inabox/InABox.DynamicGrid/DynamicGrid.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using InABox.Clients;
using InABox.Core;
using InABox.Scripting;
using InABox.WPF;
using NPOI.SS.Formula.Functions;
using Syncfusion.Data;
using Syncfusion.UI.Xaml.Grid;
using Syncfusion.UI.Xaml.Grid.Cells;
using Syncfusion.UI.Xaml.Grid.Helpers;
using Syncfusion.Windows.Controls.Cells;
using Syncfusion.Windows.Controls.Grid;
using Syncfusion.Windows.Shared;
using Syncfusion.Windows.Tools.Controls;
using Syncfusion.XPS;
using Color = System.Drawing.Color;
using DataRow = System.Data.DataRow;
using FilterElement = Syncfusion.UI.Xaml.Grid.FilterElement;
using Geometry = System.Windows.Media.Geometry;
using GridCellToolTipOpeningEventArgs = Syncfusion.UI.Xaml.Grid.GridCellToolTipOpeningEventArgs;
using GridFilterEventArgs = Syncfusion.UI.Xaml.Grid.GridFilterEventArgs;
using GridSelectionMode = Syncfusion.UI.Xaml.Grid.GridSelectionMode;
using Image = System.Windows.Controls.Image;
using Path = System.Windows.Shapes.Path;
using Point = System.Windows.Point;
using Resources = InABox.DynamicGrid.Properties.Resources;
using RowColumnIndex = Syncfusion.UI.Xaml.ScrollAxis.RowColumnIndex;
using SolidColorBrush = System.Windows.Media.SolidColorBrush;
using Transform = System.Windows.Media.Transform;
using VirtualizingCellsControl = Syncfusion.UI.Xaml.Grid.VirtualizingCellsControl;

namespace InABox.DynamicGrid
{
    public class TimeSpanToStringConverter : IValueConverter
    {
        public TimeSpanToStringConverter(string format)
        {
            Format = format;
        }

        public string Format { get; set; }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is TimeSpan time)
            {
                var result = string.IsNullOrWhiteSpace(Format) || string.Equals(Format, "hh:mm")
                    ? Math.Truncate(time.TotalHours).ToString("#00") + ":" + time.Minutes.ToString("D2")
                    : string.Format("{0:" + Format.Replace(":", "\\:") + "}", time);
                return result;
            }

            return "";
        }

        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }

    public class TimeSpanAggregate : ISummaryAggregate
    {
        public int Count { get; private set; }

        public TimeSpan Sum { get; private set; }

        public Action<IEnumerable, string, PropertyDescriptor> CalculateAggregateFunc()
        {
            return CalculateAggregate;
        }

        private void CalculateAggregate(IEnumerable items, string property, PropertyDescriptor args)
        {
            if(items is IEnumerable<DataRowView> rows)
            {
                if (string.Equals(args.Name, "Count"))
                {
                    Count = rows.Count();
                }
                else if (string.Equals(args.Name, "Sum"))
                {
                    Sum = new TimeSpan();
                    foreach (var row in rows)
                        if (row[property] is TimeSpan)
                            Sum += (TimeSpan)row[property];
                }
            }
            else
            {
                Logger.Send(LogType.Error, "", $"Attempting to caluculate aggregate on invalid data type '{items.GetType()}'.");
            }
        }
    }

    public class TimeSpanAggregateRenderer : GridTableSummaryCellRenderer
    {
        public override void OnUpdateEditBinding(DataColumnBase dataColumn, GridTableSummaryCell element, object dataContext)
        {
            if (DataGrid == null)
                return;

            var record = dataContext as SummaryRecordEntry;
            if (record == null || record.SummaryRow == null)
                return;

            foreach (var summaryColumn in record.SummaryRow.SummaryColumns)
            {
                if (!summaryColumn.MappingName.Equals(dataColumn.GridColumn.MappingName))
                    continue;

                var tsAgg = DataGrid != null
                    ? SummaryCreator.GetSummaryAggregate(summaryColumn, DataGrid.View) as TimeSpanAggregate
                    : null;
                if (tsAgg != null)
                {
                    var format = summaryColumn.Format.Replace("{", "").Replace("}", "").Split(':');
                    var cmd = format.FirstOrDefault();
                    var fmt = format.Length > 1 ? string.Join(":", format.Skip(1)) : "";

                    if (string.Equals(cmd, "Sum"))
                        element.Content = string.IsNullOrWhiteSpace(fmt) || string.Equals(fmt, "hh':'mm")
                            ? Math.Truncate(tsAgg.Sum.TotalHours).ToString("#00") + ":" + tsAgg.Sum.Minutes.ToString("D2")
                            : string.Format("{0:" + fmt.Replace(":", "\\:") + "}", tsAgg.Sum);


                    else if (string.Equals(summaryColumn.Format, "Count"))
                        element.Content = string.Format(fmt, tsAgg.Count);
                }
                else
                {
                    base.OnUpdateEditBinding(dataColumn, element, dataContext);
                }
            }
        }
    }

    public class NewDynamicGridStyle : DynamicGridStyle<VirtualizingCellsControl>
    {
        public NewDynamicGridStyle() : base(null)
        {
        }

        public NewDynamicGridStyle(IDynamicGridStyle source) : base(source)
        {
        }

        public override DependencyProperty FontSizeProperty => Control.FontSizeProperty;

        public override DependencyProperty FontStyleProperty => Control.FontStyleProperty;

        public override DependencyProperty FontWeightProperty => Control.FontWeightProperty;

        public override DependencyProperty BackgroundProperty => Control.BackgroundProperty;

        public override DependencyProperty ForegroundProperty => Control.ForegroundProperty;
    }

    public class GridSelectionControllerExt : GridSelectionController
    {
        public GridSelectionControllerExt(SfDataGrid datagrid)
            : base(datagrid)
        {
        }

        protected override void ProcessSelectedItemChanged(SelectionPropertyChangedHandlerArgs handle)
        {
            base.ProcessSelectedItemChanged(handle);
            if (handle.NewValue != null)
            {
                //this.DataGrid.ScrollInView(this.CurrentCellManager.CurrentRowColumnIndex);
                //int rowIndex = this.CurrentCellManager.CurrentRowColumnIndex.RowIndex;
                var columnIndex = CurrentCellManager.CurrentRowColumnIndex.ColumnIndex;
                var scrollRowIndex = DataGrid.GetVisualContainer().ScrollRows.LastBodyVisibleLineIndex;
                DataGrid.ScrollInView(new RowColumnIndex(scrollRowIndex, columnIndex));
            }
        }
    }

    public class DynamicGridSummaryStyleSelector : StyleSelector
    {
        private readonly IDynamicGrid _grid;

        public DynamicGridSummaryStyleSelector(IDynamicGrid grid)
        {
            _grid = grid;
        }

        public override Style SelectStyle(object item, DependencyObject container)
        {
            var vcol = ((GridTableSummaryCell)container).ColumnBase.ColumnIndex;
            var col = vcol > -1 && vcol < _grid.VisibleColumns.Count ? _grid.VisibleColumns[vcol] : null;

            var style = new Style(typeof(GridTableSummaryCell));
            style.Setters.Add(new Setter(Control.BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
            style.Setters.Add(new Setter(Control.ForegroundProperty, new SolidColorBrush(Colors.Black)));
            style.Setters.Add(new Setter(Control.HorizontalContentAlignmentProperty,
                col != null ? col.HorizontalAlignment(typeof(double)) : HorizontalAlignment.Right));
            style.Setters.Add(new Setter(Control.BorderBrushProperty, new SolidColorBrush(Colors.Gray)));
            style.Setters.Add(new Setter(Control.BorderThicknessProperty, new Thickness(0, 0, 0.75, 0)));
            style.Setters.Add(new Setter(Control.FontSizeProperty, 12D));
            style.Setters.Add(new Setter(Control.FontWeightProperty, FontWeights.DemiBold));
            return style;
        }
    }

// Used to render boolean columns (the default "false" value shows what appears to be an intermediate state, which is ugly
// This should show nothing for false, and a tick in a box for true
    public class BoolToImageConverter : IValueConverter
    {
        private static readonly BitmapImage tick = Resources.Bullet_Tick.AsBitmapImage();

        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value is bool boolean && boolean ? tick : null;
        }

        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }

    public class StringToColorImageConverter : IValueConverter
    {
        private readonly int _height = 50;
        private readonly int _width = 25;
        private readonly Dictionary<string, BitmapImage> cache = new();

        public StringToColorImageConverter(int width, int height)
        {
            _width = width;
            _height = height;
        }

        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var str = value?.ToString();
            if (str is null)
                return null;

            var colorcode = str.TrimStart('#');

            if (!cache.ContainsKey(colorcode))
            {
                var col = ImageUtils.StringToColor(colorcode);
                var bmp = ImageUtils.BitmapFromColor(col, _width, _height, Color.Black);
                cache[colorcode] = bmp.AsBitmapImage();
            }

            var result = cache[colorcode];
            return result;
        }


        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }

    public class StringArrayConverter : IValueConverter
    {
        object? IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if(value is string[] strArray)
            {
                return string.Join("\n", strArray);
            }
            Logger.Send(LogType.Error, "", $"Attempt to convert an object which is not a string array: {value}.");
            return null;
        }

        object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
    }

    public abstract class DynamicGrid<T> : BaseDynamicGrid<T> where T : BaseObject, new()
    {
        private readonly Dictionary<string, string> _filterpredicates = new();

        private UIElement? _header;
        private readonly Button Add;

        private bool bChanged;

        private bool bRefreshing;
        private readonly Label ClipboardSpacer;

        private readonly ContextMenu ColumnsMenu;
        private readonly Button Copy;

        private readonly Label Count;

        private readonly Button Cut;
        private readonly SfDataGrid DataGrid;

        private readonly Button Delete;
        private readonly DockPanel Docker;
        private readonly DynamicRowMovementColumn? down;
        private readonly Button Edit;
        private readonly Label EditSpacer;
        private readonly Button Export;
        private readonly Label ExportSpacer;
        private readonly Button DuplicateBtn;

        private readonly GridRowSizingOptions gridRowResizingOptions = new() { CanIncludeHiddenColumns = false, AutoFitMode = AutoFitMode.SmartFit };
        private readonly Button Help;
        private readonly Button Import;


        private T? inplaceeditor;

        private readonly Grid Layout;
        private readonly Label Loading;

        protected Dictionary<string, CoreTable> Lookups = new();
        private readonly Button MultiEdit;
        private readonly Button Paste;

        private readonly Button Print;
        private readonly Label PrintSpacer;

        private readonly StackPanel Stack;

        private readonly DynamicRowMovementColumn? up;

        private DataTable DataGridItems => (DataGrid.ItemsSource as DataTable)!;

        #region Events

        public event SelectItemHandler? OnSelectItem;

        public event OnDoubleClick? OnDoubleClick;

        public event OnCellDoubleClick? OnCellDoubleClick;

        public OnGridChanged? OnChanged;

        public event EditorValueChangedHandler? OnEditorValueChanged;

        public override event OnCustomiseEditor<T>? OnCustomiseEditor;

        public override event OnCustomiseColumns? OnCustomiseColumns;

        public override event OnFilterRecord? OnFilterRecord;

        #endregion

        public DynamicGrid() : base()
        {
            IsReady = false;

            Data = new CoreTable();

            ColumnsMenu = new ContextMenu();
            var SelectColumns = new MenuItem { Header = "Select Columns" };
            SelectColumns.Click += SelectColumnsClick;
            ColumnsMenu.Items.Add(SelectColumns);
            LoadColumnsMenu(ColumnsMenu);

            MasterColumns = new DynamicGridColumns();
            MasterColumns.ExtractColumns(typeof(T), "");

            foreach(var column in LookupFactory.RequiredColumns<T>().ColumnNames())
            {
                AddHiddenColumn(column);
            }

            ActionColumns = new DynamicActionColumns();

            if (IsSequenced)
            {
                up = new DynamicRowMovementColumn(DynamicRowMovement.Up, SwapRows);
                ActionColumns.Add(up);
                down = new DynamicRowMovementColumn(DynamicRowMovement.Down, SwapRows);
                ActionColumns.Add(down);
                HiddenColumns.Add(x => (x as ISequenceable)!.Sequence);
            }

            VisibleColumns = new DynamicGridColumns();

            DataGrid = new SfDataGrid();
            DataGrid.VerticalAlignment = VerticalAlignment.Stretch;
            DataGrid.HorizontalAlignment = HorizontalAlignment.Stretch;
            DataGrid.HeaderContextMenu = ColumnsMenu;
            DataGrid.CellTapped += DataGrid_CellTapped;
            DataGrid.CellDoubleTapped += DataGrid_CellDoubleTapped;
            DataGrid.SelectionMode = GridSelectionMode.Extended;
            DataGrid.SelectionUnit = GridSelectionUnit.Row;
            DataGrid.CanMaintainScrollPosition = true;

            DataGrid.NavigationMode = NavigationMode.Row;
            DataGrid.AllowEditing = false;
            DataGrid.EditTrigger = EditTrigger.OnTap;
            DataGrid.CurrentCellBeginEdit += DataGrid_CurrentCellBeginEdit;
            DataGrid.CurrentCellEndEdit += DataGrid_CurrentCellEndEdit;
            DataGrid.CurrentCellValueChanged += DataGrid_CurrentCellValueChanged;
            DataGrid.CurrentCellDropDownSelectionChanged += DataGrid_CurrentCellDropDownSelectionChanged;
            DataGrid.CurrentCellRequestNavigate += DataGrid_CurrentCellRequestNavigate;
            DataGrid.PreviewKeyUp += DataGrid_PreviewKeyUp;
            DataGrid.CurrentCellActivated += DataGrid_CurrentCellActivated;

            DataGrid.BorderBrush = new SolidColorBrush(Colors.Gray);
            DataGrid.BorderThickness = new Thickness(0.75F);
            DataGrid.Background = new SolidColorBrush(Colors.DimGray);
            DataGrid.AutoGenerateColumns = false;
            DataGrid.ColumnSizer = GridLengthUnitType.AutoLastColumnFill;
            DataGrid.SelectionForegroundBrush = BaseDynamicGrid.SelectionForeground;
            DataGrid.RowSelectionBrush = BaseDynamicGrid.SelectionBackground;
            
