chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.cc

   1 // Copyright (c) 2012 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/gtk2_key_bindings_handler.h"
   6
   7 #include <gdk/gdkkeysyms.h>
   8 #include <X11/Xlib.h>
   9 #include <X11/XKBlib.h>
  10
  11 #include <string>
  12
  13 #include "base/logging.h"
  14 #include "base/strings/string_util.h"
  15 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
  16 #include "content/public/browser/native_web_keyboard_event.h"
  17 #include "ui/base/x/x11_util.h"
  18 #include "ui/events/event.h"
  19
  20 using ui::TextEditCommandAuraLinux;
  21
  22 // TODO(erg): Rewrite the old gtk_key_bindings_handler_unittest.cc and get them
  23 // in a state that links. This code was adapted from the content layer GTK
  24 // code, which had some simple unit tests. However, the changes in the public
  25 // interface basically meant the tests need to be rewritten; this imposes weird
  26 // linking requirements regarding GTK+ as we don't have a libgtk2ui_unittests
  27 // yet. http://crbug.com/358297.
  28
  29 namespace libgtk2ui {
  30
  31 Gtk2KeyBindingsHandler::Gtk2KeyBindingsHandler()
  32     : fake_window_(gtk_offscreen_window_new()),
  33       handler_(CreateNewHandler()),
  34       has_xkb_(false) {
  35   gtk_container_add(GTK_CONTAINER(fake_window_), handler_.get());
  36
  37   int opcode, event, error;
  38   int major = XkbMajorVersion;
  39   int minor = XkbMinorVersion;
  40   has_xkb_ = XkbQueryExtension(gfx::GetXDisplay(), &opcode, &event, &error,
  41                                &major, &minor);
  42 }
  43
  44 Gtk2KeyBindingsHandler::~Gtk2KeyBindingsHandler() {
  45   handler_.Destroy();
  46   gtk_widget_destroy(fake_window_);
  47 }
  48
  49 bool Gtk2KeyBindingsHandler::MatchEvent(
  50     const ui::Event& event,
  51     std::vector<TextEditCommandAuraLinux>* edit_commands) {
  52   CHECK(event.IsKeyEvent());
  53
  54   const ui::KeyEvent& key_event = static_cast<const ui::KeyEvent&>(event);
  55   if (key_event.is_char() || !key_event.native_event())
  56     return false;
  57
  58   GdkEventKey gdk_event;
  59   BuildGdkEventKeyFromXEvent(key_event.native_event(), &gdk_event);
  60
  61   edit_commands_.clear();
  62   // If this key event matches a predefined key binding, corresponding signal
  63   // will be emitted.
  64   gtk_bindings_activate_event(GTK_OBJECT(handler_.get()), &gdk_event);
  65
  66   bool matched = !edit_commands_.empty();
  67   if (edit_commands)
  68     edit_commands->swap(edit_commands_);
  69   return matched;
  70 }
  71
  72 GtkWidget* Gtk2KeyBindingsHandler::CreateNewHandler() {
  73   Handler* handler =
  74       static_cast<Handler*>(g_object_new(HandlerGetType(), NULL));
  75
  76   handler->owner = this;
  77
  78   // We don't need to show the |handler| object on screen, so set its size to
  79   // zero.
  80   gtk_widget_set_size_request(GTK_WIDGET(handler), 0, 0);
  81
  82   // Prevents it from handling any events by itself.
  83   gtk_widget_set_sensitive(GTK_WIDGET(handler), FALSE);
  84   gtk_widget_set_events(GTK_WIDGET(handler), 0);
  85   gtk_widget_set_can_focus(GTK_WIDGET(handler), TRUE);
  86
  87   return GTK_WIDGET(handler);
  88 }
  89
  90 void Gtk2KeyBindingsHandler::EditCommandMatched(
  91     TextEditCommandAuraLinux::CommandId id,
  92     const std::string& value,
  93     bool extend_selection) {
  94   edit_commands_.push_back(TextEditCommandAuraLinux(id,
  95                                                     value,
  96                                                     extend_selection));
  97 }
  98
  99 void Gtk2KeyBindingsHandler::BuildGdkEventKeyFromXEvent(
 100     const base::NativeEvent& xevent,
 101     GdkEventKey* gdk_event) {
 102   GdkKeymap *keymap = gdk_keymap_get_for_display(gdk_display_get_default());
 103   GdkModifierType consumed, state;
 104
 105   gdk_event->type = xevent->xany.type == KeyPress ?
