ferroui-base 0.4.0

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

//! `CompositionViewBox`.
//!
//! Defined by the FerroUI overlay (scripts/composition-schema-winui.xml).

use bitflags::bitflags;
use crate::Vector;
use crate::rendering::composition::CompositionStretch;
use crate::rendering::composition::ICompositionObjectHost;
use crate::rendering::composition::animations::AnimationInstanceFactory;
use crate::rendering::composition::animations::ICompositionAnimation;
use crate::rendering::composition::expressions::ExpressionVariant;
use crate::rendering::composition::server::CompositionProperty;
use crate::rendering::composition::server::CompositionPropertyOf;
use crate::rendering::composition::server::IServerAnimatedPropertyHost;
use crate::rendering::composition::server::ServerPropertyValue;
use crate::rendering::composition::server::ServerValueChange;
use crate::rendering::composition::server::props_of;
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::sync::OnceLock;
use std::time::Duration;

bitflags! {
    /// The fields of `CompositionViewBox` that changed since its last serialization.
    #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
    pub struct CompositionViewBoxChangedFields: u16 {
        const HORIZONTAL_ALIGNMENT_RATIO = 1;
        const HORIZONTAL_ALIGNMENT_RATIO_ANIMATED = 2;
        const OFFSET = 4;
        const OFFSET_ANIMATED = 8;
        const SIZE = 16;
        const SIZE_ANIMATED = 32;
        const STRETCH = 64;
        const VERTICAL_ALIGNMENT_RATIO = 128;
        const VERTICAL_ALIGNMENT_RATIO_ANIMATED = 256;
    }
}

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

    #[inline]
    fn read_from(input: &mut BatchValueReader<'_>) -> Self {
        CompositionViewBoxChangedFields::from_bits_retain(u16::read_from(input))
    }
}

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

    fn validate_horizontal_alignment_ratio_change(&self, _old_value: f32, _new_value: f32) {}
    fn on_horizontal_alignment_ratio_changed(&self) {}
    fn on_horizontal_alignment_ratio_changing(&self) {}

    fn validate_offset_change(&self, _old_value: Vector, _new_value: Vector) {}
    fn on_offset_changed(&self) {}
    fn on_offset_changing(&self) {}

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

    fn validate_stretch_change(&self, _old_value: CompositionStretch, _new_value: CompositionStretch) {}
    fn on_stretch_changed(&self) {}
    fn on_stretch_changing(&self) {}

    fn validate_vertical_alignment_ratio_change(&self, _old_value: f32, _new_value: f32) {}
    fn on_vertical_alignment_ratio_changed(&self) {}
    fn on_vertical_alignment_ratio_changing(&self) {}
}

/// The UI-thread properties of `CompositionViewBox`.
pub struct CompositionViewBoxProps {
    changed_fields_of_composition_view_box: Cell<CompositionViewBoxChangedFields>,
    horizontal_alignment_ratio: Cell<f32>,
    offset: Cell<Vector>,
    size: Cell<Vector>,
    stretch: Cell<CompositionStretch>,
    vertical_alignment_ratio: Cell<f32>,
}

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

impl CompositionViewBoxProps {
    /// 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_view_box: Cell::new(CompositionViewBoxChangedFields::empty()),
            horizontal_alignment_ratio: Cell::new(Default::default()),
            offset: Cell::new(Default::default()),
            size: Cell::new(Default::default()),
            stretch: Cell::new(Default::default()),
            vertical_alignment_ratio: Cell::new(Default::default()),
        }
    }

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

    /// `InitializeDefaults` of this class alone.
    pub fn initialize_own_defaults(&self, host: &dyn CompositionViewBoxHooks) {
        CompositionViewBoxHooks::initialize_defaults_extra(host);
        self.set_horizontal_alignment_ratio(host, 0.5);
        self.set_stretch(host, CompositionStretch::Fill);
        self.set_vertical_alignment_ratio(host, 0.5);
    }

    /// `HorizontalAlignmentRatio` (animated, default `0.5`, FerroUI overlay).
    pub fn horizontal_alignment_ratio(&self) -> f32 {
        self.horizontal_alignment_ratio.get()
    }

