PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/HomePageToolsDialogs/HomePagePrinter/HomePagePrinterPaperSettingsDialogViewModel.cs

using Microsoft.Xaml.Behaviors;
using PDF_Office.Model;
using PDF_Office.CustomControl;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Printing;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace PDF_Office.ViewModels.Dialog.HomePageToolsDialogs.HomePagePrinter
{
    public class HomePagePrinterPaperSettingsDialogViewModel : BindableBase, IDialogAware
    {
        public string Title => "PaperSettings";
        public event Action<IDialogResult> RequestClose;

        private PrintQueue printQueue;

        private Visibility _isPageSizeStackPanelsVisible = Visibility.Hidden;
        public Visibility IsPageSizeStackPanelsVisible
        {
            get { return _isPageSizeStackPanelsVisible; }
            set { SetProperty(ref _isPageSizeStackPanelsVisible, value); }
        }

        /// <summary>
        /// 是否自定义纸张
        /// </summary>
        private bool _isCustomSize;
        public bool IsCustomSize
        {
            get => _isCustomSize;
            set
            {
                if (value)
                {
                    IsPageSizeStackPanelsVisible = Visibility.Visible;
                }
                else
                {
                    IsPageSizeStackPanelsVisible = Visibility.Hidden;
                }
                _isCustomSize = value;
            }
        }

        private int? _customPaperSizeWidth;
        /// <summary>
        /// 自定义页面尺寸：宽度
        /// </summary>
        public int? CustomPaperSizeWidth
        {
            get => _customPaperSizeWidth;
            set => _customPaperSizeWidth = value;
        }

        private int? _customPaperSizeHeight;
        /// <summary>
        /// 自定义页面尺寸：高度
        /// </summary>
        public int? CustomPaperSizeHeight
        {
            get => _customPaperSizeHeight;
            set => _customPaperSizeHeight = value;
        }

        /// <summary>
        /// 当前选中的纸张尺寸
        /// </summary>
        public PageMediaSize currentPageMediaSize;

        /// <summary>
        /// 打印机支持的纸张
        /// </summary>
        public List<PageMediaSize> PageMediaSizeList = new List<PageMediaSize>();

        /// <summary>
        /// 纸张大小列表
        /// </summary>
        private List<string> _pageMediaSizeNameList = new List<string>();
        public List<string> PageMediaSizeNameList
        {
            get => _pageMediaSizeNameList;
            set => _pageMediaSizeNameList = value;
        }

        private List<int> _margin = new List<int>();
        public List<int> Margin
        {
            get => _margin;
            set => _margin = value;
        }

        private int _pageMediaSizeIndex = 0;
        public int PageMediaSizeIndex
        {
            get=> _pageMediaSizeIndex;
            set => SetProperty(ref _pageMediaSizeIndex, value);
        }

        /// <summary>
        /// 页边距
        /// </summary>
        private int _marginTop;
        public int MarginTop
        {
            get => _marginTop;
            set => SetProperty(ref _marginTop, value);
        }

        private int _marginBottom;
        public int MarginBottom
        {
            get => _marginBottom;
            set => SetProperty(ref _marginBottom, value);
        }

        private int _marginLeft;
        public int MarginLeft
        {
            get => _marginLeft; 
            set => SetProperty(ref _marginLeft, value);
        }

        private int _marginRight;
        public int MarginRight
        {
            get => _marginRight;
            set => SetProperty(ref _marginRight, value);
        }

        public DelegateCommand CancelCommand { get; set; }
        public DelegateCommand<object> SetPaperSizeCommand { get; set; }
        public DelegateCommand ConfirmPaperSettingsCommand { get; set; }

        HomePagePrinterPaperSettingsDialogViewModel()
        {
            CancelCommand = new DelegateCommand(Cancel);
            SetPaperSizeCommand = new DelegateCommand<object>(SetPaperSize);
            ConfirmPaperSettingsCommand = new DelegateCommand(ConfirmPaperSettings);
        }

        private void InitPaperSizeList()
        {
            PageMediaSizeList.Clear();
            PageMediaSizeNameList.Clear();
            foreach (PageMediaSize size in printQueue.GetPrintCapabilities().PageMediaSizeCapability)
            {
                if (size == null || size.PageMediaSizeName == null)
                {
                    continue;
                }
                PageMediaSizeList.Add(size);
                PageMediaSizeNameList.Add(size.PageMediaSizeName.ToString());
            }
            PageMediaSizeNameList.Add("自定义");
            if (PageMediaSizeNameList.Contains("ISOA4"))
            {
                PageMediaSizeIndex = PageMediaSizeNameList.IndexOf("ISOA4");
            }
            else
            {
                PageMediaSizeIndex = 0;
            }
            currentPageMediaSize = PageMediaSizeList[PageMediaSizeIndex];
        }

        public void SetPaperSize(object e)
        {
            var cmb = e as ComboBox;
            if (cmb.SelectedIndex < PageMediaSizeNameList.Count - 1)
            {
                IsCustomSize = false;
                currentPageMediaSize = PageMediaSizeList[PageMediaSizeNameList.IndexOf(cmb.SelectedItem.ToString())];
            }
            else
            {
                IsCustomSize = true;
            }
        }

        public void ConfirmPaperSettings ()
        {
            if (IsCustomSize)
            {
                if (CustomPaperSizeHeight!=null&&CustomPaperSizeWidth!=null)
                {
                    currentPageMediaSize = new PageMediaSize((double)CustomPaperSizeWidth, (double)CustomPaperSizeHeight);
                }
                else
                {
                    MessageBoxEx.Show("纸张尺寸缺失");
                    return;
                }
            }
            Margin.Add(MarginLeft);
            Margin.Add(MarginTop);
            Margin.Add(MarginRight);
            Margin.Add(MarginBottom);
            var dialogResult = new DialogResult(ButtonResult.OK);
            dialogResult.Parameters.Add("PageMediaSize", currentPageMediaSize);
            dialogResult.Parameters.Add("MarginLeft", MarginLeft);
            dialogResult.Parameters.Add("MarginTop", MarginTop);
            dialogResult.Parameters.Add("MarginRight", MarginRight);
            dialogResult.Parameters.Add("MarginBottom", MarginBottom);
            RequestClose.Invoke(dialogResult);
        }

        public void Cancel()
        {
            var dialogResult = new DialogResult(ButtonResult.Cancel);
            RequestClose.Invoke(dialogResult);
        }

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            parameters.TryGetValue<PrintQueue>(ParameterNames.PrintQueue, out printQueue);
            InitPaperSizeList();
        }
    }
}