flutter-go/lib/components/widget_demo.dart

/// @author Nealyang
/// 新widget详情页模板

import 'dart:core';

import 'package:flutter/material.dart';
import 'package:flutter_go/utils/data_utils.dart';

import '../routers/application.dart';
import '../routers/routers.dart';
import '../components/markdown.dart';
/// import '../model/collection.dart';
import '../widgets/index.dart';
import '../event/event_bus.dart';
import '../event/event_model.dart';

class WidgetDemo extends StatefulWidget {
  final List<dynamic> contentList;
  final String docUrl;
  final String title;
  final String codeUrl;
  final Widget bottomNaviBar;

  WidgetDemo(
      {Key key,
      @required this.title,
      @required this.contentList,
      this.codeUrl,
      this.docUrl,
      this.bottomNaviBar})
      : super(key: key);

  _WidgetDemoState createState() => _WidgetDemoState();
}

class _WidgetDemoState extends State<WidgetDemo> {
  bool _hasCollected = false;
  /// CollectionControlModel _collectionControl = new CollectionControlModel();
  var _collectionIcons;
  List widgetDemosList = new WidgetDemoList().getDemos();
  String widgetType = 'old';
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

  List<Widget> _buildContent() {
    List<Widget> _list = [
      SizedBox(
        height: 10.0,
      ),
    ];
    widget.contentList.forEach((item) {
      if (item.runtimeType == String) {
        _list.add(MarkdownBody(item));
        _list.add(
          SizedBox(
            height: 20.0,
          ),
        );
      } else {
        _list.add(item);
      }
    });
    return _list;
  }

  @override
  void initState() {
    super.initState();
    // 这里不能直接 使用 ` ModalRoute.of(context)` 会产生报错
    Future.delayed(Duration.zero, () {
      String currentPath = ModalRoute.of(context).settings.name;
      if (currentPath.indexOf('/standard-page') == 0) {
        widgetType = 'standard';
      }
      Map<String, String> params = {
        'type': widgetType,
        "url": currentPath,
        "name": widget.title
      };
      DataUtils.checkCollected(params).then((result) {
        if (this.mounted) {
          setState(() {
            _hasCollected = result ?? null;
          });
        }
      });
    });
  }

// 点击收藏按钮
  _getCollection() {
    String currentRouterPath = ModalRoute.of(context).settings.name;
    Map<String, String> params = {
      "type": widgetType,
      "url": currentRouterPath,
      "name": widget.title
    };
    if (_hasCollected) {
      // 删除操作
      DataUtils.removeCollected(params, context).then((result) {
        if (result) {
          _scaffoldKey.currentState
              .showSnackBar(SnackBar(content: Text('已取消收藏')));
          if (ApplicationEvent.event != null) {
            ApplicationEvent.event
                .fire(CollectionEvent(widget.title, currentRouterPath, true));
          }
          if (this.mounted) {
            setState(() {
              _hasCollected = false;
            });
          }
        }
      });
    } else {
      // 插入操作
      DataUtils.addCollected(params, context).then((result) {
        if (result) {
          if (this.mounted) {
            setState(() {
              _hasCollected = true;
            });
          }
          _scaffoldKey.currentState
              .showSnackBar(SnackBar(content: Text('收藏成功')));
          if (ApplicationEvent.event != null) {
            ApplicationEvent.event
                .fire(CollectionEvent(widget.title, currentRouterPath, false));
          }
        }
      });
    }
  }

  void _selectValue(value) {
    if (value == 'doc') {
      // _launchURL(widget.docUrl);
      Application.router.navigateTo(context,
          '${Routes.webViewPage}?title=${Uri.encodeComponent(widget.title)} Doc&&url=${Uri.encodeComponent(widget.docUrl)}');
    } else if (value == 'code') {
      Application.router.navigateTo(context,
          '${Routes.codeView}?filePath=${Uri.encodeComponent(widget.codeUrl)}');
    }
  }
  List<PopupMenuEntry<String>> buildPopupMenu() {
    List<PopupMenuEntry<String>> comps = [];
    if (widget.docUrl != null) {
      comps.add(
          PopupMenuItem<String>(
            value: 'doc',
            child: ListTile(
              leading: Icon(
                Icons.library_books,
                size: 22.0,
              ),
              title: Text('查看文档'),
            ),
          )
      );
    }
    if (widget.codeUrl != null) {
      comps.add(
          PopupMenuItem<String>(
            value: 'code',
            child: ListTile(
              leading: Icon(
                Icons.code,
                size: 22.0,
              ),
              title: Text('查看Demo'),
            ),
          )
      );
    }
    return comps;
  }
  @override
  Widget build(BuildContext context) {
    if (_hasCollected) {
      _collectionIcons = Icons.favorite;
    } else {
      _collectionIcons = Icons.favorite_border;
    }
    List<PopupMenuEntry<String>> menus = buildPopupMenu();
    List<Widget> actions = [
      new IconButton(
        tooltip: 'goBack home',
        onPressed: () {
            Navigator.popUntil(context, ModalRoute.withName(Routes.root));
        },
        icon: Icon(Icons.home),
      ),
      new IconButton(
        tooltip: 'collection',
        onPressed: _getCollection,
        icon: Icon(_collectionIcons),
      ),
    ];
    if (menus.length > 0) {
      actions.add(
          PopupMenuButton<String>(
            onSelected: _selectValue,
            itemBuilder: (BuildContext context) => menus,
          )
      );
    }
    return Scaffold(
        key: _scaffoldKey,
        appBar: AppBar(
          title: Text(widget.title),
          actions: actions,
        ),
        body: Container(
          padding: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 15.0),
          child: ListView(
            shrinkWrap: true,
            padding: const EdgeInsets.all(0.0),
            children: <Widget>[
              Column(
                children: _buildContent(),
              ),
            ],
          ),
        ),
        bottomNavigationBar:
            (widget.bottomNaviBar is Widget) ? widget.bottomNaviBar : null);
  }
}