Provide an override for Webview drop effect....

webkit/glue/webview_impl.h

 // 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.
 
 #ifndef WEBKIT_GLUE_WEBVIEW_IMPL_H_
 #define WEBKIT_GLUE_WEBVIEW_IMPL_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 97 matching lines @@
       const WebKit::WebPoint& client_point,
       const WebKit::WebPoint& screen_point);
   virtual bool DragTargetDragOver(
       const WebKit::WebPoint& client_point,
       const WebKit::WebPoint& screen_point);
   virtual void DragTargetDragLeave();
   virtual void DragTargetDrop(
       const WebKit::WebPoint& client_point,
       const WebKit::WebPoint& screen_point);
   virtual int32 GetDragIdentity();
+  virtual bool SetDropEffect(bool accept);
   virtual void AutofillSuggestionsForNode(
       int64 node_id,
       const std::vector<std::wstring>& suggestions,
       int default_suggestion_index);
   virtual void HideAutofillPopup();
 
   virtual WebDevToolsAgent* GetWebDevToolsAgent();
   WebDevToolsAgentImpl* GetWebDevToolsAgentImpl();
 
   // WebViewImpl
@@ skipping 189 matching lines @@
   bool ime_accept_events_;
 
   // True while dispatching system drag and drop events to drag/drop targets
   // within this WebView.
   bool drag_target_dispatch_;
 
   // Valid when drag_target_dispatch_ is true; the identity of the drag data
   // copied from the WebDropData object sent from the browser process.
   int32 drag_identity_;
 
+  // Valid when drag_target_dispatch_ is true.  Used to override the default
+  // browser drop effect with the effects "copy" or "none".
+  enum DragTargetDropEffect {
+    DROP_EFFECT_DEFAULT = 0, DROP_EFFECT_COPY, DROP_EFFECT_NONE

[tony, 2009/04/21 18:26:28]

Nit: one value per line (that's what we do everywhere else we have an enum).

+  } drop_effect_;
+
+  // When true, the drag data can be dropped onto the current drop target in
+  // this WebView (the drop target can accept the drop).
+  bool drop_accept_;
+
   // The autocomplete popup.  Kept around and reused every-time new suggestions
   // should be shown.
   RefPtr<WebCore::PopupContainer> autocomplete_popup_;
 
   // Whether the autocomplete popup is currently showing.
   bool autocomplete_popup_showing_;
 
   // The autocomplete client.
   scoped_ptr<AutocompletePopupMenuClient> autocomplete_popup_client_;
 
   scoped_ptr<WebDevToolsAgentImpl> devtools_agent_;
 
   // HACK: current_input_event is for ChromeClientImpl::show(), until we can fix
   // WebKit to pass enough information up into ChromeClient::show() so we can
   // decide if the window.open event was caused by a middle-mouse click
 public:
   static const WebKit::WebInputEvent* current_input_event() {
     return g_current_input_event;
   }
 private:
   static const WebKit::WebInputEvent* g_current_input_event;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewImpl);
 };
 
 #endif  // WEBKIT_GLUE_WEBVIEW_IMPL_H_