isekai_wiki_app/lib/pages/welcome_page.dart

import 'dart:ui';

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:isekai_wiki/components/isekai_page_scaffold.dart';
import 'package:isekai_wiki/global.dart';
import 'package:isekai_wiki/models/site_config.dart';
import 'package:isekai_wiki/pages/tab_page.dart';
import 'package:isekai_wiki/utils/dialog.dart';
import 'package:roundcheckbox/roundcheckbox.dart';

import '../utils/error.dart';

class WelcomePageController extends GetxController {
  var isLoading = false.obs;

  var policyAccepted = false.obs;

  void handleClickPolicyLink() {
    openUrl(Global.privacyPolicyUrl, inApp: false);
  }

  Future<void> handleClickContinue() async {
    isLoading.value = true;
    var siteConfig = Get.find<SiteConfigController>();

    try {
      await showLoading(Get.overlayContext!, callback: () async {
        await siteConfig.loadFromRemote();
      });

      // 加载完成后跳转到首页
      Navigator.of(Get.context!).pushReplacement(
        CupertinoPageRoute(
          builder: (_) => const IsekaiWikiTabsPage(),
        ),
      );
    } catch (err, stack) {
      // ignore: prefer_interpolation_to_compose_strings
      alert(Get.overlayContext!, "无法加载站点配置：" + ErrorUtils.getErrorMessage(err),
          title: "错误");
      if (kDebugMode) {
        print("Exception in logout: $err");
        stack.printError();
      }
    }
    isLoading.value = false;
  }
}

class WelcomePage extends StatelessWidget {
  const WelcomePage({super.key});

  @override
  Widget build(BuildContext context) {
    var c = Get.put(WelcomePageController());

    return IsekaiPageScaffold(
      backgroundColor: CupertinoColors.white,
      child: Stack(
        fit: StackFit.expand,
        children: [
          Container(
            decoration: const BoxDecoration(
              image: DecorationImage(
                image: ExactAssetImage('assets/images/title.png'),
                fit: BoxFit.cover,
              ),
            ),
            child: BackdropFilter(
              filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
              child: Container(
                decoration: BoxDecoration(color: Colors.black.withOpacity(0.4)),
              ),
            ),
          ),
          SafeArea(
            child: OrientationBuilder(
              builder: (context, orientation) => Padding(
                padding: orientation == Orientation.portrait
                    ? const EdgeInsets.only(
                        top: 48, right: 20, bottom: 32, left: 20)
                    : const EdgeInsets.symmetric(horizontal: 20, vertical: 32),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Flexible(
                          flex: 0,
                          child: Padding(
                            padding: const EdgeInsets.symmetric(
                                vertical: 24, horizontal: 8),
                            child: _buildSiteTitle(context, c),
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 36),
                    _buildActions(context, c),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildSiteTitle(BuildContext context, WelcomePageController c) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: const [
        MediaQuery(
          data: MediaQueryData(textScaleFactor: 1),
          child: Text(
            Global.siteTitle,
            style: TextStyle(
                fontSize: 48, color: Colors.white, fontWeight: FontWeight.bold),
          ),
        ),
        Text(
          Global.siteDescription,
          style: TextStyle(fontSize: 18, color: Colors.white),
        ),
      ],
    );
  }

  Widget _buildActions(BuildContext context, WelcomePageController c) {
    var theme = CupertinoTheme.of(context);
    var scaleFactor = MediaQuery.of(context).textScaleFactor;

    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        GestureDetector(
          behavior: HitTestBehavior.translucent,
          onTap: () {
            c.policyAccepted.value = !c.policyAccepted.value;
          },
          child: Row(
            children: [
              Obx(
                () => RoundCheckBox(
                  size: 24 * scaleFactor,
                  isChecked: c.policyAccepted.value,
                  animationDuration: Duration.zero,
                  checkedColor: theme.primaryColor,
                  checkedWidget: Icon(
                    Icons.check,
                    color: Colors.white,
                    size: 18 * scaleFactor,
                  ),
                  onTap: (checked) {
                    c.policyAccepted.value = checked ?? false;
                  },
                ),
              ),
              const SizedBox(
                width: 10,
              ),
              const Text(
                "已阅读并同意",
                style: TextStyle(color: Colors.white),
              ),
              CupertinoButton(
                padding: EdgeInsets.zero,
                onPressed: c.handleClickPolicyLink,
                child: const Text(
                  "隐私政策",
                  style: TextStyle(color: Colors.lightBlue),
                ),
              )
            ],
          ),
        ),
        const SizedBox(
          height: 18,
        ),
        Obx(
          () => CupertinoButton.filled(
            disabledColor: theme.primaryColor.withOpacity(0.6),
            onPressed: c.policyAccepted.value && !c.isLoading.value
                ? c.handleClickContinue
                : null,
            child: const Text("继续"),
          ),
        ),
      ],
    );
  }
}