            DataGrid.CurrentCellBorderThickness = new Thickness(0);
            DataGrid.AllowFiltering = false;
            DataGrid.EnableDataVirtualization = true;
            DataGrid.RowHeight = 30;
            DataGrid.QueryRowHeight += DataGrid_QueryRowHeight;
            DataGrid.HeaderRowHeight = 30;

            DataGrid.MouseLeftButtonUp += DataGrid_MouseLeftButtonUp;
            DataGrid.MouseRightButtonUp += DataGrid_MouseRightButtonUp;
            DataGrid.KeyUp += DataGrid_KeyUp;
            DataGrid.PreviewGotKeyboardFocus += DataGrid_PreviewGotKeyboardFocus;
            //DataGrid.SelectionController = new GridSelectionControllerExt(DataGrid);

            DataGrid.FilterChanged += DataGrid_FilterChanged;

            DataGrid.FilterItemsPopulating += DataGrid_FilterItemsPopulating;

            var fltstyle = new Style(typeof(GridFilterControl));
            fltstyle.Setters.Add(new Setter(GridFilterControl.FilterModeProperty, FilterMode.Both));
            fltstyle.Setters.Add(new Setter(GridFilterControl.SortOptionVisibilityProperty, Visibility.Collapsed));
            DataGrid.FilterPopupStyle = fltstyle;

            DataGrid.RowStyleSelector = StyleSelector;
            DataGrid.TableSummaryCellStyleSelector = new DynamicGridSummaryStyleSelector(this);

            //DataGrid.MouseMove += DataGrid_MouseMove;
            DataGrid.CellToolTipOpening += DataGrid_CellToolTipOpening;

            //var headstyle = new Style(typeof(GridHeaderCellControl));
            //headstyle.Setters.Add(new Setter(GridHeaderCellControl.BackgroundProperty, new SolidColorBrush(Colors.WhiteSmoke)));
            //headstyle.Setters.Add(new Setter(GridHeaderCellControl.ForegroundProperty, new SolidColorBrush(Colors.Green)));
            //headstyle.Setters.Add(new Setter(GridHeaderCellControl.FontSizeProperty, 12.0F));
            //DataGrid.HeaderStyle = headstyle;

            DataGrid.SizeChanged += DataGrid_SizeChanged;
            DataGrid.SetValue(Grid.RowProperty, 1);

            Loading = new Label();
            Loading.Content = "Loading...";
            Loading.Foreground = new SolidColorBrush(Colors.White);
            Loading.VerticalContentAlignment = VerticalAlignment.Center;
            Loading.HorizontalContentAlignment = HorizontalAlignment.Center;
            Loading.Visibility = Visibility.Collapsed;
            Loading.SetValue(Panel.ZIndexProperty, 999);
            Loading.SetValue(Grid.RowProperty, 1);
            Loading.FontSize = 14.0F;
            Loading.Tag = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(50) };

            Help = CreateButton(Properties.Resources.help.AsBitmapImage(Color.White));
            Help.Margin = new Thickness(0, 2, 2, 0);
            Help.SetValue(DockPanel.DockProperty, Dock.Right);
            Help.Click += (o, e) => ShowHelp(typeof(T).Name.Split('.').Last().SplitCamelCase().Replace(" ","_"));

            Add = CreateButton(Properties.Resources.add.AsBitmapImage(Color.White));
            Add.Margin = new Thickness(0, 2, 2, 0);
            Add.Click += Add_Click;

            Edit = CreateButton(Properties.Resources.pencil.AsBitmapImage(Color.White));
            Edit.Margin = new Thickness(0, 2, 2, 0);
            Edit.Click += Edit_Click;

            MultiEdit = CreateButton(Properties.Resources.doc_xls.AsBitmapImage(Color.White));
            MultiEdit.Margin = new Thickness(0, 2, 2, 0);
            MultiEdit.Click += MultiEdit_Click;

            EditSpacer = new Label { Width = 5 };

            Print = CreateButton(Properties.Resources.print.AsBitmapImage(Color.White));
            Print.Margin = new Thickness(0, 2, 2, 0);
            Print.Click += (o, e) => DoPrint(o);

            PrintSpacer = new Label { Width = 5 };

            Cut = CreateButton(Properties.Resources.cut.AsBitmapImage(Color.White));
            Cut.Margin = new Thickness(0, 2, 2, 0);
            Cut.Click += Cut_Click;

            Copy = CreateButton(Properties.Resources.copy.AsBitmapImage(Color.White));
            Copy.Margin = new Thickness(0, 2, 2, 0);
            Copy.Click += Copy_Click;

            Paste = CreateButton(Properties.Resources.paste.AsBitmapImage(Color.White));
            Paste.Margin = new Thickness(0, 2, 2, 0);
            Paste.Click += Paste_Click;

            ClipboardSpacer = new Label { Width = 5 };

            Export = CreateButton(Properties.Resources.doc_xls.AsBitmapImage(Color.White), "Export");
            Export.Margin = new Thickness(0, 2, 2, 0);
            Export.Click += Export_Click;

            Import = CreateButton(Properties.Resources.doc_xls.AsBitmapImage(Color.White), "Import");
            Import.Margin = new Thickness(0, 2, 2, 0);
            Import.Click += Import_Click;

            ExportSpacer = new Label { Width = 5 };

            Stack = new StackPanel();
            Stack.Orientation = Orientation.Horizontal;
            Stack.SetValue(DockPanel.DockProperty, Dock.Left);

            Stack.Children.Add(Help);
            Stack.Children.Add(Add);
            Stack.Children.Add(Edit);
            Stack.Children.Add(MultiEdit);
            Stack.Children.Add(EditSpacer);

            Stack.Children.Add(Print);
            Stack.Children.Add(PrintSpacer);

            Stack.Children.Add(Cut);
            Stack.Children.Add(Copy);
            Stack.Children.Add(Paste);
            Stack.Children.Add(ClipboardSpacer);

            Stack.Children.Add(Export);
            Stack.Children.Add(Import);
            Stack.Children.Add(ExportSpacer);

            Delete = CreateButton(Properties.Resources.delete.AsBitmapImage(Color.White));
            Delete.Margin = new Thickness(0, 2, 0, 0);
            Delete.SetValue(DockPanel.DockProperty, Dock.Right);
            Delete.Click += Delete_Click;

            DuplicateBtn = AddButton("Duplicate", Properties.Resources.paste.AsBitmapImage(Color.White), DoDuplicate);

            Count = new Label();
            Count.Height = 30;
            Count.Margin = new Thickness(0, 2, 0, 0);
            Count.VerticalContentAlignment = VerticalAlignment.Center;
            Count.HorizontalContentAlignment = HorizontalAlignment.Center;
            Count.SetValue(DockPanel.DockProperty, Dock.Left);

            Docker = new DockPanel();

            Docker.SetValue(Grid.RowProperty, 2);
            Docker.SetValue(Grid.ColumnProperty, 0);
            Docker.Children.Add(Stack);
            Docker.Children.Add(Delete);
            Docker.Children.Add(Count);


            Layout = new Grid();
            Layout.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            Layout.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Auto) });
            Layout.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
            Layout.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Auto) });
            Layout.Children.Add(DataGrid);
            Layout.Children.Add(Loading);
            Layout.Children.Add(Docker);

            //Scroll.ApplyTemplate();

            Content = Layout;

            Options.Clear();
        }

        public bool IsReady { get; private set; }

        public UIElement? Header
        {
            get => _header;
            set
            {
                if (_header is not null && Layout.Children.Contains(_header))
                    Layout.Children.Remove(_header);
                _header = value;
                if(_header is not null)
                {
                    _header.SetValue(Grid.RowProperty, 0);
                    _header.SetValue(Grid.ColumnProperty, 0);
                    _header.SetValue(Grid.ColumnSpanProperty, 2);
                    Layout.Children.Add(_header);
                }
            }
        }

        /// <summary>
        /// Represents the data in the grid. This is <see langword="null"/> until <see cref="Refresh(bool, bool)"/> is called.
        /// </summary>
        public CoreTable? MasterData { get; set; }

        public DynamicActionColumns ActionColumns { get; }

        private bool IsSequenced => typeof(T).GetInterfaces().Any(x => x.Equals(typeof(ISequenceable)));

        public override double RowHeight
        {
            get => DataGrid.RowHeight;
            set => DataGrid.RowHeight = value;
        }

        public override double HeaderHeight
        {
            get => DataGrid.HeaderRowHeight;
            set => DataGrid.HeaderRowHeight = value;
        }

        protected override void OptionsChanged(object sender, EventArgs args)
        {
            ColumnsMenu.Visibility = Options.Contains(DynamicGridOption.SelectColumns) ? Visibility.Visible : Visibility.Hidden;
            Help.Visibility = Options.Contains(DynamicGridOption.ShowHelp) ? Visibility.Visible : Visibility.Collapsed;

            Add.Visibility = Options.Contains(DynamicGridOption.AddRows) ? Visibility.Visible : Visibility.Collapsed;
            Edit.Visibility = Options.Contains(DynamicGridOption.EditRows) ? Visibility.Visible : Visibility.Collapsed;
            MultiEdit.Visibility =
                Visibility.Collapsed; // _Options.Contains(DynamicGridOptions.DirectEdit) ? Visibility.Visible : Visibility.Collapsed;
            EditSpacer.Visibility = Options.Contains(DynamicGridOption.AddRows) || Options.Contains(DynamicGridOption.EditRows)
                ? Visibility.Visible
                : Visibility.Collapsed;

            Print.Visibility = Options.Contains(DynamicGridOption.Print) ? Visibility.Visible : Visibility.Collapsed;
            PrintSpacer.Visibility = Options.Contains(DynamicGridOption.Print) ? Visibility.Visible : Visibility.Collapsed;

            Cut.Visibility = IsSequenced ? Visibility.Visible : Visibility.Collapsed;
            Copy.Visibility = IsSequenced ? Visibility.Visible : Visibility.Collapsed;
            Paste.Visibility = IsSequenced ? Visibility.Visible : Visibility.Collapsed;
            ClipboardSpacer.Visibility = IsSequenced ? Visibility.Visible : Visibility.Collapsed;

            Export.Visibility = Options.Contains(DynamicGridOption.ExportData) ? Visibility.Visible : Visibility.Collapsed;
            Import.Visibility = Options.Contains(DynamicGridOption.ImportData) ? Visibility.Visible : Visibility.Collapsed;
            ExportSpacer.Visibility = Options.Contains(DynamicGridOption.ExportData) || Options.Contains(DynamicGridOption.ImportData)
                ? Visibility.Visible
                : Visibility.Collapsed;

            DataGrid.NavigationMode = Options.Contains(DynamicGridOption.DirectEdit) ? NavigationMode.Cell : NavigationMode.Row;
            DataGrid.AllowEditing = Options.Contains(DynamicGridOption.DirectEdit);

            Count.Visibility = Options.Contains(DynamicGridOption.RecordCount) ? Visibility.Visible : Visibility.Collapsed;

            Delete.Visibility = Options.Contains(DynamicGridOption.DeleteRows) ? Visibility.Visible : Visibility.Collapsed;
            DataGrid.AllowFiltering = Options.Contains(DynamicGridOption.FilterRows);
            DataGrid.FilterRowPosition = Options.Contains(DynamicGridOption.FilterRows) ? FilterRowPosition.FixedTop : FilterRowPosition.None;

            DataGrid.SelectionMode = Options.Contains(DynamicGridOption.MultiSelect) ? GridSelectionMode.Extended : GridSelectionMode.Single;
            if (up != null)
                up.Position = Options.Contains(DynamicGridOption.EditRows) ? DynamicActionColumnPosition.Start : DynamicActionColumnPosition.Hidden;
            if (down != null)
                down.Position = Options.Contains(DynamicGridOption.EditRows) ? DynamicActionColumnPosition.Start : DynamicActionColumnPosition.Hidden;

            if (DuplicateBtn != null)
                DuplicateBtn.Visibility = Visibility.Collapsed;
        }

        protected override DynamicGridStyleSelector<T> GetStyleSelector()
        {
            return new DynamicGridStyleSelector<T, NewDynamicGridStyle>();
        }

        protected override DynamicGridStyle GetStyle(CoreRow row, DynamicGridStyle style)
        {
            var result = base.GetStyle(row, style);
            if (ClipBuffer != null)
                if (ClipBuffer.Item2.Contains(row))
                {
                    var bgbrush = style.Background as SolidColorBrush;
                    var bgcolor = bgbrush != null ? bgbrush.Color : Colors.Transparent;

                    result = new NewDynamicGridStyle(style);

                    result.Background = ClipBuffer.Item1 == ClipAction.Cut
                        ? new SolidColorBrush(bgcolor.MixColors(0.5, Colors.Orchid))
                        : new SolidColorBrush(bgcolor.MixColors(0.5, Colors.LightGreen));

                    result.Foreground = new SolidColorBrush(Colors.Gray);
                    result.FontStyle = FontStyles.Italic;
                }

            return result;
        }

        private void DataGrid_CurrentCellActivated(object? sender, CurrentCellActivatedEventArgs e)
        {
            if (!Options.Contains(DynamicGridOption.DirectEdit))
                return;
            if (!DataGrid.SelectionController.CurrentCellManager.CurrentCell.IsEditing && e.ActivationTrigger == ActivationTrigger.Keyboard)
                DataGrid.SelectionController.CurrentCellManager.BeginEdit();
        }

        private void DataGrid_PreviewKeyUp(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.OemPeriod)
            {
                var editor = e.OriginalSource as TimeSpanEdit;
                if (editor != null && editor.SelectionStart < 2) editor.SelectionStart = 3;
            }
            else if (e.Key == Key.Tab)
            {
            }
            //throw new NotImplementedException();
        }

        private void DataGrid_CurrentCellRequestNavigate(object? sender, CurrentCellRequestNavigateEventArgs e)
        {
            //throw new NotImplementedException();
        }

        private void DataGrid_FilterChanged(object? o, GridFilterEventArgs e)
        {
            var col = DataGrid.Columns.IndexOf(e.Column);
            if (ColumnList[col] is DynamicActionColumn column)
            {
                if (e.FilterPredicates != null)
                {
                    var filter = e.FilterPredicates.Select(x => x.FilterValue.ToString()!).ToArray();
                    bool include = e.FilterPredicates.Any(x => x.FilterType == FilterType.Equals);
                    column.SelectedFilters = include ? filter : column.Filters.Except(filter).ToArray();
                }
                else
                    column.SelectedFilters = Array.Empty<string>();
                DataGrid.ClearFilter(e.Column);
                //e.FilterPredicates?.Clear();
                //e.FilterPredicates?.Add(new FilterPredicate() { PredicateType = PredicateType.Or, FilterBehavior = Syncfusion.Data.FilterBehavior.StringTyped, FilterMode = ColumnFilter.DisplayText, FilterType = Syncfusion.Data.FilterType.NotEquals, FilterValue = "" });
                //e.FilterPredicates?.Add(new FilterPredicate() { PredicateType = PredicateType.Or, FilterBehavior = Syncfusion.Data.FilterBehavior.StringTyped, FilterMode = ColumnFilter.DisplayText, FilterType = Syncfusion.Data.FilterType.Equals, FilterValue = "" });
                Refresh(false, false);
                e.Handled = true;
            }

            if (e.FilterPredicates == null)
            {
                if (_filterpredicates.ContainsKey(e.Column.MappingName))
                    _filterpredicates.Remove(e.Column.MappingName);
            }
            else
            {
                _filterpredicates[e.Column.MappingName] = Serialization.Serialize(e.FilterPredicates, true);
            }

