content: Split web_drag_dest_gtk.cc into chrome/ and content/ parts.

chrome/browser/tab_contents/web_drag_dest_gtk.h

 // Copyright (c) 2011 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 CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 #define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/task.h"
-#include "chrome/browser/bookmarks/bookmark_node_data.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "webkit/glue/webdropdata.h"
 
 class TabContents;
-class TabContentsWrapper;
+
+// An optional delegate that listens for drags of bookmark data.
+class WebDragBookmarkDelegate {

[jam, 2011/10/11 01:42:21]

nit: this should be in its own file since current convention is to put each
class/enum etc in a separate file.

+ public:
+  // Announces that a drag has started. It's valid that a drag starts, along
+  // with over/enter/leave/drop notifications without receiving any bookmark
+  // data.
+  virtual void DragInitialize(TabContents* contents) = 0;
+
+  // Called when WebDragDestkGtk detects that there's bookmark data in a
+  // drag. Not every drag will trigger these.
+  virtual void OnReceiveDataFromGtk(GtkSelectionData* data) = 0;
+  virtual void OnReceiveProcessedData(const GURL& url,
+                                      const string16& title) = 0;
+
+  // Notifications of drag progression.
+  virtual void OnDragOver() = 0;
+  virtual void OnDragEnter() = 0;
+  virtual void OnDrop() = 0;
+
+  // This should also clear any state kept about this drag.
+  virtual void OnDragLeave() = 0;
+
+  virtual ~WebDragBookmarkDelegate() {}
+};
 
 // A helper class that handles DnD for drops in the renderer. In GTK parlance,
 // this handles destination-side DnD, but not source-side DnD.
 class WebDragDestGtk {
  public:
   WebDragDestGtk(TabContents* tab_contents, GtkWidget* widget);
   virtual ~WebDragDestGtk();
 
   // This is called when the renderer responds to a drag motion event. We must
   // update the system drag cursor.
   void UpdateDragStatus(WebKit::WebDragOperation operation);
 
   // Informs the renderer when a system drag has left the render view.
   // See OnDragLeave().
   void DragLeave();
 
+  WebDragBookmarkDelegate* delegate() const { return delegate_; }
+  void set_delegate(WebDragBookmarkDelegate* delegate) { delegate_ = delegate; }
+
  private:
-  FRIEND_TEST_ALL_PREFIXES(WebDragDestGtkTest, NoTabContentsWrapper);
-
   // Called when a system drag crosses over the render view. As there is no drag
   // enter event, we treat it as an enter event (and not a regular motion event)
   // when |context_| is NULL.
   CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragMotion, GdkDragContext*,
                        gint, gint, guint);
 
   // We make a series of requests for the drag data when the drag first enters
   // the render view. This is the callback that is used to give us the data
   // for each individual target. When |data_requests_| reaches 0, we know we
   // have attained all the data, and we can finally tell the renderer about the
   // drag.
   CHROMEGTK_CALLBACK_6(WebDragDestGtk, void, OnDragDataReceived,
                        GdkDragContext*, gint, gint, GtkSelectionData*,
                        guint, guint);
 
   // The drag has left our widget; forward this information to the renderer.
   CHROMEGTK_CALLBACK_2(WebDragDestGtk, void, OnDragLeave, GdkDragContext*,
                        guint);
 
   // Called by GTK when the user releases the mouse, executing a drop.
   CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragDrop, GdkDragContext*,
                        gint, gint, guint);
 
   TabContents* tab_contents_;
 
-  // The TabContentsWrapper for |tab_contents_|.
-  // Weak reference; may be NULL if the contents aren't contained in a wrapper
-  // (e.g. WebUI dialogs).
-  TabContentsWrapper* tab_;
-
   // The render view.
   GtkWidget* widget_;
 
   // The current drag context for system drags over our render view, or NULL if
   // there is no system drag or the system drag is not over our render view.
   GdkDragContext* context_;
 
   // The data for the current drag, or NULL if |context_| is NULL.
   scoped_ptr<WebDropData> drop_data_;
 
   // The number of outstanding drag data requests we have sent to the drag
   // source.
   int data_requests_;
 
   // The last time we sent a message to the renderer related to a drag motion.
   gint drag_over_time_;
 
   // Whether the cursor is over a drop target, according to the last message we
   // got from the renderer.
   bool is_drop_target_;
 
   // Handler ID for the destroy signal handler. We connect to the destroy
   // signal handler so that we won't call dest_unset on it after it is
   // destroyed, but we have to cancel the handler if we are destroyed before
   // |widget_| is.
   int destroy_handler_;
 
-  // The bookmark data for the current tab. This will be empty if there is not
-  // a native bookmark drag (or we haven't gotten the data from the source yet).
-  BookmarkNodeData bookmark_drag_data_;
+  // A delegate that can receive drag information about drag events.
+  WebDragBookmarkDelegate* delegate_;
 
   ScopedRunnableMethodFactory<WebDragDestGtk> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_