web_contents_view_aura.cc revision c5cede9ae108bb15f6b7a8aea21c7e1fefa2834c 
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/download/drag_download_util.h"
13#include "content/browser/frame_host/interstitial_page_impl.h"
14#include "content/browser/frame_host/navigation_entry_impl.h"
15#include "content/browser/renderer_host/dip_util.h"
16#include "content/browser/renderer_host/overscroll_controller.h"
17#include "content/browser/renderer_host/render_view_host_factory.h"
18#include "content/browser/renderer_host/render_view_host_impl.h"
19#include "content/browser/renderer_host/render_widget_host_impl.h"
20#include "content/browser/renderer_host/render_widget_host_view_aura.h"
21#include "content/browser/web_contents/aura/gesture_nav_simple.h"
22#include "content/browser/web_contents/aura/image_window_delegate.h"
23#include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
24#include "content/browser/web_contents/aura/shadow_layer_delegate.h"
25#include "content/browser/web_contents/aura/window_slider.h"
26#include "content/browser/web_contents/touch_editable_impl_aura.h"
27#include "content/browser/web_contents/web_contents_impl.h"
28#include "content/public/browser/content_browser_client.h"
29#include "content/public/browser/notification_observer.h"
30#include "content/public/browser/notification_registrar.h"
31#include "content/public/browser/notification_source.h"
32#include "content/public/browser/notification_types.h"
33#include "content/public/browser/overscroll_configuration.h"
34#include "content/public/browser/render_view_host.h"
35#include "content/public/browser/render_widget_host.h"
36#include "content/public/browser/render_widget_host_view.h"
37#include "content/public/browser/web_contents_delegate.h"
38#include "content/public/browser/web_contents_observer.h"
39#include "content/public/browser/web_contents_view_delegate.h"
40#include "content/public/browser/web_drag_dest_delegate.h"
41#include "content/public/common/content_client.h"
42#include "content/public/common/content_switches.h"
43#include "content/public/common/drop_data.h"
44#include "net/base/filename_util.h"
45#include "third_party/WebKit/public/web/WebInputEvent.h"
46#include "ui/aura/client/aura_constants.h"
47#include "ui/aura/client/window_tree_client.h"
48#include "ui/aura/env.h"
49#include "ui/aura/window.h"
50#include "ui/aura/window_observer.h"
51#include "ui/aura/window_tree_host.h"
52#include "ui/aura/window_tree_host_observer.h"
53#include "ui/base/clipboard/clipboard.h"
54#include "ui/base/clipboard/custom_data_helper.h"
55#include "ui/base/dragdrop/drag_drop_types.h"
56#include "ui/base/dragdrop/drag_utils.h"
57#include "ui/base/dragdrop/drop_target_event.h"
58#include "ui/base/dragdrop/os_exchange_data.h"
59#include "ui/base/hit_test.h"
60#include "ui/compositor/layer.h"
61#include "ui/compositor/scoped_layer_animation_settings.h"
62#include "ui/events/event.h"
63#include "ui/events/event_utils.h"
64#include "ui/gfx/canvas.h"
65#include "ui/gfx/image/image.h"
66#include "ui/gfx/image/image_png_rep.h"
67#include "ui/gfx/image/image_skia.h"
68#include "ui/gfx/screen.h"
69#include "ui/wm/public/drag_drop_client.h"
70#include "ui/wm/public/drag_drop_delegate.h"
71
72namespace content {
73WebContentsViewPort* CreateWebContentsView(
74    WebContentsImpl* web_contents,
75    WebContentsViewDelegate* delegate,
76    RenderViewHostDelegateView** render_view_host_delegate_view) {
77  WebContentsViewAura* rv = new WebContentsViewAura(web_contents, delegate);
78  *render_view_host_delegate_view = rv;
79  return rv;
80}
81
82namespace {
83
84bool IsScrollEndEffectEnabled() {
85  return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
86      switches::kScrollEndEffect) == "1";
87}
88
89bool ShouldNavigateForward(const NavigationController& controller,
90                           OverscrollMode mode) {
91  return mode == (base::i18n::IsRTL() ? OVERSCROLL_EAST : OVERSCROLL_WEST) &&
92         controller.CanGoForward();
93}
94
95bool ShouldNavigateBack(const NavigationController& controller,
96                        OverscrollMode mode) {
97  return mode == (base::i18n::IsRTL() ? OVERSCROLL_WEST : OVERSCROLL_EAST) &&
98         controller.CanGoBack();
99}
100
101RenderWidgetHostViewAura* ToRenderWidgetHostViewAura(
102    RenderWidgetHostView* view) {
103  if (!view || RenderViewHostFactory::has_factory())
104    return NULL;  // Can't cast to RenderWidgetHostViewAura in unit tests.
105  RenderProcessHostImpl* process = static_cast<RenderProcessHostImpl*>(
106      view->GetRenderWidgetHost()->GetProcess());
107  if (process->IsGuest())
108    return NULL;
109  return static_cast<RenderWidgetHostViewAura*>(view);
110}
111
112// The window delegate for the overscroll window. This redirects trackpad events
113// to the web-contents window. The delegate destroys itself when the window is
114// destroyed.
115class OverscrollWindowDelegate : public ImageWindowDelegate {
116 public:
117  OverscrollWindowDelegate(WebContentsImpl* web_contents,
118                           OverscrollMode overscroll_mode)
119      : web_contents_(web_contents),
120        forward_events_(true) {
121    const NavigationControllerImpl& controller = web_contents->GetController();
122    const NavigationEntryImpl* entry = NULL;
123    if (ShouldNavigateForward(controller, overscroll_mode)) {
124      entry = NavigationEntryImpl::FromNavigationEntry(
125          controller.GetEntryAtOffset(1));
126    } else if (ShouldNavigateBack(controller, overscroll_mode)) {
127      entry = NavigationEntryImpl::FromNavigationEntry(
128          controller.GetEntryAtOffset(-1));
129    }
130
131    gfx::Image image;
132    if (entry && entry->screenshot().get()) {
133      std::vector<gfx::ImagePNGRep> image_reps;
134      image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(),
135          ui::GetImageScale(
136              ui::GetScaleFactorForNativeView(web_contents_window()))));
137      image = gfx::Image(image_reps);
138    }
139    SetImage(image);
140  }
141
142  void stop_forwarding_events() { forward_events_ = false; }
143
144 private:
145  virtual ~OverscrollWindowDelegate() {}
146
147  aura::Window* web_contents_window() {
148    return web_contents_->GetView()->GetContentNativeView();
149  }
150
151  // Overridden from ui::EventHandler.
152  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE {
153    if (forward_events_ && web_contents_window())
154      web_contents_window()->delegate()->OnScrollEvent(event);
155  }
156
157  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
158    if (forward_events_ && web_contents_window())
159      web_contents_window()->delegate()->OnGestureEvent(event);
160  }
161
162  WebContents* web_contents_;
163
164  // The window is displayed both during the gesture, and after the gesture
165  // while the navigation is in progress. During the gesture, it is necessary to
166  // forward input events to the content page (e.g. when the overscroll window
167  // slides under the cursor and starts receiving scroll events). However, once
168  // the gesture is complete, and the window is being displayed as an overlay
169  // window during navigation, events should not be forwarded anymore.
