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, 41 insertions, 0 deletions

diff --git a/lib/vehicle-signals/viss_connection_widget.dart b/lib/vehicle-signals/viss_connection_widget.dart
new file mode 100644
index 0000000..a2abee7
--- /dev/null
+++ b/lib/vehicle-signals/viss_connection_widget.dart
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: Apache-2.0
+import 'dart:io';
+import 'package:flutter_homescreen/vehicle-signals/viss_config.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'viss_connected_widget.dart';
+
+class VISServerConnectionWidget extends ConsumerWidget {
+  VISServerConnectionWidget({Key? key, required this.client}) : super(key: key);
+  final HttpClient client;
+  late WebSocket socket;
+
+  @override
+  Widget build(BuildContext context, ref) {
+    final sockConnect = ref.watch(sockConnectprovider(client));
+
+    return sockConnect.when(
+        data: (socket) {
+          this.socket = socket;
+          this.socket.pingInterval = const Duration(seconds: 2);
+          return VISServerConnectedWidget(client: client, socket: this.socket);
+        },
+        error: (e, stk) {
+          print(e);
+          ref.refresh(sockConnectprovider(client));
+          return Container(
+              child: const Text('Connection Error',
+                  style: TextStyle(
+                      fontSize: 20,
+                      fontWeight: FontWeight.bold,
+                      color: Colors.white)));
+        },
+        loading: () => Container(
+            child: Text('Connected',
+                style: TextStyle(
+                    fontSize: 20,
+                    fontWeight: FontWeight.bold,
+                    color: Colors.white))));
+  }
+}