    /// Sets `HorizontalAlignmentRatio` (animated, default `0.5`, FerroUI overlay).
    pub fn set_horizontal_alignment_ratio(&self, host: &dyn CompositionViewBoxHooks, value: f32) {
        let mut changed = false;
        let old_value = self.horizontal_alignment_ratio.get();
        if old_value.differs(&value) {
            CompositionViewBoxHooks::validate_horizontal_alignment_ratio_change(host, old_value, value);
            CompositionViewBoxHooks::on_horizontal_alignment_ratio_changing(host);
            changed = true;
            // Update the backing value
            self.horizontal_alignment_ratio.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO);
            host.register_for_serialization();
            // Reset previous animation if any
            host.pending_animations().remove(ServerCompositionViewBoxProps::id_of_horizontal_alignment_ratio_property().base());
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() & !CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO_ANIMATED);
            // Check for implicit animations
            if let Some(animation) = host.implicit_animation("HorizontalAlignmentRatio") {
                // Animation affects only current property
                if let Some(a) = animation.as_composition_animation() {
                    self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO_ANIMATED);
                    host.pending_animations().set(
                        ServerCompositionViewBoxProps::id_of_horizontal_alignment_ratio_property().base(),
                        a.create_instance(host.server(), Some(ExpressionVariant::create(value))),
                    );
                }
                // Animation is triggered by the current field, but does not necessary affects it
                host.start_animation_group(&animation, "HorizontalAlignmentRatio", ExpressionVariant::create(value));
            }
        }
        self.horizontal_alignment_ratio.set(value);
        if changed {
            CompositionViewBoxHooks::on_horizontal_alignment_ratio_changed(host);
        }
    }

    /// `Offset` (animated, FerroUI overlay).
    pub fn offset(&self) -> Vector {
        self.offset.get()
    }

    /// Sets `Offset` (animated, FerroUI overlay).
    pub fn set_offset(&self, host: &dyn CompositionViewBoxHooks, value: Vector) {
        let mut changed = false;
        let old_value = self.offset.get();
        if old_value.differs(&value) {
            CompositionViewBoxHooks::validate_offset_change(host, old_value, value);
            CompositionViewBoxHooks::on_offset_changing(host);
            changed = true;
            // Update the backing value
            self.offset.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::OFFSET);
            host.register_for_serialization();
            // Reset previous animation if any
            host.pending_animations().remove(ServerCompositionViewBoxProps::id_of_offset_property().base());
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() & !CompositionViewBoxChangedFields::OFFSET_ANIMATED);
            // Check for implicit animations
            if let Some(animation) = host.implicit_animation("Offset") {
                // Animation affects only current property
                if let Some(a) = animation.as_composition_animation() {
                    self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::OFFSET_ANIMATED);
                    host.pending_animations().set(
                        ServerCompositionViewBoxProps::id_of_offset_property().base(),
                        a.create_instance(host.server(), Some(ExpressionVariant::create(value))),
                    );
                }
                // Animation is triggered by the current field, but does not necessary affects it
                host.start_animation_group(&animation, "Offset", ExpressionVariant::create(value));
            }
        }
        self.offset.set(value);
        if changed {
            CompositionViewBoxHooks::on_offset_changed(host);
        }
    }

    /// `Size` (animated, FerroUI overlay).
    pub fn size(&self) -> Vector {
        self.size.get()
    }

    /// Sets `Size` (animated, FerroUI overlay).
    pub fn set_size(&self, host: &dyn CompositionViewBoxHooks, value: Vector) {
        let mut changed = false;
        let old_value = self.size.get();
        if old_value.differs(&value) {
            CompositionViewBoxHooks::validate_size_change(host, old_value, value);
            CompositionViewBoxHooks::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_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::SIZE);
            host.register_for_serialization();
            // Reset previous animation if any
            host.pending_animations().remove(ServerCompositionViewBoxProps::id_of_size_property().base());
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() & !CompositionViewBoxChangedFields::SIZE_ANIMATED);
            // Check for implicit animations
            if let Some(animation) = host.implicit_animation("Size") {
                // Animation affects only current property
                if let Some(a) = animation.as_composition_animation() {
                    self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::SIZE_ANIMATED);
                    host.pending_animations().set(
                        ServerCompositionViewBoxProps::id_of_size_property().base(),
                        a.create_instance(host.server(), Some(ExpressionVariant::create(value))),
                    );
                }
                // Animation is triggered by the current field, but does not necessary affects it
                host.start_animation_group(&animation, "Size", ExpressionVariant::create(value));
            }
        }
        self.size.set(value);
        if changed {
            CompositionViewBoxHooks::on_size_changed(host);
        }
    }

