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// 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/animation.h"
#include "app/animation_container.h"
#include "gfx/rect.h"
#if defined(OS_WIN)
#include "base/win_util.h"
#endif
using base::Time;
using base::TimeDelta;
Animation::Animation(int frame_rate,
AnimationDelegate* delegate)
: animating_(false),
frame_rate_(frame_rate),
timer_interval_(CalculateInterval(frame_rate)),
state_(0.0),
delegate_(delegate) {
}
Animation::Animation(int duration,
int frame_rate,
AnimationDelegate* delegate)
: animating_(false),
frame_rate_(frame_rate),
timer_interval_(CalculateInterval(frame_rate)),
duration_(TimeDelta::FromMilliseconds(duration)),
state_(0.0),
delegate_(delegate) {
SetDuration(duration);
}
Animation::~Animation() {
if (animating_)
container_->Stop(this);
}
double Animation::GetCurrentValue() const {
// Default is linear relationship, subclass to adapt.
return state_;
}
double Animation::CurrentValueBetween(double start, double target) const {
return start + (target - start) * GetCurrentValue();
}
int Animation::CurrentValueBetween(int start, int target) const {
return static_cast<int>(CurrentValueBetween(static_cast<double>(start),
static_cast<double>(target)));
}
gfx::Rect Animation::CurrentValueBetween(const gfx::Rect& start_bounds,
const gfx::Rect& target_bounds) const {
return gfx::Rect(CurrentValueBetween(start_bounds.x(), target_bounds.x()),
CurrentValueBetween(start_bounds.y(), target_bounds.y()),
CurrentValueBetween(start_bounds.width(),
target_bounds.width()),
CurrentValueBetween(start_bounds.height(),
target_bounds.height()));
}
void Animation::Start() {
if (!animating_) {
if (!container_.get())
container_ = new AnimationContainer();
animating_ = true;
container_->Start(this);
if (delegate_)
delegate_->AnimationStarted(this);
}
}
void Animation::Stop() {
if (animating_) {
animating_ = false;
// Notify the container first as the delegate may delete us.
container_->Stop(this);
if (delegate_) {
if (state_ >= 1.0)
delegate_->AnimationEnded(this);
else
delegate_->AnimationCanceled(this);
}
}
}
void Animation::End() {
if (animating_) {
animating_ = false;
// Notify the container first as the delegate may delete us.
container_->Stop(this);
AnimateToState(1.0);
if (delegate_)
delegate_->AnimationEnded(this);
}
}
bool Animation::IsAnimating() const {
return animating_;
}
void Animation::SetDuration(int duration) {
duration_ = TimeDelta::FromMilliseconds(duration);
if (duration_ < timer_interval_)
duration_ = timer_interval_;
if (animating_)
start_time_ = container_->last_tick_time();
}
// static
bool Animation::ShouldRenderRichAnimation() {
#if defined(OS_WIN)
if (win_util::GetWinVersion() >= win_util::WINVERSION_VISTA) {
BOOL result;
// Get "Turn off all unnecessary animations" value.
if (::SystemParametersInfo(SPI_GETCLIENTAREAANIMATION, 0, &result, 0)) {
// There seems to be a typo in the MSDN document (as of May 2009):
// http://msdn.microsoft.com/en-us/library/ms724947(VS.85).aspx
// The document states that the result is TRUE when animations are
// _disabled_, but in fact, it is TRUE when they are _enabled_.
return !!result;
}
}
return !::GetSystemMetrics(SM_REMOTESESSION);
#endif
return true;
}
void Animation::SetContainer(AnimationContainer* container) {
if (container == container_.get())
return;
if (animating_)
container_->Stop(this);
if (container)
container_ = container;
else
container_ = new AnimationContainer();
if (animating_)
container_->Start(this);
}
void Animation::Step(base::TimeTicks time_now) {
TimeDelta elapsed_time = time_now - start_time_;
state_ = static_cast<double>(elapsed_time.InMicroseconds()) /
static_cast<double>(duration_.InMicroseconds());
if (state_ >= 1.0)
state_ = 1.0;
AnimateToState(state_);
if (delegate_)
delegate_->AnimationProgressed(this);
if (state_ == 1.0)
Stop();
}
TimeDelta Animation::CalculateInterval(int frame_rate) {
int timer_interval = 1000000 / frame_rate;
if (timer_interval < 10000)
timer_interval = 10000;
return TimeDelta::FromMicroseconds(timer_interval);
}
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