 106                     GDK_KEY_PRESS : GDK_KEY_RELEASE;
 107   gdk_event->time = xevent->xkey.time;
 108   gdk_event->state = static_cast<GdkModifierType>(xevent->xkey.state);
 109   gdk_event->hardware_keycode = xevent->xkey.keycode;
 110
 111   if (has_xkb_) {
 112     gdk_event->group = XkbGroupForCoreState(xevent->xkey.state);
 113   } else {
 114     // The overwhelming majority of people will be using X servers that support
 115     // XKB. GDK has a fallback here that does some complicated stuff to detect
 116     // whether a modifier key affects the keybinding, but that should be
 117     // extremely rare.
 118     NOTIMPLEMENTED();
 119     gdk_event->group = 0;
 120   }
 121
 122   gdk_event->keyval = GDK_VoidSymbol;
 123   gdk_keymap_translate_keyboard_state(
 124       keymap,
 125       gdk_event->hardware_keycode,
 126       static_cast<GdkModifierType>(gdk_event->state),
 127       gdk_event->group,
 128       &gdk_event->keyval,
 129       NULL, NULL, &consumed);
 130
 131   state = static_cast<GdkModifierType>(gdk_event->state & ~consumed);
 132   gdk_keymap_add_virtual_modifiers(keymap, &state);
 133   gdk_event->state |= state;
 134 }
 135
 136 void Gtk2KeyBindingsHandler::HandlerInit(Handler *self) {
 137   self->owner = NULL;
 138 }
 139
 140 void Gtk2KeyBindingsHandler::HandlerClassInit(HandlerClass *klass) {
 141   GtkTextViewClass* text_view_class = GTK_TEXT_VIEW_CLASS(klass);
 142   GtkWidgetClass* widget_class = GTK_WIDGET_CLASS(klass);
 143
 144   // Overrides all virtual methods related to editor key bindings.
 145   text_view_class->backspace = BackSpace;
 146   text_view_class->copy_clipboard = CopyClipboard;
 147   text_view_class->cut_clipboard = CutClipboard;
 148   text_view_class->delete_from_cursor = DeleteFromCursor;
 149   text_view_class->insert_at_cursor = InsertAtCursor;
 150   text_view_class->move_cursor = MoveCursor;
 151   text_view_class->paste_clipboard = PasteClipboard;
 152   text_view_class->set_anchor = SetAnchor;
 153   text_view_class->toggle_overwrite = ToggleOverwrite;
 154   widget_class->show_help = ShowHelp;
 155
 156   // "move-focus", "move-viewport", "select-all" and "toggle-cursor-visible"
 157   // have no corresponding virtual methods. Since glib 2.18 (gtk 2.14),
 158   // g_signal_override_class_handler() is introduced to override a signal
 159   // handler.
 160   g_signal_override_class_handler("move-focus",
 161                                   G_TYPE_FROM_CLASS(klass),
 162                                   G_CALLBACK(MoveFocus));
 163
 164   g_signal_override_class_handler("move-viewport",
 165                                   G_TYPE_FROM_CLASS(klass),
 166                                   G_CALLBACK(MoveViewport));
 167
 168   g_signal_override_class_handler("select-all",
 169                                   G_TYPE_FROM_CLASS(klass),
 170                                   G_CALLBACK(SelectAll));
 171
 172   g_signal_override_class_handler("toggle-cursor-visible",
 173                                   G_TYPE_FROM_CLASS(klass),
 174                                   G_CALLBACK(ToggleCursorVisible));
 175 }
 176
 177 GType Gtk2KeyBindingsHandler::HandlerGetType() {
 178   static volatile gsize type_id_volatile = 0;
 179   if (g_once_init_enter(&type_id_volatile)) {
 180     GType type_id = g_type_register_static_simple(
 181         GTK_TYPE_TEXT_VIEW,
 182         g_intern_static_string("Gtk2KeyBindingsHandler"),
 183         sizeof(HandlerClass),
 184         reinterpret_cast<GClassInitFunc>(HandlerClassInit),
 185         sizeof(Handler),
 186         reinterpret_cast<GInstanceInitFunc>(HandlerInit),
 187         static_cast<GTypeFlags>(0));
 188     g_once_init_leave(&type_id_volatile, type_id);
 189   }
 190   return type_id_volatile;
 191 }
 192
 193 Gtk2KeyBindingsHandler* Gtk2KeyBindingsHandler::GetHandlerOwner(
 194     GtkTextView* text_view) {
 195   Handler* handler = G_TYPE_CHECK_INSTANCE_CAST(
 196       text_view, HandlerGetType(), Handler);
 197   DCHECK(handler);
 198   return handler->owner;
 199 }
 200
 201 void Gtk2KeyBindingsHandler::BackSpace(GtkTextView* text_view) {
 202   GetHandlerOwner(text_view)
 203       ->EditCommandMatched(
 204           TextEditCommandAuraLinux::DELETE_BACKWARD, std::string(), false);
 205 }
 206
 207 void Gtk2KeyBindingsHandler::CopyClipboard(GtkTextView* text_view) {
 208   GetHandlerOwner(text_view)->EditCommandMatched(
 209       TextEditCommandAuraLinux::COPY, std::string(), false);
 210 }
 211
 212 void Gtk2KeyBindingsHandler::CutClipboard(GtkTextView* text_view) {
 213   GetHandlerOwner(text_view)->EditCommandMatched(
 214       TextEditCommandAuraLinux::CUT, std::string(), false);
 215 }
 216
 217 void Gtk2KeyBindingsHandler::DeleteFromCursor(
 218     GtkTextView* text_view, GtkDeleteType type, gint count) {
 219   if (!count)
 220     return;
 221
 222   TextEditCommandAuraLinux::CommandId commands[2] = {
 223     TextEditCommandAuraLinux::INVALID_COMMAND,
 224     TextEditCommandAuraLinux::INVALID_COMMAND,
 225   };
 226   switch (type) {
 227     case GTK_DELETE_CHARS:
 228       commands[0] = (count > 0 ?
