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// 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.
#ifndef CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
#define CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "ipc/ipc_listener.h"
#include "ipc/ipc_sender.h"
class GURL;
namespace blink {
class WebGestureEvent;
class WebLocalFrame;
struct WebURLError;
}
namespace content {
class RenderView;
class RenderViewImpl;
// Base class for objects that want to filter incoming IPCs, and also get
// notified of changes to the frame.
class CONTENT_EXPORT RenderViewObserver : public IPC::Listener,
public IPC::Sender {
public:
// A subclass can use this to delete itself. If it does not, the subclass must
// always null-check each call to render_view() becase the RenderView can
// go away at any time.
virtual void OnDestruct() = 0;
// These match the WebKit API notifications
virtual void DidStartLoading() {}
virtual void DidStopLoading() {}
virtual void DidFailProvisionalLoad(blink::WebLocalFrame* frame,
const blink::WebURLError& error) {}
virtual void DidCommitProvisionalLoad(blink::WebLocalFrame* frame,
bool is_new_navigation) {}
virtual void DidClearWindowObject(blink::WebLocalFrame* frame) {}
virtual void DidCommitCompositorFrame() {}
virtual void DidUpdateLayout() {}
// These match the RenderView methods.
virtual void DidHandleGestureEvent(const blink::WebGestureEvent& event) {}
// These match incoming IPCs.
virtual void Navigate(const GURL& url) {}
virtual void OnZoomLevelChanged() {}
// IPC::Listener implementation.
bool OnMessageReceived(const IPC::Message& message) override;
// IPC::Sender implementation.
bool Send(IPC::Message* message) override;
RenderView* render_view() const;
int routing_id() const { return routing_id_; }
protected:
explicit RenderViewObserver(RenderView* render_view);
~RenderViewObserver() override;
// Sets |render_view_| to track.
// Removes itself of previous (if any) |render_view_| observer list and adds
// to the new |render_view|. Since it assumes that observer outlives
// render_view, OnDestruct should be overridden.
void Observe(RenderView* render_view);
private:
friend class RenderViewImpl;
// This is called by the RenderView when it's going away so that this object
// can null out its pointer.
void RenderViewGone();
RenderViewImpl* render_view_;
// The routing ID of the associated RenderView.
int routing_id_;
DISALLOW_COPY_AND_ASSIGN(RenderViewObserver);
};
} // namespace content
#endif // CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_