slamdon

double _calculatePagePosition(int index) {
  // 卡片在整個畫面顯示的百分比
  final viewFraction = this.viewPortFraction ?? 1.0;
  
  // 卡片大小（viewportDimension 是手機畫面的 width
  final itemWidth = (this.scrollMetrics?.viewportDimension ?? 1.0) * viewFraction;
  
  // 卡片在整個 scrollView 中移動的距離
  final scrollX = this.scrollMetrics?.pixels ?? 0.0;
  

slamdon

Widget _buildImageContainer() {
  return Image.asset(
    this.trip.imageUrl,
    fit: BoxFit.cover,
    alignment: Alignment(
      this.tripPageVisibility.pagePosition,
      0,
    )
  );
}

slamdon

Widget build(BuildContext context) {
  return Center(
    child: SizedBox.fromSize(
      size: Size.fromHeight(550),
      child: PageView.builder(
        controller: PageController(viewportFraction: 0.8),
        itemCount: trips.length,
        itemBuilder: (context, index){
          return TripPageItem(trip: trips[index]);
        },

slamdon

return Padding(
  padding: EdgeInsets.symmetric(
    horizontal: 16,
  ),
  child: ClipRRect(
    borderRadius: BorderRadius.circular(20),
    child: Stack(
      fit: StackFit.expand,
      children: <Widget>[
        image,

slamdon

@override
Widget build(BuildContext context) {
  return Center(
    child: SizedBox.fromSize(
      size: Size.fromHeight(550),
      child: PageView.builder(
        itemCount: trips.length,
        itemBuilder: (context, index){
          return TripPageItem(trip: trips[index]);
        },

slamdon

return Container(
  child: ClipRRect(
    borderRadius: BorderRadius.circular(20),
    child: Stack(
      fit: StackFit.expand,
      children: <Widget>[
        image,
        imageOverlayGradient,
        _buildTextContainer(),
      ],

slamdon

var imageOverlayGradient = DecoratedBox(
  decoration: BoxDecoration(
    gradient: LinearGradient(
      begin: FractionalOffset.topCenter,
      end: FractionalOffset.bottomCenter,
      colors: [
        Color.fromRGBO(0, 0, 0, 0),
        Color.fromRGBO(0, 0, 0, 0.8),
      ],
    ),

slamdon

Widget _buildTextContainer() {
  var titleContainer = Text(
    this.trip.title,
    style: TextStyle(
      color: Colors.white,
      fontWeight: FontWeight.bold,
      letterSpacing: 1.0,
      fontSize: 14,
    ),
  );

slamdon

Widget _getPageView() {
  return pageView = PageView.builder(
    itemCount: this.widget.imagePaths.length,
    itemBuilder: (BuildContext context, int index) {
      return Image(
        image: AssetImage(this.widget.imagePaths[index]),
        fit: BoxFit.cover,
      );
    },
    onPageChanged: (index) {

slamdon

  Widget _getIndicator() {
    return Code4Indicator(
      dotCount: this.widget.imagePaths.length,
      currentIndex: currentIndex,
      dotColor: Color.fromRGBO(255, 255, 255, 1),
      dotSelectedColor: Color.fromRGBO(255, 255, 255, 0.3),
      dotPadding: 12,
      dotSize: 14,
      onItemTap: (index) {
        pageController.jumpToPage(index);