Remove all fling related stuff from the renderer assuming that browser side

webkit/child/fling_animator_impl_android.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 "webkit/child/fling_animator_impl_android.h"
-
-#include "base/android/jni_android.h"
-#include "base/android/scoped_java_ref.h"
-#include "base/logging.h"
-#include "jni/OverScroller_jni.h"
-#include "third_party/WebKit/public/platform/WebFloatSize.h"
-#include "third_party/WebKit/public/platform/WebGestureCurveTarget.h"
-#include "ui/gfx/screen.h"
-#include "ui/gfx/vector2d.h"
-
-namespace webkit_glue {
-
-namespace {
-static const float kEpsilon = 1e-4;
-}
-
-FlingAnimatorImpl::FlingAnimatorImpl()
-    : is_active_(false) {
-  // hold the global reference of the Java objects.
-  JNIEnv* env = base::android::AttachCurrentThread();
-  java_scroller_.Reset(JNI_OverScroller::Java_OverScroller_ConstructorAWOS_ACC(
-      env,
-      base::android::GetApplicationContext()));
-}
-
-FlingAnimatorImpl::~FlingAnimatorImpl()
-{
-}
-
-//static
-bool FlingAnimatorImpl::RegisterJni(JNIEnv* env) {
-  return JNI_OverScroller::RegisterNativesImpl(env);
-}
-
-void FlingAnimatorImpl::StartFling(const gfx::PointF& velocity)
-{
-  // No bounds on the fling. See http://webkit.org/b/96403
-  // Instead, use the largest possible bounds for minX/maxX/minY/maxY. The
-  // compositor will ignore any attempt to scroll beyond the end of the page.
-
-  DCHECK(velocity.x() || velocity.y());
-  if (is_active_)
-    CancelFling();
-
-  is_active_ = true;
-  last_time_ = 0;
-  last_velocity_ = velocity;
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-
-  JNI_OverScroller::Java_OverScroller_flingV_I_I_I_I_I_I_I_I(
-      env, java_scroller_.obj(), 0, 0,
-      static_cast<int>(velocity.x()),
-      static_cast<int>(velocity.y()),
-      INT_MIN, INT_MAX, INT_MIN, INT_MAX);
-}
-
-void FlingAnimatorImpl::CancelFling()
-{
-  if (!is_active_)
-    return;
-
-  is_active_ = false;
-  JNIEnv* env = base::android::AttachCurrentThread();
-  JNI_OverScroller::Java_OverScroller_abortAnimation(env, java_scroller_.obj());
-}
-
-bool FlingAnimatorImpl::UpdatePosition()
-{
-  JNIEnv* env = base::android::AttachCurrentThread();
-  bool result = JNI_OverScroller::Java_OverScroller_computeScrollOffset(
-      env,
-      java_scroller_.obj());
-  return is_active_ = result;
-}
-
-gfx::Point FlingAnimatorImpl::GetCurrentPosition()
-{
-  JNIEnv* env = base::android::AttachCurrentThread();
-  gfx::Point position(
-      JNI_OverScroller::Java_OverScroller_getCurrX(env, java_scroller_.obj()),
-      JNI_OverScroller::Java_OverScroller_getCurrY(env, java_scroller_.obj()));
-  return position;
-}
-
-float FlingAnimatorImpl::GetCurrentVelocity()
-{
-  JNIEnv* env = base::android::AttachCurrentThread();
-  // TODO(jdduke): Add Java-side hooks for getCurrVelocityX/Y, and return
-  //               vector velocity.
-  return JNI_OverScroller::Java_OverScroller_getCurrVelocity(
-      env, java_scroller_.obj());
-}
-
-bool FlingAnimatorImpl::apply(double time,
-                              WebKit::WebGestureCurveTarget* target) {
-  if (!UpdatePosition())
-    return false;
-
-  gfx::Point current_position = GetCurrentPosition();
-  gfx::Vector2d diff(current_position - last_position_);
-  last_position_ = current_position;
-  float dpi_scale = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay()
-      .device_scale_factor();
-  WebKit::WebFloatSize scroll_amount(diff.x() / dpi_scale,
-                                     diff.y() / dpi_scale);
-
-  float delta_time = time - last_time_;
-  last_time_ = time;
-
-  // Currently, the OverScroller only provides the velocity magnitude; use the
-  // angle of the scroll delta to yield approximate x and y velocity components.
-  // TODO(jdduke): Remove this when we can properly poll OverScroller velocity.
-  gfx::PointF current_velocity = last_velocity_;
-  if (delta_time > kEpsilon) {
-    float diff_length = diff.Length();
-    if (diff_length > kEpsilon) {
-      float velocity = GetCurrentVelocity();
-      float scroll_to_velocity = velocity / diff_length;
-      current_velocity = gfx::PointF(diff.x() * scroll_to_velocity,
-                                     diff.y() * scroll_to_velocity);
-    }
-  }
-  last_velocity_ = current_velocity;
-  WebKit::WebFloatSize fling_velocity(current_velocity.x() / dpi_scale,
-                                      current_velocity.y() / dpi_scale);
-  target->notifyCurrentFlingVelocity(fling_velocity);
-
-  // scrollBy() could delete this curve if the animation is over, so don't touch
-  // any member variables after making that call.
-  target->scrollBy(scroll_amount);
-  return true;
-}
-
-FlingAnimatorImpl* FlingAnimatorImpl::CreateAndroidGestureCurve(
-    const WebKit::WebFloatPoint& velocity,
-    const WebKit::WebSize&) {
-  FlingAnimatorImpl* gesture_curve = new FlingAnimatorImpl();
-  gesture_curve->StartFling(velocity);
-  return gesture_curve;
-}
-
-} // namespace webkit_glue