content/browser/renderer_host/gtk_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 "content/browser/renderer_host/gtk_key_bindings_handler.h"
   6
   7 #include <gdk/gdkkeysyms.h>
   8
   9 #include <string>
  10
  11 #include "base/logging.h"
  12 #include "base/strings/string_util.h"
  13 #include "content/public/browser/native_web_keyboard_event.h"
  14
  15 namespace content {
  16
  17 GtkKeyBindingsHandler::GtkKeyBindingsHandler(GtkWidget* parent_widget)
  18     : handler_(CreateNewHandler()) {
  19   DCHECK(GTK_IS_FIXED(parent_widget));
  20   // We need add the |handler_| object into gtk widget hierarchy, so that
  21   // gtk_bindings_activate_event() can find correct display and keymaps from
  22   // the |handler_| object.
  23   gtk_fixed_put(GTK_FIXED(parent_widget), handler_.get(), -1, -1);
  24 }
  25
  26 GtkKeyBindingsHandler::~GtkKeyBindingsHandler() {
  27   handler_.Destroy();
  28 }
  29
  30 bool GtkKeyBindingsHandler::Match(const NativeWebKeyboardEvent& wke,
  31                                   EditCommands* edit_commands) {
  32   if (wke.type == blink::WebInputEvent::Char || !wke.os_event)
  33     return false;
  34
  35   edit_commands_.clear();
  36   // If this key event matches a predefined key binding, corresponding signal
  37   // will be emitted.
  38   gtk_bindings_activate_event(GTK_OBJECT(handler_.get()), &wke.os_event->key);
  39
  40   bool matched = !edit_commands_.empty();
  41   if (edit_commands)
  42     edit_commands->swap(edit_commands_);
  43   return matched;
  44 }
  45
  46 GtkWidget* GtkKeyBindingsHandler::CreateNewHandler() {
  47   Handler* handler =
  48       static_cast<Handler*>(g_object_new(HandlerGetType(), NULL));
  49
  50   handler->owner = this;
  51
  52   // We don't need to show the |handler| object on screen, so set its size to
  53   // zero.
  54   gtk_widget_set_size_request(GTK_WIDGET(handler), 0, 0);
  55
  56   // Prevents it from handling any events by itself.
  57   gtk_widget_set_sensitive(GTK_WIDGET(handler), FALSE);
  58   gtk_widget_set_events(GTK_WIDGET(handler), 0);
  59   gtk_widget_set_can_focus(GTK_WIDGET(handler), TRUE);
  60
  61   return GTK_WIDGET(handler);
  62 }
  63
  64 void GtkKeyBindingsHandler::EditCommandMatched(
  65     const std::string& name, const std::string& value) {
  66   edit_commands_.push_back(EditCommand(name, value));
  67 }
  68
  69 void GtkKeyBindingsHandler::HandlerInit(Handler *self) {
  70   self->owner = NULL;
  71 }
  72
  73 void GtkKeyBindingsHandler::HandlerClassInit(HandlerClass *klass) {
  74   GtkTextViewClass* text_view_class = GTK_TEXT_VIEW_CLASS(klass);
  75   GtkWidgetClass* widget_class = GTK_WIDGET_CLASS(klass);
  76
  77   // Overrides all virtual methods related to editor key bindings.
  78   text_view_class->backspace = BackSpace;
  79   text_view_class->copy_clipboard = CopyClipboard;
  80   text_view_class->cut_clipboard = CutClipboard;
  81   text_view_class->delete_from_cursor = DeleteFromCursor;
  82   text_view_class->insert_at_cursor = InsertAtCursor;
  83   text_view_class->move_cursor = MoveCursor;
  84   text_view_class->paste_clipboard = PasteClipboard;
  85   text_view_class->set_anchor = SetAnchor;
  86   text_view_class->toggle_overwrite = ToggleOverwrite;
  87   widget_class->show_help = ShowHelp;
  88
  89   // "move-focus", "move-viewport", "select-all" and "toggle-cursor-visible"
  90   // have no corresponding virtual methods. Since glib 2.18 (gtk 2.14),
  91   // g_signal_override_class_handler() is introduced to override a signal
  92   // handler.
