ferroui-base 0.2.0

// @generated by scripts/generate_composition.py — do not edit

//! `CompositionTarget`.
//!
//! Schema attributes: internal, custom constructor on the server.

use bitflags::bitflags;
use crate::Size;
use crate::rendering::LayoutPassTiming;
use crate::rendering::RendererDebugOverlays;
use crate::rendering::composition::CompositionTransparencyLevel;
use crate::rendering::composition::ICompositionObject;
use crate::rendering::composition::ICompositionObjectHost;
use crate::rendering::composition::expressions::ExpressionVariant;
use crate::rendering::composition::server::AsServerRenderResource;
use crate::rendering::composition::server::CompositionProperty;
use crate::rendering::composition::server::CompositionPropertyOf;
use crate::rendering::composition::server::IServerAnimatedPropertyHost;
use crate::rendering::composition::server::IServerObject;
use crate::rendering::composition::server::ServerPropertyValue;
use crate::rendering::composition::server::ServerValueChange;
use crate::rendering::composition::server::props_of;
use crate::rendering::composition::server::read_server_object;
use crate::rendering::composition::transport::BatchStreamReader;
use crate::rendering::composition::transport::BatchStreamWriter;
use crate::rendering::composition::transport::BatchValue;
use crate::rendering::composition::transport::BatchValueReader;
use std::any::Any;
use std::any::TypeId;
use std::cell::Cell;
use std::cell::RefCell;
use std::rc::Rc;
use std::sync::Arc;
use std::sync::OnceLock;
use std::time::Duration;

bitflags! {
    /// The fields of `CompositionTarget` that changed since its last serialization.
    #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
    pub struct CompositionTargetChangedFields: u8 {
        const ROOT = 1;
        const IS_ENABLED = 2;
        const DEBUG_OVERLAYS = 4;
        const LAST_LAYOUT_PASS_TIMING = 8;
        const SCALING = 16;
        const SIZE = 32;
        const TRANSPARENCY_LEVEL = 64;
        const PLATFORM_SPECIFIC_SCENE_INFO = 128;
    }
}

impl BatchValue for CompositionTargetChangedFields {
    #[inline]
    fn write_to(&self, out: &mut Vec<u8>) {
        self.bits().write_to(out);
    }

    #[inline]
    fn read_from(input: &mut BatchValueReader<'_>) -> Self {
        CompositionTargetChangedFields::from_bits_retain(u8::read_from(input))
    }
}

/// The partial methods of `CompositionTarget`: implemented by the class that embeds
/// [`CompositionTargetProps`]. Every hook defaults to doing nothing.
pub trait CompositionTargetHooks: ICompositionObjectHost {
    fn initialize_defaults_extra(&self) {}

    fn validate_root_change(&self, _old_value: &Option<Rc<dyn ICompositionObject>>, _new_value: &Option<Rc<dyn ICompositionObject>>) {}
    fn on_root_changed(&self) {}
    fn on_root_changing(&self) {}

    fn validate_is_enabled_change(&self, _old_value: bool, _new_value: bool) {}
    fn on_is_enabled_changed(&self) {}
    fn on_is_enabled_changing(&self) {}

    fn validate_debug_overlays_change(&self, _old_value: RendererDebugOverlays, _new_value: RendererDebugOverlays) {}
    fn on_debug_overlays_changed(&self) {}
    fn on_debug_overlays_changing(&self) {}

    fn validate_last_layout_pass_timing_change(&self, _old_value: LayoutPassTiming, _new_value: LayoutPassTiming) {}
    fn on_last_layout_pass_timing_changed(&self) {}
    fn on_last_layout_pass_timing_changing(&self) {}

    fn validate_scaling_change(&self, _old_value: f64, _new_value: f64) {}
    fn on_scaling_changed(&self) {}
    fn on_scaling_changing(&self) {}

    fn validate_size_change(&self, _old_value: Size, _new_value: Size) {}
    fn on_size_changed(&self) {}
    fn on_size_changing(&self) {}

    fn validate_transparency_level_change(&self, _old_value: CompositionTransparencyLevel, _new_value: CompositionTransparencyLevel) {}
    fn on_transparency_level_changed(&self) {}
    fn on_transparency_level_changing(&self) {}

    fn validate_platform_specific_scene_info_change(&self, _old_value: &Option<Arc<dyn Any + Send + Sync>>, _new_value: &Option<Arc<dyn Any + Send + Sync>>) {}
    fn on_platform_specific_scene_info_changed(&self) {}
    fn on_platform_specific_scene_info_changing(&self) {}
}

