chrome/browser/ui/search/search_delegate.h

   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   ~SearchDelegate() override;
  28
  29   // Overrides for SearchModelObserver:
  30   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_