ui/views/view.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
   6
   7 #include "ui/views/view.h"
   8
   9 #include <algorithm>
  10 #include <cmath>
  11
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "base/strings/stringprintf.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/trace_event/trace_event.h"
  18 #include "third_party/skia/include/core/SkRect.h"
  19 #include "ui/accessibility/ax_enums.h"
  20 #include "ui/base/cursor/cursor.h"
  21 #include "ui/base/dragdrop/drag_drop_types.h"
  22 #include "ui/compositor/clip_transform_recorder.h"
  23 #include "ui/compositor/compositor.h"
  24 #include "ui/compositor/dip_util.h"
  25 #include "ui/compositor/layer.h"
  26 #include "ui/compositor/layer_animator.h"
  27 #include "ui/compositor/paint_context.h"
  28 #include "ui/compositor/paint_recorder.h"
  29 #include "ui/events/event_target_iterator.h"
  30 #include "ui/gfx/canvas.h"
  31 #include "ui/gfx/geometry/point3_f.h"
  32 #include "ui/gfx/geometry/point_conversions.h"
  33 #include "ui/gfx/interpolated_transform.h"
  34 #include "ui/gfx/path.h"
  35 #include "ui/gfx/scoped_canvas.h"
  36 #include "ui/gfx/screen.h"
  37 #include "ui/gfx/skia_util.h"
  38 #include "ui/gfx/transform.h"
  39 #include "ui/native_theme/native_theme.h"
  40 #include "ui/views/accessibility/native_view_accessibility.h"
  41 #include "ui/views/background.h"
  42 #include "ui/views/border.h"
  43 #include "ui/views/context_menu_controller.h"
  44 #include "ui/views/drag_controller.h"
  45 #include "ui/views/focus/view_storage.h"
  46 #include "ui/views/layout/layout_manager.h"
  47 #include "ui/views/views_delegate.h"
  48 #include "ui/views/widget/native_widget_private.h"
  49 #include "ui/views/widget/root_view.h"
  50 #include "ui/views/widget/tooltip_manager.h"
  51 #include "ui/views/widget/widget.h"
  52
  53 #if defined(OS_WIN)
  54 #include "base/win/scoped_gdi_object.h"
  55 #endif
  56
  57 namespace views {
  58
  59 namespace {
  60
  61 #if defined(OS_WIN)
  62 const bool kContextMenuOnMousePress = false;
  63 #else
  64 const bool kContextMenuOnMousePress = true;
  65 #endif
  66
  67 // Default horizontal drag threshold in pixels.
  68 // Same as what gtk uses.
  69 const int kDefaultHorizontalDragThreshold = 8;
  70
  71 // Default vertical drag threshold in pixels.
  72 // Same as what gtk uses.
  73 const int kDefaultVerticalDragThreshold = 8;
  74
  75 // Returns the top view in |view|'s hierarchy.
  76 const View* GetHierarchyRoot(const View* view) {
  77   const View* root = view;
  78   while (root && root->parent())
  79     root = root->parent();
  80   return root;
  81 }
  82
  83 }  // namespace
  84
  85 // static
  86 ViewsDelegate* ViewsDelegate::views_delegate = NULL;
  87
  88 // static
  89 const char View::kViewClassName[] = "View";
  90
  91 ////////////////////////////////////////////////////////////////////////////////
  92 // View, public:
  93
  94 // Creation and lifetime -------------------------------------------------------
  95
  96 View::View()
  97     : owned_by_client_(false),
  98       id_(0),
  99       group_(-1),
 100       parent_(NULL),
 101       visible_(true),
 102       enabled_(true),
 103       notify_enter_exit_on_child_(false),
 104       registered_for_visible_bounds_notification_(false),
 105       clip_insets_(0, 0, 0, 0),
 106       needs_layout_(true),
 107       snap_layer_to_pixel_boundary_(false),
 108       flip_canvas_on_paint_for_rtl_ui_(false),
 109       paint_to_layer_(false),
 110       accelerator_focus_manager_(NULL),
 111       registered_accelerator_count_(0),
 112       next_focusable_view_(NULL),
 113       previous_focusable_view_(NULL),
 114       focusable_(false),
 115       accessibility_focusable_(false),
 116       context_menu_controller_(NULL),
 117       drag_controller_(NULL),
 118       native_view_accessibility_(NULL) {
 119 }
 120
 121 View::~View() {
 122   if (parent_)
 123     parent_->RemoveChildView(this);
 124
 125   ViewStorage::GetInstance()->ViewRemoved(this);
 126
 127   for (Views::const_iterator i(children_.begin()); i != children_.end(); ++i) {
 128     (*i)->parent_ = NULL;
 129     if (!(*i)->owned_by_client_)
 130       delete *i;
 131   }
 132
 133   // Release ownership of the native accessibility object, but it's
 134   // reference-counted on some platforms, so it may not be deleted right away.
 135   if (native_view_accessibility_)
 136     native_view_accessibility_->Destroy();
 137 }
 138
 139 // Tree operations -------------------------------------------------------------
 140
 141 const Widget* View::GetWidget() const {
 142   // The root view holds a reference to this view hierarchy's Widget.
 143   return parent_ ? parent_->GetWidget() : NULL;
 144 }
 145
 146 Widget* View::GetWidget() {
 147   return const_cast<Widget*>(const_cast<const View*>(this)->GetWidget());
 148 }
 149
 150 void View::AddChildView(View* view) {
 151   if (view->parent_ == this)
 152     return;
 153   AddChildViewAt(view, child_count());
 154 }
 155
 156 void View::AddChildViewAt(View* view, int index) {
 157   CHECK_NE(view, this) << "You cannot add a view as its own child";
 158   DCHECK_GE(index, 0);
 159   DCHECK_LE(index, child_count());
 160
 161   // If |view| has a parent, remove it from its parent.
 162   View* parent = view->parent_;
 163   ui::NativeTheme* old_theme = NULL;
 164   if (parent) {
 165     old_theme = view->GetNativeTheme();
 166     if (parent == this) {
 167       ReorderChildView(view, index);
 168       return;
 169     }
 170     parent->DoRemoveChildView(view, true, true, false, this);
 171   }
 172
 173   // Sets the prev/next focus views.
 174   InitFocusSiblings(view, index);
 175
 176   // Let's insert the view.
 177   view->parent_ = this;
 178   children_.insert(children_.begin() + index, view);
 179
 180   views::Widget* widget = GetWidget();
 181   if (widget) {
 182     const ui::NativeTheme* new_theme = view->GetNativeTheme();
 183     if (new_theme != old_theme)
 184       view->PropagateNativeThemeChanged(new_theme);
 185   }
 186
 187   ViewHierarchyChangedDetails details(true, this, view, parent);
 188
 189   for (View* v = this; v; v = v->parent_)
 190     v->ViewHierarchyChangedImpl(false, details);
 191
 192   view->PropagateAddNotifications(details);
 193   UpdateTooltip();
 194   if (widget) {
 195     RegisterChildrenForVisibleBoundsNotification(view);
 196     if (view->visible())
 197       view->SchedulePaint();
 198   }
 199
 200   if (layout_manager_.get())
 201     layout_manager_->ViewAdded(this, view);
 202
 203   ReorderLayers();
 204
 205   // Make sure the visibility of the child layers are correct.
 206   // If any of the parent View is hidden, then the layers of the subtree
 207   // rooted at |this| should be hidden. Otherwise, all the child layers should
 208   // inherit the visibility of the owner View.
 209   UpdateLayerVisibility();
 210 }
 211
 212 void View::ReorderChildView(View* view, int index) {
 213   DCHECK_EQ(view->parent_, this);
 214   if (index < 0)
 215     index = child_count() - 1;
 216   else if (index >= child_count())
 217     return;
 218   if (children_[index] == view)
 219     return;
 220
 221   const Views::iterator i(std::find(children_.begin(), children_.end(), view));
 222   DCHECK(i != children_.end());
 223   children_.erase(i);
 224
 225   // Unlink the view first
 226   View* next_focusable = view->next_focusable_view_;
 227   View* prev_focusable = view->previous_focusable_view_;
 228   if (prev_focusable)
 229     prev_focusable->next_focusable_view_ = next_focusable;
 230   if (next_focusable)
 231     next_focusable->previous_focusable_view_ = prev_focusable;
 232
 233   // Add it in the specified index now.
 234   InitFocusSiblings(view, index);
 235   children_.insert(children_.begin() + index, view);
 236
 237   ReorderLayers();
 238 }
 239
 240 void View::RemoveChildView(View* view) {
 241   DoRemoveChildView(view, true, true, false, NULL);
 242 }
 243
 244 void View::RemoveAllChildViews(bool delete_children) {
 245   while (!children_.empty())
 246     DoRemoveChildView(children_.front(), false, false, delete_children, NULL);
 247   UpdateTooltip();
 248 }
 249
 250 bool View::Contains(const View* view) const {
 251   for (const View* v = view; v; v = v->parent_) {
 252     if (v == this)
 253       return true;
 254   }
 255   return false;
 256 }
 257
 258 int View::GetIndexOf(const View* view) const {
 259   Views::const_iterator i(std::find(children_.begin(), children_.end(), view));
 260   return i != children_.end() ? static_cast<int>(i - children_.begin()) : -1;
 261 }
 262
 263 // Size and disposition --------------------------------------------------------
 264
 265 void View::SetBounds(int x, int y, int width, int height) {
 266   SetBoundsRect(gfx::Rect(x, y, std::max(0, width), std::max(0, height)));
 267 }
 268
 269 void View::SetBoundsRect(const gfx::Rect& bounds) {
 270   if (bounds == bounds_) {
 271     if (needs_layout_) {
 272       needs_layout_ = false;
 273       Layout();
 274     }
 275     return;
 276   }
 277
 278   if (visible_) {
 279     // Paint where the view is currently.
