Removing deprecated GTK-Views code.

ui/views/widget/native_widget_gtk.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 "ui/views/widget/native_widget_gtk.h"
-
-#include <X11/Xatom.h>
-#include <X11/Xlib.h>
-#include <X11/extensions/shape.h>
-#include <gdk/gdk.h>
-#include <gdk/gdkx.h>
-
-#include <set>
-#include <vector>
-
-#include "base/auto_reset.h"
-#include "base/bind.h"
-#include "base/compiler_specific.h"
-#include "base/message_loop.h"
-#include "base/utf_string_conversions.h"
-#include "ui/base/dragdrop/drag_drop_types.h"
-#include "ui/base/dragdrop/os_exchange_data.h"
-#include "ui/base/dragdrop/os_exchange_data_provider_gtk.h"
-#include "ui/base/gtk/g_object_destructor_filo.h"
-#include "ui/base/gtk/gtk_signal_registrar.h"
-#include "ui/base/gtk/gtk_windowing.h"
-#include "ui/base/gtk/scoped_region.h"
-#include "ui/base/hit_test.h"
-#include "ui/base/x/active_window_watcher_x.h"
-#include "ui/base/x/x11_util.h"
-#include "ui/gfx/canvas_skia_paint.h"
-#include "ui/gfx/gtk_util.h"
-#include "ui/gfx/path.h"
-#include "ui/gfx/screen.h"
-#include "ui/views/bubble/bubble_delegate.h"
-#include "ui/views/controls/textfield/native_textfield_views.h"
-#include "ui/views/focus/view_storage.h"
-#include "ui/views/ime/input_method_gtk.h"
-#include "ui/views/views_delegate.h"
-#include "ui/views/widget/drop_target_gtk.h"
-#include "ui/views/widget/gtk_views_fixed.h"
-#include "ui/views/widget/gtk_views_window.h"
-#include "ui/views/widget/root_view.h"
-#include "ui/views/widget/tooltip_manager_gtk.h"
-#include "ui/views/widget/widget_delegate.h"
-
-using ui::OSExchangeData;
-using ui::OSExchangeDataProviderGtk;
-using ui::ActiveWindowWatcherX;
-
-namespace views {
-
-namespace {
-
-// Links the GtkWidget to its NativeWidget.
-const char* const kNativeWidgetKey = "__VIEWS_NATIVE_WIDGET__";
-
-// A g_object data key to associate a CompositePainter object to a GtkWidget.
-const char* kCompositePainterKey = "__VIEWS_COMPOSITE_PAINTER__";
-
-// A g_object data key to associate the flag whether or not the widget
-// is composited to a GtkWidget. gtk_widget_is_composited simply tells
-// if x11 supports composition and cannot be used to tell if given widget
-// is composited.
-const char* kCompositeEnabledKey = "__VIEWS_COMPOSITE_ENABLED__";
-
-// A g_object data key to associate the expose handler id that is
-// used to remove FREEZE_UPDATE property on the window.
-const char* kExposeHandlerIdKey = "__VIEWS_EXPOSE_HANDLER_ID__";
-
-// CompositePainter draws a composited child widgets image into its
-// drawing area. This object is created at most once for a widget and kept
-// until the widget is destroyed.
-class CompositePainter {
- public:
-  explicit CompositePainter(GtkWidget* parent)
-      : parent_object_(G_OBJECT(parent)) {
-    handler_id_ = g_signal_connect_after(
-        parent_object_, "expose_event", G_CALLBACK(OnCompositePaint), NULL);
-  }
-
-  static void AddCompositePainter(GtkWidget* widget) {
-    CompositePainter* painter = static_cast<CompositePainter*>(
-        g_object_get_data(G_OBJECT(widget), kCompositePainterKey));
-    if (!painter) {
-      g_object_set_data(G_OBJECT(widget), kCompositePainterKey,
-                        new CompositePainter(widget));
-      g_signal_connect(widget, "destroy",
-                       G_CALLBACK(&DestroyPainter), NULL);
-    }
-  }
-
-  // Set the composition flag.
-  static void SetComposited(GtkWidget* widget) {
-    g_object_set_data(G_OBJECT(widget), kCompositeEnabledKey,
-                      const_cast<char*>(""));
-  }
-
-  // Returns true if the |widget| is composited and ready to be drawn.
-  static bool IsComposited(GtkWidget* widget) {
-    return g_object_get_data(G_OBJECT(widget), kCompositeEnabledKey) != NULL;
-  }
-
- private:
-  virtual ~CompositePainter() {}
-
-  // Composes a image from one child.
-  static void CompositeChildWidget(GtkWidget* child, gpointer data) {
-    GdkEventExpose* event = static_cast<GdkEventExpose*>(data);
-    GtkWidget* parent = gtk_widget_get_parent(child);
-    DCHECK(parent);
-    if (IsComposited(child)) {
-      cairo_t* cr = gdk_cairo_create(parent->window);
-      gdk_cairo_set_source_pixmap(cr, child->window,
-                                  child->allocation.x,
-                                  child->allocation.y);
-      GdkRegion* region = gdk_region_rectangle(&child->allocation);
-      gdk_region_intersect(region, event->region);
-      gdk_cairo_region(cr, region);
-      cairo_clip(cr);
-      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-      cairo_paint(cr);
-      cairo_destroy(cr);
-    }
-  }
-
-  // Expose-event handler that compose & draws children's image into
-  // the |parent|'s drawing area.
-  static gboolean OnCompositePaint(GtkWidget* parent, GdkEventExpose* event) {
-    gtk_container_foreach(GTK_CONTAINER(parent),
-                          CompositeChildWidget,
-                          event);
-    return false;
-  }
-
-  static void DestroyPainter(GtkWidget* object) {
-    CompositePainter* painter = reinterpret_cast<CompositePainter*>(
-        g_object_get_data(G_OBJECT(object), kCompositePainterKey));
-    DCHECK(painter);
-    delete painter;
-  }
-
-  GObject* parent_object_;
-  gulong handler_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(CompositePainter);
-};
-
-void EnumerateChildWidgetsForNativeWidgets(GtkWidget* child_widget,
-                                           gpointer param) {
-  // Walk child widgets, if necessary.
-  if (GTK_IS_CONTAINER(child_widget)) {
-    gtk_container_foreach(GTK_CONTAINER(child_widget),
-                          EnumerateChildWidgetsForNativeWidgets,
-                          param);
-  }
-
-  Widget* widget = Widget::GetWidgetForNativeView(child_widget);
-  if (widget) {
-    Widget::Widgets* widgets = reinterpret_cast<Widget::Widgets*>(param);
-    widgets->insert(widget);
-  }
-}
-
-GtkWindowType WindowTypeToGtkWindowType(Widget::InitParams::Type type) {
-  switch (type) {
-    case Widget::InitParams::TYPE_BUBBLE:
-    case Widget::InitParams::TYPE_WINDOW:
-    case Widget::InitParams::TYPE_PANEL:
-    case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
-      return GTK_WINDOW_TOPLEVEL;
-    default:
-      return GTK_WINDOW_POPUP;
-  }
-  NOTREACHED();
-  return GTK_WINDOW_TOPLEVEL;
-}
-
-// Converts a Windows-style hit test result code into a GDK window edge.
-GdkWindowEdge HitTestCodeToGDKWindowEdge(int hittest_code) {
-  switch (hittest_code) {
-    case HTBOTTOM:
-      return GDK_WINDOW_EDGE_SOUTH;
-    case HTBOTTOMLEFT:
-      return GDK_WINDOW_EDGE_SOUTH_WEST;
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-      return GDK_WINDOW_EDGE_SOUTH_EAST;
-    case HTLEFT:
-      return GDK_WINDOW_EDGE_WEST;
-    case HTRIGHT:
-      return GDK_WINDOW_EDGE_EAST;
-    case HTTOP:
-      return GDK_WINDOW_EDGE_NORTH;
-    case HTTOPLEFT:
-      return GDK_WINDOW_EDGE_NORTH_WEST;
-    case HTTOPRIGHT:
-      return GDK_WINDOW_EDGE_NORTH_EAST;
-    default:
-      NOTREACHED();
-      break;
-  }
-  // Default to something defaultish.
-  return HitTestCodeToGDKWindowEdge(HTGROWBOX);
-}
-
-// Converts a Windows-style hit test result code into a GDK cursor type.
-GdkCursorType HitTestCodeToGdkCursorType(int hittest_code) {
-  switch (hittest_code) {
-    case HTBOTTOM:
-      return GDK_BOTTOM_SIDE;
-    case HTBOTTOMLEFT:
-      return GDK_BOTTOM_LEFT_CORNER;
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-      return GDK_BOTTOM_RIGHT_CORNER;
-    case HTLEFT:
-      return GDK_LEFT_SIDE;
-    case HTRIGHT:
-      return GDK_RIGHT_SIDE;
-    case HTTOP:
-      return GDK_TOP_SIDE;
-    case HTTOPLEFT:
-      return GDK_TOP_LEFT_CORNER;
-    case HTTOPRIGHT:
-      return GDK_TOP_RIGHT_CORNER;
-    default:
-      break;
-  }
-  // Default to something defaultish.
-  return GDK_LEFT_PTR;
-}
-
-}  // namespace
-
-// During drag and drop GTK sends a drag-leave during a drop. This means we
-// have no way to tell the difference between a normal drag leave and a drop.
-// To work around that we listen for DROP_START, then ignore the subsequent
-// drag-leave that GTK generates.
-class NativeWidgetGtk::DropObserver : public MessageLoopForUI::Observer {
- public:
-  DropObserver() {}
-
-  static DropObserver* GetInstance() {
-    return Singleton<DropObserver>::get();
-  }
-
-  virtual void WillProcessEvent(GdkEvent* event) {
-    if (event->type == GDK_DROP_START) {
-      NativeWidgetGtk* widget = GetNativeWidgetGtkForEvent(event);
-      if (widget)
-        widget->ignore_drag_leave_ = true;
-    }
-  }
-
-  virtual void DidProcessEvent(GdkEvent* event) {
-  }
-
- private:
-  NativeWidgetGtk* GetNativeWidgetGtkForEvent(GdkEvent* event) {
-    GtkWidget* gtk_widget = gtk_get_event_widget(event);
-    if (!gtk_widget)
-      return NULL;
-
-    return static_cast<NativeWidgetGtk*>(
-        internal::NativeWidgetPrivate::GetNativeWidgetForNativeView(
-            gtk_widget));
-  }
-
-  DISALLOW_COPY_AND_ASSIGN(DropObserver);
-};
-
-// Returns the position of a widget on screen.
-static void GetWidgetPositionOnScreen(GtkWidget* widget, int* x, int *y) {
-  // First get the root window.
-  GtkWidget* root = widget;
-  while (root && !GTK_IS_WINDOW(root)) {
-    root = gtk_widget_get_parent(root);
-  }
-  if (!root) {
-    // If root is null we're not parented. Return 0x0 and assume the caller will
-    // query again when we're parented.
