ui/app_list/search_provider.h

   1 // Copyright 2014 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 UI_APP_LIST_SEARCH_PROVIDER_H_
   6 #define UI_APP_LIST_SEARCH_PROVIDER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/scoped_vector.h"
  12 #include "base/strings/string16.h"
  13 #include "ui/app_list/app_list_export.h"
  14
  15 namespace app_list {
  16
  17 class SearchResult;
  18
  19 class APP_LIST_EXPORT SearchProvider {
  20  public:
  21   typedef ScopedVector<SearchResult> Results;
  22   typedef base::Closure ResultChangedCallback;
  23
  24   SearchProvider();
  25   virtual ~SearchProvider();
  26
  27   // Invoked to start a query.
  28   virtual void Start(const base::string16& query) = 0;
  29
  30   // Invoked to stop the current query and no more results changes.
  31   virtual void Stop() = 0;
  32
  33   void set_result_changed_callback(const ResultChangedCallback& callback) {
  34     result_changed_callback_ = callback;
  35   }
  36
  37   const Results& results() const { return results_; }
  38
  39  protected:
  40   // Interface for the derived class to generate search results.
  41   void Add(scoped_ptr<SearchResult> result);
  42   void ClearResults();
  43
  44  private:
  45   void FireResultChanged();
  46
  47   ResultChangedCallback result_changed_callback_;
  48   Results results_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
  51 };
  52
  53 }  // namespace app_list
  54
  55 #endif  // UI_APP_LIST_SEARCH_PROVIDER_H_