PROTOCOLS
Buttons
Defined in fuchsia.buttons/buttons.fidl
Protocol for other devices to get the state of buttons and register for notifications of state change.
GetState
Gets the state of the button requested.
type : Button type.
@Returns: pressed : True if button is pressed.
Request
| Name | Type |
|---|---|
type |
ButtonType
|
Response
| Name | Type |
|---|---|
pressed |
bool
|
RegisterNotify
Registers to receive notifications of a state change for some buttons.
types : Bitmask which indicates the interested buttons. 0 means not
interested, 1 means interested. Bit position corresponds to
ButtonType, e.g. (1 << VOLUME_UP) means notify only when
the state of the VOLUME_UP button changes. Types not listed
in subsequent calls are removed.
@Returns: status : ZX_OK if succeeds.
Request
| Name | Type |
|---|---|
types |
uint8
|
Response
| Name | Type |
|---|---|
result |
Buttons_RegisterNotify_Result
|
OnNotify
Notify event. Called when state of previously registered button changes.
type : Button type.
pressed : True if button is pressed.
Response
| Name | Type |
|---|---|
type |
ButtonType
|
pressed |
bool
|
STRUCTS
Buttons_RegisterNotify_Response
Defined in fuchsia.buttons/buttons.fidl
| Name | Type | Description | Default |
|---|
ENUMS
ButtonType
Type: uint8
Defined in fuchsia.buttons/buttons.fidl
ButtonType should the same as BUTTONS_ID_... in metadata/buttons.h
| Name | Value | Description |
|---|---|---|
VOLUME_UP |
0 |
|
VOLUME_DOWN |
1 |
|
RESET |
2 |
|
MUTE |
3 |
|
MAX |
4 |
UNIONS
Buttons_RegisterNotify_Result
Defined in fuchsia.buttons/buttons.fidl
| Name | Type | Description |
|---|---|---|
response |
Buttons_RegisterNotify_Response
|
|
err |
zx/status
|