谢宇宁
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import 'package:flutter/material.dart';
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import 'package:hjsq/hj_utils/screen.dart';
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import 'package:hjsq/tools_base/widget/card_swiper/src/swiper.dart';
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import 'package:hjsq/tools_base/widget/image_browser_page.dart';
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import 'package:hjsq/tools_base/widget/net_image_widget.dart';
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import '../../hj_model/splash/ads_model.dart';
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import 'ads_item.dart';
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/// 广告轮播的指示器位置
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enum IndicatorAlign {
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bottomRight, //右下角（默认）
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bottomCenter, //底部居中，小号主题黄点（视频广告 cell 用）
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underCenter, //轮播下方居中（Column 布局，轮播固定高 256）
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}
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/// 广告轮播：多张时自动轮播 + 指示器
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class AdsBanner extends StatefulWidget {
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final List<AdsInfoModel>? models; //广告数据
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final double? width;
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final double? height;
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final int autoPlayMs; //自动轮播间隔（毫秒）
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final double borderRadius; //图片圆角
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final ValueChanged<int>? onTap; //点击某页，传 index
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final ValueChanged<int>? onIndexChanged; //切换页，传 index
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// ===== 指示器 =====
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final IndicatorAlign indicatorAlign;
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final IndicatorStyle indicatorStyle;
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final Color? color; //未选中色，不传按位置/样式取默认
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final Color? selectColor; //选中色，不传按位置/样式取默认
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const AdsBanner(
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this.models, {
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super.key,
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this.width,
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this.height,
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this.autoPlayMs = 5000,
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this.borderRadius = 12,
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this.onTap,
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this.onIndexChanged,
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this.indicatorAlign = IndicatorAlign.bottomRight,
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this.indicatorStyle = IndicatorStyle.bar,
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this.color,
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this.selectColor,
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});
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@override
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State<AdsBanner> createState() => _AdsBannerState();
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}
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class _AdsBannerState extends State<AdsBanner> {
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//当前页随轮播变化，用 ValueNotifier 局部刷新指示器，避免每次都 setState 重建整棵树(含 Swiper)
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final _index = ValueNotifier(0);
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int get _count => widget.models?.length ?? 0;
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@override
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void dispose() {
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_index.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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//指示器放轮播下方：轮播固定高 256（唯一调用方不传 height，靠它撑开 Swiper）
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if (widget.indicatorAlign == IndicatorAlign.underCenter) {
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return SizedBox(
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width: widget.width,
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height: widget.height,
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child: Column(
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children: [
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SizedBox(height: 256, child: _swiper()),
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12.sizeBoxH,
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if (_count > 1)
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Center(
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child: _indicator(
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space: 4,
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dotSize: 4,
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selectWidth: 8,
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color: widget.color,
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selectColor: widget.selectColor)),
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],
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),
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);
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}
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return SizedBox(
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width: widget.width,
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height: widget.height,
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child: Stack(
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clipBehavior: Clip.none,
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children: [
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_swiper(),
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//指示器：只有一张时不出
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if (_count > 1)
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widget.indicatorAlign == IndicatorAlign.bottomCenter
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? Positioned(
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bottom: 10,
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left: 0,
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right: 0,
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child: Center(
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child: _indicator(
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space: 2,
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dotSize: 2,
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selectWidth: 5,
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//视频广告 cell：主题黄(未选中半透明,选中实心)
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color: widget.color ??
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const Color(0xffFFD900).withValues(alpha: 0.4),
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selectColor:
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widget.selectColor ?? const Color(0xffFFD900),
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),
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),
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)
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: Positioned(
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bottom: 7,
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right: 7,
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child: _indicator(
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space: 4,
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dotSize: 4,
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selectWidth: 8,
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color: widget.color,
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selectColor: widget.selectColor),
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),
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],
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),
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);
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}
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//轮播主体；两种指示器布局共用
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Widget _swiper() {
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return Swiper(
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autoplay: _count > 1,
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autoplayDelay: widget.autoPlayMs,
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loop: _count > 1,
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itemBuilder: (_, index) => AdsItem(
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adInfo: widget.models![index],
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showType: AdShowType.img,
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borderRadius: widget.borderRadius,
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),
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onTap: widget.onTap,
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onIndexChanged: (index) {
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_index.value = index;
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widget.onIndexChanged?.call(index);
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},
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itemCount: _count,
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);
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}
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//指示器随当前页局部刷新
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Widget _indicator({
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required double space,
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required double dotSize,
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required double selectWidth,
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Color? color,
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Color? selectColor,
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}) {
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return ValueListenableBuilder<int>(
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valueListenable: _index,
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builder: (_, index, __) => DotIndicator(
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count: _count,
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index: index,
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space: space,
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dotSize: dotSize,
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selectWidth: selectWidth,
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style: widget.indicatorStyle,
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color: color,
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selectColor: selectColor,
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),
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);
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}
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}
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/// 指示器样式
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enum IndicatorStyle {
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bar, //选中项拉成长条，默认红色系
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dot, //全是圆点，默认白色系
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}
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/// 分页指示器：选中项宽度与颜色平滑过渡(类似 Android 系统页面指示器)
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class DotIndicator extends StatelessWidget {
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final int count; //圆点总数
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final int index; //当前选中页
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final double space; //每个点左侧的间距
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final double dotSize; //圆点直径
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final double selectWidth; //选中长条宽度，仅 bar 样式生效
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final IndicatorStyle style;
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final Color? color; //未选中色，不传按样式取默认
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final Color? selectColor; //选中色，不传按样式取默认
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const DotIndicator({
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super.key,
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required this.count,
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required this.index,
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this.space = 5,
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this.dotSize = 6,
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this.selectWidth = 12,
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this.style = IndicatorStyle.bar,
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this.color,
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this.selectColor,
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});
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@override
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Widget build(BuildContext context) {
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final isBar = style == IndicatorStyle.bar;
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final activeColor =
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selectColor ?? (isBar ? const Color(0xffE1351F) : Colors.white);
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final inactiveColor = color ??
