views/view.cc - chromium/src - Git at Google

 // Copyright (c) 2011 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 "views/view.h"

 #include <algorithm>

 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "ui/base/accessibility/accessibility_types.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/gfx/canvas_skia.h"
 #include "ui/gfx/compositor/compositor.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/transform.h"
 #include "views/background.h"
 #include "views/layout/layout_manager.h"
 #include "views/views_delegate.h"
 #include "views/widget/native_widget.h"
 #include "views/widget/root_view.h"
 #include "views/widget/tooltip_manager.h"
 #include "views/widget/widget.h"
 #include "views/window/window.h"

 #if defined(OS_WIN)
 #include "base/win/scoped_gdi_object.h"
 #include "views/accessibility/native_view_accessibility_win.h"
 #endif
 #if defined(OS_LINUX)
 #include "ui/base/gtk/scoped_handle_gtk.h"
 #endif

 namespace {
 // Whether to use accelerated compositing when necessary (e.g. when a view has a
 // transformation).
 bool use_acceleration_when_possible = true;

 // Saves the drawing state, and restores the state when going out of scope.
 class ScopedCanvas {
  public:
   explicit ScopedCanvas(gfx::Canvas* canvas) : canvas_(canvas) {
     if (canvas_)
       canvas_->Save();
   }
   ~ScopedCanvas() {
     if (canvas_)
       canvas_->Restore();
   }
   void SetCanvas(gfx::Canvas* canvas) {
     if (canvas_)
       canvas_->Restore();
     canvas_ = canvas;
     canvas_->Save();
   }

  private:
   gfx::Canvas* canvas_;

   DISALLOW_COPY_AND_ASSIGN(ScopedCanvas);
 };

 }

 namespace views {

 // static
 ViewsDelegate* ViewsDelegate::views_delegate = NULL;

 // static
 char View::kViewClassName[] = "views/View";

 ////////////////////////////////////////////////////////////////////////////////
 // View, public:

 // TO BE MOVED -----------------------------------------------------------------

 void View::SetHotTracked(bool flag) {
 }

 bool View::IsHotTracked() const {
   return false;
 }

 // FATE TBD --------------------------------------------------------------------

 Widget* View::child_widget() {
   return NULL;
 }

 // Creation and lifetime -------------------------------------------------------

 View::View()
     : enabled_(true),
       id_(0),
       group_(-1),
       focusable_(false),
       accessibility_focusable_(false),
       is_parent_owned_(true),
       parent_(NULL),
       is_visible_(true),
       registered_for_visible_bounds_notification_(false),
       clip_x_(0.0),
       clip_y_(0.0),
       needs_layout_(true),
       flip_canvas_on_paint_for_rtl_ui_(false),
       texture_id_(0),  // TODO(sadrul): 0 can be a valid texture id.
       accelerator_registration_delayed_(false),
       accelerator_focus_manager_(NULL),
       registered_accelerator_count_(0),
       next_focusable_view_(NULL),
       previous_focusable_view_(NULL),
       context_menu_controller_(NULL),
       drag_controller_(NULL) {
 }

 View::~View() {
   if (parent_)
     parent_->RemoveChildView(this);

   int c = static_cast<int>(children_.size());
   while (--c >= 0) {
     children_[c]->SetParent(NULL);
     if (children_[c]->IsParentOwned())
       delete children_[c];
   }

 #if defined(OS_WIN)
   if (native_view_accessibility_win_.get())
     native_view_accessibility_win_->set_view(NULL);
 #endif
 }

 // Tree operations -------------------------------------------------------------

 const Widget* View::GetWidget() const {
   // The root view holds a reference to this view hierarchy's Widget.
   return parent_ ? parent_->GetWidget() : NULL;
 }

 Widget* View::GetWidget() {
   return const_cast<Widget*>(const_cast<const View*>(this)->GetWidget());
 }

 void View::AddChildView(View* view) {
   AddChildViewAt(view, child_count());
 }

 void View::AddChildViewAt(View* view, int index) {
   CHECK(view != this) << "You cannot add a view as its own child";

   // Remove the view from its current parent if any.
   if (view->parent())
     view->parent()->RemoveChildView(view);

   // Sets the prev/next focus views.
   InitFocusSiblings(view, index);

   // Let's insert the view.
   children_.insert(children_.begin() + index, view);
   view->SetParent(this);

   for (View* p = this; p; p = p->parent())
     p->ViewHierarchyChangedImpl(false, true, this, view);

   view->PropagateAddNotifications(this, view);
   UpdateTooltip();
   if (GetWidget())
     RegisterChildrenForVisibleBoundsNotification(view);

   if (layout_manager_.get())
     layout_manager_->ViewAdded(this, view);
 }

 void View::RemoveChildView(View* view) {
   DoRemoveChildView(view, true, true, false);
 }

 void View::RemoveAllChildViews(bool delete_views) {
   ViewVector::iterator iter;
   while ((iter = children_.begin()) != children_.end())
     DoRemoveChildView(*iter, false, false, delete_views);
   UpdateTooltip();
 }

 const View* View::GetChildViewAt(int index) const {
   return index < child_count() ? children_[index] : NULL;
 }

 View* View::GetChildViewAt(int index) {
   return
       const_cast<View*>(const_cast<const View*>(this)->GetChildViewAt(index));
 }

 bool View::Contains(const View* view) const {
   const View* child = view;
   while (child) {
     if (child == this)
       return true;
     child = child->parent();
   }
   return false;
 }

 int View::GetIndexOf(const View* view) const {
   ViewVector::const_iterator it = std::find(children_.begin(), children_.end(),
                                             view);
   return it != children_.end() ? it - children_.begin() : -1;
 }

 // TODO(beng): remove
 const Window* View::GetWindow() const {
   const Widget* widget = GetWidget();
   return widget ? widget->GetWindow() : NULL;
 }

 // TODO(beng): remove
 Window* View::GetWindow() {
   return const_cast<Window*>(const_cast<const View*>(this)->GetWindow());
 }

 // TODO(beng): remove
 bool View::ContainsNativeView(gfx::NativeView native_view) const {
   for (int i = 0, count = child_count(); i < count; ++i) {
     if (GetChildViewAt(i)->ContainsNativeView(native_view))
       return true;
   }
   return false;
 }

 // TODO(beng): remove
 RootView* View::GetRootView() {
   Widget* widget = GetWidget();
   return widget ? widget->GetRootView() : NULL;
 }

