mattercontrol/PartPreviewWindow/View3D/Actions/MeshWrapperObject3D.cs

/*
Copyright (c) 2017, Lars Brubaker, John Lewin
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

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   list of conditions and the following disclaimer.
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   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

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*/

using MatterHackers.Agg.UI;
using MatterHackers.DataConverters3D;
using MatterHackers.DataConverters3D.UndoCommands;
using MatterHackers.MatterControl.DesignTools.Operations;
using MatterHackers.PolygonMesh;
using System.Collections.Generic;
using System.Linq;
using System.Threading;

namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
{
	public abstract class MeshWrapperObject3D : Object3D
	{
		public MeshWrapperObject3D()
		{
		}

		public override bool CanApply => true;
		public override bool CanRemove => true;

		public override void Apply(UndoBuffer undoBuffer)
		{
			var meshWrappers = this.Descendants().Where(o => o.OwnerID == this.ID).ToList();

			// remove all the meshWrappers (collapse the children)
			foreach (var meshWrapper in meshWrappers)
			{
				if (meshWrapper.Visible)
				{
					// clear the children
					meshWrapper.Children.Modify(list =>
					{
						list.Clear();
					});
					meshWrapper.OwnerID = null;
				}
				else
				{
					// remove it
					meshWrapper.Parent.Children.Remove(meshWrapper);
				}
			}

			base.Apply(undoBuffer);
		}

		public IEnumerable<(IObject3D original, IObject3D meshCopy)> WrappedObjects()
		{
			return this.Descendants()
				.Where((obj) => obj.OwnerID == this.ID)
				.Select((mw) => (mw.Children.First(), mw));
		}

		public override void Remove(UndoBuffer undoBuffer)
		{
			SuspendRebuild();

			// remove all the mesh wrappers that we own
			var meshWrappers = this.Descendants().Where(o => o.OwnerID == this.ID).ToList();
			foreach (var meshWrapper in meshWrappers)
			{
				meshWrapper.Remove(null);
			}
			foreach (var child in Children)
			{
				child.OutputType = PrintOutputTypes.Default;
			}

			// collapse our children into our parent
			base.Remove(null);
			ResumeRebuild();

			Invalidate(new InvalidateArgs(this, InvalidateType.Content));
		}

		public void ResetMeshWrapperMeshes(Object3DPropertyFlags flags, CancellationToken cancellationToken)
		{
			SuspendRebuild();

			this.DebugDepth("Reset MWM");

			// Remove evrything above the objects that have the meshes we are wrapping that are mesh wrappers
			var wrappers = this.Descendants().Where(o => o.OwnerID == this.ID).ToList();
			foreach (var wrapper in wrappers)
			{
				wrapper.SuspendRebuild();

				var remove = wrapper.Parent;
				while (remove is MeshWrapper)
				{
					var hold = remove;
					remove.Remove(null);
					remove = hold.Parent;
				}

				wrapper.ResumeRebuild();
			}

			// if there are not already, wrap all meshes with our id (some inner object may have changed it's meshes)
			AddMeshWrapperToAllChildren();

			this.Mesh = null;
			var participants = this.Descendants().Where(o => o.OwnerID == this.ID).ToList();
			foreach (var item in participants)
			{
				var firstChild = item.Children.First();
				item.SuspendRebuild();
				// set the mesh back to a copy of the child mesh
				item.Mesh = Mesh.Copy(firstChild.Mesh, cancellationToken);
				// and reset the properties
				item.CopyProperties(firstChild, flags & (~Object3DPropertyFlags.Matrix));
				item.ResumeRebuild();
			}

			ResumeRebuild();
		}

		public void WrapSelectedItemAndSelect(InteractiveScene scene)
		{
			SuspendRebuild();
			var selectedItems = scene.GetSelectedItems();

			if (selectedItems.Count > 0)
			{
				// clear the selected item
				scene.SelectedItem = null;

				WrapItems(selectedItems);

				scene.UndoBuffer.AddAndDo(
					new ReplaceCommand(
						new List<IObject3D>(selectedItems),
						new List<IObject3D> { this }));

				// and select this
				scene.SelectedItem = this;
			}

			ResumeRebuild();

			if (!RebuildSuspended)
			{
				Rebuild(null);
			}
		}

		public void WrapItems(List<IObject3D> items)
		{
			SuspendRebuild();
			var clonedItemsToAdd = new List<IObject3D>(items.Select((i) => i.Clone()));

			Children.Modify((list) =>
			{
				list.Clear();

				foreach (var child in clonedItemsToAdd)
				{
					list.Add(child);
				}
			});

			AddMeshWrapperToAllChildren();

			this.MakeNameNonColliding();

			ResumeRebuild();

			if (!RebuildSuspended)
			{
				Rebuild(null);
			}
		}

		private void AddMeshWrapperToAllChildren()
		{
			// Wrap every first descendant that has a mesh
			foreach (var child in this.VisibleMeshes().ToList())
			{
				// have to check that NO child of the visible mesh has us as the parent id
				if (!child.DescendantsAndSelf().Where((c) => c.OwnerID == this.ID).Any())
				{
					// wrap the child
					child.Parent.Children.Modify((list) =>
					{
						list.Remove(child);
						list.Add(new MeshWrapper(child, this.ID));
					});
				}
			}
		}
	}
}