kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/PDFView/PDFViewControl/PDFViewControl.xaml.cs

using ComPDFKit.PDFAnnotation;
using ComPDFKit.PDFAnnotation.Form;
using ComPDFKit.PDFDocument;
using ComPDFKit.Tool;
using ComPDFKit.Tool.SettingParam;
using Compdfkit_Tools.PDFControlUI;
using ComPDFKitViewer;
using ComPDFKitViewer.BaseObject;
using ComPDFKitViewer.Widget;
using Nager.Country.Currencies;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Compdfkit_Tools.Helper;
using ComPDFKit.Tool.DrawTool;
using static ComPDFKit.Tool.CPDFToolManager;
using static Compdfkit_Tools.PDFControlUI.CPDFViewModeUI;
using SplitMode = Compdfkit_Tools.PDFControlUI.CPDFViewModeUI.SplitMode;
using System.Threading;
using System.Threading.Tasks;

namespace Compdfkit_Tools.PDFControl
{
    public partial class PDFViewControl : UserControl
    {
        private CPDFViewerTool splitViewerTool;
        private CPDFToolManager splitToolManager;

        private CPDFViewerTool viewerTool;
        private CPDFToolManager toolManager;


        public CPDFViewerTool PDFViewTool { get; private set; }
        public CPDFToolManager PDFToolManager { get; private set; }

        public CPDFViewerTool FocusPDFViewTool { get; private set; }

        //public event EventHandler SplitPDFViewToolCreated;
        public event EventHandler FocusPDFViewToolChanged;
        public event EventHandler<MouseEventObject> MouseLeftButtonDownHandler;
        public event EventHandler<MouseEventObject> MouseLeftButtonUpHandler;
        public event EventHandler<MouseEventObject> MouseMoveHandler;
        public event EventHandler<MouseEventObject> MouseRightButtonDownHandler;
        public event EventHandler<ComPDFKitViewer.MouseWheelZoomArgs> MouseWheelZoomHandler;
        public event EventHandler DrawChanged;

        //private ContextMenu RightMenu;
        #region Properties

        private double splitWidthScale = 0.5;
        private double splitHeightScale = 0.5;

        public bool CustomSignHandle { get; set; }

        private double[] zoomLevelList = { 1f, 8f, 12f, 25, 33f, 50, 66f, 75, 100, 125, 150, 200, 300, 400, 600, 800, 1000 };
        #endregion
        public PDFViewControl()
        {
            InitializeComponent();
            viewerTool = new CPDFViewerTool();
            toolManager = new CPDFToolManager(viewerTool);
            Loaded += PDFViewControl_Loaded;
            PDFViewTool = viewerTool;
            PDFToolManager = toolManager;
            PDFToolManager.SetToolType(CPDFToolManager.ToolType.Viewer);

            splitViewerTool = new CPDFViewerTool();
            splitToolManager = new CPDFToolManager(splitViewerTool);
            splitToolManager.SetToolType(CPDFToolManager.ToolType.Viewer);

            FocusPDFViewTool = viewerTool;
            PDFView.Child = PDFViewTool;
            VerticalView.Child = splitViewerTool;

            PDFViewTool.SizeChanged -= PDFViewTool_SizeChanged;
            PDFViewTool.GetCPDFViewer().MouseWheelZoomHandler -= PDFViewControl_MouseWheelZoomHandler;
            PDFViewTool.GetCPDFViewer().MouseMove -= PDFViewControl_MouseMove;
            PDFViewTool.DrawChanged -= PDFViewTool_DrawChanged;
            PDFToolManager.MouseLeftButtonDownHandler -= PDFToolManager_MouseLeftButtonDownHandler;
            PDFToolManager.MouseLeftButtonUpHandler -= PDFToolManager_MouseLeftButtonUpHandler;
            PDFToolManager.MouseMoveHandler -= PDFToolManager_MouseMoveHandler;
            PDFToolManager.AnnotDefaultEditedHandler -= PDFToolManager_AnnotDefaultEditedHandler;
            PDFToolManager.MouseRightButtonDownHandler -= PDFToolManager_MouseRightButtonDownHandler;

