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(parent_context, offset_to_parent);
 749
 750   bool is_invalidated = true;
 751   if (context.CanCheckInvalid()) {
 752 #if DCHECK_IS_ON()
 753     gfx::Vector2d offset;
 754     context.Visited(this);
 755     View* view = this;
 756     while (view->parent() && !view->layer()) {
 757       DCHECK(view->GetTransform().IsIdentity());
 758       offset += view->GetMirroredPosition().OffsetFromOrigin();
 759       view = view->parent();
 760     }
 761     // The offset in the PaintContext should be the offset up to the paint root,
 762     // which we compute and verify here.
 763     DCHECK_EQ(context.PaintOffset().x(), offset.x());
 764     DCHECK_EQ(context.PaintOffset().y(), offset.y());
 765     // The above loop will stop when |view| is the paint root, which should be
 766     // the root of the current paint walk, as verified by storing the root in
 767     // the PaintContext.
 768     DCHECK_EQ(context.RootVisited(), view);
 769 #endif
 770
 771     // If the View wasn't invalidated, don't waste time painting it, the output
 772     // would be culled.
 773     is_invalidated = context.IsRectInvalid(GetLocalBounds());
 774   }
 775
 776   if (!is_invalidated && context.ShouldEarlyOutOfPaintingWhenValid())
 777     return;
 778
 779   TRACE_EVENT1("views", "View::Paint", "class", GetClassName());
 780
 781   // If the view is backed by a layer, it should paint with itself as the origin
 782   // rather than relative to its parent.
 783   ui::ClipTransformRecorder clip_transform_recorder(context);
 784   if (!layer()) {
 785     // Set the clip rect to the bounds of this View. Note that the X (or left)
 786     // position we pass to ClipRect takes into consideration whether or not the
 787     // View uses a right-to-left layout so that we paint the View in its
 788     // mirrored position if need be.
 789     gfx::Rect clip_rect_in_parent = bounds();
 790     clip_rect_in_parent.Inset(clip_insets_);
 791     if (parent_)
 792       clip_rect_in_parent.set_x(
 793           parent_->GetMirroredXForRect(clip_rect_in_parent));
 794     clip_transform_recorder.ClipRect(clip_rect_in_parent);
 795
 796     // Translate the graphics such that 0,0 corresponds to where
 797     // this View is located relative to its parent.
 798     gfx::Transform transform_from_parent;
 799     gfx::Vector2d offset_from_parent = GetMirroredPosition().OffsetFromOrigin();
 800     transform_from_parent.Translate(offset_from_parent.x(),
 801                                     offset_from_parent.y());
 802     transform_from_parent.PreconcatTransform(GetTransform());
 803     clip_transform_recorder.Transform(transform_from_parent);
 804   }
 805
 806   if (is_invalidated || !paint_cache_.UseCache(context)) {
 807     ui::PaintRecorder recorder(context, &paint_cache_);
 808     gfx::Canvas* canvas = recorder.canvas();
 809     // TODO(danakj): This is not needed with impl-side/slimming paint.
 810     gfx::ScopedCanvas scoped_canvas(canvas);
 811
 812     // If the View we are about to paint requested the canvas to be flipped, we
 813     // should change the transform appropriately.
 814     // The canvas mirroring is undone once the View is done painting so that we
 815     // don't pass the canvas with the mirrored transform to Views that didn't
 816     // request the canvas to be flipped.
 817     if (FlipCanvasOnPaintForRTLUI()) {
 818       canvas->Translate(gfx::Vector2d(width(), 0));
 819       canvas->Scale(-1, 1);
 820     }
 821
 822     // Delegate painting the contents of the View to the virtual OnPaint method.
 823     OnPaint(canvas);
 824   }
 825
 826   // View::Paint() recursion over the subtree.
 827   PaintChildren(context);
 828 }
 829
 830 void View::set_background(Background* b) {
 831   background_.reset(b);
 832 }
 833
 834 void View::SetBorder(scoped_ptr<Border> b) { border_ = b.Pass(); }
 835
 836 ui::ThemeProvider* View::GetThemeProvider() const {
 837   const Widget* widget = GetWidget();
 838   return widget ? widget->GetThemeProvider() : NULL;
 839 }
 840
 841 const ui::NativeTheme* View::GetNativeTheme() const {
 842   const Widget* widget = GetWidget();
 843   return widget ? widget->GetNativeTheme() : ui::NativeTheme::instance();
 844 }
 845
 846 // Input -----------------------------------------------------------------------
 847
 848 View* View::GetEventHandlerForPoint(const gfx::Point& point) {
 849   return GetEventHandlerForRect(gfx::Rect(point, gfx::Size(1, 1)));
 850 }
 851
 852 View* View::GetEventHandlerForRect(const gfx::Rect& rect) {
 853   return GetEffectiveViewTargeter()->TargetForRect(this, rect);
 854 }
 855
 856 bool View::CanProcessEventsWithinSubtree() const {
 857   return true;
 858 }
 859
 860 View* View::GetTooltipHandlerForPoint(const gfx::Point& point) {
 861   // TODO(tdanderson): Move this implementation into ViewTargetDelegate.
 862   if (!HitTestPoint(point) || !CanProcessEventsWithinSubtree())
 863     return NULL;
 864
 865   // Walk the child Views recursively looking for the View that most
 866   // tightly encloses the specified point.
 867   for (int i = child_count() - 1; i >= 0; --i) {
 868     View* child = child_at(i);
 869     if (!child->visible())
 870       continue;
 871
 872     gfx::Point point_in_child_coords(point);
 873     ConvertPointToTarget(this, child, &point_in_child_coords);
 874     View* handler = child->GetTooltipHandlerForPoint(point_in_child_coords);
 875     if (handler)
 876       return handler;
 877   }
 878   return this;
 879 }
 880
 881 gfx::NativeCursor View::GetCursor(const ui::MouseEvent& event) {
 882 #if defined(OS_WIN)
 883   static ui::Cursor arrow;
 884   if (!arrow.platform())
 885     arrow.SetPlatformCursor(LoadCursor(NULL, IDC_ARROW));
 886   return arrow;
 887 #else
 888   return gfx::kNullCursor;
 889 #endif
 890 }
 891
 892 bool View::HitTestPoint(const gfx::Point& point) const {
 893   return HitTestRect(gfx::Rect(point, gfx::Size(1, 1)));
 894 }
 895
 896 bool View::HitTestRect(const gfx::Rect& rect) const {
 897   return GetEffectiveViewTargeter()->DoesIntersectRect(this, rect);
 898 }
 899
 900 bool View::IsMouseHovered() {
 901   // If we haven't yet been placed in an onscreen view hierarchy, we can't be
 902   // hovered.
 903   if (!GetWidget())
 904     return false;
 905
 906   // If mouse events are disabled, then the mouse cursor is invisible and
 907   // is therefore not hovering over this button.
 908   if (!GetWidget()->IsMouseEventsEnabled())
 909     return false;
 910
 911   gfx::Point cursor_pos(gfx::Screen::GetScreenFor(
 912       GetWidget()->GetNativeView())->GetCursorScreenPoint());
 913   ConvertPointFromScreen(this, &cursor_pos);
 914   return HitTestPoint(cursor_pos);
 915 }
 916
 917 bool View::OnMousePressed(const ui::MouseEvent& event) {
 918   return false;
 919 }
 920
 921 bool View::OnMouseDragged(const ui::MouseEvent& event) {
 922   return false;
 923 }
 924
 925 void View::OnMouseReleased(const ui::MouseEvent& event) {
 926 }
 927
 928 void View::OnMouseCaptureLost() {
 929 }
 930
 931 void View::OnMouseMoved(const ui::MouseEvent& event) {
 932 }
 933
 934 void View::OnMouseEntered(const ui::MouseEvent& event) {
 935 }
 936
 937 void View::OnMouseExited(const ui::MouseEvent& event) {
 938 }
 939
 940 void View::SetMouseHandler(View* new_mouse_handler) {
 941   // |new_mouse_handler| may be NULL.
