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.
5 #ifndef CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
6 #define CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
10 #include "base/containers/hash_tables.h"
11 #include "base/event_types.h"
12 #include "base/gtest_prod_util.h"
13 #include "base/strings/string16.h"
14 #include "ui/base/glib/glib_integers.h"
15 #include "ui/base/glib/glib_signal.h"
16 #include "ui/base/ime/linux/linux_input_method_context.h"
17 #include "ui/gfx/rect.h"
19 typedef union _GdkEvent GdkEvent;
20 typedef struct _GdkDrawable GdkWindow;
21 typedef struct _GtkIMContext GtkIMContext;
25 // An implementation of LinuxInputMethodContext which is based on X11 event loop
26 // and uses GtkIMContext(gtk-immodule) as a bridge from/to underlying IMEs.
27 class X11InputMethodContextImplGtk2 : public ui::LinuxInputMethodContext {
29 explicit X11InputMethodContextImplGtk2(
30 ui::LinuxInputMethodContextDelegate* delegate);
31 ~X11InputMethodContextImplGtk2() override;
33 // Overriden from ui::LinuxInputMethodContext
34 bool DispatchKeyEvent(const ui::KeyEvent& key_event) override;
35 void Reset() override;
36 void OnTextInputTypeChanged(ui::TextInputType text_input_type) override;
37 void OnCaretBoundsChanged(const gfx::Rect& caret_bounds) override;
40 // Resets the cache of X modifier keycodes.
41 // TODO(yukishiino): We should call this method whenever X keyboard mapping
42 // changes, for example when a user switched to another keyboard layout.
43 void ResetXModifierKeycodesCache();
45 // Constructs a GdkEventKey from a XKeyEvent and returns it. Otherwise,
46 // returns NULL. The returned GdkEvent must be freed by gdk_event_free.
47 GdkEvent* GdkEventFromNativeEvent(const base::NativeEvent& native_event);
49 // Returns true if the hardware |keycode| is assigned to a modifier key.
50 bool IsKeycodeModifierKey(unsigned int keycode) const;
52 // Returns true if one of |keycodes| is pressed. |keybits| is a bit vector
53 // returned by XQueryKeymap, and |num_keys| is the number of keys in
55 bool IsAnyOfKeycodesPressed(const std::vector<int>& keycodes,
59 // GtkIMContext event handlers. They are shared among |gtk_context_simple_|
60 // and |gtk_multicontext_|.
61 CHROMEG_CALLBACK_1(X11InputMethodContextImplGtk2, void, OnCommit,
62 GtkIMContext*, gchar*);
63 CHROMEG_CALLBACK_0(X11InputMethodContextImplGtk2, void, OnPreeditChanged,
65 CHROMEG_CALLBACK_0(X11InputMethodContextImplGtk2, void, OnPreeditEnd,
67 CHROMEG_CALLBACK_0(X11InputMethodContextImplGtk2, void, OnPreeditStart,
70 // A set of callback functions. Must not be NULL.
71 ui::LinuxInputMethodContextDelegate* delegate_;
73 // IME's input context used for TEXT_INPUT_TYPE_NONE and
74 // TEXT_INPUT_TYPE_PASSWORD.
75 GtkIMContext* gtk_context_simple_;
76 // IME's input context used for the other text input types.
77 GtkIMContext* gtk_multicontext_;
79 // An alias to |gtk_context_simple_| or |gtk_multicontext_| depending on the
80 // text input type. Can be NULL when it's not focused.
81 GtkIMContext* gtk_context_;
83 // Last set client window.
84 GdkWindow* gdk_last_set_client_window_;
86 // Last known caret bounds relative to the screen coordinates.
87 gfx::Rect last_caret_bounds_;
89 // A set of hardware keycodes of modifier keys.
90 base::hash_set<unsigned int> modifier_keycodes_;
92 // A list of keycodes of each modifier key.
93 std::vector<int> meta_keycodes_;
94 std::vector<int> super_keycodes_;
95 std::vector<int> hyper_keycodes_;
97 // The helper class to trap GTK+'s "commit" signal for direct input key
100 // gtk_im_context_filter_keypress() emits "commit" signal in order to insert
101 // a character which is not actually processed by a IME. This behavior seems,
102 // in Javascript world, that a keydown event with keycode = VKEY_PROCESSKEY
103 // (= 229) is fired. So we have to trap such "commit" signal for direct input
104 // key events. This class helps to trap such events.
105 class GtkCommitSignalTrap {
107 GtkCommitSignalTrap();
109 // Enables the trap which monitors a direct input key event of |keyval|.
110 void StartTrap(guint keyval);
112 // Disables the trap.
115 // Checks if the committed |text| has come from a direct input key event,
116 // and returns true in that case. Once it's trapped, IsSignalCaught()
118 // Must be called at most once between StartTrap() and StopTrap().
119 bool Trap(const base::string16& text);
121 // Returns true if a direct input key event is detected.
122 bool IsSignalCaught() const { return is_signal_caught_; }
125 bool is_trap_enabled_;
126 guint gdk_event_key_keyval_;
127 bool is_signal_caught_;
129 DISALLOW_COPY_AND_ASSIGN(GtkCommitSignalTrap);
132 GtkCommitSignalTrap commit_signal_trap_;
134 FRIEND_TEST_ALL_PREFIXES(X11InputMethodContextImplGtk2FriendTest,
135 GtkCommitSignalTrap);
137 DISALLOW_COPY_AND_ASSIGN(X11InputMethodContextImplGtk2);
140 } // namespace libgtk2ui
142 #endif // CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_