mattercontrol/MatterControlLib/Library/Widgets/InsertionGroupObject3D.cs

/*
Copyright (c) 2022, Kevin Pope, John Lewin, Lars Brubaker
All rights reserved.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MatterHackers.DataConverters3D;
using MatterHackers.MatterControl.DesignTools.Operations;
using MatterHackers.MatterControl.PartPreviewWindow;
using MatterHackers.PolygonMesh;
using MatterHackers.VectorMath;

namespace MatterHackers.MatterControl.Library
{
	public class InsertionGroupObject3D : Object3D
	{
		internal static Mesh placeHolderMesh;

		private View3DWidget view3DWidget;

		private Action<IObject3D, IEnumerable<IObject3D>> layoutParts;

		public Task LoadingItemsTask { get; }

		static InsertionGroupObject3D()
		{
			// Create the placeholder mesh and position it at z0
			placeHolderMesh = PlatonicSolids.CreateCube(20, 20, 20);
			placeHolderMesh.Translate(new Vector3(0, 0, 10));
		}

		// TODO: Figure out how best to collapse the InsertionGroup after the load task completes
		public InsertionGroupObject3D(IEnumerable<ILibraryItem> items,
			View3DWidget view3DWidget,
			InteractiveScene scene,
			Vector2 newItemOffset,
			Action<IObject3D, IEnumerable<IObject3D>> layoutParts,
			bool trackSourceFiles = false,
			bool addUndoCheckPoint = true)
		{
			if (items == null)
			{
				return;
			}

			this.layoutParts = layoutParts;

			// Add a temporary placeholder to give us some bounds
			this.view3DWidget = view3DWidget;

			this.LoadingItemsTask = Task.Run(async () =>
			{
				var offset = Matrix4X4.Identity;

				// Add the placeholder 'Loading...' object
				var placeholderItem = new Object3D()
				{
					Mesh = placeHolderMesh,
					Matrix = Matrix4X4.Identity,
					Parent = this
				};

				this.Children.Add(placeholderItem);

				var itemsToLoad = items.Where(item => item.IsContentFileType()).ToList();
				// Filter to content file types only
				foreach (var item in itemsToLoad)
				{
					// Acquire
					var progressControl = new DragDropLoadProgress(view3DWidget, null, ApplicationController.Instance.Theme);

					// Position at accumulating offset
					placeholderItem.Matrix *= Matrix4X4.CreateTranslation(newItemOffset.X, (double)newItemOffset.Y, 0);
					placeholderItem.Visible = true;
					progressControl.TrackingObject = placeholderItem;

					var loadedItem = await item.CreateContent(progressControl.ProgressReporter);
					if (loadedItem != null)
					{
						var aabb = loadedItem.GetAxisAlignedBoundingBox();

						// lets move the cube to the center of the loaded thing
						placeholderItem.Matrix *= Matrix4X4.CreateTranslation(-10 + aabb.XSize / 2, 0, 0);

						placeholderItem.Visible = false;

						// Copy scale/rotation/translation from the source and Center
						loadedItem.Matrix = loadedItem.Matrix * Matrix4X4.CreateTranslation((double)-aabb.Center.X, (double)-aabb.Center.Y, (double)-aabb.MinXYZ.Z) * placeholderItem.Matrix;

						// check if the item has 0 height (it is probably an image)
						if (loadedItem.ZSize() == 0)
						{
							// raise it up a bit so it is not z fighting with the bed
							loadedItem.Matrix *= Matrix4X4.CreateTranslation(0, 0, .1);
						}

						loadedItem.Color = loadedItem.Color;

						// Set mesh path if tracking requested
						if (trackSourceFiles
							&& item is FileSystemFileItem fileItem
							&& item.IsMeshFileType())
						{
							loadedItem.MeshPath = fileItem.FilePath;
						}

						this.Children.Add(loadedItem);

						loadedItem.MakeNameNonColliding();

						// Adjust next item position
						newItemOffset.X = loadedItem.GetAxisAlignedBoundingBox().XSize / 2 + 10;
					}

					// the 1.3 is so the progress bar will collapse after going past 1
					progressControl.ProgressReporter(1.3, "");
				}

				this.Children.Remove(placeholderItem);
				this.Collapse(addUndoCheckPoint);

				this.Invalidate(InvalidateType.Children);
			});
		}

		/// <summary>
		/// Collapse the InsertionGroup into the scene
		/// </summary>
		private void Collapse(bool addUndoCheckPoint)
		{
			// Drag operation has finished, we need to perform the collapse
			var loadedItems = this.Children;

			// If we only have one item it may be a mcx wrapper, collapse that first.
			if (loadedItems.Count == 1)
			{
				var first = loadedItems.First();
				if (first.GetType() == typeof(Object3D)
					&& first.Mesh == null
					&& first.Children.Count == 1)
				{
					// collapse our first child into this
					this.Children.Modify(list =>
					{
						first.CollapseInto(list, false);
					});
				}

				loadedItems = this.Children;
			}

			foreach (var item in loadedItems)
			{
				item.Matrix *= this.Matrix;
			}

			view3DWidget.Scene.Children.Remove(this);

			if (layoutParts != null)
			{
				var allBedItems = new List<IObject3D>(view3DWidget.Scene.Children);

				foreach (var item in loadedItems)
				{
					layoutParts?.Invoke(item, allBedItems);
					allBedItems.Add(item);
				}
			}

			if (addUndoCheckPoint)
			{
				view3DWidget.Scene.UndoBuffer.AddAndDo(new InsertCommand(view3DWidget.Scene, loadedItems));
			}
			else
            {
				new InsertCommand(view3DWidget.Scene, loadedItems).Do();
			}
		}
	}
}