HKC/DM_Weight/ViewModels/SettingMainWindowViewModel.cs

using DM_Weight.Common;
using DM_Weight.Models;
using DM_Weight.util;
using Prism.Commands;
using Prism.Common;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DM_Weight.ViewModels
{
    public class SettingMainWindowViewModel : BindableBase, INavigationAware, IRegionMemberLifetime
    {
        //设置页面数据集
        private ObservableCollection<SettingPage> _settingPages;
        public ObservableCollection<SettingPage> SettingPages
        {
            get => _settingPages;
            set => SetProperty(ref _settingPages, value);
        }
        //默认加载页面
        string defaultView = string.Empty;

        IRegionManager _regionManager;

        public SettingMainWindowViewModel(IRegionManager regionManager)
        {
            this._regionManager = regionManager;
        }
        //选中事件
        public DelegateCommand<string> NavigateCommand { get => new DelegateCommand<string>(navigateAction); }

        public bool KeepAlive => false;

        private void navigateAction(string obj)
        {
            if (obj == null || string.IsNullOrWhiteSpace(obj))
            {
                return;
            }
            defaultView = obj;
            _regionManager.RequestNavigate(PrismManager.SettingViewRegionName, defaultView);
        }
        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            if (SettingPages is null || SettingPages.Count <= 0)
            {
                //if (Convert.ToInt32(ConfigurationManager.AppSettings["hasFridge"]) <= 1)
                {
                    SettingPages = new ObservableCollection<SettingPage>(SqlSugarHelper.Db.Queryable<SettingPage>().Where(p=>p.Id!="2").ToList());
                }
                //else
                //{
                //    SettingPages = new ObservableCollection<SettingPage>(SqlSugarHelper.Db.Queryable<SettingPage>().Where(p => p.Id != "3").ToList());
                //}
                if (SettingPages.Count > 0)
                {
                    if (string.IsNullOrEmpty(defaultView))
                    {
                        defaultView = SettingPages[0].ViewName;
                    }
                    _regionManager.RequestNavigate(PrismManager.SettingViewRegionName, defaultView);
                }
            }
        }
    }
}