Unity编辑器-获取Projectwindow中拖拽内容的路径

参考

Unity Editor 实现给属性面板上拖拽赋值资源路径

API

Event
DragAndDrop

示例

Mono脚本

using UnityEngine;
public class TestScene : MonoBehaviour
{
    [SerializeField] string testName;
}

Editor脚本
重写InspectorGUI，在该函数中通过Event的Type参数获取当前的拖拽类型
拖拽中，如果鼠标指针进入目标区域，修改鼠标指针
拖拽释放，判断鼠标是否在目标区域，如果是，获取拖拽内容的路径
注意：不设置鼠标指针为通用状态无法获取拖拽对象的路径

using UnityEditor;
[CustomEditor(typeof(TestScene))]
public class TestSceneInspector : Editor
{
    SerializedProperty testName;

    private void OnEnable()
    {
        testName = serializedObject.FindProperty(nameof(testName));
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        EditorGUILayout.PropertyField(testName, new GUIContent("测试"));

        if (GetDragObjectPathsInProjectWindow(GUILayoutUtility.GetLastRect(), out string[] paths))
        {
            if (paths.Length > 0)
                testName.stringValue = System.IO.Path.GetFileNameWithoutExtension(paths[0]);
        }
        serializedObject.ApplyModifiedProperties();
    }

    bool GetDragObjectPathsInProjectWindow(Rect targetRect, out string[] paths)
    {
        //拖拽提示
        if (Event.current.type == EventType.DragUpdated)
        {
            Event.current.Use();
            if (DragObjectInArea(targetRect))
                DragAndDrop.visualMode = DragAndDropVisualMode.Generic;//鼠标指针修改为通用拖拽模式，设置为该模式该可以获取拖拽对象的路径
            else
                DragAndDrop.visualMode = DragAndDropVisualMode.None;//鼠标指针修改为无指示模式         
        }

        //拖拽释放并且在目标区域内
        if (Event.current.type == EventType.DragPerform && DragObjectInArea(targetRect))
        {
            Event.current.Use();
            paths = DragAndDrop.paths;
            return true;
        }
        else
        {
            paths = null;
            return false;
        }

        bool DragObjectInArea(Rect rect)
        {
            return rect.Contains(Event.current.mousePosition);
        }
    }
}