web_contents_view_aura.cc revision 116680a4aac90f2aa7413d9095a592090648e557 
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
73namespace content {
74WebContentsView* 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
83namespace {
84
85bool IsScrollEndEffectEnabled() {
86  return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
87      switches::kScrollEndEffect) == "1";
88}
89
90bool ShouldNavigateForward(const NavigationController& controller,
91                           OverscrollMode mode) {
92  return mode == (base::i18n::IsRTL() ? OVERSCROLL_EAST : OVERSCROLL_WEST) &&
93         controller.CanGoForward();
94}
95
96bool ShouldNavigateBack(const NavigationController& controller,
97                        OverscrollMode mode) {
98  return mode == (base::i18n::IsRTL() ? OVERSCROLL_WEST : OVERSCROLL_EAST) &&
99         controller.CanGoBack();
100}
101
102RenderWidgetHostViewAura* 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.
118class 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.
179class 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.
222void 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)
239void 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.
300const 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.
309void 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.
320bool 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.
348void 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.
391void 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.
431int 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
442blink::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
453int 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
468class 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
723WebContentsViewAura::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
741WebContentsViewAura::~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
753void WebContentsViewAura::SetTouchEditableForTest(
754    TouchEditableImplAura* touch_editable) {
755  touch_editable_.reset(touch_editable);
756  AttachTouchEditableToRenderView();
757}
758
759void 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
768void 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
782void 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
802void 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
850void 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
858void 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
881void 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
912aura::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
921gfx::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
938void 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
950void 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
970void WebContentsViewAura::AttachTouchEditableToRenderView() {
971  if (!touch_editable_)
972    return;
973  RenderWidgetHostViewAura* rwhva = ToRenderWidgetHostViewAura(
974      web_contents_->GetRenderWidgetHostView());
975  touch_editable_->AttachToView(rwhva);
976}
977
978void 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
986gfx::NativeView WebContentsViewAura::GetNativeView() const {
987  return window_.get();
988}
989
990gfx::NativeView WebContentsViewAura::GetContentNativeView() const {
991  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
992  return rwhv ? rwhv->GetNativeView() : NULL;
993}
994
995gfx::NativeWindow WebContentsViewAura::GetTopLevelNativeWindow() const {
996  return window_->GetToplevelWindow();
997}
998
999void WebContentsViewAura::GetContainerBounds(gfx::Rect *out) const {
1000  *out = window_->GetBoundsInScreen();
1001}
1002
1003void 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
1015void 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
1029void WebContentsViewAura::SetInitialFocus() {
1030  if (web_contents_->FocusLocationBarByDefault())
1031    web_contents_->SetFocusToLocationBar(false);
1032  else
1033    Focus();
1034}
1035
1036void WebContentsViewAura::StoreFocus() {
1037  if (delegate_)
1038    delegate_->StoreFocus();
1039}
1040
1041void WebContentsViewAura::RestoreFocus() {
1042  if (delegate_)
1043    delegate_->RestoreFocus();
1044}
1045
1046DropData* WebContentsViewAura::GetDropData() const {
1047  return current_drop_data_.get();
1048}
1049
1050gfx::Rect WebContentsViewAura::GetViewBounds() const {
1051  return window_->GetBoundsInScreen();
1052}
1053
1054////////////////////////////////////////////////////////////////////////////////
1055// WebContentsViewAura, WebContentsView implementation:
1056
1057void 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
1103RenderWidgetHostViewBase* 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
1144RenderWidgetHostViewBase* WebContentsViewAura::CreateViewForPopupWidget(
1145    RenderWidgetHost* render_widget_host) {
1146  return new RenderWidgetHostViewAura(render_widget_host);
1147}
1148
1149void WebContentsViewAura::SetPageTitle(const base::string16& title) {
1150  window_->SetTitle(title);
1151}
1152
1153void WebContentsViewAura::RenderViewCreated(RenderViewHost* host) {
1154}
1155
1156void WebContentsViewAura::RenderViewSwappedIn(RenderViewHost* host) {
1157  if (navigation_overlay_.get() && navigation_overlay_->has_window())
1158    navigation_overlay_->StartObserving();
1159  AttachTouchEditableToRenderView();
1160}
1161
1162void 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
1180void 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
1191void 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
1247void WebContentsViewAura::UpdateDragCursor(blink::WebDragOperation operation) {
1248  current_drag_op_ = operation;
1249}
1250
1251void WebContentsViewAura::GotFocus() {
1252  if (web_contents_->GetDelegate())
1253    web_contents_->GetDelegate()->WebContentsFocused(web_contents_);
1254}
1255
1256void 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
1267gfx::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
1275void 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
1294void 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
1307void 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
1344void 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
1373gfx::Size WebContentsViewAura::GetMinimumSize() const {
1374  return gfx::Size();
1375}
1376
1377gfx::Size WebContentsViewAura::GetMaximumSize() const {
1378  return gfx::Size();
1379}
1380
1381void 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
1400gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {
1401  return gfx::kNullCursor;
1402}
1403
1404int WebContentsViewAura::GetNonClientComponent(const gfx::Point& point) const {
1405  return HTCLIENT;
1406}
1407
1408bool WebContentsViewAura::ShouldDescendIntoChildForEventHandling(
1409    aura::Window* child,
1410    const gfx::Point& location) {
1411  return true;
1412}
1413
1414bool 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
1426void WebContentsViewAura::OnCaptureLost() {
1427}
1428
1429void WebContentsViewAura::OnPaint(gfx::Canvas* canvas) {
1430}
1431
1432void WebContentsViewAura::OnDeviceScaleFactorChanged(
1433    float device_scale_factor) {
1434}
1435
1436void 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
1446void WebContentsViewAura::OnWindowDestroyed(aura::Window* window) {
1447}
1448
1449void WebContentsViewAura::OnWindowTargetVisibilityChanged(bool visible) {
1450}
1451
1452bool WebContentsViewAura::HasHitTestMask() const {
1453  return false;
1454}
1455
1456void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
1457}
1458
1459////////////////////////////////////////////////////////////////////////////////
1460// WebContentsViewAura, ui::EventHandler implementation:
1461
1462void WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
1463}
1464
1465void 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
1488void 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() &&
1497      !web_contents_->GetDelegate()->CanDragEnter(
1498          web_contents_, *current_drop_data_.get(), 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
1518int 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
1539void 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
1554int 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
1572void 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
1585void 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
1594void 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
1618