YYHome/packages/cs_plugin_basic/lib/modules/preview_photo_page.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:cs_resources/generated/assets.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:plugin_basic/router/basic_page_router.dart';
import 'package:router/path/router_path.dart';
import 'package:shared/utils/screen_util.dart';
import 'package:widgets/my_load_image.dart';
import 'package:widgets/my_text_view.dart';
import 'package:cs_resources/constants/color_constants.dart';
import 'package:extended_image/extended_image.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:auto_route/auto_route.dart';

/*
 * 预览的图片的页面，内部使用PageView左右切换
 */
@RoutePage()
class PreviewPhotoPage extends HookConsumerWidget {
  final List<String> images;
  final int position;

  const PreviewPhotoPage({
    Key? key,
    required this.images,
    required this.position,
  }) : super(key: key);

  //启动当前页面
  static Future<T?>? startInstance<T>({
    required BuildContext context,
    required List<String> images,
    required int position,
  }) {
    return context.router.push(PreviewPhotoPageRoute(images: images, position: position));
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final currentIndex = useState<int>(position);

    return Scaffold(
      backgroundColor: ColorConstants.black,
      body: SafeArea(
        bottom: true,
        top: false,
        //真正的 Content 布局
        child: Column(
          children: [
            SizedBox(height: ScreenUtil.getStatusBarH(context)),
            Row(
              children: [
                //间距
                const SizedBox(width: 30),
                Expanded(
                  child: MyTextView(
                    "${currentIndex.value + 1}/${images.length}",
                    textColor: Colors.white,
                    fontSize: 18,
                    isFontRegular: true,
                    textAlign: TextAlign.center,
                  ),
                ),

                InkWell(
                  onTap: () {
                    Navigator.pop(context);
                  },
                  child: const MyAssetImage(
                    Assets.baseLibDialogDeleteIcon,
                    width: 14,
                    height: 14,
                  ),
                ),

                //间距
                const SizedBox(width: 15),
              ],
            ),
            Expanded(
                child: ExtendedImageGesturePageView.builder(
              controller: ExtendedPageController(
                //图片PageView的配置选项
                initialPage: currentIndex.value,
                pageSpacing: 10,
              ),
              itemCount: images.length,
              scrollDirection: Axis.horizontal,
              onPageChanged: (int index) {
                currentIndex.value = index;
              },
              itemBuilder: (BuildContext context, int index) {
                //默认网络加载的占位图
                final Widget placeholder = Container(
                  //如果没有设置占位图，使用默认的灰色背景内置Icon小图标
                  width: double.infinity,
                  height: double.infinity,
                  color: ColorConstants.greye0,
                  alignment: Alignment.center,
                  child: const MyAssetImage(
                    Assets.baseLibImageDefaultPlaceholder,
                    width: 38,
                    height: 32,
                  ),
                );

                //区分网络图片和本地图片
                Widget image = images[index].startsWith("http")
                    ? ExtendedImage.network(
                        images[index],
                        fit: BoxFit.contain,
                        timeLimit: const Duration(milliseconds: 30000),
                        cache: true,
                        mode: ExtendedImageMode.gesture,
                        loadStateChanged: (ExtendedImageState state) {
                          switch (state.extendedImageLoadState) {
                            case LoadState.loading:
                              return placeholder;

                            case LoadState.completed:
                              return null;

                            case LoadState.failed:
                              return placeholder;
                          }
                        },
                        initGestureConfigHandler: (ExtendedImageState state) {
                          return GestureConfig(
                            // 图片展示的配置选项
                            inPageView: true,
                            initialScale: 1.0,
                            maxScale: 5.0,
                            animationMaxScale: 6.0,
                            initialAlignment: InitialAlignment.center,
                            cacheGesture: false,
                          );
                        },
                      )
                    : ExtendedImage.file(
                        File(images[index]),
                        fit: BoxFit.contain,
                        mode: ExtendedImageMode.gesture,
                        initGestureConfigHandler: (ExtendedImageState state) {
                          return GestureConfig(
                            // 图片展示的配置选项
                            inPageView: true,
                            initialScale: 1.0,
                            maxScale: 5.0,
                            animationMaxScale: 6.0,
                            initialAlignment: InitialAlignment.center,
                            cacheGesture: false,
                          );
                        },
                      );

                if (index == currentIndex.value) {
                  return Hero(
                    // tag: index.toString(),
                    tag: "0",
                    child: image,
                  );
                } else {
                  return image;
                }
              },
            )),
          ],
        ),
      ),
    );
  }
}