content/browser/web_contents/web_contents_view_mac.mm

   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 #import <Carbon/Carbon.h>
   6
   7 #import "content/browser/web_contents/web_contents_view_mac.h"
   8
   9 #include <string>
  10
  11 #import "base/mac/mac_util.h"
  12 #import "base/mac/scoped_sending_event.h"
  13 #include "base/mac/sdk_forward_declarations.h"
  14 #include "base/message_loop/message_loop.h"
  15 #import "base/message_loop/message_pump_mac.h"
  16 #include "content/browser/frame_host/popup_menu_helper_mac.h"
  17 #include "content/browser/renderer_host/render_view_host_factory.h"
  18 #include "content/browser/renderer_host/render_view_host_impl.h"
  19 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
  20 #include "content/browser/web_contents/web_contents_impl.h"
  21 #import "content/browser/web_contents/web_drag_dest_mac.h"
  22 #import "content/browser/web_contents/web_drag_source_mac.h"
  23 #include "content/common/view_messages.h"
  24 #include "content/public/browser/web_contents_delegate.h"
  25 #include "content/public/browser/web_contents_view_delegate.h"
  26 #include "skia/ext/skia_utils_mac.h"
  27 #import "third_party/mozilla/NSPasteboard+Utils.h"
  28 #include "ui/base/clipboard/custom_data_helper.h"
  29 #import "ui/base/cocoa/focus_tracker.h"
  30 #include "ui/base/dragdrop/cocoa_dnd_util.h"
  31 #include "ui/gfx/image/image_skia_util_mac.h"
  32
  33 using blink::WebDragOperation;
  34 using blink::WebDragOperationsMask;
  35 using content::DropData;
  36 using content::PopupMenuHelper;
  37 using content::RenderViewHostFactory;
  38 using content::RenderWidgetHostView;
  39 using content::RenderWidgetHostViewMac;
  40 using content::WebContents;
  41 using content::WebContentsImpl;
  42 using content::WebContentsViewMac;
  43
  44 // Ensure that the blink::WebDragOperation enum values stay in sync with
  45 // NSDragOperation constants, since the code below static_casts between 'em.
  46 #define COMPILE_ASSERT_MATCHING_ENUM(name) \
  47   COMPILE_ASSERT(int(NS##name) == int(blink::Web##name), enum_mismatch_##name)
  48 COMPILE_ASSERT_MATCHING_ENUM(DragOperationNone);
  49 COMPILE_ASSERT_MATCHING_ENUM(DragOperationCopy);
  50 COMPILE_ASSERT_MATCHING_ENUM(DragOperationLink);
  51 COMPILE_ASSERT_MATCHING_ENUM(DragOperationGeneric);
  52 COMPILE_ASSERT_MATCHING_ENUM(DragOperationPrivate);
  53 COMPILE_ASSERT_MATCHING_ENUM(DragOperationMove);
  54 COMPILE_ASSERT_MATCHING_ENUM(DragOperationDelete);
  55 COMPILE_ASSERT_MATCHING_ENUM(DragOperationEvery);
  56
  57 @interface WebContentsViewCocoa (Private)
  58 - (id)initWithWebContentsViewMac:(WebContentsViewMac*)w;
  59 - (void)registerDragTypes;
  60 - (void)setCurrentDragOperation:(NSDragOperation)operation;
  61 - (DropData*)dropData;
  62 - (void)startDragWithDropData:(const DropData&)dropData
  63             dragOperationMask:(NSDragOperation)operationMask
  64                         image:(NSImage*)image
  65                        offset:(NSPoint)offset;
  66 - (void)cancelDeferredClose;
  67 - (void)clearWebContentsView;
  68 - (void)closeTabAfterEvent;
  69 - (void)viewDidBecomeFirstResponder:(NSNotification*)notification;
  70 @end
  71
  72 namespace content {
  73
  74 WebContentsView* CreateWebContentsView(
  75     WebContentsImpl* web_contents,
  76     WebContentsViewDelegate* delegate,
  77     RenderViewHostDelegateView** render_view_host_delegate_view) {
  78   WebContentsViewMac* rv = new WebContentsViewMac(web_contents, delegate);
  79   *render_view_host_delegate_view = rv;
  80   return rv;
  81 }
  82
  83 WebContentsViewMac::WebContentsViewMac(WebContentsImpl* web_contents,
  84                                        WebContentsViewDelegate* delegate)
  85     : web_contents_(web_contents),
  86       delegate_(delegate),
  87       allow_other_views_(false) {
  88 }
  89
  90 WebContentsViewMac::~WebContentsViewMac() {
  91   // This handles the case where a renderer close call was deferred
  92   // while the user was operating a UI control which resulted in a
  93   // close.  In that case, the Cocoa view outlives the
  94   // WebContentsViewMac instance due to Cocoa retain count.
