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_STORE_DELEGATE_H_ 6 #define WIN8_METRO_DRIVER_IME_TEXT_STORE_DELEGATE_H_ 7 8 #include <vector> 9 10 #include <windows.h> 11 12 #include "base/basictypes.h" 13 #include "base/strings/string16.h" 14 15 namespace metro_viewer { 16 struct UnderlineInfo; 17 } 18 19 namespace metro_driver { 20 21 // A delegate which works together with virtual text stores. 22 // Objects that implement this delegate will receive notifications from a 23 // virtual text store whenever an IME updates the composition or commits text. 24 // Objects that implement this delegate are also responsible for calculating 25 // the character position of composition and caret position upon request. 26 class TextStoreDelegate { 27 public: 28 virtual ~TextStoreDelegate() {} 29 30 // Called when on-going composition is updated. An empty |text| represents 31 // that the composition is canceled. 32 virtual void OnCompositionChanged( 33 const base::string16& text, 34 int32 selection_start, 35 int32 selection_end, 36 const std::vector<metro_viewer::UnderlineInfo>& underlines) = 0; 37 38 // Called when |text| is committed. 39 virtual void OnTextCommitted(const base::string16& text) = 0; 40 41 // Called when an IME requests the caret position. Objects that implement 42 // this method must return the caret position in screen coordinates. 43 virtual RECT GetCaretBounds() = 0; 44 45 // Called when an IME requests the bounding box of an character whose 46 // index is |index| in the on-going composition. position. Objects that 47 // implement this method must return true and fill the character bounds into 48 // |rect| in screen coordinates. 49 // Should return false if |index| is invalid. 50 virtual bool GetCompositionCharacterBounds(uint32 index, RECT* rect) = 0; 51 }; 52 53 } // namespace metro_driver 54 55 #endif // WIN8_METRO_DRIVER_IME_TEXT_STORE_DELEGATE_H_ 56
