A game about forced loneliness, made by TACStudios
tacstudios.tngl.sh
1using System;
2using System.Collections.Generic;
3using UnityEngine;
4
5namespace UnityEditor.U2D.Animation
6{
7 [Serializable]
8 internal abstract class SerializableSelection<T> : ISelection<T>, ISerializationCallbackReceiver
9 {
10 internal static readonly int kInvalidID = -1;
11
12 [SerializeField]
13 private T[] m_Keys = new T[0];
14
15 private HashSet<T> m_Selection = new HashSet<T>();
16 private HashSet<T> m_TemporalSelection = new HashSet<T>();
17 private bool m_SelectionInProgress = false;
18
19 public int Count => m_Selection.Count + m_TemporalSelection.Count;
20
21 public T activeElement
22 {
23 get { return First(); }
24 set
25 {
26 Clear();
27 Select(value, true);
28 }
29 }
30
31 public T[] elements
32 {
33 get
34 {
35 var set = m_Selection;
36
37 if (m_SelectionInProgress)
38 {
39 var union = new HashSet<T>(m_Selection);
40 union.UnionWith(m_TemporalSelection);
41 set = union;
42 }
43
44 return new List<T>(set).ToArray();
45 }
46 set
47 {
48 Clear();
49 foreach (var element in value)
50 Select(element, true);
51 }
52 }
53
54 protected abstract T GetInvalidElement();
55
56 public void Clear()
57 {
58 GetSelection().Clear();
59 }
60
61 public void BeginSelection()
62 {
63 m_SelectionInProgress = true;
64 Clear();
65 }
66
67 public void EndSelection(bool select)
68 {
69 m_SelectionInProgress = false;
70
71 if (select)
72 m_Selection.UnionWith(m_TemporalSelection);
73 else
74 m_Selection.ExceptWith(m_TemporalSelection);
75
76 m_TemporalSelection.Clear();
77 }
78
79 public void Select(T element, bool select)
80 {
81 if (EqualityComparer<T>.Default.Equals(element, GetInvalidElement()))
82 return;
83
84 if (select)
85 GetSelection().Add(element);
86 else if (Contains(element))
87 GetSelection().Remove(element);
88 }
89
90 public bool Contains(T element)
91 {
92 return m_Selection.Contains(element) || m_TemporalSelection.Contains(element);
93 }
94
95 private HashSet<T> GetSelection()
96 {
97 if (m_SelectionInProgress)
98 return m_TemporalSelection;
99
100 return m_Selection;
101 }
102
103 private T First()
104 {
105 T element = First(m_Selection);
106
107 if (EqualityComparer<T>.Default.Equals(element, GetInvalidElement()))
108 element = First(m_TemporalSelection);
109
110 return element;
111 }
112
113 private T First(HashSet<T> set)
114 {
115 if (set.Count == 0)
116 return GetInvalidElement();
117
118 using (var enumerator = set.GetEnumerator())
119 {
120 Debug.Assert(enumerator.MoveNext());
121 return enumerator.Current;
122 }
123 }
124
125 void ISerializationCallbackReceiver.OnBeforeSerialize()
126 {
127 m_Keys = new List<T>(m_Selection).ToArray();
128 }
129
130 void ISerializationCallbackReceiver.OnAfterDeserialize()
131 {
132 elements = m_Keys;
133 }
134 }
135}