170  bool forward_events_;
171
172  DISALLOW_COPY_AND_ASSIGN(OverscrollWindowDelegate);
173};
174
175// Listens to all mouse drag events during a drag and drop and sends them to
176// the renderer.
177class WebDragSourceAura : public NotificationObserver {
178 public:
179  WebDragSourceAura(aura::Window* window, WebContentsImpl* contents)
180      : window_(window),
181        contents_(contents) {
182    registrar_.Add(this,
183                   NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
184                   Source<WebContents>(contents));
185  }
186
187  virtual ~WebDragSourceAura() {
188  }
189
190  // NotificationObserver:
191  virtual void Observe(int type,
192      const NotificationSource& source,
193      const NotificationDetails& details) OVERRIDE {
194    if (type != NOTIFICATION_WEB_CONTENTS_DISCONNECTED)
195      return;
196
197    // Cancel the drag if it is still in progress.
198    aura::client::DragDropClient* dnd_client =
199        aura::client::GetDragDropClient(window_->GetRootWindow());
200    if (dnd_client && dnd_client->IsDragDropInProgress())
201      dnd_client->DragCancel();
202
203    window_ = NULL;
204    contents_ = NULL;
205  }
206
207  aura::Window* window() const { return window_; }
208
209 private:
210  aura::Window* window_;
211  WebContentsImpl* contents_;
212  NotificationRegistrar registrar_;
213
214  DISALLOW_COPY_AND_ASSIGN(WebDragSourceAura);
215};
216
217#if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
218// Fill out the OSExchangeData with a file contents, synthesizing a name if
219// necessary.
220void PrepareDragForFileContents(const DropData& drop_data,
221                                ui::OSExchangeData::Provider* provider) {
222  base::FilePath file_name =
223      base::FilePath::FromUTF16Unsafe(drop_data.file_description_filename);
224  // Images without ALT text will only have a file extension so we need to
225  // synthesize one from the provided extension and URL.
226  if (file_name.BaseName().RemoveExtension().empty()) {
227    const base::FilePath::StringType extension = file_name.Extension();
228    // Retrieve the name from the URL.
229    file_name = net::GenerateFileName(drop_data.url, "", "", "", "", "")
230                    .ReplaceExtension(extension);
231  }
232  provider->SetFileContents(file_name, drop_data.file_contents);
233}
234#endif
235
236#if defined(OS_WIN)
237void PrepareDragForDownload(
238    const DropData& drop_data,
239    ui::OSExchangeData::Provider* provider,
240    WebContentsImpl* web_contents) {
241  const GURL& page_url = web_contents->GetLastCommittedURL();
242  const std::string& page_encoding = web_contents->GetEncoding();
243
244  // Parse the download metadata.
245  base::string16 mime_type;
246  base::FilePath file_name;
247  GURL download_url;
248  if (!ParseDownloadMetadata(drop_data.download_metadata,
249                             &mime_type,
250                             &file_name,
251                             &download_url))
252    return;
253
254  // Generate the file name based on both mime type and proposed file name.
255  std::string default_name =
256      GetContentClient()->browser()->GetDefaultDownloadName();
257  base::FilePath generated_download_file_name =
258      net::GenerateFileName(download_url,
259                            std::string(),
260                            std::string(),
261                            base::UTF16ToUTF8(file_name.value()),
262                            base::UTF16ToUTF8(mime_type),
263                            default_name);
264
265  // http://crbug.com/332579
266  base::ThreadRestrictions::ScopedAllowIO allow_file_operations;
267
268  base::FilePath temp_dir_path;
269  if (!base::CreateNewTempDirectory(FILE_PATH_LITERAL("chrome_drag"),
270                                    &temp_dir_path))
271    return;
272
273  base::FilePath download_path =
274      temp_dir_path.Append(generated_download_file_name);
275
276  // We cannot know when the target application will be done using the temporary
277  // file, so schedule it to be deleted after rebooting.
278  base::DeleteFileAfterReboot(download_path);
279  base::DeleteFileAfterReboot(temp_dir_path);
280
281  // Provide the data as file (CF_HDROP). A temporary download file with the
282  // Zone.Identifier ADS (Alternate Data Stream) attached will be created.
283  scoped_refptr<DragDownloadFile> download_file =
284      new DragDownloadFile(
285          download_path,
286          base::File(),
287          download_url,
288          Referrer(page_url, drop_data.referrer_policy),
289          page_encoding,
290          web_contents);
291  ui::OSExchangeData::DownloadFileInfo file_download(base::FilePath(),
292                                                     download_file.get());
293  provider->SetDownloadFileInfo(file_download);
294}
295#endif  // defined(OS_WIN)
296
297// Utility to fill a ui::OSExchangeDataProvider object from DropData.
298void PrepareDragData(const DropData& drop_data,
299                     ui::OSExchangeData::Provider* provider,
300                     WebContentsImpl* web_contents) {
301  provider->MarkOriginatedFromRenderer();
302#if defined(OS_WIN)
303  // Put download before file contents to prefer the download of a image over
304  // its thumbnail link.
305  if (!drop_data.download_metadata.empty())
306    PrepareDragForDownload(drop_data, provider, web_contents);
307#endif
308#if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
309  // We set the file contents before the URL because the URL also sets file
310  // contents (to a .URL shortcut).  We want to prefer file content data over
311  // a shortcut so we add it first.
312  if (!drop_data.file_contents.empty())
313    PrepareDragForFileContents(drop_data, provider);
314#endif
315  if (!drop_data.text.string().empty())
316    provider->SetString(drop_data.text.string());
317  if (drop_data.url.is_valid())
318    provider->SetURL(drop_data.url, drop_data.url_title);
319  if (!drop_data.html.string().empty())
320    provider->SetHtml(drop_data.html.string(), drop_data.html_base_url);
321  if (!drop_data.filenames.empty())
322    provider->SetFilenames(drop_data.filenames);
323  if (!drop_data.custom_data.empty()) {
324    Pickle pickle;
325    ui::WriteCustomDataToPickle(drop_data.custom_data, &pickle);
326    provider->SetPickledData(ui::Clipboard::GetWebCustomDataFormatType(),
327                             pickle);
328  }
329}
330
331// Utility to fill a DropData object from ui::OSExchangeData.
332void PrepareDropData(DropData* drop_data, const ui::OSExchangeData& data) {
333  drop_data->did_originate_from_renderer = data.DidOriginateFromRenderer();
334
335  base::string16 plain_text;
336  data.GetString(&plain_text);
337  if (!plain_text.empty())
338    drop_data->text = base::NullableString16(plain_text, false);
339
340  GURL url;
341  base::string16 url_title;
342  data.GetURLAndTitle(
343      ui::OSExchangeData::DO_NOT_CONVERT_FILENAMES, &url, &url_title);
344  if (url.is_valid()) {
345    drop_data->url = url;
346    drop_data->url_title = url_title;
347  }
348
349  base::string16 html;
350  GURL html_base_url;
351  data.GetHtml(&html, &html_base_url);
352  if (!html.empty())
353    drop_data->html = base::NullableString16(html, false);
354  if (html_base_url.is_valid())
355    drop_data->html_base_url = html_base_url;
356
357  data.GetFilenames(&drop_data->filenames);
358
359  Pickle pickle;
360  if (data.GetPickledData(ui::Clipboard::GetWebCustomDataFormatType(), &pickle))
361    ui::ReadCustomDataIntoMap(
362        pickle.data(), pickle.size(), &drop_data->custom_data);
363}
364
365// Utilities to convert between blink::WebDragOperationsMask and
366// ui::DragDropTypes.
