Struct InteractiveViewer 

pub struct InteractiveViewer<W: Widget + Send + Sync + 'static> {
    pub child: W,
    /* private fields */
}

A large 2D plane with pan + zoom, driven by wheel/drag and +/- controls (Flutter-InteractiveViewer-like, Phase 32/D115).

Built on the same GPU-composited transform-layer seam ScrollView uses (D087/D090): the child is recorded ONCE into an independent Picture and replayed by the platform into its own content texture, so panning is a zero-repaint UV shift. Zoom rasterizes that SAME picture at a higher physical resolution (content_scale = dpi_scale * zoom in rosace/src/engine.rs) — real GPU-crisp magnification, reusing the exact mechanism that already gives HiDPI displays sharp text/shapes; the compositor’s existing UV-window math needs no changes.

Pinch/trackpad-magnify gesture support is a NAMED deferral (mirrors the project’s existing “mobile pinch deferred” pattern for Phase 28 Step 6): this MVP drives zoom through explicit +/- controls, which needs no new platform-level gesture plumbing.

Fields

child: W

Implementations

impl<W: Widget + Send + Sync + 'static> InteractiveViewer<W>

pub fn new(child: W) -> Self

pub fn min_scale(self, v: f32) -> Self

pub fn max_scale(self, v: f32) -> Self

pub fn unconstrained(self) -> Self

Unbounded infinite-plane panning instead of the default clamped-to-content behavior.

pub fn no_zoom_controls(self) -> Self

Trait Implementations

impl<W: Widget + Send + Sync + 'static> Widget for InteractiveViewer<W>

fn layout(&self, ctx: &LayoutCtx<'_>) -> Size

Measure under ctx.constraints and return a size within them.

fn paint(&self, ctx: &mut PaintCtx<'_>)

Record draw commands for ctx.rect.

fn children(&self) -> Children<'_>

Declare this widget’s children. Drives every default below.

fn flex_factor(&self) -> f32

Flex weight inside Row/Column. Wrappers are transparent by default.

fn into_element(self) -> Element

where Self: Sized + 'static,

Wrap this widget in an Element so it can be returned from Component::build().