Struct PlatformViewHosting 

pub struct PlatformViewHosting<A> { /* private fields */ }

The bookkeeping a platform layer needs while it hosts native views, kept apart from the native calls so attach, reposition, restack and detach sequencing can be tested without a window.

A carries whatever the platform layer captured at attach time and must put back verbatim at detach: on Windows the child window’s parent, window styles and window region.

Implementations

impl<A> PlatformViewHosting<A>

pub fn is_empty(&self) -> bool

Returns true while no view is hosted.

pub fn contains(&self, id: PlatformViewId) -> bool

Returns whether the given view is hosted.

pub fn attach(&mut self, id: PlatformViewId, attributes: A)

Records a view as hosted, stacked above every view hosted so far.

Attaching a view that is already hosted replaces what has to be restored for it and forgets its applied frame, so the next placement is applied unconditionally.

pub fn detach(&mut self, id: PlatformViewId) -> Option<A>

Forgets a hosted view, returning what the platform layer must restore.

pub fn detach_all(&mut self) -> Vec<(PlatformViewId, A)>

Forgets every hosted view, bottom-most first.

pub fn restack(&mut self, order: &[PlatformViewId]) -> bool

Adopts order — bottom-most first — as the stacking order, returning true when it differs from the order last applied and the platform layer therefore has to restack.

Ids that are not hosted are ignored, and hosted views the frame did not mention keep their relative order beneath the ordered ones.

pub fn place( &mut self, id: PlatformViewId, bounds: Bounds<Pixels>, scale_factor: f32, ) -> Option<Bounds<DevicePixels>>

Records the frame a hosted view was laid out at, returning the physical rectangle to move it to, or None when it already sits there.

pub fn attributes(&self, id: PlatformViewId) -> Option<&A>

Returns what the platform layer must restore for a hosted view.

pub fn ids(&self) -> Vec<PlatformViewId>

Returns the hosted views in the stacking order last applied, bottom-most first.

Trait Implementations

impl<A> Default for PlatformViewHosting<A>

fn default() -> Self

Returns the “default value” for a type.