/// The UI-thread properties of `CompositionTarget`.
pub struct CompositionTargetProps {
    changed_fields_of_composition_target: Cell<CompositionTargetChangedFields>,
    root: RefCell<Option<Rc<dyn ICompositionObject>>>,
    is_enabled: Cell<bool>,
    debug_overlays: Cell<RendererDebugOverlays>,
    last_layout_pass_timing: Cell<LayoutPassTiming>,
    scaling: Cell<f64>,
    size: Cell<Size>,
    transparency_level: Cell<CompositionTransparencyLevel>,
    platform_specific_scene_info: RefCell<Option<Arc<dyn Any + Send + Sync>>>,
}

impl Default for CompositionTargetProps {
    fn default() -> Self {
        Self::new()
    }
}

impl CompositionTargetProps {
    /// Creates the properties with every field at the default of its type.
    /// The defaults of the schema are applied by
    /// [`initialize_defaults`](Self::initialize_defaults).
    pub fn new() -> Self {
        Self {
            changed_fields_of_composition_target: Cell::new(CompositionTargetChangedFields::empty()),
            root: RefCell::new(None),
            is_enabled: Cell::new(Default::default()),
            debug_overlays: Cell::new(Default::default()),
            last_layout_pass_timing: Cell::new(Default::default()),
            scaling: Cell::new(Default::default()),
            size: Cell::new(Default::default()),
            transparency_level: Cell::new(Default::default()),
            platform_specific_scene_info: RefCell::new(None),
        }
    }

    /// The `InitializeDefaults` calls of the constructor chain: the base
    /// classes first, then this class.
    pub fn initialize_defaults(&self, host: &dyn CompositionTargetHooks) {
        self.initialize_own_defaults(host);
    }

    /// `InitializeDefaults` of this class alone.
    pub fn initialize_own_defaults(&self, host: &dyn CompositionTargetHooks) {
        CompositionTargetHooks::initialize_defaults_extra(host);
    }

    /// `Root`.
    pub fn root(&self) -> Option<Rc<dyn ICompositionObject>> {
        self.root.borrow().clone()
    }

    /// Sets `Root`.
    pub fn set_root(&self, host: &dyn CompositionTargetHooks, value: Option<Rc<dyn ICompositionObject>>) {
        let mut changed = false;
        let old_value = self.root.borrow().clone();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_root_change(host, &old_value, &value);
            CompositionTargetHooks::on_root_changing(host);
            changed = true;
            // Update the backing value
            *self.root.borrow_mut() = value.clone();
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::ROOT);
            host.register_for_serialization();
        }
        *self.root.borrow_mut() = value;
        if changed {
            CompositionTargetHooks::on_root_changed(host);
        }
    }

    /// `IsEnabled`.
    pub fn is_enabled(&self) -> bool {
        self.is_enabled.get()
    }

    /// Sets `IsEnabled`.
    pub fn set_is_enabled(&self, host: &dyn CompositionTargetHooks, value: bool) {
        let mut changed = false;
        let old_value = self.is_enabled.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_is_enabled_change(host, old_value, value);
            CompositionTargetHooks::on_is_enabled_changing(host);
            changed = true;
            // Update the backing value
            self.is_enabled.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::IS_ENABLED);
            host.register_for_serialization();
        }
        self.is_enabled.set(value);
        if changed {
            CompositionTargetHooks::on_is_enabled_changed(host);
        }
    }

    /// `DebugOverlays`.
    pub fn debug_overlays(&self) -> RendererDebugOverlays {
        self.debug_overlays.get()
    }

    /// Sets `DebugOverlays`.
    pub fn set_debug_overlays(&self, host: &dyn CompositionTargetHooks, value: RendererDebugOverlays) {
        let mut changed = false;
        let old_value = self.debug_overlays.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_debug_overlays_change(host, old_value, value);
            CompositionTargetHooks::on_debug_overlays_changing(host);
            changed = true;
            // Update the backing value
            self.debug_overlays.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::DEBUG_OVERLAYS);
            host.register_for_serialization();
        }
        self.debug_overlays.set(value);
        if changed {
            CompositionTargetHooks::on_debug_overlays_changed(host);
        }
    }

    /// `LastLayoutPassTiming` (internal).
    pub fn last_layout_pass_timing(&self) -> LayoutPassTiming {
        self.last_layout_pass_timing.get()
    }

