buildContent method

@override Widget buildContent(BuildContext context, RefreshStatus? mode)

Builds the content of the indicator.

Implementation

@override
Widget buildContent(BuildContext context, RefreshStatus? mode) {
  final double indicatorOpacity = mode == RefreshStatus.idle
      ? 0.0
      : const Interval(0.0, 0.2, curve: Curves.easeIn).transform(_progress);
  final bool isCompleting =
      mode == RefreshStatus.completed || mode == RefreshStatus.failed;
  final double dismissValue =
      Curves.easeOut.transform(_dismissController.value);
  final double dismissScale =
      isCompleting ? ui.lerpDouble(1.0, 0.5, dismissValue) ?? 0.5 : 1.0;
  final double dismissOpacity = isCompleting ? 1.0 - dismissValue : 1.0;
  final bool showTimestamp = widget.showLastUpdated &&
      mode == RefreshStatus.completed &&
      _lastUpdatedAt != null;

  final RefreshString strings =
      RefreshLocalizations.of(context)?.currentLocalization ??
          EnRefreshString();
  final String label = widget.semanticsLabel ??
      (mode == RefreshStatus.completed
          ? strings.refreshCompleteText!
          : mode == RefreshStatus.failed
              ? strings.refreshFailedText!
              : mode == RefreshStatus.refreshing
                  ? strings.refreshingText!
                  : mode == RefreshStatus.canRefresh
                      ? strings.canRefreshText!
                      : strings.idleRefreshText!);

  final Widget indicator = AnimatedBuilder(
    animation: Listenable.merge(<Listenable>[
      _rotationController,
      _scaleController,
      _opacityController,
      _dismissController,
    ]),
    builder: (BuildContext context, Widget? child) {
      return Opacity(
        opacity: (indicatorOpacity * dismissOpacity).clamp(0.0, 1.0),
        child: Transform.scale(
          scale: _scaleAnimation.value * dismissScale,
          child: Ios17ActivityIndicator(
            color: _resolvedColor,
            radius: widget.radius,
            progress: mode == RefreshStatus.refreshing || isCompleting
                ? 1.0
                : _progress,
            rotationValue: _rotationController.value,
            gradientOpacity: mode == RefreshStatus.refreshing ||
                    mode == RefreshStatus.completed ||
                    mode == RefreshStatus.failed
                ? Curves.easeIn.transform(_opacityController.value)
                : 0.0,
          ),
        ),
      );
    },
  );

  Widget content = indicator;
  if (showTimestamp) {
    final String text = widget.lastUpdatedTextBuilder != null
        ? debugIos17HeaderLastUpdatedText(
            updatedAt: _lastUpdatedAt!,
            builder: widget.lastUpdatedTextBuilder,
          )
        : debugIos17HeaderLastUpdatedText(
            updatedAt: _lastUpdatedAt!,
            now: DateTime.now(),
          );
    content = Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        indicator,
        const SizedBox(height: 4.0),
        Opacity(
          opacity: dismissOpacity.clamp(0.0, 1.0),
          child: Text(
            text,
            style: CupertinoTheme.of(context)
                .textTheme
                .tabLabelTextStyle
                .copyWith(color: _resolvedColor, fontSize: 11.0),
          ),
        ),
      ],
    );
  }

  return SizedBox(
    height: widget.height,
    child: Center(
      child: Semantics(
        label: label,
        hint: widget.semanticsHint,
        child: content,
      ),
    ),
  );
}