 942   if (parent_)
 943     parent_->SetMouseHandler(new_mouse_handler);
 944 }
 945
 946 bool View::OnKeyPressed(const ui::KeyEvent& event) {
 947   return false;
 948 }
 949
 950 bool View::OnKeyReleased(const ui::KeyEvent& event) {
 951   return false;
 952 }
 953
 954 bool View::OnMouseWheel(const ui::MouseWheelEvent& event) {
 955   return false;
 956 }
 957
 958 void View::OnKeyEvent(ui::KeyEvent* event) {
 959   bool consumed = (event->type() == ui::ET_KEY_PRESSED) ? OnKeyPressed(*event) :
 960                                                           OnKeyReleased(*event);
 961   if (consumed)
 962     event->StopPropagation();
 963 }
 964
 965 void View::OnMouseEvent(ui::MouseEvent* event) {
 966   switch (event->type()) {
 967     case ui::ET_MOUSE_PRESSED:
 968       if (ProcessMousePressed(*event))
 969         event->SetHandled();
 970       return;
 971
 972     case ui::ET_MOUSE_MOVED:
 973       if ((event->flags() & (ui::EF_LEFT_MOUSE_BUTTON |
 974                              ui::EF_RIGHT_MOUSE_BUTTON |
 975                              ui::EF_MIDDLE_MOUSE_BUTTON)) == 0) {
 976         OnMouseMoved(*event);
 977         return;
 978       }
 979       // FALL-THROUGH
 980     case ui::ET_MOUSE_DRAGGED:
 981       if (ProcessMouseDragged(*event))
 982         event->SetHandled();
 983       return;
 984
 985     case ui::ET_MOUSE_RELEASED:
 986       ProcessMouseReleased(*event);
 987       return;
 988
 989     case ui::ET_MOUSEWHEEL:
 990       if (OnMouseWheel(*static_cast<ui::MouseWheelEvent*>(event)))
 991         event->SetHandled();
 992       break;
 993
 994     case ui::ET_MOUSE_ENTERED:
 995       if (event->flags() & ui::EF_TOUCH_ACCESSIBILITY)
 996         NotifyAccessibilityEvent(ui::AX_EVENT_HOVER, true);
 997       OnMouseEntered(*event);
 998       break;
 999
1000     case ui::ET_MOUSE_EXITED:
1001       OnMouseExited(*event);
1002       break;
1003
1004     default:
1005       return;
1006   }
1007 }
1008
1009 void View::OnScrollEvent(ui::ScrollEvent* event) {
1010 }
1011
1012 void View::OnTouchEvent(ui::TouchEvent* event) {
1013   NOTREACHED() << "Views should not receive touch events.";
1014 }
1015
1016 void View::OnGestureEvent(ui::GestureEvent* event) {
1017 }
1018
1019 ui::TextInputClient* View::GetTextInputClient() {
1020   return NULL;
1021 }
1022
1023 InputMethod* View::GetInputMethod() {
1024   Widget* widget = GetWidget();
1025   return widget ? widget->GetInputMethod() : NULL;
1026 }
1027
1028 const InputMethod* View::GetInputMethod() const {
1029   const Widget* widget = GetWidget();
1030   return widget ? widget->GetInputMethod() : NULL;
1031 }
1032
1033 scoped_ptr<ViewTargeter>
1034 View::SetEventTargeter(scoped_ptr<ViewTargeter> targeter) {
1035   scoped_ptr<ViewTargeter> old_targeter = targeter_.Pass();
1036   targeter_ = targeter.Pass();
1037   return old_targeter.Pass();
1038 }
1039
1040 ViewTargeter* View::GetEffectiveViewTargeter() const {
1041   DCHECK(GetWidget());
1042   ViewTargeter* view_targeter = targeter();
1043   if (!view_targeter)
1044     view_targeter = GetWidget()->GetRootView()->targeter();
1045   CHECK(view_targeter);
1046   return view_targeter;
1047 }
1048
1049 bool View::CanAcceptEvent(const ui::Event& event) {
1050   return IsDrawn();
1051 }
1052
1053 ui::EventTarget* View::GetParentTarget() {
1054   return parent_;
1055 }
1056
1057 scoped_ptr<ui::EventTargetIterator> View::GetChildIterator() const {
1058   return make_scoped_ptr(new ui::EventTargetIteratorImpl<View>(children_));
1059 }
1060
1061 ui::EventTargeter* View::GetEventTargeter() {
1062   return targeter_.get();
1063 }
1064
1065 void View::ConvertEventToTarget(ui::EventTarget* target,
1066                                 ui::LocatedEvent* event) {
1067   event->ConvertLocationToTarget(this, static_cast<View*>(target));
1068 }
1069
1070 // Accelerators ----------------------------------------------------------------
1071
1072 void View::AddAccelerator(const ui::Accelerator& accelerator) {
1073   if (!accelerators_.get())
1074     accelerators_.reset(new std::vector<ui::Accelerator>());
1075
1076   if (std::find(accelerators_->begin(), accelerators_->end(), accelerator) ==
1077       accelerators_->end()) {
1078     accelerators_->push_back(accelerator);
1079   }
1080   RegisterPendingAccelerators();
1081 }
1082
1083 void View::RemoveAccelerator(const ui::Accelerator& accelerator) {
1084   if (!accelerators_.get()) {
1085     NOTREACHED() << "Removing non-existing accelerator";
1086     return;
1087   }
1088
1089   std::vector<ui::Accelerator>::iterator i(
1090       std::find(accelerators_->begin(), accelerators_->end(), accelerator));
1091   if (i == accelerators_->end()) {
1092     NOTREACHED() << "Removing non-existing accelerator";
1093     return;
1094   }
1095
1096   size_t index = i - accelerators_->begin();
1097   accelerators_->erase(i);
1098   if (index >= registered_accelerator_count_) {
1099     // The accelerator is not registered to FocusManager.
1100     return;
1101   }
1102   --registered_accelerator_count_;
1103
1104   // Providing we are attached to a Widget and registered with a focus manager,
1105   // we should de-register from that focus manager now.
