chrome/browser/ui/search/search_model.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_MODEL_H_
   6 #define CHROME_BROWSER_UI_SEARCH_SEARCH_MODEL_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/observer_list.h"
  10 #include "chrome/common/search_types.h"
  11
  12 class SearchModelObserver;
  13
  14 // Represents whether a page supports Instant.
  15 enum InstantSupportState {
  16   INSTANT_SUPPORT_NO,
  17   INSTANT_SUPPORT_YES,
  18   INSTANT_SUPPORT_UNKNOWN,
  19 };
  20
  21 // An observable model for UI components that care about search model state
  22 // changes.
  23 class SearchModel {
  24  public:
  25   struct State {
  26     State();
  27     State(const SearchMode& mode,
  28           InstantSupportState instant_support,
  29           bool voice_search_supported);
  30
  31     bool operator==(const State& rhs) const;
  32
  33     // The display mode of UI elements such as the toolbar, the tab strip, etc.
  34     SearchMode mode;
  35
  36     // Does the current page support Instant?
  37     InstantSupportState instant_support;
  38
  39     // Does the current page support voice search?
  40     bool voice_search_supported;
  41   };
  42
  43   SearchModel();
  44   ~SearchModel();
  45
  46   // Change the state.  Change notifications are sent to observers.
  47   void SetState(const State& state);
  48
  49   // Get the current state.
  50   const State& state() const { return state_; }
  51
  52   // Change the mode.  Change notifications are sent to observers.
  53   void SetMode(const SearchMode& mode);
  54
  55   // Get the active mode.
  56   const SearchMode& mode() const { return state_.mode; }
  57
  58   // Sets the page instant support state. Change notifications are sent to
  59   // observers.
  60   void SetInstantSupportState(InstantSupportState instant_support);
  61
  62   // Gets the instant support state of the page.
  63   InstantSupportState instant_support() const {
  64     return state_.instant_support;
  65   }
  66
  67   // Sets the page voice search support state.  Change notifications are sent to
  68   // observers.
  69   void SetVoiceSearchSupported(bool supported);
  70
  71   // Gets the voice search support state of the page.
  72   bool voice_search_supported() const { return state_.voice_search_supported; }
  73
  74   // Add and remove observers.
  75   void AddObserver(SearchModelObserver* observer);
  76   void RemoveObserver(SearchModelObserver* observer);
  77
  78  private:
  79   // Current state of model.
  80   State state_;
  81
  82   // Observers.
  83   base::ObserverList<SearchModelObserver> observers_;
  84
  85   DISALLOW_COPY_AND_ASSIGN(SearchModel);
  86 };
  87
  88 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_MODEL_H_