PROTOCOLS
DeviceListenerRegistry
Defined in fuchsia.ui.policy/device_listener.fidl
Service for exposing state and events of devices, such as media buttons.
RegisterListener
Registers a listener to receive media button related events, such as
changes from volume buttons and mute switches.
On registration, the listener receives the last media button event that
occurred, if one exists, and all media button events going forward.
Request
| Name | Type |
|---|---|
listener |
client_end:MediaButtonsListener
|
Response
<EMPTY>
RegisterMediaButtonsListener
Registers a listener to receive media button related events, such as changes from volume buttons and mute switches.
DEPRECATED - Use RegisterListener()
Request
| Name | Type |
|---|---|
listener |
client_end:MediaButtonsListener
|
DisplayBacklight
Defined in fuchsia.ui.policy/display_backlight.fidl
Manipulates global policy for display backlight. Serves as the main "front end" interface for usage by UX components; other protocols (such as fuchsia.ui.scenic.Session and fuchsia.hardware.display.Controller) act as implementation.
Global Scope. All displays, in all display controllers, are affected uniformly.
Effect Timing. This protocol does not guarantee a deadline by which the minimum value is applied to a display; it is best effort.
Multiple clients. This protocol does not guarantee unique access to manipulate display backlight functionality.
Reference. Related to fuchsia.hardware.display.Controller.
SetMinimumRgb
Submits a new minimum color channel value for display backlight.
The valid range for a minimum value is [0, 255] (inclusive). For a new minimum value M, each color channel's range will be limited to [M, 255].
Flow control: The caller is allowed at most one in-flight |SetMinimumRgb| at at time. Subsequent calls must wait until the acknowledgment returns. Non-compliance results in channel closure.
Request
| Name | Type |
|---|---|
minimum_rgb |
uint8
|
Response
<EMPTY>
MediaButtonsListener
Defined in fuchsia.ui.policy/device_listener.fidl
A listener for media buttons events. DeviceListenerRegistry.RegisterMediaButtonsListener
will consume this listener interface and call OnMediaButtonsEvent when the
registered media buttons event occurs.
OnEvent
Request
| Name | Type |
|---|---|
event |
fuchsia.ui.input/MediaButtonsEvent
|
Response
<EMPTY>
OnMediaButtonsEvent
DEPRECATED - Use OnEvent()
Request
| Name | Type |
|---|---|
event |
fuchsia.ui.input/MediaButtonsEvent
|