content/browser/web_contents/web_contents_view_aura.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 #include "content/browser/web_contents/web_contents_view_aura.h"
   6
   7 #include "base/auto_reset.h"
   8 #include "base/command_line.h"
   9 #include "base/file_util.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "content/browser/browser_plugin/browser_plugin_guest.h"
  13 #include "content/browser/download/drag_download_util.h"
  14 #include "content/browser/frame_host/interstitial_page_impl.h"
  15 #include "content/browser/frame_host/navigation_entry_impl.h"
  16 #include "content/browser/renderer_host/dip_util.h"
  17 #include "content/browser/renderer_host/overscroll_controller.h"
  18 #include "content/browser/renderer_host/render_view_host_factory.h"
  19 #include "content/browser/renderer_host/render_view_host_impl.h"
  20 #include "content/browser/renderer_host/render_widget_host_impl.h"
  21 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
  22 #include "content/browser/web_contents/aura/gesture_nav_simple.h"
  23 #include "content/browser/web_contents/aura/image_window_delegate.h"
  24 #include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
  25 #include "content/browser/web_contents/aura/shadow_layer_delegate.h"
  26 #include "content/browser/web_contents/aura/window_slider.h"
  27 #include "content/browser/web_contents/touch_editable_impl_aura.h"
  28 #include "content/browser/web_contents/web_contents_impl.h"
  29 #include "content/public/browser/content_browser_client.h"
  30 #include "content/public/browser/notification_observer.h"
  31 #include "content/public/browser/notification_registrar.h"
  32 #include "content/public/browser/notification_source.h"
  33 #include "content/public/browser/notification_types.h"
  34 #include "content/public/browser/overscroll_configuration.h"
  35 #include "content/public/browser/render_view_host.h"
  36 #include "content/public/browser/render_widget_host.h"
  37 #include "content/public/browser/render_widget_host_view.h"
  38 #include "content/public/browser/web_contents_delegate.h"
  39 #include "content/public/browser/web_contents_observer.h"
  40 #include "content/public/browser/web_contents_view_delegate.h"
  41 #include "content/public/browser/web_drag_dest_delegate.h"
  42 #include "content/public/common/content_client.h"
  43 #include "content/public/common/content_switches.h"
  44 #include "content/public/common/drop_data.h"
  45 #include "net/base/filename_util.h"
  46 #include "third_party/WebKit/public/web/WebInputEvent.h"
  47 #include "ui/aura/client/aura_constants.h"
  48 #include "ui/aura/client/window_tree_client.h"
  49 #include "ui/aura/env.h"
  50 #include "ui/aura/window.h"
  51 #include "ui/aura/window_observer.h"
  52 #include "ui/aura/window_tree_host.h"
  53 #include "ui/aura/window_tree_host_observer.h"
  54 #include "ui/base/clipboard/clipboard.h"
  55 #include "ui/base/clipboard/custom_data_helper.h"
  56 #include "ui/base/dragdrop/drag_drop_types.h"
  57 #include "ui/base/dragdrop/drag_utils.h"
  58 #include "ui/base/dragdrop/drop_target_event.h"
  59 #include "ui/base/dragdrop/os_exchange_data.h"
  60 #include "ui/base/hit_test.h"
  61 #include "ui/compositor/layer.h"
  62 #include "ui/compositor/scoped_layer_animation_settings.h"
  63 #include "ui/events/event.h"
  64 #include "ui/events/event_utils.h"
  65 #include "ui/gfx/canvas.h"
  66 #include "ui/gfx/image/image.h"
  67 #include "ui/gfx/image/image_png_rep.h"
  68 #include "ui/gfx/image/image_skia.h"
  69 #include "ui/gfx/screen.h"
  70 #include "ui/wm/public/drag_drop_client.h"
  71 #include "ui/wm/public/drag_drop_delegate.h"
  72
  73 namespace content {
  74 WebContentsView* CreateWebContentsView(
  75     WebContentsImpl* web_contents,
  76     WebContentsViewDelegate* delegate,
  77     RenderViewHostDelegateView** render_view_host_delegate_view) {
  78   WebContentsViewAura* rv = new WebContentsViewAura(web_contents, delegate);
  79   *render_view_host_delegate_view = rv;
  80   return rv;
  81 }
  82
  83 namespace {
  84
  85 bool IsScrollEndEffectEnabled() {
  86   return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
  87       switches::kScrollEndEffect) == "1";
  88 }
  89
  90 bool ShouldNavigateForward(const NavigationController& controller,
  91                            OverscrollMode mode) {
  92   return mode == (base::i18n::IsRTL() ? OVERSCROLL_EAST : OVERSCROLL_WEST) &&
  93          controller.CanGoForward();
  94 }
  95
  96 bool ShouldNavigateBack(const NavigationController& controller,
  97                         OverscrollMode mode) {
  98   return mode == (base::i18n::IsRTL() ? OVERSCROLL_WEST : OVERSCROLL_EAST) &&
  99          controller.CanGoBack();
 100 }
 101
 102 RenderWidgetHostViewAura* ToRenderWidgetHostViewAura(
 103     RenderWidgetHostView* view) {
 104   if (!view || RenderViewHostFactory::has_factory())
 105     return NULL;  // Can't cast to RenderWidgetHostViewAura in unit tests.
 106
 107   RenderViewHost* rvh = RenderViewHost::From(view->GetRenderWidgetHost());
 108   WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
 109       rvh ? WebContents::FromRenderViewHost(rvh) : NULL);
 110   if (BrowserPluginGuest::IsGuest(web_contents))
 111     return NULL;
 112   return static_cast<RenderWidgetHostViewAura*>(view);
 113 }
 114
 115 // The window delegate for the overscroll window. This redirects trackpad events
 116 // to the web-contents window. The delegate destroys itself when the window is
 117 // destroyed.
 118 class OverscrollWindowDelegate : public ImageWindowDelegate {
 119  public:
 120   OverscrollWindowDelegate(WebContentsImpl* web_contents,
 121                            OverscrollMode overscroll_mode)
 122       : web_contents_(web_contents),
 123         forward_events_(true) {
 124     const NavigationControllerImpl& controller = web_contents->GetController();
 125     const NavigationEntryImpl* entry = NULL;
 126     if (ShouldNavigateForward(controller, overscroll_mode)) {
 127       entry = NavigationEntryImpl::FromNavigationEntry(
 128           controller.GetEntryAtOffset(1));
 129     } else if (ShouldNavigateBack(controller, overscroll_mode)) {
 130       entry = NavigationEntryImpl::FromNavigationEntry(
 131           controller.GetEntryAtOffset(-1));
 132     }
 133
 134     gfx::Image image;
 135     if (entry && entry->screenshot().get()) {
 136       std::vector<gfx::ImagePNGRep> image_reps;
 137       image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(),
 138           ui::GetScaleFactorForNativeView(web_contents_window())));
 139       image = gfx::Image(image_reps);
 140     }
 141     SetImage(image);
 142   }
 143
 144   void stop_forwarding_events() { forward_events_ = false; }
 145
 146  private:
 147   virtual ~OverscrollWindowDelegate() {}
 148
 149   aura::Window* web_contents_window() {
 150     return web_contents_->GetView()->GetContentNativeView();
 151   }
 152
 153   // Overridden from ui::EventHandler.
 154   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE {
 155     if (forward_events_ && web_contents_window())
 156       web_contents_window()->delegate()->OnScrollEvent(event);
 157   }
 158
 159   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
 160     if (forward_events_ && web_contents_window())
 161       web_contents_window()->delegate()->OnGestureEvent(event);
 162   }
 163
 164   WebContentsImpl* web_contents_;
 165
 166   // The window is displayed both during the gesture, and after the gesture
 167   // while the navigation is in progress. During the gesture, it is necessary to
 168   // forward input events to the content page (e.g. when the overscroll window
 169   // slides under the cursor and starts receiving scroll events). However, once
 170   // the gesture is complete, and the window is being displayed as an overlay
 171   // window during navigation, events should not be forwarded anymore.
 172   bool forward_events_;
 173
 174   DISALLOW_COPY_AND_ASSIGN(OverscrollWindowDelegate);
 175 };
 176
 177 // Listens to all mouse drag events during a drag and drop and sends them to
 178 // the renderer.
