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lib/core/entity/entities_base.dart

@@ -1,13 +1,22 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
+import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
 import 'package:intl/intl.dart';
 import 'package:thingsboard_app/core/context/tb_context.dart';
+import 'package:thingsboard_app/core/context/tb_context_widget.dart';
 import 'package:thingsboard_client/thingsboard_client.dart';
 
-typedef EntityDetailsFunction<T extends BaseData> = Function(T entity);
-typedef EntityCardWidgetBuilder<T extends BaseData> = Widget Function(BuildContext context, T entity, bool briefView);
+typedef EntityTapFunction<T> = Function(T entity);
+typedef EntityCardWidgetBuilder<T> = Widget Function(BuildContext context, T entity);
 
-mixin EntitiesBase<T extends BaseData> on HasTbContext {
+class EntityCardSettings {
+  bool dropShadow;
+  EntityCardSettings({this.dropShadow = true});
+}
+
+mixin EntitiesBase<T, P> on HasTbContext {
 
   final entityDateFormat = DateFormat('yyyy-MM-dd');
 
@@ -15,75 +24,255 @@ mixin EntitiesBase<T extends BaseData> on HasTbContext {
 
   String get noItemsFoundText;
 
-  Future<PageData<T>> fetchEntities(PageLink pageLink);
+  Future<PageData<T>> fetchEntities(P pageKey);
 
-  Widget buildEntityCard(BuildContext context, T entity, bool briefView);
+  Future<void> onRefresh() => Future.value();
 
-  void onEntityDetails(T entity);
+  Widget? buildHeading(BuildContext context) => null;
+
+  Widget buildEntityListCard(BuildContext context, T entity) {
+    return Text('Not implemented!');
+  }
+
+  Widget buildEntityListWidgetCard(BuildContext context, T entity) {
+    return Text('Not implemented!');
+  }
+
+  Widget buildEntityGridCard(BuildContext context, T entity) {
+    return Text('Not implemented!');
+  }
+
+  P createFirstKey({int pageSize = 10}) => throw UnimplementedError('Not implemented');
+
+  P nextPageKey(P pageKey) => throw UnimplementedError('Not implemented');
+
+  EntityCardSettings entityListCardSettings(T entity) => EntityCardSettings();
+
+  EntityCardSettings entityGridCardSettings(T entity) => EntityCardSettings();
+
+  void onEntityTap(T entity);
 
 }
 
-class EntityCard<T extends BaseData> extends StatelessWidget {
-  final bool _briefView;
-  final T _entity;
-  final EntityDetailsFunction<T>? _onDetails;
-  final EntityCardWidgetBuilder<T> _entityCardWidgetBuilder;
+mixin EntitiesBaseWithPageLink<T> on EntitiesBase<T, PageLink> {
 
-  EntityCard(T entity, {EntityDetailsFunction<T>? onDetails,
-                        required EntityCardWidgetBuilder<T> entityCardWidgetBuilder,
-                        required bool briefView}):
-        this._entity = entity,
-        this._onDetails = onDetails,
-        this._entityCardWidgetBuilder = entityCardWidgetBuilder,
-        this._briefView = briefView;
+  @override
+  PageLink createFirstKey({int pageSize = 10}) => PageLink(pageSize, 0, null, SortOrder('createdTime', Direction.DESC));
+
+  @override
+  PageLink nextPageKey(PageLink pageKey) => pageKey.nextPageLink();
+
+}
+
+mixin EntitiesBaseWithTimePageLink<T> on EntitiesBase<T, TimePageLink> {
+
+  @override
+  TimePageLink createFirstKey({int pageSize = 10}) => TimePageLink(pageSize, 0, null, SortOrder('createdTime', Direction.DESC));
+
+  @override
+  TimePageLink nextPageKey(TimePageLink pageKey) => pageKey.nextPageLink();
+
+}
+
+abstract class BaseEntitiesPageLinkWidget<T> extends BaseEntitiesWidget<T, PageLink> with EntitiesBaseWithPageLink<T> {
+  BaseEntitiesPageLinkWidget(TbContext tbContext): super(tbContext);
+}
+
+abstract class BaseEntitiesTimePageLinkWidget<T> extends BaseEntitiesWidget<T, TimePageLink> with EntitiesBaseWithTimePageLink<T> {
+  BaseEntitiesTimePageLinkWidget(TbContext tbContext): super(tbContext);
+}
+
+abstract class BaseEntitiesWidget<T, P> extends TbContextWidget<BaseEntitiesWidget<T, P>, BaseEntitiesState<T, P>> with EntitiesBase<T, P> {
+
+  BaseEntitiesWidget(TbContext tbContext): super(tbContext);
+
+}
+
+abstract class BaseEntitiesState<T, P> extends TbContextState<BaseEntitiesWidget<T, P>, BaseEntitiesState<T, P>> {
+
+  late final PagingController<P, T> pagingController;
+  Completer<void>? _refreshCompleter;
+
+  @override
+  void initState() {
+    super.initState();
+    pagingController = PagingController(firstPageKey: widget.createFirstKey());
+    pagingController.addPageRequestListener((pageKey) {
+      _fetchPage(pageKey);
+    });
+  }
+
+  @override
+  void dispose() {
+    pagingController.dispose();
+    super.dispose();
+  }
+
+  bool _dataLoading = false;
+  bool _scheduleRefresh = false;
+
+  Future<void> _refresh() {
+    if (_refreshCompleter == null) {
+      _refreshCompleter = Completer();
+    }
+    if (_dataLoading) {
+      _scheduleRefresh = true;
+    } else {
+      _refreshPagingController();
+    }
+    return _refreshCompleter!.future;
+  }
+
+  void _refreshPagingController() {
+    _fetchPage(widget.createFirstKey(), refresh: true);
+  }
+
+  Future<void> _fetchPage(P pageKey, {bool refresh = false}) async {
+    if (mounted) {
+      _dataLoading = true;
+      try {
+        hideNotification();
+        final pageData = await widget.fetchEntities(pageKey);
+        final isLastPage = !pageData.hasNext;
+        if (refresh) {
+          var state = pagingController.value;
+          if (state.itemList != null) {
+            state.itemList!.clear();
+          }
+        }
+        if (isLastPage) {
+          pagingController.appendLastPage(pageData.data);
+        } else {
+          final nextPageKey = widget.nextPageKey(pageKey);
+          pagingController.appendPage(pageData.data, nextPageKey);
+        }
+      } catch (error) {
+        if (mounted) {
+          pagingController.error = error;
+        }
+      } finally {
+        _dataLoading = false;
+        if (refresh) {
+          _refreshCompleter!.complete();
+          _refreshCompleter = null;
+        }
+        if (_scheduleRefresh) {
+          _scheduleRefresh = false;
+          if (mounted) {
+            _refreshPagingController();
+          }
+        }
+      }
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
-    return
-      GestureDetector(
-          behavior: HitTestBehavior.opaque,
-          child:
-          Container(
-            height: 64,
-            margin: _briefView ? EdgeInsets.only(right: 8) : EdgeInsets.symmetric(vertical: 4, horizontal: 8),
-            child: Card(
-                margin: EdgeInsets.zero,
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(_briefView ? 4 : 6),
-                ),
-                elevation: 0,
-                child: Padding(
-                    padding: const EdgeInsets.all(2),
-                    child: _entityCardWidgetBuilder(context, _entity, _briefView)
-                )
+    return RefreshIndicator(
+        onRefresh: () => Future.wait([
+          widget.onRefresh(),
+          _refresh()
+        ]),
+        child: pagedViewBuilder(context)
+    );
+  }
+  
+  Widget pagedViewBuilder(BuildContext context);
+
+  Widget firstPageProgressIndicatorBuilder(BuildContext context) {
+    return Stack( children: [
+      Positioned(
+        top: 20,
+        left: 0,
+        right: 0,
+        child: Row(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [RefreshProgressIndicator()],
+        ),
+      )
+    ]);
+  }
+  
+  Widget newPageProgressIndicatorBuilder(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.only(
+        top: 16,
+        bottom: 16,
+      ),
+      child: Center(child: RefreshProgressIndicator()),
+    );
+  }
+  
+  Widget noItemsFoundIndicatorBuilder(BuildContext context) {
+    return FirstPageExceptionIndicator(
+      title: widget.noItemsFoundText,
+      message: 'The list is currently empty.',
+      onTryAgain: () => pagingController.refresh(),
+    );
+  }
+
+}
+
+class FirstPageExceptionIndicator extends StatelessWidget {
+  const FirstPageExceptionIndicator({
+    required this.title,
+    this.message,
+    this.onTryAgain,
+    Key? key,
+  }) : super(key: key);
+
+  final String title;
+  final String? message;
+  final VoidCallback? onTryAgain;
+
+  @override
+  Widget build(BuildContext context) {
+    final message = this.message;
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(vertical: 32, horizontal: 16),
+        child: Column(
+          children: [
+            Text(
+              title,
+              textAlign: TextAlign.center,
+              style: Theme.of(context).textTheme.headline6,
             ),
-            decoration: _briefView ? BoxDecoration(
-                border: Border.all(
-                    color: Color(0xFFDEDEDE),
-                    style: BorderStyle.solid,
-                    width: 1
+            if (message != null)
+              const SizedBox(
+                height: 16,
+              ),
+            if (message != null)
+              Text(
+                message,
+                textAlign: TextAlign.center,
+              ),
+            if (onTryAgain != null)
+              const SizedBox(
+                height: 48,
+              ),
+            if (onTryAgain != null)
+              SizedBox(
+                height: 50,
+                width: double.infinity,
+                child: ElevatedButton.icon(
+                  onPressed: onTryAgain,
+                  icon: const Icon(
+                    Icons.refresh,
+                    color: Colors.white,
+                  ),
+                  label: const Text(
+                    'Try Again',
+                    style: TextStyle(
+                      fontSize: 16,
+                      color: Colors.white,
+                    ),
+                  ),
                 ),
-                borderRadius: BorderRadius.circular(4)
-              ) : BoxDecoration(
-              boxShadow: [
-                BoxShadow(
-                    color: Colors.black.withAlpha(25),
-                    blurRadius: 10.0,
-                    offset: Offset(0, 4)
-                ),
-                BoxShadow(
-                    color: Colors.black.withAlpha(18),
-                    blurRadius: 30.0,
-                    offset: Offset(0, 10)
-                ),
-              ],
-            ),
-          ),
-          onTap: () {
-            if (_onDetails != null) {
-              _onDetails!(_entity);
-            }
-          }
-      );
+              ),
+          ],
+        ),
+      ),
+    );
   }
 }

lib/core/entity/entities_grid.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
+
+import 'entities_base.dart';
+import 'entity_grid_card.dart';
+
+mixin EntitiesGridStateBase on StatefulWidget {
+
+  @override
+  _EntitiesGridState createState() => _EntitiesGridState();
+
+}
+
+class _EntitiesGridState<T, P> extends BaseEntitiesState<T, P> {
+
+  @override
+  Widget pagedViewBuilder(BuildContext context) {
+    var heading = widget.buildHeading(context);
+    List<Widget> slivers = [];
+    if (heading != null) {
+      slivers.add(SliverPadding(
+          padding: EdgeInsets.fromLTRB(16, 16, 16, 0),
+          sliver: SliverToBoxAdapter(
+              child: heading
+          )));
+    }
+    slivers.add(SliverPadding(
+        padding: EdgeInsets.all(16),
+        sliver: PagedSliverGrid(
+            showNewPageProgressIndicatorAsGridChild: false,
+            showNewPageErrorIndicatorAsGridChild: false,
+            showNoMoreItemsIndicatorAsGridChild: false,
+            pagingController: pagingController,
+            // padding: EdgeInsets.all(16),
+            gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+              childAspectRatio: 156 / 150,
+              crossAxisSpacing: 16,
+              mainAxisSpacing: 16,
+              crossAxisCount: 2,
+            ),
+            builderDelegate: PagedChildBuilderDelegate<T>(
+                itemBuilder: (context, item, index) => EntityGridCard<T>(
+                  item,
+                  entityCardWidgetBuilder: widget.buildEntityGridCard,
+                  onEntityTap: widget.onEntityTap,
+                  settings: widget.entityGridCardSettings(item),
+                ),
+                firstPageProgressIndicatorBuilder: firstPageProgressIndicatorBuilder,
+                newPageProgressIndicatorBuilder: newPageProgressIndicatorBuilder,
+                noItemsFoundIndicatorBuilder: noItemsFoundIndicatorBuilder
+            )
+        )));
+    return CustomScrollView(
+      slivers: slivers
+    );
+  }
+}

lib/core/entity/entities_list.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
+import 'package:thingsboard_app/core/entity/entities_base.dart';
+
+import 'entity_list_card.dart';
+
+mixin EntitiesListStateBase on StatefulWidget {
+
+  @override
+  _EntitiesListState createState() => _EntitiesListState();
+
+}
+
+class _EntitiesListState<T,P> extends BaseEntitiesState<T, P> {
+
+  @override
+  Widget pagedViewBuilder(BuildContext context) {
+    var heading = widget.buildHeading(context);
+    List<Widget> slivers = [];
+    if (heading != null) {
+      slivers.add(SliverPadding(
+          padding: EdgeInsets.fromLTRB(16, 16, 16, 0),
+          sliver: SliverToBoxAdapter(
+              child: heading
+          )));
+    }
+    slivers.add(SliverPadding(
+        padding: EdgeInsets.all(16),
+        sliver: PagedSliverList.separated(
+            pagingController: pagingController,
+            separatorBuilder: (context, index) => SizedBox(height: 8),
+            builderDelegate: PagedChildBuilderDelegate<T>(
+                itemBuilder: (context, item, index) => EntityListCard<T>(
+                  item,
+                  entityCardWidgetBuilder: widget.buildEntityListCard,
+                  onEntityTap: widget.onEntityTap,
+                  settings: widget.entityListCardSettings(item),
+                ),
+                firstPageProgressIndicatorBuilder: firstPageProgressIndicatorBuilder,
+                newPageProgressIndicatorBuilder: newPageProgressIndicatorBuilder,
+                noItemsFoundIndicatorBuilder: noItemsFoundIndicatorBuilder
+            )
+        )));
+    return CustomScrollView(
+        slivers: slivers
+    );
+  }
+}

lib/core/entity/entities_list_widget.dart

@@ -3,22 +3,23 @@ import 'dart:async';
 import 'package:fading_edge_scrollview/fading_edge_scrollview.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
-import 'package:intl/intl.dart';
 import 'package:thingsboard_app/core/context/tb_context.dart';
 import 'package:thingsboard_app/core/context/tb_context_widget.dart';
 import 'package:thingsboard_app/core/entity/entities_base.dart';
 import 'package:thingsboard_client/thingsboard_client.dart';
 
-class EntitiesWidgetController {
+import 'entity_list_card.dart';
 
-  final List<_EntitiesWidgetState> states = [];
+class EntitiesListWidgetController {
 
-  void _registerEntitiesWidgetState(_EntitiesWidgetState entitiesWidgetState) {
-    states.add(entitiesWidgetState);
+  final List<_EntitiesListWidgetState> states = [];
+
+  void _registerEntitiesWidgetState(_EntitiesListWidgetState entitiesListWidgetState) {
+    states.add(entitiesListWidgetState);
   }
 
-  void _unregisterEntitiesWidgetState(_EntitiesWidgetState entitiesWidgetState) {
-    states.remove(entitiesWidgetState);
+  void _unregisterEntitiesWidgetState(_EntitiesListWidgetState entitiesListWidgetState) {
+    states.remove(entitiesListWidgetState);
   }
 
   Future<void> refresh() {
@@ -31,29 +32,32 @@ class EntitiesWidgetController {
 
 }
 
-abstract class EntitiesWidget<T extends BaseData> extends TbContextWidget<EntitiesWidget<T>, _EntitiesWidgetState<T>> with EntitiesBase<T> {
+abstract class EntitiesListPageLinkWidget<T> extends EntitiesListWidget<T, PageLink> with EntitiesBaseWithPageLink<T> {
+  EntitiesListPageLinkWidget(TbContext tbContext, {EntitiesListWidgetController? controller}): super(tbContext, controller: controller);
+}
 
-  final entityDateFormat = DateFormat('yyyy-MM-dd');
-  final EntitiesWidgetController? _controller;
+abstract class EntitiesListWidget<T, P> extends TbContextWidget<EntitiesListWidget<T,P>, _EntitiesListWidgetState<T,P>> with EntitiesBase<T,P> {
 
-  EntitiesWidget(TbContext tbContext, {EntitiesWidgetController? controller}):
+  final EntitiesListWidgetController? _controller;
+
+  EntitiesListWidget(TbContext tbContext, {EntitiesListWidgetController? controller}):
       _controller = controller,
       super(tbContext);
 
   @override
-  _EntitiesWidgetState createState() => _EntitiesWidgetState(_controller);
+  _EntitiesListWidgetState createState() => _EntitiesListWidgetState(_controller);
 
   void onViewAll();
 
 }
 
-class _EntitiesWidgetState<T extends BaseData> extends TbContextState<EntitiesWidget<T>, _EntitiesWidgetState<T>> {
+class _EntitiesListWidgetState<T,P> extends TbContextState<EntitiesListWidget<T,P>, _EntitiesListWidgetState<T,P>> {
 
-  final EntitiesWidgetController? _controller;
+  final EntitiesListWidgetController? _controller;
 
   final StreamController<PageData<T>?> _entitiesStreamController = StreamController.broadcast();
 
-  _EntitiesWidgetState(EntitiesWidgetController? controller):
+  _EntitiesListWidgetState(EntitiesListWidgetController? controller):
      _controller = controller;
 
   @override
@@ -76,7 +80,7 @@ class _EntitiesWidgetState<T extends BaseData> extends TbContextState<EntitiesWi
 
   Future<void> _refresh() {
     _entitiesStreamController.add(null);
-    var entitiesFuture = widget.fetchEntities(PageLink(5, 0, null, SortOrder('createdTime', Direction.DESC)));
+    var entitiesFuture = widget.fetchEntities(widget.createFirstKey(pageSize: 5));
     entitiesFuture.then((value) => _entitiesStreamController.add(value));
     return entitiesFuture;
   }
@@ -204,11 +208,12 @@ class _EntitiesWidgetState<T extends BaseData> extends TbContextState<EntitiesWi
         child: ListView(
             scrollDirection: Axis.horizontal,
             controller: ScrollController(),
-            children: entities.map((entity) => EntityCard<T>(
+            children: entities.map((entity) => EntityListCard<T>(
                 entity,
-                entityCardWidgetBuilder: widget.buildEntityCard,
-                onDetails: widget.onEntityDetails,
-                briefView: true
+                entityCardWidgetBuilder: widget.buildEntityListWidgetCard,
+                onEntityTap: widget.onEntityTap,
+                settings: widget.entityListCardSettings(entity),
+                listWidgetCard: true
             )).toList()
     ));
   }

lib/core/entity/entities_page.dart

@@ -1,220 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
-import 'package:thingsboard_app/core/context/tb_context.dart';
-import 'package:thingsboard_app/core/context/tb_context_widget.dart';
-import 'package:thingsboard_app/core/entity/entities_base.dart';
-import 'package:thingsboard_app/widgets/tb_app_bar.dart';
-import 'package:thingsboard_client/thingsboard_client.dart';
-
-abstract class EntitiesPage<T extends BaseData> extends TbContextWidget<EntitiesPage<T>, _EntitiesPageState<T>> with EntitiesBase<T> {
-
-  EntitiesPage(TbContext tbContext): super(tbContext);
-
-  String get searchHint;
-
-  String get noMoreItemsText;
-
-  @override
-  _EntitiesPageState createState() => _EntitiesPageState();
-
-}
-
-class _EntitiesPageState<T extends BaseData> extends TbContextState<EntitiesPage<T>, _EntitiesPageState<T>> {
-
-  final _searchModeNotifier = ValueNotifier<bool>(false);
-
-  final PagingController<PageLink, T> _pagingController = PagingController(firstPageKey: PageLink(10, 0, null, SortOrder('createdTime', Direction.DESC)));
-
-  @override
-  void initState() {
-    super.initState();
-    _pagingController.addPageRequestListener((pageKey) {
-      _fetchPage(pageKey);
-    });
-  }
-
-  @override
-  void dispose() {
-    _pagingController.dispose();
-    super.dispose();
-  }
-
-  bool _dataLoading = false;
-  bool _scheduleRefresh = false;
-
-  void _refresh() {
-    if (_dataLoading) {
-      _scheduleRefresh = true;
-    } else {
-      _pagingController.refresh();
-    }
-  }
-
-  Future<void> _fetchPage(PageLink pageKey) async {
-    if (mounted) {
-      _dataLoading = true;
-      try {
-        hideNotification();
-        final pageData = await widget.fetchEntities(pageKey);
-        final isLastPage = !pageData.hasNext;
-        if (isLastPage) {
-          _pagingController.appendLastPage(pageData.data);
-        } else {
-          final nextPageKey = pageKey.nextPageLink();
-          _pagingController.appendPage(pageData.data, nextPageKey);
-        }
-      } catch (error) {
-        if (mounted) {
-          _pagingController.error = error;
-        }
-      } finally {
-        _dataLoading = false;
-        if (_scheduleRefresh) {
-          _scheduleRefresh = false;
-          if (mounted) {
-            _pagingController.refresh();
-          }
-        }
-      }
-    }
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-        appBar: TbAppBar(
-          tbContext,
-          title: Text(widget.title),
-          searchModeNotifier: _searchModeNotifier,
-          searchHint: widget.searchHint,
-          onSearch: (String searchText) {
-            _pagingController.firstPageKey.textSearch = searchText;
-            _pagingController.firstPageKey.page = 0;
-            _refresh();
-          },
-        ),
-        body: RefreshIndicator(
-          onRefresh: () => Future.sync(
-                () => _refresh(),
-          ),
-          child: PagedListView(
-              pagingController: _pagingController,
-              padding: EdgeInsets.all(0),
-              builderDelegate: PagedChildBuilderDelegate<T>(
-                  itemBuilder: (context, item, index) => EntityCard<T>(
-                      item,
-                      entityCardWidgetBuilder: widget.buildEntityCard,
-                      onDetails: widget.onEntityDetails,
-                      briefView: false
-                  ),
-                  firstPageProgressIndicatorBuilder: (context) {
-                      return Stack( children: [
-                          Positioned(
-                            top: 20,
-                            left: 0,
-                            right: 0,
-                            child: Row(
-                              mainAxisAlignment: MainAxisAlignment.center,
-                              children: [RefreshProgressIndicator()],
-                            ),
-                          )
-                      ]);
-                  },
-                  newPageProgressIndicatorBuilder: (context) {
-                    return Padding(
-                      padding: const EdgeInsets.only(
-                        top: 16,
-                        bottom: 16,
-                      ),
-                      child: Center(child: RefreshProgressIndicator()),
-                    );
-                  },
-                  noItemsFoundIndicatorBuilder: (context) => FirstPageExceptionIndicator(
-                    title: widget.noItemsFoundText,
-                    message: 'The list is currently empty.',
-                    onTryAgain: () => _refresh(),
-                  )
-              )
-          )
-        )
-        /* bottomNavigationBar: BottomAppBar(
-            child: Row(
-              children: [
-                IconButton(icon: Icon(Icons.refresh), onPressed: () {
-                  _refresh();
-                }),
-                Spacer(),
-                IconButton(icon: Icon(Icons.search), onPressed: () {
-                  _searchModeNotifier.value = true;
-                })
-              ]
-            )
-        ) */
-    );
-  }
-}
-
-class FirstPageExceptionIndicator extends StatelessWidget {
-  const FirstPageExceptionIndicator({
-    required this.title,
-    this.message,
-    this.onTryAgain,
-    Key? key,
-  }) : super(key: key);
-
-  final String title;
-  final String? message;
-  final VoidCallback? onTryAgain;
-
-  @override
-  Widget build(BuildContext context) {
-    final message = this.message;
-    return Center(
-      child: Padding(
-        padding: const EdgeInsets.symmetric(vertical: 32, horizontal: 16),
-        child: Column(
-          children: [
-            Text(
-              title,
-              textAlign: TextAlign.center,
-              style: Theme.of(context).textTheme.headline6,
-            ),
-            if (message != null)
-              const SizedBox(
-                height: 16,
-              ),
-            if (message != null)
-              Text(
-                message,
-                textAlign: TextAlign.center,
-              ),
-            if (onTryAgain != null)
-              const SizedBox(
-                height: 48,
-              ),
-            if (onTryAgain != null)
-              SizedBox(
-                height: 50,
-                width: double.infinity,
-                child: ElevatedButton.icon(
-                  onPressed: onTryAgain,
-                  icon: const Icon(
-                    Icons.refresh,
-                    color: Colors.white,
-                  ),
-                  label: const Text(
-                    'Try Again',
-                    style: TextStyle(
-                      fontSize: 16,
-                      color: Colors.white,
-                    ),
-                  ),
-                ),
-              ),
-          ],
-        ),
-      ),
-    );
-  }
-}

lib/core/entity/entity_grid_card.dart

@@ -0,0 +1,63 @@
+
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+import 'package:thingsboard_client/thingsboard_client.dart';
+
+import 'entities_base.dart';
+
+class EntityGridCard<T> extends StatelessWidget {
+  final T _entity;
+  final EntityTapFunction<T>? _onEntityTap;
+  final EntityCardWidgetBuilder<T> _entityCardWidgetBuilder;
+  final EntityCardSettings _settings;
+
+  EntityGridCard(T entity, {EntityTapFunction<T>? onEntityTap,
+    required EntityCardWidgetBuilder<T> entityCardWidgetBuilder,
+    required EntityCardSettings settings}):
+        this._entity = entity,
+        this._onEntityTap = onEntityTap,
+        this._entityCardWidgetBuilder = entityCardWidgetBuilder,
+        this._settings = settings;
+
+  @override
+  Widget build(BuildContext context) {
+    return
+      GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          child:
+          Container(
+            child: Card(
+                margin: EdgeInsets.zero,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(10),
+                ),
+                elevation: 0,
+                child: Padding(
+                    padding: const EdgeInsets.all(4),
+                    child: _entityCardWidgetBuilder(context, _entity)
+                )
+            ),
+            decoration: _settings.dropShadow ? BoxDecoration(
+              boxShadow: [
+                BoxShadow(
+                    color: Colors.black.withAlpha(25),
+                    blurRadius: 10.0,
+                    offset: Offset(0, 4)
+                ),
+                BoxShadow(
+                    color: Colors.black.withAlpha(18),
+                    blurRadius: 30.0,
+                    offset: Offset(0, 10)
+                ),
+              ],
+            ) : null,
+          ),
+          onTap: () {
+            if (_onEntityTap != null) {
+              _onEntityTap!(_entity);
+            }
+          }
+      );
+  }
+}
+

lib/core/entity/entity_list_card.dart

@@ -0,0 +1,73 @@
+
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+import 'entities_base.dart';
+
+class EntityListCard<T> extends StatelessWidget {
+  final bool _listWidgetCard;
+  final T _entity;
+  final EntityTapFunction<T>? _onEntityTap;
+  final EntityCardWidgetBuilder<T> _entityCardWidgetBuilder;
+  final EntityCardSettings _settings;
+
+  EntityListCard(T entity, {EntityTapFunction<T>? onEntityTap,
+    required EntityCardWidgetBuilder<T> entityCardWidgetBuilder,
+    required EntityCardSettings settings,
+    bool listWidgetCard = false}):
+        this._entity = entity,
+        this._onEntityTap = onEntityTap,
+        this._entityCardWidgetBuilder = entityCardWidgetBuilder,
+        this._settings = settings,
+        this._listWidgetCard = listWidgetCard;
+
+  @override
+  Widget build(BuildContext context) {
+    return
+      GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          child:
+          Container(
+            margin: _listWidgetCard ? EdgeInsets.only(right: 8) : EdgeInsets.zero,
+            child: Card(
+                margin: EdgeInsets.zero,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(_listWidgetCard ? 4 : 6),
+                ),
+                elevation: 0,
+                child: Padding(
+                    padding: const EdgeInsets.all(2),
+                    child: _entityCardWidgetBuilder(context, _entity)
+                )
+            ),
+            decoration: _listWidgetCard ? BoxDecoration(
+                border: Border.all(
+                    color: Color(0xFFDEDEDE),
+                    style: BorderStyle.solid,
+                    width: 1
+                ),
+                borderRadius: BorderRadius.circular(4)
+            ) : BoxDecoration(
+              boxShadow: [
+                BoxShadow(
+                    color: Colors.black.withAlpha(25),
+                    blurRadius: 10.0,
+                    offset: Offset(0, 4)
+                ),
+                BoxShadow(
+                    color: Colors.black.withAlpha(18),
+                    blurRadius: 30.0,
+                    offset: Offset(0, 10)
+                ),
+              ],
+            ),
+          ),
+          onTap: () {
+            if (_onEntityTap != null) {
+              _onEntityTap!(_entity);
+            }
+          }
+      );
+  }
+}
+