linux_aura: Port GtkKeybindingsHandler to Aura.

chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.cc

+// Copyright (c) 2012 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.
+
+#include "chrome/browser/ui/libgtk2ui/gtk2_key_bindings_handler.h"
+
+#include <gdk/gdkkeysyms.h>
+#include <X11/Xlib.h>
+#include <X11/XKBlib.h>
+
+#include <string>
+
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "ui/base/x/x11_util.h"
+#include "ui/events/event.h"
+
+using ui::TextEditCommandX11;
+
+// TODO(erg): Rewrite the old gtk_key_bindings_handler_unittest.cc and get them
+// in a state that links. This code was adapted from the content layer GTK
+// code, which had some simple unit tests. However, the changes in the public
+// interface basically meant the tests need to be rewritten; this imposes weird
+// linking requirements regarding GTK+ as we don't have a libgtk2ui_unittests
+// yet. http://crbug.com/358297.
+
+namespace libgtk2ui {
+
+Gtk2KeyBindingsHandler::Gtk2KeyBindingsHandler()
+    : fake_window_(gtk_offscreen_window_new()),
+      handler_(CreateNewHandler()),
+      has_xkb_(false) {
+  gtk_container_add(GTK_CONTAINER(fake_window_), handler_.get());
+
+  int opcode, event, error;
+  int major = XkbMajorVersion;
+  int minor = XkbMinorVersion;
+  has_xkb_ = XkbQueryExtension(gfx::GetXDisplay(), &opcode, &event, &error,
+                               &major, &minor);
+}
+
+Gtk2KeyBindingsHandler::~Gtk2KeyBindingsHandler() {
+  handler_.Destroy();
+  gtk_widget_destroy(fake_window_);
+}
+
+bool Gtk2KeyBindingsHandler::MatchEvent(
+    const ui::Event& event,
+    std::vector<TextEditCommandX11>* edit_commands) {
+  CHECK(event.IsKeyEvent());
+
+  const ui::KeyEvent& key_event = static_cast<const ui::KeyEvent&>(event);
+  if (key_event.is_char() || !key_event.native_event())
+    return false;
+
+  GdkEventKey gdk_event;
+  BuildGdkEventKeyFromXEvent(key_event.native_event(), &gdk_event);
+
+  edit_commands_.clear();
+  // If this key event matches a predefined key binding, corresponding signal
+  // will be emitted.
+  gtk_bindings_activate_event(GTK_OBJECT(handler_.get()), &gdk_event);
+
+  bool matched = !edit_commands_.empty();
+  if (edit_commands)
+    edit_commands->swap(edit_commands_);
+  return matched;
+}
+
+GtkWidget* Gtk2KeyBindingsHandler::CreateNewHandler() {
+  Handler* handler =
+      static_cast<Handler*>(g_object_new(HandlerGetType(), NULL));
+
+  handler->owner = this;
+
+  // We don't need to show the |handler| object on screen, so set its size to
+  // zero.
+  gtk_widget_set_size_request(GTK_WIDGET(handler), 0, 0);
+
+  // Prevents it from handling any events by itself.
+  gtk_widget_set_sensitive(GTK_WIDGET(handler), FALSE);
+  gtk_widget_set_events(GTK_WIDGET(handler), 0);
+  gtk_widget_set_can_focus(GTK_WIDGET(handler), TRUE);
+
+  return GTK_WIDGET(handler);
+}
+
+void Gtk2KeyBindingsHandler::EditCommandMatched(
+    TextEditCommandX11::CommandId id,
+    const std::string& value,
+    bool extend_selection) {
+  edit_commands_.push_back(TextEditCommandX11(id, value, extend_selection));
+}
+
+void Gtk2KeyBindingsHandler::BuildGdkEventKeyFromXEvent(
+    const base::NativeEvent& xevent,
+    GdkEventKey* gdk_event) {
+  GdkKeymap *keymap = gdk_keymap_get_for_display(gdk_display_get_default());
+  GdkModifierType consumed, state;
+
+  gdk_event->type = xevent->xany.type == KeyPress ?