            PDFViewTool.SizeChanged += PDFViewTool_SizeChanged;
            PDFViewTool.GetCPDFViewer().MouseWheelZoomHandler += PDFViewControl_MouseWheelZoomHandler;
            PDFViewTool.GetCPDFViewer().MouseMove += PDFViewControl_MouseMove;
            PDFViewTool.DrawChanged += PDFViewTool_DrawChanged;
            PDFToolManager.MouseLeftButtonDownHandler += PDFToolManager_MouseLeftButtonDownHandler;
            PDFToolManager.MouseLeftButtonUpHandler += PDFToolManager_MouseLeftButtonUpHandler;
            PDFToolManager.MouseMoveHandler += PDFToolManager_MouseMoveHandler;
            PDFToolManager.AnnotDefaultEditedHandler += PDFToolManager_AnnotDefaultEditedHandler;
            PDFToolManager.MouseRightButtonDownHandler += PDFToolManager_MouseRightButtonDownHandler;

            splitViewerTool.SizeChanged -= SplitViewerTool_SizeChanged;
            splitViewerTool.GetCPDFViewer().MouseWheelZoomHandler -= SplitPDFViewControl_MouseWheelZoomHandler;
            splitViewerTool.DrawChanged -= PDFViewTool_DrawChanged;
            splitToolManager.MouseLeftButtonDownHandler -= PDFToolManager_MouseLeftButtonDownHandler;
            splitToolManager.MouseLeftButtonUpHandler -= PDFToolManager_MouseLeftButtonUpHandler;
            splitToolManager.MouseMoveHandler -= PDFToolManager_MouseMoveHandler;
            splitToolManager.AnnotDefaultEditedHandler -= PDFToolManager_AnnotDefaultEditedHandler;
            splitToolManager.MouseRightButtonDownHandler -= PDFToolManager_MouseRightButtonDownHandler;

            splitViewerTool.SizeChanged += SplitViewerTool_SizeChanged;
            splitViewerTool.GetCPDFViewer().MouseWheelZoomHandler += SplitPDFViewControl_MouseWheelZoomHandler;
            splitViewerTool.DrawChanged += PDFViewTool_DrawChanged;
            splitToolManager.MouseLeftButtonDownHandler += PDFToolManager_MouseLeftButtonDownHandler;
            splitToolManager.MouseLeftButtonUpHandler += PDFToolManager_MouseLeftButtonUpHandler;
            splitToolManager.MouseMoveHandler += PDFToolManager_MouseMoveHandler;
            splitToolManager.AnnotDefaultEditedHandler += PDFToolManager_AnnotDefaultEditedHandler;
            splitToolManager.MouseRightButtonDownHandler += PDFToolManager_MouseRightButtonDownHandler;
        }

        private void PDFToolManager_AnnotDefaultEditedHandler(object sender, SelectedAnnotData e)
        {
            UpdateAnnotFrame();
        }

        private void PDFViewControl_Loaded(object sender, RoutedEventArgs e)
        {
            RemoveSplitViewerTool();
        }

        private void PDFViewTool_DrawChanged(object sender, EventArgs e)
        {
            DrawChanged?.Invoke(sender, e);
        }

        public ContextMenu GetRightMenu()
        {
            FocusPDFViewTool.ContextMenu?.Items.Clear();
            return FocusPDFViewTool.ContextMenu;
        }

        public void SetRightMenu(ContextMenu contextMenu)
        {
            FocusPDFViewTool.ContextMenu = contextMenu;
        }

        private void PDFToolManager_MouseRightButtonDownHandler(object sender, MouseEventObject e)
        {
            Point point = e.mouseButtonEventArgs.GetPosition(this);
            viewerTool.GetCPDFViewer().GetPointPageInfo(point, out int index, out Rect paintRect, out Rect pageBound);
            if (index == -1)
            {
                viewerTool.ContextMenu = null;
                return;
            }
            PDFViewTool.SetPastePoint(point);
            MouseRightButtonDownHandler?.Invoke(sender, e);
        }

        private void PDFToolManager_MouseMoveHandler(object sender, MouseEventObject e)
        {
            MouseMoveHandler?.Invoke(this, e);
        }

        private void PDFToolManager_MouseLeftButtonUpHandler(object sender, MouseEventObject e)
        {
            MouseLeftButtonUpHandler?.Invoke(sender, e);
        }

        private void PDFToolManager_MouseLeftButtonDownHandler(object sender, MouseEventObject e)
        {
            MouseLeftButtonDownHandler?.Invoke(sender, e);
        }