367int ConvertFromWeb(blink::WebDragOperationsMask ops) {
368  int drag_op = ui::DragDropTypes::DRAG_NONE;
369  if (ops & blink::WebDragOperationCopy)
370    drag_op |= ui::DragDropTypes::DRAG_COPY;
371  if (ops & blink::WebDragOperationMove)
372    drag_op |= ui::DragDropTypes::DRAG_MOVE;
373  if (ops & blink::WebDragOperationLink)
374    drag_op |= ui::DragDropTypes::DRAG_LINK;
375  return drag_op;
376}
377
378blink::WebDragOperationsMask ConvertToWeb(int drag_op) {
379  int web_drag_op = blink::WebDragOperationNone;
380  if (drag_op & ui::DragDropTypes::DRAG_COPY)
381    web_drag_op |= blink::WebDragOperationCopy;
382  if (drag_op & ui::DragDropTypes::DRAG_MOVE)
383    web_drag_op |= blink::WebDragOperationMove;
384  if (drag_op & ui::DragDropTypes::DRAG_LINK)
385    web_drag_op |= blink::WebDragOperationLink;
386  return (blink::WebDragOperationsMask) web_drag_op;
387}
388
389int ConvertAuraEventFlagsToWebInputEventModifiers(int aura_event_flags) {
390  int web_input_event_modifiers = 0;
391  if (aura_event_flags & ui::EF_SHIFT_DOWN)
392    web_input_event_modifiers |= blink::WebInputEvent::ShiftKey;
393  if (aura_event_flags & ui::EF_CONTROL_DOWN)
394    web_input_event_modifiers |= blink::WebInputEvent::ControlKey;
395  if (aura_event_flags & ui::EF_ALT_DOWN)
396    web_input_event_modifiers |= blink::WebInputEvent::AltKey;
397  if (aura_event_flags & ui::EF_COMMAND_DOWN)
398    web_input_event_modifiers |= blink::WebInputEvent::MetaKey;
399  return web_input_event_modifiers;
400}
401
402}  // namespace
403
404class WebContentsViewAura::WindowObserver
405    : public aura::WindowObserver, public aura::WindowTreeHostObserver {
406 public:
407  explicit WindowObserver(WebContentsViewAura* view)
408      : view_(view),
409        parent_(NULL) {
410    view_->window_->AddObserver(this);
411
412#if defined(OS_WIN)
413    if (view_->window_->GetRootWindow())
414      view_->window_->GetRootWindow()->AddObserver(this);
415#endif
416  }
417
418  virtual ~WindowObserver() {
419    view_->window_->RemoveObserver(this);
420    if (view_->window_->GetHost())
421      view_->window_->GetHost()->RemoveObserver(this);
422    if (parent_)
423      parent_->RemoveObserver(this);
424
425#if defined(OS_WIN)
426    if (parent_) {
427      const aura::Window::Windows& children = parent_->children();
428      for (size_t i = 0; i < children.size(); ++i)
429        children[i]->RemoveObserver(this);
430    }
431
432    aura::Window* root_window = view_->window_->GetRootWindow();
433    if (root_window) {
434      root_window->RemoveObserver(this);
435      const aura::Window::Windows& root_children = root_window->children();
436      for (size_t i = 0; i < root_children.size(); ++i)
437        root_children[i]->RemoveObserver(this);
438    }
439#endif
440  }
441
442  // Overridden from aura::WindowObserver:
443#if defined(OS_WIN)
444  // Constrained windows are added as children of the parent's parent's view
445  // which may overlap with windowed NPAPI plugins. In that case, tell the RWHV
446  // so that it can update the plugins' cutout rects accordingly.
447  // Note: this is hard coding how Chrome layer adds its dialogs. Since NPAPI is
448  // going to be deprecated in a year, this is ok for now. The test for this is
449  // PrintPreviewTest.WindowedNPAPIPluginHidden.
450  virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE {
451    if (new_window != view_->window_) {
452      // Skip the case when the parent moves to the root window.
453      if (new_window != parent_) {
454        // Observe sibling windows of the WebContents, or children of the root
455        // window.
456        if (new_window->parent() == parent_ ||
457            new_window->parent() == view_->window_->GetRootWindow()) {
458          new_window->AddObserver(this);
459        }
460      }
461    }
462
463    if (new_window->parent() == parent_) {
464      UpdateConstrainedWindows(NULL);
465    }
466  }
467
468  virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE {
469    if (window == view_->window_)
470      return;
471
472    window->RemoveObserver(this);
473    UpdateConstrainedWindows(window);
474  }
475
476  virtual void OnWindowVisibilityChanged(aura::Window* window,
477                                         bool visible) OVERRIDE {
478    if (window == view_->window_ ||
479        window->parent() == parent_ ||
480        window->parent() == view_->window_->GetRootWindow()) {
481      UpdateConstrainedWindows(NULL);
482    }
483  }
484#endif
485
486  virtual void OnWindowParentChanged(aura::Window* window,
487                                     aura::Window* parent) OVERRIDE {
488    if (window != view_->window_)
489      return;
490    if (parent_)
491      parent_->RemoveObserver(this);
492
493#if defined(OS_WIN)
494    if (parent_) {
495      const aura::Window::Windows& children = parent_->children();
496      for (size_t i = 0; i < children.size(); ++i)
497        children[i]->RemoveObserver(this);
498
499      RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
500          view_->web_contents_->GetRenderWidgetHostView());
501      if (view)
502        view->UpdateConstrainedWindowRects(std::vector<gfx::Rect>());
503    }
504
505    // When we get parented to the root window, the code below will watch the
506    // parent, aka root window. Since we already watch the root window on
507    // Windows, unregister first so that the debug check doesn't fire.
508    if (parent && parent == window->GetRootWindow())
509      parent->RemoveObserver(this);
510
511    // We need to undo the above if we were parented to the root window and then
512    // got parented to another window. At that point, the code before the ifdef
513    // would have stopped watching the root window.
514    if (window->GetRootWindow() &&
515        parent != window->GetRootWindow() &&
516        !window->GetRootWindow()->HasObserver(this)) {
517      window->GetRootWindow()->AddObserver(this);
518    }
519#endif
520
521    parent_ = parent;
522    if (parent) {
523      parent->AddObserver(this);
524#if defined(OS_WIN)
525      if (parent != window->GetRootWindow()) {
526        const aura::Window::Windows& children = parent->children();
527        for (size_t i = 0; i < children.size(); ++i) {
528          if (children[i] != view_->window_)
529            children[i]->AddObserver(this);
530        }
531      }
532#endif
533    }
534  }
535
536  virtual void OnWindowBoundsChanged(aura::Window* window,
537                                     const gfx::Rect& old_bounds,
538                                     const gfx::Rect& new_bounds) OVERRIDE {
539    if (window == parent_ || window == view_->window_) {
540      SendScreenRects();
541      if (view_->touch_editable_)
542        view_->touch_editable_->UpdateEditingController();
543#if defined(OS_WIN)
544    } else {
545      UpdateConstrainedWindows(NULL);
546#endif
547    }
548  }
549
550  virtual void OnWindowAddedToRootWindow(aura::Window* window) OVERRIDE {
551    if (window == view_->window_) {
552      window->GetHost()->AddObserver(this);
553#if defined(OS_WIN)
554      if (!window->GetRootWindow()->HasObserver(this))
555        window->GetRootWindow()->AddObserver(this);
556#endif
557    }
558  }
559
560  virtual void OnWindowRemovingFromRootWindow(aura::Window* window,
561                                              aura::Window* new_root) OVERRIDE {
562    if (window == view_->window_) {
563      window->GetHost()->RemoveObserver(this);
564#if defined(OS_WIN)
565      window->GetRootWindow()->RemoveObserver(this);
566
567      const aura::Window::Windows& root_children =
568          window->GetRootWindow()->children();
569      for (size_t i = 0; i < root_children.size(); ++i) {
570        if (root_children[i] != view_->window_ && root_children[i] != parent_)
571          root_children[i]->RemoveObserver(this);
572      }
573#endif
574    }
575  }
576
577  // Overridden WindowTreeHostObserver:
578  virtual void OnHostMoved(const aura::WindowTreeHost* host,
579                           const gfx::Point& new_origin) OVERRIDE {
580    TRACE_EVENT1("ui",
581                 "WebContentsViewAura::WindowObserver::OnHostMoved",
582                 "new_origin", new_origin.ToString());
583
584    // This is for the desktop case (i.e. Aura desktop).
585    SendScreenRects();
586  }
587
588 private:
589  void SendScreenRects() {
590    RenderWidgetHostImpl::From(view_->web_contents_->GetRenderViewHost())->
591        SendScreenRects();
592  }
593
594#if defined(OS_WIN)
595  void UpdateConstrainedWindows(aura::Window* exclude) {
596    RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
597        view_->web_contents_->GetRenderWidgetHostView());
598    if (!view)
599      return;
600
601    std::vector<gfx::Rect> constrained_windows;
602    if (parent_) {
603      const aura::Window::Windows& children = parent_->children();
604      for (size_t i = 0; i < children.size(); ++i) {
605        if (children[i] != view_->window_ &&
606            children[i] != exclude &&
607            children[i]->IsVisible()) {
608          constrained_windows.push_back(children[i]->GetBoundsInRootWindow());
609        }
610      }
611    }
612
613    aura::Window* root_window = view_->window_->GetRootWindow();
614    const aura::Window::Windows& root_children = root_window->children();
615    if (root_window) {
616      for (size_t i = 0; i < root_children.size(); ++i) {
617        if (root_children[i]->IsVisible() &&
618            !root_children[i]->Contains(view_->window_.get())) {
619          constrained_windows.push_back(
620              root_children[i]->GetBoundsInRootWindow());
621        }
622      }
623    }
624
625    view->UpdateConstrainedWindowRects(constrained_windows);
626  }
627#endif
628
629  WebContentsViewAura* view_;
630
631  // We cache the old parent so that we can unregister when it's not the parent
632  // anymore.
633  aura::Window* parent_;
634
635  DISALLOW_COPY_AND_ASSIGN(WindowObserver);
636};
637
638////////////////////////////////////////////////////////////////////////////////
639// WebContentsViewAura, public:
640
641WebContentsViewAura::WebContentsViewAura(
642    WebContentsImpl* web_contents,
643    WebContentsViewDelegate* delegate)
644    : web_contents_(web_contents),
645      delegate_(delegate),
646      current_drag_op_(blink::WebDragOperationNone),
647      drag_dest_delegate_(NULL),
648      current_rvh_for_drag_(NULL),
649      overscroll_change_brightness_(false),
650      current_overscroll_gesture_(OVERSCROLL_NONE),
651      completed_overscroll_gesture_(OVERSCROLL_NONE),
652      touch_editable_(TouchEditableImplAura::Create()) {
653}
654
655////////////////////////////////////////////////////////////////////////////////
656// WebContentsViewAura, private:
657
658WebContentsViewAura::~WebContentsViewAura() {
659  if (!window_)
660    return;
661
662  window_observer_.reset();
663
664  // Window needs a valid delegate during its destructor, so we explicitly
665  // delete it here.
666  window_.reset();
667}
668
669void WebContentsViewAura::SetupOverlayWindowForTesting() {
670  if (navigation_overlay_)
671    navigation_overlay_->SetupForTesting();
672}
673
674void WebContentsViewAura::SetTouchEditableForTest(
675    TouchEditableImplAura* touch_editable) {
676  touch_editable_.reset(touch_editable);
677  AttachTouchEditableToRenderView();
678}
679
680void WebContentsViewAura::SizeChangedCommon(const gfx::Size& size) {
681  if (web_contents_->GetInterstitialPage())
682    web_contents_->GetInterstitialPage()->SetSize(size);
683  RenderWidgetHostView* rwhv =
684      web_contents_->GetRenderWidgetHostView();
685  if (rwhv)
686    rwhv->SetSize(size);
687}
688
689void WebContentsViewAura::EndDrag(blink::WebDragOperationsMask ops) {
690  aura::Window* root_window = GetNativeView()->GetRootWindow();
691  gfx::Point screen_loc =
692      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
693  gfx::Point client_loc = screen_loc;
694  RenderViewHost* rvh = web_contents_->GetRenderViewHost();
695  aura::Window* window = rvh->GetView()->GetNativeView();
696  aura::Window::ConvertPointToTarget(root_window, window, &client_loc);
697  if (!web_contents_)
698    return;
699  web_contents_->DragSourceEndedAt(client_loc.x(), client_loc.y(),
700      screen_loc.x(), screen_loc.y(), ops);
701}
702
703void WebContentsViewAura::InstallOverscrollControllerDelegate(
704    RenderWidgetHostImpl* host) {
705  const std::string value = CommandLine::ForCurrentProcess()->
706      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation);
707  if (value == "0") {
708    navigation_overlay_.reset();
709    return;
710  }
711  if (value == "2") {
712    navigation_overlay_.reset();
713    if (!gesture_nav_simple_)
714      gesture_nav_simple_.reset(new GestureNavSimple(web_contents_));
715    host->overscroll_controller()->set_delegate(gesture_nav_simple_.get());
716    return;
717  }
718  host->overscroll_controller()->set_delegate(this);
719  if (!navigation_overlay_)
720    navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
721}
722
723void WebContentsViewAura::PrepareOverscrollWindow() {
724  // If there is an existing |overscroll_window_| which is in the middle of an
725  // animation, then destroying the window here causes the animation to be
726  // completed immidiately, which triggers |OnImplicitAnimationsCompleted()|
727  // callback, and that tries to reset |overscroll_window_| again, causing a
728  // double-free. So use a temporary variable here.
729  if (overscroll_window_) {
730    base::AutoReset<OverscrollMode> reset_state(&current_overscroll_gesture_,
731                                                current_overscroll_gesture_);
732    scoped_ptr<aura::Window> reset_window(overscroll_window_.release());
733  }
734
735  OverscrollWindowDelegate* overscroll_delegate = new OverscrollWindowDelegate(
736      web_contents_,
737      current_overscroll_gesture_);
738  overscroll_window_.reset(new aura::Window(overscroll_delegate));
739  overscroll_window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
740  overscroll_window_->SetTransparent(true);
741  overscroll_window_->Init(aura::WINDOW_LAYER_TEXTURED);
742  overscroll_window_->layer()->SetMasksToBounds(false);
743  overscroll_window_->SetName("OverscrollOverlay");
744
745  overscroll_change_brightness_ = overscroll_delegate->has_image();
746  window_->AddChild(overscroll_window_.get());
747
748  gfx::Rect bounds = gfx::Rect(window_->bounds().size());
749  if (ShouldNavigateForward(web_contents_->GetController(),
750                            current_overscroll_gesture_)) {
751    // The overlay will be sliding in from the right edge towards the left in
752    // non-RTL, or sliding in from the left edge towards the right in RTL.
753    // So position the overlay window accordingly.
754    bounds.Offset(base::i18n::IsRTL() ? -bounds.width() : bounds.width(), 0);
755  }
756
757  aura::Window* animate_window = GetWindowToAnimateForOverscroll();
758  if (animate_window == overscroll_window_)
759    window_->StackChildAbove(overscroll_window_.get(), GetContentNativeView());
760  else
761    window_->StackChildBelow(overscroll_window_.get(), GetContentNativeView());
762
763  UpdateOverscrollWindowBrightness(0.f);
764
765  overscroll_window_->SetBounds(bounds);
766  overscroll_window_->Show();
767
768  overscroll_shadow_.reset(new ShadowLayerDelegate(animate_window->layer()));
769}
770
771void WebContentsViewAura::PrepareContentWindowForOverscroll() {
772  StopObservingImplicitAnimations();
773  aura::Window* content = GetContentNativeView();
774  content->layer()->GetAnimator()->AbortAllAnimations();
775  content->SetTransform(gfx::Transform());
776  content->layer()->SetLayerBrightness(0.f);
777}
778
779void WebContentsViewAura::ResetOverscrollTransform() {
780  if (!web_contents_->GetRenderWidgetHostView())
781    return;
782  aura::Window* target = GetWindowToAnimateForOverscroll();
783  if (!target)
784    return;
785  {
786    ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
787    settings.SetPreemptionStrategy(
788        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
789    settings.SetTweenType(gfx::Tween::EASE_OUT);
790    settings.AddObserver(this);
791    target->SetTransform(gfx::Transform());
792  }
793  {
794    ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
795    settings.SetPreemptionStrategy(
796        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
797    settings.SetTweenType(gfx::Tween::EASE_OUT);
798    UpdateOverscrollWindowBrightness(0.f);
799  }
800}
801
802void WebContentsViewAura::CompleteOverscrollNavigation(OverscrollMode mode) {
803  if (!web_contents_->GetRenderWidgetHostView())
804    return;
805
806  // Animate out the current view first. Navigate to the requested history at
807  // the end of the animation.
808  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
809    return;
810
811  UMA_HISTOGRAM_ENUMERATION("Overscroll.Navigated",
812                            current_overscroll_gesture_, OVERSCROLL_COUNT);
813  OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
814      overscroll_window_->delegate());
815  delegate->stop_forwarding_events();
816
817  completed_overscroll_gesture_ = mode;
818  aura::Window* target = GetWindowToAnimateForOverscroll();
819  ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
820  settings.SetPreemptionStrategy(
821      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
822  settings.SetTweenType(gfx::Tween::EASE_OUT);
823  settings.AddObserver(this);
824  gfx::Transform transform;
825  int content_width =
826      web_contents_->GetRenderWidgetHostView()->GetViewBounds().width();
827  int translate_x = mode == OVERSCROLL_WEST ? -content_width : content_width;
828  transform.Translate(translate_x, 0);
829  target->SetTransform(transform);
830  UpdateOverscrollWindowBrightness(translate_x);
831}
832
833aura::Window* WebContentsViewAura::GetWindowToAnimateForOverscroll() {
834  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
835    return NULL;
836
837  return ShouldNavigateForward(web_contents_->GetController(),
838                               current_overscroll_gesture_) ?
839      overscroll_window_.get() : GetContentNativeView();
840}
841
842gfx::Vector2d WebContentsViewAura::GetTranslationForOverscroll(int delta_x,
843                                                               int delta_y) {
844  if (current_overscroll_gesture_ == OVERSCROLL_NORTH ||
845      current_overscroll_gesture_ == OVERSCROLL_SOUTH) {
846    return gfx::Vector2d(0, delta_y);
847  }
848  // For horizontal overscroll, scroll freely if a navigation is possible. Do a
849  // resistive scroll otherwise.
850  const NavigationControllerImpl& controller = web_contents_->GetController();
851  const gfx::Rect& bounds = GetViewBounds();
852  if (ShouldNavigateForward(controller, current_overscroll_gesture_))
853    return gfx::Vector2d(std::max(-bounds.width(), delta_x), 0);
854  else if (ShouldNavigateBack(controller, current_overscroll_gesture_))
855    return gfx::Vector2d(std::min(bounds.width(), delta_x), 0);
856  return gfx::Vector2d();
857}
858
859void WebContentsViewAura::PrepareOverscrollNavigationOverlay() {
860  OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
861      overscroll_window_->delegate());
862  overscroll_window_->SchedulePaintInRect(
863      gfx::Rect(overscroll_window_->bounds().size()));
864  overscroll_window_->SetBounds(gfx::Rect(window_->bounds().size()));
865  overscroll_window_->SetTransform(gfx::Transform());
866  navigation_overlay_->SetOverlayWindow(overscroll_window_.Pass(),
867                                        delegate);
868  navigation_overlay_->StartObserving();
869}
870
871void WebContentsViewAura::UpdateOverscrollWindowBrightness(float delta_x) {
872  if (!overscroll_change_brightness_)
873    return;
874
875  const float kBrightnessMin = -.1f;
876  const float kBrightnessMax = -.01f;
877
878  float ratio = fabs(delta_x) / GetViewBounds().width();
879  ratio = std::min(1.f, ratio);
880  if (base::i18n::IsRTL())
881    ratio = 1.f - ratio;
882  float brightness = current_overscroll_gesture_ == OVERSCROLL_WEST ?
883      kBrightnessMin + ratio * (kBrightnessMax - kBrightnessMin) :
884      kBrightnessMax - ratio * (kBrightnessMax - kBrightnessMin);
885  brightness = std::max(kBrightnessMin, brightness);
886  brightness = std::min(kBrightnessMax, brightness);
887  aura::Window* window = GetWindowToAnimateForOverscroll();
888  window->layer()->SetLayerBrightness(brightness);
889}
890
891void WebContentsViewAura::AttachTouchEditableToRenderView() {
892  if (!touch_editable_)
893    return;
894  RenderWidgetHostViewAura* rwhva = ToRenderWidgetHostViewAura(
895      web_contents_->GetRenderWidgetHostView());
896  touch_editable_->AttachToView(rwhva);
897}
898
899void WebContentsViewAura::OverscrollUpdateForWebContentsDelegate(int delta_y) {
900  if (web_contents_->GetDelegate() && IsScrollEndEffectEnabled())
901    web_contents_->GetDelegate()->OverscrollUpdate(delta_y);
902}
903
904////////////////////////////////////////////////////////////////////////////////
905// WebContentsViewAura, WebContentsView implementation:
906
907gfx::NativeView WebContentsViewAura::GetNativeView() const {
908  return window_.get();
909}
910
911gfx::NativeView WebContentsViewAura::GetContentNativeView() const {
912  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
913  return rwhv ? rwhv->GetNativeView() : NULL;
914}
915
916gfx::NativeWindow WebContentsViewAura::GetTopLevelNativeWindow() const {
917  return window_->GetToplevelWindow();
918}
919
920void WebContentsViewAura::GetContainerBounds(gfx::Rect *out) const {
921  *out = window_->GetBoundsInScreen();
922}
923
924void WebContentsViewAura::OnTabCrashed(base::TerminationStatus status,
925                                       int error_code) {
926}
927
928void WebContentsViewAura::SizeContents(const gfx::Size& size) {
929  gfx::Rect bounds = window_->bounds();
930  if (bounds.size() != size) {
931    bounds.set_size(size);
932    window_->SetBounds(bounds);
933  } else {
934    // Our size matches what we want but the renderers size may not match.
