PDFOffice_Windows_exe/PDF Office/ViewModels/PropertyPanel/AnnotPanel/FreehandAnnotPropertyViewModel.cs

using ComPDFKitViewer;
using ComPDFKitViewer.AnnotEvent;
using PDF_Office.Model;
using PDF_Office.Model.PropertyPanel.AnnotPanel;
using PDF_Office.ViewModels.Tools;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Media;

namespace PDF_Office.ViewModels.PropertyPanel.AnnotPanel
{
    public class EraseThicknessConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is double)
            {
                return (double)value * 6;
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public class FreehandAnnotPropertyViewModel : BindableBase, INavigationAware
    {
        #region 属性

        private AnnotBasePropertyVM _basicVm = new AnnotBasePropertyVM();
        public AnnotBasePropertyVM BasicVm
        {
            get { return _basicVm; }
            set => SetProperty(ref _basicVm, value);
        }

        private bool _isPen = true;
        public bool IsPen
        {
            get { return _isPen; }
            set => SetProperty(ref _isPen, value);
        }

        private double _erasethicknessLine = 1;
        public double EraseThicknessLine
        {
            get { return _erasethicknessLine; }
            set => SetProperty(ref _erasethicknessLine, value);
        }

        #endregion 属性

        public AnnotAttribEvent AnnotEvent { get; set; }
        private AnnotHandlerEventArgs Annot;
        private AnnotPropertyPanel PropertyPanel;
        public DelegateCommand<object> EraseCommand { get; set; }
        public DelegateCommand<object> PenCommand { get; set; }

        public DelegateCommand<object> SelectedColorChangedCommand { get; set; }
        public DelegateCommand<object> SelectPenThickChangedCommand { get; set; }
        public DelegateCommand<object> SetEraserThickCommand { get; set; }
        public DelegateCommand<object> LineModeCheckedCommand { get; set; }
        public DelegateCommand<object> SelectedOpacityValueCommand { get; set; }

        public FreehandAnnotPropertyViewModel()
        {
            EraseCommand = new DelegateCommand<object>(Erase_Command);
            PenCommand = new DelegateCommand<object>(Pen_Command);

            SelectedColorChangedCommand = new DelegateCommand<object>(SelectedColorChanged);
            SelectPenThickChangedCommand = new DelegateCommand<object>(SelectPenThickChanged);
            SetEraserThickCommand = new DelegateCommand<object>(SelectEraserThickChanged);
            LineModeCheckedCommand = new DelegateCommand<object>(LineMode_Checked);
            SelectedOpacityValueCommand = new DelegateCommand<object>(SelectedOpacityValue);

            InitVariable();
        }

        private void InitVariable()
        {

        }

        //设置颜色
        private void SelectedColorChanged(object obj)
        {
            if (obj != null)
            {
                var colorValue = (Color)obj;
                if (colorValue != null)
                {
                    BasicVm.FontColor = new SolidColorBrush(colorValue);
                    BasicVm.FontColor.Opacity = BasicVm.FillOpacity;

                    PropertyPanel.UpdateAnnotAAttrib(AnnotAttrib.Color, colorValue);

                    if (BasicVm.IsMultiSelected == false)
                    {
                        PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotFreehand, colorValue);
                    }

                }
            }
        }

        //设置线条大小
        private void SelectPenThickChanged(object obj)
        {
            if (obj != null && obj is double)
            {
                var thick = (double)obj;
                PropertyPanel.UpdateAnnotAAttrib(AnnotAttrib.Thickness, thick);
            }
        }

        //设置橡皮擦大小
        private void SelectEraserThickChanged(object obj)
        {
            if (obj != null && obj is double)
            {
                var eraser = (double)obj;
                AnnotEvent?.UpdateAttrib(AnnotAttrib.Thickness, eraser);
                AnnotEvent?.UpdateAnnot();
            }
        }

