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