class Provider
Defined at line 129 of file fidling/gen/sdk/fidl/fuchsia.accessibility.scene/fuchsia.accessibility.scene/hlcpp/fuchsia/accessibility/scene/cpp/fidl.h
Public Members
static const char[] Name_Public Methods
void ~Provider ()void CreateView (::fuchsia::ui::views::ViewCreationToken a11y_view_token, ::fuchsia::ui::views::ViewportCreationToken proxy_viewport_token)Prompts the server (a11y manager) to create a new accessibility `View`,
which the client (scene manager) must connect to the root of the scene
graph.
The accessibility view is used to vend capabilities to a11y manager
that a view confers, e.g. ability to request focus, consume and
respond to input events, annotate underlying views, and apply
coordinate transforms to its subtree.
With the a11y view, the scene topology is roughly:
scene root (owned by scene manager)
|
a11y viewport (owned by scene manager)
|
a11y view (owned by a11y manager)
|
proxy viewport (owned by a11y manager)
|
proxy view (owned by scene manager)
|
client viewport (owned by scene manager)
|
client view (owned by UI client)
ARGS
a11y_view_token: Token generated by scene manager, which a11y manager
uses to create the a11y view in its flatland instance.
proxy_viewport_token: Token generated by scene manager, which a11y manager
uses to create a "proxy viewport" within the a11y view. The client must
subsequently create a "proxy view" using the corresponding view creation
token it generated.
SYNCHRONIZATION
Callers may safely proceed once the accessibility `ViewRef` is returned
to the accessibility `ViewPort` holder.
LIFECYCLE
The client is free to close the channel any time after calling CreateView().
EPITAPH
This method may return the following epitaphs:
- ZX_ERR_INVALID_ARGS, if either of the provided tokens is invalid.
- ZX_ERR_PEER_CLOSED, if Scenic fails creating the accessibility `Viewport`.