Struct ScrollbarState

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pub struct ScrollbarState {
    pub visible: bool,
    pub orientation: ScrollbarOrientation,
    pub base_size: f32,
    pub scale: LogicalPosition,
    pub thumb_position_ratio: f32,
    pub thumb_size_ratio: f32,
    pub track_rect: LogicalRect,
    pub button_size: f32,
    pub usable_track_length: f32,
    pub thumb_length: f32,
    pub thumb_offset: f32,
}

Expand description

Scrollbar geometry state (calculated per frame, used for hit-testing and rendering)

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§visible: bool

Is this scrollbar visible? (content larger than container)

§orientation: ScrollbarOrientation

Orientation

§base_size: f32

Base size (1:1 square, width = height). This is the unscaled size.

§scale: LogicalPosition

Scale transform to apply (calculated from container size)

§thumb_position_ratio: f32

Thumb position ratio (0.0 = top/left, 1.0 = bottom/right)

§thumb_size_ratio: f32

Thumb size ratio (0.0 = invisible, 1.0 = entire track)

§track_rect: LogicalRect

Position of the scrollbar in the container (for hit-testing)

§button_size: f32

Button size (square: button_size × button_size)

§usable_track_length: f32

Usable track length after subtracting buttons

§thumb_length: f32

Thumb length in pixels

§thumb_offset: f32

Thumb offset from start of usable track region

Implementations§

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impl ScrollbarState

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pub fn hit_test_component( &self, local_pos: LogicalPosition, ) -> ScrollbarComponent

Determine which component was hit at the given local position (relative to track_rect origin). Uses the shared geometry values (button_size, usable_track_length, thumb_length, thumb_offset) for consistent hit-testing.

Trait Implementations§

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impl Clone for ScrollbarState

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fn clone(&self) -> ScrollbarState

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for ScrollbarState

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl UnwindSafe for ScrollbarState

Blanket 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> 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
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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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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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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