    /// Sets `LastLayoutPassTiming` (internal).
    pub fn set_last_layout_pass_timing(&self, host: &dyn CompositionTargetHooks, value: LayoutPassTiming) {
        let mut changed = false;
        let old_value = self.last_layout_pass_timing.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_last_layout_pass_timing_change(host, old_value, value);
            CompositionTargetHooks::on_last_layout_pass_timing_changing(host);
            changed = true;
            // Update the backing value
            self.last_layout_pass_timing.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::LAST_LAYOUT_PASS_TIMING);
            host.register_for_serialization();
        }
        self.last_layout_pass_timing.set(value);
        if changed {
            CompositionTargetHooks::on_last_layout_pass_timing_changed(host);
        }
    }

    /// `Scaling`.
    pub fn scaling(&self) -> f64 {
        self.scaling.get()
    }

    /// Sets `Scaling`.
    pub fn set_scaling(&self, host: &dyn CompositionTargetHooks, value: f64) {
        let mut changed = false;
        let old_value = self.scaling.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_scaling_change(host, old_value, value);
            CompositionTargetHooks::on_scaling_changing(host);
            changed = true;
            // Update the backing value
            self.scaling.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::SCALING);
            host.register_for_serialization();
        }
        self.scaling.set(value);
        if changed {
            CompositionTargetHooks::on_scaling_changed(host);
        }
    }

    /// `Size`.
    pub fn size(&self) -> Size {
        self.size.get()
    }

    /// Sets `Size`.
    pub fn set_size(&self, host: &dyn CompositionTargetHooks, value: Size) {
        let mut changed = false;
        let old_value = self.size.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_size_change(host, old_value, value);
            CompositionTargetHooks::on_size_changing(host);
            changed = true;
            // Update the backing value
            self.size.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::SIZE);
            host.register_for_serialization();
        }
        self.size.set(value);
        if changed {
            CompositionTargetHooks::on_size_changed(host);
        }
    }

    /// `TransparencyLevel`.
    pub fn transparency_level(&self) -> CompositionTransparencyLevel {
        self.transparency_level.get()
    }

    /// Sets `TransparencyLevel`.
    pub fn set_transparency_level(&self, host: &dyn CompositionTargetHooks, value: CompositionTransparencyLevel) {
        let mut changed = false;
        let old_value = self.transparency_level.get();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_transparency_level_change(host, old_value, value);
            CompositionTargetHooks::on_transparency_level_changing(host);
            changed = true;
            // Update the backing value
            self.transparency_level.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::TRANSPARENCY_LEVEL);
            host.register_for_serialization();
        }
        self.transparency_level.set(value);
        if changed {
            CompositionTargetHooks::on_transparency_level_changed(host);
        }
    }

    /// `PlatformSpecificSceneInfo`.
    pub fn platform_specific_scene_info(&self) -> Option<Arc<dyn Any + Send + Sync>> {
        self.platform_specific_scene_info.borrow().clone()
    }

    /// Sets `PlatformSpecificSceneInfo`.
    pub fn set_platform_specific_scene_info(&self, host: &dyn CompositionTargetHooks, value: Option<Arc<dyn Any + Send + Sync>>) {
        let mut changed = false;
        let old_value = self.platform_specific_scene_info.borrow().clone();
        if old_value.differs(&value) {
            CompositionTargetHooks::validate_platform_specific_scene_info_change(host, &old_value, &value);
            CompositionTargetHooks::on_platform_specific_scene_info_changing(host);
            changed = true;
            // Update the backing value
            *self.platform_specific_scene_info.borrow_mut() = value.clone();
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_target.set(self.changed_fields_of_composition_target.get() | CompositionTargetChangedFields::PLATFORM_SPECIFIC_SCENE_INFO);
            host.register_for_serialization();
        }
        *self.platform_specific_scene_info.borrow_mut() = value;
        if changed {
            CompositionTargetHooks::on_platform_specific_scene_info_changed(host);
        }
    }

