using UnityEditor;using UnityEngine;[CustomEditor(typeof(EditParticleSystem))]public class EditParticleSystemInspector : Editor{    /// <summary>    /// 滑動杆的當前時間    /// </summary>    private float m_CurTime;        /// <summary>    /// 當前是否是預覽播放狀態    /// </summary>    private bool m_Playing;    /// <summary>    /// 當前執行時間    /// </summary>    private float m_RunningTime;        /// <summary>    /// 上一次系統時間    /// </summary>    private double m_PreviousTime;    /// <summary>    /// 滑動杆總長度    /// </summary>    private const float kDuration = 30f;    private ParticleSystem m_ParticleSystem;    private EditParticleSystem editAnimator { get { return target as EditParticleSystem; } }    private ParticleSystem particleSystem    {        get { return m_ParticleSystem ?? (m_ParticleSystem = editAnimator.GetComponentInChildren<ParticleSystem>()); }    }    void OnEnable()    {        m_PreviousTime = EditorApplication.timeSinceStartup;        EditorApplication.update += inspectorUpdate;    }    void OnDisable()    {        EditorApplication.update -= inspectorUpdate;    }    public override void OnInspectorGUI()    {        EditorGUILayout.BeginHorizontal();        if (GUILayout.Button("Play"))        {            play();        }        if (GUILayout.Button("Stop"))        {            stop();        }        EditorGUILayout.EndHorizontal();        m_CurTime = EditorGUILayout.Slider("Time:", m_CurTime, 0f, kDuration);        manualUpdate();    }    /// <summary>    /// 進行預覽播放    /// </summary>    private void play()    {        if (Application.isPlaying || particleSystem == null)        {            return;        }        m_RunningTime = 0f;        m_Playing = true;    }    /// <summary>    /// 停止預覽播放    /// </summary>    private void stop()    {        if (Application.isPlaying || particleSystem == null)        {            return;        }        m_Playing = false;        m_CurTime = 0f;    }    /// <summary>    /// 預覽播放狀態下的更新    /// </summary>    private void update()    {        if (Application.isPlaying || particleSystem == null)        {            return;        }        if (m_RunningTime >= kDuration)        {            m_Playing = false;            return;        }        particleSystem.Simulate(m_RunningTime, true);        SceneView.RepaintAll();        Repaint();        m_CurTime = m_RunningTime;    }    /// <summary>    /// 非預覽播放狀態下，通過滑桿來播放當前動畫幀    /// </summary>    private void manualUpdate()    {        if (particleSystem && !m_Playing)        {            particleSystem.Simulate(m_CurTime, true);            SceneView.RepaintAll();        }    }    private void inspectorUpdate()    {        var delta = EditorApplication.timeSinceStartup - m_PreviousTime;        m_PreviousTime = EditorApplication.timeSinceStartup;        if (!Application.isPlaying && m_Playing)        {            m_RunningTime = Mathf.Clamp(m_RunningTime + (float)delta, 0f, kDuration);            update();        }    }}