BeWoPlaner/BeWo/View/Controls/AI/AiPromptbausteinLibraryControl.xaml.cs

using BeWo.ViewModel;
using DevExpress.Xpf.Editors;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace BeWo.View.Controls.AI
{
	/// <summary>
	/// Gemeinsame Promptbaustein-Bibliothek (TreeView + GridSplitter + TabControl),
	/// genutzt von AiPromptbausteinComplexTreeView und AiPromptbausteinComplexSelectionView.
	/// Der DataContext wird vom Host geerbt und muss IAiPromptbausteinComplexViewModel implementieren.
	/// </summary>
	public partial class AiPromptbausteinLibraryControl : UserControl
	{
		public AiPromptbausteinLibraryControl()
		{
			InitializeComponent();
		}

		private IAiPromptbausteinComplexViewModel ViewModel => DataContext as IAiPromptbausteinComplexViewModel;

		public static readonly DependencyProperty PromptActivatedCommandProperty =
			DependencyProperty.Register("PromptActivatedCommand", typeof(ICommand),
				typeof(AiPromptbausteinLibraryControl), new PropertyMetadata(null));

		public static readonly DependencyProperty RoutineActivatedCommandProperty =
			DependencyProperty.Register("RoutineActivatedCommand", typeof(ICommand),
				typeof(AiPromptbausteinLibraryControl), new PropertyMetadata(null));

		/// <summary>
		/// Wird bei Doppelklick auf einen Prompt ausgeführt (Verwaltung: Bearbeiten, Auswahl: Senden).
		/// </summary>
		public ICommand PromptActivatedCommand
		{
			get { return (ICommand)GetValue(PromptActivatedCommandProperty); }
			set { SetValue(PromptActivatedCommandProperty, value); }
		}

		/// <summary>
		/// Wird bei Doppelklick auf eine Routine ausgeführt (Verwaltung: Bearbeiten, Auswahl: Senden).
		/// </summary>
		public ICommand RoutineActivatedCommand
		{
			get { return (ICommand)GetValue(RoutineActivatedCommandProperty); }
			set { SetValue(RoutineActivatedCommandProperty, value); }
		}

		public static readonly DependencyProperty IsEditModeProperty =
			DependencyProperty.Register("IsEditMode", typeof(bool),
				typeof(AiPromptbausteinLibraryControl), new PropertyMetadata(true, OnIsEditModeChanged));

		/// <summary>
		/// Schaltet den Bearbeitungsmodus (Kontextmenüs, Edit-Shortcuts, Anlegen-Buttons,
		/// Ordner-Doppelklick-Bearbeiten). Default: eingeschaltet.
		/// </summary>
		public bool IsEditMode
		{
			get { return (bool)GetValue(IsEditModeProperty); }
			set { SetValue(IsEditModeProperty, value); }
		}

		static void OnIsEditModeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
		{
			var control = (AiPromptbausteinLibraryControl)d;
			control.UpdateEditMode((bool)e.NewValue);
		}

		private Dictionary<FrameworkElement, InputBinding[]> _DisabledInputBindings;

		void UpdateEditMode(bool isEditMode)
		{
			if (!isEditMode)
			{
				if (_DisabledInputBindings != null)
					return;

				_DisabledInputBindings = new Dictionary<FrameworkElement, InputBinding[]>();

				foreach (var element in new FrameworkElement[] { treeView, tabItemAlle, tabItemPrompts, tabItemRoutinen })
				{
					_DisabledInputBindings[element] = element.InputBindings.Cast<InputBinding>().ToArray();
					element.InputBindings.Clear();
				}
			}
			else
			{
				if (_DisabledInputBindings == null)
					return;

				foreach (var entry in _DisabledInputBindings)
					foreach (var binding in entry.Value)
						entry.Key.InputBindings.Add(binding);