 280     SchedulePaintBoundsChanged(
 281         bounds_.size() == bounds.size() ? SCHEDULE_PAINT_SIZE_SAME :
 282         SCHEDULE_PAINT_SIZE_CHANGED);
 283   }
 284
 285   gfx::Rect prev = bounds_;
 286   bounds_ = bounds;
 287   BoundsChanged(prev);
 288 }
 289
 290 void View::SetSize(const gfx::Size& size) {
 291   SetBounds(x(), y(), size.width(), size.height());
 292 }
 293
 294 void View::SetPosition(const gfx::Point& position) {
 295   SetBounds(position.x(), position.y(), width(), height());
 296 }
 297
 298 void View::SetX(int x) {
 299   SetBounds(x, y(), width(), height());
 300 }
 301
 302 void View::SetY(int y) {
 303   SetBounds(x(), y, width(), height());
 304 }
 305
 306 gfx::Rect View::GetContentsBounds() const {
 307   gfx::Rect contents_bounds(GetLocalBounds());
 308   if (border_.get())
 309     contents_bounds.Inset(border_->GetInsets());
 310   return contents_bounds;
 311 }
 312
 313 gfx::Rect View::GetLocalBounds() const {
 314   return gfx::Rect(size());
 315 }
 316
 317 gfx::Rect View::GetLayerBoundsInPixel() const {
 318   return layer()->GetTargetBounds();
 319 }
 320
 321 gfx::Insets View::GetInsets() const {
 322   return border_.get() ? border_->GetInsets() : gfx::Insets();
 323 }
 324
 325 gfx::Rect View::GetVisibleBounds() const {
 326   if (!IsDrawn())
 327     return gfx::Rect();
 328   gfx::Rect vis_bounds(GetLocalBounds());
 329   gfx::Rect ancestor_bounds;
 330   const View* view = this;
 331   gfx::Transform transform;
 332
 333   while (view != NULL && !vis_bounds.IsEmpty()) {
 334     transform.ConcatTransform(view->GetTransform());
 335     gfx::Transform translation;
 336     translation.Translate(static_cast<float>(view->GetMirroredX()),
 337                           static_cast<float>(view->y()));
 338     transform.ConcatTransform(translation);
 339
 340     vis_bounds = view->ConvertRectToParent(vis_bounds);
 341     const View* ancestor = view->parent_;
 342     if (ancestor != NULL) {
 343       ancestor_bounds.SetRect(0, 0, ancestor->width(), ancestor->height());
 344       vis_bounds.Intersect(ancestor_bounds);
 345     } else if (!view->GetWidget()) {
 346       // If the view has no Widget, we're not visible. Return an empty rect.
 347       return gfx::Rect();
 348     }
 349     view = ancestor;
 350   }
 351   if (vis_bounds.IsEmpty())
 352     return vis_bounds;
 353   // Convert back to this views coordinate system.
 354   gfx::RectF views_vis_bounds(vis_bounds);
 355   transform.TransformRectReverse(&views_vis_bounds);
 356   // Partially visible pixels should be considered visible.
 357   return gfx::ToEnclosingRect(views_vis_bounds);
 358 }
 359
 360 gfx::Rect View::GetBoundsInScreen() const {
 361   gfx::Point origin;
 362   View::ConvertPointToScreen(this, &origin);
 363   return gfx::Rect(origin, size());
 364 }
 365
 366 gfx::Size View::GetPreferredSize() const {
 367   if (layout_manager_.get())
 368     return layout_manager_->GetPreferredSize(this);
 369   return gfx::Size();
 370 }
 371
 372 int View::GetBaseline() const {
 373   return -1;
 374 }
 375
 376 void View::SizeToPreferredSize() {
 377   gfx::Size prefsize = GetPreferredSize();
 378   if ((prefsize.width() != width()) || (prefsize.height() != height()))
 379     SetBounds(x(), y(), prefsize.width(), prefsize.height());
 380 }
 381
 382 gfx::Size View::GetMinimumSize() const {
 383   return GetPreferredSize();
 384 }
 385
 386 gfx::Size View::GetMaximumSize() const {
 387   return gfx::Size();
 388 }
 389
 390 int View::GetHeightForWidth(int w) const {
 391   if (layout_manager_.get())
 392     return layout_manager_->GetPreferredHeightForWidth(this, w);
 393   return GetPreferredSize().height();
 394 }
 395
 396 void View::SetVisible(bool visible) {
 397   if (visible != visible_) {
 398     // If the View is currently visible, schedule paint to refresh parent.
 399     // TODO(beng): not sure we should be doing this if we have a layer.
 400     if (visible_)
 401       SchedulePaint();
 402
 403     visible_ = visible;
 404     AdvanceFocusIfNecessary();
 405
 406     // Notify the parent.
 407     if (parent_)
 408       parent_->ChildVisibilityChanged(this);
 409
 410     // This notifies all sub-views recursively.
 411     PropagateVisibilityNotifications(this, visible_);
 412     UpdateLayerVisibility();
 413
 414     // If we are newly visible, schedule paint.
 415     if (visible_)
 416       SchedulePaint();
 417   }
 418 }
 419
 420 bool View::IsDrawn() const {
 421   return visible_ && parent_ ? parent_->IsDrawn() : false;
 422 }
 423
 424 void View::SetEnabled(bool enabled) {
 425   if (enabled != enabled_) {
 426     enabled_ = enabled;
 427     AdvanceFocusIfNecessary();
 428     OnEnabledChanged();
 429   }
 430 }
 431
 432 void View::OnEnabledChanged() {
 433   SchedulePaint();
 434 }
 435
 436 // Transformations -------------------------------------------------------------
 437
 438 gfx::Transform View::GetTransform() const {
 439   return layer() ? layer()->transform() : gfx::Transform();
 440 }
 441
 442 void View::SetTransform(const gfx::Transform& transform) {
 443   if (transform.IsIdentity()) {
 444     if (layer()) {
 445       layer()->SetTransform(transform);
 446       if (!paint_to_layer_)
 447         DestroyLayer();
 448     } else {
 449       // Nothing.
 450     }
 451   } else {
 452     if (!layer())
 453       CreateLayer();
 454     layer()->SetTransform(transform);
 455     layer()->ScheduleDraw();
 456   }
 457 }
 458
 459 void View::SetPaintToLayer(bool paint_to_layer) {
 460   if (paint_to_layer_ == paint_to_layer)
 461     return;
 462
 463   paint_to_layer_ = paint_to_layer;
 464   if (paint_to_layer_ && !layer()) {
 465     CreateLayer();
 466   } else if (!paint_to_layer_ && layer()) {
 467     DestroyLayer();
 468   }
 469 }
 470
 471 // RTL positioning -------------------------------------------------------------
 472
 473 gfx::Rect View::GetMirroredBounds() const {
 474   gfx::Rect bounds(bounds_);
 475   bounds.set_x(GetMirroredX());
 476   return bounds;
 477 }
 478
 479 gfx::Point View::GetMirroredPosition() const {
 480   return gfx::Point(GetMirroredX(), y());
 481 }
 482
 483 int View::GetMirroredX() const {
 484   return parent_ ? parent_->GetMirroredXForRect(bounds_) : x();
 485 }
 486
 487 int View::GetMirroredXForRect(const gfx::Rect& bounds) const {
 488   return base::i18n::IsRTL() ?
 489       (width() - bounds.x() - bounds.width()) : bounds.x();
 490 }
 491
 492 int View::GetMirroredXInView(int x) const {
 493   return base::i18n::IsRTL() ? width() - x : x;
 494 }
 495
 496 int View::GetMirroredXWithWidthInView(int x, int w) const {
 497   return base::i18n::IsRTL() ? width() - x - w : x;
 498 }
 499
 500 // Layout ----------------------------------------------------------------------
 501
 502 void View::Layout() {
 503   needs_layout_ = false;
 504
 505   // If we have a layout manager, let it handle the layout for us.
 506   if (layout_manager_.get())
 507     layout_manager_->Layout(this);
 508
 509   // Make sure to propagate the Layout() call to any children that haven't
 510   // received it yet through the layout manager and need to be laid out. This
 511   // is needed for the case when the child requires a layout but its bounds
 512   // weren't changed by the layout manager. If there is no layout manager, we
 513   // just propagate the Layout() call down the hierarchy, so whoever receives
 514   // the call can take appropriate action.
 515   for (int i = 0, count = child_count(); i < count; ++i) {
 516     View* child = child_at(i);
 517     if (child->needs_layout_ || !layout_manager_.get()) {
 518       TRACE_EVENT1("views", "View::Layout", "class", child->GetClassName());
 519       child->needs_layout_ = false;
 520       child->Layout();
 521     }
 522   }
 523 }
 524
 525 void View::InvalidateLayout() {
 526   // Always invalidate up. This is needed to handle the case of us already being
 527   // valid, but not our parent.
 528   needs_layout_ = true;
 529   if (parent_)
 530     parent_->InvalidateLayout();
 531 }
 532
 533 LayoutManager* View::GetLayoutManager() const {
 534   return layout_manager_.get();
 535 }
 536
 537 void View::SetLayoutManager(LayoutManager* layout_manager) {
 538   if (layout_manager_.get())
 539     layout_manager_->Uninstalled(this);
 540
 541   layout_manager_.reset(layout_manager);
 542   if (layout_manager_.get())
 543     layout_manager_->Installed(this);
 544 }
 545
 546 void View::SnapLayerToPixelBoundary() {
 547   if (!layer())
 548     return;
 549
 550   if (snap_layer_to_pixel_boundary_ && layer()->parent() &&
 551       layer()->GetCompositor()) {
 552     ui::SnapLayerToPhysicalPixelBoundary(layer()->parent(), layer());
 553   } else {
 554     // Reset the offset.
 555     layer()->SetSubpixelPositionOffset(gfx::Vector2dF());
 556   }
 557 }
 558
 559 // Attributes ------------------------------------------------------------------
 560
 561 const char* View::GetClassName() const {
 562   return kViewClassName;
 563 }
 564
 565 const View* View::GetAncestorWithClassName(const std::string& name) const {
 566   for (const View* view = this; view; view = view->parent_) {
 567     if (!strcmp(view->GetClassName(), name.c_str()))
 568       return view;
 569   }
 570   return NULL;
 571 }
 572
 573 View* View::GetAncestorWithClassName(const std::string& name) {
 574   return const_cast<View*>(const_cast<const View*>(this)->
 575       GetAncestorWithClassName(name));
 576 }
 577
 578 const View* View::GetViewByID(int id) const {
 579   if (id == id_)
 580     return const_cast<View*>(this);
 581
 582   for (int i = 0, count = child_count(); i < count; ++i) {
 583     const View* view = child_at(i)->GetViewByID(id);
 584     if (view)
 585       return view;
 586   }
 587   return NULL;
 588 }
 589
 590 View* View::GetViewByID(int id) {
 591   return const_cast<View*>(const_cast<const View*>(this)->GetViewByID(id));
 592 }
 593
 594 void View::SetGroup(int gid) {
 595   // Don't change the group id once it's set.