1106   if (GetWidget() && accelerator_focus_manager_)
1107     accelerator_focus_manager_->UnregisterAccelerator(accelerator, this);
1108 }
1109
1110 void View::ResetAccelerators() {
1111   if (accelerators_.get())
1112     UnregisterAccelerators(false);
1113 }
1114
1115 bool View::AcceleratorPressed(const ui::Accelerator& accelerator) {
1116   return false;
1117 }
1118
1119 bool View::CanHandleAccelerators() const {
1120   return enabled() && IsDrawn() && GetWidget() && GetWidget()->IsVisible();
1121 }
1122
1123 // Focus -----------------------------------------------------------------------
1124
1125 bool View::HasFocus() const {
1126   const FocusManager* focus_manager = GetFocusManager();
1127   return focus_manager && (focus_manager->GetFocusedView() == this);
1128 }
1129
1130 View* View::GetNextFocusableView() {
1131   return next_focusable_view_;
1132 }
1133
1134 const View* View::GetNextFocusableView() const {
1135   return next_focusable_view_;
1136 }
1137
1138 View* View::GetPreviousFocusableView() {
1139   return previous_focusable_view_;
1140 }
1141
1142 void View::SetNextFocusableView(View* view) {
1143   if (view)
1144     view->previous_focusable_view_ = this;
1145   next_focusable_view_ = view;
1146 }
1147
1148 void View::SetFocusable(bool focusable) {
1149   if (focusable_ == focusable)
1150     return;
1151
1152   focusable_ = focusable;
1153   AdvanceFocusIfNecessary();
1154 }
1155
1156 bool View::IsFocusable() const {
1157   return focusable_ && enabled_ && IsDrawn();
1158 }
1159
1160 bool View::IsAccessibilityFocusable() const {
1161   return (focusable_ || accessibility_focusable_) && enabled_ && IsDrawn();
1162 }
1163
1164 void View::SetAccessibilityFocusable(bool accessibility_focusable) {
1165   if (accessibility_focusable_ == accessibility_focusable)
1166     return;
1167
1168   accessibility_focusable_ = accessibility_focusable;
1169   AdvanceFocusIfNecessary();
1170 }
1171
1172 FocusManager* View::GetFocusManager() {
1173   Widget* widget = GetWidget();
1174   return widget ? widget->GetFocusManager() : NULL;
1175 }
1176
1177 const FocusManager* View::GetFocusManager() const {
1178   const Widget* widget = GetWidget();
1179   return widget ? widget->GetFocusManager() : NULL;
1180 }
1181
1182 void View::RequestFocus() {
1183   FocusManager* focus_manager = GetFocusManager();
1184   if (focus_manager && IsFocusable())
1185     focus_manager->SetFocusedView(this);
1186 }
1187
1188 bool View::SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) {
1189   return false;
1190 }
1191
1192 FocusTraversable* View::GetFocusTraversable() {
1193   return NULL;
1194 }
1195
1196 FocusTraversable* View::GetPaneFocusTraversable() {
1197   return NULL;
1198 }
1199
1200 // Tooltips --------------------------------------------------------------------
1201
1202 bool View::GetTooltipText(const gfx::Point& p, base::string16* tooltip) const {
1203   return false;
1204 }
1205
1206 bool View::GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) const {
1207   return false;
1208 }
1209
1210 // Context menus ---------------------------------------------------------------
1211
1212 void View::ShowContextMenu(const gfx::Point& p,
1213                            ui::MenuSourceType source_type) {
1214   if (!context_menu_controller_)
1215     return;
1216
1217   context_menu_controller_->ShowContextMenuForView(this, p, source_type);
1218 }
1219
1220 // static
1221 bool View::ShouldShowContextMenuOnMousePress() {
1222   return kContextMenuOnMousePress;
1223 }
1224
1225 gfx::Point View::GetKeyboardContextMenuLocation() {
1226   gfx::Rect vis_bounds = GetVisibleBounds();
1227   gfx::Point screen_point(vis_bounds.x() + vis_bounds.width() / 2,
1228                           vis_bounds.y() + vis_bounds.height() / 2);
1229   ConvertPointToScreen(this, &screen_point);
1230   return screen_point;
1231 }
1232
1233 // Drag and drop ---------------------------------------------------------------
1234
1235 bool View::GetDropFormats(
1236       int* formats,
1237       std::set<OSExchangeData::CustomFormat>* custom_formats) {
1238   return false;
1239 }
1240
1241 bool View::AreDropTypesRequired() {
1242   return false;
1243 }
1244
1245 bool View::CanDrop(const OSExchangeData& data) {
1246   // TODO(sky): when I finish up migration, this should default to true.
1247   return false;
1248 }
1249
1250 void View::OnDragEntered(const ui::DropTargetEvent& event) {
1251 }
1252
1253 int View::OnDragUpdated(const ui::DropTargetEvent& event) {
1254   return ui::DragDropTypes::DRAG_NONE;
1255 }
1256
1257 void View::OnDragExited() {
1258 }
1259
1260 int View::OnPerformDrop(const ui::DropTargetEvent& event) {
1261   return ui::DragDropTypes::DRAG_NONE;
1262 }
1263
1264 void View::OnDragDone() {
1265 }
1266
1267 // static
1268 bool View::ExceededDragThreshold(const gfx::Vector2d& delta) {
1269   return (abs(delta.x()) > GetHorizontalDragThreshold() ||
1270           abs(delta.y()) > GetVerticalDragThreshold());
1271 }
1272
1273 // Accessibility----------------------------------------------------------------
1274
1275 gfx::NativeViewAccessible View::GetNativeViewAccessible() {
1276   if (!native_view_accessibility_)
1277     native_view_accessibility_ = NativeViewAccessibility::Create(this);
1278   if (native_view_accessibility_)
1279     return native_view_accessibility_->GetNativeObject();
1280   return NULL;
1281 }
1282
1283 void View::NotifyAccessibilityEvent(
1284     ui::AXEvent event_type,
1285     bool send_native_event) {
1286   if (ViewsDelegate::views_delegate)
1287     ViewsDelegate::views_delegate->NotifyAccessibilityEvent(this, event_type);
1288
1289   if (send_native_event && GetWidget()) {
1290     if (!native_view_accessibility_)
1291       native_view_accessibility_ = NativeViewAccessibility::Create(this);
1292     if (native_view_accessibility_)
1293       native_view_accessibility_->NotifyAccessibilityEvent(event_type);
1294   }
1295 }
1296
1297 // Scrolling -------------------------------------------------------------------
1298
1299 void View::ScrollRectToVisible(const gfx::Rect& rect) {
1300   // We must take RTL UI mirroring into account when adjusting the position of
1301   // the region.
1302   if (parent_) {
1303     gfx::Rect scroll_rect(rect);
1304     scroll_rect.Offset(GetMirroredX(), y());
1305     parent_->ScrollRectToVisible(scroll_rect);
1306   }
1307 }
1308
1309 int View::GetPageScrollIncrement(ScrollView* scroll_view,
1310                                  bool is_horizontal, bool is_positive) {
1311   return 0;
1312 }
1313
1314 int View::GetLineScrollIncrement(ScrollView* scroll_view,
1315                                  bool is_horizontal, bool is_positive) {
1316   return 0;
1317 }
1318
1319 ////////////////////////////////////////////////////////////////////////////////
1320 // View, protected:
1321
1322 // Size and disposition --------------------------------------------------------
1323
1324 void View::OnBoundsChanged(const gfx::Rect& previous_bounds) {
1325 }
1326
1327 void View::PreferredSizeChanged() {
1328   InvalidateLayout();
1329   if (parent_)
1330     parent_->ChildPreferredSizeChanged(this);
1331 }
1332
1333 bool View::GetNeedsNotificationWhenVisibleBoundsChange() const {
1334   return false;
1335 }
1336
1337 void View::OnVisibleBoundsChanged() {
1338 }
1339
1340 // Tree operations -------------------------------------------------------------
1341
1342 void View::ViewHierarchyChanged(const ViewHierarchyChangedDetails& details) {
1343 }
1344
1345 void View::VisibilityChanged(View* starting_from, bool is_visible) {
1346 }
1347
1348 void View::NativeViewHierarchyChanged() {
1349   FocusManager* focus_manager = GetFocusManager();
1350   if (accelerator_focus_manager_ != focus_manager) {
1351     UnregisterAccelerators(true);
1352
1353     if (focus_manager)
1354       RegisterPendingAccelerators();
1355   }
1356 }
1357
1358 // Painting --------------------------------------------------------------------
1359
1360 void View::PaintChildren(const ui::PaintContext& context) {
1361   TRACE_EVENT1("views", "View::PaintChildren", "class", GetClassName());
1362   for (int i = 0, count = child_count(); i < count; ++i)
1363     if (!child_at(i)->layer())
1364       child_at(i)->Paint(context);
1365 }
1366
1367 void View::OnPaint(gfx::Canvas* canvas) {
1368   TRACE_EVENT1("views", "View::OnPaint", "class", GetClassName());
1369   OnPaintBackground(canvas);
1370   OnPaintBorder(canvas);
1371 }
1372
1373 void View::OnPaintBackground(gfx::Canvas* canvas) {
1374   if (background_.get()) {
1375     TRACE_EVENT2("views", "View::OnPaintBackground",
1376                  "width", canvas->sk_canvas()->getDevice()->width(),
1377                  "height", canvas->sk_canvas()->getDevice()->height());
1378     background_->Paint(canvas, this);
1379   }
1380 }
1381
1382 void View::OnPaintBorder(gfx::Canvas* canvas) {
1383   if (border_.get()) {
1384     TRACE_EVENT2("views", "View::OnPaintBorder",
1385                  "width", canvas->sk_canvas()->getDevice()->width(),
1386                  "height", canvas->sk_canvas()->getDevice()->height());
1387     border_->Paint(*this, canvas);
1388   }
1389 }
1390
1391 // Accelerated Painting --------------------------------------------------------
1392
1393 void View::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
1394   // This method should not have the side-effect of creating the layer.