-    *x = *y = 0;
-    return;
-  }
-  // Translate the coordinate from widget to root window.
-  gtk_widget_translate_coordinates(widget, root, 0, 0, x, y);
-  // Then adjust the position with the position of the root window.
-  int window_x, window_y;
-  gtk_window_get_position(GTK_WINDOW(root), &window_x, &window_y);
-  *x += window_x;
-  *y += window_y;
-}
-
-// "expose-event" handler of drag icon widget that renders drag image pixbuf.
-static gboolean DragIconWidgetPaint(GtkWidget* widget,
-                                    GdkEventExpose* event,
-                                    gpointer data) {
-  GdkPixbuf* pixbuf = reinterpret_cast<GdkPixbuf*>(data);
-
-  cairo_t* cr = gdk_cairo_create(widget->window);
-
-  gdk_cairo_region(cr, event->region);
-  cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-  gdk_cairo_set_source_pixbuf(cr, pixbuf, 0.0, 0.0);
-  cairo_paint(cr);
-
-  cairo_destroy(cr);
-  return true;
-}
-
-// Creates a drag icon widget that draws drag_image.
-static GtkWidget* CreateDragIconWidget(GdkPixbuf* drag_image) {
-  GdkColormap* rgba_colormap =
-      gdk_screen_get_rgba_colormap(gdk_screen_get_default());
-  if (!rgba_colormap)
-    return NULL;
-
-  GtkWidget* drag_widget = gtk_window_new(GTK_WINDOW_POPUP);
-
-  gtk_widget_set_colormap(drag_widget, rgba_colormap);
-  gtk_widget_set_app_paintable(drag_widget, true);
-  gtk_widget_set_size_request(drag_widget,
-                              gdk_pixbuf_get_width(drag_image),
-                              gdk_pixbuf_get_height(drag_image));
-
-  g_signal_connect(G_OBJECT(drag_widget), "expose-event",
-                   G_CALLBACK(&DragIconWidgetPaint), drag_image);
-  return drag_widget;
-}
-
-// static
-GtkWidget* NativeWidgetGtk::null_parent_ = NULL;
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk, public:
-
-NativeWidgetGtk::NativeWidgetGtk(internal::NativeWidgetDelegate* delegate)
-    : delegate_(delegate),
-      widget_(NULL),
-      window_contents_(NULL),
-      child_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(close_widget_factory_(this)),
-      ownership_(Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET),
-      transparent_(false),
-      ignore_events_(false),
-      ignore_drag_leave_(false),
-      opacity_(255),
-      drag_data_(NULL),
-      window_state_(GDK_WINDOW_STATE_WITHDRAWN),
-      is_active_(false),
-      transient_to_parent_(false),
-      got_initial_focus_in_(false),
-      has_focus_(false),
-      always_on_top_(false),
-      is_double_buffered_(false),
-      dragged_view_(NULL),
-      painted_(false),
-      has_pointer_grab_(false),
-      has_keyboard_grab_(false),
-      grab_notify_signal_id_(0),
-      is_menu_(false),
-      signal_registrar_(new ui::GtkSignalRegistrar),
-      destroy_signal_registrar_(new ui::GtkSignalRegistrar) {
-  static bool installed_message_loop_observer = false;
-  if (!installed_message_loop_observer) {
-    installed_message_loop_observer = true;
-    MessageLoopForUI* loop = MessageLoopForUI::current();
-    if (loop)
-      loop->AddObserver(DropObserver::GetInstance());
-  }
-}
-
-NativeWidgetGtk::~NativeWidgetGtk() {
-  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET) {
-    DCHECK(widget_ == NULL);
-    delete delegate_;
-  } else {
-    bool has_widget = !!widget_;
-    if (has_widget) {
-      // Disconnect all signal handlers registered with this object,
-      // except one for "destroy", before deleting the NativeWidgetGtk.
-      ui::GObjectDestructorFILO::GetInstance()->Disconnect(
-          G_OBJECT(widget_), &OnDestroyedThunk, this);
-      signal_registrar_.reset();
-    }
-    CloseNow();
-    // If gtk_widget_destroy didn't fire destroy signal for whatever reason,
-    // fail in debug build and call OnDestroy() for release build.
-    DCHECK(!widget_);
-    if (widget_)
-      OnDestroy(widget_);
-    // Call OnNativeWidgetDestroyed because we're not calling
-    // OnDestroyedThunk
-    if (has_widget)
-      delegate_->OnNativeWidgetDestroyed();
-  }
-}
-
-GtkWindow* NativeWidgetGtk::GetTransientParent() const {
-  return (!child_ && widget_) ?
-      gtk_window_get_transient_for(GTK_WINDOW(widget_)) : NULL;
-}
-
-bool NativeWidgetGtk::MakeTransparent() {
-  // Transparency can only be enabled only if we haven't realized the widget.
-  DCHECK(!widget_);
-
-  if (!gdk_screen_is_composited(gdk_screen_get_default())) {
-    // Transparency is only supported for compositing window managers.
-    // NOTE: there's a race during ChromeOS startup such that X might think
-    // compositing isn't supported. We ignore it if the wm says compositing
-    // isn't supported.
-    DLOG(WARNING) << "compositing not supported; allowing anyway";
-  }
-
-  if (!gdk_screen_get_rgba_colormap(gdk_screen_get_default())) {
-    // We need rgba to make the window transparent.
-    return false;
-  }
-
-  transparent_ = true;
-  return true;
-}
-
-void NativeWidgetGtk::EnableDoubleBuffer(bool enabled) {
-  is_double_buffered_ = enabled;
-  if (window_contents_) {
-    if (is_double_buffered_)
-      GTK_WIDGET_SET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
-    else
-      GTK_WIDGET_UNSET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
-  }
-}
-
-void NativeWidgetGtk::AddChild(GtkWidget* child) {
-  gtk_container_add(GTK_CONTAINER(window_contents_), child);
-}
-
-void NativeWidgetGtk::RemoveChild(GtkWidget* child) {
-  // We can be called after the contents widget has been destroyed, e.g. any
-  // NativeViewHost not removed from the view hierarchy before the window is
-  // closed.
-  if (GTK_IS_CONTAINER(window_contents_)) {
-    gtk_container_remove(GTK_CONTAINER(window_contents_), child);
-    gtk_views_fixed_set_widget_size(child, 0, 0);
-  }
-}
-
-void NativeWidgetGtk::ReparentChild(GtkWidget* child) {
-  gtk_widget_reparent(child, window_contents_);
-}
-
-void NativeWidgetGtk::PositionChild(GtkWidget* child, int x, int y, int w,
-                                    int h) {
-  gtk_views_fixed_set_widget_size(child, w, h);
-  gtk_fixed_move(GTK_FIXED(window_contents_), child, x, y);
-}
-
-void NativeWidgetGtk::DoDrag(const OSExchangeData& data, int operation) {
-  const OSExchangeDataProviderGtk& data_provider =
-      static_cast<const OSExchangeDataProviderGtk&>(data.provider());
-  GtkTargetList* targets = data_provider.GetTargetList();
-  GdkEvent* current_event = gtk_get_current_event();
-  const OSExchangeDataProviderGtk& provider(
-      static_cast<const OSExchangeDataProviderGtk&>(data.provider()));
-
-  GdkDragContext* context = gtk_drag_begin(
-      window_contents_,
-      targets,
-      static_cast<GdkDragAction>(
-          ui::DragDropTypes::DragOperationToGdkDragAction(operation)),
-      1,
-      current_event);
-
-  GtkWidget* drag_icon_widget = NULL;
-
-  // Set the drag image if one was supplied.
-  if (provider.drag_image()) {
-    drag_icon_widget = CreateDragIconWidget(provider.drag_image());
-    if (drag_icon_widget) {
-      // Use a widget as the drag icon when compositing is enabled for proper
-      // transparency handling.
-      g_object_ref(provider.drag_image());
-      gtk_drag_set_icon_widget(context,
-                               drag_icon_widget,
-                               provider.cursor_offset().x(),
-                               provider.cursor_offset().y());
-    } else {
-      gtk_drag_set_icon_pixbuf(context,
-                               provider.drag_image(),
-                               provider.cursor_offset().x(),
-                               provider.cursor_offset().y());
-    }
-  }
-
-  if (current_event)
-    gdk_event_free(current_event);
-  gtk_target_list_unref(targets);
-
-  drag_data_ = &data_provider;
-
-  // Block the caller until drag is done by running a nested message loop.
-  MessageLoopForUI::current()->RunWithDispatcher(NULL);
-
-  drag_data_ = NULL;
-
-  if (drag_icon_widget) {
-    gtk_widget_destroy(drag_icon_widget);
-    g_object_unref(provider.drag_image());
-  }
-}
-
-void NativeWidgetGtk::OnActiveChanged() {
-  delegate_->OnNativeWidgetActivationChanged(IsActive());
-}
-
-void NativeWidgetGtk::ResetDropTarget() {
-  ignore_drag_leave_ = false;
-  drop_target_.reset(NULL);
-}
-
-void NativeWidgetGtk::GetRequestedSize(gfx::Size* out) const {
-  int width, height;
-  if (GTK_IS_VIEWS_FIXED(widget_) &&
-      gtk_views_fixed_get_widget_size(GetNativeView(), &width, &height)) {
-    out->SetSize(width, height);
-  } else {
-    GtkRequisition requisition;
-    gtk_widget_get_child_requisition(GetNativeView(), &requisition);
-    out->SetSize(requisition.width, requisition.height);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk, ActiveWindowWatcherXObserver implementation:
-
-void NativeWidgetGtk::ActiveWindowChanged(GdkWindow* active_window) {
-  if (!GetNativeView())
-    return;
-
-  bool was_active = IsActive();
-  is_active_ = (active_window == GTK_WIDGET(GetNativeView())->window);
-  if (!is_active_ && active_window && !child_) {
-    // We're not active, but the force the window to be rendered as active if
-    // a child window is transient to us.
-    gpointer data = NULL;
-    gdk_window_get_user_data(active_window, &data);
-    GtkWidget* widget = reinterpret_cast<GtkWidget*>(data);
-    is_active_ =
-        (widget && GTK_IS_WINDOW(widget) &&
-         gtk_window_get_transient_for(GTK_WINDOW(widget)) == GTK_WINDOW(
-             widget_));
-  }
-  if (was_active != IsActive()) {
-    OnActiveChanged();
-    GetWidget()->GetRootView()->SchedulePaint();
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk implementation:
-
-bool NativeWidgetGtk::HandleKeyboardEvent(const KeyEvent& key) {
-  if (!GetWidget()->GetFocusManager())
-    return false;
-  // FocusManager::OnKeyEvent() returns false when the key has been consumed.