+                    GDK_KEY_PRESS : GDK_KEY_RELEASE;
+  gdk_event->time = xevent->xkey.time;
+  gdk_event->state = static_cast<GdkModifierType>(xevent->xkey.state);
+  gdk_event->hardware_keycode = xevent->xkey.keycode;
+
+  if (has_xkb_) {
+    gdk_event->group = XkbGroupForCoreState(xevent->xkey.state);
+  } else {
+    // The overwhelming majority of people will be using X servers that support
+    // XKB. GDK has a fallback here that does some complicated stuff to detect
+    // whether a modifier key affects the keybinding, but that should be
+    // extremely rare.
+    NOTIMPLEMENTED();
+    gdk_event->group = 0;
+  }
+
+  gdk_event->keyval = GDK_VoidSymbol;
+  gdk_keymap_translate_keyboard_state(
+      keymap,
+      gdk_event->hardware_keycode,
+      static_cast<GdkModifierType>(gdk_event->state),
+      gdk_event->group,
+      &gdk_event->keyval,
+      NULL, NULL, &consumed);
+
+  state = static_cast<GdkModifierType>(gdk_event->state & ~consumed);
+  gdk_keymap_add_virtual_modifiers(keymap, &state);
+  gdk_event->state |= state;
+}
+
+void Gtk2KeyBindingsHandler::HandlerInit(Handler *self) {
+  self->owner = NULL;
+}
+
+void Gtk2KeyBindingsHandler::HandlerClassInit(HandlerClass *klass) {
+  GtkTextViewClass* text_view_class = GTK_TEXT_VIEW_CLASS(klass);
+  GtkWidgetClass* widget_class = GTK_WIDGET_CLASS(klass);
+
+  // Overrides all virtual methods related to editor key bindings.
+  text_view_class->backspace = BackSpace;
+  text_view_class->copy_clipboard = CopyClipboard;
+  text_view_class->cut_clipboard = CutClipboard;
+  text_view_class->delete_from_cursor = DeleteFromCursor;
+  text_view_class->insert_at_cursor = InsertAtCursor;
+  text_view_class->move_cursor = MoveCursor;
+  text_view_class->paste_clipboard = PasteClipboard;
+  text_view_class->set_anchor = SetAnchor;
+  text_view_class->toggle_overwrite = ToggleOverwrite;
+  widget_class->show_help = ShowHelp;
+
+  // "move-focus", "move-viewport", "select-all" and "toggle-cursor-visible"
+  // have no corresponding virtual methods. Since glib 2.18 (gtk 2.14),
+  // g_signal_override_class_handler() is introduced to override a signal
+  // handler.
+  g_signal_override_class_handler("move-focus",
+                                  G_TYPE_FROM_CLASS(klass),
+                                  G_CALLBACK(MoveFocus));
+
+  g_signal_override_class_handler("move-viewport",
+                                  G_TYPE_FROM_CLASS(klass),
+                                  G_CALLBACK(MoveViewport));
+
+  g_signal_override_class_handler("select-all",
+                                  G_TYPE_FROM_CLASS(klass),
+                                  G_CALLBACK(SelectAll));
+
+  g_signal_override_class_handler("toggle-cursor-visible",
+                                  G_TYPE_FROM_CLASS(klass),
+                                  G_CALLBACK(ToggleCursorVisible));
+}
+
+GType Gtk2KeyBindingsHandler::HandlerGetType() {
+  static volatile gsize type_id_volatile = 0;
+  if (g_once_init_enter(&type_id_volatile)) {
+    GType type_id = g_type_register_static_simple(