				_DisabledInputBindings = null;
			}
		}

		/// <summary>
		/// Setzt die initiale Selektion zurück (erstes TreeViewItem an- und wieder abwählen),
		/// damit beim Öffnen kein Ordner vorselektiert ist.
		/// </summary>
		public void ResetInitialSelection()
		{
			if (treeView.ItemContainerGenerator.ContainerFromIndex(0) is TreeViewItem item)
			{
				item.IsSelected = true;
				item.IsSelected = false;
			}

			listBoxEdit1.UnSelectAll();
		}

		private void OnPreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
		{
			TreeViewItem treeViewItem = VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject);

			if (treeViewItem != null)
			{
				treeViewItem.Focus();
				e.Handled = true;
			}
			else
			{
				e.Handled = true;

				if (ViewModel?.SelectedFolder == null)
					return;

				_LastTreeViewItem.IsSelected = false;

				treeView.Focus();
			}
		}

		static T VisualUpwardSearch<T>(DependencyObject source) where T : DependencyObject
		{
			while (source != null && !(source is T))
				source = VisualTreeHelper.GetParent(source);

			return source as T;
		}

		private void treeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
		{
			if (ViewModel is null)
				return;

			ViewModel.SelectedFolder = treeView.SelectedValue as AiPromptbausteinFolderVM;
		}

		private void Grid_PreviewMouseDown(object sender, MouseButtonEventArgs e)
		{
			TreeViewItem treeViewItem = VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject);

			if (treeViewItem is null)
			{
				treeView.Focus();
				e.Handled = true;
				return;
			}

			if (e.ClickCount == 2)
			{
				if (!IsEditMode)
					return;

				if (!ViewModel.OpenEditFolderDialogCommand.CanExecute(null))
					return;

				ViewModel.OpenEditFolderDialogCommand.Execute(null);
				e.Handled = true;
			}
		}

		private TreeViewItem _LastTreeViewItem;
		private void treeView_Selected(object sender, RoutedEventArgs e)
		{
			_LastTreeViewItem = e.OriginalSource as TreeViewItem;
		}

		private void treeView_ContextMenuOpening(object sender, ContextMenuEventArgs e)
		{
			if (!IsEditMode)
			{
				e.Handled = true;
				return;
			}

			ViewModel?.UpdateFolderCommands();
		}

		private void ListBox_ContextMenuOpening(object sender, ContextMenuEventArgs e)
		{
			if (!IsEditMode)
			{
				e.Handled = true;
				return;
			}

			ViewModel?.UpdatePromptCommands();
		}

		private void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
		{
			Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));
			e.Handled = true;
		}

		private void Grid_PreviewMouseDown_1(object sender, MouseButtonEventArgs e)
		{
			var cmd = PromptActivatedCommand;

			if (cmd == null || !cmd.CanExecute(null))
				return;

			if (e.ClickCount == 2)
			{
				cmd.Execute(null);
				e.Handled = true;
			}
		}

		private void Grid_PreviewMouseDown_2(object sender, MouseButtonEventArgs e)
		{
			var cmd = RoutineActivatedCommand;

			if (cmd == null || !cmd.CanExecute(null))
				return;

			if (e.ClickCount == 2)
			{
				cmd.Execute(null);
				e.Handled = true;
			}
		}

		private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
		{
			if (e.OriginalSource is TabControl)
			{
				listBoxEdit1.UnSelectAll();
				listBoxEdit2.UnSelectAll();
				listBoxEdit3.UnSelectAll();
			}
		}

		private void listBoxEdit3_PreviewMouseDown(object sender, MouseButtonEventArgs e)
		{
			return;

			if (!(e.OriginalSource is UIElement))
			{
				return;
			}

			ListBoxItem listBoxItem = VisualUpwardSearch<ListBoxItem>(e.OriginalSource as DependencyObject);

			if (listBoxItem is null)
			{
				((ListBoxEdit)sender).Focus();
				e.Handled = true;
				return;
			}
		}
	}
}