935    // Pretend we were resized so that the renderers size is updated too.
936    SizeChangedCommon(size);
937  }
938}
939
940void WebContentsViewAura::Focus() {
941  if (web_contents_->GetInterstitialPage()) {
942    web_contents_->GetInterstitialPage()->Focus();
943    return;
944  }
945
946  if (delegate_.get() && delegate_->Focus())
947    return;
948
949  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
950  if (rwhv)
951    rwhv->Focus();
952}
953
954void WebContentsViewAura::SetInitialFocus() {
955  if (web_contents_->FocusLocationBarByDefault())
956    web_contents_->SetFocusToLocationBar(false);
957  else
958    Focus();
959}
960
961void WebContentsViewAura::StoreFocus() {
962  if (delegate_)
963    delegate_->StoreFocus();
964}
965
966void WebContentsViewAura::RestoreFocus() {
967  if (delegate_)
968    delegate_->RestoreFocus();
969}
970
971DropData* WebContentsViewAura::GetDropData() const {
972  return current_drop_data_.get();
973}
974
975gfx::Rect WebContentsViewAura::GetViewBounds() const {
976  return window_->GetBoundsInScreen();
977}
978
979////////////////////////////////////////////////////////////////////////////////
980// WebContentsViewAura, WebContentsViewPort implementation:
981
982void WebContentsViewAura::CreateView(
983    const gfx::Size& initial_size, gfx::NativeView context) {
984  // NOTE: we ignore |initial_size| since in some cases it's wrong (such as
985  // if the bookmark bar is not shown and you create a new tab). The right
986  // value is set shortly after this, so its safe to ignore.
987
988  aura::Env::CreateInstance();
989  window_.reset(new aura::Window(this));
990  window_->set_owned_by_parent(false);
991  window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
992  window_->SetTransparent(false);
993  window_->Init(aura::WINDOW_LAYER_NOT_DRAWN);
994  aura::Window* root_window = context ? context->GetRootWindow() : NULL;
995  if (root_window) {
996    // There are places where there is no context currently because object
997    // hierarchies are built before they're attached to a Widget. (See
998    // views::WebView as an example; GetWidget() returns NULL at the point
999    // where we are created.)
1000    //
1001    // It should be OK to not set a default parent since such users will
1002    // explicitly add this WebContentsViewAura to their tree after they create
1003    // us.
1004    if (root_window) {
1005      aura::client::ParentWindowWithContext(
1006          window_.get(), root_window, root_window->GetBoundsInScreen());
1007    }
1008  }
1009  window_->layer()->SetMasksToBounds(true);
1010  window_->SetName("WebContentsViewAura");
1011
1012  // WindowObserver is not interesting and is problematic for Browser Plugin
1013  // guests.
1014  // The use cases for WindowObserver do not apply to Browser Plugins:
1015  // 1) guests do not support NPAPI plugins.
1016  // 2) guests' window bounds are supposed to come from its embedder.
1017  if (!web_contents_->GetRenderProcessHost()->IsGuest())
1018    window_observer_.reset(new WindowObserver(this));
1019
1020  // delegate_->GetDragDestDelegate() creates a new delegate on every call.
1021  // Hence, we save a reference to it locally. Similar model is used on other
1022  // platforms as well.
1023  if (delegate_)
1024    drag_dest_delegate_ = delegate_->GetDragDestDelegate();
1025}
1026
1027RenderWidgetHostView* WebContentsViewAura::CreateViewForWidget(
1028    RenderWidgetHost* render_widget_host) {
1029  if (render_widget_host->GetView()) {
1030    // During testing, the view will already be set up in most cases to the
1031    // test view, so we don't want to clobber it with a real one. To verify that
1032    // this actually is happening (and somebody isn't accidentally creating the
1033    // view twice), we check for the RVH Factory, which will be set when we're
1034    // making special ones (which go along with the special views).
1035    DCHECK(RenderViewHostFactory::has_factory());
1036    return render_widget_host->GetView();
1037  }
1038
1039  RenderWidgetHostView* view =
1040      RenderWidgetHostView::CreateViewForWidget(render_widget_host);
1041  view->InitAsChild(NULL);
1042  GetNativeView()->AddChild(view->GetNativeView());
1043
1044  if (navigation_overlay_.get() && navigation_overlay_->has_window()) {
1045    navigation_overlay_->StartObserving();
1046  }
1047
1048  RenderWidgetHostImpl* host_impl =
1049      RenderWidgetHostImpl::From(render_widget_host);
1050
1051  if (!host_impl->is_hidden())
1052    view->Show();
1053
1054  // We listen to drag drop events in the newly created view's window.
1055  aura::client::SetDragDropDelegate(view->GetNativeView(), this);
1056
1057  if (host_impl->overscroll_controller() &&
1058      (!web_contents_->GetDelegate() ||
1059       web_contents_->GetDelegate()->CanOverscrollContent())) {
1060    InstallOverscrollControllerDelegate(host_impl);
1061  }
1062
1063  AttachTouchEditableToRenderView();
1064  return view;
1065}
1066
1067RenderWidgetHostView* WebContentsViewAura::CreateViewForPopupWidget(
1068    RenderWidgetHost* render_widget_host) {
1069  return RenderWidgetHostViewPort::CreateViewForWidget(render_widget_host);
1070}
1071
1072void WebContentsViewAura::SetPageTitle(const base::string16& title) {
1073  window_->set_title(title);
1074}
1075
1076void WebContentsViewAura::RenderViewCreated(RenderViewHost* host) {
1077}
1078
1079void WebContentsViewAura::RenderViewSwappedIn(RenderViewHost* host) {
1080  if (navigation_overlay_.get() && navigation_overlay_->has_window())
1081    navigation_overlay_->StartObserving();
1082  AttachTouchEditableToRenderView();
1083}
1084
1085void WebContentsViewAura::SetOverscrollControllerEnabled(bool enabled) {
1086  RenderViewHostImpl* host = static_cast<RenderViewHostImpl*>(
1087      web_contents_->GetRenderViewHost());
1088  if (host) {
1089    host->SetOverscrollControllerEnabled(enabled);
1090    if (enabled)
1091      InstallOverscrollControllerDelegate(host);
1092  }
1093
1094  if (!enabled)
1095    navigation_overlay_.reset();
1096  else if (!navigation_overlay_)
1097    navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
1098}
1099
1100////////////////////////////////////////////////////////////////////////////////
1101// WebContentsViewAura, RenderViewHostDelegateView implementation:
1102
1103void WebContentsViewAura::ShowContextMenu(RenderFrameHost* render_frame_host,
1104                                          const ContextMenuParams& params) {
1105  if (touch_editable_) {
1106    touch_editable_->EndTouchEditing(false);
1107  }
1108  if (delegate_) {
1109    delegate_->ShowContextMenu(render_frame_host, params);
1110    // WARNING: we may have been deleted during the call to ShowContextMenu().
