Module host_surface 

The surface the host gives the application, and what the application may ask of it.

On the web that is the canvas inside its page; on desktop the window’s client area; on mobile the activity’s content view. An application that wants to lay out against it — or, on a host that allows it, ask for a different size — reads observable state here instead of reaching for a platform API and a resize callback of its own.

Structs

HostSurfaceObserver

Keeps a host-surface observer registered until it is dropped.

HostSurfaceSize

The size of the host surface, in logical pixels, with the scale the host renders it at.

Enums

ResizeRefused

Why a resize request was refused.

Traits

HostSurface

What an application may ask of the host’s surface.

Functions

clear_platform_host_surface

Removes the installed host surface (tests and teardown).

host_surface

The installed host surface, or one that accepts no resize requests.

host_surface_can_resize

Whether this host lets the application choose its surface size.

host_surface_size

The size the host last reported.

observe_host_surface_size

Registers observer for host-surface size changes. Applications collect rememberHostSurfaceSize instead of calling this.

publish_host_surface_size

Publishes a new host-surface size. Platform backends call this whenever the host resizes the surface.

rememberHostSurfaceSize

The host surface’s size, observed for as long as this call stays in the composition.

request_host_surface_size

Asks the host for a different surface size.

set_platform_host_surface

Installs the platform host surface.

Type Aliases

HostSurfaceRef

Shared handle to a HostSurface.