137 lines
4.6 KiB
C#
137 lines
4.6 KiB
C#
// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
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using System;
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using System.Collections.Generic;
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using FlaxEngine;
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using FlaxEngine.GUI;
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namespace FlaxEditor.GUI.Drag
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{
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/// <summary>
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/// Scripts references drag handler.
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/// </summary>
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public sealed class DragScripts : DragScripts<DragEventArgs>
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="DragScripts"/> class.
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/// </summary>
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/// <param name="validateFunction">The validation function</param>
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public DragScripts(Func<Script, bool> validateFunction)
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: base(validateFunction)
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{
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}
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}
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/// <summary>
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/// Helper class for handling <see cref="Script"/> instance drag and drop.
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/// </summary>
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/// <seealso cref="Script" />
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public class DragScripts<U> : DragHelper<Script, U> where U : DragEventArgs
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{
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/// <summary>
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/// The default prefix for drag data used for <see cref="Script"/>.
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/// </summary>
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public const string DragPrefix = "SCRIPT!?";
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/// <summary>
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/// Creates a new DragHelper
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/// </summary>
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/// <param name="validateFunction">The validation function</param>
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public DragScripts(Func<Script, bool> validateFunction)
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: base(validateFunction)
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{
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}
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/// <inheritdoc/>
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public override DragData ToDragData(Script item) => GetDragData(item);
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/// <inheritdoc/>
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public override DragData ToDragData(IEnumerable<Script> items) => GetDragData(items);
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/// <summary>
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/// Gets the drag data.
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/// </summary>
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/// <param name="item">The script.</param>
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/// <returns>The data.</returns>
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public static DragData GetDragData(Script item)
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{
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if (item == null)
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throw new ArgumentNullException();
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return new DragDataText(DragPrefix + item.ID.ToString("N"));
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}
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/// <summary>
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/// Gets the drag data.
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/// </summary>
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/// <param name="items">The items.</param>
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/// <returns>The data.</returns>
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public static DragData GetDragData(IEnumerable<Script> items)
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{
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if (items == null)
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throw new ArgumentNullException();
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string text = DragPrefix;
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foreach (var item in items)
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text += item.ID.ToString("N") + '\n';
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return new DragDataText(text);
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}
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/// <summary>
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/// Tries to parse the drag data.
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/// </summary>
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/// <param name="data">The data.</param>
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/// <returns>Gathered objects or empty IEnumerable if cannot get any valid.</returns>
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public override IEnumerable<Script> FromDragData(DragData data)
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{
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if (data is DragDataText dataText)
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{
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if (dataText.Text.StartsWith(DragPrefix))
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{
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// Remove prefix and parse spitted names
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var ids = dataText.Text.Remove(0, DragPrefix.Length).Split('\n');
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var results = new List<Script>(ids.Length);
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for (int i = 0; i < ids.Length; i++)
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{
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if (Guid.TryParse(ids[i], out Guid id))
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{
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var obj = FlaxEngine.Object.Find<Script>(ref id);
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if (obj != null)
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results.Add(obj);
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}
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}
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return results.ToArray();
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}
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}
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return Utils.GetEmptyArray<Script>();
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}
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/// <summary>
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/// Tries to parse the drag data to validate if it has valid scripts drag.
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/// </summary>
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/// <param name="data">The data.</param>
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/// <returns>True if drag data has valid scripts, otherwise false.</returns>
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public static bool IsValidData(DragDataText data)
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{
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if (data.Text.StartsWith(DragPrefix))
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{
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// Remove prefix and parse spitted names
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var ids = data.Text.Remove(0, DragPrefix.Length).Split('\n');
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for (int i = 0; i < ids.Length; i++)
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{
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// Find element
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if (Guid.TryParse(ids[i], out Guid id))
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{
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var obj = FlaxEngine.Object.Find<Script>(ref id);
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// Check it
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if (obj != null)
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return true;
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}
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}
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}
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return false;
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}
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}
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}
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