-  return !GetWidget()->GetFocusManager()->OnKeyEvent(key);
-}
-
-bool NativeWidgetGtk::SuppressFreezeUpdates() {
-  if (!painted_) {
-    painted_ = true;
-    return true;
-  }
-  return false;
-}
-
-// static
-void NativeWidgetGtk::UpdateFreezeUpdatesProperty(GtkWindow* window,
-                                                  bool enable) {
-  if (!GTK_WIDGET_REALIZED(GTK_WIDGET(window)))
-    gtk_widget_realize(GTK_WIDGET(window));
-  GdkWindow* gdk_window = GTK_WIDGET(window)->window;
-
-  static GdkAtom freeze_atom_ =
-      gdk_atom_intern("_CHROME_FREEZE_UPDATES", FALSE);
-  if (enable) {
-    VLOG(1) << "setting FREEZE UPDATES property. xid=" <<
-        GDK_WINDOW_XID(gdk_window);
-    int32 val = 1;
-    gdk_property_change(gdk_window,
-                        freeze_atom_,
-                        freeze_atom_,
-                        32,
-                        GDK_PROP_MODE_REPLACE,
-                        reinterpret_cast<const guchar*>(&val),
-                        1);
-  } else {
-    VLOG(1) << "deleting FREEZE UPDATES property. xid=" <<
-        GDK_WINDOW_XID(gdk_window);
-    gdk_property_delete(gdk_window, freeze_atom_);
-  }
-}
-
-// static
-void NativeWidgetGtk::RegisterChildExposeHandler(GtkWidget* child) {
-  UnregisterChildExposeHandler(child);
-  gulong id = g_signal_connect_after(child, "expose-event",
-                                     G_CALLBACK(&ChildExposeHandler), NULL);
-  g_object_set_data(G_OBJECT(child), kExposeHandlerIdKey,
-                    reinterpret_cast<void*>(id));
-}
-
-// static
-void NativeWidgetGtk::UnregisterChildExposeHandler(GtkWidget* child) {
-  gulong id = reinterpret_cast<gulong>(g_object_get_data(G_OBJECT(child),
-                                                         kExposeHandlerIdKey));
-  if (id) {
-    g_signal_handler_disconnect(G_OBJECT(child), id);
-    g_object_set_data(G_OBJECT(child), kExposeHandlerIdKey, 0);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk, NativeWidget implementation:
-
-void NativeWidgetGtk::InitNativeWidget(const Widget::InitParams& params) {
-  SetInitParams(params);
-
-  Widget::InitParams modified_params = params;
-  if (params.parent_widget) {
-    NativeWidgetGtk* parent_gtk =
-        static_cast<NativeWidgetGtk*>(params.parent_widget->native_widget());
-    modified_params.parent = child_ ? parent_gtk->window_contents()
-                                    : params.parent_widget->GetNativeView();
-  }
-
-  if (!child_)
-    ActiveWindowWatcherX::AddObserver(this);
-
-  // Make container here.
-  CreateGtkWidget(modified_params);
-
-  if (params.type == Widget::InitParams::TYPE_MENU) {
-    gtk_window_set_destroy_with_parent(GTK_WINDOW(GetNativeView()), TRUE);
-    gtk_window_set_type_hint(GTK_WINDOW(GetNativeView()),
-                             GDK_WINDOW_TYPE_HINT_MENU);
-  }
-
-  delegate_->OnNativeWidgetCreated();
-
-  if (opacity_ != 255)
-    SetOpacity(opacity_);
-
-  // Make sure we receive our motion events.
-
-  // In general we register most events on the parent of all widgets. At a
-  // minimum we need painting to happen on the parent (otherwise painting
-  // doesn't work at all), and similarly we need mouse release events on the
-  // parent as windows don't get mouse releases.
-  gtk_widget_add_events(window_contents_,
-                        GDK_ENTER_NOTIFY_MASK |
-                        GDK_LEAVE_NOTIFY_MASK |
-                        GDK_BUTTON_PRESS_MASK |
-                        GDK_BUTTON_RELEASE_MASK |
-                        GDK_POINTER_MOTION_MASK |
-                        GDK_KEY_PRESS_MASK |
-                        GDK_KEY_RELEASE_MASK);
-
-  signal_registrar_->ConnectAfter(G_OBJECT(window_contents_), "size_request",
-                                  G_CALLBACK(&OnSizeRequestThunk), this);
-  signal_registrar_->ConnectAfter(G_OBJECT(window_contents_), "size_allocate",
-                                  G_CALLBACK(&OnSizeAllocateThunk), this);
-  gtk_widget_set_app_paintable(window_contents_, true);
-  signal_registrar_->Connect(window_contents_, "expose_event",
-                             G_CALLBACK(&OnPaintThunk), this);
-  signal_registrar_->Connect(window_contents_, "enter_notify_event",
-                             G_CALLBACK(&OnEnterNotifyThunk), this);
-  signal_registrar_->Connect(window_contents_, "leave_notify_event",
-                             G_CALLBACK(&OnLeaveNotifyThunk), this);
-  signal_registrar_->Connect(window_contents_, "motion_notify_event",
-                             G_CALLBACK(&OnMotionNotifyThunk), this);
-  signal_registrar_->Connect(window_contents_, "button_press_event",
-                             G_CALLBACK(&OnButtonPressThunk), this);
-  signal_registrar_->Connect(window_contents_, "button_release_event",
-                             G_CALLBACK(&OnButtonReleaseThunk), this);
-  signal_registrar_->Connect(window_contents_, "grab_broken_event",
-                             G_CALLBACK(&OnGrabBrokeEventThunk), this);
-  signal_registrar_->Connect(window_contents_, "scroll_event",
-                             G_CALLBACK(&OnScrollThunk), this);
-  signal_registrar_->Connect(window_contents_, "visibility_notify_event",
-                             G_CALLBACK(&OnVisibilityNotifyThunk), this);
-
-  // In order to receive notification when the window is no longer the front
-  // window, we need to install these on the widget.
-  // NOTE: this doesn't work with focus follows mouse.
-  signal_registrar_->Connect(widget_, "focus_in_event",
-                             G_CALLBACK(&OnFocusInThunk), this);
-  signal_registrar_->Connect(widget_, "focus_out_event",
-                             G_CALLBACK(&OnFocusOutThunk), this);
-
-  // Use the dedicated registrar for destory so that other handlers
-  // can be unregistered first.
-  destroy_signal_registrar_->Connect(widget_, "destroy",
-                                     G_CALLBACK(&OnDestroyThunk), this);
-
-  signal_registrar_->Connect(widget_, "show",
-                             G_CALLBACK(&OnShowThunk), this);
-  signal_registrar_->Connect(widget_, "map",
-                             G_CALLBACK(&OnMapThunk), this);
-  signal_registrar_->Connect(widget_, "hide",
-                             G_CALLBACK(&OnHideThunk), this);
-  signal_registrar_->Connect(widget_, "configure-event",
-                             G_CALLBACK(&OnConfigureEventThunk), this);
-
-  // Views/FocusManager (re)sets the focus to the root window,
-  // so we need to connect signal handlers to the gtk window.
-  // See views::Views::Focus and views::FocusManager::ClearNativeFocus
-  // for more details.
-  signal_registrar_->Connect(widget_, "key_press_event",
-                             G_CALLBACK(&OnEventKeyThunk), this);
-  signal_registrar_->Connect(widget_, "key_release_event",
-                             G_CALLBACK(&OnEventKeyThunk), this);
-
-  // Drag and drop.
-  gtk_drag_dest_set(window_contents_, static_cast<GtkDestDefaults>(0),
-                    NULL, 0, GDK_ACTION_COPY);
-  signal_registrar_->Connect(window_contents_, "drag_motion",
-                             G_CALLBACK(&OnDragMotionThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_data_received",
-                             G_CALLBACK(&OnDragDataReceivedThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_drop",
-                             G_CALLBACK(&OnDragDropThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_leave",
-                             G_CALLBACK(&OnDragLeaveThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_data_get",
-                             G_CALLBACK(&OnDragDataGetThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_end",
-                             G_CALLBACK(&OnDragEndThunk), this);
-  signal_registrar_->Connect(window_contents_, "drag_failed",
-                             G_CALLBACK(&OnDragFailedThunk), this);
-  signal_registrar_->Connect(G_OBJECT(widget_), "window-state-event",
-                             G_CALLBACK(&OnWindowStateEventThunk), this);
-
-  ui::GObjectDestructorFILO::GetInstance()->Connect(
-      G_OBJECT(widget_), &OnDestroyedThunk, this);
-
-  tooltip_manager_.reset(new TooltipManagerGtk(this));
-
-  // Register for tooltips.
-  g_object_set(G_OBJECT(window_contents_), "has-tooltip", TRUE, NULL);
-  signal_registrar_->Connect(window_contents_, "query_tooltip",
-                             G_CALLBACK(&OnQueryTooltipThunk), this);
-
-  if (child_) {
-    if (modified_params.parent)
-      SetBounds(params.bounds);
-  } else {
-    gtk_widget_add_events(widget_,
-                          GDK_STRUCTURE_MASK);
-    if (params.bounds.width() > 0 && params.bounds.height() > 0)
-      gtk_window_resize(GTK_WINDOW(widget_), params.bounds.width(),
-                        params.bounds.height());
-    gtk_window_move(GTK_WINDOW(widget_), params.bounds.x(), params.bounds.y());
-  }
-}
-
-NonClientFrameView* NativeWidgetGtk::CreateNonClientFrameView() {
-  return NULL;
-}
-
-void NativeWidgetGtk::UpdateFrameAfterFrameChange() {
-  // We currently don't support different frame types on Gtk, so we don't
-  // need to implement this.
-  NOTIMPLEMENTED();
-}
-
-bool NativeWidgetGtk::ShouldUseNativeFrame() const {
-  return false;
-}
-
-void NativeWidgetGtk::FrameTypeChanged() {
-  // This is called when the Theme has changed, so forward the event to the root
-  // widget.
