class Watch
Defined at line 69 of file fidling/gen/sdk/fidl/fuchsia.ui.observation.geometry/fuchsia.ui.observation.geometry/cpp/fidl/fuchsia.ui.observation.geometry/cpp/markers.h
A method of obtaining view tree snapshots for a particular view.
This call is formulated as a "hanging get" pattern: the client asks for
a set of recent snapshots, and receives them via the callback. This
pull-based approach ensures that clients consume events at their own
pace; events don't clog up the channel in an unbounded manner.
Error Handling. If Error is unset, the client may assume that the
the response contains updates with complete information over its epoch.
Flow control. The caller is allowed at most one in-flight |Watch| call
at a time; it is a logical error to have concurrent calls to |Watch|.
Non-compliance results in channel closure.
Client pacing. The server will dispatch snapshots to the caller on a
lossless, best-effort basis, but the caller must allocate enough time to
keep up with new snapshots.
Public Members
static const bool kHasClientToServerstatic const bool kHasClientToServerBodystatic const bool kHasServerToClientstatic const bool kHasServerToClientBodystatic const bool kHasNonEmptyUserFacingResponsestatic const bool kHasDomainErrorstatic const bool kHasFrameworkErrorstatic const uint64_t kOrdinal