    /// Writes the changes of the object: the base class first, then the
    /// changed-fields mask and the changed members of this class.
    pub fn serialize_changes_core(&self, _host: &dyn CompositionTargetHooks, writer: &mut BatchStreamWriter<'_>) {
        let changed = self.changed_fields_of_composition_target.get();
        writer.write(changed);
        if changed.contains(CompositionTargetChangedFields::ROOT) {
            writer.write_server_object(self.root.borrow().clone().map(|o| o.server()));
        }
        if changed.contains(CompositionTargetChangedFields::IS_ENABLED) {
            writer.write(self.is_enabled.get());
        }
        if changed.contains(CompositionTargetChangedFields::DEBUG_OVERLAYS) {
            writer.write(self.debug_overlays.get());
        }
        if changed.contains(CompositionTargetChangedFields::LAST_LAYOUT_PASS_TIMING) {
            writer.write(self.last_layout_pass_timing.get());
        }
        if changed.contains(CompositionTargetChangedFields::SCALING) {
            writer.write(self.scaling.get());
        }
        if changed.contains(CompositionTargetChangedFields::SIZE) {
            writer.write(self.size.get());
        }
        if changed.contains(CompositionTargetChangedFields::TRANSPARENCY_LEVEL) {
            writer.write(self.transparency_level.get());
        }
        if changed.contains(CompositionTargetChangedFields::PLATFORM_SPECIFIC_SCENE_INFO) {
            writer.write_value(self.platform_specific_scene_info.borrow().clone());
        }
        self.changed_fields_of_composition_target.set(CompositionTargetChangedFields::empty());
    }
}

/// The partial methods of `ServerCompositionTarget`: implemented by the class that embeds
/// [`ServerCompositionTargetProps`]. Every hook defaults to doing nothing.
pub trait ServerCompositionTargetHooks: IServerAnimatedPropertyHost {
    fn deserialize_changes_extra(&self, _reader: &mut BatchStreamReader<'_>) {}
    fn on_fields_deserialized(&self, _changed: CompositionTargetChangedFields) {}

    fn on_root_changed(&self) {}
    fn on_root_changing(&self) {}

    fn on_is_enabled_changed(&self) {}
    fn on_is_enabled_changing(&self) {}

    fn on_debug_overlays_changed(&self) {}
    fn on_debug_overlays_changing(&self) {}

    fn on_last_layout_pass_timing_changed(&self) {}
    fn on_last_layout_pass_timing_changing(&self) {}

    fn on_scaling_changed(&self) {}
    fn on_scaling_changing(&self) {}

    fn on_size_changed(&self) {}
    fn on_size_changing(&self) {}

    fn on_transparency_level_changed(&self) {}
    fn on_transparency_level_changing(&self) {}

    fn on_platform_specific_scene_info_changed(&self) {}
    fn on_platform_specific_scene_info_changing(&self) {}
}

/// The server-side properties of `ServerCompositionTarget`.
pub struct ServerCompositionTargetProps {
    root: RefCell<Option<Rc<dyn IServerObject>>>,
    is_enabled: Cell<bool>,
    debug_overlays: Cell<RendererDebugOverlays>,
    last_layout_pass_timing: Cell<LayoutPassTiming>,
    scaling: Cell<f64>,
    size: Cell<Size>,
    transparency_level: Cell<CompositionTransparencyLevel>,
    platform_specific_scene_info: RefCell<Option<Arc<dyn Any + Send + Sync>>>,
}

impl Default for ServerCompositionTargetProps {
    fn default() -> Self {
        Self::new()
    }
}

impl ServerCompositionTargetProps {
    /// Creates the properties with every field at the default of its type; the
    /// values of the UI thread arrive with the first batch.
    pub fn new() -> Self {
        Self {
            root: RefCell::new(None),
            is_enabled: Cell::new(Default::default()),
            debug_overlays: Cell::new(Default::default()),
            last_layout_pass_timing: Cell::new(Default::default()),
            scaling: Cell::new(Default::default()),
            size: Cell::new(Default::default()),
            transparency_level: Cell::new(Default::default()),
            platform_specific_scene_info: RefCell::new(None),
        }
    }

    /// This block or the block of a base class, by type: what
    /// `IServerObject::get_props` of the embedding class returns.
    pub fn find_props(&self, type_id: TypeId) -> Option<&dyn Any> {
        if type_id == TypeId::of::<Self>() {
            return Some(self);
        }
        None
    }

    /// The composition property of `Root`.
    pub fn id_of_root_property() -> &'static CompositionPropertyOf<Option<Rc<dyn IServerObject>>> {
        static PROPERTY: OnceLock<CompositionPropertyOf<Option<Rc<dyn IServerObject>>>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, Option<Rc<dyn IServerObject>>>(
                "Root",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).root.borrow().clone(),
                |obj, v| *props_of::<ServerCompositionTargetProps>(obj).root.borrow_mut() = v,
                None,
                None,
            )
        })
    }

