inabox/inabox.wpf/DynamicGrid/DynamicSplitPanel.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using InABox.Core;
using Syncfusion.Windows.Controls.Input;

namespace InABox.DynamicGrid
{
    [Flags]
    public enum DynamicSplitPanelView
    {
        Master = 1,
        Detail = 2,
        Combined = 4
    }

    public enum DynamicSplitPanelAnchor
    {
        Master,
        Detail
    }

    public class DynamicSplitPanelSettings : EventArgs
    {
        public DynamicSplitPanelView View { get; set; }
        public double AnchorWidth { get; set; }
        public double DetailHeight { get; set; }
    }

    public delegate void DynamicSplitPanelChanged(object sender, DynamicSplitPanelSettings e);

    public class DynamicSplitPanel : Control
    {
        
        public static readonly DependencyProperty AllowableViewsProperty = DependencyProperty.Register(
            nameof(AllowableViews), 
            typeof(DynamicSplitPanelView),
            typeof(DynamicSplitPanel), 
            new UIPropertyMetadata( DynamicSplitPanelView.Master | DynamicSplitPanelView.Combined | DynamicSplitPanelView.Detail ));
        
        public static readonly DependencyProperty ViewProperty = DependencyProperty.Register("View", typeof(DynamicSplitPanelView),
            typeof(DynamicSplitPanel), new UIPropertyMetadata(DynamicSplitPanelView.Detail));

        public static readonly DependencyProperty AnchorProperty = DependencyProperty.Register(nameof(Anchor), typeof(DynamicSplitPanelAnchor),
            typeof(DynamicSplitPanel), new UIPropertyMetadata(DynamicSplitPanelAnchor.Master));
        
        public static readonly DependencyProperty AnchorWidthProperty =
            DependencyProperty.Register(nameof(AnchorWidth), typeof(double), typeof(DynamicSplitPanel), new UIPropertyMetadata((double)300F));

        public static readonly DependencyProperty MasterCaptionProperty =
            DependencyProperty.Register("MasterCaption", typeof(string), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty DetailCaptionProperty =
            DependencyProperty.Register("DetailCaption", typeof(string), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty HeaderProperty =
            DependencyProperty.Register("Header", typeof(FrameworkElement), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty MasterProperty =
            DependencyProperty.Register(nameof(Master), typeof(FrameworkElement), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty DetailHeaderProperty =
            DependencyProperty.Register("DetailHeader", typeof(FrameworkElement), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty DetailProperty =
            DependencyProperty.Register("Detail", typeof(FrameworkElement), typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        public static readonly DependencyProperty DetailHeightProperty =
            DependencyProperty.Register("DetailHeight", typeof(double), typeof(DynamicSplitPanel), new UIPropertyMetadata((double)200F));

        public static readonly DependencyProperty SecondaryDetailProperty = DependencyProperty.Register("SecondaryDetail", typeof(FrameworkElement),
            typeof(DynamicSplitPanel), new UIPropertyMetadata(null));

        private Button CombinedLeft;
        private Button CombinedRight;

        private Grid DetailGrid;
        private Label DetailsHeader;
        private Button DetailsOnly;
        private SfGridSplitter DetailSplitter;

        private Grid Grid;
        private Label MasterHeader;
        private Button MasterOnly;
        private SfGridSplitter Splitter;


        static DynamicSplitPanel()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(DynamicSplitPanel), new FrameworkPropertyMetadata(typeof(DynamicSplitPanel)));
        }
        
        public DynamicSplitPanelView AllowableViews
        {
            get => (DynamicSplitPanelView)GetValue(AllowableViewsProperty);
            set
            {
                SetValue(AllowableViewsProperty, value);
                ConfigureScreen();
            }
            
        }    
        
        private bool IsViewAllowed(params DynamicSplitPanelView[] views)
        {
            foreach (var view in views)
            {
                if ((AllowableViews & view) == view)
                    return true;
            }
            return false;
        }

        public DynamicSplitPanelView View
        {
            get => (DynamicSplitPanelView)GetValue(ViewProperty);
            set
            {
                SetValue(ViewProperty, value);
                ConfigureScreen();
            }
        }

        public DynamicSplitPanelAnchor Anchor
        {
            get => (DynamicSplitPanelAnchor)GetValue(AnchorProperty);
            set 
            {
                SetValue(AnchorProperty, value);
                ConfigureScreen();
            }
        }
        
        public double AnchorWidth
        {
            get => (double)GetValue(AnchorWidthProperty);
            set
            {
                SetValue(AnchorWidthProperty, value);
                ConfigureScreen();
            }
        }

        public string MasterCaption
        {
            get => (string)GetValue(MasterCaptionProperty);
            set => SetValue(MasterCaptionProperty, value);
            //MasterHeader.Content = value;
        }