-  GetWidget()->ThemeChanged();
-  GetWidget()->GetRootView()->SchedulePaint();
-}
-
-Widget* NativeWidgetGtk::GetWidget() {
-  return delegate_->AsWidget();
-}
-
-const Widget* NativeWidgetGtk::GetWidget() const {
-  return delegate_->AsWidget();
-}
-
-gfx::NativeView NativeWidgetGtk::GetNativeView() const {
-  return widget_;
-}
-
-gfx::NativeWindow NativeWidgetGtk::GetNativeWindow() const {
-  return child_ ? NULL : GTK_WINDOW(widget_);
-}
-
-Widget* NativeWidgetGtk::GetTopLevelWidget() {
-  NativeWidgetPrivate* native_widget = GetTopLevelNativeWidget(GetNativeView());
-  return native_widget ? native_widget->GetWidget() : NULL;
-}
-
-const ui::Compositor* NativeWidgetGtk::GetCompositor() const {
-  return NULL;
-}
-
-ui::Compositor* NativeWidgetGtk::GetCompositor() {
-  return NULL;
-}
-
-void NativeWidgetGtk::CalculateOffsetToAncestorWithLayer(
-    gfx::Point* offset,
-    ui::Layer** layer_parent) {
-}
-
-void NativeWidgetGtk::ViewRemoved(View* view) {
-  if (drop_target_.get())
-    drop_target_->ResetTargetViewIfEquals(view);
-}
-
-void NativeWidgetGtk::SetNativeWindowProperty(const char* name, void* value) {
-  g_object_set_data(G_OBJECT(widget_), name, value);
-}
-
-void* NativeWidgetGtk::GetNativeWindowProperty(const char* name) const {
-  return g_object_get_data(G_OBJECT(widget_), name);
-}
-
-TooltipManager* NativeWidgetGtk::GetTooltipManager() const {
-  return tooltip_manager_.get();
-}
-
-bool NativeWidgetGtk::IsScreenReaderActive() const {
-  return false;
-}
-
-void NativeWidgetGtk::SendNativeAccessibilityEvent(
-    View* view,
-    ui::AccessibilityTypes::Event event_type) {
-  // In the future if we add native GTK accessibility support, the
-  // notification should be sent here.
-}
-
-void NativeWidgetGtk::SetMouseCapture() {
-  DCHECK(!HasMouseCapture());
-
-  // Release the current grab.
-  GtkWidget* current_grab_window = gtk_grab_get_current();
-  if (current_grab_window)
-    gtk_grab_remove(current_grab_window);
-
-  if (is_menu_ && gdk_pointer_is_grabbed())
-    gdk_pointer_ungrab(GDK_CURRENT_TIME);
-
-  // Make sure all app mouse/keyboard events are targeted at us only.
-  gtk_grab_add(window_contents_);
-  if (gtk_grab_get_current() == window_contents_ && !grab_notify_signal_id_) {
-    // "grab_notify" is sent any time the grab changes. We only care about grab
-    // changes when we have done a grab.
-    grab_notify_signal_id_ = g_signal_connect(
-        window_contents_, "grab_notify", G_CALLBACK(&OnGrabNotifyThunk), this);
-  }
-
-  if (is_menu_) {
-    // For menus we do a pointer grab too. This ensures we get mouse events from
-    // other apps. In theory we should do this for all widget types, but doing
-    // so leads to gdk_pointer_grab randomly returning GDK_GRAB_ALREADY_GRABBED.
-    GdkGrabStatus pointer_grab_status =
-        gdk_pointer_grab(window_contents()->window, FALSE,
-                         static_cast<GdkEventMask>(
-                             GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
-                             GDK_POINTER_MOTION_MASK),
-                         NULL, NULL, GDK_CURRENT_TIME);
-    // NOTE: technically grab may fail. We may want to try and continue on in
-    // that case.
-    DCHECK_EQ(GDK_GRAB_SUCCESS, pointer_grab_status);
-    has_pointer_grab_ = pointer_grab_status == GDK_GRAB_SUCCESS;
-  }
-}
-
-void NativeWidgetGtk::ReleaseMouseCapture() {
-  bool delegate_lost_capture = HasMouseCapture();
-  if (GTK_WIDGET_HAS_GRAB(window_contents_))
-    gtk_grab_remove(window_contents_);
-  if (grab_notify_signal_id_) {
-    g_signal_handler_disconnect(window_contents_, grab_notify_signal_id_);
-    grab_notify_signal_id_ = 0;
-  }
-  if (has_pointer_grab_) {
-    has_pointer_grab_ = false;
-    gdk_pointer_ungrab(GDK_CURRENT_TIME);
-  }
-  if (delegate_lost_capture)
-    delegate_->OnMouseCaptureLost();
-}
-
-bool NativeWidgetGtk::HasMouseCapture() const {
-  return GTK_WIDGET_HAS_GRAB(window_contents_) || has_pointer_grab_;
-}
-
-InputMethod* NativeWidgetGtk::CreateInputMethod() {
-  // Create input method when pure views is enabled but not on views desktop.
-  if (views::Widget::IsPureViews()) {
-    InputMethod* input_method = new InputMethodGtk(this);
-    input_method->Init(GetWidget());
-    return input_method;
-  }
-  // GTK's textfield will handle IME.
-  return NULL;
-}
-
-void NativeWidgetGtk::CenterWindow(const gfx::Size& size) {
-  gfx::Rect center_rect;
-
-  GtkWindow* parent = gtk_window_get_transient_for(GetNativeWindow());
-  if (parent) {
-    // We have a parent window, center over it.
-    gint parent_x = 0;
-    gint parent_y = 0;
-    gtk_window_get_position(parent, &parent_x, &parent_y);
-    gint parent_w = 0;
-    gint parent_h = 0;
-    gtk_window_get_size(parent, &parent_w, &parent_h);
-    center_rect = gfx::Rect(parent_x, parent_y, parent_w, parent_h);
-  } else {
-    // We have no parent window, center over the screen.
-    center_rect = gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
-  }
-  gfx::Rect bounds(center_rect.x() + (center_rect.width() - size.width()) / 2,
-                   center_rect.y() + (center_rect.height() - size.height()) / 2,
-                   size.width(), size.height());
-  GetWidget()->SetBoundsConstrained(bounds);
-}
-
-void NativeWidgetGtk::GetWindowPlacement(
-    gfx::Rect* bounds,
-    ui::WindowShowState* show_state) const {
-  // Do nothing for now. ChromeOS isn't yet saving window placement.
-}
-
-void NativeWidgetGtk::SetWindowTitle(const string16& title) {
-  // We don't have a window title on ChromeOS (right now).
-}
-
-void NativeWidgetGtk::SetWindowIcons(const SkBitmap& window_icon,
-                                     const SkBitmap& app_icon) {
-  // We don't have window icons on ChromeOS.
-}
-
-void NativeWidgetGtk::SetAccessibleName(const string16& name) {
-}
-
-void NativeWidgetGtk::SetAccessibleRole(ui::AccessibilityTypes::Role role) {
-}
-
-void NativeWidgetGtk::SetAccessibleState(ui::AccessibilityTypes::State state) {
-}
-
-void NativeWidgetGtk::InitModalType(ui::ModalType modal_type) {
-  if (modal_type == ui::MODAL_TYPE_NONE)
-    return;
-  gtk_window_set_modal(GetNativeWindow(), true);
-}
-
-gfx::Rect NativeWidgetGtk::GetWindowScreenBounds() const {
-  // Client == Window bounds on Gtk.
-  return GetClientAreaScreenBounds();
-}
-
-gfx::Rect NativeWidgetGtk::GetClientAreaScreenBounds() const {
-  // Due to timing we can get a request for bounds after Close().
-  // TODO(beng): Figure out if this is bogus.
-  if (!widget_)
-    return gfx::Rect(size_);
-
-  int x = 0, y = 0, w = 0, h = 0;
-  if (GTK_IS_WINDOW(widget_)) {
-    gtk_window_get_position(GTK_WINDOW(widget_), &x, &y);
-    // NOTE: this doesn't include frame decorations, but it should be good
-    // enough for our uses.
-    gtk_window_get_size(GTK_WINDOW(widget_), &w, &h);
-  } else {
-    GetWidgetPositionOnScreen(widget_, &x, &y);
-    w = widget_->allocation.width;
-    h = widget_->allocation.height;
-  }
-  return gfx::Rect(x, y, w, h);
-}
-
-gfx::Rect NativeWidgetGtk::GetRestoredBounds() const {
-  // We currently don't support tiling, so this doesn't matter.
-  return GetWindowScreenBounds();
-}
-
-void NativeWidgetGtk::SetBounds(const gfx::Rect& bounds) {
-  if (child_) {
-    GtkWidget* parent = gtk_widget_get_parent(widget_);
-    if (GTK_IS_VIEWS_FIXED(parent)) {
-      NativeWidgetGtk* parent_widget = static_cast<NativeWidgetGtk*>(
-          internal::NativeWidgetPrivate::GetNativeWidgetForNativeView(parent));
-      parent_widget->PositionChild(widget_, bounds.x(), bounds.y(),
-                                   bounds.width(), bounds.height());
-    } else {
-      DCHECK(GTK_IS_FIXED(parent))
-          << "Parent of NativeWidgetGtk has to be Fixed or ViewsFixed";
-      // Just request the size if the parent is not NativeWidgetGtk but plain
-      // GtkFixed. NativeWidgetGtk does not know the minimum size so we assume
-      // the caller of the SetBounds knows exactly how big it wants to be.
-      gtk_widget_set_size_request(widget_, bounds.width(), bounds.height());
-      if (parent != null_parent_)
-        gtk_fixed_move(GTK_FIXED(parent), widget_, bounds.x(), bounds.y());
-    }
-  } else {
-    if (GTK_WIDGET_MAPPED(widget_)) {
-      // If the widget is mapped (on screen), we can move and resize with one
-      // call, which avoids two separate window manager steps.
-      gdk_window_move_resize(widget_->window, bounds.x(), bounds.y(),
-                             bounds.width(), bounds.height());
-    }
-
-    // Always call gtk_window_move and gtk_window_resize so that GtkWindow's
-    // geometry info is up-to-date.
-    GtkWindow* gtk_window = GTK_WINDOW(widget_);
-    // TODO: this may need to set an initial size if not showing.
-    // TODO: need to constrain based on screen size.
-    if (!bounds.IsEmpty()) {
-      gtk_window_resize(gtk_window, bounds.width(), bounds.height());
-    }
-    gtk_window_move(gtk_window, bounds.x(), bounds.y());
-  }
-}
-
-void NativeWidgetGtk::SetSize(const gfx::Size& size) {
-  if (child_) {
-    GtkWidget* parent = gtk_widget_get_parent(widget_);
-    if (GTK_IS_VIEWS_FIXED(parent)) {
-      gtk_views_fixed_set_widget_size(widget_, size.width(), size.height());
-    } else {
-      gtk_widget_set_size_request(widget_, size.width(), size.height());
-    }
-  } else {
-    if (GTK_WIDGET_MAPPED(widget_))
-      gdk_window_resize(widget_->window, size.width(), size.height());
-    GtkWindow* gtk_window = GTK_WINDOW(widget_);
-    if (!size.IsEmpty())
-      gtk_window_resize(gtk_window, size.width(), size.height());
-  }
-}
-
-void NativeWidgetGtk::StackAbove(gfx::NativeView native_view) {
-  ui::StackPopupWindow(GetNativeView(), native_view);
-}
-
-void NativeWidgetGtk::StackAtTop() {
-  DCHECK(GTK_IS_WINDOW(GetNativeView()));
-  gtk_window_present(GTK_WINDOW(GetNativeView()));
-}
-
-void NativeWidgetGtk::StackBelow(gfx::NativeView native_view) {
-  NOTIMPLEMENTED();
-}
-
-void NativeWidgetGtk::SetShape(gfx::NativeRegion region) {
-  if (widget_ && widget_->window) {
-    gdk_window_shape_combine_region(widget_->window, region, 0, 0);
-    gdk_region_destroy(region);
-  }
-}
-
-void NativeWidgetGtk::Close() {
-  if (!widget_)
-    return;  // No need to do anything.