 // Size and disposition --------------------------------------------------------

 void View::SetBounds(int x, int y, int width, int height) {
   SetBoundsRect(gfx::Rect(x, y, std::max(0, width), std::max(0, height)));
 }

 void View::SetBoundsRect(const gfx::Rect& bounds) {
   if (bounds == bounds_) {
     if (needs_layout_) {
       needs_layout_ = false;
       Layout();
       SchedulePaint();
     }
     return;
   }

   gfx::Rect prev = bounds_;
   bounds_ = bounds;
   BoundsChanged(prev);
 }

 void View::SetSize(const gfx::Size& size) {
   SetBounds(x(), y(), size.width(), size.height());
 }

 void View::SetPosition(const gfx::Point& position) {
   SetBounds(position.x(), position.y(), width(), height());
 }

 void View::SetX(int x) {
   SetBounds(x, y(), width(), height());
 }

 void View::SetY(int y) {
   SetBounds(x(), y, width(), height());
 }

 gfx::Rect View::GetContentsBounds() const {
   gfx::Rect contents_bounds(GetLocalBounds());
   if (border_.get()) {
     gfx::Insets insets;
     border_->GetInsets(&insets);
     contents_bounds.Inset(insets);
   }
   return contents_bounds;
 }

 gfx::Rect View::GetLocalBounds() const {
   return gfx::Rect(0, 0, width(), height());
 }

 gfx::Insets View::GetInsets() const {
   gfx::Insets insets;
   if (border_.get())
     border_->GetInsets(&insets);
   return insets;
 }

 gfx::Rect View::GetVisibleBounds() {
   if (!IsVisibleInRootView())
     return gfx::Rect();
   gfx::Rect vis_bounds(0, 0, width(), height());
   gfx::Rect ancestor_bounds;
   View* view = this;
   int root_x = 0;
   int root_y = 0;
   while (view != NULL && !vis_bounds.IsEmpty()) {
     root_x += view->GetMirroredX();
     root_y += view->y();
     vis_bounds.Offset(view->GetMirroredX(), view->y());
     View* ancestor = view->parent();
     if (ancestor != NULL) {
       ancestor_bounds.SetRect(0, 0, ancestor->width(),
         ancestor->height());
       vis_bounds = vis_bounds.Intersect(ancestor_bounds);
     } else if (!view->GetWidget()) {
       // If the view has no Widget, we're not visible. Return an empty rect.
       return gfx::Rect();
     }
     view = ancestor;
   }
   if (vis_bounds.IsEmpty())
     return vis_bounds;
   // Convert back to this views coordinate system.
   vis_bounds.Offset(-root_x, -root_y);
   return vis_bounds;
 }

 gfx::Rect View::GetScreenBounds() const {
   gfx::Point origin;
   View::ConvertPointToScreen(this, &origin);
   return gfx::Rect(origin, size());
 }

 gfx::Size View::GetPreferredSize() {
   if (layout_manager_.get())
     return layout_manager_->GetPreferredSize(this);
   return gfx::Size();
 }

 int View::GetBaseline() {
   return -1;
 }

 void View::SizeToPreferredSize() {
   gfx::Size prefsize = GetPreferredSize();
   if ((prefsize.width() != width()) || (prefsize.height() != height()))
     SetBounds(x(), y(), prefsize.width(), prefsize.height());
 }

 gfx::Size View::GetMinimumSize() {
   return GetPreferredSize();
 }

 int View::GetHeightForWidth(int w) {
   if (layout_manager_.get())
     return layout_manager_->GetPreferredHeightForWidth(this, w);
   return GetPreferredSize().height();
 }

 void View::SetVisible(bool flag) {
   if (flag != is_visible_) {
     // If the tab is currently visible, schedule paint to
     // refresh parent
     if (IsVisible())
       SchedulePaint();

     is_visible_ = flag;

     // This notifies all sub-views recursively.
     PropagateVisibilityNotifications(this, flag);

     // If we are newly visible, schedule paint.
     if (IsVisible())
       SchedulePaint();
   }
 }

 bool View::IsVisible() const {
   return is_visible_;
 }

 bool View::IsVisibleInRootView() const {
   return IsVisible() && parent() ? parent()->IsVisibleInRootView() : false;
 }

 void View::SetEnabled(bool state) {
   if (enabled_ != state) {
     enabled_ = state;
     SchedulePaint();
   }
 }

 bool View::IsEnabled() const {
   return enabled_;
 }

 // Transformations -------------------------------------------------------------

 const ui::Transform& View::GetTransform() const {
   static const ui::Transform* no_op = ui::Transform::Create();
   if (transform_.get())
     return *transform_.get();
   return *no_op;
 }

 void View::SetRotation(float degree) {
   InitTransform();
   transform_->SetRotate(degree);
 }

 void View::SetScaleX(float x) {
   InitTransform();
   transform_->SetScaleX(x);
 }

 void View::SetScaleY(float y) {
   InitTransform();
   transform_->SetScaleY(y);
 }

 void View::SetScale(float x, float y) {
   InitTransform();
   transform_->SetScale(x, y);
 }

 void View::SetTranslateX(float x) {
   InitTransform();
   transform_->SetTranslateX(x);
 }

 void View::SetTranslateY(float y) {
   InitTransform();
   transform_->SetTranslateY(y);
 }

 void View::SetTranslate(float x, float y) {
   InitTransform();
   transform_->SetTranslate(x, y);
 }

 void View::ConcatRotation(float degree) {
   InitTransform();
   transform_->ConcatRotate(degree);
 }

 void View::ConcatScale(float x, float y) {
   InitTransform();
   transform_->ConcatScale(x, y);
 }

 void View::ConcatTranslate(float x, float y) {
   InitTransform();
   transform_->ConcatTranslate(x, y);
 }

 void View::ResetTransform() {
   transform_.reset(NULL);
   clip_x_ = clip_y_ = 0.0;
   canvas_.reset();
 }


 // RTL positioning -------------------------------------------------------------

 gfx::Rect View::GetMirroredBounds() const {
   gfx::Rect bounds(bounds_);
   bounds.set_x(GetMirroredX());
   return bounds;
 }

 gfx::Point View::GetMirroredPosition() const {
   return gfx::Point(GetMirroredX(), y());
 }

 int View::GetMirroredX() const {
   return parent() ? parent()->GetMirroredXForRect(bounds_) : x();
 }

 int View::GetMirroredXForRect(const gfx::Rect& bounds) const {
   return base::i18n::IsRTL() ?
       (width() - bounds.x() - bounds.width()) : bounds.x();
 }

 int View::GetMirroredXInView(int x) const {
   return base::i18n::IsRTL() ? width() - x : x;
 }

 int View::GetMirroredXWithWidthInView(int x, int w) const {
   return base::i18n::IsRTL() ? width() - x - w : x;
 }