 596   DCHECK(group_ == -1 || group_ == gid);
 597   group_ = gid;
 598 }
 599
 600 int View::GetGroup() const {
 601   return group_;
 602 }
 603
 604 bool View::IsGroupFocusTraversable() const {
 605   return true;
 606 }
 607
 608 void View::GetViewsInGroup(int group, Views* views) {
 609   if (group_ == group)
 610     views->push_back(this);
 611
 612   for (int i = 0, count = child_count(); i < count; ++i)
 613     child_at(i)->GetViewsInGroup(group, views);
 614 }
 615
 616 View* View::GetSelectedViewForGroup(int group) {
 617   Views views;
 618   GetWidget()->GetRootView()->GetViewsInGroup(group, &views);
 619   return views.empty() ? NULL : views[0];
 620 }
 621
 622 // Coordinate conversion -------------------------------------------------------
 623
 624 // static
 625 void View::ConvertPointToTarget(const View* source,
 626                                 const View* target,
 627                                 gfx::Point* point) {
 628   DCHECK(source);
 629   DCHECK(target);
 630   if (source == target)
 631     return;
 632
 633   const View* root = GetHierarchyRoot(target);
 634   CHECK_EQ(GetHierarchyRoot(source), root);
 635
 636   if (source != root)
 637     source->ConvertPointForAncestor(root, point);
 638
 639   if (target != root)
 640     target->ConvertPointFromAncestor(root, point);
 641 }
 642
 643 // static
 644 void View::ConvertRectToTarget(const View* source,
 645                                const View* target,
 646                                gfx::RectF* rect) {
 647   DCHECK(source);
 648   DCHECK(target);
 649   if (source == target)
 650     return;
 651
 652   const View* root = GetHierarchyRoot(target);
 653   CHECK_EQ(GetHierarchyRoot(source), root);
 654
 655   if (source != root)
 656     source->ConvertRectForAncestor(root, rect);
 657
 658   if (target != root)
 659     target->ConvertRectFromAncestor(root, rect);
 660 }
 661
 662 // static
 663 void View::ConvertPointToWidget(const View* src, gfx::Point* p) {
 664   DCHECK(src);
 665   DCHECK(p);
 666
 667   src->ConvertPointForAncestor(NULL, p);
 668 }
 669
 670 // static
 671 void View::ConvertPointFromWidget(const View* dest, gfx::Point* p) {
 672   DCHECK(dest);
 673   DCHECK(p);
 674
 675   dest->ConvertPointFromAncestor(NULL, p);
 676 }
 677
 678 // static
 679 void View::ConvertPointToScreen(const View* src, gfx::Point* p) {
 680   DCHECK(src);
 681   DCHECK(p);
 682
 683   // If the view is not connected to a tree, there's nothing we can do.
 684   const Widget* widget = src->GetWidget();
 685   if (widget) {
 686     ConvertPointToWidget(src, p);
 687     *p += widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
 688   }
 689 }
 690
 691 // static
 692 void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) {
 693   DCHECK(dst);
 694   DCHECK(p);
 695
 696   const views::Widget* widget = dst->GetWidget();
 697   if (!widget)
 698     return;
 699   *p -= widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
 700   views::View::ConvertPointFromWidget(dst, p);
 701 }
 702
 703 gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const {
 704   gfx::RectF x_rect = rect;
 705   GetTransform().TransformRect(&x_rect);
 706   x_rect.Offset(GetMirroredPosition().OffsetFromOrigin());
 707   // Pixels we partially occupy in the parent should be included.
 708   return gfx::ToEnclosingRect(x_rect);
 709 }
 710
 711 gfx::Rect View::ConvertRectToWidget(const gfx::Rect& rect) const {
 712   gfx::Rect x_rect = rect;
 713   for (const View* v = this; v; v = v->parent_)
 714     x_rect = v->ConvertRectToParent(x_rect);
 715   return x_rect;
 716 }
 717
 718 // Painting --------------------------------------------------------------------
 719
 720 void View::SchedulePaint() {
 721   SchedulePaintInRect(GetLocalBounds());
 722 }
 723
 724 void View::SchedulePaintInRect(const gfx::Rect& rect) {
 725   if (!visible_)
 726     return;
 727
 728   if (layer()) {
 729     layer()->SchedulePaint(rect);
 730   } else if (parent_) {
 731     // Translate the requested paint rect to the parent's coordinate system
 732     // then pass this notification up to the parent.
 733     parent_->SchedulePaintInRect(ConvertRectToParent(rect));
 734   }
 735 }
 736
 737 void View::Paint(const ui::PaintContext& parent_context) {
 738   if (!visible_)
 739     return;
 740
 741   gfx::Vector2d offset_to_parent;
 742   if (!layer()) {
 743     // If the View has a layer() then it is a paint root. Otherwise, we need to
 744     // add the offset from the parent into the total offset from the paint root.
 745     DCHECK_IMPLIES(!parent(), bounds().origin() == gfx::Point());
 746     offset_to_parent = GetMirroredPosition().OffsetFromOrigin();
 747   }
 748   ui::PaintContext context =
 749       parent_context.CloneWithPaintOffset(offset_to_parent);
 750
 751   bool is_invalidated = true;
 752   if (context.CanCheckInvalid()) {
 753 #if DCHECK_IS_ON()
 754     gfx::Vector2d offset;
 755     context.Visited(this);
 756     View* view = this;
 757     while (view->parent() && !view->layer()) {
 758       DCHECK(view->GetTransform().IsIdentity());
 759       offset += view->GetMirroredPosition().OffsetFromOrigin();
 760       view = view->parent();
 761     }
 762     // The offset in the PaintContext should be the offset up to the paint root,
 763     // which we compute and verify here.
 764     DCHECK_EQ(context.PaintOffset().x(), offset.x());
 765     DCHECK_EQ(context.PaintOffset().y(), offset.y());
 766     // The above loop will stop when |view| is the paint root, which should be
 767     // the root of the current paint walk, as verified by storing the root in
 768     // the PaintContext.
 769     DCHECK_EQ(context.RootVisited(), view);
 770 #endif
 771
 772     // If the View wasn't invalidated, don't waste time painting it, the output
 773     // would be culled.
 774     is_invalidated = context.IsRectInvalid(GetLocalBounds());
 775   }
 776
 777   if (!is_invalidated && context.ShouldEarlyOutOfPaintingWhenValid())
 778     return;
 779
 780   TRACE_EVENT1("views", "View::Paint", "class", GetClassName());
 781
 782   // If the view is backed by a layer, it should paint with itself as the origin
 783   // rather than relative to its parent.
 784   scoped_ptr<ui::ClipTransformRecorder> clip_transform_recorder;
 785   if (!layer()) {
 786     clip_transform_recorder.reset(new ui::ClipTransformRecorder(context));
 787
 788     // Set the clip rect to the bounds of this View. Note that the X (or left)
 789     // position we pass to ClipRect takes into consideration whether or not the
 790     // View uses a right-to-left layout so that we paint the View in its
 791     // mirrored position if need be.
 792     gfx::Rect clip_rect_in_parent = bounds();
 793     clip_rect_in_parent.Inset(clip_insets_);
 794     if (parent_)
 795       clip_rect_in_parent.set_x(
 796           parent_->GetMirroredXForRect(clip_rect_in_parent));
 797     clip_transform_recorder->ClipRect(clip_rect_in_parent);
 798
 799     // Translate the graphics such that 0,0 corresponds to where
 800     // this View is located relative to its parent.
 801     gfx::Transform transform_from_parent;
 802     gfx::Vector2d offset_from_parent = GetMirroredPosition().OffsetFromOrigin();
 803     transform_from_parent.Translate(offset_from_parent.x(),
 804                                     offset_from_parent.y());
 805     transform_from_parent.PreconcatTransform(GetTransform());
 806     clip_transform_recorder->Transform(transform_from_parent);
 807   }
 808
 809   if (is_invalidated || !paint_cache_.UseCache(context)) {
 810     ui::PaintRecorder recorder(context, &paint_cache_);
 811     gfx::Canvas* canvas = recorder.canvas();
 812     gfx::ScopedCanvas scoped_canvas(canvas);
 813
 814     // If the View we are about to paint requested the canvas to be flipped, we
 815     // should change the transform appropriately.
 816     // The canvas mirroring is undone once the View is done painting so that we
 817     // don't pass the canvas with the mirrored transform to Views that didn't
 818     // request the canvas to be flipped.
 819     if (FlipCanvasOnPaintForRTLUI()) {
 820       canvas->Translate(gfx::Vector2d(width(), 0));
 821       canvas->Scale(-1, 1);
 822     }
 823
 824     // Delegate painting the contents of the View to the virtual OnPaint method.
 825     OnPaint(canvas);
 826   }
 827
 828   // View::Paint() recursion over the subtree.
 829   PaintChildren(context);
 830 }
 831
 832 void View::set_background(Background* b) {
 833   background_.reset(b);
 834 }
 835
 836 void View::SetBorder(scoped_ptr<Border> b) { border_ = b.Pass(); }
 837
 838 ui::ThemeProvider* View::GetThemeProvider() const {
 839   const Widget* widget = GetWidget();
 840   return widget ? widget->GetThemeProvider() : NULL;
 841 }
 842
 843 const ui::NativeTheme* View::GetNativeTheme() const {
 844   const Widget* widget = GetWidget();
 845   return widget ? widget->GetNativeTheme() : ui::NativeTheme::instance();
 846 }
 847
 848 // Input -----------------------------------------------------------------------
 849
 850 View* View::GetEventHandlerForPoint(const gfx::Point& point) {
 851   return GetEventHandlerForRect(gfx::Rect(point, gfx::Size(1, 1)));
 852 }
 853
 854 View* View::GetEventHandlerForRect(const gfx::Rect& rect) {
 855   return GetEffectiveViewTargeter()->TargetForRect(this, rect);
 856 }
 857
 858 bool View::CanProcessEventsWithinSubtree() const {
 859   return true;
 860 }
 861
 862 View* View::GetTooltipHandlerForPoint(const gfx::Point& point) {
 863   // TODO(tdanderson): Move this implementation into ViewTargetDelegate.
 864   if (!HitTestPoint(point) || !CanProcessEventsWithinSubtree())
 865     return NULL;
 866
 867   // Walk the child Views recursively looking for the View that most
 868   // tightly encloses the specified point.
 869   for (int i = child_count() - 1; i >= 0; --i) {
 870     View* child = child_at(i);
 871     if (!child->visible())
 872       continue;
 873
 874     gfx::Point point_in_child_coords(point);
 875     ConvertPointToTarget(this, child, &point_in_child_coords);
 876     View* handler = child->GetTooltipHandlerForPoint(point_in_child_coords);
 877     if (handler)
 878       return handler;
 879   }
 880   return this;
 881 }
 882
 883 gfx::NativeCursor View::GetCursor(const ui::MouseEvent& event) {
 884 #if defined(OS_WIN)
 885   static ui::Cursor arrow;
 886   if (!arrow.platform())
 887     arrow.SetPlatformCursor(LoadCursor(NULL, IDC_ARROW));
 888   return arrow;
 889 #else
 890   return gfx::kNullCursor;
 891 #endif
 892 }
 893
 894 bool View::HitTestPoint(const gfx::Point& point) const {
 895   return HitTestRect(gfx::Rect(point, gfx::Size(1, 1)));
 896 }
 897
 898 bool View::HitTestRect(const gfx::Rect& rect) const {
 899   return GetEffectiveViewTargeter()->DoesIntersectRect(this, rect);
 900 }
 901
 902 bool View::IsMouseHovered() {
 903   // If we haven't yet been placed in an onscreen view hierarchy, we can't be
 904   // hovered.
