Merge pull request #510 from Guillergood/125-jump-to-letter

Jump to Letter when scrolling, closes #125

lib/components/MusicScreen/alphabet_item_list.dart

@@ -0,0 +1,71 @@
+import 'package:finamp/models/jellyfin_models.dart';
+import 'package:flutter/material.dart';
+
+class AlphabetList extends StatefulWidget {
+  final Function(String) callback;
+
+  final String sortOrder;
+
+  const AlphabetList({super.key, required this.callback, required this.sortOrder});
+
+  @override
+  State<AlphabetList> createState() => _AlphabetListState();
+}
+
+class _AlphabetListState extends State<AlphabetList> {
+  List<String> alphabet = ['#'] +
+      List.generate(26, (int index) {
+        return String.fromCharCode('A'.codeUnitAt(0) + index);
+      });
+
+
+  List<String> get getAlphabet => alphabet;
+
+  @override
+  void initState() {
+    orderTheList(alphabet);
+    super.initState();
+  }
+
+
+  @override
+  void didUpdateWidget(AlphabetList oldWidget) {
+    orderTheList(alphabet);
+    super.didUpdateWidget(oldWidget);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Align(
+      alignment: Alignment.centerRight,
+      child: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 2),
+        child: SingleChildScrollView(
+          child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: List.generate(
+                alphabet.length,
+                (x) => InkWell(
+                  onTap: () {
+                    widget.callback(alphabet[x]);
+                  },
+                  child: Container(
+                    padding:
+                        const EdgeInsets.symmetric(horizontal: 10, vertical: 2),
+                    child: Text(
+                      alphabet[x].toUpperCase(),
+                    ),
+                  ),
+                ),
+              )),
+        ),
+      ),
+    );
+  }
+
+  void orderTheList(List<String> list) {
+    widget.sortOrder == "Ascending"
+        ? list.sort()
+        : list.sort((a, b) => b.compareTo(a));
+  }
+}