chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc

   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 #include "chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h"
   6
   7 #include <gdk/gdk.h>
   8 #include <gdk/gdkkeysyms.h>
   9 #include <gdk/gdkx.h>
  10
  11 #include <gtk/gtk.h>
  12
  13 #include <X11/X.h>
  14 #include <X11/Xlib.h>
  15
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "ui/base/ime/composition_text.h"
  19 #include "ui/base/ime/composition_text_util_pango.h"
  20 #include "ui/base/ime/text_input_client.h"
  21 #include "ui/events/event.h"
  22 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
  23 #include "ui/gfx/x/x11_types.h"
  24
  25 namespace libgtk2ui {
  26
  27 X11InputMethodContextImplGtk2::X11InputMethodContextImplGtk2(
  28     ui::LinuxInputMethodContextDelegate* delegate)
  29     : delegate_(delegate),
  30       gtk_context_simple_(NULL),
  31       gtk_multicontext_(NULL),
  32       gtk_context_(NULL),
  33       gdk_last_set_client_window_(NULL) {
  34   CHECK(delegate_);
  35
  36   ResetXModifierKeycodesCache();
  37
  38   gtk_context_simple_ = gtk_im_context_simple_new();
  39   gtk_multicontext_ = gtk_im_multicontext_new();
  40
  41   GtkIMContext* contexts[] = {gtk_context_simple_, gtk_multicontext_};
  42   for (size_t i = 0; i < arraysize(contexts); ++i) {
  43     g_signal_connect(contexts[i], "commit",
  44                      G_CALLBACK(OnCommitThunk), this);
  45     g_signal_connect(contexts[i], "preedit-changed",
  46                      G_CALLBACK(OnPreeditChangedThunk), this);
  47     g_signal_connect(contexts[i], "preedit-end",
  48                      G_CALLBACK(OnPreeditEndThunk), this);
  49     g_signal_connect(contexts[i], "preedit-start",
  50                      G_CALLBACK(OnPreeditStartThunk), this);
  51     // TODO(yukishiino): Handle operations on surrounding text.
  52     // "delete-surrounding" and "retrieve-surrounding" signals should be
  53     // handled.
  54   }
  55 }
  56
  57 X11InputMethodContextImplGtk2::~X11InputMethodContextImplGtk2() {
  58   gtk_context_ = NULL;
  59   if (gtk_context_simple_) {
  60     g_object_unref(gtk_context_simple_);
  61     gtk_context_simple_ = NULL;
  62   }
  63   if (gtk_multicontext_) {
  64     g_object_unref(gtk_multicontext_);
  65     gtk_multicontext_ = NULL;
  66   }
  67 }
  68
  69 // Overriden from ui::LinuxInputMethodContext
  70
  71 bool X11InputMethodContextImplGtk2::DispatchKeyEvent(
  72     const ui::KeyEvent& key_event) {
  73   if (!key_event.HasNativeEvent())
  74     return false;
  75
  76   // The caller must call Focus() first.
  77   if (!gtk_context_)
  78     return false;
  79
  80   // Translate a XKeyEvent to a GdkEventKey.
  81   GdkEvent* event = GdkEventFromNativeEvent(key_event.native_event());
  82   if (!event) {
  83     LOG(ERROR) << "Cannot translate a XKeyEvent to a GdkEvent.";
  84     return false;
  85   }
  86
  87   // Set the client window and cursor location.
  88   if (event->key.window != gdk_last_set_client_window_) {
  89     gtk_im_context_set_client_window(gtk_context_, event->key.window);
  90     gdk_last_set_client_window_ = event->key.window;
  91   }
  92   // Convert the last known caret bounds relative to the screen coordinates
  93   // to a GdkRectangle relative to the client window.
  94   gint x = 0;
  95   gint y = 0;
  96   gdk_window_get_origin(event->key.window, &x, &y);
  97   GdkRectangle rect = {last_caret_bounds_.x() - x,
  98                        last_caret_bounds_.y() - y,
  99                        last_caret_bounds_.width(),
 100                        last_caret_bounds_.height()};
 101   gtk_im_context_set_cursor_location(gtk_context_, &rect);
 102
 103   // Let an IME handle the key event.
