Move OverscrollController to RenderWidgetHostViewAura

content/browser/renderer_host/render_widget_host_view_aura.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/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
+#include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/resources/texture_mailbox.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
@@ skipping 10 matching lines @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/ui_events_helper.h"
 #include "content/browser/renderer_host/web_input_event_aura.h"
 #include "content/common/gpu/client/gl_helper.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/browser/user_metrics.h"
+#include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/platform/WebScreenInfo.h"
 #include "third_party/WebKit/public/web/WebCompositionUnderline.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/cursor_client_observer.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/env.h"
@@ skipping 35 matching lines @@
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "content/common/input_messages.h"
 #include "ui/events/linux/text_edit_command_auralinux.h"
 #include "ui/events/linux/text_edit_key_bindings_delegate_auralinux.h"
 #endif
 
 using gfx::RectToSkIRect;
 using gfx::SkIRectToRect;
 
 using blink::WebScreenInfo;
+using blink::WebInputEvent;
+using blink::WebGestureEvent;
 using blink::WebTouchEvent;
 
 namespace content {
 
 namespace {
 
 // In mouse lock mode, we need to prevent the (invisible) cursor from hitting
 // the border of the view, in order to get valid movement information. However,
 // forcing the cursor back to the center of the view after each mouse move
 // doesn't work well. It reduces the frequency of useful mouse move messages
@@ skipping 321 matching lines @@
       touch_editing_client_(NULL),
       weak_ptr_factory_(this) {
   host_->SetView(this);
   window_observer_.reset(new WindowObserver(this));
   aura::client::SetTooltipText(window_, &tooltip_);
   aura::client::SetActivationDelegate(window_, this);
   aura::client::SetActivationChangeObserver(window_, this);
   aura::client::SetFocusChangeObserver(window_, this);
   window_->set_layer_owner_delegate(delegated_frame_host_.get());
   gfx::Screen::GetScreenFor(window_)->AddObserver(this);
+
+  bool overscroll_enabled =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kOverscrollHistoryNavigation) != "0";
+  SetOverscrollControllerEnabled(overscroll_enabled);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, RenderWidgetHostView implementation:
 
 bool RenderWidgetHostViewAura::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderWidgetHostViewAura, message)
     // TODO(kevers): Move to RenderWidgetHostViewImpl and consolidate IPC
@@ skipping 696 matching lines @@
                    GetSystemMetrics(SM_CXPADDEDBORDER));
     }
   }
 
   bounds = gfx::win::ScreenToDIPRect(bounds);
 #endif
 
   return bounds;
 }
 
+void RenderWidgetHostViewAura::WheelEventAck(
+    const blink::WebMouseWheelEvent& event,
+    InputEventAckState ack_result) {
+  if (overscroll_controller_) {
+    overscroll_controller_->ReceivedEventACK(
+        event, (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result));
+  }
+}
+
 void RenderWidgetHostViewAura::GestureEventAck(
     const blink::WebGestureEvent& event,
     InputEventAckState ack_result) {
   if (touch_editing_client_)
     touch_editing_client_->GestureEventAck(event.type);
+
+  if (overscroll_controller_) {
+    overscroll_controller_->ReceivedEventACK(
+        event, (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result));
+  }
 }
 
 void RenderWidgetHostViewAura::ProcessAckedTouchEvent(
     const TouchEventWithLatencyInfo& touch, InputEventAckState ack_result) {
   ScopedVector<ui::TouchEvent> events;
   if (!MakeUITouchEventsFromWebTouchEvents(touch, &events,
                                            SCREEN_COORDINATES))
     return;
 
   aura::WindowTreeHost* host = window_->GetHost();
@@ skipping 13 matching lines @@
 RenderWidgetHostViewAura::CreateSyntheticGestureTarget() {
   return scoped_ptr<SyntheticGestureTarget>(
       new SyntheticGestureTargetAura(host_));
 }
 
 void RenderWidgetHostViewAura::SetScrollOffsetPinning(
     bool is_pinned_to_left, bool is_pinned_to_right) {
   // Not needed. Mac-only.
 }
 
+InputEventAckState RenderWidgetHostViewAura::FilterInputEvent(
+    const blink::WebInputEvent& input_event) {
+  bool consumed = false;
+  if (input_event.type == WebInputEvent::GestureFlingStart) {
+    const WebGestureEvent& gesture_event =
+        static_cast<const WebGestureEvent&>(input_event);
+    // Zero-velocity touchpad flings are an Aura-specific signal that the
+    // touchpad scroll has ended, and should not be forwarded to the renderer.
+    if (gesture_event.sourceDevice == WebGestureEvent::Touchpad &&
+        !gesture_event.data.flingStart.velocityX &&
+        !gesture_event.data.flingStart.velocityY) {
+      consumed = true;
+    }
+  }
+
+  if (overscroll_controller_) {
+    consumed |= (overscroll_controller_->DispatchEvent(input_event) ==
+                 OverscrollController::CONSUMED);
+  }
+
+  // TODO(jdduke): Determine if necessary.
+  /*
+  if (disposition == OverscrollController::SHOULD_FORWARD_TO_GESTURE_QUEUE) {
+    DCHECK(WebInputEvent::isGestureEventType(input_event.type));
+    DCHECK(host_);
+    const blink::WebGestureEvent& gesture_event =
+        static_cast<const blink::WebGestureEvent&>(input_event);
+    consumed = true;
+    host_->ForwardGestureEvent(
+        GestureEventWithLatencyInfo(gesture_event, latency_info));
+  }
+  */
+
+  return consumed && !WebTouchEvent::isTouchEventType(input_event.type)
+             ? INPUT_EVENT_ACK_STATE_CONSUMED
+             : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
+}
+
 void RenderWidgetHostViewAura::CreateBrowserAccessibilityManagerIfNeeded() {
   if (GetBrowserAccessibilityManager())
     return;
 