        public string DetailCaption
        {
            get => (string)GetValue(DetailCaptionProperty);
            set => SetValue(DetailCaptionProperty, value);
            //DetailHeader.Content = value;
        }

        public FrameworkElement Header
        {
            get => (FrameworkElement)GetValue(HeaderProperty);
            set => SetValue(HeaderProperty, value);
        }

        public FrameworkElement Master
        {
            get => (FrameworkElement)GetValue(MasterProperty);
            set => SetValue(MasterProperty, value);
        }

        public FrameworkElement DetailHeader
        {
            get => (FrameworkElement)GetValue(DetailHeaderProperty);
            set => SetValue(DetailHeaderProperty, value);
        }

        public FrameworkElement Detail
        {
            get => (FrameworkElement)GetValue(DetailProperty);
            set => SetValue(DetailProperty, value);
        }

        public double DetailHeight
        {
            get => (double)GetValue(DetailHeightProperty);
            set
            {
                SetValue(DetailHeightProperty, value);
                ConfigureScreen();
            }
        }

        public FrameworkElement SecondaryDetail
        {
            get => (FrameworkElement)GetValue(SecondaryDetailProperty);
            set => SetValue(SecondaryDetailProperty, value);
        }

        public event DynamicSplitPanelChanged OnChanged;

        private void RightClick(object sender, RoutedEventArgs e)
        {
            if (View == DynamicSplitPanelView.Detail)
                View = DynamicSplitPanelView.Combined;
            else if (View == DynamicSplitPanelView.Combined)
                View = DynamicSplitPanelView.Master;
            Changed();
        }

        private void LeftClick(object sender, RoutedEventArgs e)
        {
            if (View == DynamicSplitPanelView.Master)
                View = DynamicSplitPanelView.Combined;
            else if (View == DynamicSplitPanelView.Combined)
                View = DynamicSplitPanelView.Detail;
            Changed();
        }

        public bool IsMasterVisible() => View == DynamicSplitPanelView.Master || View == DynamicSplitPanelView.Combined;

        public bool IsDetailVisible() => View == DynamicSplitPanelView.Detail || View == DynamicSplitPanelView.Combined;

        private void ConfigureScreen()
        {
            CheckParts();
            try
            {
                if (MasterHeader != null)
                    MasterHeader.Content = MasterCaption;
                
                if (DetailsHeader != null)
                    DetailsHeader.Content = DetailCaption;

                if (CombinedLeft != null)
                    CombinedLeft.Visibility = View == DynamicSplitPanelView.Combined && AllowableViews.HasFlag(DynamicSplitPanelView.Master) ? Visibility.Visible : Visibility.Collapsed;

                if (CombinedRight != null)
                    CombinedRight.Visibility = View == DynamicSplitPanelView.Combined && AllowableViews.HasFlag(DynamicSplitPanelView.Detail) ? Visibility.Visible : Visibility.Collapsed;

                if (Grid != null)
                {
                    Grid.ColumnDefinitions[0].Width = (View == DynamicSplitPanelView.Detail) 
                                                      && (Master != null) 
                                                      && (IsViewAllowed(DynamicSplitPanelView.Combined,DynamicSplitPanelView.Master))
                        ? new GridLength(1.0F, GridUnitType.Auto)
                        : new GridLength(0.0F, GridUnitType.Pixel);
                    
                    Grid.ColumnDefinitions[1].Width = Master == null 
                        ? new GridLength(0.0F, GridUnitType.Pixel) 
                        : View switch { 
                            DynamicSplitPanelView.Master => new GridLength(1.0F, GridUnitType.Star),
                            DynamicSplitPanelView.Detail => new GridLength(0.0F, GridUnitType.Pixel),
                            _ => Anchor == DynamicSplitPanelAnchor.Master 
                                ? new GridLength(AnchorWidth, GridUnitType.Pixel) 
                                : new GridLength(1.0F, GridUnitType.Star)
                        };
                    
                    Grid.ColumnDefinitions[2].Width = (View == DynamicSplitPanelView.Combined) 
                                                      && (Master != null)
                        ? new GridLength(1.0F, GridUnitType.Auto)
                        : new GridLength(0.0F, GridUnitType.Pixel);

                    Grid.ColumnDefinitions[3].Width = View switch
                    {
                        DynamicSplitPanelView.Master => new GridLength(0.0F, GridUnitType.Pixel),
                        DynamicSplitPanelView.Detail => new GridLength(1.0F, GridUnitType.Star),
                        _ => Anchor == DynamicSplitPanelAnchor.Detail
                            ? new GridLength(AnchorWidth, GridUnitType.Pixel)
                            : new GridLength(1.0F, GridUnitType.Star)
                    };
                        
                    Grid.ColumnDefinitions[4].Width = (View == DynamicSplitPanelView.Master) 
                                                      && (IsViewAllowed(DynamicSplitPanelView.Combined,DynamicSplitPanelView.Detail))
                        ? new GridLength(1.0F, GridUnitType.Auto)
                        : new GridLength(0.0F, GridUnitType.Pixel);
                    
