build method

@override Widget build(BuildContext context)

Describes the part of the user interface represented by this widget.

The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change.

Implementation

@override
Widget build(BuildContext context) {
  return Visibility(
    visible: isVisible,
    child: AnimatedPositioned(
      duration: animationsDuration,
      bottom: 80 + context.bottomPadding,
      right: 0,
      left: 0,
      child: Container(
        height: context.width * .175,
        width: context.width,
        alignment: Alignment.center,
        child: PageView.builder(
          controller: gradientsPageController,
          itemCount: gradientColors.length,
          onPageChanged: onPageChanged,
          physics: const BouncingScrollPhysics(),
          allowImplicitScrolling: true,
          pageSnapping: false,
          itemBuilder: (context, index) {
            return GestureDetector(
              onTap: () => onItemTap(index),
              child: Container(
                height: context.width * .175,
                width: context.width * .175,
                margin: const EdgeInsets.all(4),
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    begin: FractionalOffset.topLeft,
                    end: FractionalOffset.centerRight,
                    colors: gradientColors[index],
                  ),
                  borderRadius: BorderRadius.all(
                    Radius.circular(context.width * .175),
                  ),
                  border: Border.all(
                    color: Colors.white,
                  ),
                ),
                child: Center(
                  child: AnimatedSwitcher(
                    duration: animationsDuration,
                    child: index == selectedGradientIndex
                        ? Icon(
                            CupertinoIcons.checkmark_alt,
                            color: selectedGradientIndex == 0
                                ? Colors.white
                                : gradientColors[selectedGradientIndex]
                                            .last
                                            .computeLuminance() >
                                        0.5
                                    ? Colors.black
                                    : Colors.white,
                          )
                        : const SizedBox(),
                  ),
                ),
              ),
            );
          },
        ),
      ),
    ),
  );
}