| // Copyright 2014 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/child/web_gesture_curve_impl.h" |
| |
| #include "base/logging.h" |
| #include "base/metrics/histogram.h" |
| #include "third_party/WebKit/public/platform/WebFloatSize.h" |
| #include "third_party/WebKit/public/platform/WebGestureCurveTarget.h" |
| #include "ui/events/gestures/fling_curve.h" |
| #include "ui/gfx/geometry/safe_integer_conversions.h" |
| #include "ui/gfx/geometry/vector2d.h" |
| |
| #if defined(OS_ANDROID) |
| #include "ui/events/android/scroller.h" |
| #endif |
| |
| using blink::WebGestureCurve; |
| |
| namespace content { |
| namespace { |
| |
| scoped_ptr<ui::GestureCurve> CreateDefaultPlatformCurve( |
| const gfx::Vector2dF& initial_velocity) { |
| DCHECK(!initial_velocity.IsZero()); |
| #if defined(OS_ANDROID) |
| auto scroller = make_scoped_ptr(new ui::Scroller(ui::Scroller::Config())); |
| scroller->Fling(0, |
| 0, |
| initial_velocity.x(), |
| initial_velocity.y(), |
| INT_MIN, |
| INT_MAX, |
| INT_MIN, |
| INT_MAX, |
| base::TimeTicks()); |
| return scroller.Pass(); |
| #else |
| return make_scoped_ptr( |
| new ui::FlingCurve(initial_velocity, base::TimeTicks())); |
| #endif |
| } |
| |
| } // namespace |
| |
| // static |
| scoped_ptr<WebGestureCurve> WebGestureCurveImpl::CreateFromDefaultPlatformCurve( |
| const gfx::Vector2dF& initial_velocity, |
| const gfx::Vector2dF& initial_offset, |
| bool on_main_thread) { |
| return scoped_ptr<WebGestureCurve>(new WebGestureCurveImpl( |
| CreateDefaultPlatformCurve(initial_velocity), initial_offset, |
| on_main_thread ? ThreadType::MAIN : ThreadType::IMPL)); |
| } |
| |
| // static |
| scoped_ptr<WebGestureCurve> WebGestureCurveImpl::CreateFromUICurveForTesting( |
| scoped_ptr<ui::GestureCurve> curve, |
| const gfx::Vector2dF& initial_offset) { |
| return scoped_ptr<WebGestureCurve>( |
| new WebGestureCurveImpl(curve.Pass(), initial_offset, ThreadType::TEST)); |
| } |
| |
| WebGestureCurveImpl::WebGestureCurveImpl(scoped_ptr<ui::GestureCurve> curve, |
| const gfx::Vector2dF& initial_offset, |
| ThreadType animating_thread_type) |
| : curve_(curve.Pass()), |
| last_offset_(initial_offset), |
| animating_thread_type_(animating_thread_type), |
| ticks_since_first_animate_(0), |
| first_animate_time_(0), |
| last_animate_time_(0) { |
| } |
| |
| WebGestureCurveImpl::~WebGestureCurveImpl() { |
| if (ticks_since_first_animate_ <= 1) |
| return; |
| |
| if (last_animate_time_ <= first_animate_time_) |
| return; |
| |
| switch (animating_thread_type_) { |
| case ThreadType::MAIN: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Frequency.Renderer.FlingAnimate", |
| gfx::ToRoundedInt(ticks_since_first_animate_ / |
| (last_animate_time_ - first_animate_time_)), |
| 1, 240, 120); |
| break; |
| case ThreadType::IMPL: |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "Event.Frequency.RendererImpl.FlingAnimate", |
| gfx::ToRoundedInt(ticks_since_first_animate_ / |
| (last_animate_time_ - first_animate_time_)), |
| 1, 240, 120); |
| break; |
| case ThreadType::TEST: |
| break; |
| } |
| } |
| |
| bool WebGestureCurveImpl::apply(double time, |
| blink::WebGestureCurveTarget* target) { |
| // If the fling has yet to start, simply return and report true to prevent |
| // fling termination. |
| if (time <= 0) |
| return true; |
| |
| if (!first_animate_time_) { |
| first_animate_time_ = last_animate_time_ = time; |
| } else if (time != last_animate_time_) { |
| // Animation can occur multiple times a frame, but with the same timestamp. |
| // Suppress recording of such redundant animate calls, avoiding artificially |
| // inflated FPS computation. |
| last_animate_time_ = time; |
| ++ticks_since_first_animate_; |
| } |
| |
| const base::TimeTicks time_ticks = |
| base::TimeTicks() + base::TimeDelta::FromSecondsD(time); |
| gfx::Vector2dF offset, velocity; |
| bool still_active = |
| curve_->ComputeScrollOffset(time_ticks, &offset, &velocity); |
| |
| gfx::Vector2dF delta = offset - last_offset_; |
| last_offset_ = offset; |
| |
| // As successive timestamps can be arbitrarily close (but monotonic!), don't |
| // assume that a zero delta means the curve has terminated. |
| if (delta.IsZero()) |
| return still_active; |
| |
| // scrollBy() could delete this curve if the animation is over, so don't touch |
| // any member variables after making that call. |
| bool did_scroll = target->scrollBy(blink::WebFloatSize(delta), |
| blink::WebFloatSize(velocity)); |
| return did_scroll && still_active; |
| } |
| |
| } // namespace content |