  95   [cocoa_view_ cancelDeferredClose];
  96   [cocoa_view_ clearWebContentsView];
  97 }
  98
  99 gfx::NativeView WebContentsViewMac::GetNativeView() const {
 100   return cocoa_view_.get();
 101 }
 102
 103 gfx::NativeView WebContentsViewMac::GetContentNativeView() const {
 104   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
 105   if (!rwhv)
 106     return NULL;
 107   return rwhv->GetNativeView();
 108 }
 109
 110 gfx::NativeWindow WebContentsViewMac::GetTopLevelNativeWindow() const {
 111   return [cocoa_view_.get() window];
 112 }
 113
 114 void WebContentsViewMac::GetContainerBounds(gfx::Rect* out) const {
 115   // Convert bounds to window coordinate space.
 116   NSRect bounds =
 117       [cocoa_view_.get() convertRect:[cocoa_view_.get() bounds] toView:nil];
 118
 119   // Convert bounds to screen coordinate space.
 120   NSWindow* window = [cocoa_view_.get() window];
 121   bounds.origin = [window convertBaseToScreen:bounds.origin];
 122
 123   // Flip y to account for screen flip.
 124   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
 125   bounds.origin.y = [screen frame].size.height - bounds.origin.y
 126       - bounds.size.height;
 127   *out = gfx::Rect(NSRectToCGRect(bounds));
 128 }
 129
 130 void WebContentsViewMac::StartDragging(
 131     const DropData& drop_data,
 132     WebDragOperationsMask allowed_operations,
 133     const gfx::ImageSkia& image,
 134     const gfx::Vector2d& image_offset,
 135     const DragEventSourceInfo& event_info) {
 136   // By allowing nested tasks, the code below also allows Close(),
 137   // which would deallocate |this|.  The same problem can occur while
 138   // processing -sendEvent:, so Close() is deferred in that case.
 139   // Drags from web content do not come via -sendEvent:, this sets the
 140   // same flag -sendEvent: would.
 141   base::mac::ScopedSendingEvent sending_event_scoper;
 142
 143   // The drag invokes a nested event loop, arrange to continue
 144   // processing events.
 145   base::MessageLoop::ScopedNestableTaskAllower allow(
 146       base::MessageLoop::current());
 147   NSDragOperation mask = static_cast<NSDragOperation>(allowed_operations);
 148   NSPoint offset = NSPointFromCGPoint(
 149       gfx::PointAtOffsetFromOrigin(image_offset).ToCGPoint());
 150   [cocoa_view_ startDragWithDropData:drop_data
 151                    dragOperationMask:mask
 152                                image:gfx::NSImageFromImageSkia(image)
 153                               offset:offset];
 154 }
 155
 156 void WebContentsViewMac::SizeContents(const gfx::Size& size) {
 157   // TODO(brettw | japhet) This is a hack and should be removed.
 158   // See web_contents_view.h.