 104   commit_signal_trap_.StartTrap(event->key.keyval);
 105   const gboolean handled = gtk_im_context_filter_keypress(gtk_context_,
 106                                                           &event->key);
 107   commit_signal_trap_.StopTrap();
 108   gdk_event_free(event);
 109
 110   return handled && !commit_signal_trap_.IsSignalCaught();
 111 }
 112
 113 void X11InputMethodContextImplGtk2::Reset() {
 114   // Reset all the states of the context, not only preedit, caret but also
 115   // focus.
 116   gtk_context_ = NULL;
 117   gtk_im_context_reset(gtk_context_simple_);
 118   gtk_im_context_reset(gtk_multicontext_);
 119   gtk_im_context_focus_out(gtk_context_simple_);
 120   gtk_im_context_focus_out(gtk_multicontext_);
 121   gdk_last_set_client_window_ = NULL;
 122 }
 123
 124 void X11InputMethodContextImplGtk2::OnTextInputTypeChanged(
 125     ui::TextInputType text_input_type) {
 126   switch (text_input_type) {
 127     case ui::TEXT_INPUT_TYPE_NONE:
 128     case ui::TEXT_INPUT_TYPE_PASSWORD:
 129       gtk_context_ = gtk_context_simple_;
 130       break;
 131     default:
 132       gtk_context_ = gtk_multicontext_;
 133   }
 134   gtk_im_context_focus_in(gtk_context_);
 135 }
 136
 137 void X11InputMethodContextImplGtk2::OnCaretBoundsChanged(
 138     const gfx::Rect& caret_bounds) {
 139   // Remember the caret bounds so that we can set the cursor location later.
 140   // gtk_im_context_set_cursor_location() takes the location relative to the
 141   // client window, which is unknown at this point.  So we'll call
 142   // gtk_im_context_set_cursor_location() later in ProcessKeyEvent() where
 143   // (and only where) we know the client window.
 144   last_caret_bounds_ = caret_bounds;
 145 }
 146
 147 // private:
 148
 149 void X11InputMethodContextImplGtk2::ResetXModifierKeycodesCache() {
 150   modifier_keycodes_.clear();
 151   meta_keycodes_.clear();
 152   super_keycodes_.clear();
 153   hyper_keycodes_.clear();
 154
 155   Display* display = gfx::GetXDisplay();
 156   const XModifierKeymap* modmap = XGetModifierMapping(display);
 157   int min_keycode = 0;
 158   int max_keycode = 0;
 159   int keysyms_per_keycode = 1;
 160   XDisplayKeycodes(display, &min_keycode, &max_keycode);
 161   const KeySym* keysyms = XGetKeyboardMapping(
 162       display, min_keycode, max_keycode - min_keycode + 1,
 163       &keysyms_per_keycode);
 164   for (int i = 0; i < 8 * modmap->max_keypermod; ++i) {
 165     const int keycode = modmap->modifiermap[i];
 166     if (!keycode)
 167       continue;
 168     modifier_keycodes_.insert(keycode);
 169
 170     if (!keysyms)
 171       continue;
 172     for (int j = 0; j < keysyms_per_keycode; ++j) {
 173       switch (keysyms[(keycode - min_keycode) * keysyms_per_keycode + j]) {
 174         case XK_Meta_L:
 175         case XK_Meta_R:
 176           meta_keycodes_.push_back(keycode);
 177           break;
 178         case XK_Super_L:
 179         case XK_Super_R:
 180           super_keycodes_.push_back(keycode);
 181           break;
 182         case XK_Hyper_L:
 183         case XK_Hyper_R:
 184           hyper_keycodes_.push_back(keycode);
 185           break;
 186       }
 187     }
 188   }
 189   XFree(const_cast<KeySym*>(keysyms));
 190   XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 191 }
 192
 193 GdkEvent* X11InputMethodContextImplGtk2::GdkEventFromNativeEvent(
 194     const base::NativeEvent& native_event) {
 195   XEvent xkeyevent;
 196   if (native_event->type == GenericEvent) {
 197     // If this is an XI2 key event, build a matching core X event, to avoid
 198     // having two cases for every use.
