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

using ComPDFKitViewer;
using ComPDFKitViewer.AnnotEvent;
using PDF_Office.CustomControl.CompositeControl;
using PDF_Office.Helper;
using PDF_Office.Model;
using PDF_Office.Model.AnnotPanel;
using PDF_Office.Model.PropertyPanel.AnnotPanel;
using PDF_Office.ViewModels.Tools;
using PDFSettings;
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
        //手绘画笔橡皮擦的大小列表
        public List<ComboDataItem> PenSizeItems { get; protected set; }
        public List<ComboDataItem> EraserSizeItems { get; protected set; }

        private AnnotCommon _basicVm = new AnnotCommon();
        public AnnotCommon 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 = 10;
        public double EraseThicknessLine
        {
            get { return _erasethicknessLine; }
            set => SetProperty(ref _erasethicknessLine, value);
        }

        private DoubleCollection _strokeDashArray = new DoubleCollection();
        public DoubleCollection StrokeDashArray
        {
            get { return _strokeDashArray; }
            set => SetProperty(ref _strokeDashArray, 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()
        {
            InitPenSizeItems();
            InitEraserSizeItems();
            InitColorItems();
        }

        private void InitPenSizeItems()
        {
            PenSizeItems = new List<ComboDataItem>();
            ComboDataItem item = new ComboDataItem(1, "pt");
            PenSizeItems.Add(item);
            item = new ComboDataItem(2, "pt");
            PenSizeItems.Add(item);
            item = new ComboDataItem(4, "pt");
            PenSizeItems.Add(item);
            item = new ComboDataItem(6, "pt");
            PenSizeItems.Add(item);
            item = new ComboDataItem(8, "pt");
            PenSizeItems.Add(item);
        }

        private void InitEraserSizeItems()
        {
            EraserSizeItems = new List<ComboDataItem>();
            ComboDataItem item = new ComboDataItem(5, "pt");
            EraserSizeItems.Add(item);
            item = new ComboDataItem(10, "pt");
            EraserSizeItems.Add(item);
            item = new ComboDataItem(15, "pt");
            EraserSizeItems.Add(item);
            item = new ComboDataItem(20, "pt");
            EraserSizeItems.Add(item);
          
        }

        private void InitColorItems()
        {
            BasicVm.ColorItems = AnnotColorList.GetColorList(ColorSelectorType.Border);
        }

        //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();
                StrokeDashArray = new DoubleCollection();
                switch (tag)
                {
                    case "Dashed":
                        newDash.Dashes.Add(2);
                        newDash.Dashes.Add(2);
                        PropertyPanel.UpdateAnnotAAttrib(AnnotAttrib.LineStyle, newDash);

                        StrokeDashArray.Add(1);
                        StrokeDashArray.Add(1);
                        break;

                    case "Solid":
                        PropertyPanel.UpdateAnnotAAttrib(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;

                PropertyPanel.UpdateAnnotAAttrib(AnnotAttrib.Transparency, BasicVm.FillOpacity);
                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)
            {
                //属性面板，切换橡皮擦后，再回到画笔时，需要恢复最近画笔的属性值
                CurrenFreeHandAnnot = PropertyPanel.annot as FreehandAnnotArgs;
                PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotErase, btn);
                IsPen = false;
            }
        }

        private FreehandAnnotArgs CurrenFreeHandAnnot;//用来切换橡皮擦时，保存当前的手绘；
        //选择画笔
        private void Pen_Command(object obj)
        {
            var btn = obj as ToggleButton;
            if (btn.IsChecked == true)
            {
                PropertyPanel.InvokeToMyTools(AnnotArgsType.AnnotFreehand, CurrenFreeHandAnnot);
                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;
                BasicVm.IsMultiSelected = PropertyPanel.IsMultiSelected;
                if(Annot is FreehandAnnotArgs)
                {
                    BasicVm.AnnotTypeTitle = "画笔";
                }
                else
                {
                    BasicVm.AnnotTypeTitle = "橡皮擦";
                }

                if (BasicVm.IsMultiSelected)
                {
                    IsAttributeEquals();

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

        private List<FreehandAnnotArgs> ConvertLists()
        {
            List<FreehandAnnotArgs> Lists = new List<FreehandAnnotArgs>();
            foreach (var item in PropertyPanel.annotlists)
            {
                var selecteditem = item as FreehandAnnotArgs;
                if (selecteditem != null)
                {
                    Lists.Add(selecteditem);
                }
            }

            if (Lists.Count != PropertyPanel.annotlists.Count)
                return null;
            else
                return Lists;
        }
        private void IsAttributeEquals()
        {
            var list = ConvertLists();
            if (list != null)
            {
                var temp = list[0];
                Dictionary<string, bool> isNoEqualsDir = new Dictionary<string, bool>();
                isNoEqualsDir.Add("Color", false);
                isNoEqualsDir.Add("Thickness", false);
                isNoEqualsDir.Add("FontStyleFontWeight", false);
                isNoEqualsDir.Add("ThickSolidDashStyle", false);

                foreach (var item in list)
                {
                    if (item == list[0])
                        continue;

                    if (isNoEqualsDir["Color"] == false)
                    {
                        if (temp.InkColor.A != item.InkColor.A || temp.InkColor.R != item.InkColor.R || temp.InkColor.G != item.InkColor.G || temp.InkColor.B != item.InkColor.B)
                        {
                            BasicVm.FontColor = new SolidColorBrush(Colors.Transparent);
                            isNoEqualsDir["Color"] = true;
                        }
                    }


                    if (isNoEqualsDir["Thickness"] == false)
                    {
                        isNoEqualsDir["Thickness"] = true;
                        if (temp.LineWidth > item.LineWidth)
                        {
                            BasicVm.AnnotThickness = temp.LineWidth;
                        }
                        else
                        {
                            BasicVm.AnnotThickness = item.LineWidth;
                        }
                    }


                    if(isNoEqualsDir["ThickSolidDashStyle"] == false)
                    {
                        if(isSolidStyle(temp) != isSolidStyle(item))
                        {
                            isNoEqualsDir["ThickSolidDashStyle"] = true;
                        }
                    }

                }

                if (isNoEqualsDir["Color"] == false)
                {
                    BasicVm.FontColor = new SolidColorBrush(temp.InkColor);
                }

                if (isNoEqualsDir["Thickness"] == false)
                {
                    BasicVm.AnnotThickness = temp.LineWidth;
                }

                if(isNoEqualsDir["ThickSolidDashStyle"] == true)
                {
                    var isSolid = isSolidStyle(temp);
                    BasicVm.SetStrDashStyle(isSolid ? "Solid" : "Dash");
                }
                else
                {
                    BasicVm.SetStrDashStyle("None");

                }
            }
        }
        //外部UI控件选中状态
        private bool isSolidStyle(FreehandAnnotArgs annot)
        {
            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;
                    }
                }
            }
            return isSolid;
            
        }

        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;
                    var isSolid = isSolidStyle(annot);
                    BasicVm.SetStrDashStyle(isSolid ? "Solid" : "Dash");
                    IsPen = true;
                    StrokeDashArray = new DoubleCollection();
                    if (isSolid == false)
                    {
                        StrokeDashArray.Add(1);
                        StrokeDashArray.Add(1);
                    }
                }
            }

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

    }
}