Struct PanZoomController 

pub struct PanZoomController { /* private fields */ }

A cloneable handle onto a PanZoomView: drive it with jump_to/fit_to_bounds/ fit_rect and read where it stands with transform. Every clone shares one state, so the handle an app keeps in its state and the one attached to the view are the same.

Commands are recorded, not applied: the widget applies the latest one at its next layout or paint (a later command replaces an unapplied earlier one), clamping the scale to the view’s bounds. One controller drives one view; attaching it to two makes them race for its commands.

Implementations

impl PanZoomController

pub fn new() -> Self

A controller attached to nothing yet, reading PanZoomTransform::IDENTITY.

pub fn transform(&self) -> PanZoomTransform

The transform the attached widget last published (identity until one attaches and lays out).

pub fn viewport_size(&self) -> Size

The attached widget’s last laid-out size (zero until it lays out).

pub fn content_size(&self) -> Size

The child’s last laid-out natural size (zero until it lays out).

pub fn jump_to(&self, scale: f64, offset: Vec2)

Move to scale (clamped to the view’s bounds) with the child’s origin at view-local offset.

pub fn fit_to_bounds(&self)

Fit the child’s whole laid-out bounds into the view, centred, at the largest scale that shows all of it (clamped to the view’s bounds).

pub fn fit_rect(&self, rect: Rect)

Fit rect, in the child’s content space, into the view, centred, at the largest scale that shows all of it (clamped to the view’s bounds).

Trait Implementations

impl Clone for PanZoomController

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PanZoomController

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

Formats the value using the given formatter.

impl Default for PanZoomController

fn default() -> Self

Returns the “default value” for a type.