 159   // Note(erikchen): This method has /never/ worked correctly. I've removed the
 160   // previous implementation.
 161 }
 162
 163 gfx::NativeView WebContentsViewMac::GetNativeViewForFocus() const {
 164   RenderWidgetHostView* rwhv =
 165       web_contents_->GetFullscreenRenderWidgetHostView();
 166   if (!rwhv)
 167     rwhv = web_contents_->GetRenderWidgetHostView();
 168   return rwhv ? rwhv->GetNativeView() : nil;
 169 }
 170
 171 void WebContentsViewMac::Focus() {
 172   gfx::NativeView native_view = GetNativeViewForFocus();
 173   NSWindow* window = [native_view window];
 174   [window makeFirstResponder:native_view];
 175   if (![window isVisible])
 176     return;
 177   [window makeKeyAndOrderFront:nil];
 178 }
 179
 180 void WebContentsViewMac::SetInitialFocus() {
 181   if (web_contents_->FocusLocationBarByDefault())
 182     web_contents_->SetFocusToLocationBar(false);
 183   else
 184     Focus();
 185 }
 186
 187 void WebContentsViewMac::StoreFocus() {
 188   gfx::NativeView native_view = GetNativeViewForFocus();
 189   // We're explicitly being asked to store focus, so don't worry if there's
 190   // already a view saved.
 191   focus_tracker_.reset(
 192       [[FocusTracker alloc] initWithWindow:[native_view window]]);
 193 }
 194
 195 void WebContentsViewMac::RestoreFocus() {
 196   gfx::NativeView native_view = GetNativeViewForFocus();
 197   // TODO(avi): Could we be restoring a view that's no longer in the key view
 198   // chain?
 199   if (!(focus_tracker_.get() &&
 200         [focus_tracker_ restoreFocusInWindow:[native_view window]])) {
 201     // Fall back to the default focus behavior if we could not restore focus.
 202     // TODO(shess): If location-bar gets focus by default, this will
 203     // select-all in the field.  If there was a specific selection in
 204     // the field when we navigated away from it, we should restore
 205     // that selection.
 206     SetInitialFocus();
 207   }
 208
 209   focus_tracker_.reset(nil);
 210 }
 211
 212 DropData* WebContentsViewMac::GetDropData() const {
 213   return [cocoa_view_ dropData];
 214 }
 215
 216 void WebContentsViewMac::UpdateDragCursor(WebDragOperation operation) {
 217   [cocoa_view_ setCurrentDragOperation: operation];
 218 }
 219
 220 void WebContentsViewMac::GotFocus() {
 221   // This is only used in the views FocusManager stuff but it bleeds through
 222   // all subclasses. http://crbug.com/21875
 223 }
 224
 225 // This is called when the renderer asks us to take focus back (i.e., it has
 226 // iterated past the last focusable element on the page).
 227 void WebContentsViewMac::TakeFocus(bool reverse) {
 228   if (reverse) {
 229     [[cocoa_view_ window] selectPreviousKeyView:cocoa_view_.get()];
 230   } else {
 231     [[cocoa_view_ window] selectNextKeyView:cocoa_view_.get()];
 232   }
 233 }
 234
 235 void WebContentsViewMac::ShowContextMenu(
 236     RenderFrameHost* render_frame_host,
 237     const ContextMenuParams& params) {
 238   // Allow delegates to handle the context menu operation first.