        private void PDFViewTool_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            PDFViewTool.GetCPDFViewer().UpdateRenderFrame();
        }

        private void SplitViewerTool_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            if (VerticalView.Visibility == Visibility.Visible)
            {
                splitWidthScale = VerticalView.ActualWidth / ViewToolGrid.ActualWidth;
            }
            if (HorizontalView.Visibility == Visibility.Visible)
            {
                splitHeightScale = HorizontalView.ActualHeight / ViewToolGrid.ActualHeight;
            }
            splitViewerTool.GetCPDFViewer().UpdateRenderFrame();
        }

        public void InitDocument(string Path)
        {
            CPDFDocument pdfDoc = CPDFDocument.InitWithFilePath(Path);
            if (pdfDoc != null)
            {
                PDFViewTool.GetCPDFViewer().InitDoc(pdfDoc);

                PDFViewTool.GetCPDFViewer().SetFitMode(FitMode.FitHeight);
                PDFViewTool.GetCPDFViewer().SetViewMode(ViewMode.SingleContinuous);

                splitViewerTool.GetCPDFViewer().InitDoc(pdfDoc);

                splitViewerTool.GetCPDFViewer().SetFitMode(FitMode.FitHeight);
                splitViewerTool.GetCPDFViewer().SetViewMode(ViewMode.SingleContinuous);
            }
        }

        private void PDFViewControl_MouseWheelZoomHandler(object sender, ComPDFKitViewer.MouseWheelZoomArgs e)
        {
            FocusPDFViewTool = PDFViewTool;
            FocusPDFViewToolChanged?.Invoke(this, EventArgs.Empty);
            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                e.IsZoom = true;
                PDFViewTool.GetCPDFViewer().SetFitMode(FitMode.FitZoom);
                double zoom = PDFViewTool.GetCPDFViewer().GetZoom();
                PDFViewTool.GetCPDFViewer().SetZoom(CheckZoomLevel(zoom, Convert.ToBoolean(e.WheelBehavior)));
                PDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            }
            MouseWheelZoomHandler?.Invoke(this, e);
        }

        private void SplitPDFViewControl_MouseWheelZoomHandler(object sender, ComPDFKitViewer.MouseWheelZoomArgs e)
        {
            FocusPDFViewTool = splitViewerTool;
            FocusPDFViewToolChanged?.Invoke(this, EventArgs.Empty);
            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                e.IsZoom = true;
                splitViewerTool.GetCPDFViewer().SetFitMode(FitMode.FitZoom);
                double zoom = splitViewerTool.GetCPDFViewer().GetZoom();
                splitViewerTool.GetCPDFViewer().SetZoom(CheckZoomLevel(zoom, Convert.ToBoolean(e.WheelBehavior)));
                splitViewerTool?.GetCPDFViewer()?.UpdateRenderFrame();
            }
            MouseWheelZoomHandler?.Invoke(this, e);
        }

        public void SetSplitViewMode(SplitMode splitMode)
        {
            switch (splitMode)
            {
                case SplitMode.None:
                    RemoveSplitViewerTool();
                    break;
                case SplitMode.Vertical:
                    RemoveSplitViewerTool();
                    if (splitViewerTool != null)
                    {
                        VerticalSplitter.Visibility = Visibility.Visible;
                        VerticalView.Visibility = Visibility.Visible;
                        ViewToolGrid.ColumnDefinitions[1].Width = new GridLength(15, GridUnitType.Auto);
                        ViewToolGrid.ColumnDefinitions[2].Width = new GridLength(ViewToolGrid.ActualWidth / 2);
                        VerticalView.Child = splitViewerTool;
                    }
                    break;
                case SplitMode.Horizontal:
                    RemoveSplitViewerTool();
                    if (splitViewerTool != null)
                    {
                        HorizontalSplitter.Visibility = Visibility.Visible;
                        HorizontalView.Visibility = Visibility.Visible;
                        ViewToolGrid.RowDefinitions[1].Height = new GridLength(15, GridUnitType.Auto);
                        ViewToolGrid.RowDefinitions[2].Height = new GridLength(ViewToolGrid.ActualHeight / 2);
                        HorizontalView.Child = splitViewerTool;
                    }
                    break;
            }
            UpdateRenderFrame();
            UpdateAnnotFrame();
        }

