Struct ScrollGeometry 

pub struct ScrollGeometry {
    pub rect: Rect,
    pub content: Size,
    pub offset: Vec2,
    pub max_offset: Vec2,
}

What the last layout resolved for a scroll container: where the container landed, how big its content came out, and the offset it clamped. All logical px, in the same viewport coordinates on_layout reports.

This is the geometry a view needs to build only the rows that can be seen — it is read during the next frame’s build, so it describes the frame before. See Core::scroll_geometry for what that costs and widgets::uniform_list for the uniform-row case done for you.

The four numbers describe one moment, which is what makes arithmetic on them safe: offset is always within max_offset, even immediately after a set_scroll wrote something wilder (the documented “a huge value jumps to the end” would otherwise hand a view an index a million rows past its data).

Fields

rect: Rect

The container’s own box, as the last layout placed and sized it — the same rect an on_layout on that node would have reported.

content: Size

Its laid-out content, padding included. Bigger than rect on an axis exactly when that axis has somewhere left to scroll.

offset: Vec2

Where the container is scrolled to (positive = content moved up / left): the retained offset clamped to max_offset, which is what the next layout will resolve it to unless the content changes size in the same frame. Core::scroll_offset is the unclamped retained number.

max_offset: Vec2

How far offset can travel on each axis — zero on an axis that does not scroll, or whose content fits. offset == max_offset is “at the end”, which is how a log view asks whether it is still tailing.

Implementations

impl ScrollGeometry

pub fn to_value(&self) -> Value

{x, y, w, h, content_w, content_h, offset: {x, y}, max_offset: {x, y}} — the box’s rect flattened, its content’s size beside it.

Trait Implementations

impl Clone for ScrollGeometry

fn clone(&self) -> ScrollGeometry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScrollGeometry

impl Debug for ScrollGeometry

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

Formats the value using the given formatter.

impl PartialEq for ScrollGeometry

fn eq(&self, other: &ScrollGeometry) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScrollGeometry