경로 선택 탐색기 팝업 기능 구현

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

Assets/StandaloneFileBrowser/Plugins/StandaloneFileBrowser.jslib

@@ -0,0 +1,90 @@
+var StandaloneFileBrowserWebGLPlugin = {
+    // Open file.
+    // gameObjectNamePtr: Unique GameObject name. Required for calling back unity with SendMessage.
+    // methodNamePtr: Callback method name on given GameObject.
+    // filter: Filter files. Example filters:
+    //     Match all image files: "image/*"
+    //     Match all video files: "video/*"
+    //     Match all audio files: "audio/*"
+    //     Custom: ".plist, .xml, .yaml"
+    // multiselect: Allows multiple file selection
+    UploadFile: function(gameObjectNamePtr, methodNamePtr, filterPtr, multiselect) {
+        gameObjectName = Pointer_stringify(gameObjectNamePtr);
+        methodName = Pointer_stringify(methodNamePtr);
+        filter = Pointer_stringify(filterPtr);
+
+        // Delete if element exist
+        var fileInput = document.getElementById(gameObjectName)
+        if (fileInput) {
+            document.body.removeChild(fileInput);
+        }
+
+        fileInput = document.createElement('input');
+        fileInput.setAttribute('id', gameObjectName);
+        fileInput.setAttribute('type', 'file');
+        fileInput.setAttribute('style','display:none;');
+        fileInput.setAttribute('style','visibility:hidden;');
+        if (multiselect) {
+            fileInput.setAttribute('multiple', '');
+        }
+        if (filter) {
+            fileInput.setAttribute('accept', filter);
+        }
+        fileInput.onclick = function (event) {
+            // File dialog opened
+            this.value = null;
+        };
+        fileInput.onchange = function (event) {
+            // multiselect works
+            var urls = [];
+            for (var i = 0; i < event.target.files.length; i++) {
+                urls.push(URL.createObjectURL(event.target.files[i]));
+            }
+            // File selected
+            SendMessage(gameObjectName, methodName, urls.join());
+
+            // Remove after file selected
+            document.body.removeChild(fileInput);
+        }
+        document.body.appendChild(fileInput);
+
+        document.onmouseup = function() {
+            fileInput.click();
+            document.onmouseup = null;
+        }
+    },
+
+    // Save file
+    // DownloadFile method does not open SaveFileDialog like standalone builds, its just allows user to download file
+    // gameObjectNamePtr: Unique GameObject name. Required for calling back unity with SendMessage.
+    // methodNamePtr: Callback method name on given GameObject.
+    // filenamePtr: Filename with extension
+    // byteArray: byte[]
+    // byteArraySize: byte[].Length
+    DownloadFile: function(gameObjectNamePtr, methodNamePtr, filenamePtr, byteArray, byteArraySize) {
+        gameObjectName = Pointer_stringify(gameObjectNamePtr);
+        methodName = Pointer_stringify(methodNamePtr);
+        filename = Pointer_stringify(filenamePtr);
+
+        var bytes = new Uint8Array(byteArraySize);
+        for (var i = 0; i < byteArraySize; i++) {
+            bytes[i] = HEAPU8[byteArray + i];
+        }
+
+        var downloader = window.document.createElement('a');
+        downloader.setAttribute('id', gameObjectName);
+        downloader.href = window.URL.createObjectURL(new Blob([bytes], { type: 'application/octet-stream' }));
+        downloader.download = filename;
+        document.body.appendChild(downloader);
+
+        document.onmouseup = function() {
+            downloader.click();
+            document.body.removeChild(downloader);
+        	document.onmouseup = null;
+
+            SendMessage(gameObjectName, methodName);
+        }
+    }
+};
+
+mergeInto(LibraryManager.library, StandaloneFileBrowserWebGLPlugin);