Move animation code to new ui/base/animation directory....

app/slide_animation.cc

-// Copyright (c) 2010 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 "app/slide_animation.h"
-
-#include <math.h>
-
-// How many frames per second to target.
-static const int kDefaultFramerateHz = 50;
-
-// How long animations should take by default.
-static const int kDefaultDurationMs = 120;
-
-SlideAnimation::SlideAnimation(AnimationDelegate* target)
-    : LinearAnimation(kDefaultFramerateHz, target),
-      target_(target),
-      tween_type_(Tween::EASE_OUT),
-      showing_(false),
-      value_start_(0),
-      value_end_(0),
-      value_current_(0),
-      slide_duration_(kDefaultDurationMs) {
-}
-
-SlideAnimation::~SlideAnimation() {
-}
-
-void SlideAnimation::Reset() {
-  Reset(0);
-}
-
-void SlideAnimation::Reset(double value) {
-  Stop();
-  showing_ = static_cast<bool>(value == 1);
-  value_current_ = value;
-}
-
-void SlideAnimation::Show() {
-  // If we're already showing (or fully shown), we have nothing to do.
-  if (showing_)
-    return;
-
-  showing_ = true;
-  value_start_ = value_current_;
-  value_end_ = 1.0;
-
-  // Make sure we actually have something to do.
-  if (slide_duration_ == 0) {
-    AnimateToState(1.0);  // Skip to the end of the animation.
-    return;
-  } else if (value_current_ == value_end_)  {
-    return;
-  }
-
-  // This will also reset the currently-occuring animation.
-  SetDuration(static_cast<int>(slide_duration_ * (1 - value_current_)));
-  Start();
-}
-
-void SlideAnimation::Hide() {
-  // If we're already hiding (or hidden), we have nothing to do.
-  if (!showing_)
-    return;
-
-  showing_ = false;
-  value_start_ = value_current_;
-  value_end_ = 0.0;
-
-  // Make sure we actually have something to do.
-  if (slide_duration_ == 0) {
-    AnimateToState(0.0);  // Skip to the end of the animation.
-    return;
-  } else if (value_current_ == value_end_) {
-    return;
-  }
-
-  // This will also reset the currently-occuring animation.
-  SetDuration(static_cast<int>(slide_duration_ * value_current_));
-  Start();
-}
-
-void SlideAnimation::SetSlideDuration(int duration) {
-  slide_duration_ = duration;
-}
-
-double SlideAnimation::GetCurrentValue() const {
-  return value_current_;
-}
-
-void SlideAnimation::AnimateToState(double state) {
-  if (state > 1.0)
-    state = 1.0;
-
-  state = Tween::CalculateValue(tween_type_, state);
-
-  value_current_ = value_start_ + (value_end_ - value_start_) * state;
-
-  // Implement snapping.
-  if (tween_type_ == Tween::EASE_OUT_SNAP &&
-      fabs(value_current_ - value_end_) <= 0.06)
-    value_current_ = value_end_;
-
-  // Correct for any overshoot (while state may be capped at 1.0, let's not
-  // take any rounding error chances.
-  if ((value_end_ >= value_start_ && value_current_ > value_end_) ||
-      (value_end_ < value_start_ && value_current_ < value_end_)) {
-    value_current_ = value_end_;
-  }
-}