blob: 48f28798a681766b2902babef2b4d3ebca877123 (
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
|
// Copyright (c) 2009 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_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
#define CHROME_BROWSER_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
#include <string>
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
#include "chrome/browser/history/history.h"
#include "chrome/common/notification_registrar.h"
class Profile;
class ThumbnailStore;
// ThumbnailSource is the gateway between network-level chrome:
// requests for thumbnails and the history backend that serves these.
class DOMUIThumbnailSource : public ChromeURLDataManager::DataSource,
public NotificationObserver {
public:
explicit DOMUIThumbnailSource(Profile* profile);
// Called when the network layer has requested a resource underneath
// the path we registered.
virtual void StartDataRequest(const std::string& path, int request_id);
virtual std::string GetMimeType(const std::string&) const {
// We need to explicitly return a mime type, otherwise if the user tries to
// drag the image they get no extension.
return "image/png";
}
// Called when thumbnail data is available from the history backend.
void OnThumbnailDataAvailable(HistoryService::Handle request_handle,
scoped_refptr<RefCountedBytes> data);
private:
// NotificationObserver implementation
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
// Fetch the specified resource.
void DoDataRequest(const std::string& path, int request_id);
Profile* profile_;
CancelableRequestConsumerT<int, 0> cancelable_consumer_;
// Raw PNG representation of the thumbnail to show when the thumbnail
// database doesn't have a thumbnail for a webpage.
scoped_refptr<RefCountedMemory> default_thumbnail_;
// Store requests when the ThumbnailStore isn't ready. When a notification is
// received that it is ready, then serve these requests.
std::vector<std::pair<std::string, int> > pending_requests_;
// To register to be notified when the ThumbnailStore is ready.
NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(DOMUIThumbnailSource);
};
#endif // CHROME_BROWSER_DOM_UI_DOM_UI_THUMBNAIL_SOURCE_H_
|