    /// `Stretch` (default `CompositionStretch::Fill`, FerroUI overlay).
    pub fn stretch(&self) -> CompositionStretch {
        self.stretch.get()
    }

    /// Sets `Stretch` (default `CompositionStretch::Fill`, FerroUI overlay).
    pub fn set_stretch(&self, host: &dyn CompositionViewBoxHooks, value: CompositionStretch) {
        let mut changed = false;
        let old_value = self.stretch.get();
        if old_value.differs(&value) {
            CompositionViewBoxHooks::validate_stretch_change(host, old_value, value);
            CompositionViewBoxHooks::on_stretch_changing(host);
            changed = true;
            // Update the backing value
            self.stretch.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::STRETCH);
            host.register_for_serialization();
        }
        self.stretch.set(value);
        if changed {
            CompositionViewBoxHooks::on_stretch_changed(host);
        }
    }

    /// `VerticalAlignmentRatio` (animated, default `0.5`, FerroUI overlay).
    pub fn vertical_alignment_ratio(&self) -> f32 {
        self.vertical_alignment_ratio.get()
    }

    /// Sets `VerticalAlignmentRatio` (animated, default `0.5`, FerroUI overlay).
    pub fn set_vertical_alignment_ratio(&self, host: &dyn CompositionViewBoxHooks, value: f32) {
        let mut changed = false;
        let old_value = self.vertical_alignment_ratio.get();
        if old_value.differs(&value) {
            CompositionViewBoxHooks::validate_vertical_alignment_ratio_change(host, old_value, value);
            CompositionViewBoxHooks::on_vertical_alignment_ratio_changing(host);
            changed = true;
            // Update the backing value
            self.vertical_alignment_ratio.set(value);
            // Register object for serialization in the next batch
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO);
            host.register_for_serialization();
            // Reset previous animation if any
            host.pending_animations().remove(ServerCompositionViewBoxProps::id_of_vertical_alignment_ratio_property().base());
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() & !CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO_ANIMATED);
            // Check for implicit animations
            if let Some(animation) = host.implicit_animation("VerticalAlignmentRatio") {
                // Animation affects only current property
                if let Some(a) = animation.as_composition_animation() {
                    self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO_ANIMATED);
                    host.pending_animations().set(
                        ServerCompositionViewBoxProps::id_of_vertical_alignment_ratio_property().base(),
                        a.create_instance(host.server(), Some(ExpressionVariant::create(value))),
                    );
                }
                // Animation is triggered by the current field, but does not necessary affects it
                host.start_animation_group(&animation, "VerticalAlignmentRatio", ExpressionVariant::create(value));
            }
        }
        self.vertical_alignment_ratio.set(value);
        if changed {
            CompositionViewBoxHooks::on_vertical_alignment_ratio_changed(host);
        }
    }

    /// Connects an animation with the named property. Returns `false` when
    /// neither this class nor its generated bases have an animated property
    /// of that name: the caller continues with its hand-written base.
    pub fn start_animation(
        &self,
        host: &dyn CompositionViewBoxHooks,
        property_name: &str,
        animation: &dyn ICompositionAnimation,
        final_value: Option<ExpressionVariant>,
    ) -> bool {
        if property_name == "HorizontalAlignmentRatio" {
            let server = animation.create_instance(host.server(), final_value);
            host.pending_animations().set(ServerCompositionViewBoxProps::id_of_horizontal_alignment_ratio_property().base(), server);
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO_ANIMATED);
            host.register_for_serialization();
            return true;
        }
        if property_name == "Offset" {
            let server = animation.create_instance(host.server(), final_value);
            host.pending_animations().set(ServerCompositionViewBoxProps::id_of_offset_property().base(), server);
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::OFFSET_ANIMATED);
            host.register_for_serialization();
            return true;
        }
        if property_name == "Size" {
            let server = animation.create_instance(host.server(), final_value);
            host.pending_animations().set(ServerCompositionViewBoxProps::id_of_size_property().base(), server);
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::SIZE_ANIMATED);
            host.register_for_serialization();
            return true;
        }
        if property_name == "VerticalAlignmentRatio" {
            let server = animation.create_instance(host.server(), final_value);
            host.pending_animations().set(ServerCompositionViewBoxProps::id_of_vertical_alignment_ratio_property().base(), server);
            self.changed_fields_of_composition_view_box.set(self.changed_fields_of_composition_view_box.get() | CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO_ANIMATED);
            host.register_for_serialization();
            return true;
        }
        false
    }

