property<LogicalLength>,
    pub spread: Property<LogicalLength>,
    pub inset: Property<bool>,
    pub cached_rendering_data: CachedRenderingData,
}

impl BoxShadow {
    pub fn logical_border_radius(self: Pin<&Self>) -> LogicalBorderRadius {
        LogicalBorderRadius::from_lengths(
            self.border_top_left_radius(),
            self.border_top_right_radius(),
            self.border_bottom_right_radius(),
            self.border_bottom_left_radius(),
        )
    }
}

impl Item for BoxShadow {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo { stretch: 1., ..LayoutInfo::default() }
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        InputEventFilterResult::ForwardAndIgnore
    }

    fn input_event(
        self: Pin<&Self>,
        _: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        backend: &mut ItemRendererRef,
        self_rc: &ItemRc,
        size: LogicalSize,
    ) -> RenderingResult {
        (*backend).draw_box_shadow(self, self_rc, size);
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        if self.inset() {
            // Inset shadow paints inside the geometry; never extends outside.
            geometry
        } else {
            let pad = self.blur() + LogicalLength::new(self.spread().get().max(0 as crate::Coord));
            geometry
                .outer_rect(euclid::SideOffsets2D::from_length_all_same(pad))
                .translate(LogicalVector::from_lengths(self.offset_x(), self.offset_y()))
        }
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl ItemConsts for BoxShadow {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<Self, CachedRenderingData> =
        Self::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_BoxShadowVTable() -> BoxShadowVTable for BoxShadow
}

declare_item_vtable! {
    fn slint_get_ComponentContainerVTable() -> ComponentContainerVTable for ComponentContainer
}

declare_item_vtable! {
    fn slint_get_ComplexTextVTable() -> ComplexTextVTable for ComplexText
}

declare_item_vtable! {
    fn slint_get_StyledTextItemVTable() -> StyledTextItemVTable for StyledTextItem
}

declare_item_vtable! {
    fn slint_get_SimpleTextVTable() -> SimpleTextVTable for SimpleText
}

declare_item_vtable! {
    fn slint_get_TextInputVTable() -> TextInputVTable for TextInput
}

declare_item_vtable! {
    fn slint_get_ImageItemVTable() -> ImageItemVTable for ImageItem
}

declare_item_vtable! {
    fn slint_get_ClippedImageVTable() -> ClippedImageVTable for ClippedImage
}

#[cfg(feature = "path")]
declare_item_vtable! {
    fn slint_get_PathVTable() -> PathVTable for Path
}

declare_item_vtable! {
    fn slint_get_MenuItemVTable() -> MenuItemVTable for MenuItem
}

declare_item_vtable! {
    fn slint_get_SystemTrayIconVTable() -> SystemTrayIconVTable for SystemTrayIcon
}

macro_rules! declare_enums {
    ($( $(#[$enum_doc:meta])* $vis:vis enum $Name:ident { $( $(#[$value_doc:meta])* $Value:ident,)* })*) => {
        $(
            #[derive(Copy, Clone, Debug, PartialEq, Eq, strum::EnumString, strum::Display, Hash)]
            #[repr(u32)]
            #[strum(serialize_all = "kebab-case")]
            $(#[$enum_doc])*
            pub enum $Name {
                $( $(#[$value_doc])* $Value),*
            }

            impl Default for $Name {
                fn default() -> Self {
                    // Always return the first value
                    ($(Self::$Value,)*).0
                }
            }
        )*
    };
}

i_slint_common::for_each_enums!(declare_enums);