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(isBar
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? const Color(0xffE1351F).withValues(alpha: 0.3)
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: Colors.white.withValues(alpha: 0.5));
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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for (var i = 0; i < count; i++)
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Padding(
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padding: EdgeInsets.only(left: space),
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child: AnimatedContainer(
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duration: const Duration(milliseconds: 300),
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curve: Curves.easeOutCubic,
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width: i == index && isBar ? selectWidth : dotSize,
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height: dotSize,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(dotSize / 2),
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color: i == index ? activeColor : inactiveColor,
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),
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),
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),
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],
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);
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}
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}
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/// 图片轮播：左右滑动浏览，点图看大图，多张时右下角出指示器
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class ImageSwiper extends StatefulWidget {
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final List<String>? imgs;
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final double aspectRatio;
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const ImageSwiper({super.key, this.imgs, required this.aspectRatio});
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@override
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State<ImageSwiper> createState() => _ImageSwiperState();
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}
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class _ImageSwiperState extends State<ImageSwiper> {
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//当前页用 ValueNotifier 局部刷新指示器，避免每次滑动都 setState 重建 Swiper
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final _index = ValueNotifier(0);
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int get _count => widget.imgs?.length ?? 0;
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@override
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void dispose() {
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_index.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return AspectRatio(
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aspectRatio: widget.aspectRatio,
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child: Stack(
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alignment: Alignment.center,
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children: [
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Swiper(
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autoplay: _count > 1,
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loop: _count > 1,
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itemBuilder: (_, index) => InkWell(
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enableFeedback: false,
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onTap: () =>
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ImageBrowserPage.open(widget.imgs ?? [], index: index),
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child: NetworkImageLoader(imageUrl: widget.imgs![index]),
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),
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onIndexChanged: (index) => _index.value = index,
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itemCount: _count,
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),
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if (_count > 1)
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Positioned(
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bottom: 10,
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right: 12,
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child: ValueListenableBuilder<int>(
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valueListenable: _index,
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builder: (_, index, __) =>
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DotIndicator(count: _count, index: index, space: 6),
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),
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),
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],
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),
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);
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}
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}
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/// AI 图生视频 banner：每页左原图、右生成图，多张时自动轮播
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class AiBanner extends StatefulWidget {
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final List<AdsInfoModel>? models;
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const AiBanner({super.key, this.models});
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@override
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State<AiBanner> createState() => _AiBannerState();
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}
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class _AiBannerState extends State<AiBanner> {
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//当前页用 ValueNotifier 局部刷新指示器，避免滑动重建 Swiper
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final _index = ValueNotifier(0);
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int get _count => widget.models?.length ?? 0;
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@override
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void dispose() {
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_index.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Stack(
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children: [
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Swiper(
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autoplay: _count > 1,
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loop: _count > 1,
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autoplayDelay: 5000,
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itemBuilder: (_, index) {
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final item = widget.models?[index];
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//左：原图 右：AI 生成图
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return Row(children: [
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Expanded(
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child: NetworkImageLoader(
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imageUrl: item?.cover ?? '', borderRadius: 0)),
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Expanded(
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child: NetworkImageLoader(
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imageUrl: item?.newUrl ?? '', borderRadius: 0)),
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]);
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},
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onIndexChanged: (index) => _index.value = index,
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itemCount: _count,
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),
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if (_count > 1)
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Positioned(
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bottom: 10,
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right: 10,
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child: ValueListenableBuilder<int>(
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valueListenable: _index,
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builder: (_, index, __) =>
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DotIndicator(count: _count, index: index),
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),
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),
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],
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);
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}
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}
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Reference in New Issue
Block a user