1395   if (layer())
1396     layer()->SetFillsBoundsOpaquely(fills_bounds_opaquely);
1397 }
1398
1399 gfx::Vector2d View::CalculateOffsetToAncestorWithLayer(
1400     ui::Layer** layer_parent) {
1401   if (layer()) {
1402     if (layer_parent)
1403       *layer_parent = layer();
1404     return gfx::Vector2d();
1405   }
1406   if (!parent_)
1407     return gfx::Vector2d();
1408
1409   return gfx::Vector2d(GetMirroredX(), y()) +
1410       parent_->CalculateOffsetToAncestorWithLayer(layer_parent);
1411 }
1412
1413 void View::UpdateParentLayer() {
1414   if (!layer())
1415     return;
1416
1417   ui::Layer* parent_layer = NULL;
1418   gfx::Vector2d offset(GetMirroredX(), y());
1419
1420   if (parent_)
1421     offset += parent_->CalculateOffsetToAncestorWithLayer(&parent_layer);
1422
1423   ReparentLayer(offset, parent_layer);
1424 }
1425
1426 void View::MoveLayerToParent(ui::Layer* parent_layer,
1427                              const gfx::Point& point) {
1428   gfx::Point local_point(point);
1429   if (parent_layer != layer())
1430     local_point.Offset(GetMirroredX(), y());
1431   if (layer() && parent_layer != layer()) {
1432     parent_layer->Add(layer());
1433     SetLayerBounds(gfx::Rect(local_point.x(), local_point.y(),
1434                              width(), height()));
1435   } else {
1436     for (int i = 0, count = child_count(); i < count; ++i)
1437       child_at(i)->MoveLayerToParent(parent_layer, local_point);
1438   }
1439 }
1440
1441 void View::UpdateLayerVisibility() {
1442   bool visible = visible_;
1443   for (const View* v = parent_; visible && v && !v->layer(); v = v->parent_)
1444     visible = v->visible();
1445
1446   UpdateChildLayerVisibility(visible);
1447 }
1448
1449 void View::UpdateChildLayerVisibility(bool ancestor_visible) {
1450   if (layer()) {
1451     layer()->SetVisible(ancestor_visible && visible_);
1452   } else {
1453     for (int i = 0, count = child_count(); i < count; ++i)
1454       child_at(i)->UpdateChildLayerVisibility(ancestor_visible && visible_);
1455   }
1456 }
1457
1458 void View::UpdateChildLayerBounds(const gfx::Vector2d& offset) {
1459   if (layer()) {
1460     SetLayerBounds(GetLocalBounds() + offset);
1461   } else {
1462     for (int i = 0, count = child_count(); i < count; ++i) {
1463       View* child = child_at(i);
1464       child->UpdateChildLayerBounds(
1465           offset + gfx::Vector2d(child->GetMirroredX(), child->y()));
1466     }
1467   }
1468 }
1469
1470 void View::OnPaintLayer(const ui::PaintContext& context) {
1471   if (!layer()->fills_bounds_opaquely()) {
1472     ui::PaintRecorder recorder(context);
1473     recorder.canvas()->DrawColor(SK_ColorBLACK, SkXfermode::kClear_Mode);
1474   }
1475   if (!visible_)
1476     return;
1477   Paint(context);
1478 }
1479
1480 void View::OnDelegatedFrameDamage(
1481     const gfx::Rect& damage_rect_in_dip) {
1482 }
1483
1484 void View::OnDeviceScaleFactorChanged(float device_scale_factor) {
1485   snap_layer_to_pixel_boundary_ =
1486       (device_scale_factor - std::floor(device_scale_factor)) != 0.0f;
1487   SnapLayerToPixelBoundary();
1488   // Repainting with new scale factor will paint the content at the right scale.
1489 }
1490
1491 base::Closure View::PrepareForLayerBoundsChange() {
1492   return base::Closure();
1493 }
1494
1495 void View::ReorderLayers() {
1496   View* v = this;
1497   while (v && !v->layer())
1498     v = v->parent();
1499
1500   Widget* widget = GetWidget();
1501   if (!v) {
1502     if (widget) {
1503       ui::Layer* layer = widget->GetLayer();
1504       if (layer)
1505         widget->GetRootView()->ReorderChildLayers(layer);
1506     }
1507   } else {
1508     v->ReorderChildLayers(v->layer());
1509   }
1510
1511   if (widget) {
1512     // Reorder the widget's child NativeViews in case a child NativeView is
1513     // associated with a view (eg via a NativeViewHost). Always do the
1514     // reordering because the associated NativeView's layer (if it has one)
1515     // is parented to the widget's layer regardless of whether the host view has
1516     // an ancestor with a layer.
1517     widget->ReorderNativeViews();
1518   }
1519 }
1520
1521 void View::ReorderChildLayers(ui::Layer* parent_layer) {
1522   if (layer() && layer() != parent_layer) {
1523     DCHECK_EQ(parent_layer, layer()->parent());
1524     parent_layer->StackAtBottom(layer());
1525   } else {
1526     // Iterate backwards through the children so that a child with a layer
1527     // which is further to the back is stacked above one which is further to
1528     // the front.
1529     for (Views::reverse_iterator it(children_.rbegin());
1530          it != children_.rend(); ++it) {
1531       (*it)->ReorderChildLayers(parent_layer);
1532     }
1533   }
1534 }
1535
1536 // Input -----------------------------------------------------------------------
1537
1538 View::DragInfo* View::GetDragInfo() {
1539   return parent_ ? parent_->GetDragInfo() : NULL;
1540 }
1541
1542 // Focus -----------------------------------------------------------------------
1543
1544 void View::OnFocus() {
1545   // TODO(beng): Investigate whether it's possible for us to move this to
1546   //             Focus().
1547   // By default, we clear the native focus. This ensures that no visible native
1548   // view as the focus and that we still receive keyboard inputs.
1549   FocusManager* focus_manager = GetFocusManager();
1550   if (focus_manager)
1551     focus_manager->ClearNativeFocus();
1552
1553   // TODO(beng): Investigate whether it's possible for us to move this to
1554   //             Focus().
1555   // Notify assistive technologies of the focus change.
1556   NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
1557 }
1558
1559 void View::OnBlur() {
1560 }
1561
1562 void View::Focus() {
1563   OnFocus();
1564 }
1565
1566 void View::Blur() {
1567   OnBlur();
1568 }
1569
1570 // Tooltips --------------------------------------------------------------------
1571
1572 void View::TooltipTextChanged() {
1573   Widget* widget = GetWidget();
1574   // TooltipManager may be null if there is a problem creating it.
