1// Copyright (c) 2012 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 CHROME_BROWSER_UI_SEARCH_SEARCH_DELEGATE_H_
6#define CHROME_BROWSER_UI_SEARCH_SEARCH_DELEGATE_H_
7
8#include "base/basictypes.h"
9#include "base/compiler_specific.h"
10#include "chrome/browser/ui/search/search_model_observer.h"
11
12namespace content {
13class WebContents;
14}
15
16class SearchModel;
17
18// The SearchDelegate class acts as a helper to the Browser class.
19// It is responsible for routing the changes from the active tab's
20// SearchModel through to the toolbar, tabstrip and other UI
21// observers.
22// Changes are propagated from the active tab's model via this class to the
23// Browser-level model.
24class SearchDelegate : public SearchModelObserver {
25 public:
26  explicit SearchDelegate(SearchModel* browser_search_model);
27  virtual ~SearchDelegate();
28
29  // Overrides for SearchModelObserver:
30  virtual void ModelChanged(const SearchModel::State& old_state,
31                            const SearchModel::State& new_state) OVERRIDE;
32
33  // When the active tab is changed, the model state of this new active tab is
34  // propagated to the browser.
35  void OnTabActivated(content::WebContents* web_contents);
36
37  // When a tab is deactivated, this class no longer observes changes to the
38  // tab's model.
39  void OnTabDeactivated(content::WebContents* web_contents);
40
41  // When a tab is detached, this class no longer observes changes to the
42  // tab's model.
43  void OnTabDetached(content::WebContents* web_contents);
44
45 private:
46  // Stop observing tab.
47  void StopObservingTab(content::WebContents* web_contents);
48
49  // Weak.  The Browser class owns this.  The active |tab_model_| state is
50  // propagated to the |browser_model_|.
51  SearchModel* browser_model_;
52
53  // Weak.  The WebContents owns this.  It is the model of the active
54  // tab.  Changes to this model are propagated through to the |browser_model_|.
55  SearchModel* tab_model_;
56
57  DISALLOW_COPY_AND_ASSIGN(SearchDelegate);
58};
59
60#endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_DELEGATE_H_
61