Rename classes related to top controls

cc/input/top_controls_manager.cc

Index: cc/input/top_controls_manager.cc
diff --git a/cc/input/top_controls_manager.cc b/cc/input/top_controls_manager.cc
deleted file mode 100644
index 3f0534232bc9f7700dcc12d3128da963a3769ce0..0000000000000000000000000000000000000000
--- a/cc/input/top_controls_manager.cc
+++ /dev/null
@@ -1,268 +0,0 @@
-// Copyright 2013 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 "cc/input/top_controls_manager.h"
-
-#include <stdint.h>
-
-#include <algorithm>
-
-#include "base/logging.h"
-#include "base/memory/ptr_util.h"
-#include "cc/input/top_controls_manager_client.h"
-#include "cc/output/begin_frame_args.h"
-#include "cc/trees/layer_tree_impl.h"
-#include "ui/gfx/animation/tween.h"
-#include "ui/gfx/geometry/vector2d_f.h"
-#include "ui/gfx/transform.h"
-
-namespace cc {
-namespace {
-// These constants were chosen empirically for their visually pleasant behavior.
-// Contact tedchoc@chromium.org for questions about changing these values.
-const int64_t kShowHideMaxDurationMs = 200;
-}
-
-// static
-std::unique_ptr<TopControlsManager> TopControlsManager::Create(
-    TopControlsManagerClient* client,
-    float top_controls_show_threshold,
-    float top_controls_hide_threshold) {
-  return base::WrapUnique(new TopControlsManager(
-      client, top_controls_show_threshold, top_controls_hide_threshold));
-}
-
-TopControlsManager::TopControlsManager(TopControlsManagerClient* client,
-                                       float top_controls_show_threshold,
-                                       float top_controls_hide_threshold)
-    : client_(client),
-      animation_start_value_(0.f),
-      animation_stop_value_(0.f),
-      animation_direction_(NO_ANIMATION),
-      permitted_state_(BOTH),
-      accumulated_scroll_delta_(0.f),
-      baseline_content_offset_(0.f),
-      top_controls_show_threshold_(top_controls_hide_threshold),
-      top_controls_hide_threshold_(top_controls_show_threshold),
-      pinch_gesture_active_(false) {
-  CHECK(client_);
-}
-
-TopControlsManager::~TopControlsManager() {
-}
-
-float TopControlsManager::ControlsTopOffset() const {
-  return ContentTopOffset() - TopControlsHeight();
-}
-
-float TopControlsManager::ContentTopOffset() const {
-  return TopControlsShownRatio() * TopControlsHeight();
-}
-
-float TopControlsManager::ContentOffsetInternal() const {
-  if (!TopControlsHeight())
-    return BottomControlsShownRatio() * BottomControlsHeight();
-  return ContentTopOffset();
-}
-
-float TopControlsManager::TopControlsShownRatio() const {
-  return client_->CurrentTopControlsShownRatio();
-}
-
-float TopControlsManager::TopControlsHeight() const {
-  return client_->TopControlsHeight();
-}
-
-float TopControlsManager::BottomControlsHeight() const {
-  return client_->BottomControlsHeight();
-}
-
-float TopControlsManager::ContentBottomOffset() const {
-  return BottomControlsShownRatio() * BottomControlsHeight();
-}
-
-float TopControlsManager::BottomControlsShownRatio() const {
-  return TopControlsShownRatio();
-}
-
-void TopControlsManager::UpdateTopControlsState(TopControlsState constraints,
-                                                TopControlsState current,
-                                                bool animate) {
-  DCHECK(!(constraints == SHOWN && current == HIDDEN));
-  DCHECK(!(constraints == HIDDEN && current == SHOWN));
-
-  permitted_state_ = constraints;
-
-  // Don't do anything if it doesn't matter which state the controls are in.
-  if (constraints == BOTH && current == BOTH)
-    return;
-
-  // Don't do anything if there is no change in offset.
-  float final_shown_ratio = 1.f;
-  if (constraints == HIDDEN || current == HIDDEN)
-    final_shown_ratio = 0.f;
-  if (final_shown_ratio == TopControlsShownRatio()) {
-    ResetAnimations();
-    return;
-  }
-
-  if (animate) {
-    SetupAnimation(final_shown_ratio ? SHOWING_CONTROLS : HIDING_CONTROLS);
-  } else {
-    ResetAnimations();
-    client_->SetCurrentTopControlsShownRatio(final_shown_ratio);
-  }
-}
-
-void TopControlsManager::ScrollBegin() {
-  if (pinch_gesture_active_)
-    return;
-
-  ResetAnimations();
-  ResetBaseline();
-}
-
-gfx::Vector2dF TopControlsManager::ScrollBy(
-    const gfx::Vector2dF& pending_delta) {
-  // If one or both of the top/bottom controls are showing, the shown ratio
-  // needs to be computed.
