Disable overscroll navigation when emulating touch.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 329 matching lines @@
       is_showing_before_unload_dialog_(false),
       last_active_time_(base::TimeTicks::Now()),
       closed_by_user_gesture_(false),
       minimum_zoom_percent_(static_cast<int>(kMinimumZoomFactor * 100)),
       maximum_zoom_percent_(static_cast<int>(kMaximumZoomFactor * 100)),
       totalPinchGestureAmount_(0),
       currentPinchZoomStepDelta_(0),
       render_view_message_source_(NULL),
       fullscreen_widget_routing_id_(MSG_ROUTING_NONE),
       is_subframe_(false),
+      touch_emulation_enabled_(false),
       last_dialog_suppressed_(false) {
   for (size_t i = 0; i < g_created_callbacks.Get().size(); i++)
     g_created_callbacks.Get().at(i).Run(this);
   frame_tree_.SetFrameRemoveListener(
       base::Bind(&WebContentsImpl::OnFrameRemoved,
                  base::Unretained(this)));
 }
 
 WebContentsImpl::~WebContentsImpl() {
   is_being_destroyed_ = true;
@@ skipping 246 matching lines @@
   // TODO(cbentzel): remove this debugging code?
   if (delegate == delegate_)
     return;
   if (delegate_)
     delegate_->Detach(this);
   delegate_ = delegate;
   if (delegate_) {
     delegate_->Attach(this);
     // Ensure the visible RVH reflects the new delegate's preferences.
     if (view_)
-      view_->SetOverscrollControllerEnabled(delegate->CanOverscrollContent());
+      view_->SetOverscrollControllerEnabled(CanOverscrollContent());
   }
 }
 
 RenderProcessHost* WebContentsImpl::GetRenderProcessHost() const {
   RenderViewHostImpl* host = GetRenderManager()->current_host();
   return host ? host->GetProcess() : NULL;
 }
 
 RenderFrameHost* WebContentsImpl::GetMainFrame() {
   return frame_tree_.root()->current_frame_host();
@@ skipping 1064 matching lines @@
     const gfx::Rect& anchor_in_root_view) {
   if (delegate_)
     delegate_->MoveValidationMessage(this, anchor_in_root_view);
 }
 
 void WebContentsImpl::DidSendScreenRects(RenderWidgetHostImpl* rwh) {
   if (browser_plugin_embedder_)
     browser_plugin_embedder_->DidSendScreenRects();
 }
 
+void WebContentsImpl::OnTouchEmulationEnabled(bool enabled) {
+  touch_emulation_enabled_ = enabled;
+  if (view_)
+    view_->SetOverscrollControllerEnabled(CanOverscrollContent());
+}
+
 void WebContentsImpl::UpdatePreferredSize(const gfx::Size& pref_size) {
   const gfx::Size old_size = GetPreferredSize();
   preferred_size_ = pref_size;
   OnPreferredSizeChanged(old_size);
 }
 
 void WebContentsImpl::ResizeDueToAutoResize(const gfx::Size& new_size) {
   if (delegate_)
     delegate_->ResizeDueToAutoResize(this, new_size);
 }
@@ skipping 738 matching lines @@
     // displayed insecure content.
     displayed_insecure_content_ = false;
     SSLManager::NotifySSLInternalStateChanged(
         GetController().GetBrowserContext());
   }
 
   // Notify observers about navigation.
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidNavigateMainFrame(details, params));
 
-  if (delegate_) {
+  if (delegate_)
     delegate_->DidNavigateMainFramePostCommit(this);
-    view_->SetOverscrollControllerEnabled(delegate_->CanOverscrollContent());
-  }
+  view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 void WebContentsImpl::DidNavigateAnyFramePostCommit(
     RenderFrameHostImpl* render_frame_host,
     const LoadCommittedDetails& details,
     const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {
   // Now that something has committed, we don't need to track whether the
   // initial page has been accessed.
   has_accessed_initial_document_ = false;
 
   // If we navigate off the page, close all JavaScript dialogs.
   if (dialog_manager_ && !details.is_in_page)
     dialog_manager_->CancelActiveAndPendingDialogs(this);
 
   // Notify observers about navigation.
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidNavigateAnyFrame(details, params));
 }
 
 void WebContentsImpl::SetMainFrameMimeType(const std::string& mime_type) {
   contents_mime_type_ = mime_type;
 }
 
 bool WebContentsImpl::CanOverscrollContent() const {
+  // Disable overscroll when touch emulation is on. See crbug.com/369938.
+  if (touch_emulation_enabled_)
+    return false;
+
   if (delegate_)
     return delegate_->CanOverscrollContent();
 
   return false;
 }
 
 void WebContentsImpl::OnDidLoadResourceFromMemoryCache(
     const GURL& url,
     const std::string& security_info,
     const std::string& http_method,
@@ skipping 791 matching lines @@
 }
 
 void WebContentsImpl::RenderViewCreated(RenderViewHost* render_view_host) {
   // Don't send notifications if we are just creating a swapped-out RVH for
   // the opener chain.  These won't be used for view-source or WebUI, so it's
   // ok to return early.
   if (static_cast<RenderViewHostImpl*>(render_view_host)->IsSwappedOut())
     return;
 
   if (delegate_)
-    view_->SetOverscrollControllerEnabled(delegate_->CanOverscrollContent());
+    view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 
   NotificationService::current()->Notify(
       NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
       Source<WebContents>(this),
       Details<RenderViewHost>(render_view_host));
 
   // When we're creating views, we're still doing initial setup, so we always
   // use the pending Web UI rather than any possibly existing committed one.
   if (GetRenderManager()->pending_web_ui())
     GetRenderManager()->pending_web_ui()->RenderViewCreated(render_view_host);
@@ skipping 481 matching lines @@
   if (dialog_manager_)
     dialog_manager_->CancelActiveAndPendingDialogs(this);
 }
 
 void WebContentsImpl::NotifySwappedFromRenderManager(RenderViewHost* old_host,
                                                      RenderViewHost* new_host) {
   NotifySwapped(old_host, new_host);
 
   // Make sure the visible RVH reflects the new delegate's preferences.
   if (delegate_)
-    view_->SetOverscrollControllerEnabled(delegate_->CanOverscrollContent());
+    view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 
   view_->RenderViewSwappedIn(new_host);
 }
 
 int WebContentsImpl::CreateOpenerRenderViewsForRenderManager(
     SiteInstance* instance) {
   if (!opener_)
     return MSG_ROUTING_NONE;
 
   // Recursively create RenderViews for anything else in the opener chain.
@@ skipping 239 matching lines @@
 
 void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
   if (!delegate_)
     return;
   const gfx::Size new_size = GetPreferredSize();
   if (new_size != old_size)
     delegate_->UpdatePreferredSize(this, new_size);
 }
 
 }  // namespace content