        //设置线条样式
        private void LineMode_Checked(object obj)
        {
            if (obj != null)
            {
                var tag = ((string)obj);
                DashStyle newDash = new DashStyle();
                switch (tag)
                {
                    case "Dashed":
                        newDash.Dashes.Add(2);
                        newDash.Dashes.Add(2);
                     //   AnnotEvent?.UpdateAttrib(AnnotAttrib.LineStyle, DashStyles.Dash);
                        AnnotEvent?.UpdateAttrib(AnnotAttrib.LineStyle, newDash);
                        
                        break;

                    case "Solid":
                        AnnotEvent?.UpdateAttrib(AnnotAttrib.LineStyle, DashStyles.Solid);
                        break;

                }
               
                AnnotEvent?.UpdateAnnot();
            }
        }

        //设置不透明度
        private void SelectedOpacityValue(object obj)
        {
            if (obj != null)
            {
                BasicVm.FillOpacity = (double)obj;
                BasicVm.FontColor.Opacity = BasicVm.FillOpacity;

                AnnotEvent?.UpdateAttrib(AnnotAttrib.Transparency, BasicVm.FillOpacity);
                AnnotEvent?.UpdateAnnot();
                PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotFreehand, BasicVm.FillOpacity);
            }
        }

       //选择橡皮擦
        private void Erase_Command(object obj)
        {
            var btn = obj as ToggleButton;
            if(btn.IsChecked == true)
            {
                PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotErase, btn);
                IsPen = false;
            }
        }

        //选择画笔
        private void Pen_Command(object obj)
        {
            var btn = obj as ToggleButton;
            if (btn.IsChecked == true)
            {
                PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotErase, btn);
                IsPen = true;
            }
        }


        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
            BasicVm.IsMultiSelected = false;
        }



        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<AnnotPropertyPanel>(ParameterNames.PropertyPanelContentViewModel, out PropertyPanel);
            if (PropertyPanel != null)
            {
                AnnotEvent = PropertyPanel.AnnotEvent;
                Annot = PropertyPanel.annot;
                if (PropertyPanel.annotlists != null && PropertyPanel.annotlists.Count > 1)
                {
                    BasicVm.IsMultiSelected = true;
                }
                else
                {
                    BasicVm.IsMultiSelected = false;
                }

                if (BasicVm.IsMultiSelected)
                {
                    double thickness = 0;
                    foreach(var item in PropertyPanel.annotlists)
                    {
                        if ((item as FreehandAnnotArgs).LineWidth >= thickness)
                            thickness = (item as FreehandAnnotArgs).LineWidth;
                    }

                    BasicVm.AnnotThickness = thickness;
                    BasicVm.SetStrDashStyle("None");
                }
                else
                {
                    GetAnnotProperty();
                }
                   
            }
        }

        private void GetAnnotProperty()
        {
            if (Annot is FreehandAnnotArgs)
            {
                var annot  = Annot as FreehandAnnotArgs;
                if (annot != null)
                {
                    BasicVm.FillOpacity = annot.Transparency;
                    BasicVm.FontColor = new SolidColorBrush(annot.InkColor);
                    BasicVm.AnnotThickness = annot.LineWidth;
                    BasicVm.Dash = annot.LineDash;
                    bool isSolid = true;
                    if(annot.LineDash != null && annot.LineDash.Dashes.Count > 0)
                    {
                        foreach(var item in annot.LineDash.Dashes)
                        {
                            if(item > 0)
                            {
                                isSolid = false;
                                break;
                            }
                        }
                    }

                    BasicVm.SetStrDashStyle(isSolid ? "Solid" : "Dash");
                    IsPen = true;
                }
            }

            if (Annot is EraseArgs)
            {
                var annot = Annot as EraseArgs;
                if (annot != null)
                {
                    EraseThicknessLine = annot.Thickness;
                    IsPen = false;
                }
            }
        }

    }
}