경로 선택 탐색기 팝업 기능 구현

- StandaloneFileBrowser 에셋을 활용한 방법
- dll을 활용한 방법
- 유니티 에디터 자체 기능을 활용한 방

Assets/StandaloneFileBrowser/StandaloneFileBrowserLinux.cs

@@ -0,0 +1,115 @@
+#if UNITY_STANDALONE_LINUX
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace SFB {
+
+    public class StandaloneFileBrowserLinux : IStandaloneFileBrowser {
+        
+        private static Action<string[]> _openFileCb;
+        private static Action<string[]> _openFolderCb;
+        private static Action<string> _saveFileCb;
+
+        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
+        public delegate void AsyncCallback(string path);
+
+        [DllImport("StandaloneFileBrowser")]
+        private static extern void DialogInit();
+        [DllImport("StandaloneFileBrowser")]
+        private static extern IntPtr DialogOpenFilePanel(string title, string directory, string extension, bool multiselect);
+        [DllImport("StandaloneFileBrowser")]
+        private static extern void DialogOpenFilePanelAsync(string title, string directory, string extension, bool multiselect, AsyncCallback callback);
+        [DllImport("StandaloneFileBrowser")]
+        private static extern IntPtr DialogOpenFolderPanel(string title, string directory, bool multiselect);
+        [DllImport("StandaloneFileBrowser")]
+        private static extern void DialogOpenFolderPanelAsync(string title, string directory, bool multiselect, AsyncCallback callback);
+        [DllImport("StandaloneFileBrowser")]
+        private static extern IntPtr DialogSaveFilePanel(string title, string directory, string defaultName, string extension);
+        [DllImport("StandaloneFileBrowser")]
+        private static extern void DialogSaveFilePanelAsync(string title, string directory, string defaultName, string extension, AsyncCallback callback);
+
+        public StandaloneFileBrowserLinux()
+        {
+            DialogInit();
+        }
+
+        public string[] OpenFilePanel(string title, string directory, ExtensionFilter[] extensions, bool multiselect) {
+            var paths = Marshal.PtrToStringAnsi(DialogOpenFilePanel(
+                title,
+                directory,
+                GetFilterFromFileExtensionList(extensions),
+                multiselect));
+            return paths.Split((char)28);
+        }
+
+        public void OpenFilePanelAsync(string title, string directory, ExtensionFilter[] extensions, bool multiselect, Action<string[]> cb) {
+            _openFileCb = cb;
+            DialogOpenFilePanelAsync(
+                title,
+                directory,
+                GetFilterFromFileExtensionList(extensions),
+                multiselect,
+                (string result) => { _openFileCb.Invoke(result.Split((char)28)); });
+        }
+
+        public string[] OpenFolderPanel(string title, string directory, bool multiselect) {
+            var paths = Marshal.PtrToStringAnsi(DialogOpenFolderPanel(
+                title,
+                directory,
+                multiselect));
+            return paths.Split((char)28);
+        }
+
+        public void OpenFolderPanelAsync(string title, string directory, bool multiselect, Action<string[]> cb) {
+            _openFolderCb = cb;
+            DialogOpenFolderPanelAsync(
+                title,
+                directory,
+                multiselect,
+                (string result) => { _openFolderCb.Invoke(result.Split((char)28)); });
+        }
+
+        public string SaveFilePanel(string title, string directory, string defaultName, ExtensionFilter[] extensions) {
+            return Marshal.PtrToStringAnsi(DialogSaveFilePanel(
+                title,
+                directory,
+                defaultName,
+                GetFilterFromFileExtensionList(extensions)));
+        }
+
+        public void SaveFilePanelAsync(string title, string directory, string defaultName, ExtensionFilter[] extensions, Action<string> cb) {
+            _saveFileCb = cb;
+            DialogSaveFilePanelAsync(
+                title,
+                directory,
+                defaultName,
+                GetFilterFromFileExtensionList(extensions),
+                (string result) => { _saveFileCb.Invoke(result); });
+        }
+
+        private static string GetFilterFromFileExtensionList(ExtensionFilter[] extensions) {
+            if (extensions == null) {
+                return "";
+            }
+
+            var filterString = "";
+            foreach (var filter in extensions) {
+                filterString += filter.Name + ";";
+
+                foreach (var ext in filter.Extensions) {
+                    filterString += ext + ",";
+                }
+
+                filterString = filterString.Remove(filterString.Length - 1);
+                filterString += "|";
+            }
+            filterString = filterString.Remove(filterString.Length - 1);
+            return filterString;
+        }
+    }
+}
+
+#endif