-
-  // Hide first.
-  Hide();
-  if (!close_widget_factory_.HasWeakPtrs()) {
-    // And we delay the close just in case we're on the stack.
-    MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&NativeWidgetGtk::CloseNow,
-                   close_widget_factory_.GetWeakPtr()));
-  }
-}
-
-void NativeWidgetGtk::CloseNow() {
-  if (widget_) {
-    gtk_widget_destroy(widget_);  // Triggers OnDestroy().
-  }
-}
-
-void NativeWidgetGtk::Show() {
-  if (widget_) {
-    gtk_widget_show(widget_);
-    if (widget_->window)
-      gdk_window_raise(widget_->window);
-  }
-}
-
-void NativeWidgetGtk::Hide() {
-  if (widget_) {
-    gtk_widget_hide(widget_);
-    if (widget_->window)
-      gdk_window_lower(widget_->window);
-  }
-}
-
-void NativeWidgetGtk::ShowMaximizedWithBounds(
-    const gfx::Rect& restored_bounds) {
-  // TODO: when we add maximization support update this.
-  Show();
-}
-
-void NativeWidgetGtk::ShowWithWindowState(ui::WindowShowState show_state) {
-  // No concept of maximization (yet) on ChromeOS.
-  if (show_state == ui::SHOW_STATE_INACTIVE)
-    gtk_window_set_focus_on_map(GetNativeWindow(), false);
-  gtk_widget_show(GetNativeView());
-}
-
-bool NativeWidgetGtk::IsVisible() const {
-  return GTK_WIDGET_VISIBLE(GetNativeView()) && (GetWidget()->is_top_level() ||
-      GetWidget()->GetTopLevelWidget()->IsVisible());
-}
-
-void NativeWidgetGtk::Activate() {
-  gtk_window_present(GetNativeWindow());
-}
-
-void NativeWidgetGtk::Deactivate() {
-  gdk_window_lower(GTK_WIDGET(GetNativeView())->window);
-}
-
-bool NativeWidgetGtk::IsActive() const {
-  DCHECK(!child_);
-  return is_active_;
-}
-
-void NativeWidgetGtk::SetAlwaysOnTop(bool on_top) {
-  DCHECK(!child_);
-  always_on_top_ = on_top;
-  if (widget_)
-    gtk_window_set_keep_above(GTK_WINDOW(widget_), on_top);
-}
-
-void NativeWidgetGtk::Maximize() {
-  gtk_window_maximize(GetNativeWindow());
-}
-
-void NativeWidgetGtk::Minimize() {
-  gtk_window_iconify(GetNativeWindow());
-}
-
-bool NativeWidgetGtk::IsMaximized() const {
-  return window_state_ & GDK_WINDOW_STATE_MAXIMIZED;
-}
-
-bool NativeWidgetGtk::IsMinimized() const {
-  return window_state_ & GDK_WINDOW_STATE_ICONIFIED;
-}
-
-void NativeWidgetGtk::Restore() {
-  if (IsFullscreen()) {
-    SetFullscreen(false);
-  } else {
-    if (IsMaximized())
-      gtk_window_unmaximize(GetNativeWindow());
-    else if (IsMinimized())
-      gtk_window_deiconify(GetNativeWindow());
-  }
-}
-
-void NativeWidgetGtk::SetFullscreen(bool fullscreen) {
-  if (fullscreen)
-    gtk_window_fullscreen(GetNativeWindow());
-  else
-    gtk_window_unfullscreen(GetNativeWindow());
-}
-
-bool NativeWidgetGtk::IsFullscreen() const {
-  return window_state_ & GDK_WINDOW_STATE_FULLSCREEN;
-}
-
-void NativeWidgetGtk::SetOpacity(unsigned char opacity) {
-  opacity_ = opacity;
-  if (widget_) {
-    // We can only set the opacity when the widget has been realized.
-    gdk_window_set_opacity(widget_->window, static_cast<gdouble>(opacity) /
-        static_cast<gdouble>(255));
-  }
-}
-
-void NativeWidgetGtk::SetUseDragFrame(bool use_drag_frame) {
-  NOTIMPLEMENTED();
-}
-
-void NativeWidgetGtk::FlashFrame(bool flash) {
-  gtk_window_set_urgency_hint(GTK_WINDOW(GetNativeView()), flash);
-}
-
-bool NativeWidgetGtk::IsAccessibleWidget() const {
-  return false;
-}
-
-void NativeWidgetGtk::RunShellDrag(View* view,
-                                   const ui::OSExchangeData& data,
-                                   const gfx::Point& location,
-                                   int operation) {
-  DoDrag(data, operation);
-}
-
-void NativeWidgetGtk::SchedulePaintInRect(const gfx::Rect& rect) {
-  // No need to schedule paint if
-  // 1) widget_ is NULL. This may happen because this instance may
-  // be deleted after the gtk widget has been destroyed (See OnDestroy()).
-  // 2) widget_ is not drawable (mapped and visible)
-  // 3) If it's never painted before. The first expose event will
-  // paint the area that has to be painted.
-  if (widget_ && GTK_WIDGET_DRAWABLE(widget_) && painted_) {
-    gtk_widget_queue_draw_area(widget_, rect.x(), rect.y(), rect.width(),
-                               rect.height());
-  }
-}
-
-void NativeWidgetGtk::SetCursor(gfx::NativeCursor cursor) {
-  // |window_contents_| is placed on top of |widget_|. So the cursor needs to be
-  // set on |window_contents_| instead of |widget_|.
-  if (window_contents_)
-    gdk_window_set_cursor(window_contents_->window, cursor);
-}
-
-void NativeWidgetGtk::ClearNativeFocus() {
-  DCHECK(!child_);
-  if (!GetNativeView()) {
-    NOTREACHED();
-    return;
-  }
-  gtk_window_set_focus(GTK_WINDOW(GetNativeView()), NULL);
-}
-
-void NativeWidgetGtk::FocusNativeView(gfx::NativeView native_view) {
-  if (native_view && !gtk_widget_is_focus(native_view))
-    gtk_widget_grab_focus(native_view);
-}
-
-gfx::Rect NativeWidgetGtk::GetWorkAreaBoundsInScreen() const {
-  return gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
-}
-
-void NativeWidgetGtk::SetInactiveRenderingDisabled(bool value) {
-}
-
-Widget::MoveLoopResult NativeWidgetGtk::RunMoveLoop() {
-  NOTIMPLEMENTED();
-  return Widget::MOVE_LOOP_CANCELED;
-}
-
-void NativeWidgetGtk::EndMoveLoop() {
-  NOTIMPLEMENTED();
-}
-
-void NativeWidgetGtk::SetVisibilityChangedAnimationsEnabled(bool value) {
-  // Nothing needed on gtk.
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk, protected:
-
-void NativeWidgetGtk::OnSizeRequest(GtkWidget* widget,
-                                    GtkRequisition* requisition) {
-  // Do only return the preferred size for child windows. GtkWindow interprets
-  // the requisition as a minimum size for top level windows, returning a
-  // preferred size for these would prevents us from setting smaller window
-  // sizes.
-  if (child_) {
-    gfx::Size size(GetWidget()->GetRootView()->GetPreferredSize());
-    requisition->width = size.width();
-    requisition->height = size.height();
-  }
-}
-
-void NativeWidgetGtk::OnSizeAllocate(GtkWidget* widget,
-                                     GtkAllocation* allocation) {
-  // See comment next to size_ as to why we do this. Also note, it's tempting
-  // to put this in the static method so subclasses don't need to worry about
-  // it, but if a subclasses needs to set a shape then they need to always
-  // reset the shape in this method regardless of whether the size changed.
-  gfx::Size new_size(allocation->width, allocation->height);
-  if (new_size == size_)
-    return;
-  size_ = new_size;
-  delegate_->OnNativeWidgetSizeChanged(size_);
-
-  if (GetWidget()->non_client_view()) {
-    // The Window's NonClientView may provide a custom shape for the Window.
-    gfx::Path window_mask;
-    GetWidget()->non_client_view()->GetWindowMask(gfx::Size(allocation->width,
-                                                            allocation->height),
-                                                  &window_mask);
-    GdkRegion* mask_region = window_mask.CreateNativeRegion();
-    gdk_window_shape_combine_region(GetNativeView()->window, mask_region, 0, 0);
-    if (mask_region)
-      gdk_region_destroy(mask_region);
-
-    SaveWindowPosition();
-  }
-}
-
-gboolean NativeWidgetGtk::OnPaint(GtkWidget* widget, GdkEventExpose* event) {
-  gdk_window_set_debug_updates(Widget::IsDebugPaintEnabled());
-
-  if (transparent_ && child_) {
-    // Clear the background before drawing any view and native components.
-    DrawTransparentBackground(widget, event);
-    if (!CompositePainter::IsComposited(widget_) &&
-        gdk_screen_is_composited(gdk_screen_get_default())) {
-      // Let the parent draw the content only after something is drawn on
-      // the widget.
-      CompositePainter::SetComposited(widget_);
-    }
-  }
-
-  ui::ScopedRegion region(gdk_region_copy(event->region));
-  if (!gdk_region_empty(region.Get())) {
-    GdkRectangle clip_bounds;
-    gdk_region_get_clipbox(region.Get(), &clip_bounds);
-    if (!delegate_->OnNativeWidgetPaintAccelerated(gfx::Rect(clip_bounds))) {
-      gfx::CanvasSkiaPaint canvas(event);
-      if (!canvas.is_empty()) {
-        canvas.set_composite_alpha(is_transparent());
-        delegate_->OnNativeWidgetPaint(&canvas);
-      }
-    }
-  }
-
-  if (!painted_) {
-    painted_ = true;
-    if (!child_)
-      UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
-  }
-  return false;  // False indicates other widgets should get the event as well.
-}
-
-void NativeWidgetGtk::OnDragDataGet(GtkWidget* widget,
-                                    GdkDragContext* context,
-                                    GtkSelectionData* data,
-                                    guint info,
-                                    guint time) {
-  if (!drag_data_) {
-    NOTREACHED();
-    return;
-  }
-  drag_data_->WriteFormatToSelection(info, data);
-}
-
-void NativeWidgetGtk::OnDragDataReceived(GtkWidget* widget,
-                                         GdkDragContext* context,
-                                         gint x,
-                                         gint y,
-                                         GtkSelectionData* data,
-                                         guint info,
-                                         guint time) {
-  if (drop_target_.get())
-    drop_target_->OnDragDataReceived(context, x, y, data, info, time);
-}
-
-gboolean NativeWidgetGtk::OnDragDrop(GtkWidget* widget,
-                                     GdkDragContext* context,
-                                     gint x,
-                                     gint y,
-                                     guint time) {
-  if (drop_target_.get()) {
-    return drop_target_->OnDragDrop(context, x, y, time);
-  }
-  return FALSE;
-}
-
-void NativeWidgetGtk::OnDragEnd(GtkWidget* widget, GdkDragContext* context) {
-  if (!drag_data_) {
-    // This indicates we didn't start a drag operation, and should never
-    // happen.
