ScrollPosition

Struct ScrollPosition 

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pub struct ScrollPosition(pub Vec2);
Expand description

The scroll position of the node. Values are in logical pixels, increasing from top-left to bottom-right.

Increasing the x-coordinate causes the scrolled content to visibly move left on the screen, while increasing the y-coordinate causes the scrolled content to move up. This might seem backwards, however what’s really happening is that the scroll position is moving the visible “window” in the local coordinate system of the scrolled content - moving the window down causes the content to move up.

Updating the values of ScrollPosition will reposition the children of the node by the offset amount in logical pixels. ScrollPosition may be updated by the layout system when a layout change makes a previously valid ScrollPosition invalid. Changing this does nothing on a Node without setting at least one OverflowAxis to OverflowAxis::Scroll.

Tuple Fields§

§0: Vec2

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Methods from Deref<Target = Vec2>§

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pub const ZERO: Vec2

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pub const ONE: Vec2

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pub const NEG_ONE: Vec2

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pub const MIN: Vec2

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pub const MAX: Vec2

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pub const NAN: Vec2

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pub const INFINITY: Vec2

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pub const NEG_INFINITY: Vec2

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pub const X: Vec2

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pub const Y: Vec2

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pub const NEG_X: Vec2

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pub const NEG_Y: Vec2

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pub const AXES: [Vec2; 2]

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pub const USES_CORE_SIMD: bool = false

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pub const USES_NEON: bool = false

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pub const USES_SCALAR_MATH: bool = true

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pub const USES_SSE2: bool = false

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pub const USES_WASM32_SIMD: bool = false

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pub fn to_array(&self) -> [f32; 2]

Converts self to [x, y]

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pub fn move_towards(&self, rhs: Vec2, d: f32) -> Vec2

Moves towards rhs based on the value d.

When d is 0.0, the result will be equal to self. When d is equal to self.distance(rhs), the result will be equal to rhs. Will not go past rhs.

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pub fn rotate_towards(&self, rhs: Vec2, max_angle: f32) -> Vec2

Rotates towards rhs up to max_angle (in radians).

When max_angle is 0.0, the result will be equal to self. When max_angle is equal to self.angle_between(rhs), the result will be parallel to rhs. If max_angle is negative, rotates towards the exact opposite of rhs. Will not go past the target.

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pub fn as_dvec2(&self) -> DVec2

Casts all elements of self to f64.

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pub fn as_i8vec2(&self) -> I8Vec2

Casts all elements of self to i8.

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pub fn as_u8vec2(&self) -> U8Vec2

Casts all elements of self to u8.

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pub fn as_i16vec2(&self) -> I16Vec2

Casts all elements of self to i16.

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pub fn as_u16vec2(&self) -> U16Vec2

Casts all elements of self to u16.

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pub fn as_ivec2(&self) -> IVec2

Casts all elements of self to i32.

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pub fn as_uvec2(&self) -> UVec2

Casts all elements of self to u32.

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pub fn as_i64vec2(&self) -> I64Vec2

Casts all elements of self to i64.

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pub fn as_u64vec2(&self) -> U64Vec2

Casts all elements of self to u64.

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pub fn as_usizevec2(&self) -> USizeVec2

Casts all elements of self to usize.

Trait Implementations§

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impl Clone for ScrollPosition

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fn clone(&self) -> ScrollPosition

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Component for ScrollPosition
where ScrollPosition: Send + Sync + 'static,

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const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table

A constant indicating the storage type used for this component.
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type Mutability = Mutable

A marker type to assist Bevy with determining if this component is mutable, or immutable. Mutable components will have Component<Mutability = Mutable>, while immutable components will instead have Component<Mutability = Immutable>. Read more
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fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )

Registers required components. Read more
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fn clone_behavior() -> ComponentCloneBehavior

Called when registering this component, allowing to override clone function (or disable cloning altogether) for this component. Read more
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fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_add ComponentHook for this Component if one is defined.
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fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_insert ComponentHook for this Component if one is defined.
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fn on_replace() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_replace ComponentHook for this Component if one is defined.
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fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_remove ComponentHook for this Component if one is defined.
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fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_despawn ComponentHook for this Component if one is defined.
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fn map_entities<E>(_this: &mut Self, _mapper: &mut E)
where E: EntityMapper,