    /// `Root`.
    pub fn root(&self) -> Option<Rc<dyn IServerObject>> {
        self.root.borrow().clone()
    }

    pub fn set_root(&self, host: &dyn ServerCompositionTargetHooks, value: Option<Rc<dyn IServerObject>>) {
        let old_value = self.root.borrow().clone();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_root_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_root_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: old_value.as_server_render_resource(),
                new_resource: value.as_server_render_resource(),
                assign: &mut || *self.root.borrow_mut() = value.clone(),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_root_changed(host);
        }
    }

    /// The composition property of `IsEnabled`.
    pub fn id_of_is_enabled_property() -> &'static CompositionPropertyOf<bool> {
        static PROPERTY: OnceLock<CompositionPropertyOf<bool>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, bool>(
                "IsEnabled",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).is_enabled.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).is_enabled.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionTargetProps>(obj).is_enabled.get())),
                None,
            )
        })
    }

    /// `IsEnabled`.
    pub fn is_enabled(&self) -> bool {
        self.is_enabled.get()
    }

    pub fn set_is_enabled(&self, host: &dyn ServerCompositionTargetHooks, value: bool) {
        let old_value = self.is_enabled.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_is_enabled_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_is_enabled_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.is_enabled.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_is_enabled_changed(host);
        }
    }

    /// The composition property of `DebugOverlays`.
    pub fn id_of_debug_overlays_property() -> &'static CompositionPropertyOf<RendererDebugOverlays> {
        static PROPERTY: OnceLock<CompositionPropertyOf<RendererDebugOverlays>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, RendererDebugOverlays>(
                "DebugOverlays",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).debug_overlays.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).debug_overlays.set(v),
                None,
                None,
            )
        })
    }

    /// `DebugOverlays`.
    pub fn debug_overlays(&self) -> RendererDebugOverlays {
        self.debug_overlays.get()
    }

    pub fn set_debug_overlays(&self, host: &dyn ServerCompositionTargetHooks, value: RendererDebugOverlays) {
        let old_value = self.debug_overlays.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_debug_overlays_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_debug_overlays_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.debug_overlays.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_debug_overlays_changed(host);
        }
    }

    /// The composition property of `LastLayoutPassTiming`.
    pub fn id_of_last_layout_pass_timing_property() -> &'static CompositionPropertyOf<LayoutPassTiming> {
        static PROPERTY: OnceLock<CompositionPropertyOf<LayoutPassTiming>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, LayoutPassTiming>(
                "LastLayoutPassTiming",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).last_layout_pass_timing.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).last_layout_pass_timing.set(v),
                None,
                None,
            )
        })
    }

    /// `LastLayoutPassTiming`.
    pub fn last_layout_pass_timing(&self) -> LayoutPassTiming {
        self.last_layout_pass_timing.get()
    }

    pub fn set_last_layout_pass_timing(&self, host: &dyn ServerCompositionTargetHooks, value: LayoutPassTiming) {
        let old_value = self.last_layout_pass_timing.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_last_layout_pass_timing_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_last_layout_pass_timing_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.last_layout_pass_timing.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_last_layout_pass_timing_changed(host);
        }
    }

    /// The composition property of `Scaling`.
    pub fn id_of_scaling_property() -> &'static CompositionPropertyOf<f64> {
        static PROPERTY: OnceLock<CompositionPropertyOf<f64>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, f64>(
                "Scaling",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).scaling.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).scaling.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionTargetProps>(obj).scaling.get())),
                None,
            )
        })
    }

    /// `Scaling`.
    pub fn scaling(&self) -> f64 {
        self.scaling.get()
    }

    pub fn set_scaling(&self, host: &dyn ServerCompositionTargetHooks, value: f64) {
        let old_value = self.scaling.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_scaling_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_scaling_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.scaling.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_scaling_changed(host);
        }
    }

    /// The composition property of `Size`.
    pub fn id_of_size_property() -> &'static CompositionPropertyOf<Size> {
        static PROPERTY: OnceLock<CompositionPropertyOf<Size>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, Size>(
                "Size",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).size.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).size.set(v),
                None,
                None,
            )
        })
    }

    /// `Size`.
    pub fn size(&self) -> Size {
        self.size.get()
    }

    pub fn set_size(&self, host: &dyn ServerCompositionTargetHooks, value: Size) {
        let old_value = self.size.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_size_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_size_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.size.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_size_changed(host);
        }
    }