 905   if (!GetWidget())
 906     return false;
 907
 908   // If mouse events are disabled, then the mouse cursor is invisible and
 909   // is therefore not hovering over this button.
 910   if (!GetWidget()->IsMouseEventsEnabled())
 911     return false;
 912
 913   gfx::Point cursor_pos(gfx::Screen::GetScreenFor(
 914       GetWidget()->GetNativeView())->GetCursorScreenPoint());
 915   ConvertPointFromScreen(this, &cursor_pos);
 916   return HitTestPoint(cursor_pos);
 917 }
 918
 919 bool View::OnMousePressed(const ui::MouseEvent& event) {
 920   return false;
 921 }
 922
 923 bool View::OnMouseDragged(const ui::MouseEvent& event) {
 924   return false;
 925 }
 926
 927 void View::OnMouseReleased(const ui::MouseEvent& event) {
 928 }
 929
 930 void View::OnMouseCaptureLost() {
 931 }
 932
 933 void View::OnMouseMoved(const ui::MouseEvent& event) {
 934 }
 935
 936 void View::OnMouseEntered(const ui::MouseEvent& event) {
 937 }
 938
 939 void View::OnMouseExited(const ui::MouseEvent& event) {
 940 }
 941
 942 void View::SetMouseHandler(View* new_mouse_handler) {
 943   // |new_mouse_handler| may be NULL.
 944   if (parent_)
 945     parent_->SetMouseHandler(new_mouse_handler);
 946 }
 947
 948 bool View::OnKeyPressed(const ui::KeyEvent& event) {
 949   return false;
 950 }
 951
 952 bool View::OnKeyReleased(const ui::KeyEvent& event) {
 953   return false;
 954 }
 955
 956 bool View::OnMouseWheel(const ui::MouseWheelEvent& event) {
 957   return false;
 958 }
 959
 960 void View::OnKeyEvent(ui::KeyEvent* event) {
 961   bool consumed = (event->type() == ui::ET_KEY_PRESSED) ? OnKeyPressed(*event) :
 962                                                           OnKeyReleased(*event);
 963   if (consumed)
 964     event->StopPropagation();
 965 }
 966
 967 void View::OnMouseEvent(ui::MouseEvent* event) {
 968   switch (event->type()) {
 969     case ui::ET_MOUSE_PRESSED:
 970       if (ProcessMousePressed(*event))
 971         event->SetHandled();
 972       return;
 973
 974     case ui::ET_MOUSE_MOVED:
 975       if ((event->flags() & (ui::EF_LEFT_MOUSE_BUTTON |
 976                              ui::EF_RIGHT_MOUSE_BUTTON |
 977                              ui::EF_MIDDLE_MOUSE_BUTTON)) == 0) {
 978         OnMouseMoved(*event);
 979         return;
 980       }
 981       // FALL-THROUGH
 982     case ui::ET_MOUSE_DRAGGED:
 983       if (ProcessMouseDragged(*event))
 984         event->SetHandled();
 985       return;
 986
 987     case ui::ET_MOUSE_RELEASED:
 988       ProcessMouseReleased(*event);
 989       return;
 990
 991     case ui::ET_MOUSEWHEEL:
 992       if (OnMouseWheel(*static_cast<ui::MouseWheelEvent*>(event)))
 993         event->SetHandled();
 994       break;
 995
 996     case ui::ET_MOUSE_ENTERED:
 997       if (event->flags() & ui::EF_TOUCH_ACCESSIBILITY)
 998         NotifyAccessibilityEvent(ui::AX_EVENT_HOVER, true);
 999       OnMouseEntered(*event);
1000       break;
1001
1002     case ui::ET_MOUSE_EXITED:
1003       OnMouseExited(*event);
1004       break;
1005
1006     default:
1007       return;
1008   }
1009 }
1010
1011 void View::OnScrollEvent(ui::ScrollEvent* event) {
1012 }
1013
1014 void View::OnTouchEvent(ui::TouchEvent* event) {
1015   NOTREACHED() << "Views should not receive touch events.";
1016 }
1017
1018 void View::OnGestureEvent(ui::GestureEvent* event) {
1019 }
1020
1021 ui::TextInputClient* View::GetTextInputClient() {
1022   return NULL;
1023 }
1024
1025 InputMethod* View::GetInputMethod() {
1026   Widget* widget = GetWidget();
1027   return widget ? widget->GetInputMethod() : NULL;
1028 }
1029
1030 const InputMethod* View::GetInputMethod() const {
1031   const Widget* widget = GetWidget();
1032   return widget ? widget->GetInputMethod() : NULL;
1033 }
1034
1035 scoped_ptr<ViewTargeter>
1036 View::SetEventTargeter(scoped_ptr<ViewTargeter> targeter) {
1037   scoped_ptr<ViewTargeter> old_targeter = targeter_.Pass();
1038   targeter_ = targeter.Pass();
1039   return old_targeter.Pass();
1040 }
1041
1042 ViewTargeter* View::GetEffectiveViewTargeter() const {
1043   DCHECK(GetWidget());
1044   ViewTargeter* view_targeter = targeter();
1045   if (!view_targeter)
1046     view_targeter = GetWidget()->GetRootView()->targeter();
1047   CHECK(view_targeter);
1048   return view_targeter;
1049 }
1050
1051 bool View::CanAcceptEvent(const ui::Event& event) {
1052   return IsDrawn();
1053 }
1054
1055 ui::EventTarget* View::GetParentTarget() {
1056   return parent_;
1057 }
1058
1059 scoped_ptr<ui::EventTargetIterator> View::GetChildIterator() const {
1060   return make_scoped_ptr(new ui::EventTargetIteratorImpl<View>(children_));
1061 }
1062
1063 ui::EventTargeter* View::GetEventTargeter() {
1064   return targeter_.get();
1065 }
1066
1067 void View::ConvertEventToTarget(ui::EventTarget* target,
1068                                 ui::LocatedEvent* event) {
1069   event->ConvertLocationToTarget(this, static_cast<View*>(target));
1070 }
1071
1072 // Accelerators ----------------------------------------------------------------
1073
1074 void View::AddAccelerator(const ui::Accelerator& accelerator) {
1075   if (!accelerators_.get())
1076     accelerators_.reset(new std::vector<ui::Accelerator>());
1077
1078   if (std::find(accelerators_->begin(), accelerators_->end(), accelerator) ==
1079       accelerators_->end()) {
1080     accelerators_->push_back(accelerator);
1081   }
1082   RegisterPendingAccelerators();
1083 }
1084
1085 void View::RemoveAccelerator(const ui::Accelerator& accelerator) {
1086   if (!accelerators_.get()) {
1087     NOTREACHED() << "Removing non-existing accelerator";
1088     return;
1089   }
1090
1091   std::vector<ui::Accelerator>::iterator i(
1092       std::find(accelerators_->begin(), accelerators_->end(), accelerator));
1093   if (i == accelerators_->end()) {
1094     NOTREACHED() << "Removing non-existing accelerator";
1095     return;
1096   }
1097
1098   size_t index = i - accelerators_->begin();
1099   accelerators_->erase(i);
1100   if (index >= registered_accelerator_count_) {
1101     // The accelerator is not registered to FocusManager.
1102     return;
1103   }
1104   --registered_accelerator_count_;
1105
1106   // Providing we are attached to a Widget and registered with a focus manager,
1107   // we should de-register from that focus manager now.
1108   if (GetWidget() && accelerator_focus_manager_)
1109     accelerator_focus_manager_->UnregisterAccelerator(accelerator, this);
1110 }
1111
1112 void View::ResetAccelerators() {
1113   if (accelerators_.get())
1114     UnregisterAccelerators(false);
1115 }
1116
1117 bool View::AcceleratorPressed(const ui::Accelerator& accelerator) {
1118   return false;
1119 }
1120
1121 bool View::CanHandleAccelerators() const {
1122   return enabled() && IsDrawn() && GetWidget() && GetWidget()->IsVisible();
1123 }
1124
1125 // Focus -----------------------------------------------------------------------
1126
1127 bool View::HasFocus() const {
1128   const FocusManager* focus_manager = GetFocusManager();
1129   return focus_manager && (focus_manager->GetFocusedView() == this);
1130 }
1131
1132 View* View::GetNextFocusableView() {
1133   return next_focusable_view_;
1134 }
1135
1136 const View* View::GetNextFocusableView() const {
1137   return next_focusable_view_;
1138 }
1139
1140 View* View::GetPreviousFocusableView() {
1141   return previous_focusable_view_;
1142 }
1143
1144 void View::SetNextFocusableView(View* view) {
1145   if (view)
1146     view->previous_focusable_view_ = this;
1147   next_focusable_view_ = view;
1148 }
1149
1150 void View::SetFocusable(bool focusable) {
1151   if (focusable_ == focusable)
1152     return;
1153
1154   focusable_ = focusable;
1155   AdvanceFocusIfNecessary();
1156 }
1157
1158 bool View::IsFocusable() const {
1159   return focusable_ && enabled_ && IsDrawn();
1160 }
1161
1162 bool View::IsAccessibilityFocusable() const {
1163   return (focusable_ || accessibility_focusable_) && enabled_ && IsDrawn();
1164 }
1165
1166 void View::SetAccessibilityFocusable(bool accessibility_focusable) {
1167   if (accessibility_focusable_ == accessibility_focusable)
1168     return;
1169
1170   accessibility_focusable_ = accessibility_focusable;
1171   AdvanceFocusIfNecessary();
1172 }
1173
1174 FocusManager* View::GetFocusManager() {
1175   Widget* widget = GetWidget();
1176   return widget ? widget->GetFocusManager() : NULL;
1177 }
1178
1179 const FocusManager* View::GetFocusManager() const {
1180   const Widget* widget = GetWidget();
1181   return widget ? widget->GetFocusManager() : NULL;
1182 }
1183
1184 void View::RequestFocus() {
1185   FocusManager* focus_manager = GetFocusManager();
1186   if (focus_manager && IsFocusable())
1187     focus_manager->SetFocusedView(this);
1188 }
1189
1190 bool View::SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) {
1191   return false;
1192 }
1193
1194 FocusTraversable* View::GetFocusTraversable() {
1195   return NULL;
1196 }
1197
1198 FocusTraversable* View::GetPaneFocusTraversable() {
1199   return NULL;
1200 }
1201
1202 // Tooltips --------------------------------------------------------------------
1203
1204 bool View::GetTooltipText(const gfx::Point& p, base::string16* tooltip) const {
1205   return false;
1206 }
1207
1208 bool View::GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) const {
1209   return false;
1210 }
1211
1212 // Context menus ---------------------------------------------------------------
1213
1214 void View::ShowContextMenu(const gfx::Point& p,
1215                            ui::MenuSourceType source_type) {
1216   if (!context_menu_controller_)
1217     return;
1218
1219   context_menu_controller_->ShowContextMenuForView(this, p, source_type);
1220 }
1221
1222 // static
1223 bool View::ShouldShowContextMenuOnMousePress() {
1224   return kContextMenuOnMousePress;
1225 }
1226
1227 // Drag and drop ---------------------------------------------------------------
1228
1229 bool View::GetDropFormats(
1230       int* formats,
1231       std::set<OSExchangeData::CustomFormat>* custom_formats) {
1232   return false;
1233 }
1234
1235 bool View::AreDropTypesRequired() {
1236   return false;
1237 }
1238
1239 bool View::CanDrop(const OSExchangeData& data) {
1240   // TODO(sky): when I finish up migration, this should default to true.
