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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_H_ | |
6 #define IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_H_ | |
7 | |
8 #include <memory> | |
9 #include <vector> | |
10 | |
11 #include "base/macros.h" | |
12 #include "base/observer_list.h" | |
13 | |
14 class WebStateListObserver; | |
15 | |
16 namespace web { | |
17 class WebState; | |
18 } | |
19 | |
20 // Manages a list of WebStates. May owns the WebState depending on the ownership | |
21 // setting (initialised during construction, should eventually always be "owned" | |
22 // once ownership of Tab is sane, see http://crbug.com/546222 for progress). | |
23 class WebStateList { | |
24 public: | |
25 enum WebStateOwnership { | |
26 WebStateBorrowed, | |
27 WebStateOwned, | |
28 }; | |
29 | |
30 explicit WebStateList(WebStateOwnership ownership = WebStateBorrowed); | |
31 ~WebStateList(); | |
32 | |
33 // Returns whether the model is empty or not. | |
34 bool empty() const { return web_state_wrappers_.empty(); } | |
35 | |
36 // Returns the number of WebStates in the model. | |
37 size_t count() const { return web_state_wrappers_.size(); } | |
38 | |
39 // Returns true if the specified index is contained by the model. | |
40 bool ContainsIndex(size_t index) const; | |
41 | |
42 // Returns the WebState at the specified index. It is invalid to call this | |
43 // with an index such that |ContainsIndex(index)| returns false. | |
44 web::WebState* GetWebStateAt(size_t index) const; | |
45 | |
46 // Returns the index of the specified WebState or kInvalidIndex if the | |
47 // WebState is not in the model. | |
48 size_t GetIndexOfWebState(const web::WebState* web_state) const; | |
49 | |
50 // Inserts the specified WebState at the specified index. | |
51 void InsertWebState(size_t index, web::WebState* web_state); | |
52 | |
53 // Moves the WebState at the specified index to another index. | |
54 void MoveWebStateAt(size_t from_index, size_t to_index); | |
55 | |
56 // Replaces the WebState at the specified index with new WebState. Returns | |
57 // the old WebState at that index to the caller (abandon ownership of the | |
58 // returned WebState). | |
59 web::WebState* ReplaceWebStateAt(size_t index, web::WebState* web_state); | |
60 | |
61 // Detachs the WebState at the specified index. | |
rohitrao (ping after 24h)
2017/02/14 13:49:31
Detaches.
sdefresne
2017/02/14 15:26:35
Done.
| |
62 void DetachWebStateAt(size_t index); | |
63 | |
64 // Adds an observer to the model. | |
65 void AddObserver(WebStateListObserver* observer); | |
66 | |
67 // Removes an observer from the model. | |
68 void RemoveObserver(WebStateListObserver* observer); | |
69 | |
70 // Invalid index. | |
71 static const size_t kInvalidIndex = static_cast<size_t>(-1); | |
72 | |
73 private: | |
74 class WebStateWrapper; | |
75 const WebStateOwnership web_state_ownership_; | |
76 std::vector<std::unique_ptr<WebStateWrapper>> web_state_wrappers_; | |
77 | |
78 // List of observers notified of changes to the model. | |
79 base::ObserverList<WebStateListObserver, true> observers_; | |
80 | |
81 DISALLOW_COPY_AND_ASSIGN(WebStateList); | |
82 }; | |
83 | |
84 #endif // IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_H_ | |
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