 179 class WebDragSourceAura : public NotificationObserver {
 180  public:
 181   WebDragSourceAura(aura::Window* window, WebContentsImpl* contents)
 182       : window_(window),
 183         contents_(contents) {
 184     registrar_.Add(this,
 185                    NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
 186                    Source<WebContents>(contents));
 187   }
 188
 189   virtual ~WebDragSourceAura() {
 190   }
 191
 192   // NotificationObserver:
 193   virtual void Observe(int type,
 194       const NotificationSource& source,
 195       const NotificationDetails& details) OVERRIDE {
 196     if (type != NOTIFICATION_WEB_CONTENTS_DISCONNECTED)
 197       return;
 198
 199     // Cancel the drag if it is still in progress.
 200     aura::client::DragDropClient* dnd_client =
 201         aura::client::GetDragDropClient(window_->GetRootWindow());
 202     if (dnd_client && dnd_client->IsDragDropInProgress())
 203       dnd_client->DragCancel();
 204
 205     window_ = NULL;
 206     contents_ = NULL;
 207   }
 208
 209   aura::Window* window() const { return window_; }
 210
 211  private:
 212   aura::Window* window_;
 213   WebContentsImpl* contents_;
 214   NotificationRegistrar registrar_;
 215
 216   DISALLOW_COPY_AND_ASSIGN(WebDragSourceAura);
 217 };
 218
 219 #if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
 220 // Fill out the OSExchangeData with a file contents, synthesizing a name if
 221 // necessary.
 222 void PrepareDragForFileContents(const DropData& drop_data,
 223                                 ui::OSExchangeData::Provider* provider) {
 224   base::FilePath file_name =
 225       base::FilePath::FromUTF16Unsafe(drop_data.file_description_filename);
 226   // Images without ALT text will only have a file extension so we need to
 227   // synthesize one from the provided extension and URL.
 228   if (file_name.BaseName().RemoveExtension().empty()) {
 229     const base::FilePath::StringType extension = file_name.Extension();
 230     // Retrieve the name from the URL.
 231     file_name = net::GenerateFileName(drop_data.url, "", "", "", "", "")
 232                     .ReplaceExtension(extension);
 233   }
 234   provider->SetFileContents(file_name, drop_data.file_contents);
 235 }
 236 #endif
 237
 238 #if defined(OS_WIN)
 239 void PrepareDragForDownload(
 240     const DropData& drop_data,
 241     ui::OSExchangeData::Provider* provider,
 242     WebContentsImpl* web_contents) {
 243   const GURL& page_url = web_contents->GetLastCommittedURL();
 244   const std::string& page_encoding = web_contents->GetEncoding();
 245
 246   // Parse the download metadata.
 247   base::string16 mime_type;
 248   base::FilePath file_name;
 249   GURL download_url;
 250   if (!ParseDownloadMetadata(drop_data.download_metadata,
 251                              &mime_type,
 252                              &file_name,
 253                              &download_url))
 254     return;
 255
 256   // Generate the file name based on both mime type and proposed file name.
 257   std::string default_name =
 258       GetContentClient()->browser()->GetDefaultDownloadName();
 259   base::FilePath generated_download_file_name =
 260       net::GenerateFileName(download_url,
 261                             std::string(),
 262                             std::string(),
 263                             base::UTF16ToUTF8(file_name.value()),
 264                             base::UTF16ToUTF8(mime_type),
 265                             default_name);
 266
 267   // http://crbug.com/332579
 268   base::ThreadRestrictions::ScopedAllowIO allow_file_operations;
 269
 270   base::FilePath temp_dir_path;
 271   if (!base::CreateNewTempDirectory(FILE_PATH_LITERAL("chrome_drag"),
 272                                     &temp_dir_path))
 273     return;
 274
 275   base::FilePath download_path =
 276       temp_dir_path.Append(generated_download_file_name);
 277
 278   // We cannot know when the target application will be done using the temporary
 279   // file, so schedule it to be deleted after rebooting.
 280   base::DeleteFileAfterReboot(download_path);
 281   base::DeleteFileAfterReboot(temp_dir_path);
 282
 283   // Provide the data as file (CF_HDROP). A temporary download file with the
 284   // Zone.Identifier ADS (Alternate Data Stream) attached will be created.
 285   scoped_refptr<DragDownloadFile> download_file =
 286       new DragDownloadFile(
 287           download_path,
 288           base::File(),
 289           download_url,
 290           Referrer(page_url, drop_data.referrer_policy),
 291           page_encoding,
 292           web_contents);
 293   ui::OSExchangeData::DownloadFileInfo file_download(base::FilePath(),
 294                                                      download_file.get());
 295   provider->SetDownloadFileInfo(file_download);
 296 }
 297 #endif  // defined(OS_WIN)
 298
 299 // Returns the CustomFormat to store file system files.
 300 const ui::OSExchangeData::CustomFormat& GetFileSystemFileCustomFormat() {
 301   static const char kFormatString[] = "chromium/x-file-system-files";
 302   CR_DEFINE_STATIC_LOCAL(ui::OSExchangeData::CustomFormat,
 303                          format,
 304                          (ui::Clipboard::GetFormatType(kFormatString)));
 305   return format;
 306 }
 307
 308 // Writes file system files to the pickle.
 309 void WriteFileSystemFilesToPickle(
 310     const std::vector<DropData::FileSystemFileInfo>& file_system_files,
 311     Pickle* pickle) {
 312   pickle->WriteUInt64(file_system_files.size());
 313   for (size_t i = 0; i < file_system_files.size(); ++i) {
 314     pickle->WriteString(file_system_files[i].url.spec());
 315     pickle->WriteInt64(file_system_files[i].size);
 316   }
 317 }
 318
 319 // Reads file system files from the pickle.
 320 bool ReadFileSystemFilesFromPickle(
 321     const Pickle& pickle,
 322     std::vector<DropData::FileSystemFileInfo>* file_system_files) {
 323   PickleIterator iter(pickle);
 324
 325   uint64 num_files = 0;
 326   if (!pickle.ReadUInt64(&iter, &num_files))
 327     return false;
 328   file_system_files->resize(num_files);
 329
 330   for (uint64 i = 0; i < num_files; ++i) {
 331     std::string url_string;
 332     int64 size = 0;
 333     if (!pickle.ReadString(&iter, &url_string) ||
 334         !pickle.ReadInt64(&iter, &size))
 335       return false;
 336
 337     GURL url(url_string);
 338     if (!url.is_valid())
 339       return false;
 340
 341     (*file_system_files)[i].url = url;
 342     (*file_system_files)[i].size = size;
 343   }
 344   return true;
 345 }
 346
 347 // Utility to fill a ui::OSExchangeDataProvider object from DropData.
 348 void PrepareDragData(const DropData& drop_data,
 349                      ui::OSExchangeData::Provider* provider,
 350                      WebContentsImpl* web_contents) {
 351   provider->MarkOriginatedFromRenderer();
 352 #if defined(OS_WIN)
 353   // Put download before file contents to prefer the download of a image over
 354   // its thumbnail link.
 355   if (!drop_data.download_metadata.empty())
 356     PrepareDragForDownload(drop_data, provider, web_contents);
 357 #endif
 358 #if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
 359   // We set the file contents before the URL because the URL also sets file
 360   // contents (to a .URL shortcut).  We want to prefer file content data over
 361   // a shortcut so we add it first.
 362   if (!drop_data.file_contents.empty())
 363     PrepareDragForFileContents(drop_data, provider);
 364 #endif
 365   // Call SetString() before SetURL() when we actually have a custom string.
 366   // SetURL() will itself do SetString() when a string hasn't been set yet,
 367   // but we want to prefer drop_data.text.string() over the URL string if it
 368   // exists.
 369   if (!drop_data.text.string().empty())
 370     provider->SetString(drop_data.text.string());
 371   if (drop_data.url.is_valid())
 372     provider->SetURL(drop_data.url, drop_data.url_title);
 373   if (!drop_data.html.string().empty())
 374     provider->SetHtml(drop_data.html.string(), drop_data.html_base_url);
 375   if (!drop_data.filenames.empty())
 376     provider->SetFilenames(drop_data.filenames);
 377   if (!drop_data.file_system_files.empty()) {
 378     Pickle pickle;
 379     WriteFileSystemFilesToPickle(drop_data.file_system_files, &pickle);
 380     provider->SetPickledData(GetFileSystemFileCustomFormat(), pickle);
 381   }
 382   if (!drop_data.custom_data.empty()) {
 383     Pickle pickle;
 384     ui::WriteCustomDataToPickle(drop_data.custom_data, &pickle);
 385     provider->SetPickledData(ui::Clipboard::GetWebCustomDataFormatType(),
 386                              pickle);
 387   }
 388 }
 389
 390 // Utility to fill a DropData object from ui::OSExchangeData.