 // Layout ----------------------------------------------------------------------

 void View::Layout() {
   needs_layout_ = false;

   // If we have a layout manager, let it handle the layout for us.
   if (layout_manager_.get())
     layout_manager_->Layout(this);

   // Make sure to propagate the Layout() call to any children that haven't
   // received it yet through the layout manager and need to be laid out. This
   // is needed for the case when the child requires a layout but its bounds
   // weren't changed by the layout manager. If there is no layout manager, we
   // just propagate the Layout() call down the hierarchy, so whoever receives
   // the call can take appropriate action.
   for (int i = 0, count = child_count(); i < count; ++i) {
     View* child = GetChildViewAt(i);
     if (child->needs_layout_ || !layout_manager_.get()) {
       child->needs_layout_ = false;
       child->Layout();
     }
   }
 }

 void View::InvalidateLayout() {
   // Always invalidate up. This is needed to handle the case of us already being
   // valid, but not our parent.
   needs_layout_ = true;
   if (parent_)
     parent_->InvalidateLayout();
 }

 LayoutManager* View::GetLayoutManager() const {
   return layout_manager_.get();
 }

 void View::SetLayoutManager(LayoutManager* layout_manager) {
   if (layout_manager_.get())
     layout_manager_->Uninstalled(this);

   layout_manager_.reset(layout_manager);
   if (layout_manager_.get())
     layout_manager_->Installed(this);
 }

 // Attributes ------------------------------------------------------------------

 std::string View::GetClassName() const {
   return kViewClassName;
 }

 View* View::GetAncestorWithClassName(const std::string& name) {
   for (View* view = this; view; view = view->parent()) {
     if (view->GetClassName() == name)
       return view;
   }
   return NULL;
 }

 const View* View::GetViewByID(int id) const {
   if (id == id_)
     return const_cast<View*>(this);

   for (int i = 0, count = child_count(); i < count; ++i) {
     const View* view = GetChildViewAt(i)->GetViewByID(id);
     if (view)
       return view;
   }
   return NULL;
 }

 View* View::GetViewByID(int id) {
   return const_cast<View*>(const_cast<const View*>(this)->GetViewByID(id));
 }

 void View::SetID(int id) {
   id_ = id;
 }

 int View::GetID() const {
   return id_;
 }

 void View::SetGroup(int gid) {
   // Don't change the group id once it's set.
   DCHECK(group_ == -1 || group_ == gid);
   group_ = gid;
 }

 int View::GetGroup() const {
   return group_;
 }

 bool View::IsGroupFocusTraversable() const {
   return true;
 }

 void View::GetViewsWithGroup(int group_id, std::vector<View*>* out) {
   if (group_ == group_id)
     out->push_back(this);

   for (int i = 0, count = child_count(); i < count; ++i)
     GetChildViewAt(i)->GetViewsWithGroup(group_id, out);
 }

 View* View::GetSelectedViewForGroup(int group_id) {
   std::vector<View*> views;
   GetWidget()->GetRootView()->GetViewsWithGroup(group_id, &views);
   return views.empty() ? NULL : views[0];
 }

 // Coordinate conversion -------------------------------------------------------

 // static
 void View::ConvertPointToView(const View* src,
                               const View* dst,
                               gfx::Point* point) {
   ConvertPointToView(src, dst, point, true);
 }

 // static
 void View::ConvertPointToWidget(const View* src, gfx::Point* p) {
   DCHECK(src);
   DCHECK(p);

   src->ConvertPointForAncestor(NULL, p);
 }

 // static
 void View::ConvertPointFromWidget(const View* dest, gfx::Point* p) {
   DCHECK(dest);
   DCHECK(p);

   dest->ConvertPointFromAncestor(NULL, p);
 }

 // static
 void View::ConvertPointToScreen(const View* src, gfx::Point* p) {
   DCHECK(src);
   DCHECK(p);

   // If the view is not connected to a tree, there's nothing we can do.
   const Widget* widget = src->GetWidget();
   if (widget) {
     ConvertPointToWidget(src, p);
     gfx::Rect r = widget->GetClientAreaScreenBounds();
     p->SetPoint(p->x() + r.x(), p->y() + r.y());
   }
 }

 gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const {
   if (!transform_.get() || !transform_->HasChange())
     return rect;
   gfx::Rect x_rect = rect;
   transform_->TransformRect(&x_rect);
   return x_rect;
 }

 // Painting --------------------------------------------------------------------

 void View::SchedulePaint() {
   SchedulePaintInRect(GetLocalBounds());
 }

 void View::SchedulePaintInRect(const gfx::Rect& rect) {
   if (!IsVisible())
     return;

   if (parent_) {
     // Translate the requested paint rect to the parent's coordinate system
     // then pass this notification up to the parent.
     gfx::Rect paint_rect = ConvertRectToParent(rect);
     paint_rect.Offset(GetMirroredPosition());
     parent_->SchedulePaintInRect(paint_rect);
   }
 }

 void View::Paint(gfx::Canvas* canvas) {
   if (!IsVisible())
     return;

   ScopedCanvas scoped_canvas(NULL);
   if (use_acceleration_when_possible &&
       transform_.get() && transform_->HasChange()) {
     // This view has a transformation. So this maintains its own canvas.
     if (!canvas_.get())
       canvas_.reset(gfx::Canvas::CreateCanvas(width(), height(), false));

     canvas = canvas_.get();
   } else {
     // We're going to modify the canvas, save its state first.
     scoped_canvas.SetCanvas(canvas);

     // Paint this View and its children, setting the clip rect to the bounds
     // of this View and translating the origin to the local bounds' top left
     // point.
     //
     // Note that the X (or left) position we pass to ClipRectInt takes into
     // consideration whether or not the view uses a right-to-left layout so that
     // we paint our view in its mirrored position if need be.
     if (!canvas->ClipRectInt(GetMirroredX(), y(),
                             width() - static_cast<int>(clip_x_),
                             height() - static_cast<int>(clip_y_))) {
       return;
     }
     // Non-empty clip, translate the graphics such that 0,0 corresponds to
     // where this view is located (related to its parent).
     canvas->TranslateInt(GetMirroredX(), y());

     if (transform_.get() && transform_->HasChange())
       canvas->Transform(*transform_.get());
   }

   {
     // If the View we are about to paint requested the canvas to be flipped, we
     // should change the transform appropriately.
     // The canvas mirroring is undone once the View is done painting so that we
     // don't pass the canvas with the mirrored transform to Views that didn't
     // request the canvas to be flipped.