   BrowserAccessibilityManager* manager = NULL;
 #if defined(OS_WIN)
   aura::WindowTreeHost* host = window_->GetHost();
   if (!host)
     return;
   HWND hwnd = host->GetAcceleratedWidget();
@@ skipping 431 matching lines @@
   LPARAM lparam = reinterpret_cast<LPARAM>(this);
   EnumChildWindows(parent, WindowDestroyingCallback, lparam);
 #endif
 
   // Make sure that the input method no longer references to this object before
   // this object is removed from the root window (i.e. this object loses access
   // to the input method).
   ui::InputMethod* input_method = GetInputMethod();
   if (input_method)
     input_method->DetachTextInputClient(this);
+
+  if (overscroll_controller_)
+    overscroll_controller_->Reset();
 }
 
 void RenderWidgetHostViewAura::OnWindowDestroyed(aura::Window* window) {
   host_->ViewDestroyed();
   delete this;
 }
 
 void RenderWidgetHostViewAura::OnWindowTargetVisibilityChanged(bool visible) {
 }
 
@@ skipping 126 matching lines @@
     }
     return;
   }
 
   // As the overscroll is handled during scroll events from the trackpad, the
   // RWHVA window is transformed by the overscroll controller. This transform
   // triggers a synthetic mouse-move event to be generated (by the aura
   // RootWindow). But this event interferes with the overscroll gesture. So,
   // ignore such synthetic mouse-move events if an overscroll gesture is in
   // progress.
-  if (host_->overscroll_controller() &&
-      host_->overscroll_controller()->overscroll_mode() != OVERSCROLL_NONE &&
+  if (overscroll_controller_ &&
+      overscroll_controller_->overscroll_mode() != OVERSCROLL_NONE &&
       event->flags() & ui::EF_IS_SYNTHESIZED &&
       (event->type() == ui::ET_MOUSE_ENTERED ||
        event->type() == ui::ET_MOUSE_EXITED ||
        event->type() == ui::ET_MOUSE_MOVED)) {
     event->StopPropagation();
     return;
   }
 
   if (event->type() == ui::ET_MOUSEWHEEL) {
 #if defined(OS_WIN)
@@ skipping 234 matching lines @@
   } else if (window_ == lost_focus) {
     host_->SetActive(false);
     host_->Blur();
 
     DetachFromInputMethod();
     host_->SetInputMethodActive(false);
 
     if (touch_editing_client_)
       touch_editing_client_->EndTouchEditing(false);
 
+    if (overscroll_controller_)
+      overscroll_controller_->Cancel();
+
     BrowserAccessibilityManager* manager = GetBrowserAccessibilityManager();
     if (manager)
       manager->OnWindowBlurred();
 
     // If we lose the focus while fullscreen, close the window; Pepper Flash
     // won't do it for us (unlike NPAPI Flash). However, we do not close the
     // window if we lose the focus to a window on another display.
     gfx::Screen* screen = gfx::Screen::GetScreenFor(window_);
     bool focusing_other_display =
         gained_focus && screen->GetNumDisplays() > 1 &&
@@ skipping 153 matching lines @@
     bool is_visible) {
   if (host_->is_hidden() ||
       (cursor_visibility_state_in_renderer_ == VISIBLE && is_visible) ||
       (cursor_visibility_state_in_renderer_ == NOT_VISIBLE && !is_visible))
     return;
 
   cursor_visibility_state_in_renderer_ = is_visible ? VISIBLE : NOT_VISIBLE;
   host_->SendCursorVisibilityState(is_visible);
 }
 
+void RenderWidgetHostViewAura::SetOverscrollControllerEnabled(bool enabled) {
+  if (!enabled)
+    overscroll_controller_.reset();
+  else if (!overscroll_controller_)
+    overscroll_controller_.reset(new OverscrollController());
+}
+
 void RenderWidgetHostViewAura::SchedulePaintIfNotInClip(
     const gfx::Rect& rect,
     const gfx::Rect& clip) {
   if (!clip.IsEmpty()) {
     gfx::Rect to_paint = gfx::SubtractRects(rect, clip);
     if (!to_paint.IsEmpty())
       window_->SchedulePaintInRect(to_paint);
   } else {
     window_->SchedulePaintInRect(rect);
   }
@@ skipping 152 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content