blob: 4fcd0492c4e47d3f4b91d1bf992323338c2c06db (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// 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 "content/public/common/page_visibility_state.h"
#include "ipc/ipc_listener.h"
#include "ipc/ipc_sender.h"
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 DidCommitCompositorFrame() {}
virtual void DidUpdateMainFrameLayout() {}
virtual void OnZoomLevelChanged() {}
virtual void OnPageVisibilityChanged(PageVisibilityState visibility_state) {}
// 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_
|
