Supports Gtk keyboard themes....

chrome/browser/renderer_host/gtk_key_bindings_handler.cc

+// Copyright (c) 2009 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/renderer_host/gtk_key_bindings_handler.h"
+
+#include <gdk/gdkkeysyms.h>
+
+#include <string>
+
+#include "base/logging.h"
+#include "base/string_util.h"
+#include "chrome/common/native_web_keyboard_event.h"
+
+GtkKeyBindingsHandler::GtkKeyBindingsHandler(GtkWidget* parent_widget)
+    : handler_(CreateNewHandler()),
+      edit_commands_(NULL),
+      enabled_(false) {
+  DCHECK(GTK_IS_FIXED(parent_widget));
+  // We need add the |handler_| object into gtk widget hierarchy, so that
+  // gtk_bindings_activate_event() can find correct display and keymaps from
+  // the |handler_| object.
+  gtk_fixed_put(GTK_FIXED(parent_widget), handler_.get(), -1, -1);
+}
+
+GtkKeyBindingsHandler::~GtkKeyBindingsHandler() {
+  handler_.Destroy();
+}
+
+bool GtkKeyBindingsHandler::Match(const NativeWebKeyboardEvent& wke,
+                                  EditCommands* edit_commands) {
+  if (!enabled_ || wke.type == WebKit::WebInputEvent::Char ||
+      !wke.os_event || wke.os_event->keyval == GDK_VoidSymbol)
+    return false;
+
+  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()), wke.os_event);
+
+  bool matched = !edit_commands_.empty();
+  if (edit_commands)
+    edit_commands->swap(edit_commands_);
+  return matched;
+}
+
+GtkWidget* GtkKeyBindingsHandler::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_UNSET_FLAGS(GTK_WIDGET(handler), GTK_CAN_FOCUS);
+
+#if !GTK_CHECK_VERSION(2, 14, 0)
+  // "move-viewport", "select-all" and "toggle-cursor-visible" have no
+  // corresponding virtual methods. Prior to glib 2.18 (gtk 2.14), there is no
+  // way to override the default class handler of a signal. So we need hook
+  // these signal explicitly.
+  g_signal_connect(handler, "move-viewport", G_CALLBACK(MoveViewport), NULL);
+  g_signal_connect(handler, "select-all", G_CALLBACK(SelectAll), NULL);
+  g_signal_connect(handler, "toggle-cursor-visible",
+                   G_CALLBACK(ToggleCursorVisible), NULL);
+#endif
+  return GTK_WIDGET(handler);
+}
+
+void GtkKeyBindingsHandler::EditCommandMatched(
+    const std::string& name, const std::string& value) {
+  edit_commands_.push_back(EditCommand(name, value));
+}
+
+void GtkKeyBindingsHandler::HandlerInit(Handler *self) {
+  self->owner = NULL;
+}
+
+void GtkKeyBindingsHandler::HandlerClassInit(HandlerClass *klass) {
+  GtkTextViewClass* text_view_class = GTK_TEXT_VIEW_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;
+
+#if GTK_CHECK_VERSION(2, 14, 0)
+  // "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-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));
+#endif
+}
+
+GType GtkKeyBindingsHandler::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("GtkKeyBindingsHandler"),
+        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;
+}
+
+GtkKeyBindingsHandler* GtkKeyBindingsHandler::GetHandlerOwner(
+    GtkTextView* text_view) {
+  Handler* handler = G_TYPE_CHECK_INSTANCE_CAST(
+      text_view, HandlerGetType(), Handler);
+  DCHECK(handler);
+  return handler->owner;
+}
+
+void GtkKeyBindingsHandler::BackSpace(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched("DeleteBackward", "");
+}
+
+void GtkKeyBindingsHandler::CopyClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched("Copy", "");
+}
+
+void GtkKeyBindingsHandler::CutClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched("Cut", "");
+}
+
+void GtkKeyBindingsHandler::DeleteFromCursor(
+    GtkTextView* text_view, GtkDeleteType type, gint count) {
+  if (!count)
+    return;
+
+  const char *commands[3] = { NULL, NULL, NULL };
+  switch (type) {
+    case GTK_DELETE_CHARS:
+      commands[0] = (count > 0 ? "DeleteForward" : "DeleteBackward");
+      break;
+    case GTK_DELETE_WORD_ENDS:
+      commands[0] = (count > 0 ? "DeleteWordForward" : "DeleteWordBackward");
+      break;
+    case GTK_DELETE_WORDS:
+      if (count > 0) {
+        commands[0] = "MoveWordForward";
+        commands[1] = "DeleteWordBackward";
+      } else {
+        commands[0] = "MoveWordBackward";
+        commands[1] = "DeleteWordForward";
+      }
+      break;
+    case GTK_DELETE_DISPLAY_LINES:
+      commands[0] = "MoveToBeginningOfLine";
+      commands[1] = "DeleteToEndOfLine";
+      break;
+    case GTK_DELETE_DISPLAY_LINE_ENDS:
+      commands[0] = (count > 0 ? "DeleteToEndOfLine" :
+                     "DeleteToBeginningOfLine");
+      break;
+    case GTK_DELETE_PARAGRAPH_ENDS:
+      commands[0] = (count > 0 ? "DeleteToEndOfParagraph" :
+                     "DeleteToBeginningOfParagraph");
+      break;
+    case GTK_DELETE_PARAGRAPHS:
+      commands[0] = "MoveToBeginningOfParagraph";
+      commands[1] = "DeleteToEndOfParagraph";
+      break;
+    default:
+      // GTK_DELETE_WHITESPACE has no corresponding editor command.