1575   if (widget && widget->GetTooltipManager())
1576     widget->GetTooltipManager()->TooltipTextChanged(this);
1577 }
1578
1579 // Drag and drop ---------------------------------------------------------------
1580
1581 int View::GetDragOperations(const gfx::Point& press_pt) {
1582   return drag_controller_ ?
1583       drag_controller_->GetDragOperationsForView(this, press_pt) :
1584       ui::DragDropTypes::DRAG_NONE;
1585 }
1586
1587 void View::WriteDragData(const gfx::Point& press_pt, OSExchangeData* data) {
1588   DCHECK(drag_controller_);
1589   drag_controller_->WriteDragDataForView(this, press_pt, data);
1590 }
1591
1592 bool View::InDrag() {
1593   Widget* widget = GetWidget();
1594   return widget ? widget->dragged_view() == this : false;
1595 }
1596
1597 int View::GetHorizontalDragThreshold() {
1598   // TODO(jennyz): This value may need to be adjusted for different platforms
1599   // and for different display density.
1600   return kDefaultHorizontalDragThreshold;
1601 }
1602
1603 int View::GetVerticalDragThreshold() {
1604   // TODO(jennyz): This value may need to be adjusted for different platforms
1605   // and for different display density.
1606   return kDefaultVerticalDragThreshold;
1607 }
1608
1609 // Debugging -------------------------------------------------------------------
1610
1611 #if !defined(NDEBUG)
1612
1613 std::string View::PrintViewGraph(bool first) {
1614   return DoPrintViewGraph(first, this);
1615 }
1616
1617 std::string View::DoPrintViewGraph(bool first, View* view_with_children) {
1618   // 64-bit pointer = 16 bytes of hex + "0x" + '\0' = 19.
1619   const size_t kMaxPointerStringLength = 19;
1620
1621   std::string result;
1622
1623   if (first)
1624     result.append("digraph {\n");
1625
1626   // Node characteristics.
1627   char p[kMaxPointerStringLength];
1628
1629   const std::string class_name(GetClassName());
1630   size_t base_name_index = class_name.find_last_of('/');
1631   if (base_name_index == std::string::npos)
1632     base_name_index = 0;
1633   else
1634     base_name_index++;
1635
1636   char bounds_buffer[512];
1637
1638   // Information about current node.
1639   base::snprintf(p, arraysize(bounds_buffer), "%p", view_with_children);
1640   result.append("  N");
1641   result.append(p + 2);
1642   result.append(" [label=\"");
1643
1644   result.append(class_name.substr(base_name_index).c_str());
1645
1646   base::snprintf(bounds_buffer,
1647                  arraysize(bounds_buffer),
1648                  "\\n bounds: (%d, %d), (%dx%d)",
1649                  bounds().x(),
1650                  bounds().y(),
1651                  bounds().width(),
1652                  bounds().height());
1653   result.append(bounds_buffer);
1654
1655   gfx::DecomposedTransform decomp;
1656   if (!GetTransform().IsIdentity() &&
1657       gfx::DecomposeTransform(&decomp, GetTransform())) {
1658     base::snprintf(bounds_buffer,
1659                    arraysize(bounds_buffer),
1660                    "\\n translation: (%f, %f)",
1661                    decomp.translate[0],
1662                    decomp.translate[1]);
1663     result.append(bounds_buffer);
1664
1665     base::snprintf(bounds_buffer,
1666                    arraysize(bounds_buffer),
1667                    "\\n rotation: %3.2f",
1668                    std::acos(decomp.quaternion[3]) * 360.0 / M_PI);
1669     result.append(bounds_buffer);
1670
1671     base::snprintf(bounds_buffer,
1672                    arraysize(bounds_buffer),
1673                    "\\n scale: (%2.4f, %2.4f)",
1674                    decomp.scale[0],
1675                    decomp.scale[1]);
1676     result.append(bounds_buffer);
1677   }
1678
1679   result.append("\"");
1680   if (!parent_)
1681     result.append(", shape=box");
1682   if (layer()) {
1683     if (layer()->has_external_content())
1684       result.append(", color=green");
1685     else
1686       result.append(", color=red");
1687
1688     if (layer()->fills_bounds_opaquely())
1689       result.append(", style=filled");
1690   }
1691   result.append("]\n");
1692
1693   // Link to parent.
1694   if (parent_) {
1695     char pp[kMaxPointerStringLength];
1696
1697     base::snprintf(pp, kMaxPointerStringLength, "%p", parent_);
1698     result.append("  N");
1699     result.append(pp + 2);
1700     result.append(" -> N");
1701     result.append(p + 2);
1702     result.append("\n");
1703   }
1704
1705   // Children.
1706   for (int i = 0, count = view_with_children->child_count(); i < count; ++i)
1707     result.append(view_with_children->child_at(i)->PrintViewGraph(false));
1708
1709   if (first)
1710     result.append("}\n");
1711
1712   return result;
1713 }
1714 #endif
1715
1716 ////////////////////////////////////////////////////////////////////////////////
1717 // View, private:
1718
1719 // DropInfo --------------------------------------------------------------------
1720
1721 void View::DragInfo::Reset() {
1722   possible_drag = false;
1723   start_pt = gfx::Point();
1724 }
1725
1726 void View::DragInfo::PossibleDrag(const gfx::Point& p) {
1727   possible_drag = true;
1728   start_pt = p;
1729 }
1730
1731 // Painting --------------------------------------------------------------------
1732
1733 void View::SchedulePaintBoundsChanged(SchedulePaintType type) {
1734   // If we have a layer and the View's size did not change, we do not need to
1735   // schedule any paints since the layer will be redrawn at its new location
1736   // during the next Draw() cycle in the compositor.
1737   if (!layer() || type == SCHEDULE_PAINT_SIZE_CHANGED) {
1738     // Otherwise, if the size changes or we don't have a layer then we need to
1739     // use SchedulePaint to invalidate the area occupied by the View.
1740     SchedulePaint();
1741   } else if (parent_ && type == SCHEDULE_PAINT_SIZE_SAME) {
1742     // The compositor doesn't Draw() until something on screen changes, so
1743     // if our position changes but nothing is being animated on screen, then
1744     // tell the compositor to redraw the scene. We know layer() exists due to
1745     // the above if clause.
1746     layer()->ScheduleDraw();
1747   }
1748 }
1749
1750 // Tree operations -------------------------------------------------------------
1751
1752 void View::DoRemoveChildView(View* view,
1753                              bool update_focus_cycle,
1754                              bool update_tool_tip,
1755                              bool delete_removed_view,
1756                              View* new_parent) {
1757   DCHECK(view);
1758
1759   const Views::iterator i(std::find(children_.begin(), children_.end(), view));
1760   scoped_ptr<View> view_to_be_deleted;
1761   if (i != children_.end()) {
1762     if (update_focus_cycle) {
1763       // Let's remove the view from the focus traversal.
