Home | History | Annotate | Download | only in search 
      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 
     12 namespace content {
     13 class WebContents;
     14 }
     15 
     16 class 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.
     24 class 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