1111  }
1112}
1113
1114void WebContentsViewAura::StartDragging(
1115    const DropData& drop_data,
1116    blink::WebDragOperationsMask operations,
1117    const gfx::ImageSkia& image,
1118    const gfx::Vector2d& image_offset,
1119    const DragEventSourceInfo& event_info) {
1120  aura::Window* root_window = GetNativeView()->GetRootWindow();
1121  if (!aura::client::GetDragDropClient(root_window)) {
1122    web_contents_->SystemDragEnded();
1123    return;
1124  }
1125
1126  if (touch_editable_)
1127    touch_editable_->EndTouchEditing(false);
1128
1129  ui::OSExchangeData::Provider* provider = ui::OSExchangeData::CreateProvider();
1130  PrepareDragData(drop_data, provider, web_contents_);
1131
1132  ui::OSExchangeData data(provider);  // takes ownership of |provider|.
1133
1134  if (!image.isNull()) {
1135    drag_utils::SetDragImageOnDataObject(image,
1136        gfx::Size(image.width(), image.height()), image_offset, &data);
1137  }
1138
1139  scoped_ptr<WebDragSourceAura> drag_source(
1140      new WebDragSourceAura(GetNativeView(), web_contents_));
1141
1142  // We need to enable recursive tasks on the message loop so we can get
1143  // updates while in the system DoDragDrop loop.
1144  int result_op = 0;
1145  {
1146    gfx::NativeView content_native_view = GetContentNativeView();
1147    base::MessageLoop::ScopedNestableTaskAllower allow(
1148        base::MessageLoop::current());
1149    result_op = aura::client::GetDragDropClient(root_window)
1150        ->StartDragAndDrop(data,
1151                           root_window,
1152                           content_native_view,
1153                           event_info.event_location,
1154                           ConvertFromWeb(operations),
1155                           event_info.event_source);
1156  }
1157
1158  // Bail out immediately if the contents view window is gone. Note that it is
1159  // not safe to access any class members in this case since |this| may already
1160  // be destroyed. The local variable |drag_source| will still be valid though,
1161  // so we can use it to determine if the window is gone.
1162  if (!drag_source->window()) {
1163    // Note that in this case, we don't need to call SystemDragEnded() since the
1164    // renderer is going away.
1165    return;
1166  }
1167
1168  EndDrag(ConvertToWeb(result_op));
1169  web_contents_->SystemDragEnded();
1170}
1171
1172void WebContentsViewAura::UpdateDragCursor(blink::WebDragOperation operation) {
1173  current_drag_op_ = operation;
1174}
1175
1176void WebContentsViewAura::GotFocus() {
1177  if (web_contents_->GetDelegate())
1178    web_contents_->GetDelegate()->WebContentsFocused(web_contents_);
1179}
1180
1181void WebContentsViewAura::TakeFocus(bool reverse) {
1182  if (web_contents_->GetDelegate() &&
1183      !web_contents_->GetDelegate()->TakeFocus(web_contents_, reverse) &&
1184      delegate_.get()) {
1185    delegate_->TakeFocus(reverse);
1186  }
1187}
1188
1189////////////////////////////////////////////////////////////////////////////////
1190// WebContentsViewAura, OverscrollControllerDelegate implementation:
1191
1192gfx::Rect WebContentsViewAura::GetVisibleBounds() const {
1193  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
1194  if (!rwhv || !rwhv->IsShowing())
1195    return gfx::Rect();
1196
1197  return rwhv->GetViewBounds();
1198}
1199
1200void WebContentsViewAura::OnOverscrollUpdate(float delta_x, float delta_y) {
1201  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
1202    return;
1203
1204  aura::Window* target = GetWindowToAnimateForOverscroll();
1205  ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
1206  settings.SetPreemptionStrategy(ui::LayerAnimator::IMMEDIATELY_SET_NEW_TARGET);
1207  gfx::Vector2d translate = GetTranslationForOverscroll(delta_x, delta_y);
1208  gfx::Transform transform;
1209
1210  // Vertical overscrolls don't participate in the navigation gesture.
1211  if (current_overscroll_gesture_ != OVERSCROLL_NORTH &&
1212      current_overscroll_gesture_ != OVERSCROLL_SOUTH) {
1213    transform.Translate(translate.x(), translate.y());
1214    target->SetTransform(transform);
1215    UpdateOverscrollWindowBrightness(delta_x);
1216  }
1217
1218  OverscrollUpdateForWebContentsDelegate(translate.y());
1219}
1220
1221void WebContentsViewAura::OnOverscrollComplete(OverscrollMode mode) {
1222  UMA_HISTOGRAM_ENUMERATION("Overscroll.Completed", mode, OVERSCROLL_COUNT);
1223  OverscrollUpdateForWebContentsDelegate(0);
1224  NavigationControllerImpl& controller = web_contents_->GetController();
1225  if (ShouldNavigateForward(controller, mode) ||
1226      ShouldNavigateBack(controller, mode)) {
1227    CompleteOverscrollNavigation(mode);
1228    return;
1229  }
1230
1231  ResetOverscrollTransform();
1232}
1233
1234void WebContentsViewAura::OnOverscrollModeChange(OverscrollMode old_mode,
1235                                                 OverscrollMode new_mode) {
1236  // Reset any in-progress overscroll animation first.
1237  ResetOverscrollTransform();
1238
1239  if (new_mode != OVERSCROLL_NONE && touch_editable_)
1240    touch_editable_->OverscrollStarted();
1241
1242  if (new_mode == OVERSCROLL_NONE ||
1243      !GetContentNativeView() ||
1244      ((new_mode == OVERSCROLL_EAST || new_mode == OVERSCROLL_WEST) &&
1245       navigation_overlay_.get() && navigation_overlay_->has_window())) {
1246    current_overscroll_gesture_ = OVERSCROLL_NONE;
1247    OverscrollUpdateForWebContentsDelegate(0);
1248  } else {
1249    aura::Window* target = GetWindowToAnimateForOverscroll();
1250    if (target) {
1251      StopObservingImplicitAnimations();
1252      target->layer()->GetAnimator()->AbortAllAnimations();
1253    }
1254    // Cleanup state of the content window first, because that can reset the
1255    // value of |current_overscroll_gesture_|.