 239   if (web_contents_->GetDelegate() &&
 240       web_contents_->GetDelegate()->HandleContextMenu(params)) {
 241     return;
 242   }
 243
 244   if (delegate())
 245     delegate()->ShowContextMenu(render_frame_host, params);
 246   else
 247     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 248 }
 249
 250 void WebContentsViewMac::ShowPopupMenu(
 251     RenderFrameHost* render_frame_host,
 252     const gfx::Rect& bounds,
 253     int item_height,
 254     double item_font_size,
 255     int selected_item,
 256     const std::vector<MenuItem>& items,
 257     bool right_aligned,
 258     bool allow_multiple_selection) {
 259   popup_menu_helper_.reset(new PopupMenuHelper(render_frame_host));
 260   popup_menu_helper_->ShowPopupMenu(bounds, item_height, item_font_size,
 261                                     selected_item, items, right_aligned,
 262                                     allow_multiple_selection);
 263   popup_menu_helper_.reset();
 264 }
 265
 266 void WebContentsViewMac::HidePopupMenu() {
 267   if (popup_menu_helper_)
 268     popup_menu_helper_->Hide();
 269 }
 270
 271 gfx::Rect WebContentsViewMac::GetViewBounds() const {
 272   // This method is not currently used on mac.
 273   NOTIMPLEMENTED();
 274   return gfx::Rect();
 275 }
 276
 277 void WebContentsViewMac::SetAllowOtherViews(bool allow) {
 278   if (allow_other_views_ == allow)
 279     return;
 280
 281   allow_other_views_ = allow;
 282   RenderWidgetHostViewMac* view = static_cast<RenderWidgetHostViewMac*>(
 283       web_contents_->GetRenderWidgetHostView());
 284   if (view)
 285     view->SetAllowPauseForResizeOrRepaint(!allow_other_views_);
 286 }
 287
 288 bool WebContentsViewMac::GetAllowOtherViews() const {
 289   return allow_other_views_;
 290 }
 291
 292 void WebContentsViewMac::CreateView(
 293     const gfx::Size& initial_size, gfx::NativeView context) {
 294   WebContentsViewCocoa* view =
 295       [[WebContentsViewCocoa alloc] initWithWebContentsViewMac:this];
 296   cocoa_view_.reset(view);
 297 }
 298
 299 RenderWidgetHostViewBase* WebContentsViewMac::CreateViewForWidget(
 300     RenderWidgetHost* render_widget_host, bool is_guest_view_hack) {
 301   if (render_widget_host->GetView()) {
 302     // During testing, the view will already be set up in most cases to the
 303     // test view, so we don't want to clobber it with a real one. To verify that
 304     // this actually is happening (and somebody isn't accidentally creating the
 305     // view twice), we check for the RVH Factory, which will be set when we're
 306     // making special ones (which go along with the special views).
 307     DCHECK(RenderViewHostFactory::has_factory());
 308     return static_cast<RenderWidgetHostViewBase*>(
 309         render_widget_host->GetView());
 310   }
 311
 312   RenderWidgetHostViewMac* view = new RenderWidgetHostViewMac(
 313       render_widget_host, is_guest_view_hack);
 314   if (delegate()) {
 315     base::scoped_nsobject<NSObject<RenderWidgetHostViewMacDelegate> >
 316         rw_delegate(
 317             delegate()->CreateRenderWidgetHostViewDelegate(render_widget_host));
 318
 319     view->SetDelegate(rw_delegate.get());
 320   }
 321   view->SetAllowPauseForResizeOrRepaint(!allow_other_views_);
 322
 323   // Fancy layout comes later; for now just make it our size and resize it
 324   // with us. In case there are other siblings of the content area, we want
 325   // to make sure the content area is on the bottom so other things draw over
 326   // it.
 327   NSView* view_view = view->GetNativeView();
 328   [view_view setFrame:[cocoa_view_.get() bounds]];
 329   [view_view setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
 330   // Add the new view below all other views; this also keeps it below any
 331   // overlay view installed.
 332   [cocoa_view_.get() addSubview:view_view
 333                      positioned:NSWindowBelow
 334                      relativeTo:nil];
 335   // For some reason known only to Cocoa, the autorecalculation of the key view
 336   // loop set on the window doesn't set the next key view when the subview is
 337   // added. On 10.6 things magically work fine; on 10.5 they fail
 338   // <http://crbug.com/61493>. Digging into Cocoa key view loop code yielded
 339   // madness; TODO(avi,rohit): look at this again and figure out what's really
 340   // going on.
