poc: sticky headers

lib/common/outlined_text.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+class OutlinedText extends StatelessWidget {
+  final String data;
+  final TextStyle style;
+  final double outlineWidth;
+  final Color outlineColor;
+
+  OutlinedText(
+    this.data, {
+    this.style,
+    @required this.outlineWidth,
+    @required this.outlineColor,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: [
+        Text(
+          data,
+          style: style.copyWith(
+            foreground: Paint()
+              ..style = PaintingStyle.stroke
+              ..strokeWidth = outlineWidth
+              ..color = outlineColor,
+          ),
+        ),
+        Text(
+          data,
+          style: style,
+        ),
+      ],
+    );
+  }
+}

lib/image_fetcher.dart

@@ -6,10 +6,10 @@ import 'package:flutter/services.dart';
 class ImageFetcher {
   static const platform = const MethodChannel('deckers.thibault.aves/mediastore');
 
-  static Future<List> getImageEntries() async {
+  static Future<List<Map>> getImageEntries() async {
     try {
       final result = await platform.invokeMethod('getImageEntries');
-      return result as List;
+      return (result as List).cast<Map>();
     } on PlatformException catch (e) {
       debugPrint('failed with exception=${e.message}');
     }

lib/main.dart

@@ -1,6 +1,5 @@
 import 'package:aves/image_fetcher.dart';
-import 'package:aves/thumbnail.dart';
-import 'package:draggable_scrollbar/draggable_scrollbar.dart';
+import 'package:aves/thumbnail_collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
@@ -12,84 +11,51 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Flutter Demo',
+      title: 'Aves',
       theme: ThemeData(
         brightness: Brightness.dark,
         primarySwatch: Colors.blue,
       ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
+      home: HomePage(title: 'Home'),
     );
   }
 }
 
-class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+class HomePage extends StatefulWidget {
+  HomePage({Key key, this.title}) : super(key: key);
 
   final String title;
 
   @override
-  _MyHomePageState createState() => _MyHomePageState();
+  _HomePageState createState() => _HomePageState();
 }
 
-class _MyHomePageState extends State<MyHomePage> {
-  Future<List> imageLoader;
-  ScrollController scrollController = ScrollController();
+class _HomePageState extends State<HomePage> {
+  List<Map> imageEntryList;
 
   @override
   void initState() {
     super.initState();
     imageCache.maximumSizeBytes = 100 * 1024 * 1024;
+    getImageEntries();
+  }
+
+  getImageEntries() async {
+    imageEntryList = await ImageFetcher.getImageEntries();
+    setState(() {});
   }
 
   @override
   Widget build(BuildContext context) {
-    if (imageLoader == null) {
-      imageLoader = ImageFetcher.getImageEntries();
-    }
-    var columnCount = 4;
-    var extent = MediaQuery.of(context).size.width / columnCount;
     return Scaffold(
       appBar: AppBar(
         title: Text(widget.title),
       ),
-      body: FutureBuilder(
-          future: imageLoader,
-          builder: (futureContext, AsyncSnapshot<List> snapshot) {
-            switch (snapshot.connectionState) {
-              case ConnectionState.none:
-                return Text('None');
-              case ConnectionState.active:
-              case ConnectionState.waiting:
-                return Text('Awaiting result...');
-              case ConnectionState.done:
-                if (snapshot.hasError) return Text('Error: ${snapshot.error}');
-                var imageEntryList = snapshot.data;
-                return Container(
-                  padding: EdgeInsets.symmetric(vertical: 0.0),
-                  child: DraggableScrollbar.arrows(
-                    labelTextBuilder: (double offset) => Text(
-                      "${offset ~/ 1}",
-                      style: TextStyle(color: Colors.blueGrey),
-                    ),
-                    controller: scrollController,
-                    child: GridView.builder(
-                      controller: scrollController,
-                      gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
-                        maxCrossAxisExtent: extent,
-                      ),
-                      itemBuilder: (gridContext, index) {
-                        return Thumbnail(
-                          entry: imageEntryList[index] as Map,
-                          extent: extent,
-                        );
-                      },
-                      itemCount: imageEntryList.length,
-                    ),
-                  ),
-                );
-            }
-            return null;
-          }),
+      body: imageEntryList == null
+          ? Center(
+              child: CircularProgressIndicator(),
+            )
+          : ThumbnailCollection(imageEntryList),
     );
   }
 }

lib/thumbnail.dart

@@ -3,7 +3,7 @@ import 'dart:typed_data';
 