1241   return false;
1242 }
1243
1244 void View::OnDragEntered(const ui::DropTargetEvent& event) {
1245 }
1246
1247 int View::OnDragUpdated(const ui::DropTargetEvent& event) {
1248   return ui::DragDropTypes::DRAG_NONE;
1249 }
1250
1251 void View::OnDragExited() {
1252 }
1253
1254 int View::OnPerformDrop(const ui::DropTargetEvent& event) {
1255   return ui::DragDropTypes::DRAG_NONE;
1256 }
1257
1258 void View::OnDragDone() {
1259 }
1260
1261 // static
1262 bool View::ExceededDragThreshold(const gfx::Vector2d& delta) {
1263   return (abs(delta.x()) > GetHorizontalDragThreshold() ||
1264           abs(delta.y()) > GetVerticalDragThreshold());
1265 }
1266
1267 // Accessibility----------------------------------------------------------------
1268
1269 gfx::NativeViewAccessible View::GetNativeViewAccessible() {
1270   if (!native_view_accessibility_)
1271     native_view_accessibility_ = NativeViewAccessibility::Create(this);
1272   if (native_view_accessibility_)
1273     return native_view_accessibility_->GetNativeObject();
1274   return NULL;
1275 }
1276
1277 void View::NotifyAccessibilityEvent(
1278     ui::AXEvent event_type,
1279     bool send_native_event) {
1280   if (ViewsDelegate::views_delegate)
1281     ViewsDelegate::views_delegate->NotifyAccessibilityEvent(this, event_type);
1282
1283   if (send_native_event && GetWidget()) {
1284     if (!native_view_accessibility_)
1285       native_view_accessibility_ = NativeViewAccessibility::Create(this);
1286     if (native_view_accessibility_)
1287       native_view_accessibility_->NotifyAccessibilityEvent(event_type);
1288   }
1289 }
1290
1291 // Scrolling -------------------------------------------------------------------
1292
1293 void View::ScrollRectToVisible(const gfx::Rect& rect) {
1294   // We must take RTL UI mirroring into account when adjusting the position of
1295   // the region.
1296   if (parent_) {
1297     gfx::Rect scroll_rect(rect);
1298     scroll_rect.Offset(GetMirroredX(), y());
1299     parent_->ScrollRectToVisible(scroll_rect);
1300   }
1301 }
1302
1303 int View::GetPageScrollIncrement(ScrollView* scroll_view,
1304                                  bool is_horizontal, bool is_positive) {
1305   return 0;
1306 }
1307
1308 int View::GetLineScrollIncrement(ScrollView* scroll_view,
1309                                  bool is_horizontal, bool is_positive) {
1310   return 0;
1311 }
1312
1313 ////////////////////////////////////////////////////////////////////////////////
1314 // View, protected:
1315
1316 // Size and disposition --------------------------------------------------------
1317
1318 void View::OnBoundsChanged(const gfx::Rect& previous_bounds) {
1319 }
1320
1321 void View::PreferredSizeChanged() {
1322   InvalidateLayout();
1323   if (parent_)
1324     parent_->ChildPreferredSizeChanged(this);
1325 }
1326
1327 bool View::GetNeedsNotificationWhenVisibleBoundsChange() const {
1328   return false;
1329 }
1330
1331 void View::OnVisibleBoundsChanged() {
1332 }
1333
1334 // Tree operations -------------------------------------------------------------
1335
1336 void View::ViewHierarchyChanged(const ViewHierarchyChangedDetails& details) {
1337 }
1338
1339 void View::VisibilityChanged(View* starting_from, bool is_visible) {
1340 }
1341
1342 void View::NativeViewHierarchyChanged() {
1343   FocusManager* focus_manager = GetFocusManager();
1344   if (accelerator_focus_manager_ != focus_manager) {
1345     UnregisterAccelerators(true);
1346
1347     if (focus_manager)
1348       RegisterPendingAccelerators();
1349   }
1350 }
1351
1352 // Painting --------------------------------------------------------------------
1353
1354 void View::PaintChildren(const ui::PaintContext& context) {
1355   TRACE_EVENT1("views", "View::PaintChildren", "class", GetClassName());
1356   for (int i = 0, count = child_count(); i < count; ++i)
1357     if (!child_at(i)->layer())
1358       child_at(i)->Paint(context);
1359 }
1360
1361 void View::OnPaint(gfx::Canvas* canvas) {
1362   TRACE_EVENT1("views", "View::OnPaint", "class", GetClassName());
1363   OnPaintBackground(canvas);
1364   OnPaintBorder(canvas);
1365 }
1366
1367 void View::OnPaintBackground(gfx::Canvas* canvas) {
1368   if (background_.get()) {
1369     TRACE_EVENT2("views", "View::OnPaintBackground",
1370                  "width", canvas->sk_canvas()->getDevice()->width(),
1371                  "height", canvas->sk_canvas()->getDevice()->height());
1372     background_->Paint(canvas, this);
1373   }
1374 }
1375
1376 void View::OnPaintBorder(gfx::Canvas* canvas) {
1377   if (border_.get()) {
1378     TRACE_EVENT2("views", "View::OnPaintBorder",
1379                  "width", canvas->sk_canvas()->getDevice()->width(),
1380                  "height", canvas->sk_canvas()->getDevice()->height());
1381     border_->Paint(*this, canvas);
1382   }
1383 }
1384
1385 // Accelerated Painting --------------------------------------------------------
1386
1387 void View::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
1388   // This method should not have the side-effect of creating the layer.
1389   if (layer())
1390     layer()->SetFillsBoundsOpaquely(fills_bounds_opaquely);
1391 }
1392
1393 gfx::Vector2d View::CalculateOffsetToAncestorWithLayer(
1394     ui::Layer** layer_parent) {
1395   if (layer()) {
1396     if (layer_parent)
1397       *layer_parent = layer();
1398     return gfx::Vector2d();
1399   }
1400   if (!parent_)
1401     return gfx::Vector2d();
1402
1403   return gfx::Vector2d(GetMirroredX(), y()) +
1404       parent_->CalculateOffsetToAncestorWithLayer(layer_parent);
1405 }
1406
1407 void View::UpdateParentLayer() {
1408   if (!layer())
1409     return;
1410
1411   ui::Layer* parent_layer = NULL;
1412   gfx::Vector2d offset(GetMirroredX(), y());
1413
1414   if (parent_)
1415     offset += parent_->CalculateOffsetToAncestorWithLayer(&parent_layer);
1416
1417   ReparentLayer(offset, parent_layer);
1418 }
1419
1420 void View::MoveLayerToParent(ui::Layer* parent_layer,
1421                              const gfx::Point& point) {
1422   gfx::Point local_point(point);
1423   if (parent_layer != layer())
1424     local_point.Offset(GetMirroredX(), y());
1425   if (layer() && parent_layer != layer()) {
1426     parent_layer->Add(layer());
1427     SetLayerBounds(gfx::Rect(local_point.x(), local_point.y(),
1428                              width(), height()));
1429   } else {
1430     for (int i = 0, count = child_count(); i < count; ++i)
1431       child_at(i)->MoveLayerToParent(parent_layer, local_point);
1432   }
1433 }
1434
1435 void View::UpdateLayerVisibility() {
1436   bool visible = visible_;
1437   for (const View* v = parent_; visible && v && !v->layer(); v = v->parent_)
1438     visible = v->visible();
1439
1440   UpdateChildLayerVisibility(visible);
1441 }
1442
1443 void View::UpdateChildLayerVisibility(bool ancestor_visible) {
1444   if (layer()) {
1445     layer()->SetVisible(ancestor_visible && visible_);
1446   } else {
1447     for (int i = 0, count = child_count(); i < count; ++i)
1448       child_at(i)->UpdateChildLayerVisibility(ancestor_visible && visible_);
1449   }
1450 }
1451
1452 void View::UpdateChildLayerBounds(const gfx::Vector2d& offset) {
1453   if (layer()) {
1454     SetLayerBounds(GetLocalBounds() + offset);
1455   } else {
1456     for (int i = 0, count = child_count(); i < count; ++i) {
1457       View* child = child_at(i);
1458       child->UpdateChildLayerBounds(
1459           offset + gfx::Vector2d(child->GetMirroredX(), child->y()));
1460     }
1461   }
1462 }
1463
1464 void View::OnPaintLayer(const ui::PaintContext& context) {
1465   if (!layer()->fills_bounds_opaquely()) {
1466     ui::PaintRecorder recorder(context);
1467     recorder.canvas()->DrawColor(SK_ColorBLACK, SkXfermode::kClear_Mode);
1468   }
1469   if (!visible_)
1470     return;
1471   Paint(context);
1472 }
1473
1474 void View::OnDelegatedFrameDamage(
1475     const gfx::Rect& damage_rect_in_dip) {
1476 }
1477
1478 void View::OnDeviceScaleFactorChanged(float device_scale_factor) {
1479   snap_layer_to_pixel_boundary_ =
1480       (device_scale_factor - std::floor(device_scale_factor)) != 0.0f;
1481   SnapLayerToPixelBoundary();
1482   // Repainting with new scale factor will paint the content at the right scale.
1483 }
1484
1485 base::Closure View::PrepareForLayerBoundsChange() {
1486   return base::Closure();
1487 }
1488
1489 void View::ReorderLayers() {
1490   View* v = this;
1491   while (v && !v->layer())
1492     v = v->parent();
1493
1494   Widget* widget = GetWidget();
1495   if (!v) {
1496     if (widget) {
1497       ui::Layer* layer = widget->GetLayer();
1498       if (layer)
1499         widget->GetRootView()->ReorderChildLayers(layer);
1500     }
1501   } else {
1502     v->ReorderChildLayers(v->layer());
1503   }
1504
1505   if (widget) {
1506     // Reorder the widget's child NativeViews in case a child NativeView is
1507     // associated with a view (eg via a NativeViewHost). Always do the
1508     // reordering because the associated NativeView's layer (if it has one)
1509     // is parented to the widget's layer regardless of whether the host view has
1510     // an ancestor with a layer.