+      return;
+  }
+
+  GtkKeyBindingsHandler* owner = GetHandlerOwner(text_view);
+  if (count < 0)
+    count = -count;
+  for (; count > 0; --count) {
+    for (const char* const* p = commands; *p; ++p)
+      owner->EditCommandMatched(*p, "");
+  }
+}
+
+void GtkKeyBindingsHandler::InsertAtCursor(GtkTextView* text_view,
+                                           const gchar* str) {
+  if (str && *str)
+    GetHandlerOwner(text_view)->EditCommandMatched("InsertText", str);
+}
+
+void GtkKeyBindingsHandler::MoveCursor(
+    GtkTextView* text_view, GtkMovementStep step, gint count,
+    gboolean extend_selection) {
+  if (!count)
+    return;
+
+  std::string command;
+  switch (step) {
+    case GTK_MOVEMENT_LOGICAL_POSITIONS:
+      command = (count > 0 ? "MoveForward" : "MoveBackward");
+      break;
+    case GTK_MOVEMENT_VISUAL_POSITIONS:
+      command = (count > 0 ? "MoveRight" : "MoveLeft");
+      break;
+    case GTK_MOVEMENT_WORDS:
+      command = (count > 0 ? "MoveWordForward" : "MoveWordBackward");
+      break;
+    case GTK_MOVEMENT_DISPLAY_LINES:
+      command = (count > 0 ? "MoveDown" : "MoveUp");
+      break;
+    case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
+      command = (count > 0 ? "MoveToEndOfLine" : "MoveToBeginningOfLine");
+      break;
+    case GTK_MOVEMENT_PARAGRAPH_ENDS:
+      command = (count > 0 ? "MoveToEndOfParagraph" :
+                 "MoveToBeginningOfParagraph");
+      break;
+    case GTK_MOVEMENT_PAGES:
+      command = (count > 0 ? "MovePageDown" : "MovePageUp");
+      break;
+    case GTK_MOVEMENT_BUFFER_ENDS:
+      command = (count > 0 ? "MoveToEndOfDocument" :
+                 "MoveToBeginningOfDocument");
+      break;
+    default:
+      // GTK_MOVEMENT_PARAGRAPHS and GTK_MOVEMENT_HORIZONTAL_PAGES have
+      // no corresponding editor commands.
+      return;
+  }
+
+  GtkKeyBindingsHandler* owner = GetHandlerOwner(text_view);
+  if (extend_selection)
+    command.append("AndModifySelection");
+  if (count < 0)
+    count = -count;
+  for (; count > 0; --count)
+    owner->EditCommandMatched(command, "");
+}
+
+void GtkKeyBindingsHandler::MoveViewport(
+    GtkTextView* text_view, GtkScrollStep step, gint count) {
+  // Not supported by webkit.
+#if !GTK_CHECK_VERSION(2, 14, 0)
+  // Before gtk 2.14.0, there is no way to override a non-virtual default signal
+  // handler, so we need stop the signal emission explicitly to prevent the
+  // default handler from being executed.
+  g_signal_stop_emission_by_name(text_view, "move-viewport");
+#endif
+}
+
+void GtkKeyBindingsHandler::PasteClipboard(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched("Paste", "");
+}
+
+void GtkKeyBindingsHandler::SelectAll(GtkTextView* text_view, gboolean select) {
+  if (select)
+    GetHandlerOwner(text_view)->EditCommandMatched("SelectAll", "");
+  else
+    GetHandlerOwner(text_view)->EditCommandMatched("Unselect", "");
+#if !GTK_CHECK_VERSION(2, 14, 0)
+  // Before gtk 2.14.0, there is no way to override a non-virtual default signal
+  // handler, so we need stop the signal emission explicitly to prevent the
+  // default handler from being executed.
+  g_signal_stop_emission_by_name(text_view, "select-all");
+#endif
+}
+
+void GtkKeyBindingsHandler::SetAnchor(GtkTextView* text_view) {
+  GetHandlerOwner(text_view)->EditCommandMatched("SetMark", "");
+}
+
+void GtkKeyBindingsHandler::ToggleCursorVisible(GtkTextView* text_view) {
+  // Not supported by webkit.
+#if !GTK_CHECK_VERSION(2, 14, 0)
+  // Before gtk 2.14.0, there is no way to override a non-virtual default signal
+  // handler, so we need stop the signal emission explicitly to prevent the
+  // default handler from being executed.
+  g_signal_stop_emission_by_name(text_view, "toggle-cursor-visible");
+#endif
+}
+
+void GtkKeyBindingsHandler::ToggleOverwrite(GtkTextView* text_view) {
+  // Not supported by webkit.
+}