        public void UpdateRenderFrame()
        {
            viewerTool?.GetCPDFViewer()?.UpdateRenderFrame();
            splitViewerTool?.GetCPDFViewer()?.UpdateRenderFrame();
        }

        public void UpdateAnnotFrame()
        {
            viewerTool?.GetCPDFViewer()?.UpdateAnnotFrame();
            splitViewerTool?.GetCPDFViewer()?.UpdateAnnotFrame();
        }

        public void SetCropMode(bool isCrop)
        {
            viewerTool?.GetCPDFViewer()?.SetIsCrop(isCrop);
            splitViewerTool?.GetCPDFViewer()?.SetIsCrop(isCrop);

            viewerTool?.GetCPDFViewer()?.UpdateVirtualNodes();
            splitViewerTool?.GetCPDFViewer()?.UpdateVirtualNodes();

            viewerTool?.GetCPDFViewer()?.UpdateRenderFrame();
            splitViewerTool?.GetCPDFViewer()?.UpdateRenderFrame();

        }

        public void SetToolType(ToolType type)
        {
            toolManager?.SetToolType(type);
            splitToolManager?.SetToolType(type);
        }

        public void SetCreateAnnotType(C_ANNOTATION_TYPE type)
        {
            toolManager?.SetCreateAnnotType(type);
            splitToolManager?.SetCreateAnnotType(type);
        }

        public void SetCreateWidgetType(C_WIDGET_TYPE type)
        {
            toolManager?.SetCreateWidgetType(type);
            splitToolManager?.SetCreateWidgetType(type);
        }

        public void SetAnnotParam(AnnotParam param)
        {
            DefaultSettingParam defaultSettingParam = viewerTool.GetDefaultSettingParam();
            DefaultSettingParam splitSettingParam = splitViewerTool.GetDefaultSettingParam();
            defaultSettingParam.SetAnnotParam(param);
            splitSettingParam.SetAnnotParam(param);
        }

        public void SetIsShowStampMouse(bool isShow)
        {
            viewerTool?.GetCPDFViewer()?.SetIsShowStampMouse(isShow);
            splitViewerTool?.GetCPDFViewer()?.SetIsShowStampMouse(isShow);
        }

        public void SetDrawModes(DrawModeData drawMode)
        {
            viewerTool?.GetCPDFViewer()?.SetDrawModes(drawMode.DrawMode);
            splitViewerTool?.GetCPDFViewer()?.SetDrawModes(drawMode.DrawMode);
            if (drawMode.DrawMode == DrawMode.Custom)
            {
                viewerTool?.GetCPDFViewer().SetPDFBackground(drawMode.CustomColor);
                splitViewerTool?.GetCPDFViewer().SetPDFBackground(drawMode.CustomColor);
            }
            UpdateRenderFrame();
        }

        public void SetStampMouseImage(byte[] imageArray, int imageWidth, int imageHeight)
        {
            viewerTool?.GetCPDFViewer()?.SetStampMouseImage(imageArray, imageWidth, imageHeight);
            splitViewerTool?.GetCPDFViewer()?.SetStampMouseImage(imageArray, imageWidth, imageHeight);
        }

        public bool SetStampMouseImage(string filePath)
        {
            if ((bool)(viewerTool?.GetCPDFViewer()?.SetStampMouseImage(filePath)) && (bool)splitViewerTool?.GetCPDFViewer()?.SetStampMouseImage(filePath))
            {
                return true;
            }
            return false;
        }

        public void SetIsVisibleCustomMouse(bool isVisbleCustomMouse)
        {
            viewerTool?.GetCPDFViewer()?.SetIsVisibleCustomMouse(isVisbleCustomMouse);
            splitViewerTool?.GetCPDFViewer()?.SetIsVisibleCustomMouse(isVisbleCustomMouse);
        }

        public CPDFViewer GetCPDFViewer()
        {
            return FocusPDFViewTool?.GetCPDFViewer();
        }

        public BaseWidget GetCacheHitTestWidget()
        {
            return FocusPDFViewTool?.GetCacheHitTestWidget();
        }

        public BaseAnnot GetCacheHitTestAnnot()
        {
            return FocusPDFViewTool?.GetCacheHitTestAnnot();
        }

        public void CreateViewerMenu(object sender, ref ContextMenu contextMenu)
        {
            MenuItem fitWidthMenu = new MenuItem();
            fitWidthMenu.Header = LanguageHelper.CommonManager.GetString("Menu_AutoSize");
            fitWidthMenu.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetFitMode(FitMode.FitWidth);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(fitWidthMenu);

