flutter-todos/lib/logic/task_detail_page_logic.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:todo_list/config/provider_config.dart';
import 'package:todo_list/database/database.dart';
import 'package:todo_list/json/task_bean.dart';
import 'package:todo_list/model/all_model.dart';

class TaskDetailPageLogic {
  final TaskDetailPageModel _model;

  TaskDetailPageLogic(this._model);

  double _getOverallProgress() {
    int length = _model.taskBean.detailList.length;
    double overallProgress = 0.0;
    for (int i = 0; i < length; i++) {
      overallProgress += _model.taskBean.detailList[i].itemProgress / length;
    }
    _model.taskBean.overallProgress = overallProgress;
    return overallProgress;
  }

  void refreshProgress(
      TaskDetailBean taskDetailBean, progress, MainPageModel model) {
    taskDetailBean.itemProgress = progress;
    _getOverallProgress();
    model.refresh();
    _model.refresh();
  }

  //页面退出需要执行的逻辑,isDeleting表示这个页面是否执行了删除当前任务的操作
  void exitPage({bool isDeleting = false}) {
    final context = _model.context;
    final mainPageModel = _model.globalModel.mainPageModel;
    bool needUpdate = needUpdateDatabase();
    if (needUpdate && !isDeleting) {
      //如果一个任务中的所有任务项都完成了,因为主页面都是未完成任务，所以删除主页面的该任务
      if (_model.taskBean.overallProgress >= 1.0) {
        _model.taskBean.finishDate = DateTime.now().toIso8601String();
        //下面这个延时操作，目的如下，如果一个任务完成了，主页面会把这个任务去除掉
        //这个时候主页任务卡片的herotag就消失了，因为herotag不一致，会导致hero动画失效
        Future.delayed(Duration(milliseconds: 800, ), (){
          debugPrint("删除了");
          removeTask(mainPageModel);
          debugPrint("刷新main");
          mainPageModel.refresh();
        });
      }
      _model.taskBean.changeTimes++;
      DBProvider.db.updateTask(_model.taskBean).then((value){
        //如果是从"完成列表"过来
        if (_model.doneTaskPageModel != null) {
          mainPageModel.logic.getTasks();
          _model.doneTaskPageModel.logic.getDoneTasks().then((value) {
            _model.doneTaskPageModel.refresh();
            Navigator.of(context).pop();
          });
        }
        //如果是从"搜索页面"过来
        else if(_model.searchPageModel != null){
          _model.isExiting = true;
          _model.refresh();
          mainPageModel.logic.getTasks();
          _model.searchPageModel.logic.onEditingComplete();
          Navigator.of(context).pop();
        }
        else {
          debugPrint("退出了");
          _model.isExiting = true;
          _model.refresh();
          Navigator.of(context).pop();
        }
      });
      return;
    }
    _model.isExiting = true;
    _model.refresh();
    Navigator.of(context).pop();
  }

  bool needUpdateDatabase() {
    return _model.progress != _model.taskBean.overallProgress;
  }

  void deleteTask(MainPageModel mainPageModel) {
    removeTask(mainPageModel);
    DBProvider.db.deleteTask(_model.taskBean.id);
    _model.refresh();
    //如果是从“完成列表”过来
    final doneTaskPageModel = _model.doneTaskPageModel;
    if (doneTaskPageModel != null) {
      doneTaskPageModel.doneTasks.removeAt(doneTaskPageModel.currentTapIndex);
      doneTaskPageModel.refresh();
    }
    //如果是从"搜索界面"过来
    final searchPageModel = _model.searchPageModel;
    if(searchPageModel != null){
      searchPageModel.searchTasks.removeAt(searchPageModel.currentTapIndex);
      searchPageModel.refresh();
    }
    exitPage(isDeleting: true);
  }

  void removeTask(MainPageModel mainPageModel) {
    for (var i = 0; i < mainPageModel.tasks.length; i++) {
      var task = mainPageModel.tasks[i];
      if(task.id == _model.taskBean.id){
        mainPageModel.tasks.removeAt(i);
        return;
      }
    }
  }

  void editTask(MainPageModel mainPageModel) {
    Navigator.of(_model.context).push(
      new CupertinoPageRoute(
        builder: (ctx) {
          return ProviderConfig.getInstance().getEditTaskPage(
            _model.taskBean.taskIconBean,
            taskBean: _model.taskBean,
            taskDetailPageModel: _model,
          );
        },
      ),
    );
  }
}