 341   [cocoa_view_.get() setNextKeyView:view_view];
 342   return view;
 343 }
 344
 345 RenderWidgetHostViewBase* WebContentsViewMac::CreateViewForPopupWidget(
 346     RenderWidgetHost* render_widget_host) {
 347   return new RenderWidgetHostViewMac(render_widget_host, false);
 348 }
 349
 350 void WebContentsViewMac::SetPageTitle(const base::string16& title) {
 351   // Meaningless on the Mac; widgets don't have a "title" attribute
 352 }
 353
 354
 355 void WebContentsViewMac::RenderViewCreated(RenderViewHost* host) {
 356   // We want updates whenever the intrinsic width of the webpage changes.
 357   // Put the RenderView into that mode. The preferred width is used for example
 358   // when the "zoom" button in the browser window is clicked.
 359   host->EnablePreferredSizeMode();
 360 }
 361
 362 void WebContentsViewMac::RenderViewSwappedIn(RenderViewHost* host) {
 363 }
 364
 365 void WebContentsViewMac::SetOverscrollControllerEnabled(bool enabled) {
 366 }
 367
 368 bool WebContentsViewMac::IsEventTracking() const {
 369   return base::MessagePumpMac::IsHandlingSendEvent();
 370 }
 371
 372 // Arrange to call CloseTab() after we're back to the main event loop.
 373 // The obvious way to do this would be PostNonNestableTask(), but that
 374 // will fire when the event-tracking loop polls for events.  So we
 375 // need to bounce the message via Cocoa, instead.
 376 void WebContentsViewMac::CloseTabAfterEventTracking() {
 377   [cocoa_view_ cancelDeferredClose];
 378   [cocoa_view_ performSelector:@selector(closeTabAfterEvent)
 379                     withObject:nil
 380                     afterDelay:0.0];
 381 }
 382
 383 void WebContentsViewMac::CloseTab() {
 384   web_contents_->Close(web_contents_->GetRenderViewHost());
 385 }
 386
 387 }  // namespace content
 388
 389 @implementation WebContentsViewCocoa
 390
 391 - (id)initWithWebContentsViewMac:(WebContentsViewMac*)w {
 392   self = [super initWithFrame:NSZeroRect];
 393   if (self != nil) {
 394     webContentsView_ = w;
 395     dragDest_.reset(
 396         [[WebDragDest alloc] initWithWebContentsImpl:[self webContents]]);
 397     [self registerDragTypes];
 398
 399     [[NSNotificationCenter defaultCenter]
 400          addObserver:self
 401             selector:@selector(viewDidBecomeFirstResponder:)
 402                 name:kViewDidBecomeFirstResponder
 403               object:nil];
 404
 405     if (webContentsView_->delegate()) {
 406       [dragDest_ setDragDelegate:webContentsView_->delegate()->
 407           GetDragDestDelegate()];
 408     }
 409   }
 410   return self;
 411 }
 412
 413 - (void)dealloc {
 414   // Cancel any deferred tab closes, just in case.
 415   [self cancelDeferredClose];
 416
 417   // This probably isn't strictly necessary, but can't hurt.
 418   [self unregisterDraggedTypes];
 419
 420   [[NSNotificationCenter defaultCenter] removeObserver:self];
 421
 422   [super dealloc];
 423 }
 424
 425 // Registers for the view for the appropriate drag types.
