Plumb the DragOperation through all the layers between the platform DnD code ...

chrome/browser/tab_contents/web_drop_target.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 <windows.h>
 #include <shlobj.h>
 
 #include "chrome/browser/tab_contents/web_drop_target.h"
 
 #include "app/os_exchange_data.h"
 #include "app/os_exchange_data_provider_win.h"
 #include "base/clipboard_util.h"
 #include "base/gfx/point.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/net_util.h"
 #include "webkit/glue/webdropdata.h"
 #include "webkit/glue/window_open_disposition.h"
 
+using WebKit::WebDragOperationCopy;
+
 namespace {
 
 // A helper method for getting the preferred drop effect.
 DWORD GetPreferredDropEffect(DWORD effect) {
   if (effect & DROPEFFECT_COPY)
     return DROPEFFECT_COPY;
   if (effect & DROPEFFECT_LINK)
     return DROPEFFECT_LINK;
   if (effect & DROPEFFECT_MOVE)
     return DROPEFFECT_MOVE;
@@ skipping 75 matching lines @@
 
   if (drop_data.url.is_empty())
     OSExchangeDataProviderWin::GetPlainTextURL(data_object, &drop_data.url);
 
   is_drop_target_ = true;
 
   POINT client_pt = cursor_position;
   ScreenToClient(GetHWND(), &client_pt);
   tab_contents_->render_view_host()->DragTargetDragEnter(drop_data,
       gfx::Point(client_pt.x, client_pt.y),
-      gfx::Point(cursor_position.x, cursor_position.y));
+      gfx::Point(cursor_position.x, cursor_position.y),
+      WebDragOperationCopy);  // FIXME(snej): Send actual operation
 
   // We lie here and always return a DROPEFFECT because we don't want to
   // wait for the IPC call to return.
   return GetPreferredDropEffect(effect);
 }
 
 DWORD WebDropTarget::OnDragOver(IDataObject* data_object,
                                 DWORD key_state,
                                 POINT cursor_position,
                                 DWORD effect) {
   DCHECK(current_rvh_);
   if (current_rvh_ != tab_contents_->render_view_host())
     OnDragEnter(data_object, key_state, cursor_position, effect);
 
   if (tab_contents_->showing_interstitial_page())
     return interstitial_drop_target_->OnDragOver(data_object, effect);
 
   POINT client_pt = cursor_position;
   ScreenToClient(GetHWND(), &client_pt);
   tab_contents_->render_view_host()->DragTargetDragOver(
       gfx::Point(client_pt.x, client_pt.y),
-      gfx::Point(cursor_position.x, cursor_position.y));
+      gfx::Point(cursor_position.x, cursor_position.y),
+      WebDragOperationCopy);  // FIXME(snej): Send actual operation
 
   if (!is_drop_target_)
     return DROPEFFECT_NONE;
 
   return GetPreferredDropEffect(effect);
 }
 
 void WebDropTarget::OnDragLeave(IDataObject* data_object) {
   DCHECK(current_rvh_);
   if (current_rvh_ != tab_contents_->render_view_host())
@@ skipping 25 matching lines @@
   tab_contents_->render_view_host()->DragTargetDrop(
       gfx::Point(client_pt.x, client_pt.y),
       gfx::Point(cursor_position.x, cursor_position.y));
 
   current_rvh_ = NULL;
 
   // We lie and always claim that the drop operation didn't happen because we
   // don't want to wait for the renderer to respond.
   return DROPEFFECT_NONE;
 }