 391 void PrepareDropData(DropData* drop_data, const ui::OSExchangeData& data) {
 392   drop_data->did_originate_from_renderer = data.DidOriginateFromRenderer();
 393
 394   base::string16 plain_text;
 395   data.GetString(&plain_text);
 396   if (!plain_text.empty())
 397     drop_data->text = base::NullableString16(plain_text, false);
 398
 399   GURL url;
 400   base::string16 url_title;
 401   data.GetURLAndTitle(
 402       ui::OSExchangeData::DO_NOT_CONVERT_FILENAMES, &url, &url_title);
 403   if (url.is_valid()) {
 404     drop_data->url = url;
 405     drop_data->url_title = url_title;
 406   }
 407
 408   base::string16 html;
 409   GURL html_base_url;
 410   data.GetHtml(&html, &html_base_url);
 411   if (!html.empty())
 412     drop_data->html = base::NullableString16(html, false);
 413   if (html_base_url.is_valid())
 414     drop_data->html_base_url = html_base_url;
 415
 416   data.GetFilenames(&drop_data->filenames);
 417
 418   Pickle pickle;
 419   std::vector<DropData::FileSystemFileInfo> file_system_files;
 420   if (data.GetPickledData(GetFileSystemFileCustomFormat(), &pickle) &&
 421       ReadFileSystemFilesFromPickle(pickle, &file_system_files))
 422     drop_data->file_system_files = file_system_files;
 423
 424   if (data.GetPickledData(ui::Clipboard::GetWebCustomDataFormatType(), &pickle))
 425     ui::ReadCustomDataIntoMap(
 426         pickle.data(), pickle.size(), &drop_data->custom_data);
 427 }
 428
 429 // Utilities to convert between blink::WebDragOperationsMask and
 430 // ui::DragDropTypes.
 431 int ConvertFromWeb(blink::WebDragOperationsMask ops) {
 432   int drag_op = ui::DragDropTypes::DRAG_NONE;
 433   if (ops & blink::WebDragOperationCopy)
 434     drag_op |= ui::DragDropTypes::DRAG_COPY;
 435   if (ops & blink::WebDragOperationMove)
 436     drag_op |= ui::DragDropTypes::DRAG_MOVE;
 437   if (ops & blink::WebDragOperationLink)
 438     drag_op |= ui::DragDropTypes::DRAG_LINK;
 439   return drag_op;
 440 }
 441
 442 blink::WebDragOperationsMask ConvertToWeb(int drag_op) {
 443   int web_drag_op = blink::WebDragOperationNone;
 444   if (drag_op & ui::DragDropTypes::DRAG_COPY)
 445     web_drag_op |= blink::WebDragOperationCopy;
 446   if (drag_op & ui::DragDropTypes::DRAG_MOVE)
 447     web_drag_op |= blink::WebDragOperationMove;
 448   if (drag_op & ui::DragDropTypes::DRAG_LINK)
 449     web_drag_op |= blink::WebDragOperationLink;
 450   return (blink::WebDragOperationsMask) web_drag_op;
 451 }
 452
 453 int ConvertAuraEventFlagsToWebInputEventModifiers(int aura_event_flags) {
 454   int web_input_event_modifiers = 0;
 455   if (aura_event_flags & ui::EF_SHIFT_DOWN)
 456     web_input_event_modifiers |= blink::WebInputEvent::ShiftKey;
 457   if (aura_event_flags & ui::EF_CONTROL_DOWN)
 458     web_input_event_modifiers |= blink::WebInputEvent::ControlKey;
 459   if (aura_event_flags & ui::EF_ALT_DOWN)
 460     web_input_event_modifiers |= blink::WebInputEvent::AltKey;
 461   if (aura_event_flags & ui::EF_COMMAND_DOWN)
 462     web_input_event_modifiers |= blink::WebInputEvent::MetaKey;
 463   return web_input_event_modifiers;
 464 }
 465
 466 }  // namespace
 467
 468 class WebContentsViewAura::WindowObserver
 469     : public aura::WindowObserver, public aura::WindowTreeHostObserver {
 470  public:
 471   explicit WindowObserver(WebContentsViewAura* view)
 472       : view_(view),
 473         host_window_(NULL) {
 474     view_->window_->AddObserver(this);
 475
 476 #if defined(OS_WIN)
 477     if (view_->window_->GetRootWindow())
 478       view_->window_->GetRootWindow()->AddObserver(this);
 479 #endif
 480   }
 481
 482   virtual ~WindowObserver() {
 483     view_->window_->RemoveObserver(this);
 484     if (view_->window_->GetHost())
 485       view_->window_->GetHost()->RemoveObserver(this);
 486     if (host_window_)
 487       host_window_->RemoveObserver(this);
 488 #if defined(OS_WIN)
 489     if (host_window_) {
 490       const aura::Window::Windows& children = host_window_->children();
 491       for (size_t i = 0; i < children.size(); ++i)
 492         children[i]->RemoveObserver(this);
 493     }
 494
 495     aura::Window* root_window = view_->window_->GetRootWindow();
 496     if (root_window) {
 497       root_window->RemoveObserver(this);
 498       const aura::Window::Windows& root_children = root_window->children();
 499       for (size_t i = 0; i < root_children.size(); ++i)
 500         root_children[i]->RemoveObserver(this);
 501     }
 502 #endif
 503   }
 504
 505   // Overridden from aura::WindowObserver:
 506 #if defined(OS_WIN)
 507   // Constrained windows are added as children of the parent's parent's view
 508   // which may overlap with windowed NPAPI plugins. In that case, tell the RWHV
 509   // so that it can update the plugins' cutout rects accordingly.
 510   // Note: this is hard coding how Chrome layer adds its dialogs. Since NPAPI is
 511   // going to be deprecated in a year, this is ok for now. The test for this is
 512   // PrintPreviewTest.WindowedNPAPIPluginHidden.
 513   virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE {
 514     if (!new_window->Contains(view_->window_.get())) {
 515       // Skip the case when the parent moves to the root window.
 516       if (new_window != host_window_) {
 517         // Observe sibling windows of the WebContents, or children of the root
 518         // window.
 519         if (new_window->parent() == host_window_ ||
 520             new_window->parent() == view_->window_->GetRootWindow()) {
 521           new_window->AddObserver(this);
 522         }
 523       }
 524     }
 525
 526     if (new_window->parent() == host_window_) {
 527       UpdateConstrainedWindows(NULL);
 528     }
 529   }
 530
 531   virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE {
 532     if (window == view_->window_)
 533       return;
 534
 535     window->RemoveObserver(this);
 536     UpdateConstrainedWindows(window);
 537   }
 538
 539   virtual void OnWindowVisibilityChanged(aura::Window* window,
 540                                          bool visible) OVERRIDE {
 541     if (window == view_->window_ ||
 542         window->parent() == host_window_ ||
 543         window->parent() == view_->window_->GetRootWindow()) {
 544       UpdateConstrainedWindows(NULL);
 545     }
 546   }
 547 #endif
 548
 549   virtual void OnWindowParentChanged(aura::Window* window,
 550                                      aura::Window* parent) OVERRIDE {
 551     if (window != view_->window_)
 552       return;
 553
 554     // Use the new parent's root window for calculating HiDPI subpixel offset.
 555     RenderWidgetHostViewAura* rwhv = ToRenderWidgetHostViewAura(
 556         view_->web_contents_->GetRenderWidgetHostView());
 557     if (rwhv)
 558       rwhv->SnapToPhysicalPixelBoundary();
 559
 560     aura::Window* host_window =
 561         window->GetProperty(aura::client::kHostWindowKey);
 562     if (!host_window)
 563       host_window = parent;
 564
 565     if (host_window_)
 566       host_window_->RemoveObserver(this);
 567
 568 #if defined(OS_WIN)
 569     if (host_window_) {
 570       const aura::Window::Windows& children = host_window_->children();
 571       for (size_t i = 0; i < children.size(); ++i)
 572         children[i]->RemoveObserver(this);
 573
 574       if (rwhv)
 575         rwhv->UpdateConstrainedWindowRects(std::vector<gfx::Rect>());
 576     }
 577
 578     // When we get parented to the root window, the code below will watch the
 579     // host window, aka root window. Since we already watch the root window on
 580     // Windows, unregister first so that the debug check doesn't fire.
 581     if (host_window && host_window == window->GetRootWindow())
 582       host_window->RemoveObserver(this);
 583
 584     // We need to undo the above if we were parented to the root window and then
 585     // got parented to another window. At that point, the code before the ifdef
 586     // would have stopped watching the root window.
 587     if (window->GetRootWindow() &&
 588         host_window != window->GetRootWindow() &&
 589         !window->GetRootWindow()->HasObserver(this)) {
 590       window->GetRootWindow()->AddObserver(this);
 591     }
 592 #endif
 593
 594     host_window_ = host_window;
 595     if (host_window) {
 596       host_window->AddObserver(this);
 597 #if defined(OS_WIN)
 598       if (host_window != window->GetRootWindow()) {
 599         const aura::Window::Windows& children = host_window->children();
 600         for (size_t i = 0; i < children.size(); ++i) {
 601           if (!children[i]->Contains(view_->window_.get()))
 602             children[i]->AddObserver(this);
 603         }
 604       }
 605 #endif
 606     }
 607   }
 608
 609   virtual void OnWindowBoundsChanged(aura::Window* window,
 610                                      const gfx::Rect& old_bounds,
 611                                      const gfx::Rect& new_bounds) OVERRIDE {
 612     if (window == host_window_ || window == view_->window_) {
 613       SendScreenRects();
 614       if (view_->touch_editable_)
 615         view_->touch_editable_->UpdateEditingController();
 616 #if defined(OS_WIN)
 617     } else {
 618       UpdateConstrainedWindows(NULL);
 619 #endif
 620     }
 621   }
 622
 623   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
 624     if (window == host_window_) {
 625       host_window_->RemoveObserver(this);
 626       host_window_ = NULL;
 627     }
 628   }
 629
 630   virtual void OnWindowAddedToRootWindow(aura::Window* window) OVERRIDE {
 631     if (window == view_->window_) {
 632       window->GetHost()->AddObserver(this);
 633 #if defined(OS_WIN)
 634       if (!window->GetRootWindow()->HasObserver(this))
 635         window->GetRootWindow()->AddObserver(this);
 636 #endif
 637     }
 638   }
 639
 640   virtual void OnWindowRemovingFromRootWindow(aura::Window* window,
 641                                               aura::Window* new_root) OVERRIDE {
 642     if (window == view_->window_) {
 643       window->GetHost()->RemoveObserver(this);
 644 #if defined(OS_WIN)
 645       window->GetRootWindow()->RemoveObserver(this);
 646
 647       const aura::Window::Windows& root_children =
 648           window->GetRootWindow()->children();
 649       for (size_t i = 0; i < root_children.size(); ++i) {
 650         if (root_children[i] != view_->window_ &&
 651             root_children[i] != host_window_) {
 652           root_children[i]->RemoveObserver(this);
 653         }
 654       }
 655 #endif
 656     }
 657   }
 658
 659   // Overridden WindowTreeHostObserver:
 660   virtual void OnHostMoved(const aura::WindowTreeHost* host,
 661                            const gfx::Point& new_origin) OVERRIDE {
 662     TRACE_EVENT1("ui",
 663                  "WebContentsViewAura::WindowObserver::OnHostMoved",
 664                  "new_origin", new_origin.ToString());
 665
 666     // This is for the desktop case (i.e. Aura desktop).
 667     SendScreenRects();
 668   }
 669
 670  private:
 671   void SendScreenRects() {
 672     RenderWidgetHostImpl::From(view_->web_contents_->GetRenderViewHost())->
 673         SendScreenRects();
 674   }
 675
 676 #if defined(OS_WIN)
 677   void UpdateConstrainedWindows(aura::Window* exclude) {
 678     RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
 679         view_->web_contents_->GetRenderWidgetHostView());
 680     if (!view)
 681       return;
 682
 683     std::vector<gfx::Rect> constrained_windows;
 684     if (host_window_) {
 685       const aura::Window::Windows& children = host_window_->children();
 686       for (size_t i = 0; i < children.size(); ++i) {
 687         if (!children[i]->Contains(view_->window_.get()) &&
 688             children[i] != exclude &&
 689             children[i]->IsVisible()) {
 690           constrained_windows.push_back(children[i]->GetBoundsInRootWindow());
 691         }
 692       }
 693     }
 694
 695     aura::Window* root_window = view_->window_->GetRootWindow();
 696     const aura::Window::Windows& root_children = root_window->children();
 697     if (root_window) {
 698       for (size_t i = 0; i < root_children.size(); ++i) {
 699         if (root_children[i]->IsVisible() &&
 700             !root_children[i]->Contains(view_->window_.get())) {
 701           constrained_windows.push_back(
 702               root_children[i]->GetBoundsInRootWindow());
 703         }
 704       }
 705     }
 706
 707     view->UpdateConstrainedWindowRects(constrained_windows);
 708   }
 709 #endif
 710
 711   WebContentsViewAura* view_;
 712
 713   // The parent window that hosts the constrained windows. We cache the old host
 714   // view so that we can unregister when it's not the parent anymore.
 715   aura::Window* host_window_;
 716
 717   DISALLOW_COPY_AND_ASSIGN(WindowObserver);
 718 };
 719
 720 ////////////////////////////////////////////////////////////////////////////////
 721 // WebContentsViewAura, public:
 722
 723 WebContentsViewAura::WebContentsViewAura(
 724     WebContentsImpl* web_contents,
 725     WebContentsViewDelegate* delegate)
 726     : web_contents_(web_contents),
 727       delegate_(delegate),
 728       current_drag_op_(blink::WebDragOperationNone),
 729       drag_dest_delegate_(NULL),
 730       current_rvh_for_drag_(NULL),
 731       overscroll_change_brightness_(false),
 732       current_overscroll_gesture_(OVERSCROLL_NONE),
 733       completed_overscroll_gesture_(OVERSCROLL_NONE),
 734       touch_editable_(TouchEditableImplAura::Create()),
 735       is_or_was_visible_(false) {
 736 }
 737
 738 ////////////////////////////////////////////////////////////////////////////////
 739 // WebContentsViewAura, private:
 740
 741 WebContentsViewAura::~WebContentsViewAura() {
 742   if (!window_)
 743     return;
 744
 745   window_observer_.reset();
 746   window_->RemoveObserver(this);
 747
 748   // Window needs a valid delegate during its destructor, so we explicitly
 749   // delete it here.
 750   window_.reset();
 751 }
 752
 753 void WebContentsViewAura::SetTouchEditableForTest(
 754     TouchEditableImplAura* touch_editable) {
 755   touch_editable_.reset(touch_editable);
 756   AttachTouchEditableToRenderView();
 757 }
 758
 759 void WebContentsViewAura::SizeChangedCommon(const gfx::Size& size) {
 760   if (web_contents_->GetInterstitialPage())
 761     web_contents_->GetInterstitialPage()->SetSize(size);
 762   RenderWidgetHostView* rwhv =
 763       web_contents_->GetRenderWidgetHostView();
 764   if (rwhv)
 765     rwhv->SetSize(size);
 766 }
 767
 768 void WebContentsViewAura::EndDrag(blink::WebDragOperationsMask ops) {
 769   aura::Window* root_window = GetNativeView()->GetRootWindow();
 770   gfx::Point screen_loc =
 771       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
 772   gfx::Point client_loc = screen_loc;
 773   RenderViewHost* rvh = web_contents_->GetRenderViewHost();
 774   aura::Window* window = rvh->GetView()->GetNativeView();
 775   aura::Window::ConvertPointToTarget(root_window, window, &client_loc);
 776   if (!web_contents_)
 777     return;
 778   web_contents_->DragSourceEndedAt(client_loc.x(), client_loc.y(),
 779       screen_loc.x(), screen_loc.y(), ops);
 780 }
 781
 782 void WebContentsViewAura::InstallOverscrollControllerDelegate(
 783     RenderWidgetHostViewAura* view) {
 784   const std::string value = CommandLine::ForCurrentProcess()->
 785       GetSwitchValueASCII(switches::kOverscrollHistoryNavigation);
 786   if (value == "0") {
 787     navigation_overlay_.reset();
 788     return;
 789   }
 790   if (value == "2") {
 791     navigation_overlay_.reset();
 792     if (!gesture_nav_simple_)
 793       gesture_nav_simple_.reset(new GestureNavSimple(web_contents_));
 794     view->overscroll_controller()->set_delegate(gesture_nav_simple_.get());
 795     return;
 796   }
 797   view->overscroll_controller()->set_delegate(this);
 798   if (!navigation_overlay_)
 799     navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
 800 }
 801
 802 void WebContentsViewAura::PrepareOverscrollWindow() {
 803   // If there is an existing |overscroll_window_| which is in the middle of an
 804   // animation, then destroying the window here causes the animation to be
 805   // completed immidiately, which triggers |OnImplicitAnimationsCompleted()|
 806   // callback, and that tries to reset |overscroll_window_| again, causing a
 807   // double-free. So use a temporary variable here.
 808   if (overscroll_window_) {
 809     base::AutoReset<OverscrollMode> reset_state(&current_overscroll_gesture_,
 810                                                 current_overscroll_gesture_);
 811     scoped_ptr<aura::Window> reset_window(overscroll_window_.release());
 812   }
 813
 814   OverscrollWindowDelegate* overscroll_delegate = new OverscrollWindowDelegate(
 815       web_contents_,
 816       current_overscroll_gesture_);
 817   overscroll_window_.reset(new aura::Window(overscroll_delegate));
 818   overscroll_window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
 819   overscroll_window_->SetTransparent(true);
 820   overscroll_window_->Init(aura::WINDOW_LAYER_TEXTURED);
 821   overscroll_window_->layer()->SetMasksToBounds(false);
 822   overscroll_window_->SetName("OverscrollOverlay");
 823
 824   overscroll_change_brightness_ = overscroll_delegate->has_image();
 825   window_->AddChild(overscroll_window_.get());
 826
 827   gfx::Rect bounds = gfx::Rect(window_->bounds().size());
 828   if (ShouldNavigateForward(web_contents_->GetController(),
 829                             current_overscroll_gesture_)) {
 830     // The overlay will be sliding in from the right edge towards the left in
 831     // non-RTL, or sliding in from the left edge towards the right in RTL.
 832     // So position the overlay window accordingly.
 833     bounds.Offset(base::i18n::IsRTL() ? -bounds.width() : bounds.width(), 0);
 834   }
 835
 836   aura::Window* animate_window = GetWindowToAnimateForOverscroll();
 837   if (animate_window == overscroll_window_)
 838     window_->StackChildAbove(overscroll_window_.get(), GetContentNativeView());
 839   else
 840     window_->StackChildBelow(overscroll_window_.get(), GetContentNativeView());
 841
 842   UpdateOverscrollWindowBrightness(0.f);
 843
 844   overscroll_window_->SetBounds(bounds);
 845   overscroll_window_->Show();
 846
 847   overscroll_shadow_.reset(new ShadowLayerDelegate(animate_window->layer()));
 848 }
 849
 850 void WebContentsViewAura::PrepareContentWindowForOverscroll() {
 851   StopObservingImplicitAnimations();
 852   aura::Window* content = GetContentNativeView();
 853   content->layer()->GetAnimator()->AbortAllAnimations();
 854   content->SetTransform(gfx::Transform());
 855   content->layer()->SetLayerBrightness(0.f);
 856 }
 857
 858 void WebContentsViewAura::ResetOverscrollTransform() {
 859   if (!web_contents_->GetRenderWidgetHostView())
 860     return;
 861   aura::Window* target = GetWindowToAnimateForOverscroll();
 862   if (!target)
 863     return;
 864   {
 865     ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
 866     settings.SetPreemptionStrategy(
 867         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 868     settings.SetTweenType(gfx::Tween::EASE_OUT);
 869     settings.AddObserver(this);
 870     target->SetTransform(gfx::Transform());
 871   }
 872   {
 873     ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
 874     settings.SetPreemptionStrategy(
 875         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 876     settings.SetTweenType(gfx::Tween::EASE_OUT);
 877     UpdateOverscrollWindowBrightness(0.f);
 878   }
 879 }
 880
 881 void WebContentsViewAura::CompleteOverscrollNavigation(OverscrollMode mode) {
 882   if (!web_contents_->GetRenderWidgetHostView())
 883     return;
 884
 885   // Animate out the current view first. Navigate to the requested history at
 886   // the end of the animation.
 887   if (current_overscroll_gesture_ == OVERSCROLL_NONE)
 888     return;
 889
 890   UMA_HISTOGRAM_ENUMERATION("Overscroll.Navigated",
 891                             current_overscroll_gesture_, OVERSCROLL_COUNT);
 892   OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
 893       overscroll_window_->delegate());
 894   delegate->stop_forwarding_events();
 895
 896   completed_overscroll_gesture_ = mode;
 897   aura::Window* target = GetWindowToAnimateForOverscroll();
 898   ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
 899   settings.SetPreemptionStrategy(
 900       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 901   settings.SetTweenType(gfx::Tween::EASE_OUT);
 902   settings.AddObserver(this);
 903   gfx::Transform transform;
 904   int content_width =
 905       web_contents_->GetRenderWidgetHostView()->GetViewBounds().width();
 906   int translate_x = mode == OVERSCROLL_WEST ? -content_width : content_width;
 907   transform.Translate(translate_x, 0);
 908   target->SetTransform(transform);
 909   UpdateOverscrollWindowBrightness(translate_x);
 910 }
 911
 912 aura::Window* WebContentsViewAura::GetWindowToAnimateForOverscroll() {
 913   if (current_overscroll_gesture_ == OVERSCROLL_NONE)
 914     return NULL;
 915
 916   return ShouldNavigateForward(web_contents_->GetController(),
 917                                current_overscroll_gesture_) ?
 918       overscroll_window_.get() : GetContentNativeView();
 919 }
 920
 921 gfx::Vector2d WebContentsViewAura::GetTranslationForOverscroll(int delta_x,
 922                                                                int delta_y) {
 923   if (current_overscroll_gesture_ == OVERSCROLL_NORTH ||
 924       current_overscroll_gesture_ == OVERSCROLL_SOUTH) {
 925     return gfx::Vector2d(0, delta_y);
 926   }
 927   // For horizontal overscroll, scroll freely if a navigation is possible. Do a
 928   // resistive scroll otherwise.
 929   const NavigationControllerImpl& controller = web_contents_->GetController();
 930   const gfx::Rect& bounds = GetViewBounds();
 931   if (ShouldNavigateForward(controller, current_overscroll_gesture_))
 932     return gfx::Vector2d(std::max(-bounds.width(), delta_x), 0);
 933   else if (ShouldNavigateBack(controller, current_overscroll_gesture_))
 934     return gfx::Vector2d(std::min(bounds.width(), delta_x), 0);
 935   return gfx::Vector2d();
 936 }
 937
 938 void WebContentsViewAura::PrepareOverscrollNavigationOverlay() {
 939   OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
 940       overscroll_window_->delegate());
 941   overscroll_window_->SchedulePaintInRect(
 942       gfx::Rect(overscroll_window_->bounds().size()));
 943   overscroll_window_->SetBounds(gfx::Rect(window_->bounds().size()));
 944   overscroll_window_->SetTransform(gfx::Transform());
 945   navigation_overlay_->SetOverlayWindow(overscroll_window_.Pass(),
 946                                         delegate);
 947   navigation_overlay_->StartObserving();
 948 }
 949
 950 void WebContentsViewAura::UpdateOverscrollWindowBrightness(float delta_x) {
 951   if (!overscroll_change_brightness_)
 952     return;
 953
 954   const float kBrightnessMin = -.1f;
 955   const float kBrightnessMax = -.01f;
 956
 957   float ratio = fabs(delta_x) / GetViewBounds().width();
 958   ratio = std::min(1.f, ratio);
 959   if (base::i18n::IsRTL())
 960     ratio = 1.f - ratio;
 961   float brightness = current_overscroll_gesture_ == OVERSCROLL_WEST ?
 962       kBrightnessMin + ratio * (kBrightnessMax - kBrightnessMin) :
 963       kBrightnessMax - ratio * (kBrightnessMax - kBrightnessMin);
 964   brightness = std::max(kBrightnessMin, brightness);
 965   brightness = std::min(kBrightnessMax, brightness);
 966   aura::Window* window = GetWindowToAnimateForOverscroll();
 967   window->layer()->SetLayerBrightness(brightness);
 968 }
 969
 970 void WebContentsViewAura::AttachTouchEditableToRenderView() {
 971   if (!touch_editable_)
 972     return;
 973   RenderWidgetHostViewAura* rwhva = ToRenderWidgetHostViewAura(
 974       web_contents_->GetRenderWidgetHostView());
 975   touch_editable_->AttachToView(rwhva);
 976 }
 977
 978 void WebContentsViewAura::OverscrollUpdateForWebContentsDelegate(int delta_y) {
 979   if (web_contents_->GetDelegate() && IsScrollEndEffectEnabled())
 980     web_contents_->GetDelegate()->OverscrollUpdate(delta_y);
 981 }
 982
 983 ////////////////////////////////////////////////////////////////////////////////
 984 // WebContentsViewAura, WebContentsView implementation:
 985
 986 gfx::NativeView WebContentsViewAura::GetNativeView() const {
 987   return window_.get();
 988 }
 989
 990 gfx::NativeView WebContentsViewAura::GetContentNativeView() const {
 991   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
 992   return rwhv ? rwhv->GetNativeView() : NULL;
 993 }
 994
 995 gfx::NativeWindow WebContentsViewAura::GetTopLevelNativeWindow() const {
 996   return window_->GetToplevelWindow();
 997 }
 998
 999 void WebContentsViewAura::GetContainerBounds(gfx::Rect *out) const {
1000   *out = window_->GetBoundsInScreen();
1001 }
1002
1003 void WebContentsViewAura::SizeContents(const gfx::Size& size) {
1004   gfx::Rect bounds = window_->bounds();
1005   if (bounds.size() != size) {
1006     bounds.set_size(size);
1007     window_->SetBounds(bounds);
1008   } else {
1009     // Our size matches what we want but the renderers size may not match.
1010     // Pretend we were resized so that the renderers size is updated too.
1011     SizeChangedCommon(size);
1012   }
1013 }
1014
1015 void WebContentsViewAura::Focus() {
1016   if (web_contents_->GetInterstitialPage()) {
1017     web_contents_->GetInterstitialPage()->Focus();
1018     return;
1019   }
1020
1021   if (delegate_.get() && delegate_->Focus())
1022     return;
1023
1024   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
1025   if (rwhv)
1026     rwhv->Focus();
1027 }
1028
1029 void WebContentsViewAura::SetInitialFocus() {
1030   if (web_contents_->FocusLocationBarByDefault())
1031     web_contents_->SetFocusToLocationBar(false);
1032   else
1033     Focus();
1034 }
1035
1036 void WebContentsViewAura::StoreFocus() {
1037   if (delegate_)
1038     delegate_->StoreFocus();
1039 }
1040
1041 void WebContentsViewAura::RestoreFocus() {
1042   if (delegate_)
1043     delegate_->RestoreFocus();
1044 }
1045
1046 DropData* WebContentsViewAura::GetDropData() const {
1047   return current_drop_data_.get();
1048 }
1049
1050 gfx::Rect WebContentsViewAura::GetViewBounds() const {
1051   return window_->GetBoundsInScreen();
1052 }
1053
1054 ////////////////////////////////////////////////////////////////////////////////
1055 // WebContentsViewAura, WebContentsView implementation:
1056
1057 void WebContentsViewAura::CreateView(
1058     const gfx::Size& initial_size, gfx::NativeView context) {
1059   // NOTE: we ignore |initial_size| since in some cases it's wrong (such as
1060   // if the bookmark bar is not shown and you create a new tab). The right
1061   // value is set shortly after this, so its safe to ignore.
1062
1063   aura::Env::CreateInstance(true);
1064   window_.reset(new aura::Window(this));
1065   window_->set_owned_by_parent(false);
1066   window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
1067   window_->SetTransparent(false);
1068   window_->Init(aura::WINDOW_LAYER_NOT_DRAWN);
1069   window_->AddObserver(this);
1070   aura::Window* root_window = context ? context->GetRootWindow() : NULL;
1071   if (root_window) {
1072     // There are places where there is no context currently because object
1073     // hierarchies are built before they're attached to a Widget. (See
1074     // views::WebView as an example; GetWidget() returns NULL at the point
1075     // where we are created.)
1076     //
1077     // It should be OK to not set a default parent since such users will
1078     // explicitly add this WebContentsViewAura to their tree after they create
1079     // us.
1080     if (root_window) {
1081       aura::client::ParentWindowWithContext(
1082           window_.get(), root_window, root_window->GetBoundsInScreen());
1083     }
1084   }
1085   window_->layer()->SetMasksToBounds(true);
1086   window_->SetName("WebContentsViewAura");
1087
1088   // WindowObserver is not interesting and is problematic for Browser Plugin
1089   // guests.
1090   // The use cases for WindowObserver do not apply to Browser Plugins:
1091   // 1) guests do not support NPAPI plugins.
1092   // 2) guests' window bounds are supposed to come from its embedder.
1093   if (!BrowserPluginGuest::IsGuest(web_contents_))
1094     window_observer_.reset(new WindowObserver(this));
1095
1096   // delegate_->GetDragDestDelegate() creates a new delegate on every call.
1097   // Hence, we save a reference to it locally. Similar model is used on other
1098   // platforms as well.
1099   if (delegate_)
1100     drag_dest_delegate_ = delegate_->GetDragDestDelegate();
1101 }
1102
1103 RenderWidgetHostViewBase* WebContentsViewAura::CreateViewForWidget(
1104     RenderWidgetHost* render_widget_host) {
1105   if (render_widget_host->GetView()) {
1106     // During testing, the view will already be set up in most cases to the
1107     // test view, so we don't want to clobber it with a real one. To verify that
1108     // this actually is happening (and somebody isn't accidentally creating the
1109     // view twice), we check for the RVH Factory, which will be set when we're
1110     // making special ones (which go along with the special views).
1111     DCHECK(RenderViewHostFactory::has_factory());
1112     return static_cast<RenderWidgetHostViewBase*>(
1113         render_widget_host->GetView());
1114   }
1115
1116   RenderWidgetHostViewAura* view =
1117       new RenderWidgetHostViewAura(render_widget_host);
1118   view->InitAsChild(NULL);
1119   GetNativeView()->AddChild(view->GetNativeView());
1120
1121   if (navigation_overlay_.get() && navigation_overlay_->has_window()) {
1122     navigation_overlay_->StartObserving();
1123   }
1124
1125   RenderWidgetHostImpl* host_impl =
1126       RenderWidgetHostImpl::From(render_widget_host);
1127
1128   if (!host_impl->is_hidden())
1129     view->Show();
1130
1131   // We listen to drag drop events in the newly created view's window.
1132   aura::client::SetDragDropDelegate(view->GetNativeView(), this);
1133
1134   if (view->overscroll_controller() &&
1135       (!web_contents_->GetDelegate() ||
1136        web_contents_->GetDelegate()->CanOverscrollContent())) {
1137     InstallOverscrollControllerDelegate(view);
1138   }
1139
1140   AttachTouchEditableToRenderView();
1141   return view;
1142 }
1143
1144 RenderWidgetHostViewBase* WebContentsViewAura::CreateViewForPopupWidget(
1145     RenderWidgetHost* render_widget_host) {
1146   return new RenderWidgetHostViewAura(render_widget_host);
1147 }
1148
1149 void WebContentsViewAura::SetPageTitle(const base::string16& title) {
1150   window_->SetTitle(title);
1151 }
1152
1153 void WebContentsViewAura::RenderViewCreated(RenderViewHost* host) {
1154 }
1155
1156 void WebContentsViewAura::RenderViewSwappedIn(RenderViewHost* host) {
1157   if (navigation_overlay_.get() && navigation_overlay_->has_window())
1158     navigation_overlay_->StartObserving();
1159   AttachTouchEditableToRenderView();
1160 }
1161
1162 void WebContentsViewAura::SetOverscrollControllerEnabled(bool enabled) {
1163   RenderWidgetHostViewAura* view =
1164       ToRenderWidgetHostViewAura(web_contents_->GetRenderWidgetHostView());
1165   if (view) {
1166     view->SetOverscrollControllerEnabled(enabled);
1167     if (enabled)
1168       InstallOverscrollControllerDelegate(view);
1169   }
1170
1171   if (!enabled)
1172     navigation_overlay_.reset();
1173   else if (!navigation_overlay_)
1174     navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
1175 }
1176
1177 ////////////////////////////////////////////////////////////////////////////////
1178 // WebContentsViewAura, RenderViewHostDelegateView implementation:
1179
1180 void WebContentsViewAura::ShowContextMenu(RenderFrameHost* render_frame_host,
1181                                           const ContextMenuParams& params) {
1182   if (touch_editable_) {
1183     touch_editable_->EndTouchEditing(false);
1184   }
1185   if (delegate_) {
1186     delegate_->ShowContextMenu(render_frame_host, params);
1187     // WARNING: we may have been deleted during the call to ShowContextMenu().
