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      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 // KeywordExtensionsDelegate contains the extensions-only logic used by
      6 // KeywordProvider.
      7 // This file contains the dummy implementation of KeywordExtensionsDelegate,
      8 // which does nothing.
      9 
     10 #ifndef COMPONENTS_OMNIBOX_KEYWORD_EXTENSIONS_DELEGATE_H_
     11 #define COMPONENTS_OMNIBOX_KEYWORD_EXTENSIONS_DELEGATE_H_
     12 
     13 #include <string>
     14 
     15 #include "base/basictypes.h"
     16 #include "base/macros.h"
     17 #include "base/strings/string16.h"
     18 
     19 class AutocompleteInput;
     20 class KeywordProvider;
     21 class TemplateURL;
     22 
     23 class KeywordExtensionsDelegate {
     24  public:
     25   explicit KeywordExtensionsDelegate(KeywordProvider* provider);
     26   virtual ~KeywordExtensionsDelegate();
     27 
     28   // Increments the input ID used to identify if the suggest results from an
     29   // extension are current.
     30   virtual void IncrementInputId();
     31 
     32   // Returns true if an extension is enabled.
     33   virtual bool IsEnabledExtension(const std::string& extension_id);
     34 
     35   // Handles the extensions portion of KeywordProvider::Start().
     36   // Depending on |minimal_changes| and whether |input| wants matches
     37   // synchronous or not, either updates the KeywordProvider's matches with
     38   // the existing suggestions or asks the |template_url|'s extension to provide
     39   // matches.
     40   // Returns true if this delegate should stay in extension keyword mode.
     41   virtual bool Start(const AutocompleteInput& input,
     42                      bool minimal_changes,
     43                      const TemplateURL* template_url,
     44                      const base::string16& remaining_input);
     45 
     46   // Tells the extension with |extension_id| that the user typed the omnibox
     47   // keyword.
     48   virtual void EnterExtensionKeywordMode(const std::string& extension_id);
     49 
     50   // If an extension previously entered extension keyword mode, exits extension
     51   // keyword mode. This happens when the user has cleared the keyword or closed
     52   // the omnibox popup.
     53   virtual void MaybeEndExtensionKeywordMode();
     54 
     55  private:
     56   DISALLOW_COPY_AND_ASSIGN(KeywordExtensionsDelegate);
     57 };
     58 
     59 #endif  // COMPONENTS_OMNIBOX_KEYWORD_EXTENSIONS_DELEGATE_H_
     60