    /// 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 CompositionViewBoxHooks, writer: &mut BatchStreamWriter<'_>) {
        let changed = self.changed_fields_of_composition_view_box.get();
        writer.write(changed);
        if changed.contains(CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO_ANIMATED) {
            writer.write_value(host.pending_animations().get_and_remove(ServerCompositionViewBoxProps::id_of_horizontal_alignment_ratio_property().base()));
        } else if changed.contains(CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO) {
            writer.write(self.horizontal_alignment_ratio.get());
        }
        if changed.contains(CompositionViewBoxChangedFields::OFFSET_ANIMATED) {
            writer.write_value(host.pending_animations().get_and_remove(ServerCompositionViewBoxProps::id_of_offset_property().base()));
        } else if changed.contains(CompositionViewBoxChangedFields::OFFSET) {
            writer.write(self.offset.get());
        }
        if changed.contains(CompositionViewBoxChangedFields::SIZE_ANIMATED) {
            writer.write_value(host.pending_animations().get_and_remove(ServerCompositionViewBoxProps::id_of_size_property().base()));
        } else if changed.contains(CompositionViewBoxChangedFields::SIZE) {
            writer.write(self.size.get());
        }
        if changed.contains(CompositionViewBoxChangedFields::STRETCH) {
            writer.write(self.stretch.get());
        }
        if changed.contains(CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO_ANIMATED) {
            writer.write_value(host.pending_animations().get_and_remove(ServerCompositionViewBoxProps::id_of_vertical_alignment_ratio_property().base()));
        } else if changed.contains(CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO) {
            writer.write(self.vertical_alignment_ratio.get());
        }
        self.changed_fields_of_composition_view_box.set(CompositionViewBoxChangedFields::empty());
    }
}

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

    fn on_stretch_changed(&self) {}
    fn on_stretch_changing(&self) {}
}

/// The server-side properties of `ServerCompositionViewBox`.
pub struct ServerCompositionViewBoxProps {
    horizontal_alignment_ratio: Cell<f32>,
    offset: Cell<Vector>,
    size: Cell<Vector>,
    stretch: Cell<CompositionStretch>,
    vertical_alignment_ratio: Cell<f32>,
}

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

impl ServerCompositionViewBoxProps {
    /// 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 {
            horizontal_alignment_ratio: Cell::new(Default::default()),
            offset: Cell::new(Default::default()),
            size: Cell::new(Default::default()),
            stretch: Cell::new(Default::default()),
            vertical_alignment_ratio: Cell::new(Default::default()),
        }
    }

    /// 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 `HorizontalAlignmentRatio`.
    pub fn id_of_horizontal_alignment_ratio_property() -> &'static CompositionPropertyOf<f32> {
        static PROPERTY: OnceLock<CompositionPropertyOf<f32>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionViewBoxProps, f32>(
                "HorizontalAlignmentRatio",
                "ServerCompositionViewBox",
                |obj| props_of::<ServerCompositionViewBoxProps>(obj).horizontal_alignment_ratio.get(),
                |obj, v| props_of::<ServerCompositionViewBoxProps>(obj).horizontal_alignment_ratio.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionViewBoxProps>(obj).horizontal_alignment_ratio.get())),
                Some(|obj, v: ExpressionVariant| props_of::<ServerCompositionViewBoxProps>(obj).horizontal_alignment_ratio.set(v.cast_or_default::<f32>())),
            )
        })
    }

    /// `HorizontalAlignmentRatio` (animated).
    pub fn horizontal_alignment_ratio(&self) -> f32 {
        self.horizontal_alignment_ratio.get()
    }

    pub fn set_horizontal_alignment_ratio(&self, host: &dyn ServerCompositionViewBoxHooks, value: f32) {
        self.horizontal_alignment_ratio.set(value);
        host.remove_animation_for_property(Self::id_of_horizontal_alignment_ratio_property().base());
    }