1188   }
1189 }
1190
1191 void WebContentsViewAura::StartDragging(
1192     const DropData& drop_data,
1193     blink::WebDragOperationsMask operations,
1194     const gfx::ImageSkia& image,
1195     const gfx::Vector2d& image_offset,
1196     const DragEventSourceInfo& event_info) {
1197   aura::Window* root_window = GetNativeView()->GetRootWindow();
1198   if (!aura::client::GetDragDropClient(root_window)) {
1199     web_contents_->SystemDragEnded();
1200     return;
1201   }
1202
1203   if (touch_editable_)
1204     touch_editable_->EndTouchEditing(false);
1205
1206   ui::OSExchangeData::Provider* provider = ui::OSExchangeData::CreateProvider();
1207   PrepareDragData(drop_data, provider, web_contents_);
1208
1209   ui::OSExchangeData data(provider);  // takes ownership of |provider|.
1210
1211   if (!image.isNull())
1212     drag_utils::SetDragImageOnDataObject(image, image_offset, &data);
1213
1214   scoped_ptr<WebDragSourceAura> drag_source(
1215       new WebDragSourceAura(GetNativeView(), web_contents_));
1216
1217   // We need to enable recursive tasks on the message loop so we can get
1218   // updates while in the system DoDragDrop loop.
1219   int result_op = 0;
1220   {
1221     gfx::NativeView content_native_view = GetContentNativeView();
1222     base::MessageLoop::ScopedNestableTaskAllower allow(
1223         base::MessageLoop::current());
1224     result_op = aura::client::GetDragDropClient(root_window)
1225         ->StartDragAndDrop(data,
1226                            root_window,
1227                            content_native_view,
1228                            event_info.event_location,
1229                            ConvertFromWeb(operations),
1230                            event_info.event_source);
1231   }
1232
1233   // Bail out immediately if the contents view window is gone. Note that it is
1234   // not safe to access any class members in this case since |this| may already
1235   // be destroyed. The local variable |drag_source| will still be valid though,
1236   // so we can use it to determine if the window is gone.
1237   if (!drag_source->window()) {
1238     // Note that in this case, we don't need to call SystemDragEnded() since the
1239     // renderer is going away.
1240     return;
1241   }
1242
1243   EndDrag(ConvertToWeb(result_op));
1244   web_contents_->SystemDragEnded();
1245 }
1246
1247 void WebContentsViewAura::UpdateDragCursor(blink::WebDragOperation operation) {
1248   current_drag_op_ = operation;
1249 }
1250
1251 void WebContentsViewAura::GotFocus() {
1252   if (web_contents_->GetDelegate())
1253     web_contents_->GetDelegate()->WebContentsFocused(web_contents_);
1254 }
1255
1256 void WebContentsViewAura::TakeFocus(bool reverse) {
1257   if (web_contents_->GetDelegate() &&
1258       !web_contents_->GetDelegate()->TakeFocus(web_contents_, reverse) &&
1259       delegate_.get()) {
1260     delegate_->TakeFocus(reverse);
1261   }
1262 }
1263
1264 ////////////////////////////////////////////////////////////////////////////////
1265 // WebContentsViewAura, OverscrollControllerDelegate implementation:
1266
1267 gfx::Rect WebContentsViewAura::GetVisibleBounds() const {
1268   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
1269   if (!rwhv || !rwhv->IsShowing())
1270     return gfx::Rect();
1271
1272   return rwhv->GetViewBounds();
1273 }
1274
1275 void WebContentsViewAura::OnOverscrollUpdate(float delta_x, float delta_y) {
1276   if (current_overscroll_gesture_ == OVERSCROLL_NONE)
1277     return;
1278
1279   aura::Window* target = GetWindowToAnimateForOverscroll();
1280   gfx::Vector2d translate = GetTranslationForOverscroll(delta_x, delta_y);
1281   gfx::Transform transform;
1282
1283   // Vertical overscrolls don't participate in the navigation gesture.
1284   if (current_overscroll_gesture_ != OVERSCROLL_NORTH &&
1285       current_overscroll_gesture_ != OVERSCROLL_SOUTH) {
1286     transform.Translate(translate.x(), translate.y());
1287     target->SetTransform(transform);
1288     UpdateOverscrollWindowBrightness(delta_x);
1289   }
1290
1291   OverscrollUpdateForWebContentsDelegate(translate.y());
1292 }
1293
1294 void WebContentsViewAura::OnOverscrollComplete(OverscrollMode mode) {
1295   UMA_HISTOGRAM_ENUMERATION("Overscroll.Completed", mode, OVERSCROLL_COUNT);
1296   OverscrollUpdateForWebContentsDelegate(0);
1297   NavigationControllerImpl& controller = web_contents_->GetController();
1298   if (ShouldNavigateForward(controller, mode) ||
1299       ShouldNavigateBack(controller, mode)) {
1300     CompleteOverscrollNavigation(mode);
1301     return;
1302   }
1303
1304   ResetOverscrollTransform();
1305 }
1306
1307 void WebContentsViewAura::OnOverscrollModeChange(OverscrollMode old_mode,
1308                                                  OverscrollMode new_mode) {
1309   // Reset any in-progress overscroll animation first.
1310   ResetOverscrollTransform();
1311
1312   if (new_mode != OVERSCROLL_NONE && touch_editable_)
1313     touch_editable_->OverscrollStarted();
1314
1315   if (new_mode == OVERSCROLL_NONE ||
1316       !GetContentNativeView() ||
1317       ((new_mode == OVERSCROLL_EAST || new_mode == OVERSCROLL_WEST) &&
1318        navigation_overlay_.get() && navigation_overlay_->has_window())) {
1319     current_overscroll_gesture_ = OVERSCROLL_NONE;
1320     OverscrollUpdateForWebContentsDelegate(0);
1321   } else {
1322     aura::Window* target = GetWindowToAnimateForOverscroll();
1323     if (target) {
1324       StopObservingImplicitAnimations();
1325       target->layer()->GetAnimator()->AbortAllAnimations();
1326     }
1327     // Cleanup state of the content window first, because that can reset the
1328     // value of |current_overscroll_gesture_|.
1329     PrepareContentWindowForOverscroll();
1330
1331     current_overscroll_gesture_ = new_mode;
1332     if (current_overscroll_gesture_ == OVERSCROLL_EAST ||
1333         current_overscroll_gesture_ == OVERSCROLL_WEST)
1334       PrepareOverscrollWindow();
1335
1336     UMA_HISTOGRAM_ENUMERATION("Overscroll.Started", new_mode, OVERSCROLL_COUNT);
1337   }
1338   completed_overscroll_gesture_ = OVERSCROLL_NONE;
1339 }
1340
1341 ////////////////////////////////////////////////////////////////////////////////
1342 // WebContentsViewAura, ui::ImplicitAnimationObserver implementation:
1343
1344 void WebContentsViewAura::OnImplicitAnimationsCompleted() {
1345   overscroll_shadow_.reset();
1346
1347   if (ShouldNavigateForward(web_contents_->GetController(),
1348                             completed_overscroll_gesture_)) {
1349     web_contents_->GetController().GoForward();
1350     PrepareOverscrollNavigationOverlay();
1351   } else if (ShouldNavigateBack(web_contents_->GetController(),
1352                                 completed_overscroll_gesture_)) {
1353     web_contents_->GetController().GoBack();
1354     PrepareOverscrollNavigationOverlay();
1355   } else {
1356     if (touch_editable_)
1357       touch_editable_->OverscrollCompleted();
1358   }
1359
1360   aura::Window* content = GetContentNativeView();
1361   if (content) {
1362     content->SetTransform(gfx::Transform());
1363     content->layer()->SetLayerBrightness(0.f);
1364   }
1365   current_overscroll_gesture_ = OVERSCROLL_NONE;
1366   completed_overscroll_gesture_ = OVERSCROLL_NONE;
1367   overscroll_window_.reset();
1368 }
1369
1370 ////////////////////////////////////////////////////////////////////////////////
1371 // WebContentsViewAura, aura::WindowDelegate implementation:
1372
1373 gfx::Size WebContentsViewAura::GetMinimumSize() const {
1374   return gfx::Size();
1375 }
1376
1377 gfx::Size WebContentsViewAura::GetMaximumSize() const {
1378   return gfx::Size();
1379 }
1380
1381 void WebContentsViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
1382                                           const gfx::Rect& new_bounds) {
1383   SizeChangedCommon(new_bounds.size());
1384   if (delegate_)
1385     delegate_->SizeChanged(new_bounds.size());
1386
1387   // Constrained web dialogs, need to be kept centered over our content area.