     ScopedCanvas scoped(canvas);
     if (FlipCanvasOnPaintForRTLUI()) {
       canvas->TranslateInt(width(), 0);
       canvas->ScaleInt(-1, 1);
     }

     OnPaint(canvas);
   }

   PaintChildren(canvas);

   if (canvas == canvas_.get()) {
     texture_id_ = canvas->GetTextureID();

     // TODO(sadrul): Make sure the Widget's compositor tree updates itself?
   }
 }

 void View::PaintNow() {
   if (!IsVisible())
     return;

   if (parent())
     parent()->PaintNow();
 }


 ThemeProvider* View::GetThemeProvider() const {
   const Widget* widget = GetWidget();
   return widget ? widget->GetThemeProvider() : NULL;
 }

 // Accelerated Painting --------------------------------------------------------

 // static
 void View::set_use_acceleration_when_possible(bool use) {
   use_acceleration_when_possible = use;
 }

 // Input -----------------------------------------------------------------------

 View* View::GetEventHandlerForPoint(const gfx::Point& point) {
   // Walk the child Views recursively looking for the View that most
   // tightly encloses the specified point.
   for (int i = child_count() - 1; i >= 0; --i) {
     View* child = GetChildViewAt(i);
     if (!child->IsVisible())
       continue;

     gfx::Point point_in_child_coords(point);
     View::ConvertPointToView(this, child, &point_in_child_coords);
     if (child->HitTest(point_in_child_coords))
       return child->GetEventHandlerForPoint(point_in_child_coords);
   }
   return this;
 }

 gfx::NativeCursor View::GetCursorForPoint(ui::EventType event_type,
                                           const gfx::Point& p) {
   return NULL;
 }

 bool View::HitTest(const gfx::Point& l) const {
   if (l.x() >= 0 && l.x() < width() && l.y() >= 0 && l.y() < height()) {
     if (HasHitTestMask()) {
       gfx::Path mask;
       GetHitTestMask(&mask);
       // TODO: can this use SkRegion's contains instead?
 #if defined(OS_WIN)
       base::win::ScopedRegion rgn(mask.CreateNativeRegion());
       return !!PtInRegion(rgn, l.x(), l.y());
 #elif defined(TOOLKIT_USES_GTK)
       ui::ScopedRegion rgn(mask.CreateNativeRegion());
       return gdk_region_point_in(rgn.Get(), l.x(), l.y());
 #endif
     }
     // No mask, but inside our bounds.
     return true;
   }
   // Outside our bounds.
   return false;
 }

 bool View::OnMousePressed(const MouseEvent& event) {
   return false;
 }

 bool View::OnMouseDragged(const MouseEvent& event) {
   return false;
 }

 void View::OnMouseReleased(const MouseEvent& event, bool canceled) {
 }

 void View::OnMouseMoved(const MouseEvent& event) {
 }

 void View::OnMouseEntered(const MouseEvent& event) {
 }

 void View::OnMouseExited(const MouseEvent& event) {
 }

 #if defined(TOUCH_UI)
 View::TouchStatus View::OnTouchEvent(const TouchEvent& event) {
   DVLOG(1) << "visited the OnTouchEvent";
   return TOUCH_STATUS_UNKNOWN;
 }
 #endif

 void View::SetMouseHandler(View *new_mouse_handler) {
   // It is valid for new_mouse_handler to be NULL
   if (parent_)
     parent_->SetMouseHandler(new_mouse_handler);
 }

 bool View::OnKeyPressed(const KeyEvent& event) {
   return false;
 }

 bool View::OnKeyReleased(const KeyEvent& event) {
   return false;
 }

 bool View::OnMouseWheel(const MouseWheelEvent& event) {
   return false;
 }

 // Accelerators ----------------------------------------------------------------

 void View::AddAccelerator(const Accelerator& accelerator) {
   if (!accelerators_.get())
     accelerators_.reset(new std::vector<Accelerator>());

   std::vector<Accelerator>::iterator iter =
       std::find(accelerators_->begin(), accelerators_->end(), accelerator);
   DCHECK(iter == accelerators_->end())
       << "Registering the same accelerator multiple times";

   accelerators_->push_back(accelerator);
   RegisterPendingAccelerators();
 }

 void View::RemoveAccelerator(const Accelerator& accelerator) {
   std::vector<Accelerator>::iterator iter;
   if (!accelerators_.get() ||
       ((iter = std::find(accelerators_->begin(), accelerators_->end(),
           accelerator)) == accelerators_->end())) {
     NOTREACHED() << "Removing non-existing accelerator";
     return;
   }

   size_t index = iter - accelerators_->begin();
   accelerators_->erase(iter);
   if (index >= registered_accelerator_count_) {
     // The accelerator is not registered to FocusManager.
     return;
   }
   --registered_accelerator_count_;

   // Providing we are attached to a Widget and registered with a focus manager,
   // we should de-register from that focus manager now.
   if (GetWidget() && accelerator_focus_manager_)
     accelerator_focus_manager_->UnregisterAccelerator(accelerator, this);
 }

 void View::ResetAccelerators() {
   if (accelerators_.get())
     UnregisterAccelerators(false);
 }

 bool View::AcceleratorPressed(const Accelerator& accelerator) {
   return false;
 }

 // Focus -----------------------------------------------------------------------

 bool View::HasFocus() {
   FocusManager* focus_manager = GetFocusManager();
   if (focus_manager)
     return focus_manager->GetFocusedView() == this;
   return false;
 }

 View* View::GetNextFocusableView() {
   return next_focusable_view_;
 }

 const View* View::GetNextFocusableView() const {
   return next_focusable_view_;
 }

