assetGridItemSemanticsBuilder method

@override Widget assetGridItemSemanticsBuilder(BuildContext context, int index, AssetEntity asset, Widget child,)

The Semantics builder for the assets' grid. 资源列表项的语义构建

Implementation

@override
Widget assetGridItemSemanticsBuilder(
  BuildContext context,
  int index,
  AssetEntity asset,
  Widget child,
) {
  return ValueListenableBuilder<bool>(
    valueListenable: isSwitchingPath,
    builder: (_, bool isSwitchingPath, Widget? child) {
      return Consumer<DefaultAssetPickerProvider>(
        builder: (_, DefaultAssetPickerProvider p, __) {
          final bool isBanned = (!p.selectedAssets.contains(asset) &&
                  p.selectedMaximumAssets) ||
              (isWeChatMoment &&
                  asset.type == AssetType.video &&
                  p.selectedAssets.isNotEmpty);
          final bool isSelected = p.selectedDescriptions.contains(
            asset.toString(),
          );
          final int selectedIndex = p.selectedAssets.indexOf(asset) + 1;
          String hint = '';
          if (asset.type == AssetType.audio ||
              asset.type == AssetType.video) {
            hint += '${semanticsTextDelegate.sNameDurationLabel}: ';
            hint += semanticsTextDelegate.durationIndicatorBuilder(
              asset.videoDuration,
            );
          }
          if (asset.title?.isNotEmpty ?? false) {
            hint += ', ${asset.title}';
          }
          return Semantics(
            key: ValueKey('${asset.id}-semantics'),
            button: false,
            enabled: !isBanned,
            excludeSemantics: true,
            focusable: !isSwitchingPath,
            label: '${semanticsTextDelegate.semanticTypeLabel(asset.type)}'
                '${semanticIndex(index)}, '
                '${asset.createDateTime.toString().replaceAll('.000', '')}',
            hidden: isSwitchingPath,
            hint: hint,
            image: asset.type == AssetType.image ||
                asset.type == AssetType.video,
            onTap: () {
              selectAsset(context, asset, index, isSelected);
            },
            onTapHint: semanticsTextDelegate.sActionSelectHint,
            onLongPress: isPreviewEnabled
                ? () {
                    viewAsset(context, index, asset);
                  }
                : null,
            onLongPressHint: semanticsTextDelegate.sActionPreviewHint,
            selected: isSelected,
            sortKey: OrdinalSortKey(
              semanticIndex(index).toDouble(),
              name: 'GridItem',
            ),
            value: selectedIndex > 0 ? '$selectedIndex' : null,
            child: GestureDetector(
              // Regression https://github.com/flutter/flutter/issues/35112.
              onLongPress: isPreviewEnabled &&
                      MediaQuery.accessibleNavigationOf(context)
                  ? () {
                      viewAsset(context, index, asset);
                    }
                  : null,
              child: IndexedSemantics(
                index: semanticIndex(index),
                child: child,
              ),
            ),
          );
        },
      );
    },
    child: child,
  );
}