            UpdateRecordCount();
        }

        private void DataGrid_FilterItemsPopulating(object? sender, GridFilterItemsPopulatingEventArgs e)
        {
            var col = DataGrid.Columns.IndexOf(e.Column);
            var column = ColumnList[col] as DynamicActionColumn;
            if (column != null)
                e.ItemsSource = column.Filters.Select(x => new FilterElement
                    { DisplayText = x, ActualValue = x, IsSelected = column.SelectedFilters == null || column.SelectedFilters.Contains(x) });
        }

        private CoreRow? GetRowFromIndex(int rowIndex)
        {
            var row = rowIndex - (Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1);
            if (row < 0)
                return null;
            row = DataGridItems.Rows.IndexOf((DataGrid.View.Records[row].Data as DataRowView)!.Row);
            if (row < 0)
                return null;
            return Data.Rows[row];
        }

        private void DataGrid_CellToolTipOpening(object? sender, GridCellToolTipOpeningEventArgs e)
        {
            if (ColumnList[e.RowColumnIndex.ColumnIndex] is not DynamicActionColumn col)
                return;
            var toolTip = col.ToolTip;
            if (toolTip is null)
                return;

            var row = GetRowFromIndex(e.RowColumnIndex.RowIndex);
            if (row is null)
                return;
            e.ToolTip.Template = TemplateGenerator.CreateControlTemplate(
                typeof(ToolTip),
                () => toolTip.Invoke(col, row)
            );
        }

        //private void DataGrid_MouseMove(object sender, MouseEventArgs e)
        //{
        //    var visualcontainer = DataGrid.GetVisualContainer();
        //    var point = e.GetPosition(visualcontainer);
        //    var rowColumnIndex = visualcontainer.PointToCellRowColumnIndex(point);
        //    var recordIndex = DataGrid.ResolveToRecordIndex(rowColumnIndex.RowIndex);

        //    if (recordIndex < 0)
        //        return;
        //    if (!rowColumnIndex.IsEmpty)
        //    {
        //        if (DataGrid.View.TopLevelGroup != null)
        //        {
        //            // Get the current row record while grouping
        //            var record = DataGrid.View.TopLevelGroup.DisplayElements[recordIndex];
        //            if (record.GetType() == typeof(RecordEntry))
        //            {
        //                var data = (record as RecordEntry).Data as CoreRow;
        //            }
        //        }

        //        else
        //        {
        //            //For getting the record, need to resolve the corresponding record index from row index                      
        //            var record1 = DataGrid.View.Records[DataGrid.ResolveToRecordIndex(rowColumnIndex.RowIndex)].Data;
        //        }
        //        //Gets the column from ColumnsCollection by resolving the corresponding column index from  GridVisibleColumnIndex                       
        //        var gridColumn = DataGrid.Columns[DataGrid.ResolveToGridVisibleColumnIndex(rowColumnIndex.ColumnIndex)];
        //        if (gridColumn is GridImageColumn)
        //        {

        //        }
        //    }

        //}

        protected virtual void LoadColumnsMenu(ContextMenu menu)
        {
        }

        private void DataGrid_CurrentCellBeginEdit(object? sender, CurrentCellBeginEditEventArgs e)
        {
            var headerrows = Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1;
            if (e.RowColumnIndex.RowIndex < headerrows)
                return;
            if (inplaceeditor == null)
                inplaceeditor = LoadItem(Data.Rows[e.RowColumnIndex.RowIndex - headerrows]);

            var column = DataGrid.Columns[e.RowColumnIndex.ColumnIndex] as GridComboBoxColumn;
            if (column != null && column.ItemsSource == null)
            {
                var colname = column.MappingName;
                var colno = DataGridItems.Columns.IndexOf(colname);
                var property = Data.Columns[colno].ColumnName;
                var prop = CoreUtils.GetProperty(typeof(T), property);
                var editor = prop.GetEditor();
                if (editor is ILookupEditor)
                {
                    if (!Lookups.ContainsKey(property))
                        Lookups[property] = ((ILookupEditor)editor).Values(property);
                    var combo = column;
                    combo.ItemsSource = Lookups[property].ToDictionary(Lookups[property].Columns[0].ColumnName, "Display");
                    combo.SelectedValuePath = "Key";
                    combo.DisplayMemberPath = "Value";
                }
            }

            bChanged = false;
        }

        private void DataGrid_CurrentCellValueChanged(object? sender, CurrentCellValueChangedEventArgs e)
        {
            var headerrows = Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1;
            if (e.RowColumnIndex.RowIndex < headerrows)
                return;
            if (e.Column is GridCheckBoxColumn)
                inplaceeditor = LoadItem(Data.Rows[e.RowColumnIndex.RowIndex - headerrows]);
            if(inplaceeditor is not null)
                UpdateData(inplaceeditor, e.RowColumnIndex.ColumnIndex);
            if (e.Column is GridCheckBoxColumn)
                inplaceeditor = null;
            if (inplaceeditor is not null)
                bChanged = true;
        }

        private void DataGrid_CurrentCellDropDownSelectionChanged(object? sender, CurrentCellDropDownSelectionChangedEventArgs e)
        {
            var headerrows = Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1;
            if (e.RowColumnIndex.RowIndex < headerrows)
                return;
            inplaceeditor ??= LoadItem(Data.Rows[e.RowColumnIndex.RowIndex - headerrows]);
            if (inplaceeditor != null)
                bChanged = true;
        }

        protected void UpdateCell(int row, string colname, object value)
        {
            var table = DataGridItems;
            var colno = table.Columns.IndexOf(colname);
            var corecol = Data.Columns[colno].ColumnName;
            var corerow = Data.Rows[row];
            corerow[corecol] = value;

            var datarow = table.Rows[row];
            datarow[colname] = value;
        }

        private void DataGrid_CurrentCellEndEdit(object? sender, CurrentCellEndEditEventArgs e)
        {
            var headerrows = Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1;
            if (e.RowColumnIndex.RowIndex < headerrows)
                return;
            if (inplaceeditor is not null && bChanged) UpdateData(inplaceeditor, e.RowColumnIndex.ColumnIndex);
            bChanged = false;
            inplaceeditor = null;
        }

        private void UpdateData(T obj, int columnindex)
        {
            var table = DataGridItems;

            var iRow = SelectedRows.First().Index; //e.RowColumnIndex.RowIndex - (Options.Contains(DynamicGridOptions.FilterRows) ? 2 : 1);
            var row = table.Rows[iRow];
            var colname = DataGrid.Columns[columnindex].MappingName;
            var value = row[colname];

            var colno = table.Columns.IndexOf(colname);
            var corecol = Data.Columns[colno].ColumnName;
            var corerow = Data.Rows[iRow];
            corerow[corecol] = value;

            CoreUtils.SetPropertyValue(obj, corecol, value);
            SaveItem(obj);
            Data.LoadRow(corerow, obj);

            foreach (var column in Data.Columns.Where(x => !string.Equals(corecol, x.ColumnName)))
            {
                var scol = column.ColumnName.Replace('.', '_');
                row[scol] = corerow[column.ColumnName];
            }

            for (var i = 0; i < ActionColumns.Count; i++) 
                row[string.Format("ActionColumn{0}", i)] = ActionColumns[i].Data(corerow);
        }

        private void DataGrid_QueryRowHeight(object? sender, QueryRowHeightEventArgs e)
        {
            if (e.RowIndex > 0)
            {
                e.Height = DataGrid.RowHeight;
                if (DataGrid.GridColumnSizer.GetAutoRowHeight(e.RowIndex, gridRowResizingOptions, out var autoHeight))
                    if (autoHeight > DataGrid.RowHeight)
                        e.Height = autoHeight;
                e.Handled = true;
            }
        }

        private void DataGrid_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            if (IsReady && !bRefreshing) ResizeColumns(DataGrid, e.NewSize.Width - 2, e.NewSize.Height - 2);
        }


        #region Row Selections

        protected CoreRow[] GetVisibleRows()
        {
            var items = DataGrid.ItemsSource;

            var result = new List<CoreRow>();

            var table = DataGridItems;
            var rows = DataGrid.View.Records.Select(x => (x.Data as DataRowView)!).ToList();
            foreach (var row in rows)
            {
                var iRow = table.Rows.IndexOf(row.Row);
                result.Add(Data.Rows[iRow]);
            }

            //foreach (var item in DataGrid.SelectedItems)
            //{
            //    if (item is CoreRow)
            //    {
            //        //result.Add(item as CoreRow);
            //    }
            //    else
            //    {
            //        var datarow = item as System.Data.DataRowView;
            //        int row = datarow.Row.Table.Rows.IndexOf(datarow.Row);
            //        result.Add(Data.Rows[row]);
            //    }
            //}
            return result.ToArray();
        }

        private CoreRow[] GetSelectedRows()
        {
            //Logger.Send(LogType.Information, ClientFactory.UserID, String.Format("{0}: GetSelectedRows({1})", this.GetType().EntityName(), DataGrid.SelectedItems.Count));
            var result = new List<CoreRow>();
            foreach (var item in DataGrid.SelectedItems)
                if (item is CoreRow)
                {
                    //result.Add(item as CoreRow);
                }
                else
                {
                    var datarow = item as DataRowView;
                    if (datarow != null)
                    {
                        var row = datarow.Row.Table.Rows.IndexOf(datarow.Row);
                        result.Add(Data.Rows[row]);
                    }
                }

            return result.ToArray();
        }

        private void SetSelectedRows(CoreRow[] rows)
        {
            //Logger.Send(LogType.Information, ClientFactory.UserID, String.Format("{0}: SetSelectedRows({1})", this.GetType().EntityName(), rows.Length));
            //   CoreTableAdapter<T> adapter = (CoreTableAdapter<T>)DataGrid.ItemsSource;             
            DataGrid.SelectedItems.Clear();
            var bFirst = true;
            foreach (var row in rows.Where(x => x.Index > -1))
            {
                //DataTable table = (DataTable)DataGrid.ItemsSource;
                if (bFirst || Options.Contains(DynamicGridOption.MultiSelect))
                    DataGrid.SelectedItems.Add(DataGrid.GetRecordAtRowIndex(row.Index + (Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1)));
                bFirst = false;
            }
        }

        public override CoreRow[] SelectedRows
        {
            get => GetSelectedRows();
            set => SetSelectedRows(value);
        }

        protected virtual void SelectItems(CoreRow[]? rows)
        {
            OnSelectItem?.Invoke(this, new DynamicGridSelectionEventArgs(rows));

            DuplicateBtn.Visibility =
                typeof(T).IsAssignableTo(typeof(IDuplicatable)) && rows != null && rows.Length >= 1 ? Visibility.Visible : Visibility.Collapsed;
        }

        private bool bFilterVisible;
        private bool bSwallowKey;

        private void DataGrid_PreviewGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            var bOld = bFilterVisible;
            if (e.NewFocus is GridFilterControl)
                bFilterVisible = true;
            else if (e.NewFocus is ScrollViewer || e.NewFocus is SfDataGrid)
                bFilterVisible = false;
            if (bOld && !bFilterVisible)
            {
                //Logger.Send(LogType.Information, "", String.Format("{0}: PreviewGotKeyboardFocus -> {1}", this.GetType().EntityName(), e.NewFocus.GetType().EntityName()));
                SelectItems(SelectedRows);
                bSwallowKey = true;
            }
        }

        private void DataGrid_KeyUp(object sender, KeyEventArgs e)
        {
            if (!bFilterVisible && !bSwallowKey && DataGrid.SelectedIndex > -1)
                //Logger.Send(LogType.Information, "", String.Format("{0}: KeyUp -> {1}", this.GetType().EntityName(), SelectedRows.Length));          
                SelectItems(SelectedRows);
            bSwallowKey = false;

            if (IsSequenced)
            {
                if (e.Key == Key.X && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
                {
                    CutToClipBuffer();
                }
                else if (e.Key == Key.C && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
                {
                    CopyToClipBuffer();
                }
                else if (e.Key == Key.V && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
                {
                    PasteFromClipBuffer();
                }
                else if (e.Key == Key.Escape)
                {
                    ResetClipBuffer();
                    InvalidateGrid();
                }
            }
        }

        private DispatcherTimer? clicktimer;

        private void StartTimer()
        {
            if (clicktimer is null)
            {
                clicktimer = new DispatcherTimer();
                clicktimer.Interval = TimeSpan.FromMilliseconds(200);
                clicktimer.Tick += (o, e) =>
                {
                    clicktimer.IsEnabled = false;
                    SelectItems(SelectedRows);
                };
            }

            clicktimer.IsEnabled = true;
        }

        private void StopTimer()
        {
            if (clicktimer is not null)
                clicktimer.IsEnabled = false;
        }

        private void DataGrid_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (!IsEnabled)
                return;

            var visualContainer = DataGrid.GetVisualContainer();
            var rowcolumnindex = visualContainer.PointToCellRowColumnIndex(e.GetPosition(visualContainer));
            var columnindex = DataGrid.ResolveToGridVisibleColumnIndex(rowcolumnindex.ColumnIndex);
            var column = ColumnList[columnindex] as DynamicActionColumn;
            var rowindex = rowcolumnindex.RowIndex - (Options.Contains(DynamicGridOption.FilterRows) ? 2 : 1);
            if (rowindex < 0)
                return;
            var row = Data.Rows[rowindex];
            var menu = column?.ContextMenu?.Invoke(SelectedRows);
            if (menu != null && menu.Items.Count > 0)
                menu.IsOpen = true;
        }

        private void DataGrid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (!IsEnabled)
                return;