 View* View::GetPreviousFocusableView() {
   return previous_focusable_view_;
 }

 void View::SetNextFocusableView(View* view) {
   view->previous_focusable_view_ = this;
   next_focusable_view_ = view;
 }

 void View::SetFocusable(bool focusable) {
   focusable_ = focusable;
 }

 bool View::IsFocusableInRootView() const {
   return IsFocusable() && IsVisibleInRootView();
 }

 bool View::IsAccessibilityFocusableInRootView() const {
   return (focusable_ || accessibility_focusable_) && IsEnabled() &&
     IsVisibleInRootView();
 }

 void View::set_accessibility_focusable(bool accessibility_focusable) {
   accessibility_focusable_ = accessibility_focusable;
 }

 FocusManager* View::GetFocusManager() {
   Widget* widget = GetWidget();
   return widget ? widget->GetFocusManager() : NULL;
 }

 void View::RequestFocus() {
   FocusManager* focus_manager = GetFocusManager();
   if (focus_manager && IsFocusableInRootView())
     focus_manager->SetFocusedView(this);
 }

 bool View::SkipDefaultKeyEventProcessing(const KeyEvent& event) {
   return false;
 }

 FocusTraversable* View::GetFocusTraversable() {
   return NULL;
 }

 FocusTraversable* View::GetPaneFocusTraversable() {
   return NULL;
 }

 // Tooltips --------------------------------------------------------------------

 bool View::GetTooltipText(const gfx::Point& p, std::wstring* tooltip) {
   return false;
 }

 bool View::GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) {
   return false;
 }

 // Context menus ---------------------------------------------------------------

 void View::SetContextMenuController(ContextMenuController* menu_controller) {
   context_menu_controller_ = menu_controller;
 }

 void View::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
   if (!context_menu_controller_)
     return;

   context_menu_controller_->ShowContextMenuForView(this, p, is_mouse_gesture);
 }

 // Drag and drop ---------------------------------------------------------------

 void View::SetDragController(DragController* drag_controller) {
   drag_controller_ = drag_controller;
 }

 DragController* View::GetDragController() {
   return drag_controller_;
 }

 bool View::GetDropFormats(
       int* formats,
       std::set<OSExchangeData::CustomFormat>* custom_formats) {
   return false;
 }

 bool View::AreDropTypesRequired() {
   return false;
 }

 bool View::CanDrop(const OSExchangeData& data) {
   // TODO(sky): when I finish up migration, this should default to true.
   return false;
 }

 void View::OnDragEntered(const DropTargetEvent& event) {
 }

 int View::OnDragUpdated(const DropTargetEvent& event) {
   return ui::DragDropTypes::DRAG_NONE;
 }

 void View::OnDragExited() {
 }

 int View::OnPerformDrop(const DropTargetEvent& event) {
   return ui::DragDropTypes::DRAG_NONE;
 }

 void View::OnDragDone() {
 }

 // static
 bool View::ExceededDragThreshold(int delta_x, int delta_y) {
   return (abs(delta_x) > GetHorizontalDragThreshold() ||
           abs(delta_y) > GetVerticalDragThreshold());
 }

 // Scrolling -------------------------------------------------------------------

 void View::ScrollRectToVisible(const gfx::Rect& rect) {
   // We must take RTL UI mirroring into account when adjusting the position of
   // the region.
   if (parent()) {
     gfx::Rect scroll_rect(rect);
     scroll_rect.Offset(GetMirroredX(), y());
     parent()->ScrollRectToVisible(scroll_rect);
   }
 }

 int View::GetPageScrollIncrement(ScrollView* scroll_view,
                                  bool is_horizontal, bool is_positive) {
   return 0;
 }

 int View::GetLineScrollIncrement(ScrollView* scroll_view,
                                  bool is_horizontal, bool is_positive) {
   return 0;
 }

 ////////////////////////////////////////////////////////////////////////////////
 // View, protected:

 // Size and disposition --------------------------------------------------------

 void View::OnBoundsChanged(const gfx::Rect& previous_bounds) {
 }

 void View::PreferredSizeChanged() {
   InvalidateLayout();
   if (parent_)
     parent_->ChildPreferredSizeChanged(this);
 }

 bool View::NeedsNotificationWhenVisibleBoundsChange() const {
   return false;
 }

 void View::OnVisibleBoundsChanged() {
 }

 // Tree operations -------------------------------------------------------------

 void View::ViewHierarchyChanged(bool is_add, View* parent, View* child) {
 }

 void View::VisibilityChanged(View* starting_from, bool is_visible) {
 }

 void View::NativeViewHierarchyChanged(bool attached,
                                       gfx::NativeView native_view,
                                       RootView* root_view) {
   FocusManager* focus_manager = GetFocusManager();
   if (!accelerator_registration_delayed_ &&
       accelerator_focus_manager_ &&
       accelerator_focus_manager_ != focus_manager) {
     UnregisterAccelerators(true);
     accelerator_registration_delayed_ = true;
   }
   if (accelerator_registration_delayed_ && attached) {
     if (focus_manager) {
       RegisterPendingAccelerators();
       accelerator_registration_delayed_ = false;
     }
   }
 }

 // Painting --------------------------------------------------------------------

 void View::PaintChildren(gfx::Canvas* canvas) {
   for (int i = 0, count = child_count(); i < count; ++i) {
     View* child = GetChildViewAt(i);
     if (!child) {
       NOTREACHED() << "Should not have a NULL child View for index in bounds";
       continue;
     }
     child->Paint(canvas);
   }
 }

 void View::OnPaint(gfx::Canvas* canvas) {
   OnPaintBackground(canvas);
   OnPaintFocusBorder(canvas);
   OnPaintBorder(canvas);
 }

 void View::OnPaintBackground(gfx::Canvas* canvas) {
   if (background_.get())
     background_->Paint(canvas, this);
 }

 void View::OnPaintBorder(gfx::Canvas* canvas) {
   if (border_.get())
     border_->Paint(*this, canvas);
 }

 void View::OnPaintFocusBorder(gfx::Canvas* canvas) {
   if (HasFocus() && (IsFocusable() || IsAccessibilityFocusableInRootView()))
     canvas->DrawFocusRect(0, 0, width(), height());
 }

 // Accelerated Painting --------------------------------------------------------

 void View::PaintComposite(ui::Compositor* compositor) {
   compositor->SaveTransform();