-    NOTREACHED();
-    return;
-  }
-  // Quit the nested message loop we spawned in DoDrag.
-  MessageLoop::current()->Quit();
-}
-
-gboolean NativeWidgetGtk::OnDragFailed(GtkWidget* widget,
-                                       GdkDragContext* context,
-                                       GtkDragResult result) {
-  return FALSE;
-}
-
-void NativeWidgetGtk::OnDragLeave(GtkWidget* widget,
-                                  GdkDragContext* context,
-                                  guint time) {
-  if (ignore_drag_leave_) {
-    ignore_drag_leave_ = false;
-    return;
-  }
-  if (drop_target_.get()) {
-    drop_target_->OnDragLeave(context, time);
-    drop_target_.reset(NULL);
-  }
-}
-
-gboolean NativeWidgetGtk::OnDragMotion(GtkWidget* widget,
-                                       GdkDragContext* context,
-                                       gint x,
-                                       gint y,
-                                       guint time) {
-  if (!drop_target_.get()) {
-    drop_target_.reset(new DropTargetGtk(
-        reinterpret_cast<internal::RootView*>(GetWidget()->GetRootView()),
-        context));
-  }
-  return drop_target_->OnDragMotion(context, x, y, time);
-}
-
-gboolean NativeWidgetGtk::OnEnterNotify(GtkWidget* widget,
-                                        GdkEventCrossing* event) {
-  if (HasMouseCapture() && event->mode == GDK_CROSSING_GRAB) {
-    // Doing a grab results an async enter event, regardless of where the mouse
-    // is. We don't want to generate a mouse move in this case.
-    return false;
-  }
-
-  if (!GetWidget()->last_mouse_event_was_move_ &&
-      !GetWidget()->is_mouse_button_pressed_) {
-    // When a mouse button is pressed gtk generates a leave, enter, press.
-    // RootView expects to get a mouse move before a press, otherwise enter is
-    // not set. So we generate a move here.
-    GdkEventMotion motion = { GDK_MOTION_NOTIFY, event->window,
-        event->send_event, event->time, event->x, event->y, NULL, event->state,
-        0, NULL, event->x_root, event->y_root };
-
-    // If this event is the result of pressing a button then one of the button
-    // modifiers is set. Unset it as we're compensating for the leave generated
-    // when you press a button.
-    motion.state &= ~(GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK);
-
-    MouseEvent mouse_event(TransformEvent(&motion));
-    delegate_->OnMouseEvent(mouse_event);
-  }
-  return false;
-}
-
-gboolean NativeWidgetGtk::OnLeaveNotify(GtkWidget* widget,
-                                        GdkEventCrossing* event) {
-  gdk_window_set_cursor(widget->window, gfx::GetCursor(GDK_LEFT_PTR));
-
-  GetWidget()->ResetLastMouseMoveFlag();
-
-  if (!HasMouseCapture() && !GetWidget()->is_mouse_button_pressed_) {
-    // Don't convert if the event is synthetic and has 0x0 coordinates.
-    if (event->x_root || event->y_root || event->x || event->y ||
-        !event->send_event) {
-      TransformEvent(event);
-    }
-    MouseEvent mouse_event(reinterpret_cast<GdkEvent*>(event));
-    delegate_->OnMouseEvent(mouse_event);
-  }
-  return false;
-}
-
-gboolean NativeWidgetGtk::OnMotionNotify(GtkWidget* widget,
-                                         GdkEventMotion* event) {
-  if (GetWidget()->non_client_view()) {
-    GdkEventMotion transformed_event = *event;
-    TransformEvent(&transformed_event);
-    gfx::Point translated_location(transformed_event.x, transformed_event.y);
-
-    // Update the cursor for the screen edge.
-    int hittest_code =
-        GetWidget()->non_client_view()->NonClientHitTest(translated_location);
-    if (hittest_code != HTCLIENT) {
-      GdkCursorType cursor_type = HitTestCodeToGdkCursorType(hittest_code);
-      gdk_window_set_cursor(widget->window, gfx::GetCursor(cursor_type));
-    }
-  }
-
-  MouseEvent mouse_event(TransformEvent(event));
-  delegate_->OnMouseEvent(mouse_event);
-  return true;
-}
-
-gboolean NativeWidgetGtk::OnButtonPress(GtkWidget* widget,
-                                        GdkEventButton* event) {
-  if (GetWidget()->non_client_view()) {
-    GdkEventButton transformed_event = *event;
-    MouseEvent mouse_event(TransformEvent(&transformed_event));
-
-    int hittest_code = GetWidget()->non_client_view()->NonClientHitTest(
-        mouse_event.location());
-    switch (hittest_code) {
-      case HTCAPTION: {
-        // Start dragging if the mouse event is a single click and *not* a right
-        // click. If it is a right click, then pass it through to
-        // NativeWidgetGtk::OnButtonPress so that View class can show
-        // ContextMenu upon a mouse release event. We only start drag on single
-        // clicks as we get a crash in Gtk on double/triple clicks.
-        if (event->type == GDK_BUTTON_PRESS &&
-            !mouse_event.IsOnlyRightMouseButton()) {
-          gfx::Point screen_point(event->x, event->y);
-          View::ConvertPointToScreen(GetWidget()->GetRootView(), &screen_point);
-          gtk_window_begin_move_drag(GetNativeWindow(), event->button,
-                                     screen_point.x(), screen_point.y(),
-                                     event->time);
-          return TRUE;
-        }
-        break;
-      }
-      case HTBOTTOM:
-      case HTBOTTOMLEFT:
-      case HTBOTTOMRIGHT:
-      case HTGROWBOX:
-      case HTLEFT:
-      case HTRIGHT:
-      case HTTOP:
-      case HTTOPLEFT:
-      case HTTOPRIGHT: {
-        gfx::Point screen_point(event->x, event->y);
-        View::ConvertPointToScreen(GetWidget()->GetRootView(), &screen_point);
-        // TODO(beng): figure out how to get a good minimum size.
-        gtk_widget_set_size_request(GetNativeView(), 100, 100);
-        gtk_window_begin_resize_drag(GetNativeWindow(),
-                                     HitTestCodeToGDKWindowEdge(hittest_code),
-                                     event->button, screen_point.x(),
-                                     screen_point.y(), event->time);
-        return TRUE;
-      }
-      default:
-        // Everything else falls into standard client event handling...
-        break;
-    }
-  }
-
-  if (event->type == GDK_2BUTTON_PRESS || event->type == GDK_3BUTTON_PRESS) {
-    // The sequence for double clicks is press, release, press, 2press, release.
-    // This means that at the time we get the second 'press' we don't know
-    // whether it corresponds to a double click or not. For now we're completely
-    // ignoring the 2press/3press events as they are duplicate. To make this
-    // work right we need to write our own code that detects if the press is a
-    // double/triple. For now we're completely punting, which means we always
-    // get single clicks.
-    // TODO: fix this.
-    return true;
-  }
-
-  MouseEvent mouse_event(TransformEvent(event));
-  // Returns true to consume the event when widget is not transparent.
-  return delegate_->OnMouseEvent(mouse_event) || !transparent_;
-}
-
-gboolean NativeWidgetGtk::OnButtonRelease(GtkWidget* widget,
-                                          GdkEventButton* event) {
-  // GTK generates a mouse release at the end of dnd. We need to ignore it.
-  if (!drag_data_) {
-    MouseEvent mouse_event(TransformEvent(event));
-    delegate_->OnMouseEvent(mouse_event);
-  }
-  return true;
-}
-
-gboolean NativeWidgetGtk::OnScroll(GtkWidget* widget, GdkEventScroll* event) {
-  MouseWheelEvent mouse_event(TransformEvent(event));
-  return delegate_->OnMouseEvent(mouse_event);
-}
-
-gboolean NativeWidgetGtk::OnFocusIn(GtkWidget* gtk_widget,
-                                    GdkEventFocus* event) {
-  if (has_focus_)
-    return false;  // This is the second focus-in event in a row, ignore it.
-  has_focus_ = true;
-
-  Widget* widget = GetWidget();
-
-  if (widget->GetFocusManager())
-    widget->GetFocusManager()->ResetMenuKeyState();
-
-  if (!widget->is_top_level())
-    return false;
-
-  // Only top-level Widget should have an InputMethod instance.
-  InputMethod* input_method = widget->GetInputMethod();
-  if (input_method)
-    input_method->OnFocus();
-
-  // See description of got_initial_focus_in_ for details on this.
-  if (!got_initial_focus_in_) {
-    got_initial_focus_in_ = true;
-    // Sets initial focus here. On X11/Gtk, window creation
-    // is asynchronous and a focus request has to be made after a window
-    // gets created.
-    widget->SetInitialFocus();
-  }
-  return false;
-}
-
-gboolean NativeWidgetGtk::OnFocusOut(GtkWidget* widget, GdkEventFocus* event) {
-  if (!has_focus_)
-    return false;  // This is the second focus-out event in a row, ignore it.
-  has_focus_ = false;
-
-  if (!GetWidget()->is_top_level())
-    return false;
-
-  // Only top-level Widget should have an InputMethod instance.
-  InputMethod* input_method = GetWidget()->GetInputMethod();
-  if (input_method)
-    input_method->OnBlur();
-  return false;
-}
-
-gboolean NativeWidgetGtk::OnEventKey(GtkWidget* widget, GdkEventKey* event) {
-  KeyEvent key(reinterpret_cast<GdkEvent*>(event));
-  InputMethod* input_method = GetWidget()->GetInputMethod();
-  if (input_method)
-    input_method->DispatchKeyEvent(key);
-  else
-    DispatchKeyEventPostIME(key);
-
-  // Returns true to prevent GtkWindow's default key event handler.
-  return true;
-}
-
-gboolean NativeWidgetGtk::OnQueryTooltip(GtkWidget* widget,
-                                         gint x,
-                                         gint y,
-                                         gboolean keyboard_mode,
-                                         GtkTooltip* tooltip) {
-  return static_cast<TooltipManagerGtk*>(tooltip_manager_.get())->
-      ShowTooltip(x, y, keyboard_mode, tooltip);
-}
-
-gboolean NativeWidgetGtk::OnVisibilityNotify(GtkWidget* widget,
-                                             GdkEventVisibility* event) {
-  return false;
-}
-
-gboolean NativeWidgetGtk::OnGrabBrokeEvent(GtkWidget* widget, GdkEvent* event) {
-  if (!has_pointer_grab_ && !has_keyboard_grab_) {
-    // We don't have any grabs; don't attempt to do anything.
-    return false;
-  }
-
-  // Sent when either the keyboard or pointer grab is broke. We drop both grabs
-  // in this case.