    /// The composition property of `TransparencyLevel`.
    pub fn id_of_transparency_level_property() -> &'static CompositionPropertyOf<CompositionTransparencyLevel> {
        static PROPERTY: OnceLock<CompositionPropertyOf<CompositionTransparencyLevel>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, CompositionTransparencyLevel>(
                "TransparencyLevel",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).transparency_level.get(),
                |obj, v| props_of::<ServerCompositionTargetProps>(obj).transparency_level.set(v),
                None,
                None,
            )
        })
    }

    /// `TransparencyLevel`.
    pub fn transparency_level(&self) -> CompositionTransparencyLevel {
        self.transparency_level.get()
    }

    pub fn set_transparency_level(&self, host: &dyn ServerCompositionTargetHooks, value: CompositionTransparencyLevel) {
        let old_value = self.transparency_level.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_transparency_level_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_transparency_level_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.transparency_level.set(value),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_transparency_level_changed(host);
        }
    }

    /// The composition property of `PlatformSpecificSceneInfo`.
    pub fn id_of_platform_specific_scene_info_property() -> &'static CompositionPropertyOf<Option<Arc<dyn Any + Send + Sync>>> {
        static PROPERTY: OnceLock<CompositionPropertyOf<Option<Arc<dyn Any + Send + Sync>>>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionTargetProps, Option<Arc<dyn Any + Send + Sync>>>(
                "PlatformSpecificSceneInfo",
                "ServerCompositionTarget",
                |obj| props_of::<ServerCompositionTargetProps>(obj).platform_specific_scene_info.borrow().clone(),
                |obj, v| *props_of::<ServerCompositionTargetProps>(obj).platform_specific_scene_info.borrow_mut() = v,
                None,
                None,
            )
        })
    }

    /// `PlatformSpecificSceneInfo`.
    pub fn platform_specific_scene_info(&self) -> Option<Arc<dyn Any + Send + Sync>> {
        self.platform_specific_scene_info.borrow().clone()
    }

    pub fn set_platform_specific_scene_info(&self, host: &dyn ServerCompositionTargetHooks, value: Option<Arc<dyn Any + Send + Sync>>) {
        let old_value = self.platform_specific_scene_info.borrow().clone();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionTargetHooks::on_platform_specific_scene_info_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_platform_specific_scene_info_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || *self.platform_specific_scene_info.borrow_mut() = value.clone(),
            },
        );
        if changed {
            ServerCompositionTargetHooks::on_platform_specific_scene_info_changed(host);
        }
    }

    /// Reads the changes of the object: the base class first, then the
    /// changed-fields mask and the changed members of this class.
    pub fn deserialize_changes_core(
        &self,
        host: &dyn ServerCompositionTargetHooks,
        reader: &mut BatchStreamReader<'_>,
        _committed_at: Duration,
    ) {
        let compositor = host.server_compositor();
        ServerCompositionTargetHooks::deserialize_changes_extra(host, reader);
        let changed = reader.read::<CompositionTargetChangedFields>();
        if changed.contains(CompositionTargetChangedFields::ROOT) {
            let value = read_server_object(reader, compositor.as_ref());
            self.set_root(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::IS_ENABLED) {
            let value = reader.read::<bool>();
            self.set_is_enabled(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::DEBUG_OVERLAYS) {
            let value = reader.read::<RendererDebugOverlays>();
            self.set_debug_overlays(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::LAST_LAYOUT_PASS_TIMING) {
            let value = reader.read::<LayoutPassTiming>();
            self.set_last_layout_pass_timing(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::SCALING) {
            let value = reader.read::<f64>();
            self.set_scaling(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::SIZE) {
            let value = reader.read::<Size>();
            self.set_size(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::TRANSPARENCY_LEVEL) {
            let value = reader.read::<CompositionTransparencyLevel>();
            self.set_transparency_level(host, value);
        }
        if changed.contains(CompositionTargetChangedFields::PLATFORM_SPECIFIC_SCENE_INFO) {
            let value = reader.read_value::<Arc<dyn Any + Send + Sync>>();
            self.set_platform_specific_scene_info(host, value);
        }
        ServerCompositionTargetHooks::on_fields_deserialized(host, changed);
    }

    /// The composition property with the given name, among the properties
    /// of this class and of its generated bases that have a variant form.
    pub fn get_composition_property(name: &str) -> Option<&'static CompositionProperty> {
        if name == "IsEnabled" {
            return Some(Self::id_of_is_enabled_property().base());
        }
        if name == "Scaling" {
            return Some(Self::id_of_scaling_property().base());
        }
        None
    }
}