 426 - (void)registerDragTypes {
 427   NSArray* types = [NSArray arrayWithObjects:
 428       ui::kChromeDragDummyPboardType,
 429       kWebURLsWithTitlesPboardType,
 430       NSURLPboardType,
 431       NSStringPboardType,
 432       NSHTMLPboardType,
 433       NSRTFPboardType,
 434       NSFilenamesPboardType,
 435       ui::kWebCustomDataPboardType,
 436       nil];
 437   [self registerForDraggedTypes:types];
 438 }
 439
 440 - (void)setCurrentDragOperation:(NSDragOperation)operation {
 441   [dragDest_ setCurrentOperation:operation];
 442 }
 443
 444 - (DropData*)dropData {
 445   return [dragDest_ currentDropData];
 446 }
 447
 448 - (WebContentsImpl*)webContents {
 449   if (webContentsView_ == NULL)
 450     return NULL;
 451   return webContentsView_->web_contents();
 452 }
 453
 454 - (void)mouseEvent:(NSEvent*)theEvent {
 455   WebContentsImpl* webContents = [self webContents];
 456   if (webContents && webContents->GetDelegate()) {
 457     NSPoint location = [NSEvent mouseLocation];
 458     if ([theEvent type] == NSMouseMoved)
 459       webContents->GetDelegate()->ContentsMouseEvent(
 460           webContents, gfx::Point(location.x, location.y), true);
 461     if ([theEvent type] == NSMouseExited)
 462       webContents->GetDelegate()->ContentsMouseEvent(
 463           webContents, gfx::Point(location.x, location.y), false);
 464   }
 465 }
 466
 467 - (void)setMouseDownCanMoveWindow:(BOOL)canMove {
 468   mouseDownCanMoveWindow_ = canMove;
 469 }
 470
 471 - (BOOL)mouseDownCanMoveWindow {
 472   // This is needed to prevent mouseDowns from moving the window
 473   // around.  The default implementation returns YES only for opaque
 474   // views.  WebContentsViewCocoa does not draw itself in any way, but
 475   // its subviews do paint their entire frames.  Returning NO here
 476   // saves us the effort of overriding this method in every possible
 477   // subview.
 478   return mouseDownCanMoveWindow_;
 479 }
 480
 481 - (void)pasteboard:(NSPasteboard*)sender provideDataForType:(NSString*)type {
 482   [dragSource_ lazyWriteToPasteboard:sender
 483                              forType:type];
 484 }
 485
 486 - (void)startDragWithDropData:(const DropData&)dropData
 487             dragOperationMask:(NSDragOperation)operationMask
 488                         image:(NSImage*)image
 489                        offset:(NSPoint)offset {
 490   dragSource_.reset([[WebDragSource alloc]
 491       initWithContents:[self webContents]
 492                   view:self
 493               dropData:&dropData
 494                  image:image
 495                 offset:offset
 496             pasteboard:[NSPasteboard pasteboardWithName:NSDragPboard]
 497      dragOperationMask:operationMask]);
 498   [dragSource_ startDrag];
 499 }
 500
 501 // NSDraggingSource methods
 502
 503 // Returns what kind of drag operations are available. This is a required
 504 // method for NSDraggingSource.
 505 - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
 506   if (dragSource_)
 507     return [dragSource_ draggingSourceOperationMaskForLocal:isLocal];
 508   // No web drag source - this is the case for dragging a file from the
 509   // downloads manager. Default to copy operation. Note: It is desirable to
 510   // allow the user to either move or copy, but this requires additional
 511   // plumbing to update the download item's path once its moved.
 512   return NSDragOperationCopy;
 513 }
 514
 515 // Called when a drag initiated in our view ends.
 516 - (void)draggedImage:(NSImage*)anImage
 517              endedAt:(NSPoint)screenPoint
 518            operation:(NSDragOperation)operation {
 519   [dragSource_ endDragAt:screenPoint operation:operation];
 520
 521   // Might as well throw out this object now.
 522   dragSource_.reset();
 523 }
 524
 525 // Called when a drag initiated in our view moves.
 526 - (void)draggedImage:(NSImage*)draggedImage movedTo:(NSPoint)screenPoint {
 527 }
 528
 529 // Called when a file drag is dropped and the promised files need to be written.