1764       View* next_focusable = view->next_focusable_view_;
1765       View* prev_focusable = view->previous_focusable_view_;
1766       if (prev_focusable)
1767         prev_focusable->next_focusable_view_ = next_focusable;
1768       if (next_focusable)
1769         next_focusable->previous_focusable_view_ = prev_focusable;
1770     }
1771
1772     if (GetWidget()) {
1773       UnregisterChildrenForVisibleBoundsNotification(view);
1774       if (view->visible())
1775         view->SchedulePaint();
1776       GetWidget()->NotifyWillRemoveView(view);
1777     }
1778
1779     view->PropagateRemoveNotifications(this, new_parent);
1780     view->parent_ = NULL;
1781     view->UpdateLayerVisibility();
1782
1783     if (delete_removed_view && !view->owned_by_client_)
1784       view_to_be_deleted.reset(view);
1785
1786     children_.erase(i);
1787   }
1788
1789   if (update_tool_tip)
1790     UpdateTooltip();
1791
1792   if (layout_manager_.get())
1793     layout_manager_->ViewRemoved(this, view);
1794 }
1795
1796 void View::PropagateRemoveNotifications(View* old_parent, View* new_parent) {
1797   for (int i = 0, count = child_count(); i < count; ++i)
1798     child_at(i)->PropagateRemoveNotifications(old_parent, new_parent);
1799
1800   ViewHierarchyChangedDetails details(false, old_parent, this, new_parent);
1801   for (View* v = this; v; v = v->parent_)
1802     v->ViewHierarchyChangedImpl(true, details);
1803 }
1804
1805 void View::PropagateAddNotifications(
1806     const ViewHierarchyChangedDetails& details) {
1807   for (int i = 0, count = child_count(); i < count; ++i)
1808     child_at(i)->PropagateAddNotifications(details);
1809   ViewHierarchyChangedImpl(true, details);
1810 }
1811
1812 void View::PropagateNativeViewHierarchyChanged() {
1813   for (int i = 0, count = child_count(); i < count; ++i)
1814     child_at(i)->PropagateNativeViewHierarchyChanged();
1815   NativeViewHierarchyChanged();
1816 }
1817
1818 void View::ViewHierarchyChangedImpl(
1819     bool register_accelerators,
1820     const ViewHierarchyChangedDetails& details) {
1821   if (register_accelerators) {
1822     if (details.is_add) {
1823       // If you get this registration, you are part of a subtree that has been
1824       // added to the view hierarchy.
1825       if (GetFocusManager())
1826         RegisterPendingAccelerators();
1827     } else {
1828       if (details.child == this)
1829         UnregisterAccelerators(true);
1830     }
1831   }
1832
1833   if (details.is_add && layer() && !layer()->parent()) {
1834     UpdateParentLayer();
1835     Widget* widget = GetWidget();
1836     if (widget)
1837       widget->UpdateRootLayers();
1838   } else if (!details.is_add && details.child == this) {
1839     // Make sure the layers belonging to the subtree rooted at |child| get
1840     // removed from layers that do not belong in the same subtree.
1841     OrphanLayers();
1842     Widget* widget = GetWidget();
1843     if (widget)
1844       widget->UpdateRootLayers();
1845   }
1846
1847   ViewHierarchyChanged(details);
1848   details.parent->needs_layout_ = true;
1849 }
1850
1851 void View::PropagateNativeThemeChanged(const ui::NativeTheme* theme) {
1852   for (int i = 0, count = child_count(); i < count; ++i)
1853     child_at(i)->PropagateNativeThemeChanged(theme);
1854   OnNativeThemeChanged(theme);
1855 }
1856
1857 // Size and disposition --------------------------------------------------------
1858
1859 void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
1860   for (int i = 0, count = child_count(); i < count; ++i)
1861     child_at(i)->PropagateVisibilityNotifications(start, is_visible);
1862   VisibilityChangedImpl(start, is_visible);
1863 }
1864
1865 void View::VisibilityChangedImpl(View* starting_from, bool is_visible) {
1866   VisibilityChanged(starting_from, is_visible);
1867 }
1868
1869 void View::BoundsChanged(const gfx::Rect& previous_bounds) {
1870   if (visible_) {
1871     // Paint the new bounds.
1872     SchedulePaintBoundsChanged(
1873         bounds_.size() == previous_bounds.size() ? SCHEDULE_PAINT_SIZE_SAME :
1874         SCHEDULE_PAINT_SIZE_CHANGED);
1875   }
1876
1877   if (layer()) {
1878     if (parent_) {
1879       SetLayerBounds(GetLocalBounds() +
1880                      gfx::Vector2d(GetMirroredX(), y()) +
1881                      parent_->CalculateOffsetToAncestorWithLayer(NULL));
1882     } else {
1883       SetLayerBounds(bounds_);
1884     }
1885
1886     // In RTL mode, if our width has changed, our children's mirrored bounds
1887     // will have changed. Update the child's layer bounds, or if it is not a
1888     // layer, the bounds of any layers inside the child.
1889     if (base::i18n::IsRTL() && bounds_.width() != previous_bounds.width()) {
1890       for (int i = 0; i < child_count(); ++i) {
1891         View* child = child_at(i);
1892         child->UpdateChildLayerBounds(
1893             gfx::Vector2d(child->GetMirroredX(), child->y()));
1894       }
1895     }
1896   } else {
1897     // If our bounds have changed, then any descendant layer bounds may have
1898     // changed. Update them accordingly.
1899     UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
1900   }
1901
1902   OnBoundsChanged(previous_bounds);
1903
1904   if (previous_bounds.size() != size()) {
1905     needs_layout_ = false;
1906     Layout();
1907   }
1908
1909   if (GetNeedsNotificationWhenVisibleBoundsChange())
1910     OnVisibleBoundsChanged();
1911
1912   // Notify interested Views that visible bounds within the root view may have
1913   // changed.
1914   if (descendants_to_notify_.get()) {
1915     for (Views::iterator i(descendants_to_notify_->begin());
1916          i != descendants_to_notify_->end(); ++i) {
1917       (*i)->OnVisibleBoundsChanged();
1918     }
1919   }
1920 }
1921
1922 // static
1923 void View::RegisterChildrenForVisibleBoundsNotification(View* view) {
1924   if (view->GetNeedsNotificationWhenVisibleBoundsChange())
1925     view->RegisterForVisibleBoundsNotification();
1926   for (int i = 0; i < view->child_count(); ++i)
1927     RegisterChildrenForVisibleBoundsNotification(view->child_at(i));
1928 }
1929
1930 // static
1931 void View::UnregisterChildrenForVisibleBoundsNotification(View* view) {
1932   if (view->GetNeedsNotificationWhenVisibleBoundsChange())
1933     view->UnregisterForVisibleBoundsNotification();
1934   for (int i = 0; i < view->child_count(); ++i)
1935     UnregisterChildrenForVisibleBoundsNotification(view->child_at(i));
1936 }
1937
1938 void View::RegisterForVisibleBoundsNotification() {
1939   if (registered_for_visible_bounds_notification_)
1940     return;
1941
1942   registered_for_visible_bounds_notification_ = true;
1943   for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
1944     ancestor->AddDescendantToNotify(this);
1945 }
1946
1947 void View::UnregisterForVisibleBoundsNotification() {
1948   if (!registered_for_visible_bounds_notification_)
1949     return;
1950
1951   registered_for_visible_bounds_notification_ = false;
1952   for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
1953     ancestor->RemoveDescendantToNotify(this);
1954 }
1955
1956 void View::AddDescendantToNotify(View* view) {
1957   DCHECK(view);
1958   if (!descendants_to_notify_.get())
1959     descendants_to_notify_.reset(new Views);
1960   descendants_to_notify_->push_back(view);
1961 }
1962
1963 void View::RemoveDescendantToNotify(View* view) {
1964   DCHECK(view && descendants_to_notify_.get());
1965   Views::iterator i(std::find(
1966       descendants_to_notify_->begin(), descendants_to_notify_->end(), view));
1967   DCHECK(i != descendants_to_notify_->end());
1968   descendants_to_notify_->erase(i);
1969   if (descendants_to_notify_->empty())
1970     descendants_to_notify_.reset();
1971 }
1972
1973 void View::SetLayerBounds(const gfx::Rect& bounds) {
1974   layer()->SetBounds(bounds);
1975   SnapLayerToPixelBoundary();
1976 }
1977
1978 // Transformations -------------------------------------------------------------
1979
1980 bool View::GetTransformRelativeTo(const View* ancestor,
1981                                   gfx::Transform* transform) const {
1982   const View* p = this;
1983
1984   while (p && p != ancestor) {
1985     transform->ConcatTransform(p->GetTransform());
1986     gfx::Transform translation;
1987     translation.Translate(static_cast<float>(p->GetMirroredX()),
1988                           static_cast<float>(p->y()));
1989     transform->ConcatTransform(translation);
1990
1991     p = p->parent_;
1992   }
1993
1994   return p == ancestor;
1995 }
1996
1997 // Coordinate conversion -------------------------------------------------------
1998
1999 bool View::ConvertPointForAncestor(const View* ancestor,
2000                                    gfx::Point* point) const {
2001   gfx::Transform trans;
2002   // TODO(sad): Have some way of caching the transformation results.