 199     ui::InitXKeyEventFromXIDeviceEvent(*native_event, &xkeyevent);
 200   } else {
 201     DCHECK(native_event->type == KeyPress || native_event->type == KeyRelease);
 202     xkeyevent.xkey = native_event->xkey;
 203   }
 204   XKeyEvent& xkey = xkeyevent.xkey;
 205
 206   // Get a GdkDisplay.
 207   GdkDisplay* display = gdk_x11_lookup_xdisplay(xkey.display);
 208   if (!display) {
 209     // Fall back to the default display.
 210     display = gdk_display_get_default();
 211   }
 212   if (!display) {
 213     LOG(ERROR) << "Cannot get a GdkDisplay for a key event.";
 214     return NULL;
 215   }
 216   // Get a keysym and group.
 217   KeySym keysym = NoSymbol;
 218   guint8 keyboard_group = 0;
 219   XLookupString(&xkey, NULL, 0, &keysym, NULL);
 220   GdkKeymap* keymap = gdk_keymap_get_for_display(display);
 221   GdkKeymapKey* keys = NULL;
 222   guint* keyvals = NULL;
 223   gint n_entries = 0;
 224   if (keymap &&
 225       gdk_keymap_get_entries_for_keycode(keymap, xkey.keycode,
 226                                          &keys, &keyvals, &n_entries)) {
 227     for (gint i = 0; i < n_entries; ++i) {
 228       if (keyvals[i] == keysym) {
 229         keyboard_group = keys[i].group;
 230         break;
 231       }
 232     }
 233   }
 234   g_free(keys);
 235   keys = NULL;
 236   g_free(keyvals);
 237   keyvals = NULL;
 238   // Get a GdkWindow.
 239   GdkWindow* window = gdk_x11_window_lookup_for_display(display, xkey.window);
 240   if (window)
 241     g_object_ref(window);
 242   else
 243     window = gdk_x11_window_foreign_new_for_display(display, xkey.window);
 244   if (!window) {
 245     LOG(ERROR) << "Cannot get a GdkWindow for a key event.";
 246     return NULL;
 247   }
 248
 249   // Create a GdkEvent.
 250   GdkEventType event_type = xkey.type == KeyPress ?
 251                             GDK_KEY_PRESS : GDK_KEY_RELEASE;
 252   GdkEvent* event = gdk_event_new(event_type);
 253   event->key.type = event_type;
 254   event->key.window = window;
 255   // GdkEventKey and XKeyEvent share the same definition for time and state.
 256   event->key.send_event = xkey.send_event;
 257   event->key.time = xkey.time;
 258   event->key.state = xkey.state;
 259   event->key.keyval = keysym;
 260   event->key.length = 0;
 261   event->key.string = NULL;
 262   event->key.hardware_keycode = xkey.keycode;
 263   event->key.group = keyboard_group;
 264   event->key.is_modifier = IsKeycodeModifierKey(xkey.keycode);
 265
 266   char keybits[32] = {0};
 267   XQueryKeymap(xkey.display, keybits);
 268   if (IsAnyOfKeycodesPressed(meta_keycodes_, keybits, sizeof keybits * 8))
 269     event->key.state |= GDK_META_MASK;
 270   if (IsAnyOfKeycodesPressed(super_keycodes_, keybits, sizeof keybits * 8))
 271     event->key.state |= GDK_SUPER_MASK;
 272   if (IsAnyOfKeycodesPressed(hyper_keycodes_, keybits, sizeof keybits * 8))
 273     event->key.state |= GDK_HYPER_MASK;
 274
 275   return event;
 276 }
 277
 278 bool X11InputMethodContextImplGtk2::IsKeycodeModifierKey(
 279     unsigned int keycode) const {
 280   return modifier_keycodes_.find(keycode) != modifier_keycodes_.end();
 281 }
 282
 283 bool X11InputMethodContextImplGtk2::IsAnyOfKeycodesPressed(
 284     const std::vector<int>& keycodes,
 285     const char* keybits,
 286     int num_keys) const {
 287   for (size_t i = 0; i < keycodes.size(); ++i) {
 288     const int keycode = keycodes[i];
 289     if (keycode < 0 || num_keys <= keycode)
 290       continue;
 291     if (keybits[keycode / 8] & 1 << (keycode % 8))
 292       return true;
 293   }
 294   return false;
 295 }
 296
 297 // GtkIMContext event handlers.