 530 - (NSArray*)namesOfPromisedFilesDroppedAtDestination:(NSURL*)dropDest {
 531   if (![dropDest isFileURL])
 532     return nil;
 533
 534   NSString* fileName = [dragSource_ dragPromisedFileTo:[dropDest path]];
 535   if (!fileName)
 536     return nil;
 537
 538   return @[ fileName ];
 539 }
 540
 541 // NSDraggingDestination methods
 542
 543 - (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
 544   return [dragDest_ draggingEntered:sender view:self];
 545 }
 546
 547 - (void)draggingExited:(id<NSDraggingInfo>)sender {
 548   [dragDest_ draggingExited:sender];
 549 }
 550
 551 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
 552   return [dragDest_ draggingUpdated:sender view:self];
 553 }
 554
 555 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
 556   return [dragDest_ performDragOperation:sender view:self];
 557 }
 558
 559 - (void)cancelDeferredClose {
 560   SEL aSel = @selector(closeTabAfterEvent);
 561   [NSObject cancelPreviousPerformRequestsWithTarget:self
 562                                            selector:aSel
 563                                              object:nil];
 564 }
 565
 566 - (void)clearWebContentsView {
 567   webContentsView_ = NULL;
 568   [dragSource_ clearWebContentsView];
 569 }
 570
 571 - (void)closeTabAfterEvent {
 572   webContentsView_->CloseTab();
 573 }
 574
 575 - (void)viewDidBecomeFirstResponder:(NSNotification*)notification {
 576   NSView* view = [notification object];
 577   if (![[self subviews] containsObject:view])
 578     return;
 579
 580   NSSelectionDirection direction =
 581       [[[notification userInfo] objectForKey:kSelectionDirection]
 582         unsignedIntegerValue];
 583   if (direction == NSDirectSelection)
 584     return;
 585
 586   [self webContents]->
 587       FocusThroughTabTraversal(direction == NSSelectingPrevious);
 588 }
 589
 590 // When the subviews require a layout, their size should be reset to the size
 591 // of this view. (It is possible for the size to get out of sync as an
 592 // optimization in preparation for an upcoming WebContentsView resize.
 593 // http://crbug.com/264207)
 594 - (void)resizeSubviewsWithOldSize:(NSSize)oldBoundsSize {
 595   for (NSView* subview in self.subviews)
 596     [subview setFrame:self.bounds];
 597 }
 598
 599 - (void)viewWillMoveToWindow:(NSWindow*)newWindow {
 600   NSWindow* oldWindow = [self window];
 601
 602   NSNotificationCenter* notificationCenter =
 603       [NSNotificationCenter defaultCenter];
 604
 605   // Occlusion notification APIs are new in Mavericks.
 606   bool supportsOcclusionAPIs = base::mac::IsOSMavericksOrLater();
 607
 608   if (supportsOcclusionAPIs) {
 609     if (oldWindow) {
 610       [notificationCenter
 611           removeObserver:self
 612                     name:NSWindowDidChangeOcclusionStateNotification
 613                   object:oldWindow];
 614     }
 615     if (newWindow) {
 616       [notificationCenter
 617           addObserver:self
 618              selector:@selector(windowChangedOcclusionState:)
 619                  name:NSWindowDidChangeOcclusionStateNotification
 620                object:newWindow];
 621     }
 622   }
 623 }
 624
 625 - (void)windowChangedOcclusionState:(NSNotification*)notification {
 626   DCHECK(base::mac::IsOSMavericksOrLater());
 627   NSWindow* window = [notification object];
 628   WebContentsImpl* webContents = [self webContents];
 629   if (window && webContents) {
 630     if ([window occlusionState] & NSWindowOcclusionStateVisible) {
 631       if (!webContents->should_normally_be_visible())
 632         webContents->WasShown();
 633     } else {
 634       if (webContents->should_normally_be_visible())
 635         webContents->WasHidden();
 636     }
 637   }
 638 }
 639
 640 @end