confirmButton method

@override Widget confirmButton(BuildContext context)

It'll pop with AssetPickerProvider.selectedAssets when there are any assets were chosen. Then, the assets picker will pop too. 当有资源已选时，点击按钮将把已选资源通过路由返回。 资源选择器将识别并一同返回。

Implementation

@override
Widget confirmButton(BuildContext context) {
  return ChangeNotifierProvider<
      AssetPickerViewerProvider<AssetEntity>?>.value(
    value: provider,
    child: Consumer<AssetPickerViewerProvider<AssetEntity>?>(
      builder: (_, AssetPickerViewerProvider<AssetEntity>? provider, __) {
        assert(
          isWeChatMoment || provider != null,
          'Viewer provider must not be null'
          'when the special type is not WeChat moment.',
        );
        return MaterialButton(
          minWidth: () {
            if (isWeChatMoment && hasVideo) {
              return 48.0;
            }
            return provider!.isSelectedNotEmpty ? 48.0 : 20.0;
          }(),
          height: 32.0,
          padding: const EdgeInsets.symmetric(horizontal: 12.0),
          color: themeData.colorScheme.secondary,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(3.0),
          ),
          child: ScaleText(
            () {
              if (isWeChatMoment && hasVideo) {
                return Constants.textDelegate.confirm;
              }
              if (provider!.isSelectedNotEmpty) {
                return '${Constants.textDelegate.confirm}'
                    ' (${provider.currentlySelectedAssets.length}'
                    '/'
                    '${selectorProvider!.maxAssets})';
              }
              return Constants.textDelegate.confirm;
            }(),
            style: TextStyle(
              color: themeData.textTheme.bodyText1?.color,
              fontSize: 17,
              fontWeight: FontWeight.normal,
            ),
          ),
          onPressed: () {
            if (isWeChatMoment && hasVideo) {
              Navigator.of(context).pop(<AssetEntity>[currentAsset]);
              return;
            }
            if (provider!.isSelectedNotEmpty) {
              Navigator.of(context).pop(provider.currentlySelectedAssets);
              return;
            }
            selectAsset(currentAsset);
            Navigator.of(context).pop(
              selectedAssets ?? <AssetEntity>[currentAsset],
            );
          },
          materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
        );
      },
    ),
  );
}