Add volume control to bottom panel

Changes:
- Import a reworked version of the KUKSA.val client code from the
  Flutter dashboard app, with the aggregated signal Riverpod provider
  replaced with per-signal providers for the signal the homescreen
  needs and a couple of temperature ones it might use.  Using separate
  providers is more in-line with recommended Riverpod best practices.
- Various tweaks to enable using Riverpod.
- Split the bottom panel out into its own widget, and add a stack in
  it to layer the default logo panel with the volume control slider,
  which has been added as a new widget definition to provide the hook
  to drive timer based lowering behavior like the Qt homescreen does.
- The KUKSA.val connection widget has been added to the bottom panel
  rather than overriding the top-level widget as in the dashboard and
  HVAC apps.  This seems preferable with respect to still providing
  some functionality in the event KUKSA.val is unavailable.
- Remove the old demo dashboard and HVAC pages that are now unused,
  along with the image assets they needed, to allow cleaning up
  pubspec.yaml and ease maintenance.

Bug-AGL: SPEC-4659

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5d9180a3461948a58321564e71134c4961ce0ef7

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/volume_slider.dart b/lib/volume_slider.dart
new file mode 100644
index 0000000..0665491
--- /dev/null
+++ b/lib/volume_slider.dart
@@ -0,0 +1,50 @@
+import 'dart:io';
+import 'package:async/async.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_homescreen/vehicle-signals/vss_providers.dart';
+import 'package:flutter_homescreen/vehicle-signals/vss_path.dart';
+import 'package:flutter_homescreen/vehicle-signals/viss_methods.dart';
+
+class VolumeSlider extends ConsumerWidget {
+  final Color thumbColor;
+  final Color activeColor;
+  final Color inactiveColor;
+  final RestartableTimer? activityTimer;
+
+  VolumeSlider(
+      {Key? key,
+      required this.thumbColor,
+      required this.activeColor,
+      required this.inactiveColor,
+      required this.activityTimer})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final signal = ref.watch(vehicleSignalMediaVolumeProvider);
+    return Slider(
+        thumbColor: thumbColor,
+        activeColor: activeColor,
+        inactiveColor: inactiveColor,
+        value: signal.volume.toDouble(),
+        max: 100,
+        label: "Volume",
+        onChangeStart: (value) {
+          activityTimer?.cancel();
+        },
+        onChangeEnd: (value) {
+          activityTimer?.reset();
+        },
+        onChanged: (value) {
+          ref
+              .read(vehicleSignalMediaVolumeProvider.notifier)
+              .update(volume: value.toInt());
+          WebSocket? s = ref.read(VISServerSocketProvider).socket;
+          if (s != null) {
+            VISS.set(
+                s, ref, VSSPath.vehicleMediaVolume, value.toInt().toString());
+          }
+        });
+  }
+}