Maps the entities on this component using the given EntityMapper. This is used to remap entities in contexts like scenes and entity cloning. When deriving Component, this is populated by annotating fields containing entities with #[entities] Read more
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impl Debug for ScrollPosition

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for ScrollPosition

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fn default() -> ScrollPosition

Returns the “default value” for a type. Read more
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impl Deref for ScrollPosition

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type Target = Vec2

The resulting type after dereferencing.
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fn deref(&self) -> &<ScrollPosition as Deref>::Target

Dereferences the value.
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impl DerefMut for ScrollPosition

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fn deref_mut(&mut self) -> &mut <ScrollPosition as Deref>::Target

Mutably dereferences the value.
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impl From<Vec2> for ScrollPosition

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fn from(value: Vec2) -> ScrollPosition

Converts to this type from the input type.
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impl FromReflect for ScrollPosition

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fn from_reflect( reflect: &(dyn PartialReflect + 'static), ) -> Option<ScrollPosition>

Constructs a concrete instance of Self from a reflected value.
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fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails. Read more
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impl GetTypeRegistration for ScrollPosition

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fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.
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fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type. Read more
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impl PartialReflect for ScrollPosition

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fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value. Read more
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fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value. Read more
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fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type. Read more
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fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type. Read more
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fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type. Read more
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fn reflect_owned(self: Box<ScrollPosition>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type. Read more
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fn try_into_reflect( self: Box<ScrollPosition>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.
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fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.
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fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.
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fn into_partial_reflect(self: Box<ScrollPosition>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value. Read more
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fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value. Read more
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fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value. Read more
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fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result. Read more
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fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection. Read more
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fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value. Read more
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fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind. Read more
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fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>
where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails. Read more
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fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type). Read more
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fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value. Read more
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fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type. Read more
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impl Reflect for ScrollPosition

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fn into_any(self: Box<ScrollPosition>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>. Read more
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fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any. Read more
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any. Read more
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fn into_reflect(self: Box<ScrollPosition>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.
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fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.
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fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.
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fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value. Read more
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impl TupleStruct for ScrollPosition

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fn field(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn Reflect.
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fn field_mut( &mut self, index: usize, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.
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fn field_len(&self) -> usize

Returns the number of fields in the tuple struct.
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fn iter_fields(&self) -> TupleStructFieldIter<'_>

Returns an iterator over the values of the tuple struct’s fields.
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fn to_dynamic_tuple_struct(&self) -> DynamicTupleStruct

Creates a new DynamicTupleStruct from this tuple struct.
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fn get_represented_tuple_struct_info(&self) -> Option<&'static TupleStructInfo>

Will return None if TypeInfo is not available.
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impl TypePath for ScrollPosition

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fn type_path() -> &'static str

Returns the fully qualified path of the underlying type. Read more
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fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type. Read more
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fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous. Read more
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fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous. Read more
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fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous. Read more
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impl Typed for ScrollPosition

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fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<C> Bundle for C
where C: Component,

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fn component_ids( components: &mut ComponentsRegistrator<'_>, ids: &mut impl FnMut(ComponentId), )

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fn get_component_ids( components: &Components, ids: &mut impl FnMut(Option<ComponentId>), )

Gets this Bundle’s component ids. This will be None if the component has not been registered.
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impl<C> BundleFromComponents for C
where C: Component,

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unsafe fn from_components<T, F>(ctx: &mut T, func: &mut F) -> C
where F: for<'a> FnMut(&'a mut T) -> OwningPtr<'a>,

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impl<T> CloneToUninit for T
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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Converts &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<C> DynamicBundle for C
where C: Component,

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type Effect = ()

An operation on the entity that happens after inserting this bundle.
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unsafe fn get_components( ptr: MovingPtr<'_, C>, func: &mut impl FnMut(StorageType, OwningPtr<'_>), ) -> <C as DynamicBundle>::Effect

Moves the components out of the bundle. Read more
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unsafe fn apply_effect( _ptr: MovingPtr<'_, MaybeUninit<C>>, _entity: &mut EntityWorldMut<'_>, )

Applies the after-effects of spawning this bundle. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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fn from_world(_world: &mut World) -> T

Creates Self using default().

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