Initial radio implementation

Notable changes:
- Add radio gRPC API protobuf definitation and generated files.
- Reworked existing single gRPC APIs library to split it into
  per-API libraries to avoid name collision issues.
- Add radio gRPC client class and associated radio state class
  and RiverPod providers.
- Split media controls and play list table classes into media
  player and radio specific versions to facilitate customization
  and wiring up their appropriate backends in a straightforward
  fashion.  Some potential rationalization of styling widgets
  may be done as a follow up to avoid some duplication.
- Added radio configuration and presets loading.  The presets
  will be populated with the contents of a radio-presets.yaml
  file from the configured location, the default location is
  the /etc/xdg/AGL/ics-homescreen directory.
- Implemented FM radio player against the radio gRPC API.
  For the sake of expediency, no attempt has been made to make
  the player able to handle AM band support.
- Reworked media page navigation state so that active player is
  restored when coming back to the page.  Logic has been added to
  start/stop the radio on navigating to or leaving the FM radio
  sub-page.  This will potentially be reworked before CES to work
  with the pause/stop button present on the other pages.
- Started pruning down global exports.dart a bit to remove files
  only used in a specific page/hierarchy, starting with media.

Bug-AGL: SPEC-5029

Change-Id: I1ae0aca4a7a8218e69e4286c863f01509a1cccb7
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/data/data_providers/radio_notifier.dart b/lib/data/data_providers/radio_notifier.dart
new file mode 100644
index 0000000..90e0df5
--- /dev/null
+++ b/lib/data/data_providers/radio_notifier.dart
@@ -0,0 +1,31 @@
+import 'package:flutter_ics_homescreen/export.dart';
+
+class RadioStateNotifier extends Notifier<RadioState> {
+  @override
+  RadioState build() {
+    return RadioState.initial();
+  }
+
+  void updateBandParameters(
+      {required int freqMin, required freqMax, required freqStep}) {
+    state =
+        state.copyWith(freqMin: freqMin, freqMax: freqMax, freqStep: freqStep);
+  }
+
+  void updateFrequency(int frequency) {
+    state = state.copyWith(freqCurrent: frequency);
+  }
+
+  void setFrequency(int frequency) {
+    state = state.copyWith(freqCurrent: frequency);
+    ref.read(radioClientProvider).setFrequency(frequency);
+  }
+
+  void updatePlaying(bool playing) {
+    state = state.copyWith(playing: playing);
+  }
+
+  void updateScanning(bool scanning) {
+    state = state.copyWith(scanning: scanning);
+  }
+}