+        GTK_TYPE_TEXT_VIEW,
+        g_intern_static_string("Gtk2KeyBindingsHandler"),
+        sizeof(HandlerClass),
+        reinterpret_cast<GClassInitFunc>(HandlerClassInit),
+        sizeof(Handler),
+        reinterpret_cast<GInstanceInitFunc>(HandlerInit),
+        static_cast<GTypeFlags>(0));
+    g_once_init_leave(&type_id_volatile, type_id);
+  }
+  return type_id_volatile;
+}
+
+Gtk2KeyBindingsHandler* Gtk2KeyBindingsHandler::GetHandlerOwner(
+    GtkTextView* text_view) {
+  Handler* handler = G_TYPE_CHECK_INSTANCE_CAST(
+      text_view, HandlerGetType(), Handler);
+  DCHECK(handler);
+  return handler->owner;
+}
+
+void Gtk2KeyBindingsHandler::BackSpace(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)
+      ->EditCommandMatched(
+          TextEditCommandX11::DELETE_BACKWARD, std::string(), false);
+}
+
+void Gtk2KeyBindingsHandler::CopyClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched(
+      TextEditCommandX11::COPY, std::string(), false);
+}
+
+void Gtk2KeyBindingsHandler::CutClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched(
+      TextEditCommandX11::CUT, std::string(), false);
+}
+
+void Gtk2KeyBindingsHandler::DeleteFromCursor(
+    GtkTextView* text_view, GtkDeleteType type, gint count) {
+  if (!count)
+    return;
+
+  TextEditCommandX11::CommandId commands[2] = {
+    TextEditCommandX11::INVALID_COMMAND,
+    TextEditCommandX11::INVALID_COMMAND,
+  };
+  switch (type) {
+    case GTK_DELETE_CHARS:
+      commands[0] = (count > 0 ?
+          TextEditCommandX11::DELETE_FORWARD :
+          TextEditCommandX11::DELETE_BACKWARD);
+      break;
+    case GTK_DELETE_WORD_ENDS:
+      commands[0] = (count > 0 ?
+          TextEditCommandX11::DELETE_WORD_FORWARD :
+          TextEditCommandX11::DELETE_WORD_BACKWARD);
+      break;
+    case GTK_DELETE_WORDS:
+      if (count > 0) {
+        commands[0] = TextEditCommandX11::MOVE_WORD_FORWARD;
+        commands[1] = TextEditCommandX11::DELETE_WORD_BACKWARD;
+      } else {
+        commands[0] = TextEditCommandX11::MOVE_WORD_BACKWARD;
+        commands[1] = TextEditCommandX11::DELETE_WORD_FORWARD;
+      }
+      break;
+    case GTK_DELETE_DISPLAY_LINES:
+      commands[0] = TextEditCommandX11::MOVE_TO_BEGINING_OF_LINE;
+      commands[1] = TextEditCommandX11::DELETE_TO_END_OF_LINE;
+      break;
+    case GTK_DELETE_DISPLAY_LINE_ENDS:
+      commands[0] = (count > 0 ?
+          TextEditCommandX11::DELETE_TO_END_OF_LINE :
+          TextEditCommandX11::DELETE_TO_BEGINING_OF_LINE);
+      break;
+    case GTK_DELETE_PARAGRAPH_ENDS:
+      commands[0] = (count > 0 ?
+          TextEditCommandX11::DELETE_TO_END_OF_PARAGRAPH :
+          TextEditCommandX11::DELETE_TO_BEGINING_OF_PARAGRAPH);
+      break;
+    case GTK_DELETE_PARAGRAPHS:
+      commands[0] =
+          TextEditCommandX11::MOVE_TO_BEGINING_OF_PARAGRAPH;
+      commands[1] =
+          TextEditCommandX11::DELETE_TO_END_OF_PARAGRAPH;
+      break;
+    default:
+      // GTK_DELETE_WHITESPACE has no corresponding editor command.