   // TODO(sad): Push a transform matrix for the offset and bounds of the view?
   if (texture_id_)
     compositor->DrawTextureWithTransform(texture_id_, GetTransform());

   for (int i = 0, count = child_count(); i < count; ++i) {
     View* child = GetChildViewAt(i);
     child->PaintComposite(compositor);
   }

   compositor->RestoreTransform();
 }

 // Input -----------------------------------------------------------------------

 bool View::HasHitTestMask() const {
   return false;
 }

 void View::GetHitTestMask(gfx::Path* mask) const {
   DCHECK(mask);
 }

 // Focus -----------------------------------------------------------------------

 bool View::IsFocusable() const {
   return focusable_ && IsEnabled() && IsVisible();
 }

 void View::OnFocus() {
   // TODO(beng): Investigate whether it's possible for us to move this to
   //             Focus().
   // By default, we clear the native focus. This ensures that no visible native
   // view as the focus and that we still receive keyboard inputs.
   FocusManager* focus_manager = GetFocusManager();
   if (focus_manager)
     focus_manager->ClearNativeFocus();

   // TODO(beng): Investigate whether it's possible for us to move this to
   //             Focus().
   // Notify assistive technologies of the focus change.
   GetWidget()->NotifyAccessibilityEvent(
       this, ui::AccessibilityTypes::EVENT_FOCUS, true);
 }

 void View::OnBlur() {
 }

 void View::Focus() {
   SchedulePaint();
   OnFocus();
 }

 void View::Blur() {
   SchedulePaint();
   OnBlur();
 }

 // Tooltips --------------------------------------------------------------------

 void View::TooltipTextChanged() {
   Widget* widget = GetWidget();
   if (widget)
     widget->native_widget()->GetTooltipManager()->TooltipTextChanged(this);
 }

 // Context menus ---------------------------------------------------------------

 gfx::Point View::GetKeyboardContextMenuLocation() {
   gfx::Rect vis_bounds = GetVisibleBounds();
   gfx::Point screen_point(vis_bounds.x() + vis_bounds.width() / 2,
                           vis_bounds.y() + vis_bounds.height() / 2);
   ConvertPointToScreen(this, &screen_point);
   return screen_point;
 }

 // Drag and drop ---------------------------------------------------------------

 int View::GetDragOperations(const gfx::Point& press_pt) {
   return drag_controller_ ?
       drag_controller_->GetDragOperationsForView(this, press_pt) :
       ui::DragDropTypes::DRAG_NONE;
 }

 void View::WriteDragData(const gfx::Point& press_pt, OSExchangeData* data) {
   DCHECK(drag_controller_);
   drag_controller_->WriteDragDataForView(this, press_pt, data);
 }

 bool View::InDrag() {
   Widget* widget = GetWidget();
   return widget ? widget->dragged_view() == this : false;
 }

 ////////////////////////////////////////////////////////////////////////////////
 // View, private:

 // DropInfo --------------------------------------------------------------------

 void View::DragInfo::Reset() {
   possible_drag = false;
   start_pt = gfx::Point();
 }

 void View::DragInfo::PossibleDrag(const gfx::Point& p) {
   possible_drag = true;
   start_pt = p;
 }

 // Tree operations -------------------------------------------------------------

 void View::DoRemoveChildView(View* view,
                              bool update_focus_cycle,
                              bool update_tool_tip,
                              bool delete_removed_view) {
   DCHECK(view);
   const ViewVector::iterator i = find(children_.begin(), children_.end(), view);
   scoped_ptr<View> view_to_be_deleted;
   if (i != children_.end()) {
     if (update_focus_cycle) {
       // Let's remove the view from the focus traversal.
       View* next_focusable = view->next_focusable_view_;
       View* prev_focusable = view->previous_focusable_view_;
       if (prev_focusable)
         prev_focusable->next_focusable_view_ = next_focusable;
       if (next_focusable)
         next_focusable->previous_focusable_view_ = prev_focusable;
     }

     if (GetWidget())
       UnregisterChildrenForVisibleBoundsNotification(view);
     view->PropagateRemoveNotifications(this);
     view->SetParent(NULL);

     if (delete_removed_view && view->IsParentOwned())
       view_to_be_deleted.reset(view);

     children_.erase(i);
   }

   if (update_tool_tip)
     UpdateTooltip();

   if (layout_manager_.get())
     layout_manager_->ViewRemoved(this, view);
 }

 void View::SetParent(View* parent) {
   if (parent != parent_)
     parent_ = parent;
 }

 void View::PropagateRemoveNotifications(View* parent) {
   for (int i = 0, count = child_count(); i < count; ++i)
     GetChildViewAt(i)->PropagateRemoveNotifications(parent);

   for (View* v = this; v; v = v->parent())
     v->ViewHierarchyChangedImpl(true, false, parent, this);
 }

 void View::PropagateAddNotifications(View* parent, View* child) {
   for (int i = 0, count = child_count(); i < count; ++i)
     GetChildViewAt(i)->PropagateAddNotifications(parent, child);
   ViewHierarchyChangedImpl(true, true, parent, child);
 }

 void View::PropagateNativeViewHierarchyChanged(bool attached,
                                                gfx::NativeView native_view,
                                                RootView* root_view) {
   for (int i = 0, count = child_count(); i < count; ++i)
     GetChildViewAt(i)->PropagateNativeViewHierarchyChanged(attached,
                                                            native_view,
                                                            root_view);
   NativeViewHierarchyChanged(attached, native_view, root_view);
 }

 void View::ViewHierarchyChangedImpl(bool register_accelerators,
                                     bool is_add,
                                     View* parent,
                                     View* child) {
   if (register_accelerators) {
     if (is_add) {
       // If you get this registration, you are part of a subtree that has been
       // added to the view hierarchy.
       if (GetFocusManager()) {
         RegisterPendingAccelerators();
       } else {
         // Delay accelerator registration until visible as we do not have
         // focus manager until then.
         accelerator_registration_delayed_ = true;
       }
     } else {
       if (child == this)
         UnregisterAccelerators(true);
     }
   }

   ViewHierarchyChanged(is_add, parent, child);
   parent->needs_layout_ = true;
 }

 // Size and disposition --------------------------------------------------------

 void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
   for (int i = 0, count = child_count(); i < count; ++i)
     GetChildViewAt(i)->PropagateVisibilityNotifications(start, is_visible);
   VisibilityChangedImpl(start, is_visible);
 }

 void View::VisibilityChangedImpl(View* starting_from, bool is_visible) {
   if (is_visible)
     RegisterPendingAccelerators();
   else
     UnregisterAccelerators(true);
   VisibilityChanged(starting_from, is_visible);
 }

 void View::BoundsChanged(const gfx::Rect& previous_bounds) {
   if (canvas_.get())
     canvas_.reset(gfx::Canvas::CreateCanvas(width(), height(), false));

   if (parent_) {
     parent_->SchedulePaintInRect(previous_bounds);
     parent_->SchedulePaintInRect(bounds_);
   } else {
     // Previous bounds has no meaning to an orphan. This should only happen
     // when the View is a RootView.
     SchedulePaintInRect(gfx::Rect(0, 0, bounds_.width(), bounds_.height()));
   }

