ui/base/ime/chromeos/ime_bridge.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_BASE_IME_CHROMEOS_IME_BRIDGE_H_
   6 #define UI_BASE_IME_CHROMEOS_IME_BRIDGE_H_
   7
   8 #include <string>
   9 #include <vector>
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/strings/string16.h"
  13 #include "ui/base/ime/text_input_mode.h"
  14 #include "ui/base/ime/text_input_type.h"
  15 #include "ui/base/ime/ui_base_ime_export.h"
  16
  17 namespace gfx {
  18 class Rect;
  19 }  // namespace gfx
  20
  21 namespace ui {
  22 class CandidateWindow;
  23 class KeyEvent;
  24 }  // namespace ui
  25
  26 namespace chromeos {
  27
  28 class CompositionText;
  29
  30 class UI_BASE_IME_EXPORT IMEInputContextHandlerInterface {
  31  public:
  32   // Called when the engine commit a text.
  33   virtual void CommitText(const std::string& text) = 0;
  34
  35   // Called when the engine updates composition text.
  36   virtual void UpdateCompositionText(const CompositionText& text,
  37                                      uint32 cursor_pos,
  38                                      bool visible) = 0;
  39
  40   // Called when the engine request deleting surrounding string.
  41   virtual void DeleteSurroundingText(int32 offset, uint32 length) = 0;
  42 };
  43
  44
  45 // A interface to handle the engine handler method call.
  46 class UI_BASE_IME_EXPORT IMEEngineHandlerInterface {
  47  public:
  48   typedef base::Callback<void (bool consumed)> KeyEventDoneCallback;
  49
  50   // A information about a focused text input field.
  51   // A type of each member is based on the html spec, but InputContext can be
  52   // used to specify about a non html text field like Omnibox.
  53   struct InputContext {
  54     InputContext(ui::TextInputType type_, ui::TextInputMode mode_, int flags_) :
  55       type(type_), mode(mode_), flags(flags_) {}
  56
  57     // An attribute of the field defined at
  58     // http://www.w3.org/TR/html401/interact/forms.html#input-control-types.
  59     ui::TextInputType type;
  60     // An attribute of the field defined at
  61     // http://www.whatwg.org/specs/web-apps/current-work/multipage/
  62     //  association-of-controls-and-forms.html#input-modalities
  63     //  :-the-inputmode-attribute.
  64     ui::TextInputMode mode;
  65     // An antribute to indicate the flags for web input fields. Please refer to
  66     // WebTextInputType.
  67     int flags;
  68   };
  69
  70   virtual ~IMEEngineHandlerInterface() {}
  71
  72   // Called when the Chrome input field get the focus.
  73   virtual void FocusIn(const InputContext& input_context) = 0;
  74
  75   // Called when the Chrome input field lose the focus.
  76   virtual void FocusOut() = 0;
  77
  78   // Called when the IME is enabled.
  79   virtual void Enable(const std::string& component_id) = 0;
  80
  81   // Called when the IME is disabled.
  82   virtual void Disable() = 0;
  83
  84   // Called when a property is activated or changed.
  85   virtual void PropertyActivate(const std::string& property_name) = 0;
  86
  87   // Called when the IME is reset.
  88   virtual void Reset() = 0;
  89
  90   // Called when the key event is received.
  91   // Actual implementation must call |callback| after key event handling.
  92   virtual void ProcessKeyEvent(const ui::KeyEvent& key_event,
  93                                const KeyEventDoneCallback& callback) = 0;
  94
  95   // Called when the candidate in lookup table is clicked. The |index| is 0
  96   // based candidate index in lookup table.
  97   virtual void CandidateClicked(uint32 index) = 0;
  98
  99   // Called when a new surrounding text is set. The |text| is surrounding text
 100   // and |cursor_pos| is 0 based index of cursor position in |text|. If there is
 101   // selection range, |anchor_pos| represents opposite index from |cursor_pos|.
 102   // Otherwise |anchor_pos| is equal to |cursor_pos|.
 103   virtual void SetSurroundingText(const std::string& text, uint32 cursor_pos,
 104                                   uint32 anchor_pos) = 0;
 105
 106   // Called when the composition bounds changed.
