content: Move render_widget_host_view_gtk to content/

chrome/browser/renderer_host/gtk_im_context_wrapper.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
-#define CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
-#pragma once
-
-#include <gdk/gdk.h>
-#include <pango/pango-attributes.h>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/gtest_prod_util.h"
-#include "base/string16.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
-#include "ui/base/ime/composition_text.h"
-#include "ui/base/ime/text_input_type.h"
-
-namespace gfx {
-class Rect;
-}
-
-#if !defined(TOOLKIT_VIEWS)
-class MenuGtk;
-#endif
-class RenderWidgetHostViewGtk;
-struct NativeWebKeyboardEvent;
-typedef struct _GtkIMContext GtkIMContext;
-typedef struct _GtkWidget GtkWidget;
-
-// This class is a convenience wrapper for GtkIMContext.
-// It creates and manages two GtkIMContext instances, one is GtkIMMulticontext,
-// for plain text input box, another is GtkIMContextSimple, for password input
-// box.
-//
-// This class is in charge of dispatching key events to these two GtkIMContext
-// instances and handling signals emitted by them. Key events then will be
-// forwarded to renderer along with input method results via corresponding host
-// view.
-//
-// This class is used solely by RenderWidgetHostViewGtk.
-class GtkIMContextWrapper {
- public:
-  explicit GtkIMContextWrapper(RenderWidgetHostViewGtk* host_view);
-  ~GtkIMContextWrapper();
-
-  // Processes a gdk key event received by |host_view|.
-  void ProcessKeyEvent(GdkEventKey* event);
-
-  void UpdateInputMethodState(ui::TextInputType type,
-                              bool can_compose_inline,
-                              const gfx::Rect& caret_rect);
-  void OnFocusIn();
-  void OnFocusOut();
-  bool is_focused() const { return is_focused_; }
-
-#if !defined(TOOLKIT_VIEWS)
-  // Not defined for views because the views context menu doesn't
-  // implement input methods yet.
-  void AppendInputMethodsContextMenu(MenuGtk* menu);
-#endif
-
-  void CancelComposition();
-
-  void ConfirmComposition();
-
- private:
-  // Check if a text needs commit by forwarding a char event instead of
-  // by confirming as a composition text.
-  bool NeedCommitByForwardingCharEvent() const;
-
-  // Check if the input method returned any result, eg. preedit and commit text.
-  bool HasInputMethodResult() const;
-
-  void ProcessFilteredKeyPressEvent(NativeWebKeyboardEvent* wke);
-  void ProcessUnfilteredKeyPressEvent(NativeWebKeyboardEvent* wke);
-
-  // Processes result returned from input method after filtering a key event.
-  // |filtered| indicates if the key event was filtered by the input method.
-  void ProcessInputMethodResult(const GdkEventKey* event, bool filtered);
-
-  // Real code of "commit" signal handler.
-  void HandleCommit(const string16& text);
-
-  // Real code of "preedit-start" signal handler.
-  void HandlePreeditStart();
-
-  // Real code of "preedit-changed" signal handler.
-  void HandlePreeditChanged(const gchar* text,
-                            PangoAttrList* attrs,
-                            int cursor_position);
-
-  // Real code of "preedit-end" signal handler.
-  void HandlePreeditEnd();
-
-  // Real code of "realize" signal handler, used for setting im context's client
-  // window.
-  void HandleHostViewRealize(GtkWidget* widget);
-
-  // Real code of "unrealize" signal handler, used for unsetting im context's
-  // client window.
-  void HandleHostViewUnrealize();
-
-  // Sends a fake composition key event with specified event type. A composition
-  // key event is a key event with special key code 229.
-  void SendFakeCompositionKeyEvent(WebKit::WebInputEvent::Type type);
-
-  // Signal handlers of GtkIMContext object.