            MenuItem fitSizeMenu = new MenuItem();
            fitSizeMenu.Header = LanguageHelper.CommonManager.GetString("Menu_RealSize");
            fitSizeMenu.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetFitMode(FitMode.FitOriginal);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(fitSizeMenu);

            MenuItem zoomInMenu = new MenuItem();
            zoomInMenu.Header = LanguageHelper.CommonManager.GetString("Menu_ZoomIn");
            zoomInMenu.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetFitMode(FitMode.FitZoom);
                double zoom = FocusPDFViewTool?.GetCPDFViewer()?.GetZoom() ?? 1;
                FocusPDFViewTool?.GetCPDFViewer()?.SetZoom(CheckZoomLevel(zoom, true));
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(zoomInMenu);

            MenuItem zoomOutMenu = new MenuItem();
            zoomOutMenu.Header = LanguageHelper.CommonManager.GetString("Menu_ZoomOut");
            zoomOutMenu.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetFitMode(FitMode.FitZoom);
                double zoom = FocusPDFViewTool?.GetCPDFViewer()?.GetZoom() ?? 1;
                FocusPDFViewTool?.GetCPDFViewer()?.SetZoom(CheckZoomLevel(zoom, false));
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(zoomOutMenu);

            contextMenu.Items.Add(new Separator());

            MenuItem singleView = new MenuItem();
            singleView.Header = LanguageHelper.CommonManager.GetString("Menu_SinglePage");
            singleView.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetViewMode(ViewMode.Single);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(singleView);

            MenuItem singleContinuousView = new MenuItem();
            singleContinuousView.Header = LanguageHelper.CommonManager.GetString("Menu_SingleContinuous");
            singleContinuousView.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetViewMode(ViewMode.SingleContinuous);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(singleContinuousView);

            MenuItem doubleView = new MenuItem();
            doubleView.Header = LanguageHelper.CommonManager.GetString("Menu_DoublePage");
            doubleView.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetViewMode(ViewMode.Double);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(doubleView);

            MenuItem doubleContinuousView = new MenuItem();
            doubleContinuousView.Header = LanguageHelper.CommonManager.GetString("Menu_DoubleContinuous");
            doubleContinuousView.Click += (o, p) =>
            {
                FocusPDFViewTool?.GetCPDFViewer()?.SetViewMode(ViewMode.DoubleContinuous);
                FocusPDFViewTool?.GetCPDFViewer()?.UpdateRenderFrame();
            };
            contextMenu.Items.Add(doubleContinuousView);
            contextMenu.Items.Add(new Separator());

            MenuItem resetFormMenu = new MenuItem();
            resetFormMenu.Header = LanguageHelper.CommonManager.GetString("Menu_Reset");
            resetFormMenu.Click += (o, p) =>
            {
                //FocusPDFViewTool?.GetCPDFViewer()?.ResetForm();
            };
            contextMenu.Items.Add(resetFormMenu);
        }

        private void RemoveSplitViewerTool()
        {
            UpdateRenderFrame();
            VerticalSplitter.Visibility = Visibility.Collapsed;
            HorizontalSplitter.Visibility = Visibility.Collapsed;
            VerticalView.Visibility = Visibility.Collapsed;
            HorizontalView.Visibility = Visibility.Collapsed;
            ViewToolGrid.ColumnDefinitions[1].Width = new GridLength(0);
            ViewToolGrid.ColumnDefinitions[2].Width = new GridLength(0);
            ViewToolGrid.RowDefinitions[1].Height = new GridLength(0);
            ViewToolGrid.RowDefinitions[2].Height = new GridLength(0);
            VerticalView.Child = null;
            HorizontalView.Child = null;
        }

        public void WindowSizeChange()
        {
            if (VerticalView.Visibility == Visibility.Visible)
            {
                ViewToolGrid.ColumnDefinitions[2].Width = new GridLength(ViewToolGrid.ActualWidth * splitWidthScale);
            }
            if (HorizontalView.Visibility == Visibility.Visible)
            {
                ViewToolGrid.RowDefinitions[2].Height = new GridLength(ViewToolGrid.ActualHeight * splitHeightScale);
            }
        }

        private void PDFView_GotFocus(object sender, RoutedEventArgs e)
        {
            switch ((sender as Border).Tag)
            {
                case "ViewerTool":
                    FocusPDFViewTool = viewerTool;
                    break;
                case "SplitViewerTool":
                    FocusPDFViewTool = splitViewerTool;
                    break;
            }
            if (FocusPDFViewTool.IsLoaded)
            {
                FocusPDFViewToolChanged?.Invoke(this, EventArgs.Empty);
            }
        }