-  if (event->grab_broken.keyboard) {
-    // Keyboard grab was broke.
-    has_keyboard_grab_ = false;
-    if (has_pointer_grab_) {
-      has_pointer_grab_ = false;
-      gdk_pointer_ungrab(GDK_CURRENT_TIME);
-      delegate_->OnMouseCaptureLost();
-    }
-  } else {
-    // Mouse grab was broke.
-    has_pointer_grab_ = false;
-    if (has_keyboard_grab_) {
-      has_keyboard_grab_ = false;
-      gdk_keyboard_ungrab(GDK_CURRENT_TIME);
-    }
-    delegate_->OnMouseCaptureLost();
-  }
-  ReleaseMouseCapture();
-
-  return false;  // To let other widgets get the event.
-}
-
-void NativeWidgetGtk::OnGrabNotify(GtkWidget* widget, gboolean was_grabbed) {
-  // Sent when gtk_grab_add changes.
-  if (!window_contents_)
-    return;  // Grab broke after window destroyed, don't try processing it.
-  if (!was_grabbed)  // Indicates we've been shadowed (lost grab).
-    HandleGtkGrabBroke();
-}
-
-void NativeWidgetGtk::OnDestroy(GtkWidget* object) {
-  signal_registrar_.reset();
-  destroy_signal_registrar_.reset();
-  if (grab_notify_signal_id_) {
-    g_signal_handler_disconnect(window_contents_, grab_notify_signal_id_);
-    grab_notify_signal_id_ = 0;
-  }
-  delegate_->OnNativeWidgetDestroying();
-  if (!child_)
-    ActiveWindowWatcherX::RemoveObserver(this);
-  if (widget_)
-    SetNativeWindowProperty(kNativeWidgetKey, NULL);
-
-  // Note that this handler is hooked to GtkObject::destroy.
-  // NULL out pointers here since we might still be in an observer list
-  // until deletion happens.
-  widget_ = window_contents_ = NULL;
-}
-
-void NativeWidgetGtk::OnDestroyed(GObject *where_the_object_was) {
-  delegate_->OnNativeWidgetDestroyed();
-  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)
-    delete this;
-}
-
-void NativeWidgetGtk::OnShow(GtkWidget* widget) {
-  delegate_->OnNativeWidgetVisibilityChanged(true);
-}
-
-void NativeWidgetGtk::OnMap(GtkWidget* widget) {
-}
-
-void NativeWidgetGtk::OnHide(GtkWidget* widget) {
-  delegate_->OnNativeWidgetVisibilityChanged(false);
-}
-
-gboolean NativeWidgetGtk::OnWindowStateEvent(GtkWidget* widget,
-                                             GdkEventWindowState* event) {
-  if (GetWidget()->non_client_view() &&
-      !(event->new_window_state & GDK_WINDOW_STATE_WITHDRAWN)) {
-    SaveWindowPosition();
-  }
-  window_state_ = event->new_window_state;
-  return FALSE;
-}
-
-gboolean NativeWidgetGtk::OnConfigureEvent(GtkWidget* widget,
-                                           GdkEventConfigure* event) {
-  SaveWindowPosition();
-  return FALSE;
-}
-
-void NativeWidgetGtk::HandleGtkGrabBroke() {
-  ReleaseMouseCapture();
-  delegate_->OnMouseCaptureLost();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetGtk, private:
-
-void NativeWidgetGtk::DispatchKeyEventPostIME(const KeyEvent& key) {
-  if (GetWidget()->GetFocusManager())
-    GetWidget()->GetFocusManager()->MaybeResetMenuKeyState(key);
-
-  // Send the key event to View hierarchy first.
-  bool handled = delegate_->OnKeyEvent(key);
-
-  if (key.key_code() == ui::VKEY_PROCESSKEY || handled)
-    return;
-
-  // Dispatch the key event to native GtkWidget hierarchy.
-  // To prevent GtkWindow from handling the key event as a keybinding, we need
-  // to bypass GtkWindow's default key event handler and dispatch the event
-  // here.
-  GdkEventKey* event = reinterpret_cast<GdkEventKey*>(key.gdk_event());
-  if (!handled && event && GTK_IS_WINDOW(widget_))
-    handled = gtk_window_propagate_key_event(GTK_WINDOW(widget_), event);
-
-  // On Linux, in order to handle VKEY_MENU (Alt) accelerator key correctly and
-  // avoid issues like: http://crbug.com/40966 and http://crbug.com/49701, we
-  // should only send the key event to the focus manager if it's not handled by
-  // any View or native GtkWidget.
-  // The flow is different when the focus is in a RenderWidgetHostViewGtk, which
-  // always consumes the key event and send it back to us later by calling
-  // HandleKeyboardEvent() directly, if it's not handled by webkit.
-  if (!handled)
-    handled = HandleKeyboardEvent(key);
-
-  // Dispatch the key event for bindings processing.
-  if (!handled && event && GTK_IS_WINDOW(widget_))
-    gtk_bindings_activate_event(GTK_OBJECT(widget_), event);
-}
-
-void NativeWidgetGtk::SetInitParams(const Widget::InitParams& params) {
-  DCHECK(!GetNativeView());
-
-  ownership_ = params.ownership;
-  child_ = params.child;
-  is_menu_ = params.type == Widget::InitParams::TYPE_MENU;
-
-  // TODO(beng): The secondary checks here actually obviate the need for
-  //             params.transient but that's only because NativeWidgetGtk
-  //             considers any top-level widget to be a transient widget. We
-  //             will probably want to ammend this assumption at some point.
-  if (params.transient || params.parent || params.parent_widget)
-    transient_to_parent_  = true;
-  if (params.transparent)
-    MakeTransparent();
-  if (!params.accept_events && !child_)
-    ignore_events_ = true;
-  if (params.double_buffer)
-    EnableDoubleBuffer(true);
-}
-
-gboolean NativeWidgetGtk::OnWindowPaint(GtkWidget* widget,
-                                        GdkEventExpose* event) {
-  // Clear the background to be totally transparent. We don't need to
-  // paint the root view here as that is done by OnPaint.
-  DCHECK(transparent_);
-  DrawTransparentBackground(widget, event);
-  // The Keyboard layout view has a renderer that covers the entire
-  // window, which prevents OnPaint from being called on window_contents_,
-  // so we need to remove the FREEZE_UPDATES property here.
-  if (!painted_) {
-    painted_ = true;
-    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
-  }
-  return false;
-}
-
-void NativeWidgetGtk::OnChildExpose(GtkWidget* child) {
-  DCHECK(!child_);
-  if (!painted_) {
-    painted_ = true;
-    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
-  }
-  UnregisterChildExposeHandler(child);
-}
-
-// static
-gboolean NativeWidgetGtk::ChildExposeHandler(GtkWidget* widget,
-                                             GdkEventExpose* event) {
-  GtkWidget* toplevel = gtk_widget_get_ancestor(widget, GTK_TYPE_WINDOW);
-  CHECK(toplevel);
-  Widget* views_widget = Widget::GetWidgetForNativeView(toplevel);
-  CHECK(views_widget);
-  NativeWidgetGtk* widget_gtk =
-      static_cast<NativeWidgetGtk*>(views_widget->native_widget());
-  widget_gtk->OnChildExpose(widget);
-  return false;
-}
-
-void NativeWidgetGtk::CreateGtkWidget(const Widget::InitParams& params) {
-  // We turn off double buffering for two reasons:
-  // 1. We draw to a canvas then composite to the screen, which means we're
-  //    doing our own double buffering already.
-  // 2. GTKs double buffering clips to the dirty region. RootView occasionally
-  //    needs to expand the paint region (see RootView::OnPaint). This means
-  //    that if we use GTK's double buffering and we tried to expand the dirty
-  //    region, it wouldn't get painted.
-  if (child_) {
-    window_contents_ = widget_ = gtk_views_fixed_new();
-    gtk_widget_set_name(widget_, "views-gtkwidget-child-fixed");
-    if (!is_double_buffered_)
-      GTK_WIDGET_UNSET_FLAGS(widget_, GTK_DOUBLE_BUFFERED);
-    gtk_fixed_set_has_window(GTK_FIXED(widget_), true);
-    if (!params.parent && !null_parent_) {
-      GtkWidget* popup = gtk_window_new(GTK_WINDOW_POPUP);
-      null_parent_ = gtk_fixed_new();
-      gtk_widget_set_name(null_parent_, "views-gtkwidget-null-parent");
-      gtk_container_add(GTK_CONTAINER(popup), null_parent_);
-      gtk_widget_realize(null_parent_);
-    }
-    if (transparent_) {
-      // transparency has to be configured before widget is realized.
-      DCHECK(params.parent) <<
-          "Transparent widget must have parent when initialized";
-      ConfigureWidgetForTransparentBackground(params.parent);
-    }
-    gtk_container_add(
-        GTK_CONTAINER(params.parent ? params.parent : null_parent_), widget_);
-    gtk_widget_realize(widget_);
-    if (transparent_) {
-      // The widget has to be realized to set composited flag.
-      // I tried "realize" signal to set this flag, but it did not work
-      // when the top level is popup.
-      DCHECK(GTK_WIDGET_REALIZED(widget_));
-      gdk_window_set_composited(widget_->window, true);
-    }
-    if (params.parent && !params.bounds.size().IsEmpty()) {
-      // Make sure that an widget is given it's initial size before
-      // we're done initializing, to take care of some potential
-      // corner cases when programmatically arranging hierarchies as
-      // seen in
-      // http://code.google.com/p/chromium-os/issues/detail?id=5987
-
-      // This can't be done without a parent present, or stale data
-      // might show up on the screen as seen in
-      // http://code.google.com/p/chromium/issues/detail?id=53870
-      GtkAllocation alloc =
-          { 0, 0, params.bounds.width(), params.bounds.height() };
-      gtk_widget_size_allocate(widget_, &alloc);
-    }
-    if (params.type == Widget::InitParams::TYPE_CONTROL) {
-      // Controls are initially visible.
-      gtk_widget_show(widget_);
-    }
-  } else {
-    Widget::InitParams::Type type = params.type;
-    if (type == Widget::InitParams::TYPE_BUBBLE &&
-        params.delegate->AsBubbleDelegate() &&
-        params.delegate->AsBubbleDelegate()->use_focusless()) {
-      // Handles focusless bubble type, which are bubbles that should
-      // act like popups rather than gtk windows. They do not get focus
-      // and are not controlled by window manager placement.
-      type = Widget::InitParams::TYPE_POPUP;
-    }
-
-    // Use our own window class to override GtkWindow's move_focus method.
