U3D 复制曲线

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using UnityEngine;
using UnityEditor;

[CustomPropertyDrawer(typeof(AnimationCurve))]
public class CurvePropertyDrawer: PropertyDrawer {
	
	private const int _buttonWidth = 12;
	
	private static Keyframe[] _buffer;
	private static WrapMode _preWrapMode;
	private static WrapMode _postWrapMode;
	
	public override void OnGUI(Rect pos, SerializedProperty prop, GUIContent label) {
		prop.animationCurveValue = EditorGUI.CurveField(
			new Rect(pos.x, pos.y, pos.width - _buttonWidth * 2, pos.height),
			label,
			prop.animationCurveValue
			);
		// Copy
		if (
			GUI.Button(
			new Rect(pos.x + pos.width - _buttonWidth * 2, pos.y, _buttonWidth, pos.height),
			""
			)
			) {
			_buffer = prop.animationCurveValue.keys;
			_preWrapMode = prop.animationCurveValue.preWrapMode;
			_postWrapMode = prop.animationCurveValue.postWrapMode;
		}
		GUI.Label(
			new Rect(pos.x + pos.width - _buttonWidth * 2, pos.y, _buttonWidth, pos.height),
			"C"
			);
		// Paste
		if (_buffer == null) return;
		if (
			GUI.Button(
			new Rect(pos.x + pos.width - _buttonWidth, pos.y, _buttonWidth, pos.height),
			""
			)
			) {
			AnimationCurve newAnimationCurve = new AnimationCurve(_buffer);
			newAnimationCurve.preWrapMode = _preWrapMode;
			newAnimationCurve.postWrapMode = _postWrapMode;
			prop.animationCurveValue = newAnimationCurve;
		}
		GUI.Label(
			new Rect(pos.x + pos.width - _buttonWidth, pos.y, _buttonWidth, pos.height),
			"P"
			);
	} // OnGUI()
	
} // class CurvePropertyDrawer