Paste (#1231)

* update fixBrowserBehavior.ts: Get base64 content of a file ont PASTE event via FileReader. Not reflected into EDITOR yet.

* update fixBrowserBehavior.ts: Get base64 content of a file ont PASTE event via FileReader. And reflect it in the EDITOR and HTML PREVIWER.

* update fixBrowserBehavior.ts:  Add target file name as TITTLE of IMAGE.

Co-authored-by: ConanJordan <1042583309@qq.com>

src/ts/util/fixBrowserBehavior.ts

@@ -1260,6 +1260,7 @@ export const paste = async (vditor: IVditor, event: (ClipboardEvent | DragEvent)
   let textHTML;
   let textPlain;
   let files;
+
   if ("clipboardData" in event) {
     textHTML = event.clipboardData.getData("text/html");
     textPlain = event.clipboardData.getData("text/plain");
@@ -1415,6 +1416,28 @@ export const paste = async (vditor: IVditor, event: (ClipboardEvent | DragEvent)
       vditor.outline.render(vditor);
     } else if (files.length > 0 && (vditor.options.upload.url || vditor.options.upload.handler)) {
       await uploadFiles(vditor, files);
+    } else if (files.length > 0 && (!vditor.options.upload.url || !vditor.options.upload.handler)) {
+      var fileReader = new FileReader();
+      var file: File;
+      if ("clipboardData" in event) {
+        files = event.clipboardData.files;
+        file = files[0];
+      } else {
+        if (event.dataTransfer.types.includes("Files")) {
+          files = event.dataTransfer.items;
+          file = files[0].getAsFile();
+        }
+      }
+      fileReader.readAsDataURL(file);
+      fileReader.onload = function() {
+        // Get the base64 format content of target file.
+        var result = fileReader.result;
+        //console.log("This is an image.", result);
+        // Image in Markdown:![title or file name](dataurl)
+        // Put it in a newline.
+        var png = "\r![" + file.name + "](" + result.toString() + ")\r";
+        insertHTML(vditor.lute.Md2VditorIRDOM(png), vditor);
+      }
     } else if (textPlain.trim() !== "" && files.length === 0) {
       if (vditor.currentMode === "ir") {
         renderers.Md2VditorIRDOM = {renderLinkDest};