keyEvent constant Null safety
A JSON BasicMessageChannel for keyboard events.
Each incoming message received on this channel (registered using
BasicMessageChannel.setMessageHandler) consists of a Map with
platform-specific data, plus a type field which is either keydown, or
keyup.
On Android, the available fields are those described by RawKeyEventDataAndroid's properties.
On Fuchsia, the available fields are those described by RawKeyEventDataFuchsia's properties.
No messages are sent on other platforms currently.
See also:
- RawKeyboard, which uses this channel to expose key data.
- RawKeyEvent.fromMessage, which can decode this data into the RawKeyEvent subclasses mentioned above.
Implementation
static const BasicMessageChannel<Object?> keyEvent = BasicMessageChannel<Object?>(
'flutter/keyevent',
JSONMessageCodec(),
);