+      return;
+  }
+
+  Gtk2KeyBindingsHandler* owner = GetHandlerOwner(text_view);
+  if (count < 0)
+    count = -count;
+  for (; count > 0; --count) {
+    for (size_t i = 0; i < arraysize(commands); ++i)
+      if (commands[i] != TextEditCommandX11::INVALID_COMMAND)
+        owner->EditCommandMatched(commands[i], std::string(), false);
+  }
+}
+
+void Gtk2KeyBindingsHandler::InsertAtCursor(GtkTextView* text_view,
+                                            const gchar* str) {
+  if (str && *str)
+    GetHandlerOwner(text_view)->EditCommandMatched(
+        TextEditCommandX11::INSERT_TEXT, str, false);
+}
+
+void Gtk2KeyBindingsHandler::MoveCursor(
+    GtkTextView* text_view, GtkMovementStep step, gint count,
+    gboolean extend_selection) {
+  if (!count)
+    return;
+
+  TextEditCommandX11::CommandId command;
+  switch (step) {
+    case GTK_MOVEMENT_LOGICAL_POSITIONS:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_FORWARD :
+                 TextEditCommandX11::MOVE_BACKWARD);
+      break;
+    case GTK_MOVEMENT_VISUAL_POSITIONS:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_RIGHT :
+                 TextEditCommandX11::MOVE_LEFT);
+      break;
+    case GTK_MOVEMENT_WORDS:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_WORD_RIGHT :
+                 TextEditCommandX11::MOVE_WORD_LEFT);
+      break;
+    case GTK_MOVEMENT_DISPLAY_LINES:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_DOWN : TextEditCommandX11::MOVE_UP);
+      break;
+    case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_TO_END_OF_LINE :
+                 TextEditCommandX11::MOVE_TO_BEGINING_OF_LINE);
+      break;
+    case GTK_MOVEMENT_PARAGRAPH_ENDS:
+      command = (count > 0 ?
+                 TextEditCommandX11::MOVE_TO_END_OF_PARAGRAPH :
+                 TextEditCommandX11::MOVE_TO_BEGINING_OF_PARAGRAPH);
+      break;
+    case GTK_MOVEMENT_PAGES:
+      command = (count > 0 ? TextEditCommandX11::MOVE_PAGE_DOWN :
+                 TextEditCommandX11::MOVE_PAGE_UP);
+      break;
+    case GTK_MOVEMENT_BUFFER_ENDS:
+      command = (count > 0 ? TextEditCommandX11::MOVE_TO_END_OF_DOCUMENT :
+                 TextEditCommandX11::MOVE_TO_BEGINING_OF_PARAGRAPH);
+      break;
+    default:
+      // GTK_MOVEMENT_PARAGRAPHS and GTK_MOVEMENT_HORIZONTAL_PAGES have
+      // no corresponding editor commands.
+      return;
+  }
+
+  Gtk2KeyBindingsHandler* owner = GetHandlerOwner(text_view);
+  if (count < 0)
+    count = -count;
+  for (; count > 0; --count)
+    owner->EditCommandMatched(command, std::string(), extend_selection);
+}
+
+void Gtk2KeyBindingsHandler::MoveViewport(
+    GtkTextView* text_view, GtkScrollStep step, gint count) {
+  // Not supported by webkit.
+}
+
+void Gtk2KeyBindingsHandler::PasteClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched(
+      TextEditCommandX11::PASTE, std::string(), false);
+}
+
+void Gtk2KeyBindingsHandler::SelectAll(GtkTextView* text_view,
+                                       gboolean select) {
+  if (select) {
+    GetHandlerOwner(text_view)->EditCommandMatched(
+        TextEditCommandX11::SELECT_ALL, std::string(), false);
+  } else {
+    GetHandlerOwner(text_view)->EditCommandMatched(
+        TextEditCommandX11::UNSELECT, std::string(), false);
+  }
+}
+
+void Gtk2KeyBindingsHandler::SetAnchor(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched(
+      TextEditCommandX11::SET_MARK, std::string(), false);
+}
+
+void Gtk2KeyBindingsHandler::ToggleCursorVisible(GtkTextView* text_view) {
+  // Not supported by webkit.
+}
+
+void Gtk2KeyBindingsHandler::ToggleOverwrite(GtkTextView* text_view) {
+  // Not supported by webkit.
+}
+
+gboolean Gtk2KeyBindingsHandler::ShowHelp(GtkWidget* widget,
+                                          GtkWidgetHelpType arg1) {
+  // Just for disabling the default handler.
+  return FALSE;
+}
+
+void Gtk2KeyBindingsHandler::MoveFocus(GtkWidget* widget,
+                                       GtkDirectionType arg1) {
+  // Just for disabling the default handler.
+}
+
+}  // namespace libgtk2ui