  93   g_signal_override_class_handler("move-focus",
  94                                   G_TYPE_FROM_CLASS(klass),
  95                                   G_CALLBACK(MoveFocus));
  96
  97   g_signal_override_class_handler("move-viewport",
  98                                   G_TYPE_FROM_CLASS(klass),
  99                                   G_CALLBACK(MoveViewport));
 100
 101   g_signal_override_class_handler("select-all",
 102                                   G_TYPE_FROM_CLASS(klass),
 103                                   G_CALLBACK(SelectAll));
 104
 105   g_signal_override_class_handler("toggle-cursor-visible",
 106                                   G_TYPE_FROM_CLASS(klass),
 107                                   G_CALLBACK(ToggleCursorVisible));
 108 }
 109
 110 GType GtkKeyBindingsHandler::HandlerGetType() {
 111   static volatile gsize type_id_volatile = 0;
 112   if (g_once_init_enter(&type_id_volatile)) {
 113     GType type_id = g_type_register_static_simple(
 114         GTK_TYPE_TEXT_VIEW,
 115         g_intern_static_string("GtkKeyBindingsHandler"),
 116         sizeof(HandlerClass),
 117         reinterpret_cast<GClassInitFunc>(HandlerClassInit),
 118         sizeof(Handler),
 119         reinterpret_cast<GInstanceInitFunc>(HandlerInit),
 120         static_cast<GTypeFlags>(0));
 121     g_once_init_leave(&type_id_volatile, type_id);
 122   }
 123   return type_id_volatile;
 124 }
 125
 126 GtkKeyBindingsHandler* GtkKeyBindingsHandler::GetHandlerOwner(
 127     GtkTextView* text_view) {
 128   Handler* handler = G_TYPE_CHECK_INSTANCE_CAST(
 129       text_view, HandlerGetType(), Handler);
 130   DCHECK(handler);
 131   return handler->owner;
 132 }
 133
 134 void GtkKeyBindingsHandler::BackSpace(GtkTextView* text_view) {
 135   GetHandlerOwner(text_view)
 136       ->EditCommandMatched("DeleteBackward", std::string());
 137 }
 138
 139 void GtkKeyBindingsHandler::CopyClipboard(GtkTextView* text_view) {
 140   GetHandlerOwner(text_view)->EditCommandMatched("Copy", std::string());
 141 }
 142
 143 void GtkKeyBindingsHandler::CutClipboard(GtkTextView* text_view) {
 144   GetHandlerOwner(text_view)->EditCommandMatched("Cut", std::string());
 145 }
 146
 147 void GtkKeyBindingsHandler::DeleteFromCursor(
 148     GtkTextView* text_view, GtkDeleteType type, gint count) {
 149   if (!count)
 150     return;
 151
 152   const char *commands[3] = { NULL, NULL, NULL };
 153   switch (type) {
 154     case GTK_DELETE_CHARS:
 155       commands[0] = (count > 0 ? "DeleteForward" : "DeleteBackward");
 156       break;
 157     case GTK_DELETE_WORD_ENDS:
 158       commands[0] = (count > 0 ? "DeleteWordForward" : "DeleteWordBackward");
 159       break;
 160     case GTK_DELETE_WORDS:
 161       if (count > 0) {
 162         commands[0] = "MoveWordForward";
 163         commands[1] = "DeleteWordBackward";
 164       } else {
 165         commands[0] = "MoveWordBackward";
 166         commands[1] = "DeleteWordForward";
 167       }
 168       break;
 169     case GTK_DELETE_DISPLAY_LINES:
 170       commands[0] = "MoveToBeginningOfLine";
 171       commands[1] = "DeleteToEndOfLine";
 172       break;
 173     case GTK_DELETE_DISPLAY_LINE_ENDS:
 174       commands[0] = (count > 0 ? "DeleteToEndOfLine" :
 175                      "DeleteToBeginningOfLine");
 176       break;
 177     case GTK_DELETE_PARAGRAPH_ENDS:
 178       commands[0] = (count > 0 ? "DeleteToEndOfParagraph" :
 179                      "DeleteToBeginningOfParagraph");
 180       break;
 181     case GTK_DELETE_PARAGRAPHS:
 182       commands[0] = "MoveToBeginningOfParagraph";
 183       commands[1] = "DeleteToEndOfParagraph";
 184       break;
 185     default:
 186       // GTK_DELETE_WHITESPACE has no corresponding editor command.
