Add view all device photos option for iOS

lib/db/files_db.dart

@@ -556,6 +556,27 @@ class FilesDB {
     return FileLoadResult(files, files.length == limit);
   }
 
+  Future<FileLoadResult> getLocalDeviceFiles(
+    int startTime,
+    int endTime, {
+    int limit,
+    bool asc,
+  }) async {
+    final db = await instance.database;
+    final order = (asc ?? false ? 'ASC' : 'DESC');
+    final results = await db.query(
+      table,
+      where:
+          '$columnCreationTime >= ? AND $columnCreationTime <= ? AND $columnLocalID IS NOT NULL',
+      whereArgs: [startTime, endTime],
+      orderBy:
+          '$columnCreationTime ' + order + ', $columnModificationTime ' + order,
+      limit: limit,
+    );
+    final files = _convertToFiles(results);
+    return FileLoadResult(files, files.length == limit);
+  }
+
   Future<List<File>> getAllVideos() async {
     final db = await instance.database;
     final results = await db.query(

lib/models/gallery_type.dart

@@ -3,6 +3,7 @@ enum GalleryType {
   archive,
   trash,
   localFolder,
+  localAll, // used for gallery view displaying all local photos on the device
   // indicator for gallery view of collections shared with the user
   sharedCollection,
   ownedCollection,

lib/ui/collections_gallery_widget.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:io';
 import 'dart:math';
 
 import 'package:flutter/material.dart';
@@ -22,6 +23,7 @@ import 'package:photos/ui/common/loading_widget.dart';
 import 'package:photos/ui/viewer/file/thumbnail_widget.dart';
 import 'package:photos/ui/viewer/gallery/archive_page.dart';
 import 'package:photos/ui/viewer/gallery/collection_page.dart';
+import 'package:photos/ui/viewer/gallery/device_all_page.dart';
 import 'package:photos/ui/viewer/gallery/device_folder_page.dart';
 import 'package:photos/ui/viewer/gallery/empte_state.dart';
 import 'package:photos/ui/viewer/gallery/trash_page.dart';
@@ -150,7 +152,22 @@ class _CollectionsGalleryWidgetState extends State<CollectionsGalleryWidget>
         child: Column(
           children: [
             const SizedBox(height: 12),
-            const SectionTitle("On device"),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              crossAxisAlignment: CrossAxisAlignment.end,
+              children: [
+                const SectionTitle("On device"),
+                Platform.isAndroid
+                    ? const SizedBox.shrink()
+                    : GestureDetector(
+                        child: const Padding(
+                          padding: EdgeInsets.only(right: 12.0),
+                          child: Text("View all"),
+                        ),
+                        onTap: () => routeToPage(context, DeviceAllPage()),
+                      ),
+              ],
+            ),
             const SizedBox(height: 12),
             items.folders.isEmpty
                 ? const Padding(

lib/ui/viewer/gallery/device_all_page.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+import 'package:photos/core/event_bus.dart';
+import 'package:photos/db/files_db.dart';
+import 'package:photos/events/files_updated_event.dart';
+import 'package:photos/events/local_photos_updated_event.dart';
+import 'package:photos/models/gallery_type.dart';
+import 'package:photos/models/selected_files.dart';
+import 'package:photos/ui/viewer/gallery/gallery.dart';
+import 'package:photos/ui/viewer/gallery/gallery_app_bar_widget.dart';
+import 'package:photos/ui/viewer/gallery/gallery_overlay_widget.dart';
+
+// This page is used to display all photos which are present on the local device
+class DeviceAllPage extends StatelessWidget {
+  final _selectedFiles = SelectedFiles();
+
+  DeviceAllPage({Key key}) : super(key: key);
+
+  @override
+  Widget build(Object context) {
+    final gallery = Gallery(
+      asyncLoader: (creationStartTime, creationEndTime, {limit, asc}) {
+        return FilesDB.instance.getLocalDeviceFiles(
+          creationStartTime,
+          creationEndTime,
+          limit: limit,
+          asc: asc,
+        );
+      },
+      reloadEvent: Bus.instance.on<LocalPhotosUpdatedEvent>(),
+      removalEventTypes: const {
+        EventType.deletedFromDevice,
+        EventType.deletedFromEverywhere,
+      },
+      tagPrefix: "device_all",
+      selectedFiles: _selectedFiles,
+      initialFiles: null,
+      footer: const SizedBox(height: 32),
+    );
+    return Scaffold(
+      appBar: PreferredSize(
+        preferredSize: const Size.fromHeight(50.0),
+        child: GalleryAppBarWidget(
+          GalleryType.localAll,
+          "All photos",
+          _selectedFiles,
+        ),
+      ),
+      body: Stack(
+        alignment: Alignment.bottomCenter,
+        children: [
+          gallery,
+          GalleryOverlayWidget(
+            GalleryType.localFolder,
+            _selectedFiles,
+          )
+        ],
+      ),
+    );
+  }
+}

lib/ui/viewer/gallery/gallery_overlay_widget.dart

@@ -265,7 +265,8 @@ class _OverlayWidgetState extends State<OverlayWidget> {
       String msg = "Add";
       IconData iconData = Platform.isAndroid ? Icons.add : CupertinoIcons.add;
       // show upload icon instead of add for files selected in local gallery
-      if (widget.type == GalleryType.localFolder) {
+      if (widget.type == GalleryType.localFolder ||
+          widget.type == GalleryType.localAll) {
         msg = "Upload";
         iconData = Platform.isAndroid
             ? Icons.cloud_upload
@@ -319,7 +320,8 @@ class _OverlayWidgetState extends State<OverlayWidget> {
     );
     if (widget.type == GalleryType.homepage ||
         widget.type == GalleryType.archive ||
-        widget.type == GalleryType.localFolder) {
+        widget.type == GalleryType.localFolder ||
+        widget.type == GalleryType.localAll) {
       actions.add(
         Tooltip(
           message: "Delete",