 107   virtual void SetCompositionBounds(const std::vector<gfx::Rect>& bounds) = 0;
 108
 109   // Returns whether the engine is interested in key events.
 110   // If not, InputMethodChromeOS won't feed it with key events.
 111   virtual bool IsInterestedInKeyEvent() const = 0;
 112
 113  protected:
 114   IMEEngineHandlerInterface() {}
 115 };
 116
 117 // A interface to handle the candidate window related method call.
 118 class UI_BASE_IME_EXPORT IMECandidateWindowHandlerInterface {
 119  public:
 120   virtual ~IMECandidateWindowHandlerInterface() {}
 121
 122   // Called when the IME updates the lookup table.
 123   virtual void UpdateLookupTable(const ui::CandidateWindow& candidate_window,
 124                                  bool visible) = 0;
 125
 126   // Called when the IME updates the preedit text. The |text| is given in
 127   // UTF-16 encoding.
 128   virtual void UpdatePreeditText(const base::string16& text,
 129                                  uint32 cursor_pos,
 130                                  bool visible) = 0;
 131
 132   // Called when the application changes its caret bounds.
 133   virtual void SetCursorBounds(const gfx::Rect& cursor_bounds,
 134                                const gfx::Rect& composition_head) = 0;
 135
 136   // Called when the text field's focus state is changed.
 137   // |is_focused| is true when the text field gains the focus.
 138   virtual void FocusStateChanged(bool is_focused) {}
 139
 140  protected:
 141   IMECandidateWindowHandlerInterface() {}
 142 };
 143
 144
 145 // IMEBridge provides access of each IME related handler. This class
 146 // is used for IME implementation.
 147 class UI_BASE_IME_EXPORT IMEBridge {
 148  public:
 149   virtual ~IMEBridge();
 150
 151   // Allocates the global instance. Must be called before any calls to Get().
 152   static void Initialize();
 153
 154   // Releases the global instance.
 155   static void Shutdown();
 156
 157   // Returns IMEBridge global instance. Initialize() must be called first.
 158   static IMEBridge* Get();
 159
 160   // Returns current InputContextHandler. This function returns NULL if input
 161   // context is not ready to use.
 162   virtual IMEInputContextHandlerInterface* GetInputContextHandler() const = 0;
 163
 164   // Updates current InputContextHandler. If there is no active input context,
 165   // pass NULL for |handler|. Caller must release |handler|.
 166   virtual void SetInputContextHandler(
 167       IMEInputContextHandlerInterface* handler) = 0;
 168
 169   // Updates current EngineHandler. If there is no active engine service, pass
 170   // NULL for |handler|. Caller must release |handler|.
 171   virtual void SetCurrentEngineHandler(IMEEngineHandlerInterface* handler) = 0;
 172
 173   // Returns current EngineHandler. This function returns NULL if current engine
 174   // is not ready to use.
 175   virtual IMEEngineHandlerInterface* GetCurrentEngineHandler() const = 0;
 176
 177   // Returns current CandidateWindowHandler. This function returns NULL if
 178   // current candidate window is not ready to use.
 179   virtual IMECandidateWindowHandlerInterface* GetCandidateWindowHandler()
 180       const = 0;
 181
 182   // Updates current CandidatWindowHandler. If there is no active candidate
 183   // window service, pass NULL for |handler|. Caller must release |handler|.
 184   virtual void SetCandidateWindowHandler(
 185       IMECandidateWindowHandlerInterface* handler) = 0;
 186
 187   // Updates the current input context.
 188   // This is called from InputMethodChromeOS.
 189   virtual void SetCurrentInputContext(
 190       const IMEEngineHandlerInterface::InputContext& input_context) = 0;
 191
 192   // Returns the current input context.
 193   // This is called from InputMethodEngine.
 194   virtual const IMEEngineHandlerInterface::InputContext&
 195   GetCurrentInputContext() const = 0;
 196
 197  protected:
 198   IMEBridge();
 199
 200  private:
 201   DISALLOW_COPY_AND_ASSIGN(IMEBridge);
 202 };
 203
 204 }  // namespace chromeos
 205
 206 #endif  // UI_BASE_IME_CHROMEOS_IME_BRIDGE_H_