                    Grid.RowDefinitions[0].Height =
                        Header == null ? new GridLength(0.0F, GridUnitType.Pixel) : new GridLength(1.0F, GridUnitType.Auto);
                }

                if (DetailGrid != null)
                {
                    DetailGrid.SetValue(Grid.RowProperty, DetailHeader == null ? 0 : 1);
                    DetailGrid.SetValue(Grid.RowSpanProperty, DetailHeader == null ? 2 : 1);
                    DetailGrid.RowDefinitions[0].Height = SecondaryDetail == null
                        ? new GridLength(1.0F, GridUnitType.Star)
                        : new GridLength(DetailHeight, GridUnitType.Pixel);
                    DetailGrid.RowDefinitions[1].Height =
                        SecondaryDetail == null ? new GridLength(0.0F, GridUnitType.Pixel) : new GridLength(1.0F, GridUnitType.Auto);
                    DetailGrid.RowDefinitions[2].Height =
                        SecondaryDetail == null ? new GridLength(0.0F, GridUnitType.Pixel) : new GridLength(1.0F, GridUnitType.Star);
                    DetailSplitter.IsEnabled = SecondaryDetail != null;
                }


                if (CombinedRight != null)
                {
                    CombinedRight.Visibility = (View == DynamicSplitPanelView.Combined) && IsViewAllowed(DynamicSplitPanelView.Master)
                        ? Visibility.Visible
                        : Visibility.Collapsed;
                }
                
                if (CombinedLeft != null)
                {
                    CombinedLeft.Visibility = (View == DynamicSplitPanelView.Combined) && IsViewAllowed(DynamicSplitPanelView.Detail)
                        ? Visibility.Visible
                        : Visibility.Collapsed;
                }

            }
            catch (Exception e)
            {
                Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
            }
        }

        private void Splitter_PreviewMouseUp(object sender, MouseButtonEventArgs e)
        {
            if (Anchor == DynamicSplitPanelAnchor.Master)
                SetValue(AnchorWidthProperty, Grid.ColumnDefinitions[1].ActualWidth);
            else 
                SetValue(AnchorWidthProperty, Grid.ColumnDefinitions[3].ActualWidth);
            SetValue(DetailHeightProperty, SecondaryDetail == null ? 0.0F : DetailGrid.RowDefinitions[0].ActualHeight);
            Changed();
        }

        private void Changed()
        {
            OnChanged?.Invoke(this, new DynamicSplitPanelSettings { View = View, AnchorWidth = AnchorWidth, DetailHeight = DetailHeight });
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            CheckParts();

            ConfigureScreen();
        }

        private void CheckParts()
        {
            try
            {
                if (Grid == null)
                    Grid = GetTemplateChild("PART_Grid") as Grid;

                if (DetailGrid == null)
                    DetailGrid = GetTemplateChild("PART_DetailGrid") as Grid;

                if (MasterHeader == null)
                    MasterHeader = GetTemplateChild("PART_MasterHeader") as Label;

                if (DetailsHeader == null)
                    DetailsHeader = GetTemplateChild("PART_DetailHeader") as Label;

                if (Splitter == null)
                {
                    Splitter = GetTemplateChild("PART_Splitter") as SfGridSplitter;
                    if (Splitter != null)
                    {
                        Splitter.PreviewMouseUp += Splitter_PreviewMouseUp;
                        Splitter.TargetUpdated += Splitter_TargetUpdated;
                    }
                }

                if (DetailSplitter == null)
                {
                    DetailSplitter = GetTemplateChild("PART_DetailSplitter") as SfGridSplitter;
                    if (DetailSplitter != null)
                        DetailSplitter.PreviewMouseUp += Splitter_PreviewMouseUp;
                }

                if (DetailsOnly == null)
                {
                    DetailsOnly = GetTemplateChild("PART_DetailsOnly") as Button;
                    if (DetailsOnly != null)
                        DetailsOnly.Click += RightClick;
                }

                if (CombinedRight == null)
                {
                    CombinedRight = GetTemplateChild("PART_CombinedRight") as Button;
                    if (CombinedRight != null)
                        CombinedRight.Click += RightClick;
                }

                if (CombinedLeft == null)
                {
                    CombinedLeft = GetTemplateChild("PART_CombinedLeft") as Button;
                    if (CombinedLeft != null)
                        CombinedLeft.Click += LeftClick;
                }

                if (MasterOnly == null)
                {
                    MasterOnly = GetTemplateChild("PART_MasterOnly") as Button;
                    if (MasterOnly != null)
                        MasterOnly.Click += LeftClick;
                }
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
            }
        }

        private void Splitter_TargetUpdated(object sender, DataTransferEventArgs e)
        {
            //
        }
    }
}