 229           TextEditCommandAuraLinux::DELETE_FORWARD :
 230           TextEditCommandAuraLinux::DELETE_BACKWARD);
 231       break;
 232     case GTK_DELETE_WORD_ENDS:
 233       commands[0] = (count > 0 ?
 234           TextEditCommandAuraLinux::DELETE_WORD_FORWARD :
 235           TextEditCommandAuraLinux::DELETE_WORD_BACKWARD);
 236       break;
 237     case GTK_DELETE_WORDS:
 238       if (count > 0) {
 239         commands[0] = TextEditCommandAuraLinux::MOVE_WORD_FORWARD;
 240         commands[1] = TextEditCommandAuraLinux::DELETE_WORD_BACKWARD;
 241       } else {
 242         commands[0] = TextEditCommandAuraLinux::MOVE_WORD_BACKWARD;
 243         commands[1] = TextEditCommandAuraLinux::DELETE_WORD_FORWARD;
 244       }
 245       break;
 246     case GTK_DELETE_DISPLAY_LINES:
 247       commands[0] = TextEditCommandAuraLinux::MOVE_TO_BEGINING_OF_LINE;
 248       commands[1] = TextEditCommandAuraLinux::DELETE_TO_END_OF_LINE;
 249       break;
 250     case GTK_DELETE_DISPLAY_LINE_ENDS:
 251       commands[0] = (count > 0 ?
 252           TextEditCommandAuraLinux::DELETE_TO_END_OF_LINE :
 253           TextEditCommandAuraLinux::DELETE_TO_BEGINING_OF_LINE);
 254       break;
 255     case GTK_DELETE_PARAGRAPH_ENDS:
 256       commands[0] = (count > 0 ?
 257           TextEditCommandAuraLinux::DELETE_TO_END_OF_PARAGRAPH :
 258           TextEditCommandAuraLinux::DELETE_TO_BEGINING_OF_PARAGRAPH);
 259       break;
 260     case GTK_DELETE_PARAGRAPHS:
 261       commands[0] =
 262           TextEditCommandAuraLinux::MOVE_TO_BEGINING_OF_PARAGRAPH;
 263       commands[1] =
 264           TextEditCommandAuraLinux::DELETE_TO_END_OF_PARAGRAPH;
 265       break;
 266     default:
 267       // GTK_DELETE_WHITESPACE has no corresponding editor command.
 268       return;
 269   }
 270
 271   Gtk2KeyBindingsHandler* owner = GetHandlerOwner(text_view);
 272   if (count < 0)
 273     count = -count;
 274   for (; count > 0; --count) {
 275     for (size_t i = 0; i < arraysize(commands); ++i)
 276       if (commands[i] != TextEditCommandAuraLinux::INVALID_COMMAND)
 277         owner->EditCommandMatched(commands[i], std::string(), false);
 278   }
 279 }
 280
 281 void Gtk2KeyBindingsHandler::InsertAtCursor(GtkTextView* text_view,
 282                                             const gchar* str) {
 283   if (str && *str)
 284     GetHandlerOwner(text_view)->EditCommandMatched(
 285         TextEditCommandAuraLinux::INSERT_TEXT, str, false);
 286 }
 287
 288 void Gtk2KeyBindingsHandler::MoveCursor(
 289     GtkTextView* text_view, GtkMovementStep step, gint count,
 290     gboolean extend_selection) {
 291   if (!count)
 292     return;
 293
 294   TextEditCommandAuraLinux::CommandId command;
 295   switch (step) {
 296     case GTK_MOVEMENT_LOGICAL_POSITIONS:
 297       command = (count > 0 ?