        #region Private Command Methods
        private double CheckZoomLevel(double zoom, bool IsGrowth)
        {
            zoom += (IsGrowth ? 0.01 : -0.01);
            double standardZoom = 100;
            if (zoom <= 0.01)
            {
                return 0.01;
            }
            if (zoom >= 10)
            {
                return 10;
            }

            zoom *= 100;
            for (int i = 0; i < zoomLevelList.Length - 1; i++)
            {
                if (zoom > zoomLevelList[i] && zoom <= zoomLevelList[i + 1] && IsGrowth)
                {
                    standardZoom = zoomLevelList[i + 1];
                    break;
                }
                if (zoom >= zoomLevelList[i] && zoom < zoomLevelList[i + 1] && !IsGrowth)
                {
                    standardZoom = zoomLevelList[i];
                    break;
                }
            }
            return standardZoom / 100;
        }

        #endregion

        #region automatic scroll
        internal bool EnableAutoScroll { get; set; } = true;

        private bool cancelTask = false;
        private bool scrollEnable = true;
        private bool isAutomaticScroll = false;
        private Point mouseCurrentPoint;
        private Point middlePressPoint;
        private Point middleMovePoint;
        private Task MiddleScrollTask;

        private void PDFView_MouseDown(object sender, MouseButtonEventArgs e)
        {

            switch ((sender as Border).Tag)
            {
                case "ViewerTool":
                    FocusPDFViewTool = viewerTool;
                    break;
                case "SplitViewerTool":
                    FocusPDFViewTool = splitViewerTool;
                    break;
            }
            if (FocusPDFViewTool.IsLoaded && FocusPDFViewTool.GetCPDFViewer()?.CurrentRenderFrame != null)
            {
                FocusPDFViewToolChanged?.Invoke(this, EventArgs.Empty);
            }
        }

        private void PDFViewControl_MouseMove(object sender, MouseEventArgs e)
        {
            if (isAutomaticScroll)
            {
                middleMovePoint = e.GetPosition(this);
                e.Handled = true;
                return;
            }
        }

        protected override void OnMouseDown(MouseButtonEventArgs e)
        {
            if (e.MiddleButton == MouseButtonState.Pressed)
            {
                isAutomaticScroll ^= true;
            }
            else
            {
                isAutomaticScroll = false;
            }

            if (isAutomaticScroll)
            {
                GetCPDFViewer().Cursor = Cursors.ScrollAll;
                middlePressPoint = e.GetPosition(this);
                middleMovePoint = middlePressPoint;

                if (MiddleScrollTask != null && MiddleScrollTask.Status == TaskStatus.Running)
                {
                    cancelTask = true;
                    MiddleScrollTask.Wait();
                }

                cancelTask = false;
                MiddleScrollTask = Task.Factory.StartNew(() => DoScrollWork());
            }
        }

        private void DoScrollWork()
        {
            try
            {
                while (!cancelTask && isAutomaticScroll)
                {
                    Vector subSize = middleMovePoint - middlePressPoint;
                    Dispatcher.Invoke(() =>
                    {
                        GetCPDFViewer().SetVerticalOffset(GetCPDFViewer().VerticalOffset + subSize.Y);
                        GetCPDFViewer().SetHorizontalOffset(GetCPDFViewer().HorizontalOffset + subSize.X);
                    });
                    Thread.Sleep(100);
                }
                Dispatcher.Invoke(() =>
                {
                    if (GetCPDFViewer().Cursor == Cursors.ScrollAll)
                    {
                        GetCPDFViewer().Cursor = Cursors.Arrow;
                    }
                });
            }
            catch (Exception ex)
            {
                MiddleScrollTask = null;
            }
        }

        #endregion
    }
}