1388   for (size_t i = 0; i < window_->children().size(); i++) {
1389     if (window_->children()[i]->GetProperty(
1390             aura::client::kConstrainedWindowKey)) {
1391       gfx::Rect bounds = window_->children()[i]->bounds();
1392       bounds.set_origin(
1393           gfx::Point((new_bounds.width() - bounds.width()) / 2,
1394                      (new_bounds.height() - bounds.height()) / 2));
1395       window_->children()[i]->SetBounds(bounds);
1396     }
1397   }
1398 }
1399
1400 gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {
1401   return gfx::kNullCursor;
1402 }
1403
1404 int WebContentsViewAura::GetNonClientComponent(const gfx::Point& point) const {
1405   return HTCLIENT;
1406 }
1407
1408 bool WebContentsViewAura::ShouldDescendIntoChildForEventHandling(
1409     aura::Window* child,
1410     const gfx::Point& location) {
1411   return true;
1412 }
1413
1414 bool WebContentsViewAura::CanFocus() {
1415   // Do not take the focus if the render widget host view aura is gone or
1416   // is in the process of shutting down because neither the view window nor
1417   // this window can handle key events.
1418   RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
1419       web_contents_->GetRenderWidgetHostView());
1420   if (view != NULL && !view->IsClosing())
1421     return true;
1422
1423   return false;
1424 }
1425
1426 void WebContentsViewAura::OnCaptureLost() {
1427 }
1428
1429 void WebContentsViewAura::OnPaint(gfx::Canvas* canvas) {
1430 }
1431
1432 void WebContentsViewAura::OnDeviceScaleFactorChanged(
1433     float device_scale_factor) {
1434 }
1435
1436 void WebContentsViewAura::OnWindowDestroying(aura::Window* window) {
1437   // This means the destructor is going to be called soon. If there is an
1438   // overscroll gesture in progress (i.e. |overscroll_window_| is not NULL),
1439   // then destroying it in the WebContentsViewAura destructor can trigger other
1440   // virtual functions to be called (e.g. OnImplicitAnimationsCompleted()). So
1441   // destroy the overscroll window here.
1442   navigation_overlay_.reset();
1443   overscroll_window_.reset();
1444 }
1445
1446 void WebContentsViewAura::OnWindowDestroyed(aura::Window* window) {
1447 }
1448
1449 void WebContentsViewAura::OnWindowTargetVisibilityChanged(bool visible) {
1450 }
1451
1452 bool WebContentsViewAura::HasHitTestMask() const {
1453   return false;
1454 }
1455
1456 void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
1457 }
1458
1459 ////////////////////////////////////////////////////////////////////////////////
1460 // WebContentsViewAura, ui::EventHandler implementation:
1461
1462 void WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
1463 }
1464
1465 void WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
1466   if (!web_contents_->GetDelegate())
1467     return;
1468
1469   switch (event->type()) {
1470     case ui::ET_MOUSE_PRESSED:
1471       web_contents_->GetDelegate()->ActivateContents(web_contents_);
1472       break;
1473     case ui::ET_MOUSE_MOVED:
1474     case ui::ET_MOUSE_EXITED:
1475       web_contents_->GetDelegate()->ContentsMouseEvent(
1476           web_contents_,
1477           gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
1478           event->type() == ui::ET_MOUSE_MOVED);
1479       break;
1480     default:
1481       break;
1482   }
1483 }
1484
1485 ////////////////////////////////////////////////////////////////////////////////
1486 // WebContentsViewAura, aura::client::DragDropDelegate implementation:
1487
1488 void WebContentsViewAura::OnDragEntered(const ui::DropTargetEvent& event) {
1489   current_rvh_for_drag_ = web_contents_->GetRenderViewHost();
1490   current_drop_data_.reset(new DropData());
1491
1492   PrepareDropData(current_drop_data_.get(), event.data());
1493   blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());
1494
1495   // Give the delegate an opportunity to cancel the drag.
1496   if (!web_contents_->GetDelegate()->CanDragEnter(web_contents_,
1497                                                   *current_drop_data_.get(),
1498                                                   op)) {
1499     current_drop_data_.reset(NULL);
1500     return;
1501   }
1502
1503   if (drag_dest_delegate_)
1504     drag_dest_delegate_->DragInitialize(web_contents_);
1505
1506   gfx::Point screen_pt =
1507       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
1508   web_contents_->GetRenderViewHost()->DragTargetDragEnter(
1509       *current_drop_data_.get(), event.location(), screen_pt, op,
1510       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1511
1512   if (drag_dest_delegate_) {
1513     drag_dest_delegate_->OnReceiveDragData(event.data());
1514     drag_dest_delegate_->OnDragEnter();
1515   }
1516 }
1517
1518 int WebContentsViewAura::OnDragUpdated(const ui::DropTargetEvent& event) {
1519   DCHECK(current_rvh_for_drag_);
1520   if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1521     OnDragEntered(event);
1522
1523   if (!current_drop_data_)
1524     return ui::DragDropTypes::DRAG_NONE;
1525
1526   blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());
1527   gfx::Point screen_pt =
1528       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
1529   web_contents_->GetRenderViewHost()->DragTargetDragOver(
1530       event.location(), screen_pt, op,
1531       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1532
1533   if (drag_dest_delegate_)
1534     drag_dest_delegate_->OnDragOver();
1535
1536   return ConvertFromWeb(current_drag_op_);
1537 }
1538
1539 void WebContentsViewAura::OnDragExited() {
1540   DCHECK(current_rvh_for_drag_);
1541   if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1542     return;
1543
1544   if (!current_drop_data_)
1545     return;
1546
1547   web_contents_->GetRenderViewHost()->DragTargetDragLeave();
1548   if (drag_dest_delegate_)
1549     drag_dest_delegate_->OnDragLeave();
1550
1551   current_drop_data_.reset();
1552 }
1553
1554 int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
1555   DCHECK(current_rvh_for_drag_);
1556   if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1557     OnDragEntered(event);
1558
1559   if (!current_drop_data_)
1560     return ui::DragDropTypes::DRAG_NONE;
1561
1562   web_contents_->GetRenderViewHost()->DragTargetDrop(
1563       event.location(),
1564       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
1565       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1566   if (drag_dest_delegate_)
1567     drag_dest_delegate_->OnDrop();
1568   current_drop_data_.reset();
1569   return ConvertFromWeb(current_drag_op_);
1570 }
1571
1572 void WebContentsViewAura::OnWindowParentChanged(aura::Window* window,
1573                                                 aura::Window* parent) {
1574   // Ignore any visibility changes in the hierarchy below.
1575   if (window != window_.get() && window_->Contains(window))
1576     return;
1577
1578   // On Windows we will get called with a parent of NULL as part of the shut
1579   // down process. As such we do only change the visibility when a parent gets
1580   // set.
1581   if (parent)
1582     UpdateWebContentsVisibility(window->IsVisible());
1583 }
1584
1585 void WebContentsViewAura::OnWindowVisibilityChanged(aura::Window* window,
1586                                                     bool visible) {
1587   // Ignore any visibility changes in the hierarchy below.
1588   if (window != window_.get() && window_->Contains(window))
1589     return;
1590
1591   UpdateWebContentsVisibility(visible);
1592 }
1593
1594 void WebContentsViewAura::UpdateWebContentsVisibility(bool visible) {
1595   if (!is_or_was_visible_) {
1596     // We should not hide the web contents before it was shown the first time,
1597     // since resources would immediately be destroyed and only re-created after
1598     // content got loaded. In this state the window content is undefined and can
1599     // show garbage.
1600     // However - the page load mechanism requires an activation call through a
1601     // visibility call to (re)load.
1602     if (visible) {
1603       is_or_was_visible_ = true;
1604       web_contents_->WasShown();
1605     }
1606     return;
1607   }
1608   if (visible) {
1609     if (!web_contents_->should_normally_be_visible())
1610       web_contents_->WasShown();
1611   } else {
1612     if (web_contents_->should_normally_be_visible())
1613       web_contents_->WasHidden();
1614   }
1615 }
1616
1617 }  // namespace content