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      1 // Copyright 2013 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 WIN8_METRO_DRIVER_IME_TEXT_SERVICE_DELEGATE_H_
      6 #define WIN8_METRO_DRIVER_IME_TEXT_SERVICE_DELEGATE_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/strings/string16.h"
     12 
     13 namespace metro_viewer {
     14 struct UnderlineInfo;
     15 }
     16 
     17 namespace metro_driver {
     18 
     19 // A delegate which works together with virtual text service.
     20 // Objects that implement this delegate will receive notifications from a
     21 // virtual text service whenever an IME updates the composition or commits text.
     22 class TextServiceDelegate {
     23  public:
     24   virtual ~TextServiceDelegate() {}
     25 
     26   // Called when on-going composition is updated. An empty |text| represents
     27   // that the composition is canceled.
     28   virtual void OnCompositionChanged(
     29       const string16& text,
     30       int32 selection_start,
     31       int32 selection_end,
     32       const std::vector<metro_viewer::UnderlineInfo>& underlines) = 0;
     33 
     34   // Called when |text| is committed.
     35   virtual void OnTextCommitted(const string16& text) = 0;
     36 };
     37 
     38 }  // namespace metro_driver
     39 
     40 #endif  // WIN8_METRO_DRIVER_IME_TEXT_SERVICE_DELEGATE_H_
     41