Extract minimal RenderViewHost interface for embedders, leaving

content/browser/tab_contents/web_drag_dest_gtk.cc

 // Copyright (c) 2012 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 "content/browser/tab_contents/web_drag_dest_gtk.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 50 matching lines @@
 
 void WebDragDestGtk::UpdateDragStatus(WebDragOperation operation) {
   if (context_) {
     is_drop_target_ = operation != WebDragOperationNone;
     gdk_drag_status(context_, content::WebDragOpToGdkDragAction(operation),
                     drag_over_time_);
   }
 }
 
 void WebDragDestGtk::DragLeave() {
-  web_contents_->GetRenderViewHost()->DragTargetDragLeave();
+  GetRenderViewHost()->DragTargetDragLeave();
 
   if (delegate())
     delegate()->OnDragLeave();
 }
 
 gboolean WebDragDestGtk::OnDragMotion(GtkWidget* sender,
                                       GdkDragContext* context,
                                       gint x, gint y,
                                       guint time) {
   if (context_ != context) {
@@ skipping 26 matching lines @@
       gtk_drag_get_data(widget_, context,
                         ui::GetAtomForTarget(supported_targets[i]),
                         time);
     }
 
     if (delegate()) {
       gtk_drag_get_data(widget_, context, delegate()->GetBookmarkTargetAtom(),
                         time);
     }
   } else if (data_requests_ == 0) {
-    web_contents_->GetRenderViewHost()->
-        DragTargetDragOver(
-            ui::ClientPoint(widget_),
-            ui::ScreenPoint(widget_),
-            content::GdkDragActionToWebDragOp(context->actions));
+    GetRenderViewHost()->DragTargetDragOver(
+        ui::ClientPoint(widget_),
+        ui::ScreenPoint(widget_),
+        content::GdkDragActionToWebDragOp(context->actions));
 
     if (delegate())
       delegate()->OnDragOver();
 
     drag_over_time_ = time;
   }
 
   // Pretend we are a drag destination because we don't want to wait for
   // the renderer to tell us if we really are or not.
   return TRUE;
@@ skipping 81 matching lines @@
       delegate()->OnReceiveDataFromGtk(data);
     } else {
       delegate()->OnReceiveProcessedData(drop_data_->url,
                                          drop_data_->url_title);
     }
   }
 
   if (data_requests_ == 0) {
     // Tell the renderer about the drag.
     // |x| and |y| are seemingly arbitrary at this point.
-    web_contents_->GetRenderViewHost()->
-        DragTargetDragEnter(*drop_data_.get(),
-            ui::ClientPoint(widget_),
-            ui::ScreenPoint(widget_),
-            content::GdkDragActionToWebDragOp(context->actions));
+    GetRenderViewHost()->DragTargetDragEnter(
+        *drop_data_.get(),
+        ui::ClientPoint(widget_),
+        ui::ScreenPoint(widget_),
+        content::GdkDragActionToWebDragOp(context->actions));
 
     if (delegate())
       delegate()->OnDragEnter();
 
     drag_over_time_ = time;
   }
 }
 
 // The drag has left our widget; forward this information to the renderer.
 void WebDragDestGtk::OnDragLeave(GtkWidget* sender, GdkDragContext* context,
                                  guint time) {
   // Set |context_| to NULL to make sure we will recognize the next DragMotion
   // as an enter.
   context_ = NULL;
   drop_data_.reset();
   // When GTK sends us a drag-drop signal, it is shortly (and synchronously)
   // preceded by a drag-leave. The renderer doesn't like getting the signals
   // in this order so delay telling it about the drag-leave till we are sure
   // we are not getting a drop as well.
   MessageLoop::current()->PostTask(FROM_HERE,
       base::Bind(&WebDragDestGtk::DragLeave, method_factory_.GetWeakPtr()));
 }
 
 // Called by GTK when the user releases the mouse, executing a drop.
 gboolean WebDragDestGtk::OnDragDrop(GtkWidget* sender, GdkDragContext* context,
                                     gint x, gint y, guint time) {
   // Cancel that drag leave!
   method_factory_.InvalidateWeakPtrs();
 
-  web_contents_->GetRenderViewHost()->
+  GetRenderViewHost()->
       DragTargetDrop(ui::ClientPoint(widget_), ui::ScreenPoint(widget_));
 
   if (delegate())
     delegate()->OnDrop();
 
   // The second parameter is just an educated guess as to whether or not the
   // drag succeeded, but at least we will get the drag-end animation right
   // sometimes.
   gtk_drag_finish(context, is_drop_target_, FALSE, time);
 
   return TRUE;
 }
 
+RenderViewHostImpl* WebDragDestGtk::GetRenderViewHost() const {
+  return static_cast<RenderViewHostImpl*>(web_contents_->GetRenderViewHost());
+}
+
 }  // namespace content