 import 'package:aves/image_fetcher.dart';
 import 'package:aves/image_fullscreen_page.dart';
-import 'package:aves/mime_types.dart';
+import 'package:aves/model/mime_types.dart';
 import 'package:flutter/material.dart';
 import 'package:transparent_image/transparent_image.dart';
 

lib/thumbnail_collection.dart

@@ -0,0 +1,104 @@
+import 'package:aves/common/outlined_text.dart';
+import 'package:aves/thumbnail.dart';
+import "package:collection/collection.dart";
+import 'package:draggable_scrollbar/draggable_scrollbar.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_sticky_header/flutter_sticky_header.dart';
+import 'package:intl/intl.dart';
+
+class ThumbnailCollection extends StatelessWidget {
+  final Map<String, List<Map>> sections;
+  final ScrollController scrollController = ScrollController();
+
+  ThumbnailCollection(List<Map> entries) : sections = groupBy(entries, getDayTaken);
+
+  static DateTime getBestDate(Map entry) {
+    var dateTakenMillis = entry['sourceDateTakenMillis'] as int;
+    if (dateTakenMillis != null && dateTakenMillis > 0) return DateTime.fromMillisecondsSinceEpoch(dateTakenMillis);
+
+    var dateModifiedSecs = entry['dateModifiedSecs'] as int;
+    if (dateModifiedSecs != null && dateModifiedSecs > 0) return DateTime.fromMillisecondsSinceEpoch(dateModifiedSecs * 1000);
+
+    return null;
+  }
+
+  static DateFormat sectionDateFormat = DateFormat('yyyy/MM/dd');
+
+  static String getDayTaken(Map entry) {
+    var date = getBestDate(entry);
+    return date == null ? 'Unknown' : sectionDateFormat.format(date);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    var columnCount = 4;
+    var extent = MediaQuery.of(context).size.width / columnCount;
+
+    return CustomScrollView(
+      slivers: sections.keys
+          .map((sectionKey) => SliverStickyHeader(
+                header: SectionHeader(sectionKey),
+                sliver: SliverGrid(
+                  delegate: SliverChildBuilderDelegate(
+                    (context, index) {
+                      var entries = sections[sectionKey];
+                      if (index >= entries.length) return null;
+                      return Thumbnail(
+                        entry: entries[index],
+                        extent: extent,
+                      );
+                    },
+                    childCount: sections[sectionKey].length,
+                  ),
+                  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
+                    crossAxisCount: columnCount,
+                  ),
+                ),
+              ))
+          .toList(),
+    );
+
+//    return DraggableScrollbar.arrows(
+//      labelTextBuilder: (double offset) => Text(
+//        "${offset ~/ 1}",
+//        style: TextStyle(color: Colors.blueGrey),
+//      ),
+//      controller: scrollController,
+//      child: GridView.builder(
+//        controller: scrollController,
+//        gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
+//          maxCrossAxisExtent: extent,
+//        ),
+//        itemBuilder: (gridContext, index) {
+//          return Thumbnail(
+//            entry: imageEntryList[index],
+//            extent: extent,
+//          );
+//        },
+//        itemCount: imageEntryList.length,
+//      ),
+//    );
+  }
+}
+
+class SectionHeader extends StatelessWidget {
+  final String primaryText;
+
+  SectionHeader(this.primaryText);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: EdgeInsets.all(16),
+      child: OutlinedText(
+        primaryText,
+        style: TextStyle(
+          color: Colors.white,
+          fontSize: 20,
+        ),
+        outlineColor: Colors.black87,
+        outlineWidth: 2,
+      ),
+    );
+  }
+}

pubspec.lock

@@ -23,7 +23,7 @@ packages:
     source: hosted
     version: "1.1.2"
   collection:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: collection
       url: "https://pub.dartlang.org"
@@ -41,11 +41,25 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_sticky_header:
+    dependency: "direct main"
+    description:
+      name: flutter_sticky_header
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.15.8"
   matcher:
     dependency: transitive
     description:
@@ -151,3 +165,4 @@ packages:
     version: "2.0.8"
 sdks:
   dart: ">=2.2.2 <3.0.0"
+  flutter: ">=1.5.9-pre.94 <2.0.0"

pubspec.yaml

@@ -19,7 +19,10 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  collection:
   draggable_scrollbar:
+  flutter_sticky_header:
+  intl:
   transparent_image:
 
 dev_dependencies: