Source Code added

mobile/lib/widgets/asset_grid/immich_asset_grid.dart

@@ -0,0 +1,135 @@
+import 'dart:math';
+
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/extensions/asyncvalue_extensions.dart';
+import 'package:immich_mobile/providers/timeline.provider.dart';
+import 'package:immich_mobile/widgets/asset_grid/asset_grid_data_structure.dart';
+import 'package:immich_mobile/widgets/asset_grid/immich_asset_grid_view.dart';
+import 'package:immich_mobile/providers/app_settings.provider.dart';
+import 'package:immich_mobile/services/app_settings.service.dart';
+import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:scrollable_positioned_list/scrollable_positioned_list.dart';
+
+class ImmichAssetGrid extends HookConsumerWidget {
+  final int? assetsPerRow;
+  final double margin;
+  final bool? showStorageIndicator;
+  final ImmichAssetGridSelectionListener? listener;
+  final bool selectionActive;
+  final List<Asset>? assets;
+  final RenderList? renderList;
+  final Future<void> Function()? onRefresh;
+  final Set<Asset>? preselectedAssets;
+  final bool canDeselect;
+  final bool? dynamicLayout;
+  final bool showMultiSelectIndicator;
+  final void Function(Iterable<ItemPosition> itemPositions)? visibleItemsListener;
+  final Widget? topWidget;
+  final bool shrinkWrap;
+  final bool showDragScroll;
+  final bool showDragScrollLabel;
+  final bool showStack;
+
+  const ImmichAssetGrid({
+    super.key,
+    this.assets,
+    this.onRefresh,
+    this.renderList,
+    this.assetsPerRow,
+    this.showStorageIndicator,
+    this.listener,
+    this.margin = 2.0,
+    this.selectionActive = false,
+    this.preselectedAssets,
+    this.canDeselect = true,
+    this.dynamicLayout,
+    this.showMultiSelectIndicator = true,
+    this.visibleItemsListener,
+    this.topWidget,
+    this.shrinkWrap = false,
+    this.showDragScroll = true,
+    this.showDragScrollLabel = true,
+    this.showStack = false,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    var settings = ref.watch(appSettingsServiceProvider);
+
+    final perRow = useState(assetsPerRow ?? settings.getSetting(AppSettingsEnum.tilesPerRow)!);
+    final scaleFactor = useState(7.0 - perRow.value);
+    final baseScaleFactor = useState(7.0 - perRow.value);
+
+    /// assets need different hero tags across tabs / modals
+    /// otherwise, hero animations are performed across tabs (looks buggy!)
+    int heroOffset() {
+      const int range = 1152921504606846976; // 2^60
+      final tabScope = TabsRouterScope.of(context);
+      if (tabScope != null) {
+        final int tabIndex = tabScope.controller.activeIndex;
+        return tabIndex * range;
+      }
+      return range * 7;
+    }
+
+    Widget buildAssetGridView(RenderList renderList) {
+      return RawGestureDetector(
+        gestures: {
+          CustomScaleGestureRecognizer: GestureRecognizerFactoryWithHandlers<CustomScaleGestureRecognizer>(
+            () => CustomScaleGestureRecognizer(),
+            (CustomScaleGestureRecognizer scale) {
+              scale.onStart = (details) {
+                baseScaleFactor.value = scaleFactor.value;
+              };
+
+              scale.onUpdate = (details) {
+                scaleFactor.value = max(min(5.0, baseScaleFactor.value * details.scale), 1.0);
+                if (7 - scaleFactor.value.toInt() != perRow.value) {
+                  perRow.value = 7 - scaleFactor.value.toInt();
+                  settings.setSetting(AppSettingsEnum.tilesPerRow, perRow.value);
+                }
+              };
+            },
+          ),
+        },
+        child: ImmichAssetGridView(
+          onRefresh: onRefresh,
+          assetsPerRow: perRow.value,
+          listener: listener,
+          showStorageIndicator: showStorageIndicator ?? settings.getSetting(AppSettingsEnum.storageIndicator),
+          renderList: renderList,
+          margin: margin,
+          selectionActive: selectionActive,
+          preselectedAssets: preselectedAssets,
+          canDeselect: canDeselect,
+          dynamicLayout: dynamicLayout ?? settings.getSetting(AppSettingsEnum.dynamicLayout),
+          showMultiSelectIndicator: showMultiSelectIndicator,
+          visibleItemsListener: visibleItemsListener,
+          topWidget: topWidget,
+          heroOffset: heroOffset(),
+          shrinkWrap: shrinkWrap,
+          showDragScroll: showDragScroll,
+          showStack: showStack,
+          showLabel: showDragScrollLabel,
+        ),
+      );
+    }
+
+    if (renderList != null) return buildAssetGridView(renderList!);
+
+    final renderListFuture = ref.watch(assetsTimelineProvider(assets!));
+    return renderListFuture.widgetWhen(onData: (renderList) => buildAssetGridView(renderList));
+  }
+}
+
+/// accepts a gesture even though it should reject it (because child won)
+class CustomScaleGestureRecognizer extends ScaleGestureRecognizer {
+  @override
+  void rejectGesture(int pointer) {
+    acceptGesture(pointer);
+  }
+}