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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 int count() const { return static_cast<int>(web_state_wrappers_.size()); } |
| 38 |
| 39 // Returns true if the specified index is contained by the model. |
| 40 bool ContainsIndex(int 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(int index) const; |
| 45 |
| 46 // Returns the index of the specified WebState or kInvalidIndex if the |
| 47 // WebState is not in the model. |
| 48 int GetIndexOfWebState(const web::WebState* web_state) const; |
| 49 |
| 50 // Inserts the specified WebState at the specified index. |
| 51 void InsertWebState(int index, web::WebState* web_state); |
| 52 |
| 53 // Moves the WebState at the specified index to another index. |
| 54 void MoveWebStateAt(int from_index, int 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(int index, web::WebState* web_state); |
| 60 |
| 61 // Detaches the WebState at the specified index. |
| 62 void DetachWebStateAt(int 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 int kInvalidIndex = -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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