1511     widget->ReorderNativeViews();
1512   }
1513 }
1514
1515 void View::ReorderChildLayers(ui::Layer* parent_layer) {
1516   if (layer() && layer() != parent_layer) {
1517     DCHECK_EQ(parent_layer, layer()->parent());
1518     parent_layer->StackAtBottom(layer());
1519   } else {
1520     // Iterate backwards through the children so that a child with a layer
1521     // which is further to the back is stacked above one which is further to
1522     // the front.
1523     for (Views::reverse_iterator it(children_.rbegin());
1524          it != children_.rend(); ++it) {
1525       (*it)->ReorderChildLayers(parent_layer);
1526     }
1527   }
1528 }
1529
1530 // Input -----------------------------------------------------------------------
1531
1532 View::DragInfo* View::GetDragInfo() {
1533   return parent_ ? parent_->GetDragInfo() : NULL;
1534 }
1535
1536 // Focus -----------------------------------------------------------------------
1537
1538 void View::OnFocus() {
1539   // TODO(beng): Investigate whether it's possible for us to move this to
1540   //             Focus().
1541   // By default, we clear the native focus. This ensures that no visible native
1542   // view as the focus and that we still receive keyboard inputs.
1543   FocusManager* focus_manager = GetFocusManager();
1544   if (focus_manager)
1545     focus_manager->ClearNativeFocus();
1546
1547   // TODO(beng): Investigate whether it's possible for us to move this to
1548   //             Focus().
1549   // Notify assistive technologies of the focus change.
1550   NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
1551 }
1552
1553 void View::OnBlur() {
1554 }
1555
1556 void View::Focus() {
1557   OnFocus();
1558 }
1559
1560 void View::Blur() {
1561   OnBlur();
1562 }
1563
1564 // Tooltips --------------------------------------------------------------------
1565
1566 void View::TooltipTextChanged() {
1567   Widget* widget = GetWidget();
1568   // TooltipManager may be null if there is a problem creating it.
1569   if (widget && widget->GetTooltipManager())
1570     widget->GetTooltipManager()->TooltipTextChanged(this);
1571 }
1572
1573 // Context menus ---------------------------------------------------------------
1574
1575 gfx::Point View::GetKeyboardContextMenuLocation() {
1576   gfx::Rect vis_bounds = GetVisibleBounds();
1577   gfx::Point screen_point(vis_bounds.x() + vis_bounds.width() / 2,
1578                           vis_bounds.y() + vis_bounds.height() / 2);
1579   ConvertPointToScreen(this, &screen_point);
1580   return screen_point;
1581 }
1582
1583 // Drag and drop ---------------------------------------------------------------
1584
1585 int View::GetDragOperations(const gfx::Point& press_pt) {
1586   return drag_controller_ ?
1587       drag_controller_->GetDragOperationsForView(this, press_pt) :
1588       ui::DragDropTypes::DRAG_NONE;
1589 }
1590
1591 void View::WriteDragData(const gfx::Point& press_pt, OSExchangeData* data) {
1592   DCHECK(drag_controller_);
1593   drag_controller_->WriteDragDataForView(this, press_pt, data);
1594 }
1595
1596 bool View::InDrag() {
1597   Widget* widget = GetWidget();
1598   return widget ? widget->dragged_view() == this : false;
1599 }
1600
1601 int View::GetHorizontalDragThreshold() {
1602   // TODO(jennyz): This value may need to be adjusted for different platforms
1603   // and for different display density.
1604   return kDefaultHorizontalDragThreshold;
1605 }
1606
1607 int View::GetVerticalDragThreshold() {
1608   // TODO(jennyz): This value may need to be adjusted for different platforms
1609   // and for different display density.
1610   return kDefaultVerticalDragThreshold;
1611 }
1612
1613 // Debugging -------------------------------------------------------------------
1614
1615 #if !defined(NDEBUG)
1616
1617 std::string View::PrintViewGraph(bool first) {
1618   return DoPrintViewGraph(first, this);
1619 }
1620
1621 std::string View::DoPrintViewGraph(bool first, View* view_with_children) {
1622   // 64-bit pointer = 16 bytes of hex + "0x" + '\0' = 19.
1623   const size_t kMaxPointerStringLength = 19;
1624
1625   std::string result;
1626
1627   if (first)
1628     result.append("digraph {\n");
1629
1630   // Node characteristics.
1631   char p[kMaxPointerStringLength];
1632
1633   const std::string class_name(GetClassName());
1634   size_t base_name_index = class_name.find_last_of('/');
1635   if (base_name_index == std::string::npos)
1636     base_name_index = 0;
1637   else
1638     base_name_index++;
1639
1640   char bounds_buffer[512];
1641
1642   // Information about current node.
1643   base::snprintf(p, arraysize(bounds_buffer), "%p", view_with_children);
1644   result.append("  N");
1645   result.append(p + 2);
1646   result.append(" [label=\"");
1647
1648   result.append(class_name.substr(base_name_index).c_str());
1649
1650   base::snprintf(bounds_buffer,
1651                  arraysize(bounds_buffer),
1652                  "\\n bounds: (%d, %d), (%dx%d)",
1653                  bounds().x(),
1654                  bounds().y(),
1655                  bounds().width(),
1656                  bounds().height());
1657   result.append(bounds_buffer);
1658
1659   gfx::DecomposedTransform decomp;
1660   if (!GetTransform().IsIdentity() &&
1661       gfx::DecomposeTransform(&decomp, GetTransform())) {
1662     base::snprintf(bounds_buffer,
1663                    arraysize(bounds_buffer),
1664                    "\\n translation: (%f, %f)",
1665                    decomp.translate[0],
1666                    decomp.translate[1]);
1667     result.append(bounds_buffer);
1668
1669     base::snprintf(bounds_buffer,
1670                    arraysize(bounds_buffer),
1671                    "\\n rotation: %3.2f",
1672                    std::acos(decomp.quaternion[3]) * 360.0 / M_PI);
1673     result.append(bounds_buffer);
1674
1675     base::snprintf(bounds_buffer,
1676                    arraysize(bounds_buffer),
1677                    "\\n scale: (%2.4f, %2.4f)",
1678                    decomp.scale[0],
1679                    decomp.scale[1]);
1680     result.append(bounds_buffer);
1681   }
1682
1683   result.append("\"");
1684   if (!parent_)
1685     result.append(", shape=box");
1686   if (layer()) {
1687     if (layer()->has_external_content())
1688       result.append(", color=green");
1689     else
1690       result.append(", color=red");
1691
1692     if (layer()->fills_bounds_opaquely())
1693       result.append(", style=filled");
1694   }
1695   result.append("]\n");
1696
1697   // Link to parent.
1698   if (parent_) {
1699     char pp[kMaxPointerStringLength];
1700
1701     base::snprintf(pp, kMaxPointerStringLength, "%p", parent_);
1702     result.append("  N");
1703     result.append(pp + 2);
1704     result.append(" -> N");
1705     result.append(p + 2);
1706     result.append("\n");
1707   }
1708
1709   // Children.
1710   for (int i = 0, count = view_with_children->child_count(); i < count; ++i)
1711     result.append(view_with_children->child_at(i)->PrintViewGraph(false));
1712
1713   if (first)
1714     result.append("}\n");
1715
1716   return result;
1717 }
1718 #endif
1719
1720 ////////////////////////////////////////////////////////////////////////////////
1721 // View, private:
1722
1723 // DropInfo --------------------------------------------------------------------
1724
1725 void View::DragInfo::Reset() {
1726   possible_drag = false;
1727   start_pt = gfx::Point();
1728 }
1729
1730 void View::DragInfo::PossibleDrag(const gfx::Point& p) {
1731   possible_drag = true;
1732   start_pt = p;
1733 }
1734
1735 // Painting --------------------------------------------------------------------
1736
1737 void View::SchedulePaintBoundsChanged(SchedulePaintType type) {
1738   // If we have a layer and the View's size did not change, we do not need to
1739   // schedule any paints since the layer will be redrawn at its new location
1740   // during the next Draw() cycle in the compositor.
1741   if (!layer() || type == SCHEDULE_PAINT_SIZE_CHANGED) {
1742     // Otherwise, if the size changes or we don't have a layer then we need to
1743     // use SchedulePaint to invalidate the area occupied by the View.
1744     SchedulePaint();
1745   } else if (parent_ && type == SCHEDULE_PAINT_SIZE_SAME) {
1746     // The compositor doesn't Draw() until something on screen changes, so
1747     // if our position changes but nothing is being animated on screen, then
1748     // tell the compositor to redraw the scene. We know layer() exists due to
1749     // the above if clause.
1750     layer()->ScheduleDraw();
1751   }
1752 }
1753
1754 // Tree operations -------------------------------------------------------------
1755
1756 void View::DoRemoveChildView(View* view,
1757                              bool update_focus_cycle,
1758                              bool update_tool_tip,
1759                              bool delete_removed_view,
1760                              View* new_parent) {
1761   DCHECK(view);
1762
1763   const Views::iterator i(std::find(children_.begin(), children_.end(), view));
1764   scoped_ptr<View> view_to_be_deleted;
1765   if (i != children_.end()) {
1766     if (update_focus_cycle) {
1767       // Let's remove the view from the focus traversal.
1768       View* next_focusable = view->next_focusable_view_;
1769       View* prev_focusable = view->previous_focusable_view_;
1770       if (prev_focusable)
1771         prev_focusable->next_focusable_view_ = next_focusable;
1772       if (next_focusable)
1773         next_focusable->previous_focusable_view_ = prev_focusable;
1774     }
1775
1776     if (GetWidget()) {
1777       UnregisterChildrenForVisibleBoundsNotification(view);
1778       if (view->visible())
1779         view->SchedulePaint();
1780       GetWidget()->NotifyWillRemoveView(view);
1781     }
1782
1783     view->PropagateRemoveNotifications(this, new_parent);
1784     view->parent_ = NULL;
1785     view->UpdateLayerVisibility();
1786
1787     if (delete_removed_view && !view->owned_by_client_)
1788       view_to_be_deleted.reset(view);
1789
1790     children_.erase(i);
1791   }
1792
1793   if (update_tool_tip)
1794     UpdateTooltip();
1795
1796   if (layout_manager_.get())
1797     layout_manager_->ViewRemoved(this, view);
1798 }
1799
1800 void View::PropagateRemoveNotifications(View* old_parent, View* new_parent) {
1801   for (int i = 0, count = child_count(); i < count; ++i)
1802     child_at(i)->PropagateRemoveNotifications(old_parent, new_parent);
1803
1804   ViewHierarchyChangedDetails details(false, old_parent, this, new_parent);
1805   for (View* v = this; v; v = v->parent_)
1806     v->ViewHierarchyChangedImpl(true, details);
1807 }
1808
1809 void View::PropagateAddNotifications(
1810     const ViewHierarchyChangedDetails& details) {
1811   for (int i = 0, count = child_count(); i < count; ++i)
1812     child_at(i)->PropagateAddNotifications(details);
1813   ViewHierarchyChangedImpl(true, details);
1814 }
1815
1816 void View::PropagateNativeViewHierarchyChanged() {
1817   for (int i = 0, count = child_count(); i < count; ++i)
1818     child_at(i)->PropagateNativeViewHierarchyChanged();
1819   NativeViewHierarchyChanged();
1820 }
1821
1822 void View::ViewHierarchyChangedImpl(
1823     bool register_accelerators,
1824     const ViewHierarchyChangedDetails& details) {
1825   if (register_accelerators) {
1826     if (details.is_add) {
1827       // If you get this registration, you are part of a subtree that has been
1828       // added to the view hierarchy.