   OnBoundsChanged(previous_bounds);

   if (previous_bounds.size() != size()) {
     needs_layout_ = false;
     Layout();
   }

   // Notify interested Views that visible bounds within the root view may have
   // changed.
   if (descendants_to_notify_.get()) {
     for (std::vector<View*>::iterator i = descendants_to_notify_->begin();
          i != descendants_to_notify_->end(); ++i) {
       (*i)->OnVisibleBoundsChanged();
     }
   }
 }

 // static
 void View::RegisterChildrenForVisibleBoundsNotification(View* view) {
   if (view->NeedsNotificationWhenVisibleBoundsChange())
     view->RegisterForVisibleBoundsNotification();
   for (int i = 0; i < view->child_count(); ++i)
     RegisterChildrenForVisibleBoundsNotification(view->GetChildViewAt(i));
 }

 // static
 void View::UnregisterChildrenForVisibleBoundsNotification(View* view) {
   if (view->NeedsNotificationWhenVisibleBoundsChange())
     view->UnregisterForVisibleBoundsNotification();
   for (int i = 0; i < view->child_count(); ++i)
     UnregisterChildrenForVisibleBoundsNotification(view->GetChildViewAt(i));
 }

 void View::RegisterForVisibleBoundsNotification() {
   if (registered_for_visible_bounds_notification_)
     return;
   registered_for_visible_bounds_notification_ = true;
   View* ancestor = parent();
   while (ancestor) {
     ancestor->AddDescendantToNotify(this);
     ancestor = ancestor->parent();
   }
 }

 void View::UnregisterForVisibleBoundsNotification() {
   if (!registered_for_visible_bounds_notification_)
     return;
   registered_for_visible_bounds_notification_ = false;
   View* ancestor = parent();
   while (ancestor) {
     ancestor->RemoveDescendantToNotify(this);
     ancestor = ancestor->parent();
   }
 }

 void View::AddDescendantToNotify(View* view) {
   DCHECK(view);
   if (!descendants_to_notify_.get())
     descendants_to_notify_.reset(new ViewVector);
   descendants_to_notify_->push_back(view);
 }

 void View::RemoveDescendantToNotify(View* view) {
   DCHECK(view && descendants_to_notify_.get());
   ViewVector::iterator i = find(descendants_to_notify_->begin(),
                                 descendants_to_notify_->end(),
                                 view);
   DCHECK(i != descendants_to_notify_->end());
   descendants_to_notify_->erase(i);
   if (descendants_to_notify_->empty())
     descendants_to_notify_.reset();
 }

 // Transformations -------------------------------------------------------------

 void View::InitTransform() {
   if (!transform_.get())
     transform_.reset(ui::Transform::Create());
 }

 // Coordinate conversion -------------------------------------------------------

 // static
 void View::ConvertPointToView(const View* src,
                               const View* dst,
                               gfx::Point* point,
                               bool try_other_direction) {
   // src can be NULL
   DCHECK(dst);
   DCHECK(point);

   if (src == NULL || src->Contains(dst)) {
     dst->ConvertPointFromAncestor(src, point);
     if (!src) {
       const Widget* widget = dst->GetWidget();
       if (widget) {
         gfx::Rect b = widget->GetClientAreaScreenBounds();
         point->SetPoint(point->x() - b.x(), point->y() - b.y());
       }
     }
   } else if (src && try_other_direction) {
     if (!src->ConvertPointForAncestor(dst, point)) {
       // |src| is not an ancestor of |dst|, and |dst| is not an ancestor of
       // |src| either. At this stage, |point| is in the widget's coordinate
       // system. So convert from the widget's to |dst|'s coordinate system now.
       ConvertPointFromWidget(dst, point);
     }
   }
 }

 bool View::ConvertPointForAncestor(const View* ancestor,
                                    gfx::Point* point) const {
   scoped_ptr<ui::Transform> trans(ui::Transform::Create());

   // TODO(sad): Have some way of caching the transformation results.

   const View* v = this;
   for (; v && v != ancestor; v = v->parent()) {
     if (v->GetTransform().HasChange()) {
       if (!trans->ConcatTransform(v->GetTransform()))
         return false;
     }
     trans->ConcatTranslate(static_cast<float>(v->GetMirroredX()),
                            static_cast<float>(v->y()));
   }

   if (trans->HasChange()) {
     trans->TransformPoint(point);
   }

   return v == ancestor;
 }

 bool View::ConvertPointFromAncestor(const View* ancestor,
                                     gfx::Point* point) const {
   scoped_ptr<ui::Transform> trans(ui::Transform::Create());

   const View* v = this;
   for (; v && v != ancestor; v = v->parent()) {
     if (v->GetTransform().HasChange()) {
       if (!trans->ConcatTransform(v->GetTransform()))
         return false;
     }
     trans->ConcatTranslate(static_cast<float>(v->GetMirroredX()),
                            static_cast<float>(v->y()));
   }

   if (trans->HasChange()) {
     trans->TransformPointReverse(point);
   }

   return v == ancestor;
 }

 // Input -----------------------------------------------------------------------

 bool View::ProcessMousePressed(const MouseEvent& event, DragInfo* drag_info) {
   const bool enabled = IsEnabled();
   int drag_operations =
       (enabled && event.IsOnlyLeftMouseButton() && HitTest(event.location())) ?
       GetDragOperations(event.location()) : 0;
   ContextMenuController* context_menu_controller = event.IsRightMouseButton() ?
       context_menu_controller_ : 0;

   const bool result = OnMousePressed(event);
   // WARNING: we may have been deleted, don't use any View variables.