-    widget_ = gtk_views_window_new(WindowTypeToGtkWindowType(type));
-    gtk_widget_set_name(widget_, "views-gtkwidget-window");
-    if (transient_to_parent_) {
-      gtk_window_set_transient_for(GTK_WINDOW(widget_),
-                                   GTK_WINDOW(params.parent));
-    }
-    GTK_WIDGET_UNSET_FLAGS(widget_, GTK_DOUBLE_BUFFERED);
-
-    // Gtk determines the size for windows based on the requested size of the
-    // child. For NativeWidgetGtk the child is a fixed. If the fixed ends up
-    // with a child widget it's possible the child widget will drive the
-    // requested size of the widget, which we don't want. We explicitly set a
-    // value of 1x1 here so that gtk doesn't attempt to resize the window if we
-    // end up with a situation where the requested size of a child of the fixed
-    // is greater than the size of the window. By setting the size in this
-    // manner we're also allowing users of WidgetGtk to change the requested
-    // size at any time.
-    gtk_widget_set_size_request(widget_, 1, 1);
-
-    if (!params.bounds.size().IsEmpty()) {
-      // When we realize the window, the window manager is given a size. If we
-      // don't specify a size before then GTK defaults to 200x200. Specify
-      // a size now so that the window manager sees the requested size.
-      GtkAllocation alloc =
-          { 0, 0, params.bounds.width(), params.bounds.height() };
-      gtk_widget_size_allocate(widget_, &alloc);
-    }
-    gtk_window_set_decorated(GTK_WINDOW(widget_), false);
-    // We'll take care of positioning our window.
-    gtk_window_set_position(GTK_WINDOW(widget_), GTK_WIN_POS_NONE);
-
-    window_contents_ = gtk_views_fixed_new();
-    gtk_widget_set_name(window_contents_, "views-gtkwidget-window-fixed");
-    if (!is_double_buffered_)
-      GTK_WIDGET_UNSET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
-    gtk_fixed_set_has_window(GTK_FIXED(window_contents_), true);
-    gtk_container_add(GTK_CONTAINER(widget_), window_contents_);
-    gtk_widget_show(window_contents_);
-    g_object_set_data(G_OBJECT(window_contents_), kNativeWidgetKey,
-                       static_cast<NativeWidgetGtk*>(this));
-    if (transparent_)
-      ConfigureWidgetForTransparentBackground(NULL);
-
-    if (ignore_events_)
-      ConfigureWidgetForIgnoreEvents();
-
-    // Realize the window_contents_ so that we can always get a handle for
-    // acceleration. Without this we need to check every time paint is
-    // invoked.
-    gtk_widget_realize(window_contents_);
-
-    SetAlwaysOnTop(always_on_top_);
-    // UpdateFreezeUpdatesProperty will realize the widget and handlers like
-    // size-allocate will function properly.
-    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), true /* add */);
-  }
-  SetNativeWindowProperty(kNativeWidgetKey, this);
-}
-
-void NativeWidgetGtk::ConfigureWidgetForTransparentBackground(
-    GtkWidget* parent) {
-  DCHECK(widget_ && window_contents_);
-
-  GdkColormap* rgba_colormap =
-      gdk_screen_get_rgba_colormap(gtk_widget_get_screen(widget_));
-  if (!rgba_colormap) {
-    transparent_ = false;
-    return;
-  }
-  // To make the background transparent we need to install the RGBA colormap
-  // on both the window and fixed. In addition we need to make sure no
-  // decorations are drawn. The last bit is to make sure the widget doesn't
-  // attempt to draw a pixmap in it's background.
-  if (!child_) {
-    DCHECK(parent == NULL);
-    gtk_widget_set_colormap(widget_, rgba_colormap);
-    gtk_widget_set_app_paintable(widget_, true);
-    signal_registrar_->Connect(widget_, "expose_event",
-                               G_CALLBACK(&OnWindowPaintThunk), this);
-    gtk_widget_realize(widget_);
-    gdk_window_set_decorations(widget_->window,
-                               static_cast<GdkWMDecoration>(0));
-  } else {
-    DCHECK(parent);
-    CompositePainter::AddCompositePainter(parent);
-  }
-  DCHECK(!GTK_WIDGET_REALIZED(window_contents_));
-  gtk_widget_set_colormap(window_contents_, rgba_colormap);
-}
-
-void NativeWidgetGtk::ConfigureWidgetForIgnoreEvents() {
-  gtk_widget_realize(widget_);
-  GdkWindow* gdk_window = widget_->window;
-  Display* display = GDK_WINDOW_XDISPLAY(gdk_window);
-  XID win = GDK_WINDOW_XID(gdk_window);
-
-  // This sets the clickable area to be empty, allowing all events to be
-  // passed to any windows behind this one.
-  XShapeCombineRectangles(
-      display,
-      win,
-      ShapeInput,
-      0,  // x offset
-      0,  // y offset
-      NULL,  // rectangles
-      0,  // num rectangles
-      ShapeSet,
-      0);
-}
-
-void NativeWidgetGtk::DrawTransparentBackground(GtkWidget* widget,
-                                                GdkEventExpose* event) {
-  cairo_t* cr = gdk_cairo_create(widget->window);
-  cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
-  gdk_cairo_region(cr, event->region);
-  cairo_fill(cr);
-  cairo_destroy(cr);
-}
-
-void NativeWidgetGtk::SaveWindowPosition() {
-  // The delegate may have gone away on us.
-  if (!GetWidget()->widget_delegate())
-    return;
-
-  ui::WindowShowState show_state = ui::SHOW_STATE_NORMAL;
-  if (IsMaximized())
-    show_state = ui::SHOW_STATE_MAXIMIZED;
-  else if (IsMinimized())
-    show_state = ui::SHOW_STATE_MINIMIZED;
-  GetWidget()->widget_delegate()->SaveWindowPlacement(
-      GetWidget()->GetWindowScreenBounds(),
-      show_state);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// Widget, public:
-
-// static
-void Widget::NotifyLocaleChanged() {
-  GList *window_list = gtk_window_list_toplevels();
-  for (GList* element = window_list; element; element = g_list_next(element)) {
-    Widget* widget =
-        Widget::GetWidgetForNativeWindow(GTK_WINDOW(element->data));
-    if (widget)
-      widget->LocaleChanged();
-  }
-  g_list_free(window_list);
-}
-
-// static
-void Widget::CloseAllSecondaryWidgets() {
-  GList* windows = gtk_window_list_toplevels();
-  for (GList* window = windows; window;
-       window = g_list_next(window)) {
-    Widget* widget = Widget::GetWidgetForNativeView(GTK_WIDGET(window->data));
-    if (widget && widget->is_secondary_widget())
-      widget->Close();
-  }
-  g_list_free(windows);
-}
-
-// static
-bool Widget::ConvertRect(const Widget* source,
-                         const Widget* target,
-                         gfx::Rect* rect) {
-  DCHECK(source);
-  DCHECK(target);
-  DCHECK(rect);
-
-  // TODO(oshima): Add check if source and target belongs to the same
-  // screen.
-
-  if (source == target)
-    return true;
-  if (!source || !target)
-    return false;
-
-  gfx::Point source_point = source->GetWindowScreenBounds().origin();
-  gfx::Point target_point = target->GetWindowScreenBounds().origin();
-
-  rect->set_origin(
-      source_point.Subtract(target_point).Add(rect->origin()));
-  return true;
-}
-
-namespace internal {
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeWidgetPrivate, public:
-
-// static
-NativeWidgetPrivate* NativeWidgetPrivate::CreateNativeWidget(
-    NativeWidgetDelegate* delegate) {
-  return new NativeWidgetGtk(delegate);
-}
-
-// static
-NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeView(
-    gfx::NativeView native_view) {
-  if (!native_view)
-    return NULL;
-  return reinterpret_cast<NativeWidgetGtk*>(
-      g_object_get_data(G_OBJECT(native_view), kNativeWidgetKey));
-}
-
-// static
-NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeWindow(
-    gfx::NativeWindow native_window) {
-  if (!native_window)
-    return NULL;
-  return reinterpret_cast<NativeWidgetGtk*>(
-      g_object_get_data(G_OBJECT(native_window), kNativeWidgetKey));
-}
-
-// static
-NativeWidgetPrivate* NativeWidgetPrivate::GetTopLevelNativeWidget(
-    gfx::NativeView native_view) {
-  if (!native_view)
-    return NULL;
-
-  NativeWidgetPrivate* widget = NULL;
-
-  GtkWidget* parent_gtkwidget = native_view;
-  NativeWidgetPrivate* parent_widget;
-  do {
-    parent_widget = GetNativeWidgetForNativeView(parent_gtkwidget);
-    if (parent_widget)
-      widget = parent_widget;
-    parent_gtkwidget = gtk_widget_get_parent(parent_gtkwidget);
-  } while (parent_gtkwidget);
-
-  return widget && widget->GetWidget()->is_top_level() ? widget : NULL;
-}
-
-// static
-void NativeWidgetPrivate::GetAllChildWidgets(gfx::NativeView native_view,
-                                             Widget::Widgets* children) {
-  if (!native_view)
-    return;
-
-  Widget* widget = Widget::GetWidgetForNativeView(native_view);
-  if (widget)
-    children->insert(widget);
-  gtk_container_foreach(GTK_CONTAINER(native_view),
-                        EnumerateChildWidgetsForNativeWidgets,
-                        reinterpret_cast<gpointer>(children));
-}
-
-// static
-void NativeWidgetPrivate::ReparentNativeView(gfx::NativeView native_view,
-                                             gfx::NativeView new_parent) {
-  if (!native_view)
-    return;
-
-  gfx::NativeView previous_parent = gtk_widget_get_parent(native_view);
-  if (previous_parent == new_parent)
-    return;
-
-  Widget::Widgets widgets;
-  GetAllChildWidgets(native_view, &widgets);
-
-  // First notify all the widgets that they are being disassociated
-  // from their previous parent.
-  for (Widget::Widgets::iterator it = widgets.begin();
-       it != widgets.end(); ++it) {
-    // TODO(beng): Rename this notification to NotifyNativeViewChanging()
-    // and eliminate the bool parameter.
-    (*it)->NotifyNativeViewHierarchyChanged(false, previous_parent);
-  }
-
-  if (gtk_widget_get_parent(native_view))
-    gtk_widget_reparent(native_view, new_parent);
-  else
-    gtk_container_add(GTK_CONTAINER(new_parent), native_view);
-
-  // And now, notify them that they have a brand new parent.
-  for (Widget::Widgets::iterator it = widgets.begin();
-       it != widgets.end(); ++it) {
-    (*it)->NotifyNativeViewHierarchyChanged(true, new_parent);
-  }
-}
-
-// static
-bool NativeWidgetPrivate::IsMouseButtonDown() {
-  bool button_pressed = false;
-  GdkEvent* event = gtk_get_current_event();
-  if (event) {
-    button_pressed = event->type == GDK_BUTTON_PRESS ||
-        event->type == GDK_2BUTTON_PRESS ||
-        event->type == GDK_3BUTTON_PRESS;
-    gdk_event_free(event);
-  }
-  return button_pressed;
-}
-
-}  // namespace internal
-}  // namespace views