[Athena] Simple pull to refresh implementation

content/browser/web_contents/web_contents_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/web_contents/web_contents_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/metrics/histogram.h"
@@ skipping 1270 matching lines @@
 }
 
 bool WebContentsViewAura::OnOverscrollUpdate(float delta_x, float delta_y) {
   if (current_overscroll_gesture_ == OVERSCROLL_NONE)
     return false;
 
   aura::Window* target = GetWindowToAnimateForOverscroll();
   gfx::Vector2d translate = GetTranslationForOverscroll(delta_x, delta_y);
   gfx::Transform transform;
 
-  // Vertical overscrolls don't participate in the navigation gesture.
-  if (current_overscroll_gesture_ != OVERSCROLL_NORTH &&
-      current_overscroll_gesture_ != OVERSCROLL_SOUTH) {
+  if (current_overscroll_gesture_ == OVERSCROLL_NORTH ||
+      current_overscroll_gesture_ == OVERSCROLL_SOUTH) {
+    OverscrollUpdateForWebContentsDelegate(translate.y());
+  } else {
+    // Only horizontal overscrolls participate in the navigation gesture.
     transform.Translate(translate.x(), translate.y());
     target->SetTransform(transform);
     UpdateOverscrollWindowBrightness(delta_x);
   }
 
-  OverscrollUpdateForWebContentsDelegate(translate.y());
   return !translate.IsZero();
 }
 
 void WebContentsViewAura::OnOverscrollComplete(OverscrollMode mode) {
   UMA_HISTOGRAM_ENUMERATION("Overscroll.Completed", mode, OVERSCROLL_COUNT);
-  OverscrollUpdateForWebContentsDelegate(0);
+  if (web_contents_->GetDelegate() &&
+      IsScrollEndEffectEnabled() &&
+      (mode == OVERSCROLL_NORTH || mode == OVERSCROLL_SOUTH)) {
+    web_contents_->GetDelegate()->OverscrollComplete();
+  }
   NavigationControllerImpl& controller = web_contents_->GetController();
   if (ShouldNavigateForward(controller, mode) ||
       ShouldNavigateBack(controller, mode)) {
     CompleteOverscrollNavigation(mode);
     return;
   }
 
   ResetOverscrollTransform();
 }
 
 void WebContentsViewAura::OnOverscrollModeChange(OverscrollMode old_mode,
                                                  OverscrollMode new_mode) {
   // Reset any in-progress overscroll animation first.
   ResetOverscrollTransform();
 
+  if (old_mode == OVERSCROLL_NORTH || old_mode == OVERSCROLL_SOUTH)
+    OverscrollUpdateForWebContentsDelegate(0);
+
   if (new_mode != OVERSCROLL_NONE && touch_editable_)
     touch_editable_->OverscrollStarted();
 
   if (new_mode == OVERSCROLL_NONE ||
       !GetContentNativeView() ||
       ((new_mode == OVERSCROLL_EAST || new_mode == OVERSCROLL_WEST) &&
        navigation_overlay_.get() && navigation_overlay_->has_window())) {
     current_overscroll_gesture_ = OVERSCROLL_NONE;
-    OverscrollUpdateForWebContentsDelegate(0);
   } else {
     aura::Window* target = GetWindowToAnimateForOverscroll();
     if (target) {
       StopObservingImplicitAnimations();
       target->layer()->GetAnimator()->AbortAllAnimations();
     }
     // Cleanup state of the content window first, because that can reset the
     // value of |current_overscroll_gesture_|.
     PrepareContentWindowForOverscroll();
 
@@ skipping 264 matching lines @@
   if (visible) {
     if (!web_contents_->should_normally_be_visible())
       web_contents_->WasShown();
   } else {
     if (web_contents_->should_normally_be_visible())
       web_contents_->WasHidden();
   }
 }
 
 }  // namespace content