1829       if (GetFocusManager())
1830         RegisterPendingAccelerators();
1831     } else {
1832       if (details.child == this)
1833         UnregisterAccelerators(true);
1834     }
1835   }
1836
1837   if (details.is_add && layer() && !layer()->parent()) {
1838     UpdateParentLayer();
1839     Widget* widget = GetWidget();
1840     if (widget)
1841       widget->UpdateRootLayers();
1842   } else if (!details.is_add && details.child == this) {
1843     // Make sure the layers belonging to the subtree rooted at |child| get
1844     // removed from layers that do not belong in the same subtree.
1845     OrphanLayers();
1846     Widget* widget = GetWidget();
1847     if (widget)
1848       widget->UpdateRootLayers();
1849   }
1850
1851   ViewHierarchyChanged(details);
1852   details.parent->needs_layout_ = true;
1853 }
1854
1855 void View::PropagateNativeThemeChanged(const ui::NativeTheme* theme) {
1856   for (int i = 0, count = child_count(); i < count; ++i)
1857     child_at(i)->PropagateNativeThemeChanged(theme);
1858   OnNativeThemeChanged(theme);
1859 }
1860
1861 // Size and disposition --------------------------------------------------------
1862
1863 void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
1864   for (int i = 0, count = child_count(); i < count; ++i)
1865     child_at(i)->PropagateVisibilityNotifications(start, is_visible);
1866   VisibilityChangedImpl(start, is_visible);
1867 }
1868
1869 void View::VisibilityChangedImpl(View* starting_from, bool is_visible) {
1870   VisibilityChanged(starting_from, is_visible);
1871 }
1872
1873 void View::BoundsChanged(const gfx::Rect& previous_bounds) {
1874   if (visible_) {
1875     // Paint the new bounds.
1876     SchedulePaintBoundsChanged(
1877         bounds_.size() == previous_bounds.size() ? SCHEDULE_PAINT_SIZE_SAME :
1878         SCHEDULE_PAINT_SIZE_CHANGED);
1879   }
1880
1881   if (layer()) {
1882     if (parent_) {
1883       SetLayerBounds(GetLocalBounds() +
1884                      gfx::Vector2d(GetMirroredX(), y()) +
1885                      parent_->CalculateOffsetToAncestorWithLayer(NULL));
1886     } else {
1887       SetLayerBounds(bounds_);
1888     }
1889
1890     // In RTL mode, if our width has changed, our children's mirrored bounds
1891     // will have changed. Update the child's layer bounds, or if it is not a
1892     // layer, the bounds of any layers inside the child.
1893     if (base::i18n::IsRTL() && bounds_.width() != previous_bounds.width()) {
1894       for (int i = 0; i < child_count(); ++i) {
1895         View* child = child_at(i);
1896         child->UpdateChildLayerBounds(
1897             gfx::Vector2d(child->GetMirroredX(), child->y()));
1898       }
1899     }
1900   } else {
1901     // If our bounds have changed, then any descendant layer bounds may have
1902     // changed. Update them accordingly.
1903     UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
1904   }
1905
1906   OnBoundsChanged(previous_bounds);
1907
1908   if (previous_bounds.size() != size()) {
1909     needs_layout_ = false;
1910     Layout();
1911   }
1912
1913   if (GetNeedsNotificationWhenVisibleBoundsChange())
1914     OnVisibleBoundsChanged();
1915
1916   // Notify interested Views that visible bounds within the root view may have
1917   // changed.
1918   if (descendants_to_notify_.get()) {
1919     for (Views::iterator i(descendants_to_notify_->begin());
1920          i != descendants_to_notify_->end(); ++i) {
1921       (*i)->OnVisibleBoundsChanged();
1922     }
1923   }
1924 }
1925
1926 // static
1927 void View::RegisterChildrenForVisibleBoundsNotification(View* view) {
1928   if (view->GetNeedsNotificationWhenVisibleBoundsChange())
1929     view->RegisterForVisibleBoundsNotification();
1930   for (int i = 0; i < view->child_count(); ++i)
1931     RegisterChildrenForVisibleBoundsNotification(view->child_at(i));
1932 }
1933
1934 // static
1935 void View::UnregisterChildrenForVisibleBoundsNotification(View* view) {
1936   if (view->GetNeedsNotificationWhenVisibleBoundsChange())
1937     view->UnregisterForVisibleBoundsNotification();
1938   for (int i = 0; i < view->child_count(); ++i)
1939     UnregisterChildrenForVisibleBoundsNotification(view->child_at(i));
1940 }
1941
1942 void View::RegisterForVisibleBoundsNotification() {
1943   if (registered_for_visible_bounds_notification_)
1944     return;
1945
1946   registered_for_visible_bounds_notification_ = true;
1947   for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
1948     ancestor->AddDescendantToNotify(this);
1949 }
1950
1951 void View::UnregisterForVisibleBoundsNotification() {
1952   if (!registered_for_visible_bounds_notification_)
1953     return;
1954
1955   registered_for_visible_bounds_notification_ = false;
1956   for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
1957     ancestor->RemoveDescendantToNotify(this);
1958 }
1959
1960 void View::AddDescendantToNotify(View* view) {
1961   DCHECK(view);
1962   if (!descendants_to_notify_.get())
1963     descendants_to_notify_.reset(new Views);
1964   descendants_to_notify_->push_back(view);
1965 }
1966
1967 void View::RemoveDescendantToNotify(View* view) {
1968   DCHECK(view && descendants_to_notify_.get());
1969   Views::iterator i(std::find(
1970       descendants_to_notify_->begin(), descendants_to_notify_->end(), view));
1971   DCHECK(i != descendants_to_notify_->end());
1972   descendants_to_notify_->erase(i);
1973   if (descendants_to_notify_->empty())
1974     descendants_to_notify_.reset();
1975 }
1976
1977 void View::SetLayerBounds(const gfx::Rect& bounds) {
1978   layer()->SetBounds(bounds);
1979   SnapLayerToPixelBoundary();
1980 }
1981
1982 // Transformations -------------------------------------------------------------
1983
1984 bool View::GetTransformRelativeTo(const View* ancestor,
1985                                   gfx::Transform* transform) const {
1986   const View* p = this;
1987
1988   while (p && p != ancestor) {
1989     transform->ConcatTransform(p->GetTransform());
1990     gfx::Transform translation;
1991     translation.Translate(static_cast<float>(p->GetMirroredX()),
1992                           static_cast<float>(p->y()));
1993     transform->ConcatTransform(translation);
1994
1995     p = p->parent_;
1996   }
1997
1998   return p == ancestor;
1999 }
2000
2001 // Coordinate conversion -------------------------------------------------------
2002
2003 bool View::ConvertPointForAncestor(const View* ancestor,
2004                                    gfx::Point* point) const {
2005   gfx::Transform trans;
2006   // TODO(sad): Have some way of caching the transformation results.
2007   bool result = GetTransformRelativeTo(ancestor, &trans);
2008   gfx::Point3F p(*point);
2009   trans.TransformPoint(&p);
2010   *point = gfx::ToFlooredPoint(p.AsPointF());
2011   return result;
2012 }
2013
2014 bool View::ConvertPointFromAncestor(const View* ancestor,
2015                                     gfx::Point* point) const {
2016   gfx::Transform trans;
2017   bool result = GetTransformRelativeTo(ancestor, &trans);
2018   gfx::Point3F p(*point);
2019   trans.TransformPointReverse(&p);
2020   *point = gfx::ToFlooredPoint(p.AsPointF());
2021   return result;
2022 }
2023
2024 bool View::ConvertRectForAncestor(const View* ancestor,
2025                                   gfx::RectF* rect) const {
2026   gfx::Transform trans;
2027   // TODO(sad): Have some way of caching the transformation results.
2028   bool result = GetTransformRelativeTo(ancestor, &trans);
2029   trans.TransformRect(rect);
2030   return result;
2031 }
2032
2033 bool View::ConvertRectFromAncestor(const View* ancestor,
2034                                    gfx::RectF* rect) const {
2035   gfx::Transform trans;
2036   bool result = GetTransformRelativeTo(ancestor, &trans);
2037   trans.TransformRectReverse(rect);
2038   return result;
2039 }
2040
2041 // Accelerated painting --------------------------------------------------------
2042
2043 void View::CreateLayer() {
2044   // A new layer is being created for the view. So all the layers of the
2045   // sub-tree can inherit the visibility of the corresponding view.
2046   for (int i = 0, count = child_count(); i < count; ++i)
2047     child_at(i)->UpdateChildLayerVisibility(true);
2048
2049   SetLayer(new ui::Layer());
2050   layer()->set_delegate(this);
2051 #if !defined(NDEBUG)
2052   layer()->set_name(GetClassName());
2053 #endif
2054
2055   UpdateParentLayers();
2056   UpdateLayerVisibility();
2057
2058   // The new layer needs to be ordered in the layer tree according
2059   // to the view tree. Children of this layer were added in order
2060   // in UpdateParentLayers().
2061   if (parent())
2062     parent()->ReorderLayers();
2063
2064   Widget* widget = GetWidget();
2065   if (widget)
2066     widget->UpdateRootLayers();
2067 }
2068
2069 void View::UpdateParentLayers() {
2070   // Attach all top-level un-parented layers.
2071   if (layer() && !layer()->parent()) {
2072     UpdateParentLayer();
2073   } else {
2074     for (int i = 0, count = child_count(); i < count; ++i)
2075       child_at(i)->UpdateParentLayers();
2076   }
2077 }
2078
2079 void View::OrphanLayers() {
2080   if (layer()) {
2081     if (layer()->parent())
2082       layer()->parent()->Remove(layer());
2083
2084     // The layer belonging to this View has already been orphaned. It is not
2085     // necessary to orphan the child layers.