    /// The composition property of `Offset`.
    pub fn id_of_offset_property() -> &'static CompositionPropertyOf<Vector> {
        static PROPERTY: OnceLock<CompositionPropertyOf<Vector>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionViewBoxProps, Vector>(
                "Offset",
                "ServerCompositionViewBox",
                |obj| props_of::<ServerCompositionViewBoxProps>(obj).offset.get(),
                |obj, v| props_of::<ServerCompositionViewBoxProps>(obj).offset.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionViewBoxProps>(obj).offset.get())),
                Some(|obj, v: ExpressionVariant| props_of::<ServerCompositionViewBoxProps>(obj).offset.set(v.cast_or_default::<Vector>())),
            )
        })
    }

    /// `Offset` (animated).
    pub fn offset(&self) -> Vector {
        self.offset.get()
    }

    pub fn set_offset(&self, host: &dyn ServerCompositionViewBoxHooks, value: Vector) {
        self.offset.set(value);
        host.remove_animation_for_property(Self::id_of_offset_property().base());
    }

    /// The composition property of `Size`.
    pub fn id_of_size_property() -> &'static CompositionPropertyOf<Vector> {
        static PROPERTY: OnceLock<CompositionPropertyOf<Vector>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionViewBoxProps, Vector>(
                "Size",
                "ServerCompositionViewBox",
                |obj| props_of::<ServerCompositionViewBoxProps>(obj).size.get(),
                |obj, v| props_of::<ServerCompositionViewBoxProps>(obj).size.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionViewBoxProps>(obj).size.get())),
                Some(|obj, v: ExpressionVariant| props_of::<ServerCompositionViewBoxProps>(obj).size.set(v.cast_or_default::<Vector>())),
            )
        })
    }

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

    pub fn set_size(&self, host: &dyn ServerCompositionViewBoxHooks, value: Vector) {
        self.size.set(value);
        host.remove_animation_for_property(Self::id_of_size_property().base());
    }

    /// The composition property of `Stretch`.
    pub fn id_of_stretch_property() -> &'static CompositionPropertyOf<CompositionStretch> {
        static PROPERTY: OnceLock<CompositionPropertyOf<CompositionStretch>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionViewBoxProps, CompositionStretch>(
                "Stretch",
                "ServerCompositionViewBox",
                |obj| props_of::<ServerCompositionViewBoxProps>(obj).stretch.get(),
                |obj, v| props_of::<ServerCompositionViewBoxProps>(obj).stretch.set(v),
                None,
                None,
            )
        })
    }

    /// `Stretch`.
    pub fn stretch(&self) -> CompositionStretch {
        self.stretch.get()
    }

    pub fn set_stretch(&self, host: &dyn ServerCompositionViewBoxHooks, value: CompositionStretch) {
        let old_value = self.stretch.get();
        let mut changed = false;
        if old_value.differs(&value) {
            ServerCompositionViewBoxHooks::on_stretch_changing(host);
            changed = true;
        }
        host.set_value(
            Self::id_of_stretch_property().base(),
            ServerValueChange {
                equal: old_value.default_equals(&value),
                old_resource: None,
                new_resource: None,
                assign: &mut || self.stretch.set(value),
            },
        );
        if changed {
            ServerCompositionViewBoxHooks::on_stretch_changed(host);
        }
    }

    /// The composition property of `VerticalAlignmentRatio`.
    pub fn id_of_vertical_alignment_ratio_property() -> &'static CompositionPropertyOf<f32> {
        static PROPERTY: OnceLock<CompositionPropertyOf<f32>> = OnceLock::new();
        PROPERTY.get_or_init(|| {
            CompositionProperty::register::<ServerCompositionViewBoxProps, f32>(
                "VerticalAlignmentRatio",
                "ServerCompositionViewBox",
                |obj| props_of::<ServerCompositionViewBoxProps>(obj).vertical_alignment_ratio.get(),
                |obj, v| props_of::<ServerCompositionViewBoxProps>(obj).vertical_alignment_ratio.set(v),
                Some(|obj| ExpressionVariant::create(props_of::<ServerCompositionViewBoxProps>(obj).vertical_alignment_ratio.get())),
                Some(|obj, v: ExpressionVariant| props_of::<ServerCompositionViewBoxProps>(obj).vertical_alignment_ratio.set(v.cast_or_default::<f32>())),
            )
        })
    }