 187       return;
 188   }
 189
 190   GtkKeyBindingsHandler* owner = GetHandlerOwner(text_view);
 191   if (count < 0)
 192     count = -count;
 193   for (; count > 0; --count) {
 194     for (const char* const* p = commands; *p; ++p)
 195       owner->EditCommandMatched(*p, std::string());
 196   }
 197 }
 198
 199 void GtkKeyBindingsHandler::InsertAtCursor(GtkTextView* text_view,
 200                                            const gchar* str) {
 201   if (str && *str)
 202     GetHandlerOwner(text_view)->EditCommandMatched("InsertText", str);
 203 }
 204
 205 void GtkKeyBindingsHandler::MoveCursor(
 206     GtkTextView* text_view, GtkMovementStep step, gint count,
 207     gboolean extend_selection) {
 208   if (!count)
 209     return;
 210
 211   std::string command;
 212   switch (step) {
 213     case GTK_MOVEMENT_LOGICAL_POSITIONS:
 214       command = (count > 0 ? "MoveForward" : "MoveBackward");
 215       break;
 216     case GTK_MOVEMENT_VISUAL_POSITIONS:
 217       command = (count > 0 ? "MoveRight" : "MoveLeft");
 218       break;
 219     case GTK_MOVEMENT_WORDS:
 220       command = (count > 0 ? "MoveWordRight" : "MoveWordLeft");
 221       break;
 222     case GTK_MOVEMENT_DISPLAY_LINES:
 223       command = (count > 0 ? "MoveDown" : "MoveUp");
 224       break;
 225     case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
 226       command = (count > 0 ? "MoveToEndOfLine" : "MoveToBeginningOfLine");
 227       break;
 228     case GTK_MOVEMENT_PARAGRAPH_ENDS:
 229       command = (count > 0 ? "MoveToEndOfParagraph" :
 230                  "MoveToBeginningOfParagraph");
 231       break;
 232     case GTK_MOVEMENT_PAGES:
 233       command = (count > 0 ? "MovePageDown" : "MovePageUp");
 234       break;
 235     case GTK_MOVEMENT_BUFFER_ENDS:
 236       command = (count > 0 ? "MoveToEndOfDocument" :
 237                  "MoveToBeginningOfDocument");
 238       break;
 239     default:
 240       // GTK_MOVEMENT_PARAGRAPHS and GTK_MOVEMENT_HORIZONTAL_PAGES have
 241       // no corresponding editor commands.
 242       return;
 243   }
 244
 245   GtkKeyBindingsHandler* owner = GetHandlerOwner(text_view);
 246   if (extend_selection)
 247     command.append("AndModifySelection");
 248   if (count < 0)
 249     count = -count;
 250   for (; count > 0; --count)
 251     owner->EditCommandMatched(command, std::string());
 252 }
 253
 254 void GtkKeyBindingsHandler::MoveViewport(
 255     GtkTextView* text_view, GtkScrollStep step, gint count) {
 256   // Not supported by webkit.
 257 }
 258
 259 void GtkKeyBindingsHandler::PasteClipboard(GtkTextView* text_view) {
 260   GetHandlerOwner(text_view)->EditCommandMatched("Paste", std::string());
 261 }
 262
 263 void GtkKeyBindingsHandler::SelectAll(GtkTextView* text_view, gboolean select) {
 264   if (select)
 265     GetHandlerOwner(text_view)->EditCommandMatched("SelectAll", std::string());
 266   else
 267     GetHandlerOwner(text_view)->EditCommandMatched("Unselect", std::string());
 268 }
 269
 270 void GtkKeyBindingsHandler::SetAnchor(GtkTextView* text_view) {
 271   GetHandlerOwner(text_view)->EditCommandMatched("SetMark", std::string());
 272 }
 273
 274 void GtkKeyBindingsHandler::ToggleCursorVisible(GtkTextView* text_view) {
 275   // Not supported by webkit.
 276 }
 277
 278 void GtkKeyBindingsHandler::ToggleOverwrite(GtkTextView* text_view) {
 279   // Not supported by webkit.
 280 }
 281
 282 gboolean GtkKeyBindingsHandler::ShowHelp(GtkWidget* widget,
 283                                          GtkWidgetHelpType arg1) {
 284   // Just for disabling the default handler.
 285   return FALSE;
 286 }
 287
 288 void GtkKeyBindingsHandler::MoveFocus(GtkWidget* widget,
 289                                       GtkDirectionType arg1) {
 290   // Just for disabling the default handler.
 291 }
 292
 293 }  // namespace content