2003   bool result = GetTransformRelativeTo(ancestor, &trans);
2004   gfx::Point3F p(*point);
2005   trans.TransformPoint(&p);
2006   *point = gfx::ToFlooredPoint(p.AsPointF());
2007   return result;
2008 }
2009
2010 bool View::ConvertPointFromAncestor(const View* ancestor,
2011                                     gfx::Point* point) const {
2012   gfx::Transform trans;
2013   bool result = GetTransformRelativeTo(ancestor, &trans);
2014   gfx::Point3F p(*point);
2015   trans.TransformPointReverse(&p);
2016   *point = gfx::ToFlooredPoint(p.AsPointF());
2017   return result;
2018 }
2019
2020 bool View::ConvertRectForAncestor(const View* ancestor,
2021                                   gfx::RectF* rect) const {
2022   gfx::Transform trans;
2023   // TODO(sad): Have some way of caching the transformation results.
2024   bool result = GetTransformRelativeTo(ancestor, &trans);
2025   trans.TransformRect(rect);
2026   return result;
2027 }
2028
2029 bool View::ConvertRectFromAncestor(const View* ancestor,
2030                                    gfx::RectF* rect) const {
2031   gfx::Transform trans;
2032   bool result = GetTransformRelativeTo(ancestor, &trans);
2033   trans.TransformRectReverse(rect);
2034   return result;
2035 }
2036
2037 // Accelerated painting --------------------------------------------------------
2038
2039 void View::CreateLayer() {
2040   // A new layer is being created for the view. So all the layers of the
2041   // sub-tree can inherit the visibility of the corresponding view.
2042   for (int i = 0, count = child_count(); i < count; ++i)
2043     child_at(i)->UpdateChildLayerVisibility(true);
2044
2045   SetLayer(new ui::Layer());
2046   layer()->set_delegate(this);
2047 #if !defined(NDEBUG)
2048   layer()->set_name(GetClassName());
2049 #endif
2050
2051   UpdateParentLayers();
2052   UpdateLayerVisibility();
2053
2054   // The new layer needs to be ordered in the layer tree according
2055   // to the view tree. Children of this layer were added in order
2056   // in UpdateParentLayers().
2057   if (parent())
2058     parent()->ReorderLayers();
2059
2060   Widget* widget = GetWidget();
2061   if (widget)
2062     widget->UpdateRootLayers();
2063 }
2064
2065 void View::UpdateParentLayers() {
2066   // Attach all top-level un-parented layers.
2067   if (layer() && !layer()->parent()) {
2068     UpdateParentLayer();
2069   } else {
2070     for (int i = 0, count = child_count(); i < count; ++i)
2071       child_at(i)->UpdateParentLayers();
2072   }
2073 }
2074
2075 void View::OrphanLayers() {
2076   if (layer()) {
2077     if (layer()->parent())
2078       layer()->parent()->Remove(layer());
2079
2080     // The layer belonging to this View has already been orphaned. It is not
2081     // necessary to orphan the child layers.
2082     return;
2083   }
2084   for (int i = 0, count = child_count(); i < count; ++i)
2085     child_at(i)->OrphanLayers();
2086 }
2087
2088 void View::ReparentLayer(const gfx::Vector2d& offset, ui::Layer* parent_layer) {
2089   layer()->SetBounds(GetLocalBounds() + offset);
2090   DCHECK_NE(layer(), parent_layer);
2091   if (parent_layer)
2092     parent_layer->Add(layer());
2093   layer()->SchedulePaint(GetLocalBounds());
2094   MoveLayerToParent(layer(), gfx::Point());
2095 }
2096
2097 void View::DestroyLayer() {
2098   ui::Layer* new_parent = layer()->parent();
2099   std::vector<ui::Layer*> children = layer()->children();
2100   for (size_t i = 0; i < children.size(); ++i) {
2101     layer()->Remove(children[i]);
2102     if (new_parent)
2103       new_parent->Add(children[i]);
2104   }
2105
2106   LayerOwner::DestroyLayer();
2107
2108   if (new_parent)
2109     ReorderLayers();
2110
2111   UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
2112
2113   SchedulePaint();
2114
2115   Widget* widget = GetWidget();
2116   if (widget)
2117     widget->UpdateRootLayers();
2118 }
2119
2120 // Input -----------------------------------------------------------------------
2121
2122 bool View::ProcessMousePressed(const ui::MouseEvent& event) {
2123   int drag_operations =
2124       (enabled_ && event.IsOnlyLeftMouseButton() &&
2125        HitTestPoint(event.location())) ?
2126        GetDragOperations(event.location()) : 0;
2127   ContextMenuController* context_menu_controller = event.IsRightMouseButton() ?
2128       context_menu_controller_ : 0;
2129   View::DragInfo* drag_info = GetDragInfo();
2130
2131   // TODO(sky): for debugging 360238.
2132   int storage_id = 0;
2133   if (event.IsOnlyRightMouseButton() && context_menu_controller &&
2134       kContextMenuOnMousePress && HitTestPoint(event.location())) {
2135     ViewStorage* view_storage = ViewStorage::GetInstance();
2136     storage_id = view_storage->CreateStorageID();
2137     view_storage->StoreView(storage_id, this);
2138   }
2139
2140   const bool enabled = enabled_;
2141   const bool result = OnMousePressed(event);
2142
2143   if (!enabled)
2144     return result;
2145
2146   if (event.IsOnlyRightMouseButton() && context_menu_controller &&
2147       kContextMenuOnMousePress) {
2148     // Assume that if there is a context menu controller we won't be deleted
2149     // from mouse pressed.
2150     gfx::Point location(event.location());
2151     if (HitTestPoint(location)) {
2152       if (storage_id != 0)
2153         CHECK_EQ(this, ViewStorage::GetInstance()->RetrieveView(storage_id));
2154       ConvertPointToScreen(this, &location);
2155       ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
2156       return true;
2157     }
2158   }
2159
2160   // WARNING: we may have been deleted, don't use any View variables.
2161   if (drag_operations != ui::DragDropTypes::DRAG_NONE) {
2162     drag_info->PossibleDrag(event.location());
2163     return true;
2164   }
2165   return !!context_menu_controller || result;
2166 }
2167
2168 bool View::ProcessMouseDragged(const ui::MouseEvent& event) {
2169   // Copy the field, that way if we're deleted after drag and drop no harm is
2170   // done.
2171   ContextMenuController* context_menu_controller = context_menu_controller_;
2172   const bool possible_drag = GetDragInfo()->possible_drag;
2173   if (possible_drag &&
2174       ExceededDragThreshold(GetDragInfo()->start_pt - event.location()) &&
2175       (!drag_controller_ ||
2176        drag_controller_->CanStartDragForView(
2177            this, GetDragInfo()->start_pt, event.location()))) {
2178     DoDrag(event, GetDragInfo()->start_pt,
2179            ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
2180   } else {
2181     if (OnMouseDragged(event))
2182       return true;
2183     // Fall through to return value based on context menu controller.
