mattercontrol/Library/Widgets/InsertionGroup.cs

/*
Copyright (c) 2017, Kevin Pope, John Lewin
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MatterHackers.DataConverters3D;
using MatterHackers.MatterControl.Library;
using MatterHackers.MatterControl.PartPreviewWindow;
using MatterHackers.MeshVisualizer;
using MatterHackers.PolygonMesh;
using MatterHackers.VectorMath;

namespace MatterHackers.MatterControl.PrintLibrary
{
	public class InsertionGroup : Object3D
	{
		public event EventHandler ContentLoaded;

		internal static Mesh placeHolderMesh;

		private InteractiveScene scene;
		private View3DWidget view3DWidget;

		public Task LoadingItemsTask { get; }

		static InsertionGroup()
		{
			// 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 InsertionGroup(IEnumerable<ILibraryItem> items, View3DWidget view3DWidget, InteractiveScene scene, Vector2 bedCenter, Func<bool> dragOperationActive)
		{
			// Add a temporary placeholder to give us some bounds
			this.Mesh = InsertionGroup.placeHolderMesh;
			this.scene = scene;
			this.view3DWidget = view3DWidget;

			this.LoadingItemsTask = Task.Run((Func<Task>)(async () =>
			{
				var newItemOffset = Vector2.Zero;
				if (!dragOperationActive())
				{
					newItemOffset = bedCenter;
				}

				var offset = Matrix4X4.Identity;

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

				this.Children.Add(placeholderItem);

				// Filter to content file types only
				foreach (var item in items.Where(item => item.IsContentFileType()).ToList())
				{
					this.Mesh = null;

					// Acquire
					var progressControl = new DragDropLoadProgress(view3DWidget, null);

					// 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(Matrix4X4.Identity);

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

						// HACK: set Parent ourselves so it can be used in the progress control
						loadedItem.Parent = this;

						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;
						loadedItem.Color = loadedItem.Color;

						// Notification should force invalidate and redraw
						//progressReporter?.Invoke(1, "");

						this.Children.Add(loadedItem);

						loadedItem.MakeNameNonColliding();

						// Wait for content to load

						// Adjust next item position
						// TODO: do something more interesting than increment in x
						newItemOffset.X = loadedItem.GetAxisAlignedBoundingBox(Matrix4X4.Identity).XSize/2 + 10;
					}

					progressControl.ProgressReporter(1.3, "");
				}

				this.Children.Remove(placeholderItem);

				this.ContentAcquired = true;

				ContentLoaded?.Invoke(this, null);

				if (!dragOperationActive())
				{
					this.Collapse();
				}

				this.Invalidate();
			}));
		}

		/// <summary>
		/// Indicates if all content has been acquired or if pending operations are still active
		/// </summary>
		public bool ContentAcquired { get; set; } = false;

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

			// Collapse our contents into the root of the scene
			// of the scene when it loses focus
			scene.Children.Modify(list =>
			{
				this.CollapseInto(list, Object3DTypes.Any);
			});

			// Create and push the undo operation
			foreach (var item in loadedItems)
			{
				view3DWidget.AddUndoOperation(new InsertCommand(scene, item));
			}

			if (scene.SelectedItem == this
				&& loadedItems.Count > 0)
			{
				scene.ClearSelection();

				foreach (var item in loadedItems)
				{
					scene.AddToSelection(item);
				}
			}
		}
	}
}