 298                  TextEditCommandAuraLinux::MOVE_FORWARD :
 299                  TextEditCommandAuraLinux::MOVE_BACKWARD);
 300       break;
 301     case GTK_MOVEMENT_VISUAL_POSITIONS:
 302       command = (count > 0 ?
 303                  TextEditCommandAuraLinux::MOVE_RIGHT :
 304                  TextEditCommandAuraLinux::MOVE_LEFT);
 305       break;
 306     case GTK_MOVEMENT_WORDS:
 307       command = (count > 0 ?
 308                  TextEditCommandAuraLinux::MOVE_WORD_RIGHT :
 309                  TextEditCommandAuraLinux::MOVE_WORD_LEFT);
 310       break;
 311     case GTK_MOVEMENT_DISPLAY_LINES:
 312       command = (count > 0 ?
 313                  TextEditCommandAuraLinux::MOVE_DOWN :
 314                  TextEditCommandAuraLinux::MOVE_UP);
 315       break;
 316     case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
 317       command = (count > 0 ?
 318                  TextEditCommandAuraLinux::MOVE_TO_END_OF_LINE :
 319                  TextEditCommandAuraLinux::MOVE_TO_BEGINING_OF_LINE);
 320       break;
 321     case GTK_MOVEMENT_PARAGRAPH_ENDS:
 322       command = (count > 0 ?
 323                  TextEditCommandAuraLinux::MOVE_TO_END_OF_PARAGRAPH :
 324                  TextEditCommandAuraLinux::MOVE_TO_BEGINING_OF_PARAGRAPH);
 325       break;
 326     case GTK_MOVEMENT_PAGES:
 327       command = (count > 0 ? TextEditCommandAuraLinux::MOVE_PAGE_DOWN :
 328                  TextEditCommandAuraLinux::MOVE_PAGE_UP);
 329       break;
 330     case GTK_MOVEMENT_BUFFER_ENDS:
 331       command = (count > 0 ? TextEditCommandAuraLinux::MOVE_TO_END_OF_DOCUMENT :
 332                  TextEditCommandAuraLinux::MOVE_TO_BEGINING_OF_DOCUMENT);
 333       break;
 334     default:
 335       // GTK_MOVEMENT_PARAGRAPHS and GTK_MOVEMENT_HORIZONTAL_PAGES have
 336       // no corresponding editor commands.
 337       return;
 338   }
 339
 340   Gtk2KeyBindingsHandler* owner = GetHandlerOwner(text_view);
 341   if (count < 0)
 342     count = -count;
 343   for (; count > 0; --count)
 344     owner->EditCommandMatched(command, std::string(), extend_selection);
 345 }
 346
 347 void Gtk2KeyBindingsHandler::MoveViewport(
 348     GtkTextView* text_view, GtkScrollStep step, gint count) {
 349   // Not supported by webkit.
 350 }
 351
 352 void Gtk2KeyBindingsHandler::PasteClipboard(GtkTextView* text_view) {
 353   GetHandlerOwner(text_view)->EditCommandMatched(
 354       TextEditCommandAuraLinux::PASTE, std::string(), false);
 355 }
 356
 357 void Gtk2KeyBindingsHandler::SelectAll(GtkTextView* text_view,
 358                                        gboolean select) {
 359   if (select) {
 360     GetHandlerOwner(text_view)->EditCommandMatched(
 361         TextEditCommandAuraLinux::SELECT_ALL, std::string(), false);
 362   } else {
 363     GetHandlerOwner(text_view)->EditCommandMatched(
 364         TextEditCommandAuraLinux::UNSELECT, std::string(), false);
 365   }
 366 }
 367
 368 void Gtk2KeyBindingsHandler::SetAnchor(GtkTextView* text_view) {
 369   GetHandlerOwner(text_view)->EditCommandMatched(
 370       TextEditCommandAuraLinux::SET_MARK, std::string(), false);
 371 }
 372
 373 void Gtk2KeyBindingsHandler::ToggleCursorVisible(GtkTextView* text_view) {
 374   // Not supported by webkit.
 375 }
 376
 377 void Gtk2KeyBindingsHandler::ToggleOverwrite(GtkTextView* text_view) {
 378   // Not supported by webkit.
 379 }
 380
 381 gboolean Gtk2KeyBindingsHandler::ShowHelp(GtkWidget* widget,
 382                                           GtkWidgetHelpType arg1) {
 383   // Just for disabling the default handler.
 384   return FALSE;
 385 }
 386
 387 void Gtk2KeyBindingsHandler::MoveFocus(GtkWidget* widget,
 388                                        GtkDirectionType arg1) {
 389   // Just for disabling the default handler.
 390 }
 391
 392 }  // namespace libgtk2ui