            // Header Click Here!
            if (DataGrid.SelectedIndex == -1)
            {
                var visualContainer = DataGrid.GetVisualContainer();
                var rowcolumnindex = visualContainer.PointToCellRowColumnIndex(e.GetPosition(visualContainer));
                var columnindex = DataGrid.ResolveToGridVisibleColumnIndex(rowcolumnindex.ColumnIndex);

                if (columnindex > -1 && columnindex < ColumnList.Count)
                {
                    var bRefresh = false;
                    var dac = ColumnList[columnindex] as DynamicActionColumn;
                    if (dac != null)
                        if (dac.Action?.Invoke(null) == true)
                            bRefresh = true;
                    if (bRefresh)
                        Dispatcher.Invoke(() => { Refresh(false, true); });
                }
            }
            else if (!bFilterVisible)
            {
                StartTimer();
            }

            bSwallowKey = false;
        }


        private void DataGrid_CellTapped(object? sender, GridCellTappedEventArgs e)
        {
            if (!IsEnabled)
                return;

            var dac = ColumnList[e.RowColumnIndex.ColumnIndex] as DynamicActionColumn;
            if (dac != null)
            {
                var bRefresh = false;
                {
                    foreach (var row in SelectedRows)
                        if (dac.Action?.Invoke(row) == true)
                            bRefresh = true;
                }
                if (bRefresh)
                    Task.Run(() => { Dispatcher.Invoke(() => { Refresh(false, true); }); });
            }
            else
            {
                StartTimer();
            }
        }


        protected virtual void DoDoubleClick(object sender)
        {
            if (Options.Contains(DynamicGridOption.DirectEdit))
                return;

            SelectItems(SelectedRows);
            var args = new HandledEventArgs(false);
            OnDoubleClick?.Invoke(sender, args);
            if (args.Handled)
                return;
            if (Options.Contains(DynamicGridOption.EditRows))
                DoEdit();
        }

        private void DataGrid_CellDoubleTapped(object? sender, GridCellDoubleTappedEventArgs e)
        {
            StopTimer();

            if(OnCellDoubleClick is not null && ColumnList[e.RowColumnIndex.ColumnIndex] is DynamicGridColumn column)
            {
                var row = GetRowFromIndex(e.RowColumnIndex.RowIndex);
                var args = new DynamicGridCellClickEventArgs(row, column);
                OnCellDoubleClick?.Invoke(this, args);
                if (args.Handled)
                    return;
            }

            if (e.Record != null)
                DoDoubleClick(this);
        }

        #endregion

        #region Column Handling

        private readonly List<DynamicColumnBase> ColumnList = new();

        protected virtual DynamicGridColumns LoadColumns()
        {
            var result = new DynamicGridColumns();

            var cols = Options.Contains(DynamicGridOption.DirectEdit)
                ? new Columns<T>().Default(ColumnType.IncludeForeignKeys)
                : new Columns<T>().Default(ColumnType.IncludeLinked);
            result.AddRange(MasterColumns.Where(x => cols.Items.Any(c => c.Property.Equals(x.ColumnName)))
                .OrderBy(x => CoreUtils.GetPropertySequence(typeof(T), x.ColumnName)));
            return result;
        }

        private bool SwapRows(int row1, int row2)
        {

            CoreRow[] rows = Data.Rows.Where(x => x.Index.Equals(row1) || x.Index.Equals(row2)).ToArray();
            var items = LoadItems(rows);
            var first = (items.First() as ISequenceable)!;
            var last = (items.Last() as ISequenceable)!;
            var iBuf1 = first.Sequence;
            var iBuf2 = last.Sequence;
            first.Sequence = iBuf2;
            last.Sequence = iBuf1;
            SaveItems(items);
            return true;
        }

        protected virtual void SaveColumns(DynamicGridColumns columns)
        {
        }

        public override int DesiredWidth()
        {
            var result = 0;
            for (var i = 0; i < ColumnList.Count; i++)
            {
                var col = ColumnList[i];
                if (col is DynamicActionColumn)
                {
                    result += (int)RowHeight;
                }
                else if (col is DynamicGridColumn)
                {
                    var dgc = (DynamicGridColumn)col;
                    result += dgc.Width > 0 ? dgc.Width : 300;
                }
            }

            return result;
        }

        private void ResizeColumns(SfDataGrid grid, double width, double height)
        {
            if (Data == null || width <= 0)
                return;

            var fAvailWidth = width;

            //if (Data.Rows.Count * (DataGrid.RowHeight + 1) + DataGrid.HeaderRowHeight > height + 0.5F)
            if(height < DataGrid.AutoScroller.VScrollBar.Maximum)
                fAvailWidth -= (SystemParameters.VerticalScrollBarWidth+0.75);


            double fCurWidth = 0.0F;
            var NumAutoCols = 0;


            var colWidths = new Dictionary<int, double>();
            for (var i = 0; i < ColumnList.Count; i++)
            {
                var col = ColumnList[i];
                if (col is DynamicActionColumn dac)
                {
                    colWidths[i] = dac.Width == 0 ? RowHeight : dac.Width;
                    fCurWidth += colWidths[i];
                }
                else if (col is DynamicGridColumn dgc)
                {
                    colWidths[i] = dgc.Width;
                    if (dgc.Width != 0)
                        fCurWidth += Math.Max(0.0F, dgc.Width);
                    else
                        NumAutoCols++;
                }
            }

            if (NumAutoCols > 0)
            {
                var fAutoWidth = (fAvailWidth - fCurWidth) / NumAutoCols;
                if (fAutoWidth < 100)
                    fAutoWidth = 100;
                for (var i = 0; i < ColumnList.Count; i++)
                    if (colWidths[i] == 0)
                        colWidths[i] = fAutoWidth;
            }


            foreach (var index in colWidths.Keys)
                DataGrid.Columns[index].Width = Math.Max(0.0F, colWidths[index]);

            var vc = DataGrid.GetVisualContainer();
            vc.RowHeightManager.Reset();
            vc.InvalidateMeasureInfo();
            if (vc.ScrollOwner != null)
                vc.ScrollOwner.HorizontalScrollBarVisibility = vc.ExtentWidth <= fAvailWidth ? ScrollBarVisibility.Hidden : ScrollBarVisibility.Visible;
        }

        private void LoadActionColumns(DynamicActionColumnPosition position)
        {
            for (var i = 0; i < ActionColumns.Count; i++)
            {
                var column = ActionColumns[i];
                if (column.Position == position)
                {
                    //String sColName = String.Format("ActionColumn{0}{1}", i, position == DynamicActionColumnPosition.Start ? "L" : "R");
                    var sColName = string.Format("ActionColumn{0}", i);
                    gridRowResizingOptions.ExcludeColumns.Add(sColName);
                    
                    if (column is DynamicImageColumn imgcol)
                    {
                        var newcol = new GridImageColumn();
                        newcol.MappingName = sColName;
                        //newcol.Stretch = Stretch.Uniform;
                        newcol.Width = column.Width == 0 ? DataGrid.RowHeight : column.Width;
                        newcol.Padding = new Thickness(4);
                        newcol.ImageHeight = DataGrid.RowHeight - 8;
                        newcol.ImageWidth = DataGrid.RowHeight - 8;
                        newcol.ColumnSizer = GridLengthUnitType.None;
                        newcol.HeaderText = column.HeaderText;
                        
                        ApplyFilterStyle(newcol, true);
                        
                        newcol.ShowToolTip = column.ToolTip != null;
                        
                        var style = new Style();
                        style.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                        style.Setters.Add(new Setter(IsEnabledProperty, false));
                        newcol.FilterRowCellStyle = style;
                        
                        var headstyle = new Style(typeof(GridHeaderCellControl));
                        headstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                        headstyle.Setters.Add(new Setter(ForegroundProperty, new SolidColorBrush(Colors.Black)));
                        headstyle.Setters.Add(new Setter(FontSizeProperty, 12D));
                        if (!string.IsNullOrWhiteSpace(column.HeaderText))
                        {
                            //headstyle.Setters.Add(new Setter(LayoutTransformProperty, new RotateTransform(270.0F)));
                            headstyle.Setters.Add(new Setter(BorderThicknessProperty, new Thickness(0.0, 0.0, 0, 0)));
                            headstyle.Setters.Add(new Setter(MarginProperty, new Thickness(0, 0, 0.75, 0.75)));
                            headstyle.Setters.Add(new Setter(TemplateProperty,
                                Application.Current.Resources["VerticalColumnHeader"] as ControlTemplate));
                        }
                        else
                        {
                            var image = imgcol.Image?.Invoke(null);
                            if (image != null)
                            {
                                var template = new ControlTemplate(typeof(GridHeaderCellControl));
                                var border = new FrameworkElementFactory(typeof(Border));
                                border.SetValue(Border.BackgroundProperty, new SolidColorBrush(Colors.Gainsboro));
                                border.SetValue(Border.PaddingProperty, new Thickness(4));
                                border.SetValue(MarginProperty, new Thickness(0, 0, 1, 1));
                                var img = new FrameworkElementFactory(typeof(Image));
                                img.SetValue(Image.SourceProperty, image);
                                border.AppendChild(img);
                                template.VisualTree = border;
                                headstyle.Setters.Add(new Setter(TemplateProperty, template));
                            }
                        }

                        newcol.HeaderStyle = headstyle;

                        DataGrid.Columns.Add(newcol);
                        ColumnList.Add(column);
                    }
                    else if (column is DynamicTextColumn txtCol)
                    {
                        
                        var newcol = new GridTextColumn();
                        gridRowResizingOptions.ExcludeColumns.Add(sColName);
                        newcol.TextWrapping = TextWrapping.NoWrap;
                        
                        newcol.TextAlignment = txtCol.Alignment == Alignment.NotSet
                            ? TextAlignment.Left
                            : txtCol.Alignment == Alignment.BottomLeft || txtCol.Alignment == Alignment.MiddleLeft ||
                              txtCol.Alignment == Alignment.TopLeft
                                ? TextAlignment.Left
                                : txtCol.Alignment == Alignment.BottomCenter || txtCol.Alignment == Alignment.MiddleCenter ||
                                  txtCol.Alignment == Alignment.TopCenter
                                    ? TextAlignment.Center
                                    : TextAlignment.Right;
                        
                        newcol.AllowEditing = false;
                        newcol.UpdateTrigger = UpdateSourceTrigger.PropertyChanged;
                        newcol.MappingName = sColName;
                        newcol.Width = column.Width == 0 ? DataGrid.RowHeight : column.Width;
                        newcol.ColumnSizer = GridLengthUnitType.None;
                        newcol.HeaderText = column.HeaderText;
                        newcol.AllowFiltering = column.Filters != null && column.Filters.Any();
                        newcol.AllowSorting = false;
                        newcol.FilterRowOptionsVisibility = Visibility.Collapsed;
                        newcol.ShowToolTip = column.ToolTip != null;
                        
                        var style = new Style();
                        style.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                        style.Setters.Add(new Setter(IsEnabledProperty, false));
                        newcol.FilterRowCellStyle = style;
                        
                        var headstyle = new Style(typeof(GridHeaderCellControl));
                        headstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                        headstyle.Setters.Add(new Setter(ForegroundProperty, new SolidColorBrush(Colors.Black)));
                        headstyle.Setters.Add(new Setter(FontSizeProperty, 12D));
                        newcol.HeaderStyle = headstyle;

                        DataGrid.Columns.Add(newcol);
                        ColumnList.Add(column);                        
                    }

                    
                }
            }
        }

        private bool CanSort()
        {
            return !IsSequenced;
        }

        private void ReloadColumns()
        {

            ConfigureColumns(MasterColumns /*, false */);

            VisibleColumns = LoadColumns();

            ConfigureColumns(VisibleColumns /*, true */);

            DataGrid.Columns.Suspend();

            ColumnList.Clear();
            DataGrid.Columns.Clear();
            DataGrid.TableSummaryRows.Clear();
            var Summaries = new ObservableCollection<ISummaryColumn>();

            gridRowResizingOptions.ExcludeColumns = new List<string>();

            LoadActionColumns(DynamicActionColumnPosition.Start);

            foreach (var column in VisibleColumns)
            {
                var filtering = true;
                IProperty? prop;
                try
                {
                    prop = DatabaseSchema.Property(typeof(T), column.ColumnName);
                }
                catch (Exception e)
                {
                    Logger.Send(LogType.Error, ClientFactory.UserID,
                        string.Format("Error constructing Column [{0}] : {1}\n{2}", column.ColumnName, e.Message, e.StackTrace));
                    prop = null;
                }

                if (prop != null)
                {
                    var scolname = column.ColumnName.Replace('.', '_');

                    GridColumn newcol;
                    if (prop.PropertyType.IsNumeric())
                    {
                        var digits = 0;
                        var prefix = "N";
                        if (column.Editor is CurrencyEditor currencyEditor)
                        {
                            var curcol = new GridCurrencyColumn();
                            if (!prop.PropertyType.IsOrdinal())
                            {
                                var format = string.IsNullOrWhiteSpace(column.Format) ? "" : column.Format.Replace("C", "");
                                if (!int.TryParse(format, out digits))
                                    digits = currencyEditor.Digits;
                            }

                            curcol.CurrencyDecimalDigits = digits;
                            curcol.CurrencyGroupSeparator = ",";
                            curcol.CurrencyGroupSizes = new Int32Collection(new[] { 3, 3, 3, 3, 3, 3 });
                            prefix = "C";
                            newcol = curcol;
                        }
                        else
                        {
                            var numcol = new GridNumericColumn();

                            if (!prop.PropertyType.IsOrdinal())
                            {
                                var format = string.IsNullOrWhiteSpace(column.Format) ? "" : column.Format.Replace("F", "");
                                if (!int.TryParse(format, out digits))
                                    digits = column.Editor is DoubleEditor doubleEditor ? doubleEditor.Digits : 0;
                                numcol.NumberDecimalDigits = digits;
                                numcol.NumberGroupSeparator = ",";
                                numcol.NumberGroupSizes = new Int32Collection(new[] { 3, 3, 3, 3, 3, 3 });
                            }
                            else
                            {
                                numcol.NumberGroupSeparator = "";
                                numcol.NumberDecimalDigits = 0;
                            }