2184   }
2185   // WARNING: we may have been deleted.
2186   return (context_menu_controller != NULL) || possible_drag;
2187 }
2188
2189 void View::ProcessMouseReleased(const ui::MouseEvent& event) {
2190   if (!kContextMenuOnMousePress && context_menu_controller_ &&
2191       event.IsOnlyRightMouseButton()) {
2192     // Assume that if there is a context menu controller we won't be deleted
2193     // from mouse released.
2194     gfx::Point location(event.location());
2195     OnMouseReleased(event);
2196     if (HitTestPoint(location)) {
2197       ConvertPointToScreen(this, &location);
2198       ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
2199     }
2200   } else {
2201     OnMouseReleased(event);
2202   }
2203   // WARNING: we may have been deleted.
2204 }
2205
2206 // Accelerators ----------------------------------------------------------------
2207
2208 void View::RegisterPendingAccelerators() {
2209   if (!accelerators_.get() ||
2210       registered_accelerator_count_ == accelerators_->size()) {
2211     // No accelerators are waiting for registration.
2212     return;
2213   }
2214
2215   if (!GetWidget()) {
2216     // The view is not yet attached to a widget, defer registration until then.
2217     return;
2218   }
2219
2220   accelerator_focus_manager_ = GetFocusManager();
2221   if (!accelerator_focus_manager_) {
2222     // Some crash reports seem to show that we may get cases where we have no
2223     // focus manager (see bug #1291225).  This should never be the case, just
2224     // making sure we don't crash.
2225     NOTREACHED();
2226     return;
2227   }
2228   for (std::vector<ui::Accelerator>::const_iterator i(
2229            accelerators_->begin() + registered_accelerator_count_);
2230        i != accelerators_->end(); ++i) {
2231     accelerator_focus_manager_->RegisterAccelerator(
2232         *i, ui::AcceleratorManager::kNormalPriority, this);
2233   }
2234   registered_accelerator_count_ = accelerators_->size();
2235 }
2236
2237 void View::UnregisterAccelerators(bool leave_data_intact) {
2238   if (!accelerators_.get())
2239     return;
2240
2241   if (GetWidget()) {
2242     if (accelerator_focus_manager_) {
2243       accelerator_focus_manager_->UnregisterAccelerators(this);
2244       accelerator_focus_manager_ = NULL;
2245     }
2246     if (!leave_data_intact) {
2247       accelerators_->clear();
2248       accelerators_.reset();
2249     }
2250     registered_accelerator_count_ = 0;
2251   }
2252 }
2253
2254 // Focus -----------------------------------------------------------------------
2255
2256 void View::InitFocusSiblings(View* v, int index) {
2257   int count = child_count();
2258
2259   if (count == 0) {
2260     v->next_focusable_view_ = NULL;
2261     v->previous_focusable_view_ = NULL;
2262   } else {
2263     if (index == count) {
2264       // We are inserting at the end, but the end of the child list may not be
2265       // the last focusable element. Let's try to find an element with no next
2266       // focusable element to link to.
2267       View* last_focusable_view = NULL;
2268       for (Views::iterator i(children_.begin()); i != children_.end(); ++i) {
2269           if (!(*i)->next_focusable_view_) {
2270             last_focusable_view = *i;
2271             break;
2272           }
2273       }
2274       if (last_focusable_view == NULL) {
2275         // Hum... there is a cycle in the focus list. Let's just insert ourself
2276         // after the last child.
2277         View* prev = children_[index - 1];
2278         v->previous_focusable_view_ = prev;
2279         v->next_focusable_view_ = prev->next_focusable_view_;
2280         prev->next_focusable_view_->previous_focusable_view_ = v;
2281         prev->next_focusable_view_ = v;
2282       } else {
2283         last_focusable_view->next_focusable_view_ = v;
2284         v->next_focusable_view_ = NULL;
2285         v->previous_focusable_view_ = last_focusable_view;
2286       }
2287     } else {
2288       View* prev = children_[index]->GetPreviousFocusableView();
2289       v->previous_focusable_view_ = prev;
2290       v->next_focusable_view_ = children_[index];
2291       if (prev)
2292         prev->next_focusable_view_ = v;
2293       children_[index]->previous_focusable_view_ = v;
2294     }
2295   }
2296 }
2297
2298 void View::AdvanceFocusIfNecessary() {
2299   // Focus should only be advanced if this is the focused view and has become
2300   // unfocusable. If the view is still focusable or is not focused, we can
2301   // return early avoiding furthur unnecessary checks. Focusability check is
2302   // performed first as it tends to be faster.
2303   if (IsAccessibilityFocusable() || !HasFocus())
2304     return;
2305
2306   FocusManager* focus_manager = GetFocusManager();
2307   if (focus_manager)
2308     focus_manager->AdvanceFocusIfNecessary();
2309 }
2310
2311 // System events ---------------------------------------------------------------
2312
2313 void View::PropagateThemeChanged() {
2314   for (int i = child_count() - 1; i >= 0; --i)
2315     child_at(i)->PropagateThemeChanged();
2316   OnThemeChanged();
2317 }
2318
2319 void View::PropagateLocaleChanged() {
2320   for (int i = child_count() - 1; i >= 0; --i)
2321     child_at(i)->PropagateLocaleChanged();
2322   OnLocaleChanged();
2323 }
2324
2325 void View::PropagateDeviceScaleFactorChanged(float device_scale_factor) {
2326   for (int i = child_count() - 1; i >= 0; --i)
2327     child_at(i)->PropagateDeviceScaleFactorChanged(device_scale_factor);
2328
2329   // If the view is drawing to the layer, OnDeviceScaleFactorChanged() is called
2330   // through LayerDelegate callback.
2331   if (!layer())
2332     OnDeviceScaleFactorChanged(device_scale_factor);
2333 }
2334
2335 // Tooltips --------------------------------------------------------------------
2336
2337 void View::UpdateTooltip() {
2338   Widget* widget = GetWidget();
2339   // TODO(beng): The TooltipManager NULL check can be removed when we
2340   //             consolidate Init() methods and make views_unittests Init() all
2341   //             Widgets that it uses.
2342   if (widget && widget->GetTooltipManager())
2343     widget->GetTooltipManager()->UpdateTooltip();
2344 }
2345
2346 // Drag and drop ---------------------------------------------------------------
2347
2348 bool View::DoDrag(const ui::LocatedEvent& event,
2349                   const gfx::Point& press_pt,
2350                   ui::DragDropTypes::DragEventSource source) {
2351   int drag_operations = GetDragOperations(press_pt);
2352   if (drag_operations == ui::DragDropTypes::DRAG_NONE)
2353     return false;
2354
2355   Widget* widget = GetWidget();
2356   // We should only start a drag from an event, implying we have a widget.
2357   DCHECK(widget);
2358
2359   // Don't attempt to start a drag while in the process of dragging. This is
2360   // especially important on X where we can get multiple mouse move events when
2361   // we start the drag.
2362   if (widget->dragged_view())
2363     return false;
2364
2365   OSExchangeData data;
2366   WriteDragData(press_pt, &data);
2367
2368   // Message the RootView to do the drag and drop. That way if we're removed
2369   // the RootView can detect it and avoid calling us back.
2370   gfx::Point widget_location(event.location());
2371   ConvertPointToWidget(this, &widget_location);
2372   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
2373   // WARNING: we may have been deleted.
2374   return true;
2375 }
2376
2377 }  // namespace views