/// Internal transparent hover tracker synthesized by tooltip lowering.
#[repr(C)]
#[derive(FieldOffsets, Default, SlintElement)]
#[pin]
pub struct TooltipArea {
    pub has_hover: Property<bool>,
    pub mouse_x: Property<LogicalLength>,
    pub mouse_y: Property<LogicalLength>,
    pub text: Property<crate::styled_text::StyledText>,
    pub delay: Property<i64>,
    pub offset: Property<LogicalLength>,
    pub show: Callback<VoidArg>,
    pub hide: Callback<VoidArg>,
    pub cached_rendering_data: CachedRenderingData,
    popup_visible: Cell<bool>,
    timer: crate::timers::Timer,
}

impl Item for TooltipArea {
    fn init(self: Pin<&Self>, _self_rc: &ItemRc) {}

    fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>) {}

    fn layout_info(
        self: Pin<&Self>,
        _orientation: Orientation,
        _cross_axis_constraint: Coord,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> LayoutInfo {
        LayoutInfo::default()
    }

    fn input_event_filter_before_children(
        self: Pin<&Self>,
        event: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventFilterResult {
        // Track hover in the filter stage so enter/leave transitions are reliable,
        // independent of later input handling.
        if matches!(event, MouseEvent::DragMove { .. } | MouseEvent::Drop { .. }) {
            self.set_hover_state(false, self_rc);
            return InputEventFilterResult::ForwardAndIgnore;
        }

        if let Some(pos) = event.position() {
            Self::FIELD_OFFSETS.mouse_x().apply_pin(self).set(pos.x_length());
            Self::FIELD_OFFSETS.mouse_y().apply_pin(self).set(pos.y_length());
        }

        let next_hover = !matches!(event, MouseEvent::Exit);
        self.set_hover_state(next_hover, self_rc);

        if next_hover && !self.popup_visible.get() && matches!(event, MouseEvent::Moved { .. }) {
            self.schedule_show(self_rc);
        }

        // Observe without claiming: siblings still receive the event; the routing tracks
        // this item on its observers side-list and delivers Exit when the pointer leaves.
        InputEventFilterResult::ForwardAndObserve
    }

    fn input_event(
        self: Pin<&Self>,
        event: &MouseEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        _: &mut MouseCursorInner,
    ) -> InputEventResult {
        if matches!(event, MouseEvent::Exit) {
            self.set_hover_state(false, _self_rc);
        }
        InputEventResult::EventIgnored
    }

    fn capture_key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn key_event(
        self: Pin<&Self>,
        _: &InternalKeyEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> KeyEventResult {
        KeyEventResult::EventIgnored
    }

    fn focus_event(
        self: Pin<&Self>,
        _: &FocusEvent,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
    ) -> FocusEventResult {
        FocusEventResult::FocusIgnored
    }

    fn render(
        self: Pin<&Self>,
        _backend: &mut ItemRendererRef,
        _self_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        RenderingResult::ContinueRenderingChildren
    }

    fn bounding_rect(
        self: core::pin::Pin<&Self>,
        _window_adapter: &Rc<dyn WindowAdapter>,
        _self_rc: &ItemRc,
        geometry: LogicalRect,
    ) -> LogicalRect {
        geometry
    }

    fn clips_children(self: core::pin::Pin<&Self>) -> bool {
        false
    }
}

impl TooltipArea {
    fn schedule_show(self: Pin<&Self>, self_rc: &ItemRc) {
        let delay_ms = self.delay().max(0) as u64;
        if delay_ms == 0 {
            if self.has_hover() {
                self.show.call(&());
                self.popup_visible.set(true);
            }
            return;
        }

        let self_weak = self_rc.downgrade();
        // Start on the context this item's window belongs to, not on whichever one is
        // current: a component built with `new_with_context` must keep its timers there.
        let Some(window_adapter) = self_rc.window_adapter() else { return };
        let ctx = crate::window::WindowInner::from_pub(window_adapter.window()).context();
        self.timer.start_on(
            ctx,
            crate::timers::TimerMode::SingleShot,
            Duration::from_millis(delay_ms),
            move || {
                let Some(self_rc) = self_weak.upgrade() else { return };
                let Some(tooltip_area) = self_rc.downcast::<TooltipArea>() else { return };
                let tooltip_area = tooltip_area.as_pin_ref();
                if tooltip_area.has_hover() {
                    tooltip_area.show.call(&());
                    tooltip_area.popup_visible.set(true);
                }
            },
        );
    }

    fn hide_now(self: Pin<&Self>) {
        self.timer.stop();
        if self.popup_visible.replace(false) {
            self.hide.call(&());
        }
    }

    fn set_hover_state(self: Pin<&Self>, new_hover: bool, self_rc: &ItemRc) {
        let old_hover = self.has_hover();
        if old_hover == new_hover {
            return;
        }