                            prefix = "N";
                            newcol = numcol;
                        }

                        if (prop.Editor.Summary != Summary.None)
                        {
                            var summary = new GridSummaryColumn
                            {
                                Name = scolname,
                                Format = "{" + (prop.Editor.Summary == Summary.Sum ? "Sum" : "Count") + ":" +
                                         string.Format("{0}{1}", prefix, digits) +
                                         "}",
                                MappingName = scolname,
                                SummaryType = prop.Editor.Summary == Summary.Sum
                                    ? prop.PropertyType.IsOrdinal() ? SummaryType.Int32Aggregate : SummaryType.DoubleAggregate
                                    : SummaryType.CountAggregate
                            };
                            Summaries.Add(summary);
                        }
                    }
                    else if (prop.PropertyType == typeof(DateTime))
                    {
                        newcol = new GridDateTimeColumn
                        {
                            CustomPattern = column.Format,
                            Pattern = !string.IsNullOrWhiteSpace(column.Format) ? DateTimePattern.CustomPattern : DateTimePattern.ShortDate
                        };
                    }
                    else if (prop.PropertyType == typeof(TimeSpan))
                    {
                        newcol = new GridTimeSpanColumn
                        {
                            DisplayBinding = new Binding
                            {
                                Path = new PropertyPath(scolname),
                                Converter = new TimeSpanToStringConverter(column.Format)
                            },
                            Format = column.Format, //.Replace(":", "':'"),
                            ShowArrowButtons = false
                        };
                        filtering = false;
                        if (prop.Editor != null && prop.Editor.Summary != Summary.None)
                        {
                            var summary = new GridSummaryColumn
                            {
                                Name = scolname,
                                Format = "{" + (prop.Editor.Summary == Summary.Sum
                                    ? "Sum" + (string.IsNullOrWhiteSpace(column.Format) ? "" : ":" + column.Format.Replace(":", "':'"))
                                    : prop.Editor.Summary == Summary.Count
                                        ? "Count"
                                        : "") + "}",
                                MappingName = scolname,
                                SummaryType = prop.Editor.Summary == Summary.Sum ? SummaryType.Custom : SummaryType.CountAggregate,
                                CustomAggregate = new TimeSpanAggregate()
                            };
                            Summaries.Add(summary);
                        }
                    }
                    else if (prop.PropertyType == typeof(bool))
                    {
                        if (Options.Contains(DynamicGridOption.DirectEdit))
                        {
                            var checkcol = new GridCheckBoxColumn
                            {
                                ValueBinding = new Binding
                                {
                                    Path = new PropertyPath(scolname)
                                },
                                IsThreeState = false
                            };
                            newcol = checkcol;
                        }
                        else
                        {
                            var imgcol = new GridImageColumn
                            {
                                ValueBinding = new Binding
                                {
                                    Path = new PropertyPath(scolname),
                                    Converter = new BoolToImageConverter()
                                },
                                ImageHeight = DataGrid.RowHeight - 8,
                                ImageWidth = DataGrid.RowHeight - 8,
                                Padding = new Thickness(4)
                            };
                            newcol = imgcol;
                        }

                        gridRowResizingOptions.ExcludeColumns.Add(scolname);
                        filtering = false;
                    }
                    else if (prop.Editor is ColorEditor)
                    {
                        var imgcol = new GridImageColumn
                        {
                            ValueBinding = new Binding
                            {
                                Path = new PropertyPath(scolname),
                                Converter = new StringToColorImageConverter(column.Width - 8, (int)DataGrid.RowHeight - 8)
                            },
                            ImageHeight = DataGrid.RowHeight - 8,
                            ImageWidth = column.Width - 8,
                            Padding = new Thickness(4)
                        };
                        gridRowResizingOptions.ExcludeColumns.Add(scolname);
                        newcol = imgcol;
                        filtering = false;
                    }
                    else if (prop.Editor is ILookupEditor lookupEditor)
                    {
                        var lookupcol = new GridComboBoxColumn();

                        //var lookups = editor.Values(column.ColumnName).ToDictionary(column.ColumnName, "Display");
                        //lookupcol.SelectedValuePath = "Key";
                        //lookupcol.DisplayMemberPath = "Value";
                        //lookupcol.ItemsSource = lookups;

                        var table = lookupEditor.Values(column.ColumnName).ToDataTable();
                        lookupcol.SelectedValuePath = table.Columns[0].ColumnName;
                        lookupcol.DisplayMemberPath = "Display";
                        lookupcol.ItemsSource = table.DefaultView;

                        newcol = lookupcol;
                    }
                    else
                    {
                        var textcol = new GridTextColumn();
                        if (!(prop.Editor is MemoEditor))
                            gridRowResizingOptions.ExcludeColumns.Add(scolname);
                        textcol.TextWrapping = TextWrapping.NoWrap;
                        newcol = textcol;
                        if (prop.PropertyType == typeof(string[]))
                            newcol.DisplayBinding = new Binding { Path = new PropertyPath(scolname), Converter = new StringArrayConverter() };
                        textcol.AllowEditing = Options.Contains(DynamicGridOption.DirectEdit);
                        textcol.UpdateTrigger = UpdateSourceTrigger.PropertyChanged;
                    }

                    DataGrid.SummaryCalculationUnit = SummaryCalculationUnit.AllRows;
                    DataGrid.LiveDataUpdateMode = LiveDataUpdateMode.AllowSummaryUpdate;
                    newcol.MappingName = scolname;

                    newcol.Width = column.Width; // != 0 ? column.Width : double.NaN;

                    newcol.ColumnSizer =
                        GridLengthUnitType.None; //column.Width != 0 ? GridLengthUnitType.None : GridLengthUnitType.AutoWithLastColumnFill;
                    newcol.HeaderText = string.IsNullOrWhiteSpace(column.Caption) ? column.ColumnName : column.Caption;

                    newcol.TextAlignment = column.Alignment == Alignment.NotSet
                        ? prop.PropertyType.IsNumeric() ? TextAlignment.Right : TextAlignment.Left
                        : column.Alignment == Alignment.BottomLeft || column.Alignment == Alignment.MiddleLeft ||
                          column.Alignment == Alignment.TopLeft
                            ? TextAlignment.Left
                            : column.Alignment == Alignment.BottomCenter || column.Alignment == Alignment.MiddleCenter ||
                              column.Alignment == Alignment.TopCenter
                                ? TextAlignment.Center
                                : TextAlignment.Right;

                    newcol.HorizontalHeaderContentAlignment = newcol.TextAlignment == TextAlignment.Left ? HorizontalAlignment.Left
                        : newcol.TextAlignment == TextAlignment.Center ? HorizontalAlignment.Center
                        : HorizontalAlignment.Right;


                    ApplyFilterStyle(newcol,filtering);


                    var headstyle = new Style(typeof(GridHeaderCellControl));
                    headstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                    headstyle.Setters.Add(new Setter(ForegroundProperty, new SolidColorBrush(Colors.Black)));
                    headstyle.Setters.Add(new Setter(FontSizeProperty, 12D));
                    newcol.HeaderStyle = headstyle;

                    var cellstyle = new Style();
                    if (Options.Contains(DynamicGridOption.DirectEdit))
                    {
                        if (prop.Editor is null || prop.Editor.Editable != Editable.Enabled)
                        {
                            cellstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.WhiteSmoke)));
                            newcol.AllowEditing = false;
                        }
                        else
                        {
                            cellstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.LightYellow)));
                            newcol.AllowEditing = true;
                        }

                        cellstyle.Setters.Add(new Setter(ForegroundProperty, new SolidColorBrush(Colors.Black)));

                        newcol.CellStyle = cellstyle;
                    }

                    DataGrid.Columns.Add(newcol);
                    ColumnList.Add(column);
                }
            }

            LoadActionColumns(DynamicActionColumnPosition.End);

            if (Summaries.Any())
            {
                DataGrid.CellRenderers.Remove("TableSummary");
                DataGrid.CellRenderers.Add("TableSummary", new TimeSpanAggregateRenderer());

                DataGrid.TableSummaryRows.Add(new GridTableSummaryRow
                {
                    ShowSummaryInRow = false,
                    Position = TableSummaryRowPosition.Bottom,
                    SummaryColumns = Summaries
                });
            }

            DataGrid.Columns.Resume();
            DataGrid.RefreshColumns();
            
            foreach (var key in _filterpredicates.Keys.ToArray())
                if (DataGrid.Columns.Any(x => string.Equals(x.MappingName, key)))
                {
                    var predicates = Serialization.Deserialize<List<FilterPredicate>>(_filterpredicates[key]);
                    foreach (var predicate in predicates)
                    {
                        DataGrid.Columns[key].FilterPredicates.Add(predicate);
                        DataGrid.Columns[key].FilteredFrom = FilteredFrom.FilterRow;
                    }
                }
                else
                {
                    _filterpredicates.Remove(key);
                }

            ResizeColumns(DataGrid, DataGrid.ActualWidth - 2, DataGrid.ActualHeight - 2);
        }

        private void ApplyFilterStyle(GridColumn column, bool filtering)
        {
            var filterstyle = new Style();
            if (filtering)
            {
                filterstyle.Setters.Add(new Setter(BackgroundProperty, BaseDynamicGrid.FilterBackground));
                column.ImmediateUpdateColumnFilter = true;
                column.ColumnFilter = ColumnFilter.Value;
                column.FilterRowCondition = FilterRowCondition.Contains;
                column.FilterRowOptionsVisibility = Visibility.Collapsed;
                column.AllowBlankFilters = true;
                column.AllowSorting = CanSort();
            }
            else
            {
                filterstyle.Setters.Add(new Setter(BackgroundProperty, new SolidColorBrush(Colors.Gainsboro)));
                filterstyle.Setters.Add(new Setter(IsEnabledProperty, false));
                column.ColumnFilter = ColumnFilter.Value;
                column.AllowFiltering = false;
                column.AllowSorting = false;
                column.FilterRowEditorType = "TextBox";
                column.FilterRowOptionsVisibility = Visibility.Collapsed;
            }

            column.FilterRowCellStyle = filterstyle;
        }

        #endregion

        #region Refresh / Reload

        protected abstract void Reload(Filters<T> criteria, Columns<T> columns, ref SortOrder<T>? sort, Action<CoreTable?, Exception?> action);

        protected virtual bool FilterRecord(CoreRow row)
        {
            var bOK = true;
            foreach (var column in ActionColumns.Where(x => x.FilterRecord != null && x.SelectedFilters != null && x.SelectedFilters.Any()))
                bOK = bOK && column.FilterRecord.Invoke(row, column.SelectedFilters);
            if (bOK && OnFilterRecord is not null)
                bOK = OnFilterRecord(row);
            return bOK;
        }


        public override void Refresh(bool reloadcolumns, bool reloaddata)
        {
            //DataGrid.View.Filter = DoFilterRecord;

            if (bRefreshing)
                return;
            
            DataGrid.SelectionForegroundBrush = BaseDynamicGrid.SelectionForeground;
            DataGrid.RowSelectionBrush = BaseDynamicGrid.SelectionBackground;

            var cursor = UseWaitCursor ? new WaitCursor() : null;

            Loading.Visibility = Visibility.Visible;
            double opacity = 1.0F;
            var bFading = true;
            var timer = (DispatcherTimer)Loading.Tag;
            Loading.Tag = timer;
            timer.Tick += (o, e) =>
            {
                if (bFading)
                    opacity -= 0.05F;
                else
                    opacity += 0.05F;
                if (opacity >= 1.0F)
                {
                    opacity = 1.0F;
                    bFading = true;
                }
                else if (opacity <= 0.2F)
                {
                    opacity = 0.2F;
                    bFading = false;
                }

                Loading.Opacity = opacity;
            };
            timer.IsEnabled = true;

            bRefreshing = true;

            // Yo, please don't remove this.
            // The issue was when we were dynamically adding ActionColumns, and if we had to remove and then re-add them, we were getting massive performance hits
            // for no reason. I think perhaps the image columns were trying to refer to data that didn't exist anymore when calling DataGrid.Columns.Refresh(),
            // and thus some mega problems (perhaps even exceptions within Syncfusion) were occurring, and this seems to fix it.
            // I don't pretend to know why it works; this is probably the strangest problem I've ever come across.
            DataGrid.ItemsSource = null;

            //using (var d = Dispatcher.DisableProcessing())
            {
                if (reloadcolumns) 
                    ReloadColumns();

                if (reloaddata)
                {
                    _lookupcache.Clear();

                    var criteria = new Filters<T>();
                    var filter = DefineFilter();
                    if (filter != null)
                        criteria.Add(filter);

                    var columns = DataColumns();

                    var sort = LookupFactory.DefineSort<T>();
                    if (sort == null && IsSequenced)
                        sort = new SortOrder<T>("Sequence");

                    Reload(
                        criteria
                        , columns
                        , ref sort
                        , (table, exception) =>
                        {
                            if (exception != null)
                            {
                                Dispatcher.Invoke(() =>
                                {
                                    MessageBox.Show(String.Format("Error: {0}", exception.Message));
                                });                                
                            }
                            else if(table is not null)
                            {
                                MasterData = table;
                                Dispatcher.Invoke(() =>
                                {
                                    ProcessData(reloadcolumns, reloaddata);
                                    DoAfterReload();
                                });
                            }
                        }
                    );
                }
                else
                {
                    ProcessData(reloadcolumns, reloaddata);
                    DoAfterReload();
                }
            }

            bRefreshing = false;
            IsReady = true;

            if (cursor != null)
            {
                cursor.Dispose();
                cursor = null;
            }
        }

        public Columns<T> DataColumns()
        {
            var columns = new Columns<T>();
            foreach (var column in VisibleColumns)
                columns.Add(column.ColumnName);
            foreach (var column in HiddenColumns)
                columns.Add(column);
            return columns;
        }


        private void ProcessData(bool reloadcolumns, bool reloaddata)
        {
            Data.Columns.Clear();
            Data.Setters.Clear();
            if (MasterData != null)
                foreach (var column in MasterData.Columns)
                    Data.Columns.Add(column);