   if (!enabled)
     return result;

   if (drag_operations != ui::DragDropTypes::DRAG_NONE) {
     drag_info->PossibleDrag(event.location());
     return true;
   }
   return !!context_menu_controller || result;
 }

 bool View::ProcessMouseDragged(const MouseEvent& event, DragInfo* drag_info) {
   // Copy the field, that way if we're deleted after drag and drop no harm is
   // done.
   ContextMenuController* context_menu_controller = context_menu_controller_;
   const bool possible_drag = drag_info->possible_drag;
   if (possible_drag && ExceededDragThreshold(
       drag_info->start_pt.x() - event.x(),
       drag_info->start_pt.y() - event.y())) {
     if (!drag_controller_ ||
         drag_controller_->CanStartDragForView(
             this, drag_info->start_pt, event.location()))
       DoDrag(event, drag_info->start_pt);
   } else {
     if (OnMouseDragged(event))
       return true;
     // Fall through to return value based on context menu controller.
   }
   // WARNING: we may have been deleted.
   return (context_menu_controller != NULL) || possible_drag;
 }

 void View::ProcessMouseReleased(const MouseEvent& event, bool canceled) {
   if (!canceled && context_menu_controller_ && event.IsOnlyRightMouseButton()) {
     // Assume that if there is a context menu controller we won't be deleted
     // from mouse released.
     gfx::Point location(event.location());
     OnMouseReleased(event, canceled);
     if (HitTest(location)) {
       ConvertPointToScreen(this, &location);
       ShowContextMenu(location, true);
     }
   } else {
     OnMouseReleased(event, canceled);
   }
   // WARNING: we may have been deleted.
 }

 #if defined(TOUCH_UI)
 View::TouchStatus View::ProcessTouchEvent(const TouchEvent& event) {
   // TODO(rjkroege): Implement a grab scheme similar to as
   // as is found in MousePressed.
   return OnTouchEvent(event);
 }
 #endif

 // Accelerators ----------------------------------------------------------------

 void View::RegisterPendingAccelerators() {
   if (!accelerators_.get() ||
       registered_accelerator_count_ == accelerators_->size()) {
     // No accelerators are waiting for registration.
     return;
   }

   if (!GetWidget()) {
     // The view is not yet attached to a widget, defer registration until then.
     return;
   }

   accelerator_focus_manager_ = GetFocusManager();
   if (!accelerator_focus_manager_) {
     // Some crash reports seem to show that we may get cases where we have no
     // focus manager (see bug #1291225).  This should never be the case, just
     // making sure we don't crash.

     // TODO(jcampan): This fails for a view under WidgetGtk with TYPE_CHILD.
     // (see http://crbug.com/21335) reenable NOTREACHED assertion and
     // verify accelerators works as expected.
 #if defined(OS_WIN)
     NOTREACHED();
 #endif
     return;
   }
   // Only register accelerators if we are visible.
   if (!IsVisibleInRootView())
     return;
   std::vector<Accelerator>::const_iterator iter;
   for (iter = accelerators_->begin() + registered_accelerator_count_;
        iter != accelerators_->end(); ++iter) {
     accelerator_focus_manager_->RegisterAccelerator(*iter, this);
   }
   registered_accelerator_count_ = accelerators_->size();
 }

 void View::UnregisterAccelerators(bool leave_data_intact) {
   if (!accelerators_.get())
     return;

   if (GetWidget()) {
     if (accelerator_focus_manager_) {
       // We may not have a FocusManager if the window containing us is being
       // closed, in which case the FocusManager is being deleted so there is
       // nothing to unregister.
       accelerator_focus_manager_->UnregisterAccelerators(this);
       accelerator_focus_manager_ = NULL;
     }
     if (!leave_data_intact) {
       accelerators_->clear();
       accelerators_.reset();
     }
     registered_accelerator_count_ = 0;
   }
 }

 // Focus -----------------------------------------------------------------------

 void View::InitFocusSiblings(View* v, int index) {
   int child_count = static_cast<int>(children_.size());

   if (child_count == 0) {
     v->next_focusable_view_ = NULL;
     v->previous_focusable_view_ = NULL;
   } else {
     if (index == child_count) {
       // We are inserting at the end, but the end of the child list may not be
       // the last focusable element. Let's try to find an element with no next
       // focusable element to link to.
       View* last_focusable_view = NULL;
       for (std::vector<View*>::iterator iter = children_.begin();
            iter != children_.end(); ++iter) {
           if (!(*iter)->next_focusable_view_) {
             last_focusable_view = *iter;
             break;
           }
       }
       if (last_focusable_view == NULL) {
         // Hum... there is a cycle in the focus list. Let's just insert ourself
         // after the last child.
         View* prev = children_[index - 1];
         v->previous_focusable_view_ = prev;
         v->next_focusable_view_ = prev->next_focusable_view_;
         prev->next_focusable_view_->previous_focusable_view_ = v;
         prev->next_focusable_view_ = v;
       } else {
         last_focusable_view->next_focusable_view_ = v;
         v->next_focusable_view_ = NULL;
         v->previous_focusable_view_ = last_focusable_view;
       }
     } else {
       View* prev = children_[index]->GetPreviousFocusableView();
       v->previous_focusable_view_ = prev;
       v->next_focusable_view_ = children_[index];
       if (prev)
         prev->next_focusable_view_ = v;
       children_[index]->previous_focusable_view_ = v;
     }
   }
 }

 // System events ---------------------------------------------------------------

 void View::PropagateThemeChanged() {
   for (int i = child_count() - 1; i >= 0; --i)
     GetChildViewAt(i)->PropagateThemeChanged();
   OnThemeChanged();
 }

 void View::PropagateLocaleChanged() {
   for (int i = child_count() - 1; i >= 0; --i)
     GetChildViewAt(i)->PropagateLocaleChanged();
   OnLocaleChanged();
 }

 // Tooltips --------------------------------------------------------------------

 void View::UpdateTooltip() {
   Widget* widget = GetWidget();
   // TODO(beng): The TooltipManager NULL check can be removed when we
   //             consolidate Init() methods and make views_unittests Init() all
   //             Widgets that it uses.
   if (widget && widget->native_widget()->GetTooltipManager())
     widget->native_widget()->GetTooltipManager()->UpdateTooltip();
 }

 // Drag and drop ---------------------------------------------------------------

 void View::DoDrag(const MouseEvent& event, const gfx::Point& press_pt) {
   int drag_operations = GetDragOperations(press_pt);
   if (drag_operations == ui::DragDropTypes::DRAG_NONE)
     return;

   OSExchangeData data;
   WriteDragData(press_pt, &data);

   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   GetWidget()->RunShellDrag(this, data, drag_operations);
 }

 }  // namespace views