Extract plaform constants

lib/mobile/downloader.dart

@@ -6,12 +6,13 @@ import 'package:nc_photos/entity/file.dart';
 import 'package:nc_photos/exception.dart';
 import 'package:nc_photos/mobile/android/media_store.dart';
 import 'package:nc_photos/platform/downloader.dart' as itf;
+import 'package:nc_photos/platform/k.dart' as platform_k;
 import 'package:path/path.dart' as path;
 
 class Downloader extends itf.Downloader {
   @override
   downloadFile(Account account, File file) {
-    if (Platform.isAndroid) {
+    if (platform_k.isAndroid) {
       return _downloadFileAndroid(account, file);
     } else {
       throw UnimplementedError();

lib/platform/features.dart

@@ -1,5 +1,3 @@
-import 'dart:io';
+import 'package:nc_photos/platform/k.dart' as platform_k;
 
-import 'package:flutter/foundation.dart';
-
-final isSupportMapView = kIsWeb || Platform.isAndroid;
+final isSupportMapView = platform_k.isWeb || platform_k.isAndroid;

lib/platform/k.dart

@@ -0,0 +1,7 @@
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+
+const isWeb = kIsWeb;
+// Platform n/a on web, need checking kIsWeb first
+final isAndroid = !kIsWeb && Platform.isAndroid;

lib/widget/selectable_item_stream_list_mixin.dart

@@ -8,6 +8,7 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/k.dart' as k;
+import 'package:nc_photos/platform/k.dart' as platform_k;
 import 'package:nc_photos/session_storage.dart';
 import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/theme.dart';
@@ -37,7 +38,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget> on State<T> {
     BuildContext context, {
     @required Widget child,
   }) {
-    if (kIsWeb) {
+    if (platform_k.isWeb) {
       // support switching pages with keyboard on web
       return RawKeyboardListener(
         onKey: (ev) {
@@ -108,7 +109,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget> on State<T> {
       return _SelectableItemWidget(
         isSelected: _selectedItems.contains(item),
         onTap: () => _onItemTap(item, index),
-        onLongPress: isSelectionMode && kIsWeb
+        onLongPress: isSelectionMode && platform_k.isWeb
             ? null
             : () => _onItemLongPress(item, index),
         child: item.buildWidget(context),
@@ -159,7 +160,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget> on State<T> {
       return;
     }
     final wasSelectionMode = isSelectionMode;
-    if (!kIsWeb && wasSelectionMode && _lastSelectPosition != null) {
+    if (!platform_k.isWeb && wasSelectionMode && _lastSelectPosition != null) {
       setState(() {
         _selectedItems.addAll(_items
             .sublist(math.min(_lastSelectPosition, index),
@@ -178,7 +179,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget> on State<T> {
     if (!wasSelectionMode) {
       if (!SessionStorage().hasShowRangeSelectNotification) {
         SnackBarManager().showSnackBar(SnackBar(
-          content: Text(kIsWeb
+          content: Text(platform_k.isWeb
               ? AppLocalizations.of(context).webSelectRangeNotification
               : AppLocalizations.of(context).mobileSelectRangeNotification),
           duration: k.snackBarDurationNormal,

lib/widget/sign_in.dart

@@ -5,6 +5,7 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
 import 'package:nc_photos/list_extension.dart';
+import 'package:nc_photos/platform/k.dart' as platform_k;
 import 'package:nc_photos/pref.dart';
 import 'package:nc_photos/string_extension.dart';
 import 'package:nc_photos/theme.dart';
@@ -62,7 +63,7 @@ class _SignInState extends State<SignIn> {
                           child: _buildForm(context),
                         ),
                       ),
-                      if (!kIsWeb) Expanded(child: Container()),
+                      if (!platform_k.isWeb) Expanded(child: Container()),
                       Container(
                         constraints: const BoxConstraints(
                             maxWidth: AppTheme.widthLimitedContentMaxWidth),

lib/widget/viewer.dart

@@ -18,6 +18,7 @@ import 'package:nc_photos/exception_util.dart' as exception_util;
 import 'package:nc_photos/k.dart' as k;
 import 'package:nc_photos/mobile/platform.dart'
     if (dart.library.html) 'package:nc_photos/web/platform.dart' as platform;
+import 'package:nc_photos/platform/k.dart' as platform_k;
 import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/use_case/remove.dart';
@@ -78,14 +79,15 @@ class _ViewerState extends State<Viewer> with TickerProviderStateMixin {
     return AppTheme(
       child: Scaffold(
         body: Builder(
-            builder: (context) =>
-                kIsWeb ? _buildWebContent(context) : _buildContent(context)),
+            builder: (context) => platform_k.isWeb
+                ? _buildWebContent(context)
+                : _buildContent(context)),
       ),
     );
   }
 
   Widget _buildWebContent(BuildContext context) {
-    assert(kIsWeb);
+    assert(platform_k.isWeb);
     // support switching pages with keyboard on web
     return RawKeyboardListener(
       onKey: (ev) {
@@ -147,11 +149,11 @@ class _ViewerState extends State<Viewer> with TickerProviderStateMixin {
               controller: _pageController,
               itemCount: widget.streamFiles.length,
               itemBuilder: _buildPage,
-              physics: !kIsWeb && _canSwitchPage()
+              physics: !platform_k.isWeb && _canSwitchPage()
                   ? null
                   : const NeverScrollableScrollPhysics(),
             ),
-            if (kIsWeb) ..._buildNavigationButtons(context),
+            if (platform_k.isWeb) ..._buildNavigationButtons(context),
             _buildBottomAppBar(context),
             _buildAppBar(context),
           ],
@@ -793,7 +795,7 @@ class _ViewerState extends State<Viewer> with TickerProviderStateMixin {
   /// Update the navigation state for [page]
   void _updateNavigationState(int page) {
     // currently useless to run on non-web platform
-    if (!kIsWeb) {
+    if (!platform_k.isWeb) {
       return;
     }
     final hasNext = page < widget.streamFiles.length - 1;

lib/widget/viewer_detail_pane.dart

@@ -19,6 +19,7 @@ import 'package:nc_photos/k.dart' as k;
 import 'package:nc_photos/mobile/platform.dart'
     if (dart.library.html) 'package:nc_photos/web/platform.dart' as platform;
 import 'package:nc_photos/platform/features.dart' as features;
+import 'package:nc_photos/platform/k.dart' as platform_k;
 import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/use_case/remove.dart';
@@ -242,7 +243,7 @@ class _ViewerDetailPaneState extends State<ViewerDetailPane> {
   }
 
   void _onMapTap() {
-    if (Platform.isAndroid) {
+    if (platform_k.isAndroid) {
       final intent = AndroidIntent(
         action: "action_view",
         data: Uri.encodeFull("geo:${_gps.item1},${_gps.item2}?z=16"),