-  float controls_height =
-      TopControlsHeight() ? TopControlsHeight() : BottomControlsHeight();
-
-  if (!controls_height)
-    return pending_delta;
-
-  if (pinch_gesture_active_)
-    return pending_delta;
-
-  if (permitted_state_ == SHOWN && pending_delta.y() > 0)
-    return pending_delta;
-  else if (permitted_state_ == HIDDEN && pending_delta.y() < 0)
-    return pending_delta;
-
-  accumulated_scroll_delta_ += pending_delta.y();
-
-  float old_offset = ContentOffsetInternal();
-  client_->SetCurrentTopControlsShownRatio(
-      (baseline_content_offset_ - accumulated_scroll_delta_) / controls_height);
-
-  // If the controls are fully visible, treat the current position as the
-  // new baseline even if the gesture didn't end.
-  if (TopControlsShownRatio() == 1.f)
-    ResetBaseline();
-
-  ResetAnimations();
-
-  gfx::Vector2dF applied_delta(0.f, old_offset - ContentOffsetInternal());
-  return pending_delta - applied_delta;
-}
-
-void TopControlsManager::ScrollEnd() {
-  if (pinch_gesture_active_)
-    return;
-
-  StartAnimationIfNecessary();
-}
-
-void TopControlsManager::PinchBegin() {
-  DCHECK(!pinch_gesture_active_);
-  pinch_gesture_active_ = true;
-  StartAnimationIfNecessary();
-}
-
-void TopControlsManager::PinchEnd() {
-  DCHECK(pinch_gesture_active_);
-  // Pinch{Begin,End} will always occur within the scope of Scroll{Begin,End},
-  // so return to a state expected by the remaining scroll sequence.
-  pinch_gesture_active_ = false;
-  ScrollBegin();
-}
-
-void TopControlsManager::MainThreadHasStoppedFlinging() {
-  StartAnimationIfNecessary();
-}
-
-gfx::Vector2dF TopControlsManager::Animate(base::TimeTicks monotonic_time) {
-  if (!has_animation() || !client_->HaveRootScrollLayer())
-    return gfx::Vector2dF();
-
-  float old_offset = ContentOffsetInternal();
-  float new_ratio = gfx::Tween::ClampedFloatValueBetween(
-      monotonic_time, animation_start_time_, animation_start_value_,
-      animation_stop_time_, animation_stop_value_);
-  client_->SetCurrentTopControlsShownRatio(new_ratio);
-
-  if (IsAnimationComplete(new_ratio))
-    ResetAnimations();
-
-  gfx::Vector2dF scroll_delta(0.f, ContentOffsetInternal() - old_offset);
-  return scroll_delta;
-}
-
-void TopControlsManager::ResetAnimations() {
-  animation_start_time_ = base::TimeTicks();
-  animation_start_value_ = 0.f;
-  animation_stop_time_ = base::TimeTicks();
-  animation_stop_value_ = 0.f;
-
-  animation_direction_ = NO_ANIMATION;
-}
-
-void TopControlsManager::SetupAnimation(AnimationDirection direction) {
-  DCHECK_NE(NO_ANIMATION, direction);
-  DCHECK(direction != HIDING_CONTROLS || TopControlsShownRatio() > 0.f);
-  DCHECK(direction != SHOWING_CONTROLS || TopControlsShownRatio() < 1.f);
-
-  if (has_animation() && animation_direction_ == direction)
-    return;
-
-  if (!TopControlsHeight() && !BottomControlsHeight()) {
-    client_->SetCurrentTopControlsShownRatio(
-        direction == HIDING_CONTROLS ? 0.f : 1.f);
-    return;
-  }
-
-  animation_start_time_ = base::TimeTicks::Now();
-  animation_start_value_ = TopControlsShownRatio();
-
-  const float max_ending_ratio = (direction == SHOWING_CONTROLS ? 1 : -1);
-  animation_stop_time_ =
-      animation_start_time_ +
-      base::TimeDelta::FromMilliseconds(kShowHideMaxDurationMs);
-  animation_stop_value_ = animation_start_value_ + max_ending_ratio;
-
-  animation_direction_ = direction;
-  client_->DidChangeTopControlsPosition();
-}
-
-void TopControlsManager::StartAnimationIfNecessary() {
-  if (TopControlsShownRatio() == 0.f || TopControlsShownRatio() == 1.f)
-    return;
-
-  if (TopControlsShownRatio() >= 1.f - top_controls_hide_threshold_) {
-    // If we're showing so much that the hide threshold won't trigger, show.
-    SetupAnimation(SHOWING_CONTROLS);
-  } else if (TopControlsShownRatio() <= top_controls_show_threshold_) {
-    // If we're showing so little that the show threshold won't trigger, hide.
-    SetupAnimation(HIDING_CONTROLS);
-  } else {
-    // If we could be either showing or hiding, we determine which one to
-    // do based on whether or not the total scroll delta was moving up or
-    // down.
-    SetupAnimation(accumulated_scroll_delta_ <= 0.f ? SHOWING_CONTROLS
-                                                    : HIDING_CONTROLS);
-  }
-}
-
-bool TopControlsManager::IsAnimationComplete(float new_ratio) {
-  return (animation_direction_ == SHOWING_CONTROLS && new_ratio >= 1.f) ||
-         (animation_direction_ == HIDING_CONTROLS && new_ratio <= 0.f);
-}
-
-void TopControlsManager::ResetBaseline() {
-  accumulated_scroll_delta_ = 0.f;
-  baseline_content_offset_ = ContentOffsetInternal();
-}
-
-}  // namespace cc