146 lines
4.1 KiB
C#
146 lines
4.1 KiB
C#
// Copyright (c) 2012-2022 Wojciech Figat. All rights reserved.
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using System;
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using FlaxEngine;
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using Object = FlaxEngine.Object;
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namespace FlaxEditor.Viewport.Previews
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{
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/// <summary>
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/// Prefab asset preview editor viewport.
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/// </summary>
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/// <seealso cref="AssetPreview" />
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public class PrefabPreview : AssetPreview
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{
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/// <summary>
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/// The preview that is during prefab instance spawning. Used to link some actors such as UIControl to preview scene and view.
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/// </summary>
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internal static PrefabPreview LoadingPreview;
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private Prefab _prefab;
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private Actor _instance;
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internal UIControl customControlLinked;
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/// <summary>
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/// Gets or sets the prefab asset to preview.
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/// </summary>
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public Prefab Prefab
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{
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get => _prefab;
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set
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{
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if (_prefab == value)
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return;
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// Unset and cleanup spawned instance
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if (_instance)
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{
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var instance = _instance;
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Instance = null;
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Object.Destroy(instance);
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}
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_prefab = value;
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if (_prefab)
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{
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// Load prefab
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_prefab.WaitForLoaded();
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// Spawn prefab
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var prevPreview = LoadingPreview;
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LoadingPreview = this;
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var instance = PrefabManager.SpawnPrefab(_prefab, null);
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LoadingPreview = prevPreview;
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if (instance == null)
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{
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_prefab = null;
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throw new Exception("Failed to spawn a prefab for the preview.");
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}
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// Set instance
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Instance = instance;
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}
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}
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}
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/// <summary>
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/// Gets the instance of the prefab spawned for the preview.
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/// </summary>
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public Actor Instance
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{
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get => _instance;
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internal set
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{
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if (_instance == value)
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return;
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if (_instance)
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{
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// Unlink UI control
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if (customControlLinked)
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{
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if (customControlLinked.Control?.Parent == this)
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customControlLinked.Control.Parent = null;
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customControlLinked = null;
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}
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// Remove for the preview
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Task.RemoveCustomActor(_instance);
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}
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_instance = value;
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if (_instance)
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{
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// Add to the preview
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Task.AddCustomActor(_instance);
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// Link UI canvases to the preview
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LinkCanvas(_instance);
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}
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}
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}
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private void LinkCanvas(Actor actor)
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{
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if (actor is UICanvas uiCanvas)
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uiCanvas.EditorOverride(Task, this);
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var children = actor.ChildrenCount;
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for (int i = 0; i < children; i++)
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{
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LinkCanvas(actor.GetChild(i));
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="PrefabPreview"/> class.
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/// </summary>
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/// <param name="useWidgets">if set to <c>true</c> use widgets.</param>
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public PrefabPreview(bool useWidgets)
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: base(useWidgets)
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{
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}
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/// <inheritdoc />
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public override void Update(float deltaTime)
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{
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base.Update(deltaTime);
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if (_instance != null)
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{
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// Link UI canvases to the preview (eg. after canvas added to the prefab)
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LinkCanvas(_instance);
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}
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}
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/// <inheritdoc />
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public override void OnDestroy()
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{
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Prefab = null;
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base.OnDestroy();
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}
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}
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}
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