 298
 299 void X11InputMethodContextImplGtk2::OnCommit(GtkIMContext* context,
 300                                              gchar* text) {
 301   if (context != gtk_context_)
 302     return;
 303
 304   const base::string16& text_in_utf16 = base::UTF8ToUTF16(text);
 305   // If an underlying IME is emitting the "commit" signal to insert a character
 306   // for a direct input key event, ignores the insertion of the character at
 307   // this point, because we have to call DispatchKeyEventPostIME() for direct
 308   // input key events.  DispatchKeyEvent() takes care of the trapped character
 309   // and calls DispatchKeyEventPostIME().
 310   if (commit_signal_trap_.Trap(text_in_utf16))
 311     return;
 312
 313   delegate_->OnCommit(text_in_utf16);
 314 }
 315
 316 void X11InputMethodContextImplGtk2::OnPreeditChanged(GtkIMContext* context) {
 317   if (context != gtk_context_)
 318     return;
 319
 320   gchar* str = NULL;
 321   PangoAttrList* attrs = NULL;
 322   gint cursor_pos = 0;
 323   gtk_im_context_get_preedit_string(context, &str, &attrs, &cursor_pos);
 324   ui::CompositionText composition_text;
 325   ui::ExtractCompositionTextFromGtkPreedit(str, attrs, cursor_pos,
 326                                            &composition_text);
 327   g_free(str);
 328   pango_attr_list_unref(attrs);
 329
 330   delegate_->OnPreeditChanged(composition_text);
 331 }
 332
 333 void X11InputMethodContextImplGtk2::OnPreeditEnd(GtkIMContext* context) {
 334   if (context != gtk_context_)
 335     return;
 336
 337   delegate_->OnPreeditEnd();
 338 }
 339
 340 void X11InputMethodContextImplGtk2::OnPreeditStart(GtkIMContext* context) {
 341   if (context != gtk_context_)
 342     return;
 343
 344   delegate_->OnPreeditStart();
 345 }
 346
 347 // GtkCommitSignalTrap
 348
 349 X11InputMethodContextImplGtk2::GtkCommitSignalTrap::GtkCommitSignalTrap()
 350     : is_trap_enabled_(false),
 351       gdk_event_key_keyval_(GDK_KEY_VoidSymbol),
 352       is_signal_caught_(false) {}
 353
 354 void X11InputMethodContextImplGtk2::GtkCommitSignalTrap::StartTrap(
 355     guint keyval) {
 356   is_signal_caught_ = false;
 357   gdk_event_key_keyval_ = keyval;
 358   is_trap_enabled_ = true;
 359 }
 360
 361 void X11InputMethodContextImplGtk2::GtkCommitSignalTrap::StopTrap() {
 362   is_trap_enabled_ = false;
 363 }
 364
 365 bool X11InputMethodContextImplGtk2::GtkCommitSignalTrap::Trap(
 366     const base::string16& text) {
 367   DCHECK(!is_signal_caught_);
 368   if (is_trap_enabled_ &&
 369       text.length() == 1 &&
 370       text[0] == gdk_keyval_to_unicode(gdk_event_key_keyval_)) {
 371     is_signal_caught_ = true;
 372     return true;
 373   } else {
 374     return false;
 375   }
 376 }
 377
 378 }  // namespace libgtk2ui