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// Copyright 2014 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 CONTENT_RENDERER_RENDER_FRAME_PROXY_H_
#define CONTENT_RENDERER_RENDER_FRAME_PROXY_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "ipc/ipc_listener.h"
#include "ipc/ipc_sender.h"
#include "third_party/WebKit/public/web/WebRemoteFrame.h"
#include "third_party/WebKit/public/web/WebRemoteFrameClient.h"
struct FrameMsg_BuffersSwapped_Params;
struct FrameMsg_CompositorFrameSwapped_Params;
namespace blink {
class WebInputEvent;
}
namespace content {
class ChildFrameCompositingHelper;
class RenderFrameImpl;
class RenderViewImpl;
// When a page's frames are rendered by multiple processes, each renderer has a
// full copy of the frame tree. It has full RenderFrames for the frames it is
// responsible for rendering and placeholder objects for frames rendered by
// other processes. This class is the renderer-side object for the placeholder.
// RenderFrameProxy allows us to keep existing window references valid over
// cross-process navigations and route cross-site asynchronous JavaScript calls,
// such as postMessage.
//
// For now, RenderFrameProxy is created when RenderFrame is swapped out. It
// acts as a wrapper and is used for sending and receiving IPC messages. It is
// deleted when the RenderFrame is swapped back in or the node of the frame
// tree is deleted.
//
// Long term, RenderFrameProxy will be created to replace the RenderFrame in the
// frame tree and the RenderFrame will be deleted after its unload handler has
// finished executing. It will still be responsible for routing IPC messages
// which are valid for cross-site interactions between frames.
// RenderFrameProxy will be deleted when the node in the frame tree is deleted
// or when navigating the frame causes it to return to this process and a new
// RenderFrame is created for it.
class CONTENT_EXPORT RenderFrameProxy
: public IPC::Listener,
public IPC::Sender,
NON_EXPORTED_BASE(public blink::WebRemoteFrameClient) {
public:
// This method should be used to create a RenderFrameProxy, which will replace
// an existing RenderFrame during its cross-process navigation from the
// current process to a different one. |routing_id| will be ID of the newly
// created RenderFrameProxy. |frame_to_replace| is the frame that the new
// proxy will eventually swap places with.
static RenderFrameProxy* CreateProxyToReplaceFrame(
RenderFrameImpl* frame_to_replace,
int routing_id);
// This method should be used to create a RenderFrameProxy, when there isn't
// an existing RenderFrame. It should be called to construct a local
// representation of a RenderFrame that has been created in another process --
// for example, after a cross-process navigation or after the addition of a
// new frame local to some other process. |routing_id| will be the ID of the
// newly created RenderFrameProxy. |parent_routing_id| is the routing ID of
// the RenderFrameProxy to which the new frame is parented.
// |render_view_routing_id| identifies the RenderView to be associated with
// this frame.
//
// |parent_routing_id| always identifies a RenderFrameProxy (never a
// RenderFrame) because a new child of a local frame should always start out
// as a frame, not a proxy.
static RenderFrameProxy* CreateFrameProxy(int routing_id,
int parent_routing_id,
int render_view_routing_id);
// Returns the RenderFrameProxy for the given routing ID.
static RenderFrameProxy* FromRoutingID(int routing_id);
// Returns the RenderFrameProxy given a WebFrame.
static RenderFrameProxy* FromWebFrame(blink::WebFrame* web_frame);
~RenderFrameProxy() override;
// IPC::Sender
bool Send(IPC::Message* msg) override;
// Out-of-process child frames receive a signal from RenderWidgetCompositor
// when a compositor frame has committed.
void DidCommitCompositorFrame();
int routing_id() { return routing_id_; }
RenderViewImpl* render_view() { return render_view_; }
blink::WebRemoteFrame* web_frame() { return web_frame_; }
// blink::WebRemoteFrameClient implementation:
virtual void frameDetached();
virtual void postMessageEvent(
blink::WebLocalFrame* sourceFrame,
blink::WebRemoteFrame* targetFrame,
blink::WebSecurityOrigin target,
blink::WebDOMMessageEvent event);
virtual void initializeChildFrame(
const blink::WebRect& frame_rect,
float scale_factor);
virtual void navigate(const blink::WebURLRequest& request,
bool should_replace_current_entry);
virtual void forwardInputEvent(const blink::WebInputEvent* event);
private:
RenderFrameProxy(int routing_id, int frame_routing_id);
void Init(blink::WebRemoteFrame* frame, RenderViewImpl* render_view);
// IPC::Listener
bool OnMessageReceived(const IPC::Message& msg) override;
// IPC handlers
void OnDeleteProxy();
void OnChildFrameProcessGone();
void OnCompositorFrameSwapped(const IPC::Message& message);
void OnDisownOpener();
// The routing ID by which this RenderFrameProxy is known.
const int routing_id_;
// The routing ID of the local RenderFrame (if any) which this
// RenderFrameProxy is meant to replace in the frame tree.
const int frame_routing_id_;
// Stores the WebRemoteFrame we are associated with.
blink::WebRemoteFrame* web_frame_;
scoped_refptr<ChildFrameCompositingHelper> compositing_helper_;
RenderViewImpl* render_view_;
DISALLOW_COPY_AND_ASSIGN(RenderFrameProxy);
};
} // namespace
#endif // CONTENT_RENDERER_RENDER_FRAME_PROXY_H_