1256    PrepareContentWindowForOverscroll();
1257
1258    current_overscroll_gesture_ = new_mode;
1259    if (current_overscroll_gesture_ == OVERSCROLL_EAST ||
1260        current_overscroll_gesture_ == OVERSCROLL_WEST)
1261      PrepareOverscrollWindow();
1262
1263    UMA_HISTOGRAM_ENUMERATION("Overscroll.Started", new_mode, OVERSCROLL_COUNT);
1264  }
1265  completed_overscroll_gesture_ = OVERSCROLL_NONE;
1266}
1267
1268////////////////////////////////////////////////////////////////////////////////
1269// WebContentsViewAura, ui::ImplicitAnimationObserver implementation:
1270
1271void WebContentsViewAura::OnImplicitAnimationsCompleted() {
1272  overscroll_shadow_.reset();
1273
1274  if (ShouldNavigateForward(web_contents_->GetController(),
1275                            completed_overscroll_gesture_)) {
1276    web_contents_->GetController().GoForward();
1277    PrepareOverscrollNavigationOverlay();
1278  } else if (ShouldNavigateBack(web_contents_->GetController(),
1279                                completed_overscroll_gesture_)) {
1280    web_contents_->GetController().GoBack();
1281    PrepareOverscrollNavigationOverlay();
1282  } else {
1283    if (touch_editable_)
1284      touch_editable_->OverscrollCompleted();
1285  }
1286
1287  aura::Window* content = GetContentNativeView();
1288  if (content) {
1289    content->SetTransform(gfx::Transform());
1290    content->layer()->SetLayerBrightness(0.f);
1291  }
1292  current_overscroll_gesture_ = OVERSCROLL_NONE;
1293  completed_overscroll_gesture_ = OVERSCROLL_NONE;
1294  overscroll_window_.reset();
1295}
1296
1297////////////////////////////////////////////////////////////////////////////////
1298// WebContentsViewAura, aura::WindowDelegate implementation:
1299
1300gfx::Size WebContentsViewAura::GetMinimumSize() const {
1301  return gfx::Size();
1302}
1303
1304gfx::Size WebContentsViewAura::GetMaximumSize() const {
1305  return gfx::Size();
1306}
1307
1308void WebContentsViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
1309                                          const gfx::Rect& new_bounds) {
1310  SizeChangedCommon(new_bounds.size());
1311  if (delegate_)
1312    delegate_->SizeChanged(new_bounds.size());
1313
1314  // Constrained web dialogs, need to be kept centered over our content area.
1315  for (size_t i = 0; i < window_->children().size(); i++) {
1316    if (window_->children()[i]->GetProperty(
1317            aura::client::kConstrainedWindowKey)) {
1318      gfx::Rect bounds = window_->children()[i]->bounds();
1319      bounds.set_origin(
1320          gfx::Point((new_bounds.width() - bounds.width()) / 2,
1321                     (new_bounds.height() - bounds.height()) / 2));
1322      window_->children()[i]->SetBounds(bounds);
1323    }
1324  }
1325}
1326
1327gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {
1328  return gfx::kNullCursor;
1329}
1330
1331int WebContentsViewAura::GetNonClientComponent(const gfx::Point& point) const {
1332  return HTCLIENT;
1333}
1334
1335bool WebContentsViewAura::ShouldDescendIntoChildForEventHandling(
1336    aura::Window* child,
1337    const gfx::Point& location) {
1338  return true;
1339}
1340
1341bool WebContentsViewAura::CanFocus() {
1342  // Do not take the focus if the render widget host view aura is gone or
1343  // is in the process of shutting down because neither the view window nor
1344  // this window can handle key events.
1345  RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
1346      web_contents_->GetRenderWidgetHostView());
1347  if (view != NULL && !view->IsClosing())
1348    return true;
1349
1350  return false;
1351}
1352
1353void WebContentsViewAura::OnCaptureLost() {
1354}
1355
1356void WebContentsViewAura::OnPaint(gfx::Canvas* canvas) {
1357}
1358
1359void WebContentsViewAura::OnDeviceScaleFactorChanged(
1360    float device_scale_factor) {
1361}
1362
1363void WebContentsViewAura::OnWindowDestroying(aura::Window* window) {
1364  // This means the destructor is going to be called soon. If there is an
1365  // overscroll gesture in progress (i.e. |overscroll_window_| is not NULL),
1366  // then destroying it in the WebContentsViewAura destructor can trigger other
1367  // virtual functions to be called (e.g. OnImplicitAnimationsCompleted()). So
1368  // destroy the overscroll window here.
1369  navigation_overlay_.reset();
1370  overscroll_window_.reset();
1371}
1372
1373void WebContentsViewAura::OnWindowDestroyed(aura::Window* window) {
1374}
1375
1376void WebContentsViewAura::OnWindowTargetVisibilityChanged(bool visible) {
1377  if (visible)
1378    web_contents_->WasShown();
1379  else
1380    web_contents_->WasHidden();
1381}
1382
1383bool WebContentsViewAura::HasHitTestMask() const {
1384  return false;
1385}
1386
1387void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
1388}
1389
1390////////////////////////////////////////////////////////////////////////////////
1391// WebContentsViewAura, ui::EventHandler implementation:
1392
1393void WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
1394}
1395
1396void WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
1397  if (!web_contents_->GetDelegate())
1398    return;
1399
1400  switch (event->type()) {
1401    case ui::ET_MOUSE_PRESSED:
1402      web_contents_->GetDelegate()->ActivateContents(web_contents_);
1403      break;
1404    case ui::ET_MOUSE_MOVED:
1405    case ui::ET_MOUSE_EXITED:
1406      web_contents_->GetDelegate()->ContentsMouseEvent(
1407          web_contents_,
1408          gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
1409          event->type() == ui::ET_MOUSE_MOVED);
1410      break;
1411    default:
1412      break;
1413  }
1414}
1415
1416////////////////////////////////////////////////////////////////////////////////
1417// WebContentsViewAura, aura::client::DragDropDelegate implementation:
1418
1419void WebContentsViewAura::OnDragEntered(const ui::DropTargetEvent& event) {
1420  if (drag_dest_delegate_)
1421    drag_dest_delegate_->DragInitialize(web_contents_);
1422
1423  current_drop_data_.reset(new DropData());
1424
1425  PrepareDropData(current_drop_data_.get(), event.data());
1426  blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());
1427
1428  gfx::Point screen_pt =
1429      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
1430  current_rvh_for_drag_ = web_contents_->GetRenderViewHost();
1431  web_contents_->GetRenderViewHost()->DragTargetDragEnter(
1432      *current_drop_data_.get(), event.location(), screen_pt, op,
1433      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1434
1435  if (drag_dest_delegate_) {
1436    drag_dest_delegate_->OnReceiveDragData(event.data());
1437    drag_dest_delegate_->OnDragEnter();
1438  }
1439}
1440
1441int WebContentsViewAura::OnDragUpdated(const ui::DropTargetEvent& event) {
1442  DCHECK(current_rvh_for_drag_);
1443  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1444    OnDragEntered(event);
1445
1446  blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());
1447  gfx::Point screen_pt =
1448      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
1449  web_contents_->GetRenderViewHost()->DragTargetDragOver(
1450      event.location(), screen_pt, op,
1451      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1452
1453  if (drag_dest_delegate_)
1454    drag_dest_delegate_->OnDragOver();
1455
1456  return ConvertFromWeb(current_drag_op_);
1457}
1458
1459void WebContentsViewAura::OnDragExited() {
1460  DCHECK(current_rvh_for_drag_);
1461  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1462    return;
1463
1464  web_contents_->GetRenderViewHost()->DragTargetDragLeave();
1465  if (drag_dest_delegate_)
1466    drag_dest_delegate_->OnDragLeave();
1467
1468  current_drop_data_.reset();
1469}
1470
1471int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
1472  DCHECK(current_rvh_for_drag_);
1473  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
1474    OnDragEntered(event);
1475
1476  web_contents_->GetRenderViewHost()->DragTargetDrop(
1477      event.location(),
1478      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
1479      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
1480  if (drag_dest_delegate_)
1481    drag_dest_delegate_->OnDrop();
1482  current_drop_data_.reset();
1483  return ConvertFromWeb(current_drag_op_);
1484}
1485
1486}  // namespace content
1487