    /// `VerticalAlignmentRatio` (animated).
    pub fn vertical_alignment_ratio(&self) -> f32 {
        self.vertical_alignment_ratio.get()
    }

    pub fn set_vertical_alignment_ratio(&self, host: &dyn ServerCompositionViewBoxHooks, value: f32) {
        self.vertical_alignment_ratio.set(value);
        host.remove_animation_for_property(Self::id_of_vertical_alignment_ratio_property().base());
    }

    /// 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 ServerCompositionViewBoxHooks,
        reader: &mut BatchStreamReader<'_>,
        committed_at: Duration,
    ) {
        ServerCompositionViewBoxHooks::deserialize_changes_extra(host, reader);
        let changed = reader.read::<CompositionViewBoxChangedFields>();
        if changed.contains(CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO_ANIMATED) {
            let Some(animation) = reader.read_value::<AnimationInstanceFactory>().map(AnimationInstanceFactory::create) else {
                panic!("a batch starts an animation of `HorizontalAlignmentRatio` without an animation instance");
            };
            host.set_animated_value(
                Self::id_of_horizontal_alignment_ratio_property().base(),
                ExpressionVariant::create(self.horizontal_alignment_ratio.get()),
                committed_at,
                animation,
            );
        } else if changed.contains(CompositionViewBoxChangedFields::HORIZONTAL_ALIGNMENT_RATIO) {
            let value = reader.read::<f32>();
            self.set_horizontal_alignment_ratio(host, value);
        }
        if changed.contains(CompositionViewBoxChangedFields::OFFSET_ANIMATED) {
            let Some(animation) = reader.read_value::<AnimationInstanceFactory>().map(AnimationInstanceFactory::create) else {
                panic!("a batch starts an animation of `Offset` without an animation instance");
            };
            host.set_animated_value(
                Self::id_of_offset_property().base(),
                ExpressionVariant::create(self.offset.get()),
                committed_at,
                animation,
            );
        } else if changed.contains(CompositionViewBoxChangedFields::OFFSET) {
            let value = reader.read::<Vector>();
            self.set_offset(host, value);
        }
        if changed.contains(CompositionViewBoxChangedFields::SIZE_ANIMATED) {
            let Some(animation) = reader.read_value::<AnimationInstanceFactory>().map(AnimationInstanceFactory::create) else {
                panic!("a batch starts an animation of `Size` without an animation instance");
            };
            host.set_animated_value(
                Self::id_of_size_property().base(),
                ExpressionVariant::create(self.size.get()),
                committed_at,
                animation,
            );
        } else if changed.contains(CompositionViewBoxChangedFields::SIZE) {
            let value = reader.read::<Vector>();
            self.set_size(host, value);
        }
        if changed.contains(CompositionViewBoxChangedFields::STRETCH) {
            let value = reader.read::<CompositionStretch>();
            self.set_stretch(host, value);
        }
        if changed.contains(CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO_ANIMATED) {
            let Some(animation) = reader.read_value::<AnimationInstanceFactory>().map(AnimationInstanceFactory::create) else {
                panic!("a batch starts an animation of `VerticalAlignmentRatio` without an animation instance");
            };
            host.set_animated_value(
                Self::id_of_vertical_alignment_ratio_property().base(),
                ExpressionVariant::create(self.vertical_alignment_ratio.get()),
                committed_at,
                animation,
            );
        } else if changed.contains(CompositionViewBoxChangedFields::VERTICAL_ALIGNMENT_RATIO) {
            let value = reader.read::<f32>();
            self.set_vertical_alignment_ratio(host, value);
        }
        ServerCompositionViewBoxHooks::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 == "HorizontalAlignmentRatio" {
            return Some(Self::id_of_horizontal_alignment_ratio_property().base());
        }
        if name == "Offset" {
            return Some(Self::id_of_offset_property().base());
        }
        if name == "Size" {
            return Some(Self::id_of_size_property().base());
        }
        if name == "VerticalAlignmentRatio" {
            return Some(Self::id_of_vertical_alignment_ratio_property().base());
        }
        None
    }
}