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
|
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_DOWNLOAD_DOWNLOAD_BUBBLE_INFO_H_
#define CHROME_BROWSER_UI_DOWNLOAD_DOWNLOAD_BUBBLE_INFO_H_
#include <functional>
#include <vector>
#include "base/observer_list.h"
#include "base/observer_list_types.h"
// Base class that handles observers for all the download bubble info classes.
// Info classes correspond to a particular view and hold the information
// necessary for that view to display itself. They are responsible for keeping
// that information up to date and notifying observers of changes.
template <typename ObserverType>
class DownloadBubbleInfo {
public:
using Observer = ObserverType;
DownloadBubbleInfo() = default;
~DownloadBubbleInfo() = default;
// This class is neither copyable nor movable due to the `ObserverList`
// member.
DownloadBubbleInfo(DownloadBubbleInfo&) = delete;
DownloadBubbleInfo& operator=(DownloadBubbleInfo&) = delete;
void AddObserver(Observer* observer) const {
observers_.AddObserver(observer);
}
void RemoveObserver(Observer* observer) const {
observers_.RemoveObserver(observer);
}
protected:
template <typename ObserverMethod, typename... Args>
void NotifyObservers(ObserverMethod&& method, Args&&... args) {
for (Observer& obs : observers_) {
std::invoke(method, obs, std::forward<Args>(args)...);
}
}
private:
mutable base::ObserverList<Observer> observers_;
};
// A simple observer for views that don't need any kind of incremental updating.
class DownloadBubbleInfoChangeObserver : public base::CheckedObserver {
public:
DownloadBubbleInfoChangeObserver();
~DownloadBubbleInfoChangeObserver() override;
virtual void OnInfoChanged() {}
};
#endif // CHROME_BROWSER_UI_DOWNLOAD_DOWNLOAD_BUBBLE_INFO_H_
|