-  static void HandleCommitThunk(GtkIMContext* context, gchar* text,
-                                GtkIMContextWrapper* self);
-  static void HandlePreeditStartThunk(GtkIMContext* context,
-                                      GtkIMContextWrapper* self);
-  static void HandlePreeditChangedThunk(GtkIMContext* context,
-                                        GtkIMContextWrapper* self);
-  static void HandlePreeditEndThunk(GtkIMContext* context,
-                                    GtkIMContextWrapper* self);
-
-  // Signal handlers connecting to |host_view_|'s native view widget.
-  static void HandleHostViewRealizeThunk(GtkWidget* widget,
-                                         GtkIMContextWrapper* self);
-  static void HandleHostViewUnrealizeThunk(GtkWidget* widget,
-                                           GtkIMContextWrapper* self);
-
-  // The parent object.
-  RenderWidgetHostViewGtk* host_view_;
-
-  // The GtkIMContext object.
-  // In terms of the DOM event specification Appendix A
-  //   <http://www.w3.org/TR/DOM-Level-3-Events/keyset.html>,
-  // GTK uses a GtkIMContext object for the following two purposes:
-  //  1. Composing Latin characters (A.1.2), and;
-  //  2. Composing CJK characters with an IME (A.1.3).
-  // Many JavaScript pages assume composed Latin characters are dispatched to
-  // their onkeypress() handlers but not dispatched CJK characters composed
-  // with an IME. To emulate this behavior, we should monitor the status of
-  // this GtkIMContext object and prevent sending Char events when a
-  // GtkIMContext object sends a "commit" signal with the CJK characters
-  // composed by an IME.
-  GtkIMContext* context_;
-
-  // A GtkIMContextSimple object, for supporting dead/compose keys when input
-  // method is disabled, eg. in password input box.
-  GtkIMContext* context_simple_;
-
-  // Whether or not this widget is focused.
-  bool is_focused_;
-
-  // Whether or not the above GtkIMContext is composing a text with an IME.
-  // This flag is used in "commit" signal handler of the GtkIMContext object,
-  // which determines how to submit the result text to WebKit according to this
-  // flag.
-  // If this flag is true or there are more than one characters in the result,
-  // then the result text will be committed to WebKit as a confirmed
-  // composition. Otherwise, it'll be forwarded as a key event.
-  //
-  // The GtkIMContext object sends a "preedit_start" before it starts composing
-  // a text and a "preedit_end" signal after it finishes composing it.
-  // "preedit_start" signal is monitored to turn it on.
-  // We don't monitor "preedit_end" signal to turn it off, because an input
-  // method may fire "preedit_end" signal before "commit" signal.
-  // A buggy input method may not fire "preedit_start" and/or "preedit_end"
-  // at all, so this flag will also be set to true when "preedit_changed" signal
-  // is fired with non-empty preedit text.
-  bool is_composing_text_;
-
-  // Whether or not the IME is enabled.
-  bool is_enabled_;
-
-  // Whether or not it's currently running inside key event handler.
-  // If it's true, then preedit-changed and commit handler will backup the
-  // preedit or commit text instead of sending them down to webkit.
-  // key event handler will send them later.
-  bool is_in_key_event_handler_;
-
-  // The most recent composition text information retrieved from context_;
-  ui::CompositionText composition_;
-
-  // Whether or not the composition has been changed since last key event.
-  bool is_composition_changed_;
-
-  // Stores a copy of the most recent commit text received by commit signal
-  // handler.
-  string16 commit_text_;
-
-  // If it's true then the next "commit" signal will be suppressed.
-  // It's only used to workaround http://crbug.com/50485.
-  // TODO(suzhe): Remove it after input methods get fixed.
-  bool suppress_next_commit_;
-
-  // Information of the last key event, for working around
-  // http://crosbug.com/6582
-  int last_key_code_;
-  bool last_key_was_up_;
-  bool last_key_filtered_no_result_;
-
-  DISALLOW_COPY_AND_ASSIGN(GtkIMContextWrapper);
-};
-
-#endif  // CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_