Generate a file name when dragging an image to the desktop

chrome/browser/tab_contents/web_contents_view_win.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/tab_contents/web_contents_view_win.h"
 
 #include <windows.h>
 
 #include "chrome/browser/bookmarks/bookmark_drag_data.h"
 #include "chrome/browser/browser.h" // TODO(beng): this dependency is awful.
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_request_manager.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_win.h"
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 #include "chrome/browser/tab_contents/render_view_context_menu_controller.h"
 #include "chrome/browser/tab_contents/interstitial_page.h"
 #include "chrome/browser/tab_contents/tab_contents_delegate.h"
 #include "chrome/browser/tab_contents/web_contents.h"
 #include "chrome/browser/tab_contents/web_drag_source.h"
 #include "chrome/browser/tab_contents/web_drop_target.h"
 #include "chrome/browser/views/find_bar_win.h"
 #include "chrome/browser/views/sad_tab_view.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/os_exchange_data.h"
+#include "net/base/net_util.h"
 #include "webkit/glue/plugins/webplugin_delegate_impl.h"
 
 namespace {
 
 // Windows callback for OnDestroy to detach the plugin windows.
 BOOL CALLBACK DetachPluginWindowsCallback(HWND window, LPARAM param) {
   if (WebPluginDelegateImpl::IsPluginDelegateWindow(window)) {
     ::ShowWindow(window, SW_HIDE);
     SetParent(window, NULL);
   }
@@ skipping 52 matching lines @@
 
 void WebContentsViewWin::StartDragging(const WebDropData& drop_data) {
   scoped_refptr<OSExchangeData> data(new OSExchangeData);
 
   // TODO(tc): Generate an appropriate drag image.
 
   // We set the file contents before the URL because the URL also sets file
   // contents (to a .URL shortcut).  We want to prefer file content data over a
   // shortcut so we add it first.
   if (!drop_data.file_contents.empty()) {
-    data->SetFileContents(drop_data.file_description_filename,
-                          drop_data.file_contents);
+    // Images without ALT text will only have a file extension so we need to
+    // synthesize one from the provided extension and URL.
+    FilePath file_name(drop_data.file_description_filename);
+    file_name = file_name.BaseName().RemoveExtension();
+    if (file_name.value().empty()) {
+      // Retrieve the name from the URL.
+      file_name = FilePath::FromWStringHack(
+          net::GetSuggestedFilename(drop_data.url, L"", L""));
+    }
+    file_name = file_name.ReplaceExtension(drop_data.file_extension);
+    data->SetFileContents(file_name.value(), drop_data.file_contents);
   }
   if (!drop_data.text_html.empty())
     data->SetHtml(drop_data.text_html, drop_data.html_base_url);
   if (drop_data.url.is_valid()) {
     if (drop_data.url.SchemeIs("javascript")) {
       // We don't want to allow javascript URLs to be dragged to the desktop,
       // but we do want to allow them to be added to the bookmarks bar
       // (bookmarklets).
       BookmarkDragData::Element bm_elt;
       bm_elt.is_url = true;
@@ skipping 540 matching lines @@
   }
   return false;
 }
 
 void WebContentsViewWin::WheelZoom(int distance) {
   if (web_contents_->delegate()) {
     bool zoom_in = distance > 0;
     web_contents_->delegate()->ContentsZoomChange(zoom_in);
   }
 }