PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/NoviceGuidDialogViewModel.cs

using PDF_Office.Model;
using PDF_Office.Model.Dialog;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace PDF_Office.ViewModels.Dialog
{
    public class NoviceGuidDialogViewModel :BindableBase,IDialogAware
    {
        public string Title => "";

        public event Action<IDialogResult> RequestClose;

        private int selectedIndex;

        /// <summary>
        /// 选中索引
        /// </summary>
        public int SelectedIndex
        {
            get { return selectedIndex; }
            set
            {
                SetProperty(ref selectedIndex, value);

                if(SelectedIndex==ItemSource.Count-1)
                {
                    SignUpVisible = Visibility.Visible;
                }
                else
                {
                    SignUpVisible = Visibility.Collapsed;
                }

                if(SelectedIndex==0)
                {
                    NextTimeVisible = Visibility.Visible;
                }
                else
                {
                    NextTimeVisible = Visibility.Collapsed;
                }
            }
        }

        private Visibility signUpVisible = Visibility.Collapsed;

        /// <summary>
        /// 是否显示SignUp按钮
        /// </summary>
        public Visibility SignUpVisible
        {
            get { return signUpVisible; }
            set
            {
                SetProperty(ref signUpVisible, value);
            }
        }   

        private Visibility nexttimeVisible;

        public Visibility NextTimeVisible
        {
            get { return nexttimeVisible; }
            set
            {
                SetProperty(ref nexttimeVisible, value);
            }
        }



        public DelegateCommand NextPageCommand { get; set; }

        public DelegateCommand PrePageCommand { get; set; }

        public DelegateCommand NextTimeCommand { get; set; }

        public DelegateCommand SignUpCommand { get; set; }

        public ObservableCollection<GuidItemModel> ItemSource { get; set; }

        private IDialogService dialog;

        public NoviceGuidDialogViewModel(IDialogService dialogService)
        {
            dialog = dialogService;

            NextPageCommand = new DelegateCommand(NextPage,CanNextPageExcute).ObservesProperty(()=>SelectedIndex);
            PrePageCommand = new DelegateCommand(PrePage,CanPrePageExcute).ObservesProperty(()=>SelectedIndex);
            SignUpCommand = new DelegateCommand(SignUp);

            InitItemSource();
        }

        private void InitItemSource()
        {
            ItemSource = new ObservableCollection<GuidItemModel>();
            ItemSource.Add(new GuidItemModel() { ImageSource = "pack://application:,,,/PDF Office;component/Resources/GuidItems/Guid_Office.png", Title = "PDF Office 全新体验版", Content = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });
            ItemSource.Add(new GuidItemModel() { ImageSource = "pack://application:,,,/PDF Office;component/Resources/GuidItems/Guid_Annote.png", Title = "强大的PDF注释工具", Content = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });
            ItemSource.Add(new GuidItemModel() { ImageSource = "pack://application:,,,/PDF Office;component/Resources/GuidItems/Guid_Convert.png", Title = "将PDF转换为可编辑Office", Content = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });
            ItemSource.Add(new GuidItemModel() { ImageSource = "pack://application:,,,/PDF Office;component/Resources/GuidItems/Guid_FillAndSign.png", Title = "填写表格，签署商务文件", Content = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });
            ItemSource.Add(new GuidItemModel() { ImageSource = "pack://application:,,,/PDF Office;component/Resources/GuidItems/Guid_SignUp.png", Title = "注册账号享受全功能", Content = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });
        }

        /// <summary>
        /// 前一页
        /// </summary>
        private void NextPage()
        {
            SelectedIndex++;
        }

        /// <summary>
        /// 下一页
        /// </summary>
        private void PrePage()
        {
            SelectedIndex--;
        }

        /// <summary>
        /// 注册
        /// </summary>
        private void SignUp()
        {
            RequestClose.Invoke(new DialogResult());
            dialog.ShowDialog(DialogNames.RegisterDialog);
        }

        /// <summary>
        /// 下一次显示
        /// </summary>
        private void NextTime()
        {
            //Todo
        }


        //是否可以执行下一页
        private bool CanNextPageExcute()
        {
            if(SelectedIndex>=ItemSource.Count-1)
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// 是否可以执行上一页
        /// </summary>
        /// <returns></returns>
        private bool CanPrePageExcute()
        {
            if (SelectedIndex <= 0)
            {
                return false;
            }
            return true;
        }


        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
          
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
           
        }
    }
}