2086     return;
2087   }
2088   for (int i = 0, count = child_count(); i < count; ++i)
2089     child_at(i)->OrphanLayers();
2090 }
2091
2092 void View::ReparentLayer(const gfx::Vector2d& offset, ui::Layer* parent_layer) {
2093   layer()->SetBounds(GetLocalBounds() + offset);
2094   DCHECK_NE(layer(), parent_layer);
2095   if (parent_layer)
2096     parent_layer->Add(layer());
2097   layer()->SchedulePaint(GetLocalBounds());
2098   MoveLayerToParent(layer(), gfx::Point());
2099 }
2100
2101 void View::DestroyLayer() {
2102   ui::Layer* new_parent = layer()->parent();
2103   std::vector<ui::Layer*> children = layer()->children();
2104   for (size_t i = 0; i < children.size(); ++i) {
2105     layer()->Remove(children[i]);
2106     if (new_parent)
2107       new_parent->Add(children[i]);
2108   }
2109
2110   LayerOwner::DestroyLayer();
2111
2112   if (new_parent)
2113     ReorderLayers();
2114
2115   UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
2116
2117   SchedulePaint();
2118
2119   Widget* widget = GetWidget();
2120   if (widget)
2121     widget->UpdateRootLayers();
2122 }
2123
2124 // Input -----------------------------------------------------------------------
2125
2126 bool View::ProcessMousePressed(const ui::MouseEvent& event) {
2127   int drag_operations =
2128       (enabled_ && event.IsOnlyLeftMouseButton() &&
2129        HitTestPoint(event.location())) ?
2130        GetDragOperations(event.location()) : 0;
2131   ContextMenuController* context_menu_controller = event.IsRightMouseButton() ?
2132       context_menu_controller_ : 0;
2133   View::DragInfo* drag_info = GetDragInfo();
2134
2135   // TODO(sky): for debugging 360238.
2136   int storage_id = 0;
2137   if (event.IsOnlyRightMouseButton() && context_menu_controller &&
2138       kContextMenuOnMousePress && HitTestPoint(event.location())) {
2139     ViewStorage* view_storage = ViewStorage::GetInstance();
2140     storage_id = view_storage->CreateStorageID();
2141     view_storage->StoreView(storage_id, this);
2142   }
2143
2144   const bool enabled = enabled_;
2145   const bool result = OnMousePressed(event);
2146
2147   if (!enabled)
2148     return result;
2149
2150   if (event.IsOnlyRightMouseButton() && context_menu_controller &&
2151       kContextMenuOnMousePress) {
2152     // Assume that if there is a context menu controller we won't be deleted
2153     // from mouse pressed.
2154     gfx::Point location(event.location());
2155     if (HitTestPoint(location)) {
2156       if (storage_id != 0)
2157         CHECK_EQ(this, ViewStorage::GetInstance()->RetrieveView(storage_id));
2158       ConvertPointToScreen(this, &location);
2159       ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
2160       return true;
2161     }
2162   }
2163
2164   // WARNING: we may have been deleted, don't use any View variables.
2165   if (drag_operations != ui::DragDropTypes::DRAG_NONE) {
2166     drag_info->PossibleDrag(event.location());
2167     return true;
2168   }
2169   return !!context_menu_controller || result;
2170 }
2171
2172 bool View::ProcessMouseDragged(const ui::MouseEvent& event) {
2173   // Copy the field, that way if we're deleted after drag and drop no harm is
2174   // done.
2175   ContextMenuController* context_menu_controller = context_menu_controller_;
2176   const bool possible_drag = GetDragInfo()->possible_drag;
2177   if (possible_drag &&
2178       ExceededDragThreshold(GetDragInfo()->start_pt - event.location()) &&
2179       (!drag_controller_ ||
2180        drag_controller_->CanStartDragForView(
2181            this, GetDragInfo()->start_pt, event.location()))) {
2182     DoDrag(event, GetDragInfo()->start_pt,
2183            ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
2184   } else {
2185     if (OnMouseDragged(event))
2186       return true;
2187     // Fall through to return value based on context menu controller.
2188   }
2189   // WARNING: we may have been deleted.
2190   return (context_menu_controller != NULL) || possible_drag;
2191 }
2192
2193 void View::ProcessMouseReleased(const ui::MouseEvent& event) {
2194   if (!kContextMenuOnMousePress && context_menu_controller_ &&
2195       event.IsOnlyRightMouseButton()) {
2196     // Assume that if there is a context menu controller we won't be deleted
2197     // from mouse released.
2198     gfx::Point location(event.location());
2199     OnMouseReleased(event);
2200     if (HitTestPoint(location)) {
2201       ConvertPointToScreen(this, &location);
2202       ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
2203     }
2204   } else {
2205     OnMouseReleased(event);
2206   }
2207   // WARNING: we may have been deleted.
2208 }
2209
2210 // Accelerators ----------------------------------------------------------------
2211
2212 void View::RegisterPendingAccelerators() {
2213   if (!accelerators_.get() ||
2214       registered_accelerator_count_ == accelerators_->size()) {
2215     // No accelerators are waiting for registration.
2216     return;
2217   }
2218
2219   if (!GetWidget()) {
2220     // The view is not yet attached to a widget, defer registration until then.
2221     return;
2222   }
2223
2224   accelerator_focus_manager_ = GetFocusManager();
2225   if (!accelerator_focus_manager_) {
2226     // Some crash reports seem to show that we may get cases where we have no
2227     // focus manager (see bug #1291225).  This should never be the case, just
2228     // making sure we don't crash.
2229     NOTREACHED();
2230     return;
2231   }
2232   for (std::vector<ui::Accelerator>::const_iterator i(
2233            accelerators_->begin() + registered_accelerator_count_);
2234        i != accelerators_->end(); ++i) {
2235     accelerator_focus_manager_->RegisterAccelerator(
2236         *i, ui::AcceleratorManager::kNormalPriority, this);
2237   }
2238   registered_accelerator_count_ = accelerators_->size();
2239 }
2240
2241 void View::UnregisterAccelerators(bool leave_data_intact) {
2242   if (!accelerators_.get())
2243     return;
2244
2245   if (GetWidget()) {
2246     if (accelerator_focus_manager_) {
2247       accelerator_focus_manager_->UnregisterAccelerators(this);
2248       accelerator_focus_manager_ = NULL;
2249     }
2250     if (!leave_data_intact) {
2251       accelerators_->clear();
2252       accelerators_.reset();
2253     }
2254     registered_accelerator_count_ = 0;
2255   }
2256 }
2257
2258 // Focus -----------------------------------------------------------------------
2259
2260 void View::InitFocusSiblings(View* v, int index) {
2261   int count = child_count();
2262
2263   if (count == 0) {
2264     v->next_focusable_view_ = NULL;
2265     v->previous_focusable_view_ = NULL;
2266   } else {
2267     if (index == count) {
2268       // We are inserting at the end, but the end of the child list may not be
2269       // the last focusable element. Let's try to find an element with no next
2270       // focusable element to link to.
2271       View* last_focusable_view = NULL;
2272       for (Views::iterator i(children_.begin()); i != children_.end(); ++i) {
2273           if (!(*i)->next_focusable_view_) {
2274             last_focusable_view = *i;
2275             break;
2276           }
2277       }
2278       if (last_focusable_view == NULL) {
2279         // Hum... there is a cycle in the focus list. Let's just insert ourself
2280         // after the last child.
2281         View* prev = children_[index - 1];
2282         v->previous_focusable_view_ = prev;
2283         v->next_focusable_view_ = prev->next_focusable_view_;
2284         prev->next_focusable_view_->previous_focusable_view_ = v;
2285         prev->next_focusable_view_ = v;
2286       } else {
2287         last_focusable_view->next_focusable_view_ = v;
2288         v->next_focusable_view_ = NULL;
2289         v->previous_focusable_view_ = last_focusable_view;
2290       }
2291     } else {
2292       View* prev = children_[index]->GetPreviousFocusableView();
2293       v->previous_focusable_view_ = prev;
2294       v->next_focusable_view_ = children_[index];
2295       if (prev)
2296         prev->next_focusable_view_ = v;
2297       children_[index]->previous_focusable_view_ = v;
2298     }
2299   }
2300 }
2301
2302 void View::AdvanceFocusIfNecessary() {
2303   // Focus should only be advanced if this is the focused view and has become
2304   // unfocusable. If the view is still focusable or is not focused, we can
2305   // return early avoiding furthur unnecessary checks. Focusability check is
2306   // performed first as it tends to be faster.
2307   if (IsAccessibilityFocusable() || !HasFocus())
2308     return;
2309
2310   FocusManager* focus_manager = GetFocusManager();
2311   if (focus_manager)
2312     focus_manager->AdvanceFocusIfNecessary();
2313 }
2314
2315 // System events ---------------------------------------------------------------
2316
2317 void View::PropagateThemeChanged() {
2318   for (int i = child_count() - 1; i >= 0; --i)
2319     child_at(i)->PropagateThemeChanged();
2320   OnThemeChanged();
2321 }
2322
2323 void View::PropagateLocaleChanged() {
2324   for (int i = child_count() - 1; i >= 0; --i)
2325     child_at(i)->PropagateLocaleChanged();
2326   OnLocaleChanged();
2327 }
2328
2329 void View::PropagateDeviceScaleFactorChanged(float device_scale_factor) {
2330   for (int i = child_count() - 1; i >= 0; --i)
2331     child_at(i)->PropagateDeviceScaleFactorChanged(device_scale_factor);
2332
2333   // If the view is drawing to the layer, OnDeviceScaleFactorChanged() is called
2334   // through LayerDelegate callback.
2335   if (!layer())
2336     OnDeviceScaleFactorChanged(device_scale_factor);
2337 }
2338
2339 // Tooltips --------------------------------------------------------------------
2340
2341 void View::UpdateTooltip() {
2342   Widget* widget = GetWidget();
2343   // TODO(beng): The TooltipManager NULL check can be removed when we
2344   //             consolidate Init() methods and make views_unittests Init() all
2345   //             Widgets that it uses.
2346   if (widget && widget->GetTooltipManager())
2347     widget->GetTooltipManager()->UpdateTooltip();
2348 }
2349
2350 // Drag and drop ---------------------------------------------------------------
2351
2352 bool View::DoDrag(const ui::LocatedEvent& event,
2353                   const gfx::Point& press_pt,
2354                   ui::DragDropTypes::DragEventSource source) {
2355   int drag_operations = GetDragOperations(press_pt);
2356   if (drag_operations == ui::DragDropTypes::DRAG_NONE)
2357     return false;
2358
2359   Widget* widget = GetWidget();
2360   // We should only start a drag from an event, implying we have a widget.
2361   DCHECK(widget);
2362
2363   // Don't attempt to start a drag while in the process of dragging. This is
2364   // especially important on X where we can get multiple mouse move events when
2365   // we start the drag.
2366   if (widget->dragged_view())
2367     return false;
2368
2369   OSExchangeData data;
2370   WriteDragData(press_pt, &data);
2371
2372   // Message the RootView to do the drag and drop. That way if we're removed
2373   // the RootView can detect it and avoid calling us back.
2374   gfx::Point widget_location(event.location());
2375   ConvertPointToWidget(this, &widget_location);
2376   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
2377   // WARNING: we may have been deleted.
2378   return true;
2379 }
2380
2381 }  // namespace views