        Self::FIELD_OFFSETS.has_hover().apply_pin(self).set(new_hover);
        if new_hover {
            self.schedule_show(self_rc);
        } else {
            self.hide_now();
        }
    }
}

impl ItemConsts for TooltipArea {
    const cached_rendering_data_offset: const_field_offset::FieldOffset<
        TooltipArea,
        CachedRenderingData,
    > = TooltipArea::FIELD_OFFSETS.cached_rendering_data().as_unpinned_projection();
}

declare_item_vtable! {
    fn slint_get_TooltipAreaVTable() -> TooltipAreaVTable for TooltipArea
}

/// Expands to a builtin struct field's declared default value,
/// or to the zero value of the field's type when no default is declared.
/// Number literals for `Coord` fields are cast, because `Coord` is `f32` or `i32`
/// depending on `cfg(slint_int_coord)`.
macro_rules! builtin_struct_field_default {
    (Coord, $default:expr) => {
        ($default) as Coord
    };
    ($field_type:ident, $default:expr) => {
        $default
    };
    ($field_type:ident) => {
        ::core::default::Default::default()
    };
}

/// Expands to the documentation text of a builtin struct field's declared default value:
/// an intra-doc link to the variant for an enum value, plain code for a literal.
/// The parentheses an enum value needs to be a single token tree are dropped.
macro_rules! builtin_struct_field_default_doc {
    (($($default:tt)*)) => {
        builtin_struct_field_default_doc!($($default)*)
    };
    ($enum:ident :: $value:ident) => {
        concat!("[`", stringify!($enum), "::", stringify!($value), "`]")
    };
    ($default:literal) => {
        concat!("`", stringify!($default), "`")
    };
}

macro_rules! declare_builtin_structs {
    ($(
        $(#[$struct_attr:meta])*
        $vis:vis struct $Name:ident {
            $( $(#[$field_attr:meta])* $field:ident : $field_type:ident $(= $field_default:tt)?, )*
        }
    )*) => {
        $(
            #[derive(Clone, Debug, PartialEq)]
            #[repr(C)]
            $(#[$struct_attr])*
            pub struct $Name {
                $(
                    $(#[$field_attr])*
                    $(
                        #[doc = ""]
                        #[doc = concat!("Defaults to ", builtin_struct_field_default_doc!($field_default), ".")]
                    )?
                    pub $field : $field_type,
                )*
            }

            // Not derived, so that the fields take their declared default values
            impl ::core::default::Default for $Name {
                fn default() -> Self {
                    Self {
                        $($field: builtin_struct_field_default!($field_type $(, $field_default)?),)*
                    }
                }
            }
        )*
    };
}

i_slint_common::for_each_builtin_structs!(declare_builtin_structs);

#[test]
fn builtin_struct_field_defaults() {
    // Fields without a declared default value take the zero value of their type,
    // like with derive(Default)
    let table_column = TableColumn::default();
    assert_eq!(table_column.sort_order, SortOrder::Unsorted);
    assert_eq!(table_column.min_width, 0 as Coord);
    assert_eq!(table_column.horizontal_stretch, 0.0);
    assert_eq!(table_column.title, SharedString::default());
    assert!(!KeyEvent::default().repeat);
    assert_eq!(PointerEvent::default().touch_finger_id, 0);

    // Fields with a declared default value take it
    let hints = InputMethodHints::default();
    assert_eq!(hints.capitalization, CapitalizationMode::Sentences);
    assert!(hints.auto_correct);
    assert!(hints.auto_complete);
}

#[cfg(feature = "ffi")]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn slint_item_absolute_position(
    self_component: &vtable::VRc<crate::item_tree::ItemTreeVTable>,
    self_index: u32,
) -> crate::lengths::LogicalPoint {
    let self_rc = ItemRc::new(self_component.clone(), self_index);
    // Map the item's own geometry origin through the ancestor transforms so the result is the
    // item's absolute position, not its parent's.
    self_rc.map_to_window(self_rc.geometry().origin)
}