class FocusChain
Defined at line 41 of file fidling/gen/sdk/fidl/fuchsia.ui.focus/fuchsia.ui.focus/cpp/fidl/fuchsia.ui.focus/cpp/natural_types.h
A FocusChain tracks the status of the View hierarchy as View focus changes.
Reception. Only certain components may receive a FocusChain, as it
captures global information about the scene graph.
Public Methods
void FocusChain (Storage_ storage)void FocusChain ()Defined at line 47 of file fidling/gen/sdk/fidl/fuchsia.ui.focus/fuchsia.ui.focus/cpp/fidl/fuchsia.ui.focus/cpp/natural_types.h
void FocusChain (FocusChain && )Defined at line 48 of file fidling/gen/sdk/fidl/fuchsia.ui.focus/fuchsia.ui.focus/cpp/fidl/fuchsia.ui.focus/cpp/natural_types.h
bool IsEmpty ()const std::optional< ::std::vector< ::fuchsia_ui_views::ViewRef>> & focus_chain ()The `focus_chain` is reported in order of dominance in the View
hierarchy; each adjacent pair of elements represents a
parent-child relationship.
The `focus_chain` MAY be unset when `FocusChain` message is received, if
the message is sent very early in the scene setup, before the first
view is available.
When `focus_chain` is set, however, the root View is always present
and occupies slot 0 in the `focus_chain`. The newly-focused View
receives a `fuchsia.ui.input.FocusEvent` and occupies the final slot
in the vector.
If a View gets destroyed, a `FocusChain` holder that listens will
receive a `ZX_EVENTPAIR_PEER_CLOSED` signal on the corresponding
`ViewRef`.
## Invalidation.
A FocusChain is invalid if any one if its ViewRefs is
invalid.
::std::optional< ::std::vector< ::fuchsia_ui_views::ViewRef>> & focus_chain ()The `focus_chain` is reported in order of dominance in the View
hierarchy; each adjacent pair of elements represents a
parent-child relationship.
The `focus_chain` MAY be unset when `FocusChain` message is received, if
the message is sent very early in the scene setup, before the first
view is available.
When `focus_chain` is set, however, the root View is always present
and occupies slot 0 in the `focus_chain`. The newly-focused View
receives a `fuchsia.ui.input.FocusEvent` and occupies the final slot
in the vector.
If a View gets destroyed, a `FocusChain` holder that listens will
receive a `ZX_EVENTPAIR_PEER_CLOSED` signal on the corresponding
`ViewRef`.
## Invalidation.
A FocusChain is invalid if any one if its ViewRefs is
invalid.
FocusChain & focus_chain (std::optional< ::std::vector< ::fuchsia_ui_views::ViewRef>> value)The `focus_chain` is reported in order of dominance in the View
hierarchy; each adjacent pair of elements represents a
parent-child relationship.
The `focus_chain` MAY be unset when `FocusChain` message is received, if
the message is sent very early in the scene setup, before the first
view is available.
When `focus_chain` is set, however, the root View is always present
and occupies slot 0 in the `focus_chain`. The newly-focused View
receives a `fuchsia.ui.input.FocusEvent` and occupies the final slot
in the vector.
If a View gets destroyed, a `FocusChain` holder that listens will
receive a `ZX_EVENTPAIR_PEER_CLOSED` signal on the corresponding
`ViewRef`.
## Invalidation.
A FocusChain is invalid if any one if its ViewRefs is
invalid.
void FocusChain (::fidl::internal::DefaultConstructPossiblyInvalidObjectTag )FocusChain & operator= (FocusChain && )Defined at line 49 of file fidling/gen/sdk/fidl/fuchsia.ui.focus/fuchsia.ui.focus/cpp/fidl/fuchsia.ui.focus/cpp/natural_types.h
Friends
class MemberVisitorclass NaturalTableCodingTraits