            FilterRows();
        }

        private readonly Dictionary<CoreRow, CoreRow> _recordmap = new();

        public override void UpdateRow<TRow, TType>(CoreRow row, Expression<Func<TRow, TType>> column, TType value, bool refresh = true)
        {
            row.Set(column, value);
            _recordmap[row].Set(column, value);
            if (refresh)
                InvalidateRow(row);
        }

        public override void UpdateRow<TType>(CoreRow row, string column, TType value, bool refresh = true)
        {
            row.Set(column, value);
            _recordmap[row].Set(column, value);
            if (refresh)
                InvalidateRow(row);
        }


        public void AddRow(CoreRow row)
        {
            if (MasterData is null) return;

            var masterrow = MasterData.NewRow();
            MasterData.LoadRow(masterrow, row);
            Refresh(false, false);
        }

        public void AddRow(T data)
        {
            if (MasterData is null) return;

            var masterrow = MasterData.NewRow();
            MasterData.LoadRow(masterrow, data);
            MasterData.Rows.Add(masterrow);
            Refresh(false, false);
        }

        public void DeleteRow(CoreRow row)
        {
            if (MasterData is null) return;

            var masterrow = _recordmap[row];
            MasterData.Rows.Remove(masterrow);
            Refresh(false, false);
        }

        private void FilterRows()
        {
            ResetClipBuffer();
            Data.Rows.Clear();
            _recordmap.Clear();
            if (MasterData is null)
                return;
            foreach (var row in MasterData.Rows)
                if (FilterRecord(row))
                {
                    var newrow = Data.NewRow();
                    for (var i = 0; i < Data.Columns.Count; i++)
                    {
                        var value = i < row.Values.Count ? row.Values[i] : null;
                        if (Data.Columns[i].DataType.IsNumeric())
                            value = Data.Columns[i].DataType.IsDefault(value) ? null : value;
                        //else if (Data.Columns[i].DataType == typeof(String[]))
                        //    value = String.Join("\n", value as String[]);
                        newrow.Values.Add(value);
                    }

                    //newrow.Values.AddRange(row.Values);
                    //if ((OnFilterRecord == null) || (OnFilterRecord(row)))
                    Data.Rows.Add(newrow);
                    _recordmap[newrow] = row;
                }


            InvalidateGrid();

            //ScrollBar.Value = _CurrentRow <= 0 ? 0 : _CurrentRow;
            SelectedRows = new CoreRow[] { };
        }

        //IncrementalList<T> _data = null;

        private void InvalidateRow(CoreRow row)
        {
            var rowdata = new List<object?>(row.Values);
            foreach (var ac in ActionColumns)
                rowdata.Add(ac.Data(row));

            var datarow = DataGridItems.Rows[row.Index];
            for (var i = 0; i < rowdata.Count; i++)
                datarow[i] = rowdata[i] ?? DBNull.Value;
            //datarow.ItemArray = rowdata.ToArray(); 
        }

        private void InvalidateGrid()
        {
            var defaults = new List<object?>();
            var result = new DataTable();

            foreach (var column in Data.Columns)
            {
                var colname = column.ColumnName.Replace('.', '_');
                if (!result.Columns.Contains(colname))
                {
                    result.Columns.Add(colname, column.DataType);
                    if (!Options.Contains(DynamicGridOption.DirectEdit))
                        defaults.Add(column.DataType.GetDefault());
                }
            }

            for (var i = 0; i < ActionColumns.Count; i++)
                result.Columns.Add(string.Format("ActionColumn{0}", i), 
                    ActionColumns[i] is DynamicImageColumn 
                        ? typeof(BitmapImage) 
                        : typeof(String)
                );

            foreach (var row in Data.Rows)
            {
                var newrow = result.NewRow();
                CoreRowToDataRow(newrow, row, defaults);
                result.Rows.Add(newrow);
            }

            if (StyleSelector != null)
                StyleSelector.Data = Data;
            //int rowIndex = DataGrid.SelectionController.CurrentCellManager.CurrentRowColumnIndex.RowIndex;
            //int columnIndex = DataGrid.SelectionController.CurrentCellManager.CurrentRowColumnIndex.ColumnIndex;
            //int scrollRowIndex = DataGrid.GetVisualContainer().ScrollRows.LastBodyVisibleLineIndex;
            DataGrid.ItemsSource = result;
            //this.DataGrid.ScrollInView(new Syncfusion.UI.Xaml.ScrollAxis.RowColumnIndex(scrollRowIndex, columnIndex));
            ResizeColumns(DataGrid, DataGrid.ActualWidth - 1, DataGrid.ActualHeight);

            UpdateRecordCount();

            Loading.Visibility = Visibility.Collapsed;
            var timer = (DispatcherTimer)Loading.Tag;
            timer.IsEnabled = false;
        }

        private void UpdateRecordCount()
        {
            var count = DataGrid.View != null ? DataGrid.View.Records.Count : Data.Rows.Count;
            Count.Content = string.Format("{0} Records", count);
            //Count.Visibility = _Options.Contains(DynamicGridOptions.RecordCount) && (count > 0) ? Visibility.Visible : Visibility.Collapsed;
        }

        public IList<CoreRow> FilteredRows()
        {
            var result = new List<CoreRow>();
            var table = DataGridItems;
            var rows = DataGrid.View.Records.Select(x => (x.Data as DataRowView)!).ToList();
            foreach (var row in rows)
            {
                var iRow = table.Rows.IndexOf(row.Row);
                result.Add(Data.Rows[iRow]);
            }

            return result;
        }

        // Doesn't appear to be used - removed 19/12/2022
        /*private object?[] CreateRowValues(CoreRow row, List<object> defaults)
        {
            var rowdata = new List<object?>(row.Values);
            foreach (var ac in ActionColumns)
                rowdata.Add(ac.Image.Invoke(row));
            var result = ProcessRow(rowdata, defaults);
            return result.ToArray();
        }*/

        private void CoreRowToDataRow(DataRow newrow, CoreRow row, List<object?> defaults)
        {
            var rowdata = new List<object?>(row.Values);
            foreach (var ac in ActionColumns)
                rowdata.Add(ac.Data(row));

            try
            {
                var data = ProcessRow(rowdata, defaults).ToArray();
                newrow.ItemArray = data;
            }
            catch (Exception)
            {
                throw;
            }
        }

        private static IEnumerable<object?> ProcessRow(List<object?> values, List<object?> defaults)
        {
            if (defaults == null || !defaults.Any())
                return values;
            var result = new List<object?>();
            for (var i = 0; i < values.Count; i++)
            {
                var value = values[i];
                var defaultvalue = i < defaults.Count ? defaults[i] : null;
                result.Add(value == null || (value.Equals(defaultvalue) && !value.GetType().IsEnum) ? null : value);
            }

            return result;
        }

        //private void LoadMoreItems(uint count, int from)
        //{
        //    var rows = Data.Rows.Skip(from).AsQueryable().Take(50);
        //    _data.LoadItems(rows.Select(x => x.ToObject<T>()));
        //    //var list = _orders.Skip(baseIndex).Take(50).ToList();
        //    //IncrementalItemsSource.LoadItems(list);
        //}

        public override void AddVisualFilter(string column, string value)
        {
            if (!string.IsNullOrWhiteSpace(value))
            {
                DataGrid.Columns[column].FilterPredicates.Add(new FilterPredicate { FilterType = FilterType.Contains, FilterValue = value });
            }
        }

        #endregion

        #region Item Manipulation

        #region Load/Save/Delete

        protected virtual T[] LoadItems(CoreRow[] rows)
        {
            var result = new List<T>();
            foreach (var row in rows)
            {
                var index = Data.Rows.IndexOf(row);
                result.Add(LoadItem(row));
            }

            return result.ToArray();
        }

        protected abstract T LoadItem(CoreRow row);

        protected abstract void SaveItem(T item);

        protected virtual void SaveItems(T[] items)
        {
            foreach (var item in items)
                SaveItem(item);
        }

        protected virtual bool CanDeleteItems(params CoreRow[] rows)
        {
            return true;
        }

        protected abstract void DeleteItems(params CoreRow[] rows);

        protected virtual void DoDelete()
        {
            var rows = SelectedRows.ToArray();

            if (rows.Any())
                if (CanDeleteItems(rows))
                    if (MessageBox.Show("Are you sure you wish to delete the selected records?", "Confirm Delete", MessageBoxButton.YesNo) ==
                        MessageBoxResult.Yes)
                    {
                        DeleteItems(rows);
                        SelectedRows = Array.Empty<CoreRow>();
                        OnChanged?.Invoke(this);
                        Refresh(false, true);
                        SelectItems(null);
                    }
        }

        private void Delete_Click(object sender, RoutedEventArgs e)
        {
            DoDelete();
        }

        #endregion

        #region Edit

        protected virtual void DoEdit()
        {
            if (!SelectedRows.Any())
                return;

            var sel = SelectedRows.ToArray();
            if (AddEditClick(SelectedRows))
            {
                InvalidateGrid();
                SelectedRows = sel;
                SelectItems(SelectedRows);
            }
        }

        private void Edit_Click(object sender, RoutedEventArgs e)
        {
            DoEdit();
        }

        private void MultiEdit_Click(object sender, RoutedEventArgs e)
        {
            using (new WaitCursor())
            {
                var criteria = new Filters<T>();
                var columns = new Columns<T>();
                columns.Add("ID");
                var iprops = DatabaseSchema.Properties(typeof(T)).Where(x => x.Editor is not NullEditor);
                foreach (var iprop in iprops)
                    columns.Add(iprop.Name);
                var sort = LookupFactory.DefineSort<T>();
                Reload(
                    criteria,
                    columns,
                    ref sort,
                    (table, exception) =>
                    {
                        if(table is not null)
                        {
                            Dispatcher.Invoke(() => { DirectEdit(table); });
                        }
                        else if(exception is not null)
                        {
                            Logger.Send(LogType.Error, "", $"Error in MultiEdit: {CoreUtils.FormatException(exception)}");
                            MessageBox.Show(exception.Message);
                        }
                    }
                );
            }
        }

        public override bool DirectEdit(CoreTable data)
        {
            var window = new DynamicEditWindow<T>();

            window.OnCreateItem += () => CreateItem();

            window.OnCustomiseColumns += (o, c) =>
            {
                ConfigureColumns(MasterColumns);
                if (OnCustomiseColumns != null)
                    return OnCustomiseColumns(this, MasterColumns);
                return MasterColumns;
            };

            window.OnGetEditor += c =>
            {
                var result = GetEditor(this, c)?.CloneEditor();
                if (result == null)
                    return null;
                OnCustomiseEditor?.Invoke(window, null, c, result);
                return result;
            };

            window.OnGetSequence += c =>
            {
                decimal result = 0.0M;
                var customprop = DatabaseSchema.Property(typeof(T), c.ColumnName);
                if (customprop != null && customprop is CustomProperty)
                {
                    result = customprop.Sequence;
                }
                else
                {
                    var bits = c.ColumnName.Split('.');
                    for (var i = 0; i < bits.Length; i++)
                    {
                        var sProp = string.Join(".", bits.Take(bits.Length - i));
                        PropertyInfo? prop;
                        try
                        {
                            prop = CoreUtils.GetProperty(typeof(T), sProp);
                        }
                        catch (Exception e)
                        {
                            Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
                            prop = null;
                        }

                        if (prop != null)
                        {
                            result = prop.GetSequence() + result / 1000.0M;
                        }
                        else
                        {
                            var cprop = DatabaseSchema.Property(typeof(T), sProp);
                            if (cprop != null)
                                result = cprop.Sequence;
                            else
                                result /= 1000.0M;
                        }
                    }
                }

                return result;
            };

            window.Load(data);

            if (window.ShowDialog() == true)
            {
                SaveItems(window.Updates);
                return true;
            }

            return false;
        }

        protected virtual void DoAdd()
        {
            //CoreRow row = (SelectedRow > -1) && (SelectedRow < Data.Rows.Count) ?  Data.Rows[this.SelectedRow] : null;
            if (AddEditClick(null))
            {
                Refresh(false, true);
                OnChanged?.Invoke(this);
            }
        }

        private void Add_Click(object sender, RoutedEventArgs e)
        {
            DoAdd();
        }
        public virtual DynamicEditorPages LoadEditorPages(T item)
        {
            DynamicEditorPages pages = new DynamicEditorPages();
            DynamicGridUtils.LoadOneToManyPages(typeof(T), pages);
            DynamicGridUtils.LoadEnclosedListPages(typeof(T), pages);
            DynamicGridUtils.LoadManyToManyPages(typeof(T), pages);
            DynamicGridUtils.LoadCustomEditorPages(typeof(T), pages);
            foreach (var page in pages)
                page.Ready = false;
            return pages;
        }

        public virtual void LoadEditorButtons(T item, DynamicEditorButtons buttons)
        {
            buttons.Add(
                "",
                Properties.Resources.help.AsBitmapImage(),
                item,
                (f, i) =>
                {
                    Process.Start(new ProcessStartInfo("https://prs-software.com.au/wiki/index.php/" + typeof(T).Name.SplitCamelCase().Replace(" ", "_"))
                    { UseShellExecute = true });
                }
            );
        }

        protected virtual void CustomiseEditorForm(DynamicEditorForm form)
        {
        }

        public override bool EditItems(T[] items, Func<Type, CoreTable>? PageDataHandler = null, bool PreloadPages = false)
        {
            var cursor = new WaitCursor();

            var pages = items.Length == 1 ? LoadEditorPages(items.First()) : new DynamicEditorPages();

            var buttons = new DynamicEditorButtons();
            if (items.Length == 1)
                LoadEditorButtons(items.First(), buttons);

            var editor = new DynamicEditorForm(items.Any() ? items.First().GetType() : typeof(T), pages, buttons, PageDataHandler, PreloadPages);
            editor.SetValue(Panel.ZIndexProperty, 999);

            editor.OnCustomiseColumns += (o, c) =>
            {
                ConfigureColumns(MasterColumns /*, true */);
                return MasterColumns;
            };

            editor.OnDefineEditor += (o, c) =>
            {
                var result = GetEditor(o, c);

                if (result != null)
                    result = result.CloneEditor();

                return result;
            };

            editor.OnFormCustomiseEditor += (o, i, c, e) => OnCustomiseEditor?.Invoke(o, (T[])i, c, e);

            editor.OnDefineFilter += (sender, type) => { return DefineFilter(type, items); };

