New InputMethod api for Views.

views/ime/input_method_gtk.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 VIEWS_IME_INPUT_METHOD_GTK_H_
+#define VIEWS_IME_INPUT_METHOD_GTK_H_
+#pragma once
+
+#include <gtk/gtk.h>
+#include <pango/pango-attributes.h>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/base/gtk/gtk_signal.h"
+#include "views/focus/focus_manager.h"
+#include "views/ime/input_method.h"
+#include "views/ime/input_method_delegate.h"
+#include "views/ime/text_input_client.h"
+#include "views/view.h"
+
+namespace views {
+
+// An InputMethod implementation based on GtkIMContext. Most code are copied
+// from chrome/browser/renderer_host/gtk_im_context_wrapper.*
+// It's intended for testing purpose.
+class InputMethodGtk : public InputMethod,
+                       public FocusChangeListener {
+ public:
+  explicit InputMethodGtk(internal::InputMethodDelegate* delegate);
+  virtual ~InputMethodGtk();
+
+  // Overridden from InputMethod:
+  virtual void set_delegate(internal::InputMethodDelegate* delegate) OVERRIDE;
+  virtual void Init(Widget* widget) OVERRIDE;
+  virtual void DispatchKeyEvent(const KeyEvent& key) OVERRIDE;
+  virtual void OnTextInputTypeChanged(View* view) OVERRIDE;
+  virtual void OnCaretBoundsChanged(View* view) OVERRIDE;
+  virtual void CancelComposition(View* view) OVERRIDE;
+  virtual std::string GetInputLocale() OVERRIDE;
+  virtual base::i18n::TextDirection GetInputTextDirection() OVERRIDE;
+  virtual bool IsActive() OVERRIDE;
+
+  // Overridden from FocusChangeListener:
+  virtual void FocusWillChange(View* focused_before, View* focused) OVERRIDE;
+
+ private:
+  // Asks the client to confirm current composition text.
+  void ConfirmComposition();
+
+  // Resets |context_| and |context_simple_|.
+  void ResetContext();
+
+  // Checks the availability of focused text input client and update focus state
+  // of |context_| and |context_simple_| accordingly.
+  void UpdateContextFocusState();
+
+  // Processes a key event that was already filtered by the input method.
+  // A VKEY_PROCESSKEY may be dispatched to the focused View.
+  void ProcessFilteredKeyPressEvent(const KeyEvent& key);
+
+  // Processes a key event that was not filtered by the input method.
+  void ProcessUnfilteredKeyPressEvent(const KeyEvent& key);
+
+  // Sends input method result caused by the given key event to the focused text
+  // input client.
+  void ProcessInputMethodResult(const KeyEvent& key, bool filtered);
+
+  // Gets the focused text input client. Returns NULL if there is no focused
+  // View or the focused View doesn't support text input.
+  TextInputClient* GetTextInputClient() const;
+
+  // Gets the text input type of the focused text input client.
+  ui::TextInputType GetTextInputType() const;
+
+  // Checks if the given view is focused. Returns true only if the view and
+  // toplevel widget are both focused.
+  bool IsViewFocused(View* view) const;
+
+  // Checks if the pending input method result needs inserting into the focused
+  // text input client as a single character.
+  bool NeedInsertChar() const;
+
+  // Checks if there is pending input method result.
+  bool HasInputMethodResult() const;
+
+  // Fabricates a key event with VKEY_PROCESSKEY key code and dispatches it to
+  // the focused View.
+  void SendFakeProcessKeyEvent(bool pressed) const;
+
+  // Synthesize a GdkEventKey based on given key event. The returned GdkEventKey
+  // must be freed with gdk_event_free().
+  GdkEvent* SynthesizeGdkEventKey(const KeyEvent& key) const;
+
+  // Convenience method to call delegate_->DispatchKeyEventPostIME().
+  void DispatchKeyEventPostIME(const KeyEvent& key) const;
+
+  // Event handlers:
+  CHROMEG_CALLBACK_1(InputMethodGtk, void, OnCommit, GtkIMContext*, gchar*);
+  CHROMEG_CALLBACK_0(InputMethodGtk, void, OnPreeditStart, GtkIMContext*);
+  CHROMEG_CALLBACK_0(InputMethodGtk, void, OnPreeditChanged, GtkIMContext*);
+  CHROMEG_CALLBACK_0(InputMethodGtk, void, OnPreeditEnd, GtkIMContext*);
+
+  CHROMEGTK_CALLBACK_0(InputMethodGtk, void, OnWidgetRealize);
+  CHROMEGTK_CALLBACK_0(InputMethodGtk, void, OnWidgetUnrealize);
+
+  CHROMEGTK_CALLBACK_1(InputMethodGtk, gboolean, OnWidgetFocusIn,
+                       GdkEventFocus*);
+  CHROMEGTK_CALLBACK_1(InputMethodGtk, gboolean, OnWidgetFocusOut,
+                       GdkEventFocus*);
+
+  internal::InputMethodDelegate* delegate_;
+  Widget* widget_;
+  View* focused_view_;
+
+  GtkIMContext* context_;
+  GtkIMContext* context_simple_;
+
+  ui::Composition composition_;
+
+  string16 result_text_;
+
+  gulong widget_realize_id_;
+  gulong widget_unrealize_id_;
+  gulong widget_focus_in_id_;
+  gulong widget_focus_out_id_;
+
+  // Indicates if the toplevel widget is focused or not.
+  bool widget_focused_;
+
+  // Indicates if |context_| and |context_simple_| are focused or not.
+  bool context_focused_;
+
+  // Indicates if we are handling a key event.
+  bool handling_key_event_;
+
+  // Indicates if there is an ongoing composition text.
+  bool composing_text_;
+
+  // Indicates if the composition text is changed or deleted.
+  bool composition_changed_;
+
+  // If it's true then all input method result received before the next key
+  // event will be discarded.
+  bool suppress_next_result_;
+};
+
+}  // namespace views
+
+#endif  // VIEWS_IME_INPUT_METHOD_GTK_H_