79 lines
2.6 KiB
C#
79 lines
2.6 KiB
C#
namespace UnityEngine.InputSystem.Utilities
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{
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// Keeps a copy of the callback list while executing so that the callback list can safely
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// be mutated from within callbacks.
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internal struct CallbackArray<TDelegate>
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where TDelegate : System.Delegate
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{
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private bool m_CannotMutateCallbacksArray;
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private InlinedArray<TDelegate> m_Callbacks;
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private InlinedArray<TDelegate> m_CallbacksToAdd;
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private InlinedArray<TDelegate> m_CallbacksToRemove;
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public int length => m_Callbacks.length;
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public TDelegate this[int index] => m_Callbacks[index];
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public void Clear()
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{
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m_Callbacks.Clear();
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m_CallbacksToAdd.Clear();
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m_CallbacksToRemove.Clear();
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}
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public void AddCallback(TDelegate dlg)
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{
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if (m_CannotMutateCallbacksArray)
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{
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if (m_CallbacksToAdd.Contains(dlg))
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return;
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var removeIndex = m_CallbacksToRemove.IndexOf(dlg);
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if (removeIndex != -1)
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m_CallbacksToRemove.RemoveAtByMovingTailWithCapacity(removeIndex);
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m_CallbacksToAdd.AppendWithCapacity(dlg);
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return;
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}
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if (!m_Callbacks.Contains(dlg))
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m_Callbacks.AppendWithCapacity(dlg, capacityIncrement: 4);
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}
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public void RemoveCallback(TDelegate dlg)
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{
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if (m_CannotMutateCallbacksArray)
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{
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if (m_CallbacksToRemove.Contains(dlg))
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return;
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var addIndex = m_CallbacksToAdd.IndexOf(dlg);
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if (addIndex != -1)
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m_CallbacksToAdd.RemoveAtByMovingTailWithCapacity(addIndex);
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m_CallbacksToRemove.AppendWithCapacity(dlg);
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return;
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}
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var index = m_Callbacks.IndexOf(dlg);
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if (index >= 0)
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m_Callbacks.RemoveAtWithCapacity(index);
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}
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public void LockForChanges()
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{
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m_CannotMutateCallbacksArray = true;
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}
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public void UnlockForChanges()
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{
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m_CannotMutateCallbacksArray = false;
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// Process mutations that have happened while we were executing callbacks.
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for (var i = 0; i < m_CallbacksToRemove.length; ++i)
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RemoveCallback(m_CallbacksToRemove[i]);
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for (var i = 0; i < m_CallbacksToAdd.length; ++i)
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AddCallback(m_CallbacksToAdd[i]);
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m_CallbacksToAdd.Clear();
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m_CallbacksToRemove.Clear();
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}
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}
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}
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