appleOSLayout method

@override Widget appleOSLayout(BuildContext context)

Layout for Apple OS devices. 苹果系列设备的选择器布局

Implementation

@override
Widget appleOSLayout(BuildContext context) {
  Widget _gridLayout(BuildContext context) {
    return ValueListenableBuilder<bool>(
      valueListenable: isSwitchingPath,
      builder: (_, bool isSwitchingPath, __) => Semantics(
        excludeSemantics: isSwitchingPath,
        child: RepaintBoundary(
          child: Stack(
            children: <Widget>[
              Positioned.fill(child: assetsGridBuilder(context)),
              if (!isSingleAssetMode || isPreviewEnabled)
                Positioned.fill(
                  top: null,
                  child: bottomActionBar(context),
                ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _layout(BuildContext context) {
    return Stack(
      children: <Widget>[
        Positioned.fill(
          child: Consumer<DefaultAssetPickerProvider>(
            builder: (_, DefaultAssetPickerProvider p, __) {
              final Widget child;
              final bool shouldDisplayAssets =
                  p.hasAssetsToDisplay || shouldBuildSpecialItem;
              if (shouldDisplayAssets) {
                child = Stack(
                  children: <Widget>[
                    _gridLayout(context),
                    pathEntityListBackdrop(context),
                    pathEntityListWidget(context),
                  ],
                );
              } else {
                child = loadingIndicator(context);
              }
              return AnimatedSwitcher(
                duration: switchingPathDuration,
                child: child,
              );
            },
          ),
        ),
        appBar(context),
      ],
    );
  }

  return ValueListenableBuilder<bool>(
    valueListenable: permissionOverlayDisplay,
    builder: (_, bool value, Widget? child) {
      if (value) {
        return ExcludeSemantics(child: child);
      }
      return child!;
    },
    child: _layout(context),
  );
}