            //editor.OnDefineFilter += (o, e) => { return DefineFilter(items, e); };
            editor.OnDefineLookups += sender => { DefineLookups(sender, items); };

            editor.OnLookupsDefined += sender => { LookupsDefined(sender, items); };

            editor.OnEditorValueChanged += (s, n, v) => { return EditorValueChanged(editor, items, n, v); };

            editor.ReconfigureEditors += g => { ReconfigureEditors(g, items); };

            editor.OnValidateData += (o, i) => { return ValidateData(items); };

            editor.OnSelectPage += SelectPage;

            editor.OnGetDocument += LoadDocument;
            editor.OnFindDocument += FindDocument;
            editor.OnSaveDocument += SaveDocument;

            editor.OnSaveItem += (o, e) =>
            {
                try
                {
                    using var Wait = new WaitCursor();

                    OnBeforeSave?.Invoke(editor, items);

                    if (items.Length == 1)
                        editor.UnloadEditorPages(pages, items.First(), false);
                    foreach (var item in items)
                        SaveItem(item);
                    if (items.Length == 1)
                        editor.UnloadEditorPages(pages, items.First(), true);

                    OnAfterSave?.Invoke(editor, items);
                }
                catch (Exception err)
                {
                    MessageBox.Show(err.Message);
                    e.Cancel = true;
                }
            };
            CustomiseEditorForm(editor);

            editor.Items = items;

            AfterLoad(editor, items);
            cursor.Dispose();

            return editor.ShowDialog() == true;
        }

        private void UpdateEditor(DynamicEditorGrid grid, Expression<Func<IDimensioned, object?>> property, bool enabled)
        {
            if (!grid.TryFindEditor(new Column<IDimensioned>(property).Property, out var editor))
                return;
            editor.IsEnabled = enabled;
            if (!enabled)
                editor.SetValue(0D);
            else
            {
                var value = editor.GetValue();
                editor.SetValue(value);
            }
        }

        protected virtual void ReconfigureEditors(DynamicEditorGrid grid, T[] items)
        {
            if (items.First() is IDimensioned dimensioned)
            {
                UpdateEditor(grid, x => x.Dimensions.Quantity, dimensioned.Dimensions.GetUnit().HasQuantity);
                UpdateEditor(grid, x => x.Dimensions.Length, dimensioned.Dimensions.GetUnit().HasLength);
                UpdateEditor(grid, x => x.Dimensions.Width, dimensioned.Dimensions.GetUnit().HasWidth);
                UpdateEditor(grid, x => x.Dimensions.Height, dimensioned.Dimensions.GetUnit().HasHeight);
                UpdateEditor(grid, x => x.Dimensions.Weight, dimensioned.Dimensions.GetUnit().HasWeight);
            }
        }

        private string[]? ValidateData(T[] items)
        {
            var errors = new List<string>();
            DoValidate(items, errors);
            OnValidate?.Invoke(this, items, errors);
            return errors.Any() ? errors.ToArray() : null;
        }

        protected virtual void DoValidate(T[] items, List<string> errors)
        {
        }



        protected virtual void AfterLoad(DynamicEditorForm editor, T[] items)
        {
        }

        protected virtual void SelectPage(object sender, BaseObject[]? items)
        {
        }

        protected virtual Dictionary<string, object?> EditorValueChanged(DynamicEditorForm editor, T[] items, string name, object value)
        {
            var result = DynamicGridUtils.UpdateEditorValue(items, name, value);
            if (OnEditorValueChanged != null)
            {
                var newchanges = OnEditorValueChanged(editor, name, value);
                foreach (var key in newchanges.Keys)
                    result[key] = newchanges[key];
            }

            return result;
        }



        private readonly Dictionary<Tuple<Type, Type>, Dictionary<object, object>> _lookupcache = new();

        protected virtual void LookupsDefined(ILookupEditorControl sender, T[] items)
        {
        }

        protected virtual void DefineLookups(ILookupEditorControl sender, T[] items)
        {
            if (sender.EditorDefinition is not ILookupEditor editor)
                return;

            var colname = sender.ColumnName;

            //Logger.Send(LogType.Information, typeof(T).Name, "Into Define Lookups: " + colname);
            Task.Run(() =>
            {
                try
                {
                    var values = editor.Values(colname, items);
                    Dispatcher.Invoke(
                        () =>
                        {
                            try
                            {
                                //Logger.Send(LogType.Information, typeof(T).Name, "Dispatching Results" + colname);
                                sender.LoadLookups(values);
                            }
                            catch (Exception e2)
                            {
                                Logger.Send(LogType.Information, typeof(T).Name,
                                    "Exception (2) in LoadLookups: " + e2.Message + "\n" + e2.StackTrace);
                            }
                        }
                    );
                }
                catch (Exception e)
                {
                    Logger.Send(LogType.Information, typeof(T).Name, "Exception (1) in LoadLookups: " + e.Message + "\n" + e.StackTrace);
                }
            });
        }

        /// <summary>
        /// Retrieves an editor to display for the given column of <paramref name="item"/>.
        /// </summary>
        /// <param name="item">The object being edited.</param>
        /// <param name="column">The column of the editor.</param>
        /// <returns>A new editor, or <see langword="null"/> if no editor defined and no sensible default exists.</returns>
        protected virtual BaseEditor? GetEditor(object item, DynamicGridColumn column)
        {
            return column.Editor ?? CoreUtils.GetProperty(item.GetType(), column.ColumnName).GetEditor();
        }

        protected object DefineFilter(Type type, T[] items)
        {
            return LookupFactory.DefineFilter(items, type);
        }

        protected virtual void SetEditorValue(object item, string name, object value)
        {
            try
            {
                CoreUtils.SetPropertyValue(item, name, value);
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
            }
        }

        protected virtual object? GetEditorValue(object item, string name)
        {
            return CoreUtils.GetPropertyValue(item, name);
        }

        protected virtual Document? LoadDocument(Guid id)
        {
            return null;
        }

        protected virtual Document? FindDocument(string filename)
        {
            return null;
        }

        protected virtual void SaveDocument(Document document)
        {
        }

        private bool AddEditClick(CoreRow[]? rows)
        {
            if (!IsEnabled || bRefreshing)
                return false;

            if (rows == null || !rows.Any())
            {
                var item = CreateItem();

                // Yea, and this won't work, because we're actually usually showing the description of a linked item,
                // not the id of the link, and we need to set the ID to have it work properly :-(

                //foreach (String key in VisualFilters.Keys)
                //    CoreUtils.SetPropertyValue(item, key, VisualFilters[key]);

                if (EditItems(new[] { item }))
                {
                    //_CurrentRow = Data.Rows.Count;
                    var row = Data.NewRow();
                    ObjectToRow(item, row);
                    Data.Rows.Add(row);
                    InvalidateGrid();
                    SelectedRows = new[] { row };
                    OnChanged?.Invoke(this);
                    return true;
                }

                return false;
            }

            var items = Array.Empty<T>();
            using (new WaitCursor())
            {
                Stopwatch sw = new Stopwatch();
                sw.Start();
                items = LoadItems(rows);
                //Logger.Send(LogType.Information, "DG:LoadItems", String.Format("Loaded Items: {0}ms", sw.ElapsedMilliseconds));
                sw.Stop();
            }

            if (items.Any())
            {
                var sel = SelectedRows;
                if (EditItems(items))
                {
                    for (var i = 0; i < items.Length; i++)
                        ObjectToRow(items[i], rows[i]);
                    InvalidateGrid();
                    SelectedRows = sel;
                    OnChanged?.Invoke(this);
                    return true;
                }

                return false;
            }

            return false;
        }

        #endregion

        #region Duplicate

        protected virtual IEnumerable<T> LoadDuplicatorItems(CoreRow[] rows)
        {
            return LoadItems(rows);
        }

        private bool DoDuplicate(Button button, CoreRow[] rows)
        {
            if (!rows.Any())
            {
                MessageBox.Show("Please select at least one record to duplicate!");
                return false;
            }

            /*var ids = ExtractValues(x => x.ID, Selection.Selected).ToArray();
            if (!ids.Any())
            {
                MessageBox.Show("Please select at least one record to duplicate!");
                return false;
            }*/

            var duplicator = (new T() as IDuplicatable)?.GetDuplicator();
            if (duplicator is null)
            {
                MessageBox.Show($"Cannot duplicate {typeof(T)}");
                return false;
            }

            duplicator.Duplicate(LoadDuplicatorItems(rows));// new Filter<T>(x => x.ID).InList(ids));
            return true;
        }

        #endregion

        protected virtual void ShowHelp(string slug)
        {
            Process.Start(new ProcessStartInfo("https://prs-software.com.au/wiki/index.php/" + slug) { UseShellExecute = true });
        }

        protected void ReloadForms<TTargetType, TTargetForm, TSourceForm>(DynamicEditorForm editor, TTargetType item,
            Expression<Func<TSourceForm, object?>> sourcekey, Guid sourceid)
            where TTargetType : Entity, new()
            where TTargetForm : Entity, IRemotable, IPersistent, IDigitalFormInstance, new()
            where TSourceForm : Entity, IRemotable, IPersistent, IDigitalForm<TTargetType>, new()
        {
            var type = typeof(IDynamicOneToManyGrid<,>).MakeGenericType(typeof(TTargetType), typeof(TTargetForm));
            var page =
                editor.Pages?.FirstOrDefault(x => x.GetType().GetInterfaces().Contains(type)) as IDynamicOneToManyGrid<TTargetType, TTargetForm>;
            if (page != null && item != null)
            {
                if (!page.Ready)
                    page.Load(item, null);

                CoreTable table;
                if (sourceid == Guid.Empty)
                {
                    table = new CoreTable();
                    table.LoadColumns(typeof(TSourceForm));
                }
                else
                {
                    table = new Client<TSourceForm>().Query(
                        new Filter<TSourceForm>(sourcekey).IsEqualTo(sourceid).And(x => x.Form.AppliesTo)
                            .IsEqualTo(typeof(TTargetType).EntityName().Split('.').Last())
                    );
                }

                var newforms = new List<TTargetForm>();
                foreach (var row in table.Rows)
                {
                    var sourceform = row.ToObject<TSourceForm>();
                    var targetform = new TTargetForm();

                    targetform.Form.ID = sourceform.Form.ID;
                    targetform.Form.Synchronise(sourceform.Form);
                    newforms.Add(targetform);
                }

                page.Items.Clear();
                page.LoadItems(newforms.ToArray());
            }
        }


        #region ClipBuffer

        private Tuple<ClipAction, CoreRow[]>? ClipBuffer;

        protected void ResetClipBuffer()
        {
            ClipBuffer = null;
        }

        protected void SetClipBuffer(ClipAction action, CoreRow[] rows)
        {
            ClipBuffer = new Tuple<ClipAction, CoreRow[]>(action, rows);
        }

        private void CutToClipBuffer()
        {
            SetClipBuffer(ClipAction.Cut, SelectedRows);
            InvalidateGrid();
        }


        private void CopyToClipBuffer()
        {
            SetClipBuffer(ClipAction.Copy, SelectedRows);
            InvalidateGrid();
        }

        private void PasteFromClipBuffer()
        {
            if (ClipBuffer == null)
                return;

            if (!IsSequenced)
                return;

            using (new WaitCursor())
            {
                var updates = ClipBuffer.Item2.Select(x => x.ToObject<T>()).ToList();
                if (BeforePaste(updates, ClipBuffer.Item1))
                {
                    var currow = SelectedRows.FirstOrDefault()
                        ?? Data.Rows.LastOrDefault();

                    var sequence = currow != null ? currow.Get<T, long>(c => ((ISequenceable)c).Sequence) : 0;

                    var postrows = Data.Rows.Where(r => !ClipBuffer.Item2.Contains(r) && r.Get<ISequenceable, long>(x => x.Sequence) >= sequence);
                    updates.AddRange(LoadItems(postrows.ToArray()));

                    foreach (var update in updates)
                    {
                        sequence++;
                        ((ISequenceable)update).Sequence = sequence;
                    }
                }

                if (updates.Any())
                {
                    SaveItems(updates.ToArray());
                    Refresh(false, true);
                }
            }
        }

        protected virtual bool BeforePaste(IEnumerable<T> items, ClipAction action)
        {
            return true;
        }
        private void Cut_Click(object sender, RoutedEventArgs e)
        {
            CutToClipBuffer();
        }

        private void Copy_Click(object sender, RoutedEventArgs e)
        {
            CopyToClipBuffer();
        }

        private void Paste_Click(object sender, RoutedEventArgs e)
        {
            PasteFromClipBuffer();
        }

        #endregion

        protected virtual void ObjectToRow(T obj, CoreRow row)
        {
            Data.LoadRow(row, obj);
        }

        #region Import / Export

        protected virtual Guid GetImportID()
        {
            return Guid.Empty;
        }

        protected virtual bool CustomiseImportItem(T item)
        {
            if (IsSequenced)
                ((ISequenceable)item).Sequence = CoreUtils.GenerateSequence();
            return true;
        }

        protected virtual string CustomiseImportFileName(string filename)
        {
            return filename;
        }

        private void Import_Click(object sender, RoutedEventArgs e)
        {
            var list = new DynamicImportList(
                typeof(T),
                GetImportID()
            );
            list.OnImportItem += o => { return CustomiseImportItem((T)o); };
            list.OnCustomiseImport += (o, args) => { args.FileName = CustomiseImportFileName(args.FileName); };
            list.ShowDialog();
            Refresh(false, true);
        }

        protected virtual void CustomiseExportColumns(List<string> columnnames)
        {
        }

        protected virtual string CustomiseExportFileName(string filename)
        {
            return filename;
        }

        protected virtual void CustomiseExportFilters(Filters<T> filters, CoreRow[] visiblerows)
        {
        }

        protected virtual void ApplyExportFilter(CoreTable table, object data)
        {
        }

        private void Export_Click(object sender, RoutedEventArgs e)
        {
            var columnnames = VisibleColumns.Select(x => x.ColumnName).ToList();
            CustomiseExportColumns(columnnames);
            var form = new DynamicExportForm(typeof(T), columnnames);
            if (form.ShowDialog() != true)
                return;

            var filters = new Filters<T>();
            filters.Add(DefineFilter());

            var visiblerows = GetVisibleRows();
            CustomiseExportFilters(filters, visiblerows);

            var columns = new Columns<T>(form.Fields);
            var otherColumns = form.GetChildFields()
                .Select(x => new Tuple<Type, IColumns>(
                    x.Key,
                    (Activator.CreateInstance(typeof(Columns<>).MakeGenericType(x.Key), new object[] { x.Value }) as IColumns)!))
                .Where(x => x.Item2.ColumnNames().Any()).ToList();

            var sort = LookupFactory.DefineSort<T>();
            Reload(filters, columns, ref sort, (data, err) => Dispatcher.Invoke(() => {
                if(data is not null)
                {
                    var list = new List<Tuple<Type?, CoreTable>>() { new(typeof(T), data) };
                    list.AddRange(LoadExportTables(filters, otherColumns));
                    DoExport(list);
                }
                else if (err is not null)
                {
                    Logger.Send(LogType.Error, "", $"Error in export: {CoreUtils.FormatException(err)}");
                    MessageBox.Show(err.Message);
                }
            }));
        }

        /// <summary>
        /// Loads the child tables for an export, based on the filter of the parent table.
        /// </summary>
        /// <remarks>
        /// If not overriden, defaults to creating empty tables with no records.
        /// </remarks>
        /// <param name="filter">Filter for the parent table.</param>
        /// <param name="tableColumns">A list of the child table types, with columns to load for each</param>
        /// <returns>A list of tables, in the same order as they came in <paramref name="tableColumns"/></returns>
        protected virtual IEnumerable<Tuple<Type?, CoreTable>> LoadExportTables(Filters<T> filter, IEnumerable<Tuple<Type, IColumns>> tableColumns)
        {
            return tableColumns.Select(x => {
                var table = new CoreTable();
                table.LoadColumns(x.Item2);
                return new Tuple<Type?, CoreTable>(x.Item1, table);
            });
        }

        private void DoExport(List<Tuple<Type?, CoreTable>> data)
        {
            var filename = CustomiseExportFileName(typeof(T).EntityName().Split('.').Last());
            ExcelExporter.DoExport(data, filename);
        }

        #endregion

        public void ScrollIntoView(CoreRow row)
        {
            DataGrid.ScrollInView(new RowColumnIndex(row.Index + 1, 0));
        }

        #endregion

        #region Custom Buttons

        private Button CreateButton(BitmapImage? image = null, string? text = null, string? tooltip = null)
        {
            var button = new Button();
            button.SetValue(BorderBrushProperty, new SolidColorBrush(Colors.Gray));
            button.SetValue(BorderThicknessProperty, new Thickness(0.75));
            button.Height = 30;
            UpdateButton(button, image, text, tooltip);
            return button;
        }

        protected void UpdateButton(Button button, BitmapImage? image, string? text, string? tooltip = null)
        {
            var stackPnl = new StackPanel();
            stackPnl.Orientation = Orientation.Horizontal;
            //stackPnl.Margin = new Thickness(2);

            if (image != null)
            {
                var img = new Image();
                img.Source = image;
                img.Margin = new Thickness(2);
                img.ToolTip = tooltip;
                stackPnl.Children.Add(img);
            }

            if (!string.IsNullOrEmpty(text))
            {
                var lbl = new Label();
                lbl.Content = text;
                lbl.VerticalAlignment = VerticalAlignment.Stretch;
                lbl.VerticalContentAlignment = VerticalAlignment.Center;
                lbl.Margin = new Thickness(2, 0, 5, 0);
                lbl.ToolTip = ToolTip;
                stackPnl.Children.Add(lbl);
            }

            button.Content = stackPnl;
            button.ToolTip = tooltip;
        }

        private bool bFirstButtonAdded = true;

        private bool AnyButtonsVisible()
        {
            if (Add.Visibility != Visibility.Collapsed)
                return true;
            if (Edit.Visibility != Visibility.Collapsed)
                return true;
            if (MultiEdit.Visibility != Visibility.Collapsed)
                return true;
            if (Export.Visibility != Visibility.Collapsed)
                return true;
            return false;
        }


        public Button AddButton(string caption, BitmapImage? image, string? tooltip, Func<Button, CoreRow[], bool> action)
        {
            var button = CreateButton(image, caption, tooltip);
            button.Margin = new Thickness(bFirstButtonAdded && AnyButtonsVisible() ? /* 10 */ 0 : 0, 2, 2, 0);
            button.Padding = new Thickness(5, 0, 5, 0);
            button.Tag = action;
            button.Click += Button_Click;
            Stack.Children.Add(button);
            bFirstButtonAdded = false;
            return button;
        }

        public Button AddButton(string caption, BitmapImage? image, Func<Button, CoreRow[], bool> action)
        {
            var result = AddButton(caption, image, null, action);
            return result;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var button = (Button)sender;
            var action = (Func<Button, CoreRow[], bool>)button.Tag;

            //CoreRow row = (CurrentRow > -1) && (CurrentRow < Data.Rows.Count) ? Data.Rows[this.CurrentRow] : null;
            if (action.Invoke(button, SelectedRows))
                Refresh(false, true);
        }

        #endregion

        #region Header Actions

        private void SelectColumnsClick(object sender, RoutedEventArgs e)
        {
            var editor = new DynamicGridColumnsEditor(typeof(T));
            editor.DirectEdit = Options.Contains(DynamicGridOption.DirectEdit);

            editor.Columns.AddRange(VisibleColumns);

            if (editor.ShowDialog().Equals(true))
            {
                VisibleColumns.Clear();
                VisibleColumns.AddRange(editor.Columns);
                SaveColumns(VisibleColumns);
                //OnSaveColumns?.Invoke(this, editor.Columns);
                Refresh(true, true);
            }
        }

        #endregion

        /* Removed as appears unused; removed as of 19/12/2022
        #region CellRendering

        private void PopulateDynamicActionCell(DynamicActionColumn column, int rowIndex, int columnIndex, GridStyleInfo style)
        {
            style.CellType = "ImageCell";
            var bi = column.Image?.Invoke(rowIndex < 0 ? null : Data.Rows[rowIndex]);
            if (bi != null)
            {
                style.CellValue = bi;
                style.BorderMargins = new CellMarginsInfo(4.0F);
            }
        }

        //bool rowstylehelperinitialised = false;

        //protected virtual void ProcessCellStyle(CoreRow row, int column, GridStyleInfo style)
        //{

        //    if (!rowstylehelperinitialised)
        //    {
        //        Script stylescript = new Client<Script>().Load(new Filter<Script>(x => x.Section).IsEqualTo(typeof(T).EntityName()).And(x => x.ScriptType).IsEqualTo(ScriptType.RowStyle)).FirstOrDefault(); ;
        //        if (stylescript != null)
        //        {

        //            rowstylehelper = new ScriptDocument(stylescript.Code);
        //            if (!rowstylehelper.Compile())
        //            {
        //                MessageBox.Show("Unable to Load Row Style Helper!\r\n\r\n" + rowstylehelper.Result);
        //                rowstylehelper = null;
        //            }

        //        }
        //        rowstylehelperinitialised = true;
        //    }

        //    if (rowstylehelper != null)
        //    {
        //        try
        //        {
        //            rowstylehelper.SetValue("Row", row);
        //            rowstylehelper.SetValue("Column", Data.Columns[column].ColumnName);
        //            rowstylehelper.SetValue("Background", style.Background);
        //            rowstylehelper.SetValue("Foreground", style.Foreground);
        //            rowstylehelper.SetValue("Style", style.Font.FontStyle);
        //            rowstylehelper.SetValue("Weight", style.Font.FontWeight);
        //            if (rowstylehelper.Execute())
        //            { 
        //                style.Background = (System.Windows.Media.Brush)rowstylehelper.GetValue("Background");
        //                style.Foreground = (System.Windows.Media.Brush)rowstylehelper.GetValue("Foreground");
        //                style.Font.FontStyle = (FontStyle)rowstylehelper.GetValue("Style");
        //                style.Font.FontWeight = (FontWeight)rowstylehelper.GetValue("Weight");
        //            }
        //        }
        //        catch (Exception e)
        //        {
        //            //MessageBox.Show("Unable to Invoke Row Style Helper!\r\n\r\n" + e.Message);
        //        }
        //    }
        //}

        private readonly Dictionary<string, BaseEditor> editorcache = new();

        private void PopulateDataCell(int rowIndex, int columnIndex, GridStyleInfo style)
        {
            if (columnIndex > -1 && columnIndex < ColumnList.Count)
            {
                var o = ColumnList[columnIndex];
                if (o is DynamicActionColumn)
                {
                    PopulateDynamicActionCell((DynamicActionColumn)o, rowIndex, columnIndex, style);
                }
                else
                {
                    var dgc = (DynamicGridColumn)o;

                    var dc = Data.Columns.FirstOrDefault(x => x.ColumnName.Equals(dgc.ColumnName));

                    var fmt = string.IsNullOrWhiteSpace(dgc.Format) ? "{0}" : "{0:" + dgc.Format.Replace("\\:", ":").Replace(":", "\\:") + "}";

                    object? val = null;
                    if (rowIndex < Data.Rows.Count)
                        val = Data.Rows[rowIndex][dgc.ColumnName];

                    if (val != null && dgc.Lookups.ContainsKey(val))
                        val = dgc.Lookups[val];

                    if (dc != null)
                    {
                        if(!editorcache.TryGetValue(dc.ColumnName, out var editor))
                        {
                            var prop = DatabaseSchema.Property(typeof(T), dc.ColumnName);
                            if (prop != null)
                                editor = prop.Editor;
                            else
                                editor = EditorUtils.GetEditor(dc.DataType) ?? new NullEditor();
                            editorcache[dc.ColumnName] = editor;
                        }

                        if (editor is CheckBoxEditor)
                        {
                            style.CellType = "CheckBox";
                            style.CellValue = val;

                            style.HorizontalAlignment = dc == null ? HorizontalAlignment.Left : dgc.HorizontalAlignment(dc.DataType);
                            style.VerticalAlignment = dgc.VerticalAlignment();
                            style.TextMargins = new CellMarginsInfo(2.0F);
                        }
                        else if (editor is ColorEditor)
                        {
                            style.CellType = "ImageCell";
                            var str = val?.ToString();
                            if (!string.IsNullOrWhiteSpace(str))
                            {
                                var color = ColorTranslator.FromHtml(str); // System.Drawing.Color.FromName(val.ToString());
                                var bitmap = ImageUtils.BitmapFromColor(color, (int)style.GridModel.ColumnWidths[columnIndex],
                                    (int)style.GridModel.RowHeights[rowIndex], Color.Black);
                                //bitmap.Save(val.ToString().Replace("#","") + ".png");
                                style.CellValue = bitmap.AsBitmapImage(false);
                                style.BorderMargins = new CellMarginsInfo(4.0F);
                            }
                        }
                        else
                        {
                            string value;
                            try
                            {
                                if(val is null)
                                {
                                    value = "";
                                }
                                else if (val.GetType().IsEnum)
                                {
                                    value = val.ToString()!;
                                }
                                else if (val.GetType().IsDefault(val))
                                {
                                    value = "";
                                }
                                else
                                {
                                    value = string.Format(new TimeSpanFormatter(), fmt, val);
                                }
                            }
                            catch (Exception e)
                            {
                                Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
                                value = val?.ToString() ?? "";
                            }

                            if (editor is PasswordEditor)
                                style.CellValue = "".PadLeft(value.Length, '●');
                            else
                                style.CellValue = value;
                            style.HorizontalAlignment = dc == null ? HorizontalAlignment.Left : dgc.HorizontalAlignment(dc.DataType);
                            style.VerticalAlignment = dgc.VerticalAlignment();
                            style.CellType = "Static";
                            style.TextMargins = new CellMarginsInfo(2.0F);
                        }
                    }
                }
            }
        }

        private void PopulateHeaderCell(int columnIndex, GridStyleInfo style)
        {
            if (columnIndex > -1 && columnIndex < ColumnList.Count)
            {
                var o = ColumnList[columnIndex];
                if (o is DynamicActionColumn)
                {
                    PopulateDynamicActionCell((DynamicActionColumn)o, -1, columnIndex, style);
                }
                else
                {
                    var dgc = (DynamicGridColumn)o;
                    if (Data != null)
                    {
                        var dc = Data.Columns.FirstOrDefault(x => x.ColumnName.Equals(dgc.ColumnName));
                        style.HorizontalAlignment = dc != null ? dgc.HorizontalAlignment(dc.DataType) : HorizontalAlignment.Left;
                    }

                    style.CellValue = string.IsNullOrWhiteSpace(dgc.Caption) ? dgc.ColumnName : dgc.Caption;
                    style.VerticalAlignment = dgc.VerticalAlignment();
                    style.CellType = "Static";
                    style.TextMargins = new CellMarginsInfo(2.0F);
                }
            }
        }

        #endregion
        */
        /* Removed as appears unused; removed as of 19/12/2022
        #region Drag and Drop

        private Point startpoint;

        private void CheckPreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            if (!Options.Contains(DynamicGridOption.DragSource))
                return;
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                Logger.Send(LogType.Information, GetType().EntityName(), "Initiating Start Point");
                startpoint = e.GetPosition(DataGrid);
            }
        }

        //private void CheckPreviewMouseMove(object sender, MouseEventArgs e)
        //{
        //    Logger.Send(LogType.Information, this.GetType().EntityName(), String.Format("Checking Mouse Move: StartPoint = {0},{1}", startpoint.X, startpoint.Y));

        //    if (!_Options.Contains(DynamicGridOptions.DragSource))
        //        return;
        //    Vector diff = startpoint - e.GetPosition(null);
        //    Logger.Send(LogType.Information, this.GetType().EntityName(), String.Format("Checking Mouse Move: StartPoint = {0},{1} Diff = {2},{3}", startpoint.X, startpoint.Y, diff.X, diff.Y));

        //    if ( (startpoint.X != 0) && (startpoint.Y != 0))
        //    {
        //        if ((Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance) || (Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
        //        {
        //            Logger.Send(LogType.Information, this.GetType().EntityName(), "Starting Drag Drop Operation");
        //            DataObject dragData = new DataObject(typeof(T).EntityName(), SelectedRows);
        //            DragDrop.DoDragDrop(DataGrid, dragData, DragDropEffects.Copy);
        //        }
        //    }
        //}

        private void CheckPreviewMouseUp(object sender, MouseButtonEventArgs e)
        {
            if (!Options.Contains(DynamicGridOption.DragSource))
                return;

            Logger.Send(LogType.Information, GetType().EntityName(), "Clearing Start Point");
            startpoint = new Point();
        }

        #endregion
        */
    }
}